CN118011102A - A non-contact core resistivity measurement method and circuit under pressure-maintaining state - Google Patents
A non-contact core resistivity measurement method and circuit under pressure-maintaining state Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
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Abstract
The invention relates to the technical field of geological exploration, and particularly provides a non-contact type rock core resistivity measuring method and circuit under a pressure maintaining state. The method is realized based on a non-contact core resistivity measuring device under a pressure maintaining state, and comprises the steps that in one measuring period, a first transmitting coil and a second transmitting coil respectively transmit 2 MHz frequency point signals, a first receiving coil and a second receiving coil measure and calculate receiving signals of each time, and a transmitting module and a receiving module calculate amplitude attenuation and phase shift of corresponding reference signals; according to the phase shift P ij and the amplitude shift A ij, the phase difference between the first receiving coil and the second receiving coil is PD and the relative amplitude attenuation is AD, and when the resistivity of the rock core is measured, the method reduces the contact damage to the rock core, optimizes the structure of a rock core resistivity measuring instrument, realizes the functions of measuring the phase difference resistivity and the attenuation resistivity, and increases the practicability.
Description
Technical Field
The invention relates to the technical field of geological exploration, in particular to a non-contact type core resistivity measuring method and circuit under a pressure maintaining state.
Background
According to geological exploration or actual engineering requirements, a core-taking tool is used for taking out a cylindrical rock sample from a drilled hole, and the cylindrical rock sample is called a core. The resistivity of the core is a very important attribute, and the change characteristic of the resistivity can reflect the porosity and structural change of the rock.
Currently, the commonly used core resistivity measurement method mainly adopts an alternating current bridge method measurement or electrode probe measurement which is in direct electrical contact with the core. In actual measurement, since the outer side of the core is provided with a layer of nonmetallic liner tube, the measurement can be performed after the liner tube is perforated, and thus the in-situ sample can be directly damaged. Secondly, the electrode probes extending into and out of the method can cause the core to lose the original stable state no matter the electrochemical reaction occurs or the stress is destroyed, and the core is greatly changed from the original environment, so that scientific research work is irreversible, and great difficulty is brought to the measurement of the attribute of the core. In addition, the existing core sample resistivity measuring instrument measures traditional resistivity instead of phase difference resistivity and attenuation resistivity, and the data measured while drilling are phase difference resistivity and attenuation resistivity, so that it is difficult to directly reference and compare the data measured by the core measuring instrument with the data obtained by the while drilling logging instrument.
In the prior art, patent document CN117092169a discloses a core resistivity measuring device and method, the device comprises a liner tube for bearing a core, a plurality of coil units uniformly arranged along the outer circumference of the liner tube, a detecting system electrically connected with a unit array analog switch array, and the like, most of the core resistivity measuring devices in the prior art cannot complete resistivity test under in-situ and nondestructive conditions, and few devices with non-contact measuring function are provided, but the device also cannot directly compare equipment measurement data with resistivity measurement data without phase difference and attenuation resistivity measurement function.
Disclosure of Invention
In view of this, the invention provides a non-contact core resistivity measurement method and circuit under a pressure maintaining state, which are used for reducing the contact damage to the core when the resistivity of the core is measured, optimizing the structure of a core resistivity measurement instrument, realizing the functions of measuring the phase difference resistivity and the attenuation resistivity, and increasing the practicability.
In a first aspect, the invention provides a non-contact core resistivity measurement method under a pressure maintaining state, wherein the method is realized based on a non-contact core resistivity measurement device under the pressure maintaining state, the body of the device is cylindrical, and the material of the device is epoxy resin; a cylindrical shell made of nonmagnetic stainless steel is arranged outside the body of the device; the device comprises a body, a coil, a magnetic core, a first transmitting coil, a second transmitting coil, a first receiving coil and a second receiving coil, wherein the body is provided with 4 grooves, a coil is arranged in each groove, and the magnetic core is arranged outside the coil; a transmitting module is arranged between the first transmitting coil and the first receiving coil, and the transmitting module is connected with the first transmitting coil and the second transmitting coil; a receiving module is arranged between the second transmitting coil and the second receiving coil, and the receiving module is connected with the first receiving coil and the second receiving coil;
The method comprises the steps that in a measuring period, a first transmitting coil and a second transmitting coil respectively transmit 2 MHz MHZ frequency point signals, a first receiving coil and a second receiving coil measure and calculate receiving signals of each time, and a transmitting module and a receiving module calculate amplitude attenuation and phase shift of corresponding reference signals;
Defining the phase shift of the j-th receiving coil Rj relative to the i-th transmitting coil Ti as P ij; defining the amplitude shift of the j-th receiving coil Rj relative to the i-th transmitting coil Ti as A ij; wherein, the values of j and i are 1 or 2;
the phase difference between the first receiving coil and the second receiving coil is The formula is as follows:
；
the relative amplitude attenuation between the first receiving coil and the second receiving coil is as follows The formula is as follows:
。
Optionally, 2 groups of core fixing devices are installed on the body of the device, each group consists of 3 core fixing screws; the length of the core fixing screw rod is adjustable, and the core fixing screw rod is used for fixing the core so as to keep the core to be detected at the center of the device; the two ends of the device are respectively provided with 6 connecting holes, and bolts can be inserted into the connecting holes for connecting the body of the device with the heat-preserving and pressure-maintaining transfer device.
