CN201367903Y - Segmented bond tool - Google Patents

Abstract

The utility model relates to a partitioned cement cementation logging instrument. The utility model includes an electronic circuit and a sound system. The sound system consists of a transmitting transducer part, a partitioned receiving transducer part, a 3' receiving transducer part, and a 5' receiving transducer part. 'The receiving transducer part is connected front and back through the sound insulation device, and the end is equipped with a pressure balance device; the front end of the transmitting transducer part is surrounded by several partitioned transmitting transducers, and the rear end is equipped with an omnidirectional transmitting transducer; The partitioned receiving transducer part is equipped with a partitioned receiving transducer corresponding to the partitioned transmitting transducer; the 3' receiving transducer part is equipped with a 3' receiving transducer, and the 5' receiving transducer part is equipped with a 5' receiving transducer transducer. The beneficial effects of the utility model are as follows: 1. The measurement result is basically not affected by the rapid formation by adopting a shorter source distance; Smaller channeling was detected, which overcomes the ambiguity of ordinary acoustic variable density logging.

Description

A Partition Cement Bonding Logging Tool

technical field

The utility model relates to a well logging instrument, in particular to a partitioned cement bonded well logging instrument.

Background technique

Sonic logging is one of the logging methods widely used in petroleum industry. Cement bond logging is a common method to evaluate the cement solidification quality. The detection of the reflection amplitude of the acoustic wave at the interface of different materials can determine the cementation quality between the casing and the cement sheath, and between the cement sheath and the formation. Conventional cement cementation logging tools are used to detect the cementation quality of the casing cement sheath omnidirectionally, which can only reflect the average value of the cementation quality of the cement sheath detected, and cannot reflect the detection caused by cement grooves, partial cementation status or well pressure. deviation.

Contents of the invention

The utility model aims to solve the above-mentioned shortcomings of the prior art, and provides a partitioned cement cement logging tool that can measure the sound amplitude of multiple angles around the casing and reflect the detection deviation caused by cement grooves, partial cement conditions or pressure in the well.

The technical scheme adopted by the utility model to solve the technical problems: the partitioned cement bonded logging instrument includes electronic circuits and a sound system, and the sound system is composed of a transmitting transducer part, a partitioned receiving transducer part, and a 3' receiving transducer The transducer part and the 5' receiving transducer part are connected front and back through the sound insulation device, and the end is equipped with a pressure balance device; the front end of the transmitting transducer part is surrounded by several partitioned transmitting transducers, and the rear end is equipped with Omnidirectional transmitting transducer; the partition receiving transducer part is equipped with a partition receiving transducer corresponding to the partition transmitting transducer; the 3' receiving transducer part is equipped with a 3' receiving transducer, so The 5' receiving transducer assembly is equipped with a 5' receiving transducer.

Eight partitioned emission transducers are uniformly surrounded in the emission transducer part. The sound system is fitted with a grooved enclosure. The transmitting transducer part is equipped with a sound-permeable cover. The sound insulation device is mainly composed of bellows. The pressure balance device consists of a bellows and a piston set outside it. The partitioned emission transducers are fixed on the bayonet of the rubber ring, and the rubber ring is mounted on the support shaft of the emission transducer. The partition receiving transducer is fixed on the bayonet socket of the rubber ring, and the rubber ring is mounted on the supporting shaft of the receiving transducer. Electronics consist of power supply, cable drivers, timing, modulator, preamplifier and transmit section connections.

The beneficial effects of the utility model are as follows: 1. The measurement result is basically not affected by the rapid formation by adopting a shorter source distance; The influence of gas-containing liquid and the casing effect are minimized at the same time, and small channeling can be detected, which overcomes the ambiguity of ordinary acoustic variable density logging.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the structural representation of sound system;

Fig. 3 is a schematic diagram of the cross-sectional structure of A-A of Fig. 2;

Fig. 4 is the block diagram of electronic circuit;

Explanation of reference signs: electronic circuit 1, sound system 2, pressure balance device 3, partitioned transmitting transducer 4, omnidirectional transmitting transducer 5, rubber ring 6, transmitting transducer supporting shaft 7, sound-permeable cover 8, Sound insulation device 9, partition receiving transducer 10, 3' receiving transducer 11, 5' receiving transducer 12, receiving transducer support shaft 13, grooved shell 14, bellows 15, piston 16, transmitting transducer Transducer part 17, partition receiving transducer part 18, 3' receiving transducer part 19, 5' receiving transducer part 20.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

