A cement bonding logging instrument testing device

Abstract

The present invention belongs to the technical field of cable logging, and discloses a cement bond logging instrument testing device capable of performing complete functional detection on a cement bond logging instrument. The device comprises a downhole environment simulation device and a ground control box connected to the cement bond logging instrument, wherein the downhole environment simulation device comprises an experimental casing and a cement bearing platform bonded to its outer periphery, the cement bond logging instrument is located in the experimental casing, and the experimental casing is provided with a water injection port and a pressurizing port for injecting, draining, exhausting and pressurizing the experimental casing, and the ground control box comprises at least a display control tablet computer, a DC power supply, an analog cable, a codec main control board, a cable core control board and an on-off insulation detection board, wherein the display control tablet computer is connected to the codec main control board, the codec main control board is simultaneously connected to the DC power supply, the analog cable and the on-off insulation detection board, the DC power supply is connected to the analog cable, and the cable core control board is simultaneously connected to the analog cable, the on-off insulation detection board and the cement bond logging instrument.

Description

Technical Field

[0001] The invention relates to the technical field of cable logging, and in particular to a cement bonding logging instrument testing device. Background Art

[0002] Cement bond logging tool is a logging instrument specially used to evaluate the quality of cement bonding. Its main function is to judge the bonding quality between casing and cement ring, cement ring and formation through the changes of sound waves or other physical quantities.

[0003] Cement bond logging instruments are usually composed of three short sections, namely the communication short section, the push-pull short section and the variable density short section. During the workshop maintenance inspection, engineers are required to manually perform the on-off insulation of the three short sections, as well as detect the communication status, the push-pull short section electrode plate acoustic signal and the variable density short section acoustic signal. The existing cement bond logging instrument test device currently needs to provide two test environments for the cement bond logging instrument, one is the detection of the electrode plate signal, and the other is the detection of the variable density short section. However, during the maintenance process of the cement bond logging instrument, only the self-transmitting and self-receiving detection of the electrode plate can be realized. For the detection of the variable density short section, the cement bond logging instrument is placed in a water tank and waited for several hours, which cannot fully and efficiently simulate the downhole working state. For the detection of the on-off insulation of the cement bond logging instrument, the current method is to cooperate with two engineers to use a multimeter to perform on-off and insulation detection on the 32-core / 28-core of each short section of the instrument, which is time-consuming and labor-intensive. The current method for testing the instrument function of cement bond logging instruments is to connect the instrument to the ground equipment, and the maintenance engineer will judge the form of the self-transmitted and self-received signals of a single plate, but it is impossible to detect the signals between adjacent plates. In addition, due to the special structure and working principle of cement bond logging instruments, it requires an acoustic wave transmission medium and a similar downhole environment for normal operation. There is no such suitable environment during the ground test in the workshop, and it is impossible to realize the full function test of the cement bond logging instrument. Summary of the invention

[0004] In order to detect the complete functions of a cement bond logging tool, the present invention provides a cement bond logging tool testing device.

[0005] According to the present invention, the cement bond logging instrument testing device comprises: a downhole environment simulation device, and a ground control box connected to the cement bond logging instrument, wherein the downhole environment simulation device comprises an experimental casing and a cement bearing platform bonded to the outer periphery of the experimental casing, the cement bond logging instrument is located in a sealed cavity formed by the experimental casing, and the experimental casing is provided with a water injection port and a pressurizing port, which cooperate to inject water, drain water, exhaust gas and pressurize the experimental casing, and the ground control box comprises at least a display control tablet computer, a DC power supply, an analog cable, a codec main control board, a cable core control board and an on-off insulation detection board, the display control tablet computer is connected to the codec main control board, the codec main control board is simultaneously connected to the DC power supply, the analog cable and the on-off insulation detection board, the DC power supply is connected to the analog cable, and the cable core control board is simultaneously connected to the analog cable, the on-off insulation detection board and the cement bond logging instrument.