Optionally, the first transmitting coil, the second transmitting coil, the first receiving coil and the second receiving coil adopt symmetrical design, and the first transmitting coil and the second transmitting coil are arranged at two ends of the first receiving coil and the second receiving coil, namely, the first transmitting coil and the second transmitting coil are positioned at the outer sides of the first receiving coil and the second receiving coil.
Optionally, the transmitting module includes a transmitting driving board and a tuning board; the receiving module comprises a receiving processing board and a front placing board.
In a second aspect, the invention provides a non-contact core resistivity measurement circuit under a pressure maintaining state, which comprises a main control storage board, a collection board, a transmitting driving board, a tuning board, a receiving processing board, a front discharging board and a power board; the main control storage board is respectively connected with the acquisition board and the power supply board, and the acquisition board is respectively connected with the emission driving board and the receiving processing board; the tuning plate is connected with the emission driving plate, and the front placing plate is connected with the receiving processing plate;
the main control storage board comprises a digital signal processing DSP chip, a 1553 coding circuit, a read-out interface ROP, an auxiliary measurement circuit, a FLASH memory, a clock chip RTC and a logging tool bus LTB; the ROP interface comprises an RS485 interface and a controller area network CAN interface; the acquisition board comprises an analog-to-digital converter ADC circuit, a direct digital frequency synthesizer DDS circuit and a field programmable gate array FPGA chip.
Optionally, the main control storage board expands 1553 decoding chips and 1553 transceiver circuits according to universal asynchronous serial ports UART of the DSP chips so as to carry out 1553 communication with the computer system through the 1553 encoding circuit; the auxiliary measuring circuit is used for measuring power supply, temperature and acceleration; the DSP chip in the main control storage board is connected with the FPGA chip in the acquisition board, and the amplitude and the phase of the received signal waveform data are calculated by receiving the digitized received signal waveform data of the FPGA chip, and the FPGA chip is controlled.
Optionally, two interface channels are provided between the DSP chip and the FPGA chip, including a data address bus interface ADBUS channel and a serial peripheral interface SPI channel;
In ADBUS channels, the DSP chip maps the dual-port random access memory RAM of the FPGA chip into the RAM of the external space, after the data acquisition of the FPGA chip is finished, an external interrupt is provided for the DSP chip, and after the DSP chip receives the interrupt, the DSP chip reads data from the RAM of the FPGA chip to the internal RAM in a Direct Memory Access (DMA) mode; storing the real-time acquisition data and acquisition parameters into a FLASH memory through ADBUS channels; in the SPI channel, the FPGA chip defines a plurality of functional registers in the FPGA chip, and the DSP chip writes contents into the plurality of functional registers through the SPI channel for automatic gain control.
Optionally, an FPGA chip in the acquisition board is connected with the transmitting driving board and the receiving processing board respectively, the FPGA chip sends a channel selection signal and a transmitting signal to the transmitting driving board, the FPGA chip sends a local oscillation signal to the receiving processing board, and the local oscillation signal is processed in real time by an ADC circuit to receive the 6KHZ signal sent by the processing board.
In a third aspect, an embodiment of the present invention provides a computer readable storage medium, where the computer readable storage medium includes a stored program, where when the program runs, the apparatus where the computer readable storage medium is located is controlled to execute a method for measuring a resistivity of a core in a non-contact manner in a pressure maintaining state in the first aspect or any possible implementation manner of the first aspect.
In a fourth aspect, an embodiment of the present invention provides an electronic device, including: one or more processors; a memory; and one or more computer programs, wherein the one or more computer programs are stored in the memory, the one or more computer programs comprising instructions that, when executed by the apparatus, cause the apparatus to perform the method of non-contact core resistivity measurement under dwell conditions in the first aspect or any one of the possible implementations of the first aspect.
