阅读说明：本技术 一种推靠式声波测井接收探头 (Push-leaning type acoustic logging receiving probe ) 是由 张晋言 晁永胜 纪祝华 丁世村 李明刚 许孝凯 韦君 张意 温建平 栢强 翟勇 于 2019-01-30 设计创作，主要内容包括：本发明针对无法准确采集首波的问题,提供一种推靠式声波测井接收探头,该探头由低压电源转换模块、井下声波通讯与存储模块、声波处理模块、声波采集模块、声波接收模块组成；实现了远距离声波测井中反射波的接收与采集,得到远处地层岩石物理特性；具有更好的耐压性、耐温性。(The invention provides a push-type acoustic logging receiving probe aiming at the problem that the head wave cannot be accurately acquired, which consists of a low-voltage power conversion module, an underground acoustic communication and storage module, an acoustic processing module, an acoustic acquisition module and an acoustic receiving module; the receiving and the collection of the reflected waves in the remote acoustic logging are realized, and the physical properties of the stratum rock at the remote place are obtained; has better pressure resistance and temperature resistance.)

1. A push-pull type acoustic logging receiving probe is characterized in that: the probe consists of a low-voltage power supply conversion module, an underground sound wave communication and storage module, a sound wave processing module, a sound wave acquisition module and a sound wave receiving module;

the sound wave receiving module consists of a servo control mechanism, a plurality of pushing arms and a polar plate positioned on the pushing arms, and the receiving transducer and the pre-amplification module are positioned in the polar plate and are responsible for receiving sound wave signals;

the low-voltage power supply conversion module provides low-voltage direct current required by the probe;

the underground sound wave communication and storage module is responsible for communication between the sound wave probe and a ground system and real-time storage of underground sound wave data;

the sound wave processing module is used for sorting, combining and packaging the sound wave data from the sound wave acquisition module and sending the sound wave data into the underground sound wave communication and storage module;

the sound wave acquisition module is responsible for acquiring sound wave data from the receiving module and then transmitting the sound wave data into the sound wave processing module.

2. The push-against acoustic logging receiving probe of claim 1, wherein: the low-voltage power supply conversion module is used for converting high-voltage electricity from a ground system into 5-12V low-voltage direct current electricity to supply power to the underground sound wave communication and storage module, the sound wave processing module, the sound wave acquisition module and the sound wave receiving module.

3. The push-against acoustic logging receiving probe of claim 1, wherein: the receiving frequency range of the receiving transducer is 0-35 kHz.

4. The push-against acoustic logging receiving probe of claim 1, wherein: the leaning arm is controlled by the acoustic wave leaning device through a servo control mechanism.

5. The push-against acoustic logging receiving probe of claim 1, wherein: the polar plate is tightly attached to the pushing arm.

6. A push-against acoustic logging receiving probe according to any of claims 1-5, wherein: viscous electric insulation sealing liquid is injected into the polar plate.

7. A method of using a push-against acoustic logging reception probe according to claim 6, the method comprising: the probe is provided with two power supplies, one is a low-voltage power supply part for receiving the probe and is provided by a low-voltage power supply conversion module, and the other is high-voltage power for controlling the opening and closing legs of the sidewall contact device by the motor servo mechanism, so that the receiving transducer is close to a well wall to measure sound wave signals from a stratum; the underground sound wave communication and storage module decodes the issued command and informs the sound wave processing module after decoding, the sound wave processing module generates motor servo control, emission control and sound wave signal acquisition logics, wherein the motor servo control logics are sent to a servo control mechanism in the receiving module, and the servo mechanism controls a sidewall contact device to push a plurality of receiving transducers positioned on a backup arm to a well wall; the sound wave signal acquisition logic is sent to the sound wave acquisition module by the sound wave processing module, and the sound wave acquisition module controls the sound wave receiving module to acquire, receive and pre-amplify the sound wave signals according to the control logic of the sound wave processing module; the emission control logic is sent to the sound wave emission probe.

