CN116411937A - A logging tool, casing and method for measuring production casing cementing quality through tubing - Google Patents

Abstract

The invention relates to a well logging tool, a casing and a method for measuring the cementing quality of the production casing through the tubing. The logging tool includes an electromagnetic ultrasonic transmitter, an electromagnetic ultrasonic receiver and a driving part. One end of the transmitter, the driving end of which is fixedly connected with the electromagnetic ultrasonic transmitter, and is used to drive the electromagnetic ultrasonic transmitter to rotate. The core of the invention is based on the electromagnetic ultrasonic logging tool, which directly excites and receives ultrasonic signals in the oil pipe, avoiding the huge interface loss of the signal propagating from gas to solid. The invention can solve the technical problem that the excited ultrasonic waves cannot effectively pass through the gas-solid interface, so the casing cementing quality cannot be measured through the tubing, and realize the production casing cementing quality of old wells and in-service wells to be evaluated for gas storage construction The oil pipe measurement provides technical support for the efficient construction and safe operation of the gas storage.

Description

A logging tool, casing and method for measuring production casing cementing quality through tubing

technical field

The invention relates to the technical field of gas storage old well treatment, in particular to a logging tool, casing and a method for measuring the cementing quality of the production casing through the oil pipe.

Background technique

The efficient construction and safe operation of gas storage is an important prerequisite for ensuring the strategic reserve of natural gas resources and seasonal peak regulation in my country. In the process of gas storage construction, making full use of old wells as injection-production wells or monitoring wells is an effective way to reduce the cost of gas storage construction, but the premise that these old wells can be used is that their cementing quality must meet the requirements of the gas storage . At present, for old wells with complete completion strings, the evaluation of the cementing quality can only be judged by the original logging data. The current cementing quality cannot be re-evaluated by effective means. The reason is that The current ultrasonic logging technology cannot realize the measurement through the tubing. Because it is impossible to grasp the current cementing quality of these old wells, it is impossible to accurately judge the treatment methods of these old wells, that is, whether they should be plugged or whether they can be reused lacks the necessary judgment basis. At the same time, there is also such a problem with the gas storage wells in service. After the gas storage wells have been in operation for a relatively long time, the cementing quality of the gas storage wells, that is, the cementation degree of the production casing cement sheath, may occur under the action of alternating stress. Therefore, it is also necessary to measure the cementing quality of the production casing, and then evaluate the current cement sheath cementation situation.

The current ultrasonic logging technology is liquid coupling, that is, to excite the ultrasonic signal in the liquid, make it transmit through the liquid-solid interface, and then receive the echo signal to judge the cementing quality of the casing, but if the logging tool is in the The oil pipe is lowered, and the oil pipe is filled with high-pressure gas. Conventional logging tools do not have the ability of air coupling, and the ultrasonic transducer can only excite ultrasonic signals in the air, and the excited ultrasonic waves cannot effectively pass through the gas-solid interface. , so the casing cementing quality cannot be measured through the tubing. In view of the above needs and technical status, it is urgent to explore a new method and technology that can realize the quality of casing cementing through the tubing.

Contents of the invention

The technical problem to be solved by the present invention is to provide a logging tool, a casing and a method for measuring the cementing quality of the production casing through the tubing, aiming at solving the problems in the prior art.

The technical scheme that the present invention solves the problems of the technologies described above is as follows:

A well logging tool, comprising an electromagnetic ultrasonic transmitter, an electromagnetic ultrasonic receiver and a driving part, the driving part is fixedly installed at one end of the electromagnetic ultrasonic receiver, and its driving end is fixedly connected with the electromagnetic ultrasonic transmitter. to drive the electromagnetic ultrasonic transmitter to rotate.