[0006] Furthermore, the end of the experimental casing is closed, a sealing structure is provided at the head end, a water injection port and a pressurizing port are provided at the head end of the experimental casing, a first valve is provided at the water injection port, a second valve and a pressure device connected to the second valve are provided at the pressurizing port.

[0007] Furthermore, the experimental casing is a 9.5-inch casing, the pressure inside the experimental casing is stable between 1Mp and 3Mp, and the density of the cement bearing platform is greater than 1.30g / cm 3 It is made after the high-density cement solidifies.

[0008] Furthermore, a water injection observation port is also provided at the end of the experimental casing.

[0009] Furthermore, the display control tablet computer is provided with automatic testing software, which exchanges information with the codec main control board through the network. The codec main control board is used to encode the commands issued by the automatic testing software and decode the data uploaded by the cement bond logging instrument. The DC power supply has a program control function, and the DC power supply supplies power to the cement bond logging instrument through an analog cable and a connecting line. The automatic testing software sends a control command to the codec main control board, and the codec main control board communicates with the DC power supply to realize the output and shutdown of the power supply voltage.

[0010] Furthermore, the simulated cable is formed by connecting a plurality of resistors with specific resistance values ​​and capacitors with specific capacitance values ​​in series and in parallel, and the resistance and capacitance of a real cable are simulated through the combination of resistors and capacitors.

[0011] Furthermore, the cement bond logging instrument includes a communication pup joint, a push-on pup joint and a variable density pup joint, and the cement bond logging instrument test device has an on-off insulation test function: during the on-off test, the upper and lower connectors of each pup joint in the cement bond logging instrument are simultaneously connected to the cable core control board, which is automatically switched through the cable core control board, and the on-off insulation detection board detects the on-off status of the corresponding core, and finally transmits the detection result to the encoding and decoding main control board, which is then transmitted to the automatic testing software for processing by the encoding and decoding main control board; during the insulation test, the upper connector or the lower connector of each pup joint in the cement bond logging instrument is respectively connected to the cable core control board, which is automatically switched through the cable core control board, and the on-off insulation detection board detects the on-off status of the corresponding core, and finally transmits the detection result to the encoding and decoding main control board, which is then transmitted to the automatic testing software for processing by the encoding and decoding main control board.

[0012] Furthermore, the cement bond logging instrument testing device also has a functional detection function for the cement bond logging instrument: the short sections in the cement bond logging instrument are connected using jumper wires, and the automatic testing software is started to monitor the communication status. The functional detection function at least includes communication status detection: the automatic testing software sends fixed data to the cement bond logging instrument. After the cement bond logging instrument receives these data and returns the correct data, it calibrates the communication status as normal and writes the result into the test report file; if the returned data is abnormal, a connection configuration check is prompted and the communication status is written into the test report file until the communication status is normal and the next functional test is entered.

[0013] Furthermore, the functional detection function also includes performing a variable density pup joint test or a push-on pup joint test on the cement bond logging instrument: placing the variable density pup joint and the push-on pup joint into a downhole environment simulation device, and performing water injection and pressure injection, the automatic testing software controls the acoustic wave emission and reception of the variable density pup joint, and writes the received acoustic wave waveform data into the test report file; the automatic testing software completes the acquisition of multiple acoustic wave sequences in sequence according to the designed order, and saves the acquisition results into the test report file.

[0014] Furthermore, the functional detection function also includes auxiliary function testing of the cement bond logging instrument: the automatic testing software completes at least the detection of azimuth, natural gamma, magnetic positioning, ambient temperature and power supply voltage in sequence according to a preset detection sequence.

[0015] Compared with the prior art, the cement bond logging instrument testing device of the present invention has the following advantages:

[0016] The cement bond logging instrument testing device of the present invention can provide the environmental conditions required for the normal operation of the cement bond logging instrument, avoid ignoring potential instrument failures due to incomplete testing during maintenance and inspection, resulting in operation failure and causing economic and time losses. At the same time, it can realize cross-plate detection, and can achieve rapid coupling between acoustic wave transmission media through pressure, and can accurately and conveniently realize instrument maintenance and inspection.