8. The method of using a push-against acoustic logging receiving probe of claim 7, wherein: the receiving transducer adopts two paths of parallel sampling for received sound wave signals, one path adopts a low-gain program control sampling mode to finish the acquisition of all periods of waveform, the other path adopts a time control gain sampling mode, a lower gain mode is selected for the acquisition of well hole mode waves at the beginning, and a high gain mode is subsequently adopted for the acquisition of reflected waves.

Technical Field

The invention relates to the technical field of geophysical of mines and provides a pushing type acoustic logging receiving probe.

Background

The traditional sound wave reflected wave well logging receiving probe mainly takes centered measurement, a sound insulation structure with a complex structure is adopted between transmitting and receiving, and the instrument is characterized in that surface sliding waves transmitted along a well wall can be correctly collected under the conditions that a well hole is regular and stratum lithology is compact, and then the surface sliding waves are compared with the reflected waves collected later, and then information such as the direction, the strength and the like of the reflected waves is calculated and determined, so that powerful parameters are provided for stratum evaluation. However, in irregular and loose formations of a borehole, the head wave is weak and multiple peaks exist, so that the reliable sliding direct wave is difficult to obtain due to the fact that the head wave cannot be accurately acquired, and the reflected wave is difficult to determine and calculate.

Disclosure of Invention

Aiming at the defects in the background technology, the invention aims to complete the receiving and the collection of the reflected wave in the remote acoustic logging and obtain the physical characteristics of the rock of the remote stratum, and provides a push-type acoustic logging receiving probe, which has the following technical scheme:

a push-type acoustic logging receiving probe comprises a low-voltage power conversion module, an underground acoustic communication and storage module, an acoustic processing module, an acoustic acquisition module and an acoustic receiving module;

the sound wave receiving module consists of a servo control mechanism, a plurality of pushing arms and a polar plate positioned on the pushing arms, and the receiving transducer and the pre-amplification module are positioned in the polar plate and are responsible for receiving sound wave signals;

the low-voltage power supply conversion module provides low-voltage direct current required by the probe;

the underground sound wave communication and storage module is responsible for communication between the sound wave probe and a ground system and real-time storage of underground sound wave data;

the sound wave processing module is used for sorting, combining and packaging the sound wave data from the sound wave acquisition module and sending the sound wave data into the underground sound wave communication and storage module;

the sound wave acquisition module is responsible for acquiring sound wave data from the receiving module and then transmitting the sound wave data into the sound wave processing module.

Furthermore, the low-voltage power supply conversion module is used for converting high-voltage electricity from the ground system into 5-12V low-voltage direct current electricity to supply power to the underground sound wave communication and storage module, the sound wave processing module, the sound wave acquisition module and the sound wave receiving module.

Further, the receiving frequency range of the receiving transducer is 0-35 kHz.

Further, the pushing arm is controlled by the acoustic wave pushing device through a servo control mechanism.

Furthermore, the polar plate is tightly attached to the pushing arm.

Furthermore, viscous electric insulation sealing liquid is injected into the polar plate.

Furthermore, the use method of the push-type acoustic logging receiving probe comprises two power supplies, wherein one power supply is a low-voltage power supply part of the receiving probe and is provided by a low-voltage power supply conversion module, and the other high-voltage power supply is used for controlling the opening and closing legs of the push-type sidewall contact device by a motor servo mechanism, so that the receiving transducer is close to a well wall to measure acoustic signals from a stratum; the underground sound wave communication and storage module decodes the issued command and informs the sound wave processing module after decoding, the sound wave processing module generates motor servo control, emission control and sound wave signal acquisition logics, wherein the motor servo control logics are sent to a servo control mechanism in the receiving module, and the servo mechanism controls a sidewall contact device to push a plurality of receiving transducers positioned on a backup arm to a well wall; the sound wave signal acquisition logic is sent to the sound wave acquisition module by the sound wave processing module, and the sound wave acquisition module controls the sound wave receiving module to acquire, receive and pre-amplify the sound wave signals according to the control logic of the sound wave processing module; the emission control logic is sent to the sound wave emission probe.