The beneficial effects of the present invention are: during detection, the ultrasonic signal is directly excited in the tubing through the electromagnetic ultrasonic transmitter, and the ultrasonic signal generated in the tubing passes through the tubing-annulus protection fluid interface, propagates into the annulus protection fluid, and then transmits After passing through the annulus protection fluid-casing interface and entering the cement sheath-casing interface, the ultrasonic signal will form a guided wave in the casing, which carries information about the cement sheath cementation. The protective fluid spreads into the tubing, and then the electromagnetic ultrasonic receiving transducer at the receiving end captures the signal, and finally processes the captured signal to obtain the casing cementing quality data, and then check the cementing quality and cement sheath cementation. The situation is evaluated.

The core of the present invention is based on the electromagnetic ultrasonic logging tool, which directly excites and receives ultrasonic signals in the tubing, avoiding the huge interface loss of signals propagating from gas to solid. The invention can solve the technical problem that the excited ultrasonic waves cannot effectively pass through the gas-solid interface, so the casing cementing quality cannot be measured through the tubing, and realize the production casing cementing quality of old wells and in-service wells to be evaluated for gas storage construction The oil pipe measurement provides technical support for the efficient construction and safe operation of the gas storage.

On the basis of the above technical solutions, the present invention can also be improved as follows.

Further, the electromagnetic ultrasonic receiver includes an electromagnetic ultrasonic signal receiving sub-joint and a plurality of electromagnetic ultrasonic receiving transducers, and a plurality of the electromagnetic ultrasonic receiving transducers are evenly spaced and fixedly installed on the electromagnetic ultrasonic signal receiving sub-joint ; The driving member is fixedly installed on one end of the electromagnetic ultrasonic signal receiving short joint.

The beneficial effect of adopting the above further solution is that during detection, multiple electromagnetic ultrasonic receiving transducers are used to capture signals, so that the capture efficiency is higher and the detection efficiency is higher.

Further, the electromagnetic ultrasonic signal receiving sub-joint has a cylindrical structure, and a plurality of the electromagnetic ultrasonic receiving transducers are divided into multiple groups and are evenly spaced along the axial direction of the electromagnetic ultrasonic signal receiving sub-joint, and each group A plurality of the electromagnetic ultrasonic receiving transducers are evenly spaced along the circumference of the electromagnetic ultrasonic signal receiving sub-joint.

The beneficial effect of adopting the above further solution is that the structure is simple, the design is reasonable, the multiple electromagnetic ultrasonic receiving transducers are reasonably distributed, the ultrasonic signals can be captured faster and more accurately, and the detection efficiency is higher.

Further, it also includes a signal receiving transmitter, a plurality of the electromagnetic ultrasonic receiving transducers are respectively connected in communication with the signal receiving transmitter, and the signal receiving transmitter is used to control the electromagnetic ultrasonic transmitter to send out ultrasonic signals, and use It is used to receive and process and store the signals sent by a plurality of electromagnetic ultrasonic receiving transducers, and is also used to send the processed signals to the receiving terminal.

The beneficial effect of adopting the above-mentioned further scheme is that when detecting, first the signal receiving transmitter controls the electromagnetic ultrasonic transmitter to send ultrasonic signals, and then the ultrasonic signals captured by a plurality of electromagnetic ultrasonic receiving transducers are sent to the signal receiving transmitter, and the signals are received and transmitted The receiver receives and processes it, and at the same time sends the processed signal to the receiving terminal, which is convenient for processing.

Further, the signal receiving and transmitting device includes a communication remote transmission sub-section, a signal amplification and storage unit, a signal transmitting and receiving control unit connected in sequence, and the electromagnetic ultrasonic transmitter and a plurality of the electromagnetic ultrasonic receiving transducers are respectively The signal transmitting and receiving control unit is connected in communication, and the communication teletransmission sub-section is used to communicate in connection with the receiving terminal.

The beneficial effect of adopting the above-mentioned further scheme is that during detection, the electromagnetic ultrasonic transmitter is controlled by the signal emission and receiving control unit to excite the ultrasonic signal, and at the same time, the signals sent back by a plurality of electromagnetic ultrasonic receiving transducers can be received, processed and analyzed, and then passed The communication remote transmission nipple sends the processed signal to the receiving terminal to obtain the casing cementing quality data, and then complete the evaluation of its cementing quality and cement sheath cementation.