According to the technical scheme provided by the invention, the method is realized based on the non-contact core resistivity measuring device under the pressure maintaining state, the body of the device is cylindrical, and the material of the device is epoxy resin; a cylindrical shell made of nonmagnetic stainless steel is arranged outside the body of the device; the device comprises a body, a coil, a magnetic core, a first transmitting coil, a second transmitting coil, a first receiving coil and a second receiving coil, wherein the body is provided with 4 grooves, a coil is arranged in each groove, and the magnetic core is arranged outside the coil; a transmitting module is arranged between the first transmitting coil and the first receiving coil, and the transmitting module is connected with the first transmitting coil and the second transmitting coil; a receiving module is arranged between the second transmitting coil and the second receiving coil, and the receiving module is connected with the first receiving coil and the second receiving coil; the method comprises the steps that in a measuring period, a first transmitting coil and a second transmitting coil transmit 2 MHz frequency point signals, a first receiving coil and a second receiving coil measure and calculate receiving signals of each time, and a transmitting module and a receiving module calculate amplitude attenuation and phase shift of corresponding reference signals; defining the phase shift of the j-th receiving coil R j relative to the i-th transmitting coil T i as P ij; defining the amplitude shift of the j-th receiving coil R j relative to the i-th transmitting coil T i as a ij; wherein, the values of j and i are 1 or 2; determining the phase difference between the first receiving coil and the second receiving coil asAnd relative amplitude decayWhen the method is used for measuring the resistivity of the rock core, the contact damage to the rock core is reduced, the structure of the rock core resistivity measuring instrument is optimized, the functions of measuring the phase difference resistivity and the attenuation resistivity are realized, and the practicability is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a front view of a non-contact core resistivity measurement apparatus according to an embodiment of the present invention;
FIG. 2 is a side view of a non-contact core resistivity measurement apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a non-contact core resistivity measurement circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a main control memory board according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of an acquisition board according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of an emission driving board according to an embodiment of the present invention;
fig. 7 is a schematic circuit diagram of a tuning board according to an embodiment of the present invention;
fig. 8 is a schematic circuit diagram of a receiving processing board according to an embodiment of the present invention;
Fig. 9 is a schematic circuit diagram of an active filter according to an embodiment of the present invention;
fig. 10 is a schematic circuit diagram of a front-loading board according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of a non-contact resistivity test according to an embodiment of the present invention;
FIG. 12 is a schematic diagram of source distance-phase simulation results provided by an embodiment of the present invention;
FIG. 13 is a schematic diagram of source distance-signal strength simulation results provided by an embodiment of the present invention;
Fig. 14 is a schematic diagram of an electronic device according to an embodiment of the present invention.
In the figure: epoxy support 10, recess 11, coil 12, first transmitting coil 121, second transmitting coil 122, magnetic core 13, first receiving coil 123, second receiving coil 124, transmitting module 16, receiving module 17, core fixing screw 14, connecting hole 15.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the described embodiments are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this embodiment of the invention, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one way of describing an association of associated objects, meaning that there may be three relationships, e.g., a and/or b, which may represent: the first and second cases exist separately, and the first and second cases exist separately. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
Depending on the context, the word "if" as used herein may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection". Similarly, the phrase "if determined" or "if detected (stated condition or event)" may be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event)" or "in response to detection (stated condition or event), depending on the context.
In the prior art, patent document CN117092169a discloses a core resistivity measuring device and method, the device includes: the core resistivity measuring device comprises a liner tube for bearing a core, a plurality of coil units, a magnetic shielding barrel, grooves, a base material, an automatic core centering module, a connector, a guide block, a heat preservation module, a heat preservation barrel, a cooling pipe and a wire, wherein the coil units are uniformly arranged along the circumferential direction of the outer side of the liner tube, the grooves are formed in the inner side of the magnetic shielding barrel, the base material is arranged on the inner wall of the grooves, the core is automatically centered, the connector is connected with the magnetic shielding barrel, the guide block is connected with the magnetic shielding barrel, the heat preservation module is arranged on the heat preservation barrel, the cooling pipe is connected with the heat preservation barrel, the resistivity measuring device is mainly incapable of completing resistivity tests under in-situ and nondestructive conditions, and a few devices with non-contact measuring functions are not provided, but are also incapable of having phase difference and attenuation resistivity measuring functions, and equipment measuring data and resistivity measuring data are not capable of being directly compared.
In the embodiment of the invention, as shown in fig. 1 and 2, the method is realized based on a non-contact core resistivity measuring device in a pressure maintaining state, the body of the device is cylindrical, and the material of the device is epoxy resin; a cylindrical shell made of nonmagnetic stainless steel is arranged outside the body of the device; the device comprises a body, wherein 4 grooves 11 are formed in the body, a coil 12 is arranged in each groove 11, a magnetic core 13 is arranged outside the coil 12, and the coil 12 comprises a first transmitting coil 121, a second transmitting coil 122, a first receiving coil 123 and a second receiving coil 124; a transmitting module 16 is arranged between the first transmitting coil 121 and the first receiving coil 123, and the transmitting module 16 is connected with the first transmitting coil 121 and the second transmitting coil 122; a receiving module 17 is provided between the second transmitting coil 122 and the second receiving coil 124, and the receiving module 17 is connected to the first receiving coil 123 and the second receiving coil 124.
In the embodiment of the invention, the measuring principle of the device is that alternating current in a transmitting coil excites alternating induction current in a rock core, the intensity of the alternating induction current is proportional to the conductivity of the rock core, and the resistivity of the rock core is determined by measuring signals generated by the alternating current in the rock core in a receiving antenna.