[0017] The cement bond logging instrument test device of the present invention directly connects the cement bond logging instrument to the ground control box through the designed 32-core / 28-core connector. The automatic testing software controls the cable core control board to switch the cable core pair to be tested. The on-off insulation detection board performs on-off insulation detection, and uploads the detection result to the automatic testing software. The testing process saves time and labor, greatly reduces the investment of human resources and time resources, quickly and conveniently realizes the automation of the maintenance process, greatly improves the accuracy of maintenance, and ensures current operations.

[0018] The cement bond logging instrument testing device of the present invention can complete the self-transmitting and self-receiving signal detection of a single plate through a pre-designed testing process, and can realize the signal cross detection between adjacent plates in conjunction with the downhole environment simulation device.

[0019] The cement bond logging instrument testing device of the present invention can realize intelligent detection of various functional parameters and generate a detection report on the premise that the testing hardware such as the cement bond logging instrument and the downhole environment simulation device are prepared. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a cement bond logging instrument testing device according to an embodiment of the present invention;

[0021] Figure 2 for Figure 1 The structural schematic diagram of the downhole environment simulation device is shown. DETAILED DESCRIPTION

[0022] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0023] Figure 1 FIG. 1 shows the structure of a cement bonding logging instrument testing device 100 according to an embodiment of the present invention. Figure 1 and Figure 2As shown, the cement bond logging tool testing device 100 may include: a downhole environment simulation device 10 , and a ground control box 20 connected to the cement bond logging tool 30 . Among them, the downhole environment simulation device 10 may include an experimental casing 11 and a cement bearing platform 12 bonded to the outer periphery of the experimental casing 11, the cement bonding logging instrument 30 is located in the sealed cavity 13 formed by the experimental casing 11, and the experimental casing 11 is provided with a water injection port 15 and a pressurization port 16, which are used to inject water, drain water, exhaust and pressurize the experimental casing 11. The ground control box 20 may at least include a display control tablet computer 21, a DC power supply 23, an analog cable 24, a codec main control board 22, a cable core control board 25 and an on-off insulation detection board 26. The display control tablet computer 21 is connected to the codec main control board 22, and the codec main control board 22 is also connected to the DC power supply 23, the analog cable 24 and the on-off insulation detection board 26. The DC power supply 23 is connected to the analog cable 24, and the cable core control board 25 is also connected to the analog cable 24, the on-off insulation detection board 26 and the cement bonding logging instrument 30.

[0024] In the cement bonding logging instrument test device 100 of the embodiment of the present invention, the downhole environment simulation device 10 is used to simulate the downhole casing and cement bonding conditions to provide the cement bonding logging instrument with the environmental conditions required for normal operation; the ground control box 20 is used to perform on-off insulation and communication state tests on the communication pup joint, the push-on pup joint and the variable density pup joint of the cement bonding logging instrument 30, and to detect the plate acoustic wave signal of the push-on pup joint and the acoustic wave signal of the variable density pup joint. The ground control box 20 can be designed as a portable detection box, integrating components such as a display control tablet computer 21, a DC power supply 23, an analog cable 24, a codec main control board 22, a cable core control board 25 and an on-off insulation detection board 26, so as to realize a complete automatic detection of the cement bonding logging instrument 30, and automatically print a test report at the end. When in use, the ground control box 20 can be directly placed near the downhole environment simulation device 10, and directly connected to the cement bonding logging instrument 30 in the downhole environment simulation device through a customized connecting line (32 cores / 28 cores). After the DC power supply 23 is powered, the test software in the display control tablet computer 21 is started. The system automatically performs on-off insulation detection, communication status test, and detection of the plate acoustic wave signal of the push-to-pull short section of the cement bonding logging instrument 30 and the acoustic wave signal of the variable density short section according to the set test process, and finally generates a test report based on the test results.