Further, the communication remote transmission sub-section, the signal amplification and storage unit, the signal transmission and reception control unit and the electromagnetic ultrasonic signal receiving sub-section are fixedly connected in sequence, and the communication remote transmission sub-section is connected to one end of the cable connected, and the other end of the cable is used to connect to the receiving terminal.

The beneficial effect of adopting the above-mentioned further solution is that the structure is simple and the design is reasonable, and the connection between the communication remote transmission sub-section and the receiving terminal is realized through the cable, and the rapid transmission of signals is realized.

Further, the electromagnetic ultrasonic transmitter is an electromagnetic ultrasonic transmitting transducer.

The beneficial effect of adopting the above further solution is that the electromagnetic ultrasonic transmitting transducer has the advantages of large penetration depth, high resolution, good directivity and no radiation hazard.

The present invention also relates to a casing, including a casing body and the logging tool as described above, the casing body is fixed vertically, and a cement sheath surrounds the outside; the electromagnetic ultrasonic transmitter, the electromagnetic ultrasonic The receiver and the driving member are respectively located in the bushing body.

The beneficial effect of adopting the above further solution is that the core of the present invention is based on the electromagnetic ultrasonic logging tool, which directly excites and receives ultrasonic signals in the tubing, avoiding the huge interface loss of signals propagating from gas to solid. The invention can solve the technical problem that the excited ultrasonic waves cannot effectively pass through the gas-solid interface, so the casing cementing quality cannot be measured through the tubing, and realize the production casing cementing quality of old wells and in-service wells to be evaluated for gas storage construction The oil pipe measurement provides technical support for the efficient construction and safe operation of the gas storage.

Further, an oil pipe is vertically fixedly installed inside the casing body, and a closed protection chamber is formed between the oil pipe and the casing body, and the protection chamber is filled with annular protection liquid; the electromagnetic ultrasonic The transmitter, the electromagnetic ultrasonic receiver and the driving part are respectively located in the oil pipe.

The beneficial effect of adopting the above further scheme is that the structure is simple and the design is reasonable. The purpose of setting the annulus protection fluid is to protect the casing from corrosion and the downhole packer can be pulled out safely; Or the reservoir pressure that the packer bears, and can reduce the pressure difference between the tubing and the annulus, while inhibiting the corrosion tendency of the tubing and casing.

The present invention also relates to a method for measuring the cementing quality of the production casing through the oil pipe, which uses the above-mentioned casing to measure, and includes the following specific steps:

S1: the driving part drives the electromagnetic ultrasonic transmitter to rotate, and at the same time, the electromagnetic ultrasonic transmitter excites an ultrasonic signal;

S2: The ultrasonic signal propagates to the interface of the cement sheath, and a guided wave is excited in the casing, and the guided wave carries the cement sheath cementation information;

S3: the guided wave is captured by the electromagnetic ultrasonic receiver;

S4: The electromagnetic ultrasonic receiver propagates the guided wave to the receiving terminal, and the receiving terminal processes and analyzes the information carried by the guided wave, and finally obtains the casing cementing quality information.

The beneficial effect of adopting the above further solution is that the core of the present invention is based on the electromagnetic ultrasonic logging tool, which directly excites and receives ultrasonic signals in the tubing, avoiding the huge interface loss of signals propagating from gas to solid. The invention can solve the technical problem that the excited ultrasonic waves cannot effectively pass through the gas-solid interface, so the casing cementing quality cannot be measured through the tubing, and realize the production casing cementing quality of old wells and in-service wells to be evaluated for gas storage construction The oil pipe measurement provides technical support for the efficient construction and safe operation of the gas storage.

Description of drawings

Fig. 1 is the schematic diagram that the electromagnetic ultrasonic logging tool of the present invention realizes the production casing cementing quality through the tubing;

Fig. 2 is a schematic diagram of the electromagnetic ultrasonic transducer of the present invention directly exciting the ultrasonic signal in the tubing body;

Fig. 3 is a comparative analysis diagram of the ultrasonic signal received in the oil pipe body and the ultrasonic signal received in the high-pressure gas inside the oil pipe according to the present invention.