The method comprises that in one measurement period, the first transmitting coil 121 and the second transmitting coil 122 respectively transmit 2 MHz MHZ frequency point signals, the first receiving coil 123 and the second receiving coil 124 measure and calculate the received signals of each time, and the transmitting module 16 and the receiving module 17 calculate the amplitude attenuation and the phase shift of the corresponding reference signals.
Defining the phase shift of the j-th receiving coil Rj relative to the i-th transmitting coil Ti as P ij; defining the amplitude shift of the j-th receiving coil Rj relative to the i-th transmitting coil Ti as A ij; wherein, the values of j and i are 1 or 2.
The phase difference between the first receiving coil 123 and the second receiving coil 124 isThe formula is as follows:
；
the relative amplitude attenuation between the first receiving coil 123 and the second receiving coil 124 is as follows The formula is as follows:
。
In the embodiment of the invention, 2 groups of core fixing devices are arranged on the body of the device, and each group consists of 3 core fixing screws 14; the length of the core fixing screw 14 is adjustable, and the core fixing screw is used for fixing the core so as to keep the core to be detected at the center of the device; the two ends of the device are respectively provided with 6 connecting holes 15, and bolts can be inserted into the connecting holes 15 for connecting the body of the device with the heat-preserving and pressure-maintaining transfer device.
In the embodiment of the present invention, the first transmitting coil 121, the second transmitting coil 122, the first receiving coil 123 and the second receiving coil 124 are symmetrically designed, and the first transmitting coil 121 and the second transmitting coil 122 are disposed at two ends of the first receiving coil 123 and the second receiving coil 124, that is, the first transmitting coil 121 and the second transmitting coil 122 are located at the outer sides of the first receiving coil 123 and the second receiving coil 124.
In an embodiment of the present invention, the transmitting module 16 includes a transmitting driving board and a tuning board; the receiving module 17 includes a receiving process board and a front-loading board.
In the embodiment of the invention, the center of the body of the device is hollowed for placing the core, and the rest is used as the epoxy resin bracket 10.
In the embodiment of the invention, the magnetic core 13 is made of ferrite, rubber magnet, neodymium iron boron or ceramic, and takes a cuboid shape as a main material, and can be replaced by an arc shape; the number of cores 13 may be increased or decreased as required by the actual conditions; the coil 12 can be wound in a wrapped, parallel or parallel manner, and it is necessary to explain that rectangular ferrite is selected in the invention of the embodiment, and the coil 12 is wound in a parallel manner; the number of the grooves 11 is increased or decreased according to the degree of measurement accuracy, and the number of the coils 12 is increased or decreased accordingly.
In the embodiment of the invention, the source distances of the transmitting coil and the receiving coil are equal, so that the reliability of the device is enhanced; the transmitting coil and the receiving coil are both positioned in the shell made of nonmagnetic stainless steel, so that external interference is reduced.
In the embodiment of the invention, the design, material selection and other mechanical hardware of the whole mechanical device are required to be corrosion-resistant and salt-alkali-resistant so as to meet the operation and use of offshore environment. The external connection interface can be in threaded connection, and can also be in other connection schemes such as a flange.
Fig. 3 is a schematic diagram of a non-contact core resistivity measurement circuit provided by an embodiment of the present invention, where, as shown in fig. 3, the circuit includes a main control storage board, an acquisition board, a transmitting driving board, a tuning board, a receiving processing board, a front-discharging board and a power board; the main control storage board is respectively connected with the acquisition board and the power supply board, and the acquisition board is respectively connected with the emission driving board and the receiving processing board; the tuning plate is connected with the emission driving plate, and the front placing plate is connected with the receiving processing plate.
The main control memory board comprises a digital signal Processing (DIGITAL SIGNAL Processing) chip, a 1553 coding circuit, a Read Only Port (ROP) interface, an auxiliary measurement circuit, a FLASH memory, a Clock chip (RTC) and a Logging Tool Bus (LTB); the ROP interface comprises an RS485 interface and a controller area network (Contrller Area Network, CAN) interface; the acquisition board includes Analog-to-Digital Converter (ADC) circuitry, direct digital frequency Synthesizer (DIRECT DIGITAL Synthesizer, DDS) circuitry, and field programmable gate array (Filed Programmable GATE ARRAY, FPGA) chips.
In the embodiment of the invention, a main control storage board expands a 1553 decoding chip and a 1553 transceiver circuit according to a universal asynchronous serial port (Universal Asynchronous Receiver/Transmitter) of a DSP chip so as to carry out 1553 communication with a computer system through a 1553 coding circuit; the auxiliary measuring circuit is used for measuring power supply, temperature and acceleration; the DSP chip in the main control storage board is connected with the FPGA chip in the acquisition board, the amplitude and the phase of the received signal waveform data are calculated by receiving the digitized received signal waveform data of the FPGA chip, and the FPGA chip is controlled to realize the functions of starting and stopping the device, switching the working mode, controlling the amplitude of the transmitted signal and the like.