Further the above scheme includes: the receiving transducer adopts two paths of parallel sampling for received sound wave signals, one path adopts a low-gain program control sampling mode to finish the acquisition of all periods of waveform, the other path adopts a time control gain sampling mode, a lower gain mode is selected for the acquisition of well hole mode waves at the beginning, and a high gain mode is subsequently adopted for the acquisition of reflected waves.

The invention has the beneficial effects that: the invention can complete the measurement of the sound wave reflected wave within the range of 100 meters away from the borehole, and the underground instrument can resist the temperature of 175 ℃ and the pressure of 140 MPa.

Drawings

FIG. 1 is a diagram of a receiving probe;

FIG. 2 is a view showing the construction of a reclining arm;

fig. 3 is a signal processing flow chart.

Detailed Description

The following are preferred embodiments of the present invention:

according to fig. 1, the structure comprises: the system comprises a low-voltage power supply conversion module 1, an underground sound wave communication and storage module 2, a sound wave processing module 3, a sound wave acquisition module 4 and a sound wave receiving module 5;

the low-voltage power supply conversion module 1 is used for receiving low-voltage direct current power supply of the probe; the module converts high voltage power from a ground system into +5V and +/-12V low-voltage direct current, and supplies low voltage power to the underground sound wave communication and storage module 2, the sound wave processing module 3, the sound wave acquisition module 4 and the sound wave receiving module 5 after voltage stabilization and filtering.

The underground sound wave communication and storage module 2 is responsible for communication between the sound wave probe and a ground system and real-time storage of underground sound wave data; the module comprises a communication interface circuit 21 and a data real-time storage circuit 22, wherein the communication interface circuit 21 is responsible for demodulating an instruction from a ground system and sending a demodulation result to the sound wave processing module 3 on the one hand, the sound wave processing module 3 is responsible for sending sound wave data to the communication interface circuit 21 and the data real-time storage circuit 22 on the other hand, the sound wave data are sent to the ground system after being modulated by the communication interface circuit 21, and the real-time storage circuit 22 is stored in a downhole high-capacity flash memory in parallel according to time indexes by an ARM single chip microcomputer.

The sound wave processing module 3 is composed of a 16-bit DSP, a million-gate FPGA and related auxiliary circuits, and is responsible for receiving instructions or data demodulated by the communication interface circuit 21 in the underground sound wave communication and storage module 2, interpreting the instructions or data, and determining the contents of the receiving and opening legs of the probe, how to acquire the data and the like according to the interpretation result. On the other hand, the acoustic data from the acoustic acquisition module 4 is processed, merged, packed and compressed and sent to the underground acoustic communication and storage module 2, the communication interface circuit 21 is uploaded to a ground system, and meanwhile the real-time storage circuit 22 is used for parallel underground storage. The leg opening and closing instruction is interpreted and then is driven by the level conversion chip and then is sent to the servo control mechanism in the sound wave receiving module 5 to open and close the legs.

According to fig. 3, the sound wave acquisition module 4 is responsible for performing program-controlled gain amplification, acquisition, sampling integration and digital filtering on the sound wave data from the receiving module 5, and then transmitting the sound wave data into the sound wave processing module 3. In order to effectively ensure the accuracy and reliability of signal acquisition in the acoustic wave signal acquisition process, the instrument adopts a parallel time control gain program control amplification technology in an acquisition module, acoustic wave signals from a polar plate 57 in an acoustic wave receiving module 5 are sampled in amplification modes with different gains at different times, two paths of parallel sampling are carried out during sampling, one path 41 adopts a low-gain program control sampling mode to ensure that the acquisition of all periods of waveforms is completed, the other path 42 adopts a time control gain sampling mode to carry out the acquisition of well hole mode waves by selecting a lower gain mode at the beginning, and then a high gain mode is adopted to carry out the acquisition of reflected waves so as to ensure the sampling accuracy of weak reflected wave signals.