In the accompanying drawings, the list of parts represented by each label is as follows:

1. Cable; 2. Communication remote transmission sub; 3. Signal amplification and storage unit; 4. Signal transmission and receiving control unit; 5. Electromagnetic ultrasonic signal receiving sub; 6. Electromagnetic ultrasonic receiving transducer; 7. Electromagnetic Ultrasonic transmitting transducer; 8. Cement sheath; 9. Casing body; 10. Annular space protection fluid; 11. Oil pipe; 12. Ultrasonic signal; 13. Channeling channel caused by cement sheath cement failure; 14. Driving parts; 15 , Magnetic substances.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, a feature defined as "first", "second", etc. may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention based on specific situations.

The present invention will be described in detail below with reference to the accompanying drawings and examples.

Example 1

As shown in Figures 1 to 3, this embodiment provides a logging tool, including an electromagnetic ultrasonic transmitter, an electromagnetic ultrasonic receiver, and a driver 14, and the driver 14 is fixedly installed at one end of the electromagnetic ultrasonic receiver , the driving end of which is fixedly connected with the electromagnetic ultrasonic transmitter, and is used to drive the electromagnetic ultrasonic transmitter to rotate.

During detection, the ultrasonic signal is directly excited in the tubing through the electromagnetic ultrasonic transmitter, and the ultrasonic signal 12 generated in the tubing passes through the tubing-annulus protection fluid interface, propagates into the annulus protection fluid, and then transmits through the annulus protection fluid- The casing interface enters the cement sheath-casing cement interface, and the ultrasonic signal will form a guided wave in the casing, which carries the information of the cement sheath cementation, and the guided wave signal is transmitted to the tubing through the annular protection fluid , and then the electromagnetic ultrasonic receiving transducer at the receiving end captures the signal, and finally processes the captured signal to obtain the casing cementing quality data, and then completes the evaluation of its cementing quality and cement sheath cementation.

Preferably, in this embodiment, the above-mentioned driving member 14 can drive the electromagnetic ultrasonic transmitter to realize 360° rotation.

Since the specific location of the channel 13 caused by the failure of cement sheath cementation is not clear before the detection, the electromagnetic ultrasonic transmitter will be rotated 360° during the whole process of lowering the logging tool, so as to accurately detect the occurrence of cement sheath cementation failure. The specific position of the channeling channel 13 is convenient to detect.

The core of this embodiment is based on the electromagnetic ultrasonic logging tool, which directly excites and receives ultrasonic signals in the tubing, avoiding the huge interface loss of signals propagating from gas to solid. The invention can solve the technical problem that the excited ultrasonic waves cannot effectively pass through the gas-solid interface, so the casing cementing quality cannot be measured through the tubing, and realize the production casing cementing quality of old wells and in-service wells to be evaluated for gas storage construction The oil pipe measurement provides technical support for the efficient construction and safe operation of the gas storage.

Example 2

On the basis of Embodiment 1, in this embodiment, the electromagnetic ultrasonic receiver includes an electromagnetic ultrasonic signal receiving sub-joint 5 and a plurality of electromagnetic ultrasonic receiving transducers 6, and a plurality of electromagnetic ultrasonic receiving transducers 6 are uniform The intervals are fixedly installed on the electromagnetic ultrasonic signal receiving short joint 5 ; the driving member 14 is fixedly installed on one end of the electromagnetic ultrasonic signal receiving short joint 5 .

During detection, multiple electromagnetic ultrasonic receiving transducers 6 are used to capture signals, so the capture efficiency is higher and the detection efficiency is higher.

Preferably, in this embodiment, the driving member 14 is preferably a motor, and the motor is fixedly installed on one end of the electromagnetic ultrasonic signal receiving short joint 5 .