In the embodiment of the invention, the main control storage board realizes command receiving and data sending with the computer system through the 1553 coding circuit, thereby realizing the communication function; providing ROP interfaces such as RS485, CAN and the like, and providing LTB bus functions; the auxiliary measuring circuit is used for monitoring the power supply, current, temperature, acceleration and the like in real time, and the digitization of auxiliary measuring signals is realized through an ADC measuring channel in the DSP; and the system has a data storage function, and records the collected original data, the collection parameters and the environmental parameters in real time.
In the embodiment of the present invention, as shown in fig. 4, two interface channels are provided between the DSP chip and the FPGA chip, including a data address bus interface ADBUS channel and a serial peripheral interface (SERIAL PERIPHERAL INTERFACE, SPI) channel.
In ADBUS channels, the DSP chip maps the dual-port random access memory RAM of the FPGA chip into the RAM of the external space, after the data acquisition of the FPGA chip is finished, an external interrupt is provided for the DSP chip, and after the DSP chip receives the interrupt, the DSP chip reads data from the RAM of the FPGA chip to the internal RAM in a Direct Memory Access (DMA) mode; storing the real-time acquisition data and acquisition parameters into a FLASH memory through ADBUS channels; in the SPI channel, the FPGA chip defines a plurality of functional registers in the FPGA chip, and the DSP chip writes contents into the plurality of functional registers through the SPI channel for automatic gain control.
In the embodiment of the invention, as shown in fig. 5, the acquisition board is an important component of the non-contact core resistivity measurement circuit, the FPGA chip in the acquisition board is respectively connected with the transmitting driving board and the receiving processing board, the FPGA chip sends a channel selection signal and a transmitting signal to the transmitting driving board, the FPGA chip sends a local oscillation signal to the receiving processing board, and the local oscillation signal is processed in real time by the ADC circuit to receive the 6KHZ signal sent by the processing board.
In the embodiment of the invention, the acquisition board performs AD conversion and operation processing on the signals of the receiving processing board through the ADC circuit, and calculates the phase and amplitude of the signals; generating a local oscillation signal LO and a test signal of a receiving processing board and a transmitting signal and a driving selection signal of a transmitting driving board through a DDS circuit; the emission intensity of the first emission coil 121 and the second emission coil 122 is modulated in real time according to the signal amplitude, so that automatic gain control is realized; the transmission sequence and the transmission time of the first transmission coil 121 and the second transmission coil 122 are controlled, and the transmission time sequence control is realized.
In the embodiment of the invention, the acquisition board controls a digital-to-analog converter DAC circuit, and the output amplitude of the DDS circuit is adjusted through the output voltage of the DAC circuit, so as to realize the control of the emission amplitude; the control ADC circuit is used for realizing waveform acquisition and superposition processing of signals received by the first receiving coil 123 and the second receiving coil 124 and storing processed waveform data in the internal RAM; controlling the emission time sequence, and providing related control signals to the emission driving board; controlling the DDS circuit to generate a transmitting signal of 2MHz/400kHz and a local oscillation signal of 1.995MHz/395 kHz; then, after the waveform generated by the DDS circuit is converted into a voltage signal, the voltage signal is filtered by the RLC filter circuit, and then a transmitting signal and a local oscillation signal are generated by the amplifying circuit. The RLC filter circuit has different cut-off frequencies for high frequency 2MHz and low frequency 400kHz, and the FPGA is realized by controlling the on-off of one MOS tube to change the capacitance value of the access RLC filter circuit.
In the embodiment of the invention, the transmitting driving plate is used for amplifying the power of the transmitting signal, and simultaneously realizing the switching of the transmitting channel and the on-off control of the power supply, so that only one transmitting coil can be electrified to work at the same time; the tuning plate performs resonance LC tuning on the transmission signals of 2MHz and 400kHz amplified by the power of the transmission driving plate, so that the transmission current of the transmission coil is maximum at two working frequencies; the receiving processing board performs down-conversion processing on the receiving signal from the front amplifying board by a frequency mixing and filtering method, and converts the receiving signal into an intermediate frequency signal of 6 KHZ; the front amplifying board performs primary amplification on the received signals from the first receiving coil 123 and the second receiving coil 124, and sends the amplified signals to the receiving processing board; the power panel provides proper power for other circuit modules and responds to automatic power-off control of the system; the LTB bus is provided with 28V power supply, and the input power supply is converted into voltage grades of +/-5V, +/-9V, +/-10V and the like.