According to fig. 1 and fig. 2, the acoustic wave receiving module 5 is composed of a servo control mechanism, a pushing arm 52 and a pole plate 57 located on the pushing arm, the receiving transducer 53 and the pre-amplification module 54 are located in the pole plate 57, the receiving transducer 53 receives acoustic wave signals from the formation, and the acoustic wave signals are amplified and filtered by the pre-amplification module 54; the servo control mechanism consists of a motor 56, a driving lead screw 55, pushing fixing blocks 58 and 50, a supporting steel column 59 and a limit switch 51, wherein the motor 56 drives the pushing fixing blocks 58 to drive a plurality of pushing arms 52 and pole plates 57 to open and close by driving the lead screw 55 to rotate, so that the pole plates are close to or away from the well wall. The pushing fixing block 50 is positioned between the two limit switches 51, the moving stroke of the pushing fixing block is controlled by the limit switches 51, when the pushing fixing block 50 touches the limit switches 51, the motor is automatically powered off, and the leg folding and unfolding process is ended.

The push-pull type acoustic logging receiving probe is arranged on a downhole target layer through a standard 7-core cable for logging to receive acoustic wave reflected waves from a stratum and mode waves in a part of well holes; the ground logging system supplies power and communicates data to the underground sound wave receiving probe through the 7-core cable. The high voltage power supplied to the receiving probe through the 7-core cable is converted into various low voltage direct currents by a low voltage power supply conversion module in the sound wave receiving probe, and the low voltage power is supplied to the underground sound wave communication and storage module, the sound wave processing module, the sound wave acquisition module and the sound wave receiving module. One path of the signal is supplied to a servo control mechanism in the sound wave receiving module and is used for pushing the arm to open the leg, so that the polar plate is tightly attached to the well wall to measure the sound wave signal. The ground system sends down the measurement parameters and instructions to the communication interface circuit in the underground sound wave communication and storage module through the 7-core cable, the communication interface circuit demodulates the measurement parameters and instructions from the ground system, the demodulation result is sent to the sound wave processing module, the sound wave processing module interprets the measurement parameters and instructions, and the next work of the probe is determined according to the interpretation result. One of the instructions forms a leg opening and closing instruction, the leg opening and closing instruction is sent to a servo control mechanism in the sound wave receiving module after being driven by the sound wave processing module, and the servo control mechanism controls a motor to drive a pushing and pushing fixing block to drive a plurality of pushing and leaning arms and pole plates to open and close by driving a lead screw to rotate under the supply of the high-voltage electricity, so that the pole plates are close to or away from a well wall. A parameter and an instruction are used for acquisition control, after a polar plate is attached to a well wall, the acquired parameter is sent to a sound wave acquisition module through a sound wave processing module, and sound wave data acquisition is started.

The polar plate is attached to the well wall during collection, sound wave reflected wave signals from the stratum are received by a receiving transducer in the polar plate, then are amplified by a preamplification module in the polar plate and then are transmitted into the sound wave collection module, the collection module firstly performs program control gain amplification on sound wave data, the program control gain amplification adopts a parallel time control gain amplification technology, the sound wave signals are amplified in different time and different gain amplification modes, two paths are performed simultaneously during amplification, one path adopts a low gain program control mode, the other path adopts a time control gain mode, the signals are digitized by a collection circuit after the program control amplification, analog signals are converted into digital signals, then sound wave shape optimization calculation such as sampling integration and digital filtering is selectively performed according to measurement parameters transmitted by a ground system, and then the sound wave signals are transmitted into a sound wave processing module. The sound wave processing module is used for sorting, combining, compressing and packaging sound wave data from the sound wave acquisition module, one part of the sound wave data is sent to the underground sound wave communication and storage module, the communication interface circuit is used for coding and modulating the sound wave data and then uploading the modulated sound wave data to a ground system, and the other part of the sound wave data is sent to the real-time storage circuit for underground parallel storage.