Example 3

On the basis of Embodiment 2, in this embodiment, the electromagnetic ultrasonic signal receiving short joint 5 has a cylindrical structure, and a plurality of the electromagnetic ultrasonic receiving transducers 6 are divided into multiple groups and The receiving short joints 5 are evenly spaced in the axial direction, and a plurality of electromagnetic ultrasonic receiving transducers 6 in each group are evenly spaced along the circumference of the electromagnetic ultrasonic signal receiving short joints 5 .

The solution has a simple structure and a reasonable design, and the plurality of electromagnetic ultrasonic receiving transducers 6 are reasonably distributed, so that ultrasonic signals can be captured faster and more accurately, and the detection efficiency is higher.

Example 4

On the basis of any one of Embodiment 2 to Embodiment 3, this embodiment also includes a signal receiving transmitter, and a plurality of the electromagnetic ultrasonic receiving transducers 6 are respectively connected in communication with the signal receiving transmitter, and the signal The receiving transmitter is used to control the electromagnetic ultrasonic transmitter to send ultrasonic signals, and is used to receive and process and store the signals sent by a plurality of the electromagnetic ultrasonic receiving transducers 6, and is also used to send the processed signals to the receiver terminal.

During detection, first the signal receiving transmitter controls the electromagnetic ultrasonic transmitter to send ultrasonic signals, and then the ultrasonic signals captured by a plurality of electromagnetic ultrasonic receiving transducers 6 are sent to the signal receiving transmitter, received and processed by the signal receiving transmitter, and simultaneously The processed signal is sent to the receiving terminal, which is convenient for processing.

Example 5

On the basis of Embodiment 4, in this embodiment, the signal receiving transmitter includes a communication remote transmission sub-section 2, a signal amplification and storage unit 3, a signal transmission and reception control unit 4, and an electromagnetic ultrasonic transmitter connected in sequence. The signal transmitting and receiving control unit 4 is communicatively connected with a plurality of electromagnetic ultrasonic receiving transducers 6 , and the communication remote transmission sub-section 2 is used for communicating with the receiving terminal.

During detection, the electromagnetic ultrasonic transmitter is controlled by the signal transmitting and receiving control unit 4 to excite ultrasonic signals, and at the same time, the signals sent back by multiple electromagnetic ultrasonic receiving transducers 6 can be received, processed and analyzed and stored in the signal amplification and storage unit 3 Then, the processed signal is sent to the receiving terminal through the communication remote transmission nipple 2, and the casing cementing quality data can be obtained, and then the cementing quality and cement sheath cementation can be evaluated.

It should be noted that the above-mentioned communication remote transmission sub-section 2 , signal amplification and storage unit 3 and signal transmission and reception control unit 4 all adopt the prior art.

Preferably, in this embodiment, the entire logging tool is in a cylindrical structure, and its shape matches the shape of the tubing, making detection more convenient.

Example 6

On the basis of Embodiment 5, in this embodiment, the communication remote transmission sub-section 2, the signal amplification and storage unit 3, the signal transmitting and receiving control unit 4 and the electromagnetic ultrasonic signal receiving sub-section 5 The connections are fixed sequentially, the communication remote transmission sub-section 2 is connected to one end of the cable 1, and the other end of the cable 1 is used to connect to the receiving terminal.

The scheme is simple in structure and reasonable in design, and realizes the connection between the communication remote transmission sub-section 2 and the receiving terminal through the cable 1, so as to realize the rapid transmission of signals.

Example 7

On the basis of the above-mentioned embodiments, in this embodiment, the electromagnetic ultrasonic transmitter is an electromagnetic ultrasonic transmitting transducer 7 .

The above-mentioned electromagnetic ultrasonic transmitting transducer 7 has the advantages of large penetration depth, high resolution, good directivity and no radiation hazard.

Based on the above solution, the above-mentioned electromagnetic ultrasonic transmitting transducer 7 is fixedly installed on the driving end of the motor.

In addition, the motor transmits and receives signals to and from the control unit 4 through wires.

It should be noted that the cable 1 is connected to the receiving terminal, which can not only realize signal transmission, but also supply power to various devices through the cable 1 .