In the embodiment of the invention, as shown in fig. 6, a power amplifier circuit in a transmitting driving board comprises a T1 power amplifier circuit and a T2 power amplifier circuit, each power amplifier circuit consists of a general operational amplifier and a high-power operational amplifier, the general operational amplifier realizes voltage amplification, and the high-power operational amplifier realizes current amplification; the emission driving board has 2 paths of emission driving circuits, namely PA1 and PA2 respectively. The transmitting channel selection signal firstly enters the analog switch, and then the power supply of each transmitting circuit is controlled to be on-off by controlling the switch of the MOS tube, so that only one transmitting circuit can work at the same time; the current detection circuit uses a small resistance resistor to sample and amplify the current on the power line, and enters the comparator, and once the current is overlarge, the comparator generates an overcurrent protection signal.
In the embodiment of the invention, the tuning plate has the function of enabling the transmitting coil to have the smallest impedance value under the working frequency and ensuring the largest transmitting current. As shown in fig. 7, the inductor L1, the capacitor C1 and the capacitor C2 form a double-tuning circuit, and the values of the two circuits are adjusted so that the signal of the transmitting signal is strongest at two frequencies of 2MHz and 400kHz, and the resistor R1 and the inductor L2 are equivalent circuits of the transmitting coil.
In the embodiment of the present invention, as shown in fig. 8, the main function of the receiving processing board is to perform down-conversion processing on the received signal. The receiving processing board firstly inputs the input signals IN1 and IN2 from the front amplifying board into the respective amplifying circuits X6.9 to be pre-amplified, and then controls whether the signals enter the mixer or not through the analog switch; the pre-amplified signal and the local oscillation signal are mixed by a mixer chip to generate a radio frequency and intermediate frequency mixed signal, the output signal of the mixer filters the radio frequency signal by an active filter, only the intermediate frequency signal is reserved, and the intermediate frequency signal is amplified by an amplifying circuit X1.77 and provided for a collecting and DDS board. As shown in fig. 9, the mechanism of the active filter is composed of one 1.5kHz active second-order high-pass filter and two 20kHz active second-order low-pass filters.
In the embodiment of the invention, the main function of the front-end board is to perform primary amplification on the signals of the first receiving coil 123 and the second receiving coil 124 nearby, so as to improve the signal-to-noise ratio of the signals. As shown in fig. 10, the front discharge route is composed of a receiving transformer, a 2.5V dc bias, and a two-stage X11 amplifying circuit.
FIG. 11 is a schematic diagram of a non-contact resistivity test according to an embodiment of the present invention, where, as shown in FIG. 11, a communication acquisition control box is connected to a non-contact core resistivity measuring device and a computer system, respectively; wherein the main control storage board and the acquisition board are integrated in a communication acquisition control box.
In the embodiment of the invention, the number of the transmitting coils and the receiving coils can be more than or equal to 2; the number of the core fixing screws is more than or equal to 6, namely more than or equal to 3 in each circle.
In the embodiment of the invention, the simulation results of the invention are all selected from the frequency of 2 megahertz (Mhz) and the interval of 11 inches (in) as boundary conditions, and as shown in figures 12 and 13, the conductivities are respectively 90 meters per second (S/m), 50S/m and 10S/m, and the core resistivity can be clearly calculated according to the existing experimental results. Simulation results show that the signal intensity and the phase change are obviously changed along with the change of the source distance on the premise that the selected emission frequency is 2Mhz and the distance is 11in, the numerical requirement meets the detection requirement, and the instrument can be used for detecting core samples. Other frequencies of 1Mhz, 400Khz, 200Khz and the like, and other intervals of 12in, 8in, 6in and the like also meet the requirements of core sample detection.
According to the embodiment of the invention, the rock core resistivity measuring device detects the resistivity of the sample in a non-contact manner under the condition of ensuring the pressure of the rock core sample, and realizes the non-contact resistivity measurement by butting a large number of existing heat-preservation pressure-maintaining transfer devices.
In the embodiment of the invention, the device has novel structural design, solves the problems that the conventional resistivity detection needs to pollute a sample core and is not matched with a logging curve, makes up the blank of China in the aspect of non-contact measurement of the core sample, and contributes to accurate data required by scientific researchers; the measurement result of the instrument can be displayed on a computer in real time through the cooperation of software, and complex calculation is not needed; related information such as resistivity, saturation, permeability and the like can be directly obtained; the coil structure is optimized, the installation difficulty is reduced, and the processing cost is saved; according to the detection and evaluation requirements, new parameters such as the number of antennas, source distance, frequency and the like can be developed in the later period so as to adapt to the requirements; the device has simple structure and convenient field operation, can be used for detection on ships after relevant sealing and corrosion prevention are finished, and is a core sample electromagnetic wave resistivity device with practicability and economy; the phase difference and the attenuation resistivity can be carried out, and the measured data of the core measuring instrument and the data obtained by the logging while drilling instrument are directly compared in a reference manner, so that the blank of the related field is made up.
Various steps of embodiments of the present invention may be performed by an electronic device. Electronic devices include, but are not limited to, cell phones, tablet computers, portable PCs, desktops, and the like.