[0025] In such Figure 2In the preferred embodiment shown, the end of the experimental casing 11 can be closed by a sealing plug 17, and a sealing structure 18 is provided at the head end. After the short section of the cement bonding logging instrument 30 is placed in the experimental casing 11, it is sealed by this sealing structure 18; the water injection port 15 and the pressurizing port 16 are provided at the head end of the experimental casing, and are preferably arranged relative to each other so as to more fully drain and exhaust gas when the two cooperate; a first valve (not shown in the figure) can be provided at the water injection port 15 to control the opening and closing of the water injection port 15, and water can be injected into the experimental casing 11 through the first valve, and a second valve and a pressure device connected to the second valve (not shown in the figure) can be provided at the pressurizing port 16 to apply the required pressure to the experimental casing 11.

[0026] In a preferred embodiment, in order to simulate the underground environment more realistically, the experimental casing 11 can be selected as a 9.5-inch casing, the pressure in the experimental casing 11 can be stabilized between 1Mp and 3Mp, and the cement bearing platform 12 uses a density greater than 1.30g / cm 3 It is made after the high-density cement solidifies. In this embodiment, the 9.5-inch casing is a commonly used model for offshore oil wells, and the length is preferably 4.5 meters, the inner diameter is 216.5mm, and the outer diameter is 244.5mm. The size of the cement bearing platform 12 is preferably 4500x350x350mm. The cement bearing platform 12 and the experimental casing 11 need to be well bonded. The entire cement bearing platform 12 and the experimental casing 11 are placed in the instrument test area. When in use, the instrument is placed in the experimental casing 11, sealed, and injected with clean water. When necessary, it can be pressurized by a pressure pump to simulate the actual downhole environment.

[0027] In such Figure 2 In the preferred embodiment shown, a water filling observation port 14 may be further provided at the end of the test casing 11 to facilitate observation of whether the test casing 11 is filled with water.

[0028] In another preferred embodiment, the downhole environment simulation device 10 may also include an angle adjustment device connected to the cement supporting platform 12, which is used to achieve angle adjustment of the downhole environment simulation device 10 relative to the horizontal plane to provide a more realistic downhole simulation environment for the cement bond logging instrument 30.

[0029] According to the present invention, in Figure 1In the preferred embodiment shown, the display control tablet computer 21 is provided with automatic testing software, and the automatic testing software exchanges information with the codec main control board 22 through the network. The codec main control board 22 is used to encode the commands issued by the automatic testing software and decode the data uploaded by the cement bond logging instrument 30. The codec type is preferably Manchester, and the DC power supply 23 has a program control function. The DC power supply 23 supplies power to the cement bond logging instrument 30 through the analog cable 24 and the connecting line. The power supply voltage is preferably 150VDC. The automatic testing software sends a control command to the codec main control board 22, and the codec main control board 22 preferably communicates with the DC power supply 23 through the RS485 interface to realize the output and shutdown of the power supply voltage.

[0030] Preferably, the simulation cable 24 can be formed by connecting a plurality of resistors with specific resistance values ​​and capacitors with specific capacitance values ​​in series and in parallel, and the resistance and capacitance of the real cable can be simulated by the combination of resistors and capacitors. The purpose is to simulate the real logging conditions so that the cement bonding logging instrument 30 can establish stable and reliable communication with the ground system without any adjustment.

[0031] According to the present invention, the cement bond logging tool testing device 100 has multiple testing functions. The cement bond logging tool 30 may include a communication sub, a push-on sub, and a variable density sub.

[0032] In a preferred embodiment, the cement bond logging instrument test device 100 has a continuity and insulation test function: during the continuity test, the upper and lower connectors of each short section in the cement bond logging instrument 30 are simultaneously connected to the cable core control board 25, and automatically switched through the cable core control board 25, and the continuity and insulation detection board 26 detects the continuity and disconnection of the corresponding core, and finally transmits the detection result to the codec main control board 22, and then the codec main control board 22 transmits it to the automatic test software for processing; during the insulation test, the upper connector or the lower connector of each short section in the cement bond logging instrument 30 is respectively connected to the cable core control board, and automatically switched through the cable core control board 25, and the continuity and insulation detection board 26 detects the continuity and disconnection of the corresponding core, and finally transmits the detection result to the codec main control board 22, and then the codec main control board 22 transmits it to the automatic test software for processing.