In addition, the above-mentioned electromagnetic ultrasonic transmitting transducer 7 and multiple electromagnetic ultrasonic receiving transducers 6 respectively adopt the prior art, and their specific structures and principles will not be repeated here.

Example 8

On the basis of the above-mentioned embodiments, this embodiment also provides a casing, which includes a casing body 9 and the logging tool as described above. The casing body 9 is vertically fixed and surrounded by a cement sheath 8; the electromagnetic ultrasonic transmitter, the electromagnetic ultrasonic receiver and the driving member 14 are respectively located in the casing body 9 .

The core of this embodiment is based on the electromagnetic ultrasonic logging tool, which directly excites and receives ultrasonic signals in the tubing, avoiding the huge interface loss of signals propagating from gas to solid. The invention can solve the technical problem that the excited ultrasonic waves cannot effectively pass through the gas-solid interface, so the casing cementing quality cannot be measured through the tubing, and realize the production casing cementing quality of old wells and in-service wells to be evaluated for gas storage construction The oil pipe measurement provides technical support for the efficient construction and safe operation of the gas storage.

Example 9

On the basis of Embodiment 8, in this embodiment, an oil pipe 11 is vertically and fixedly installed inside the casing body 9, and a closed protection chamber is formed between the oil pipe 11 and the casing body 9, so The protection cavity is filled with an annular protection fluid 10; the electromagnetic ultrasonic transmitter, the electromagnetic ultrasonic receiver and the driving member 14 are respectively located in the oil pipe 11.

The scheme is simple in structure and reasonable in design. The annulus protection fluid 10 is set to protect the casing from corrosion and the downhole packer can be pulled out safely; It can reduce the pressure difference between tubing and annulus, and suppress the corrosion tendency of tubing and casing at the same time.

Preferably, in this embodiment, the casing body 9 and the oil pipe 11 respectively adopt a circular tubular structure, and the two are coaxially sleeved.

In addition, electromagnetic ultrasound uses the permanent magnet inside the transducer to cooperate with the alternating current electromagnet, and through the action of magnetostriction and Lorentz force, the magnetic substance 15 in the magnetic object such as oil pipe is driven to vibrate magnetically. The regular vibration of the substance 15 induces an ultrasonic signal 12 to be generated in the oil pipe 11 . Similarly, when there is an ultrasonic signal in the oil pipe 11 , it will excite the magnetic substance 15 inside to vibrate, and then generate an induced current in the electromagnetic coil, that is, capture the ultrasonic signal in the oil pipe 11 .

Example 10

On the basis of the above-mentioned embodiments, this embodiment also provides a method for measuring the cementing quality of the production casing through the tubing, using the above-mentioned casing for measurement, including the following specific steps:

S1: the driving part 14 drives the electromagnetic ultrasonic transmitter to rotate, and at the same time, the electromagnetic ultrasonic transmitter excites an ultrasonic signal;

S2: The ultrasonic signal propagates to the cement sheath-casing interface, and a guided wave is excited in the casing, and the guided wave carries the cement sheath cementation information;

S3: The guided wave propagates into the oil pipe in the casing and is captured by the electromagnetic ultrasonic receiver;

S4: The electromagnetic ultrasonic receiver propagates the guided wave to the receiving terminal, and the receiving terminal processes and analyzes the information carried by the guided wave, and finally obtains the casing cementing quality information.

The core of this embodiment is based on the electromagnetic ultrasonic logging tool, which directly excites and receives ultrasonic signals in the tubing, avoiding the huge interface loss of signals propagating from gas to solid. The invention can solve the technical problem that the excited ultrasonic waves cannot effectively pass through the gas-solid interface, so the casing cementing quality cannot be measured through the tubing, and realize the production casing cementing quality of old wells and in-service wells to be evaluated for gas storage construction The oil pipe measurement provides technical support for the efficient construction and safe operation of the gas storage.