According to the technical scheme provided by the invention, the method is realized based on the non-contact core resistivity measuring device under the pressure maintaining state, the body of the device is cylindrical, and the material of the device is epoxy resin; a cylindrical shell made of nonmagnetic stainless steel is arranged outside the body of the device; the device comprises a body, a coil, a magnetic core, a first transmitting coil, a second transmitting coil, a first receiving coil and a second receiving coil, wherein the body is provided with 4 grooves, a coil is arranged in each groove, and the magnetic core is arranged outside the coil; a transmitting module is arranged between the first transmitting coil and the first receiving coil, and the transmitting module is connected with the first transmitting coil and the second transmitting coil; a receiving module is arranged between the second transmitting coil and the second receiving coil, and the receiving module is connected with the first receiving coil and the second receiving coil; the method comprises the steps that in a measuring period, a first transmitting coil and a second transmitting coil transmit 2 MHz frequency point signals, a first receiving coil and a second receiving coil measure and calculate receiving signals of each time, and a transmitting module E1 and a receiving module E2 calculate amplitude attenuation and phase shift of corresponding reference signals; defining the phase shift of the j-th receiving coil R j relative to the i-th transmitting coil T i as P ij; defining the amplitude shift of the j-th receiving coil R j relative to the i-th transmitting coil T i as a ij; wherein, the values of j and i are 1 or 2; determining the phase difference between the first receiving coil and the second receiving coil asAnd relative amplitude decayWhen the method is used for measuring the resistivity of the rock core, the contact damage to the rock core is reduced, the structure of the rock core resistivity measuring instrument is optimized, the functions of measuring the phase difference resistivity and the attenuation resistivity are realized, and the practicability is improved.
The embodiment of the invention provides a computer readable storage medium, which comprises a stored program, wherein when the program runs, an electronic device in which the computer readable storage medium is positioned is controlled to execute the embodiment of the non-contact core resistivity measurement method under the pressure maintaining state.
Fig. 14 is a schematic diagram of an electronic device according to an embodiment of the present invention, as shown in fig. 14, an electronic device 71 includes: the processor 711, the memory 712, and the computer program 713 stored in the memory 712 and executable on the processor 711, wherein the computer program 713 when executed by the processor 711 implements the method for measuring the resistivity of the core in the pressure maintaining state in the embodiment, and is not described herein in detail for avoiding repetition.
The electronic device 71 includes, but is not limited to, a processor 711, a memory 712. It will be appreciated by those skilled in the art that fig. 14 is merely an example of an electronic device 71 and is not meant to be limiting of the electronic device 71, and may include more or fewer components than shown, or may combine certain components, or different components, e.g., an electronic device may also include an input-output device, a network access device, a bus, etc.
The Processor 711 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (DIGITAL SIGNAL Processor, DSP), application SPECIFIC INTEGRATED Circuit (ASIC), field-Programmable gate array (Field-Programmable GATE ARRAY, FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 712 may be an internal storage unit of the electronic device 71, such as a hard disk or a memory of the electronic device 71. The memory 712 may also be an external storage device of the electronic device 71, such as a plug-in hard disk provided on the electronic device 71, a smart memory card (SMART MEDIA CARD, SMC), a Secure Digital (SD) card, a flash memory card (FLASH CARD), or the like. Further, the memory 712 may also include both internal and external storage units of the electronic device 71. The memory 712 is used to store computer programs and other programs and data required by the network device. The memory 712 may also be used to temporarily store data that has been output or is to be output.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.
Claims (10)
1. The non-contact type core resistivity measuring method is characterized in that the method is realized based on a non-contact type core resistivity measuring device under the pressure maintaining state, the body of the device is cylindrical, and the material of the device is epoxy resin; a cylindrical shell made of nonmagnetic stainless steel is arranged outside the body of the device; the device comprises a body, wherein 4 grooves (11) are formed in the body, a coil (12) is arranged in each groove (11), a magnetic core (13) is arranged outside the coil (12), and the coil (12) comprises a first transmitting coil (121), a second transmitting coil (122), a first receiving coil (123) and a second receiving coil (124); a transmitting module (16) is arranged between the first transmitting coil (121) and the first receiving coil (123), and the transmitting module (16) is connected with the first transmitting coil (121) and the second transmitting coil (122); a receiving module (17) is arranged between the second transmitting coil (122) and the second receiving coil (124), and the receiving module (17) is connected with the first receiving coil (123) and the second receiving coil (124);
The method comprises the steps that in one measurement period, a first transmitting coil (121) and a second transmitting coil (122) respectively transmit 2 MHz MHZ frequency point signals, a first receiving coil (123) and a second receiving coil (124) measure and calculate received signals of each time, and a transmitting module (16) and a receiving module (17) calculate amplitude attenuation and phase shift of corresponding reference signals;
Defining the phase shift of the j-th receiving coil Rj relative to the i-th transmitting coil Ti as P ij; defining the amplitude shift of the j-th receiving coil Rj relative to the i-th transmitting coil Ti as A ij; wherein, the values of j and i are 1 or 2;
The phase difference between the first receiving coil (123) and the second receiving coil (124) is The formula is as follows:
；
The relative amplitude between the first receiving coil (123) and the second receiving coil (124) is attenuated to be The formula is as follows:
。
2. The non-contact core resistivity measurement method under the pressure maintaining state according to claim 1, wherein 2 groups of core fixing devices are installed on the body of the device, each group consisting of 3 core fixing screws (14); the length of the core fixing screw (14) is adjustable, and the core fixing screw is used for fixing the core so as to keep the core to be detected at the center of the device; and 6 connecting holes (15) are respectively formed at two ends of the device, and bolts can be inserted into the connecting holes (15) and used for connecting the body of the device with the heat-preserving and pressure-maintaining transfer device.