With reference to accompanying drawing: the utility model comprises electronic circuit 1 and sound system 2. The exterior of the sound system 2 is equipped with a grooved casing 14, and the interior consists of a transmitting transducer part 17, a partition receiving transducer part 18, a 3' receiving transducer part 19, and a 5' receiving transducer part 20 through a sound insulation device 9 It is formed by connecting front and back, and the end is equipped with a pressure balance device 3; the front side of the transmitting transducer part 17 is evenly surrounded by eight partitioned transmitting transducers 4, and the partitioned transmitting transducers 4 are installed in one with eight uniformly distributed On the rubber ring 6 of the bayonet, there are two protruding blocks of 180° on the inner hole of the rubber ring 6, and are stuck on the supporting shaft 7 of the transmitting transducer by the protruding blocks, which are used to locate the position of a sector and prevent the The subregional emission transducer 4 is displaced, and the subregional emission transducer 4 scans and emits in sequence. The rear side is equipped with an omnidirectional emission transducer 5 composed of two emitters connected in parallel. The emission transducer part 17 is equipped with a thin-walled The sound-permeable cover 8 made of metal cans adopts the method of pressing both ends after being put on, which is not only reliable in contact but also does not come out, so that the energy emitted into the fluid is maximized; There are eight partition receiving transducers 10, which are also fixed on the receiving transducer support shaft 13 in the same way, and ensure that it corresponds to a sector of the partition emitting transducer 4 on the same straight line, which can satisfy its The corresponding partitioned transmitting transducers 4 receive synchronously to ensure that each pair of transducers can detect the sound amplitude in the 45° area around the casing; the 3' receiving transducer part 19 is equipped with a 3' receiving transducer 11 , the 5' receiving transducer part 20 is equipped with a 5' receiving transducer 12, which is used in conjunction with the omnidirectional transmitting transducer 5 to provide standard full-wave detection. The sound insulation device 9 adopts the bellows 15 for sound insulation, so that the direct wave arrives at the receiving transducer later than the detected casing wave and formation wave. The pressure balance device 3 is completed by the bellows 15 and the piston 16. When the internal pressure is high, the piston 16 moves outward, and the bellows 15 stretches; when the external pressure is high, the piston 16 moves inward, and the bellows 15 compresses.

The electronic circuit 1 is composed of power supply, cable drive, timing, modulator, preamplifier and transmission part connection. The working power supply is provided by the ground, and the power board uses the power provided by the ground to generate the high (+200V) and low (±12V) voltage power supplies required by the instrument through the switching power supply; the sequential circuit mainly generates all control signals of the instrument, and these control signals mainly include Selection of transmitting and receiving transducer pairs, synchronous timing signals, transmitting timing signals, GR and neutron gamma gating signals, modulation timing of uploading signals, generation of CAL pulses, etc.; Under the control of the sequential circuit, the +200V voltage of the step-up pulse transformer increases the secondary coil to about 1000V, which is used to drive the transmitting transducer. Each sector transducer corresponds to a group of step-up pulse transformers; the pre-amplification circuit Form a matching network that matches the signal of the receiving transducer, the signal gain of the preamplifier is independently adjustable, and has the functions of low-output output impedance, multi-channel signal gating, etc.; the modulator circuit converts the square wave signal from the timing board The sine signal is shaped into a sine signal and sent to the multiplexer together with the sector signal after envelope detection. After the sector signal is modulated, it is sent to the cable drive board under the action of the synchronous selection signal; the cable drive circuit is mainly used for instrument signal The control of the signal transmission of the cable drive and the lower-end instrument, and control the recoil by controlling the amplitude and width of the pulse signal (such as GR signal and neutron signal) uploaded by the lower-end instrument, and at the same time, the board transmits the DC high-voltage power to the lower-end circuit .

In addition to the above embodiments, the utility model can also have other implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the utility model.

Claims (9)

1. A partitioned cement bond logging tool, comprising an electronic circuit (1) and a sound system (2), characterized in that: the sound system (2) is composed of a transmitting transducer part (17), a partitioning receiving transducer The component (18), the 3' receiving transducer component (19), and the 5' receiving transducer component (20) are connected back and forth through the sound insulation device (9), and the end is equipped with a pressure balance device (3); The front end of the transmitting transducer part (17) is surrounded by several subregional transmitting transducers (4), and the rear end is equipped with omnidirectional transmitting transducers (5); the subregional receiving transducer part (18) is equipped with The partition receiving transducer (10) corresponding to the partition transmitting transducer (4); the 3' receiving transducer part (19) is equipped with a 3' receiving transducer (11), and the 5' receiving transducer The transducer part (20) is equipped with a 5' receiving transducer (12). 2. The zoned cement cementation logging tool according to claim 1, characterized in that: eight zoned transmitting transducers (4) are uniformly arranged inside the transmitting transducer part (17). 3. The partitioned cement bond logging tool according to claim 1, characterized in that: the sound system (2) is equipped with a grooved casing (14). 4. The partitioned cement bond logging tool according to claim 1, characterized in that: the transmitting transducer part (17) is equipped with a sound-permeable cover (8). 5. The partitioned cement bond logging tool according to claim 1, characterized in that: the sound insulation device (9) is mainly composed of bellows (15). 6. The partitioned cement bond logging tool according to claim 1, characterized in that: the pressure balance device (3) is composed of a bellows (15) and a piston (16) sleeved outside it. 7. The partitioned cement bond logging tool according to claim 1, characterized in that: the partitioned transmitting transducer (4) is fixed on the bayonet of the rubber ring (6), and the rubber ring (6) is mounted on the launcher On the transducer support shaft (7). 8. The partitioned cement bond logging tool according to claim 7, characterized in that: the partition receiving transducer (10) is fixed on the bayonet of the rubber ring (6), and the rubber ring (6) is mounted on the receiving On the transducer support shaft (13). 9. The zoned cement bond logging tool according to claim 1, characterized in that: the electronic circuit (1) is composed of power supply, cable drive, timing, modulator, preamplifier and transmission part.

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