The working principle of the present invention is as follows:

Step 1. Drive the electromagnetic ultrasonic transmitting transducer 7 to rotate through the motor, and the electromagnetic ultrasonic transmitting transducer 7 directly excites the ultrasonic signal in the oil pipe;

Step 2, the ultrasonic signal propagates through the annulus protection fluid to reach the cement sheath-casing interface;

Step 3. A guided wave is excited in the casing, and the guided wave carries the cement sheath cementation information;

Step 4, the guided wave scatters into the annular space protection fluid, propagates into the tubing body again, and is captured by a plurality of electromagnetic ultrasonic receiving transducers 6;

Step 5. The guided echo signal is processed by the signal method, transmitted to the ground by the communication remote transmission nipple, and the signal is processed and analyzed by the ground system, and finally the casing cementing quality information is obtained.

It should be noted that during detection, the entire logging tool is slowly transported down through the cable 1 into the tubing 11, and during this process the electromagnetic ultrasonic transmitting transducer 7 realizes a 360° rotation, thereby detecting whether there is cement in various parts of the casing. The channeling channel 13 is generated by the failure of the ring cementation, and when there is a channeling channel 13 generated by the cementing failure of the cement ring somewhere in the casing, the cementing quality information of this part of the casing is judged by the above method.

In addition, the number of channeling passages 13 caused by cement sheath cementation failure can be one or multiple places, and the specific position of each cement sheath cementation failure producing channeling passage 13 can be obtained according to the depth of the entire detection tool, so as to judge The sealing strength and safety performance of various parts of the old well shaft.

From the above content, it can be known that the degree of cementation of the above-mentioned cement sheath 8 is directly related to the sealing strength and safety performance of the wellbore of the old well:

(1) A good degree of cementation of the cement sheath 8 indicates that the wellbore is well sealed and the operation is relatively safe;

(2) Poor cementation degree of the cement sheath 8 indicates that the wellbore sealing is weak and the operation is unsafe.

The black line part in accompanying drawing 3 is the information intensity when adopting the traditional method to detect, and the part similar to the gray peak is the signal intensity when adopting the method provided by the present invention to detect. It can be seen from Figure 3 that the signal strength of the detection method adopted by the present invention is very strong, which is obviously better than that of the traditional technology, and more useful signals can be captured.

The method for measuring production casing cementing quality through the tubing based on the electromagnetic ultrasonic transducer proposed by the present invention mainly utilizes the characteristics of electromagnetic ultrasound to run the logging tool directly into the tubing without lifting the completion string to realize production casing cementing quality. Inspection and evaluation of pipe cementing quality.

The method used in the present invention for testing the production casing cementing quality of old wells to be evaluated and in-service wells in a gas storage is realized by an electromagnetic ultrasonic logging tool, and an electromagnetic ultrasonic transducer probe that can rotate at a high speed is arranged at the bottom end of the tool. It can directly excite an ultrasonic signal in the tubing body, and the signal is used as an active detection signal source to propagate to the casing-cement sheath interface, and the excited guided wave will scatter into the annulus protection fluid and carry the echo of cement sheath cementation When the echo signal propagates into the oil pipe body, the electromagnetic ultrasonic receiving transducer at the receiving end can capture the signal, and then process and analyze the captured signal, and finally realize the old well and the gas storage construction to be evaluated. The production casing cementing quality of in-service wells is measured through the tubing.

It should be noted that each electronic component involved in the present invention adopts the prior art, and each of the above-mentioned components is electrically connected with the signal transmission and reception control unit (equivalent to a controller), and the connection between the signal transmission and reception control unit and each component The control circuit between is the prior art.

It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only includes an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (10)

1. A logging tool, characterized by: the electromagnetic ultrasonic device comprises an electromagnetic ultrasonic emitter, an electromagnetic ultrasonic receiver and a driving piece (14), wherein the driving piece (14) is fixedly arranged at one end of the electromagnetic ultrasonic receiver, and the driving end of the driving piece is fixedly connected with the electromagnetic ultrasonic emitter and is used for driving the electromagnetic ultrasonic emitter to rotate.