3. The method for measuring the resistivity of the core under the pressure maintaining state according to claim 1, wherein the first transmitting coil (121), the second transmitting coil (122), the first receiving coil (123) and the second receiving coil (124) are symmetrically designed, and the first transmitting coil (121) and the second transmitting coil (122) are arranged at two ends of the first receiving coil (123) and the second receiving coil (124), namely, the first transmitting coil (121) and the second transmitting coil (122) are positioned at the outer sides of the first receiving coil (123) and the second receiving coil (124).
4. The non-contact core resistivity measurement method under dwell conditions according to claim 1, wherein the firing module (16) includes a firing drive plate and a tuning plate; the receiving module (17) comprises a receiving processing plate and a front plate.
5. The non-contact rock core resistivity measuring circuit is characterized by comprising a main control storage board, an acquisition board, a transmitting driving board, a tuning board, a receiving processing board, a front discharging board and a power board; the main control storage board is respectively connected with the acquisition board and the power supply board, and the acquisition board is respectively connected with the emission driving board and the receiving processing board; the tuning plate is connected with the emission driving plate, and the front placing plate is connected with the receiving processing plate;
the main control storage board comprises a digital signal processing DSP chip, a 1553 coding circuit, a read-out interface ROP, an auxiliary measurement circuit, a FLASH memory, a clock chip RTC and a logging tool bus LTB; the ROP interface comprises an RS485 interface and a controller area network CAN interface; the acquisition board comprises an analog-to-digital converter ADC circuit, a direct digital frequency synthesizer DDS circuit and a field programmable gate array FPGA chip.
6. The non-contact core resistivity measurement circuit under pressure maintaining according to claim 5, wherein the main control memory board expands 1553 decoding chips and 1553 transceiver circuits according to universal asynchronous serial port UART of the DSP chips to communicate 1553 with the computer system through the 1553 encoding circuit; the auxiliary measuring circuit is used for measuring power supply, temperature and acceleration; the DSP chip in the main control storage board is connected with the FPGA chip in the acquisition board, and the amplitude and the phase of the received signal waveform data are calculated by receiving the digitized received signal waveform data of the FPGA chip, and the FPGA chip is controlled.
7. The non-contact core resistivity measurement circuit under pressure maintaining according to claim 6, wherein two interface channels are provided between the DSP chip and the FPGA chip, including a data address bus interface ADBUS channel and a serial peripheral interface SPI channel;
In ADBUS channels, the DSP chip maps the dual-port random access memory RAM of the FPGA chip into the RAM of the external space, after the data acquisition of the FPGA chip is finished, an external interrupt is provided for the DSP chip, and after the DSP chip receives the interrupt, the DSP chip reads data from the RAM of the FPGA chip to the internal RAM in a Direct Memory Access (DMA) mode; storing the real-time acquisition data and acquisition parameters into a FLASH memory through ADBUS channels; in the SPI channel, the FPGA chip defines a plurality of functional registers in the FPGA chip, and the DSP chip writes contents into the plurality of functional registers through the SPI channel for automatic gain control.
8. The non-contact core resistivity measurement circuit in a pressure maintaining state according to claim 5, wherein an FPGA chip in the acquisition board is connected with the transmitting driving board and the receiving processing board respectively, the FPGA chip sends a channel selection signal and a transmitting signal to the transmitting driving board, the FPGA chip sends a local oscillation signal to the receiving processing board, and the receiving processing board sends a 6KHZ signal in real time through the ADC circuit.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a stored program, wherein the program, when run, controls a device in which the computer-readable storage medium is located to perform the method for measuring the resistivity of the core in a pressure maintaining state according to any one of claims 1 to 4.
10. An electronic device, comprising: one or more processors; a memory; and one or more computer programs, wherein the one or more computer programs are stored in the memory, the one or more computer programs comprising instructions that, when executed by the apparatus, cause the apparatus to perform the method of contactless core resistivity measurement under dwell conditions of any one of claims 1 to 4.
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