2. The logging tool of claim 1 wherein: the electromagnetic ultrasonic receiver comprises an electromagnetic ultrasonic signal receiving nipple (5) and a plurality of electromagnetic ultrasonic receiving transducers (6), and the electromagnetic ultrasonic receiving transducers (6) are uniformly and fixedly arranged on the electromagnetic ultrasonic signal receiving nipple (5) at intervals; the driving piece (14) is fixedly arranged at one end of the electromagnetic ultrasonic signal receiving nipple (5).

3. The logging tool of claim 2 wherein: the electromagnetic ultrasonic signal receiving pup joint (5) is of a cylindrical structure, a plurality of electromagnetic ultrasonic receiving transducers (6) are equally divided into a plurality of groups and are uniformly distributed at intervals along the axial direction of the electromagnetic ultrasonic signal receiving pup joint (5), and a plurality of electromagnetic ultrasonic receiving transducers (6) in each group are uniformly distributed at intervals along the circumferential direction of the electromagnetic ultrasonic signal receiving pup joint (5).

4. The logging tool of claim 2 wherein: the system also comprises a signal receiving transmitter, a plurality of electromagnetic ultrasonic receiving transducers (6) are respectively connected with the signal receiving transmitter in a communication way, the signal receiving transmitter is used for controlling the electromagnetic ultrasonic transmitter to send ultrasonic signals, and is used for receiving, processing and storing the signals sent by the electromagnetic ultrasonic receiving transducers (6) and simultaneously sending the processed signals to a receiving terminal.

5. The logging tool of claim 4, wherein: the signal receiving transmitter comprises a communication telemetry nipple (2), a signal amplifying and storing unit (3) and a signal transmitting and receiving control unit (4) which are sequentially in communication connection, wherein the electromagnetic ultrasonic transmitter and the electromagnetic ultrasonic receiving transducers (6) are respectively in communication connection with the signal transmitting and receiving control unit (4), and the communication telemetry nipple (2) is used for being in communication connection with the receiving terminal.

6. The logging tool of claim 5, wherein: the communication telemetry sub (2) the signal amplification and storage unit (3), the signal transmission and reception control unit (4) and the electromagnetic ultrasonic signal receiving sub (5) are sequentially and fixedly connected, the communication telemetry sub (2) is connected with one end of the cable (1), and the other end of the cable (1) is used for being connected with the receiving terminal.

7. The logging tool of any one of claims 1-6, wherein: the electromagnetic ultrasonic transmitter is an electromagnetic ultrasonic transmitting transducer (7).

8. A cannula, characterized by: the well logging tool of any one of claims 1 to 7 and comprising a casing body (9), wherein the casing body (9) is vertically and fixedly arranged, and a cement sheath (8) surrounds the outside of the casing body; the electromagnetic ultrasonic transmitter, the electromagnetic ultrasonic receiver and the driving piece (14) are respectively positioned in the sleeve body (9).

9. A cannula according to claim 8, wherein: an oil pipe (11) is further vertically and fixedly arranged in the sleeve body (9), a closed protection cavity is formed between the oil pipe (11) and the sleeve body (9), and annular protection liquid (10) is filled in the protection cavity; the electromagnetic ultrasonic transmitter, the electromagnetic ultrasonic receiver and the driving piece (14) are respectively positioned in the oil pipe (11).

10. A method for measuring the well cementation quality of a production casing through an oil pipe is characterized by comprising the following steps: the use of a cannula according to claim 8 or 9 for measurements, comprising the specific steps of:

s1: the driving piece (14) drives the electromagnetic ultrasonic emitter to rotate, and simultaneously the electromagnetic ultrasonic emitter excites ultrasonic signals;

s2: the ultrasonic signal propagates to the interface of the cement sheath (8), and a guided wave is excited in the sleeve, and carries the cementing condition information of the cement sheath;

s3: the guided wave is captured by an electromagnetic ultrasonic receiver;

s4: and the electromagnetic ultrasonic receiver transmits the guided wave to the receiving terminal, and the receiving terminal processes and analyzes the information carried by the guided wave to finally obtain the casing cementing quality information.

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