[0033] In this embodiment, the main function of the on-off insulation detection board is to perform on-off test or insulation test on the 32 cores (or 28 cores) of the instrument. Each short section in the cement bonding logging instrument 30 has two upper and lower joints, and each joint has 32 cores or 28 cores. When testing on-off, one upper and one lower joint are required, and these cores of the upper and lower joints are connected to the interface of the ground control box 20 through wires, and automatically switched through the cable core control board 25, and the on-off insulation detection board 26 detects the on-off status of the corresponding core. When testing insulation, it is necessary to do it once on the upper and lower joints, and also introduce each core of the joint into the cable core control board 25 for automatic switching, and the on-off insulation detection board 26 detects the insulation status of the corresponding core to the ground.

[0034] Furthermore, the cement bond logging instrument testing device 100 also has a functional detection function for the cement bond logging instrument 30: the short sections in the cement bond logging instrument 30 are connected using jumper wires, and the automatic testing software is started to monitor the communication status. The functional detection function at least includes communication status detection: the automatic testing software can send fixed data (preferably 1K words) to the cement bond logging instrument 30. After the cement bond logging instrument 30 receives these data and then returns the correct data, it calibrates the communication status as normal and writes the result into the test report file; if the returned data is abnormal, a connection configuration check is prompted and the communication status is written into the test report file until the communication status is normal before entering the next functional test.

[0035] Furthermore, the functional detection function may also include performing a variable density pup joint test or a push-on pup joint test on the cement bond logging instrument 30: placing the variable density pup joint and the push-on pup joint into the downhole environment simulation device 10, and performing water injection and pressure injection, the automatic testing software controls the acoustic wave emission and reception of the variable density pup joint, and writes the received acoustic wave waveform data into the test report file; the automatic testing software completes multiple (preferably 12 subsets) acoustic wave sequence acquisitions in sequence according to the designed order, and saves the acquisition results into the test report file.

[0036] Furthermore, the functional detection function may also include auxiliary function testing of the cement bond logging instrument 30: the automatic testing software completes the detection of azimuth, natural gamma ray (GR), magnetic positioning (CCL), ambient temperature and power supply voltage in sequence according to the preset detection sequence.

[0037] The testing process of the cement bond logging instrument testing device 100 according to the embodiment of the present invention is as follows:

[0038] (1) Conducting a continuity and insulation test on each short section in the cement bond logging tool 30: The cable core control board 25 and the continuity and insulation detection board 26 are controlled by the automatic test software to test the communication short section, the push-to-pull short section and the variable density short section respectively, and the test results are saved in the test report file;

[0039] (2) Performing a functional test on the cement bond logging tool 30: Connecting the communication sub, the push-pull sub, and the variable density sub using jumper wires, starting the automatic test software to monitor the communication status, and then performing a communication status test, an auxiliary function test, a variable density sub test, and a push-pull sub test in sequence;

[0040] (3) After the entire test process is completed, the automatic detection software will combine the entire test report file with other information such as test time and tester to produce a test report in PDF format.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A cement bond logging instrument testing device, characterized in that: include: A downhole environment simulation device, and a ground control box connected to a cement bond logging instrument, wherein the downhole environment simulation device is used to provide the cement bond logging instrument with the environmental conditions required for normal operation, and the ground control box is used to detect the cement bond logging instrument, wherein the downhole environment simulation device comprises an experimental casing and a cement bearing platform bonded to the outer periphery of the experimental casing, the cement bond logging instrument is located in a sealed cavity formed by the experimental casing, and the experimental casing is provided with a water injection port and a pressurizing port, which cooperate to inject water, drain water, exhaust gas and pressurize the experimental casing, and the ground control box comprises at least a display control tablet computer, a DC power supply, an analog cable, a codec main control board, a cable core control board and an on-off insulation detection board, the display control tablet computer is connected to the codec main control board, the codec main control board is simultaneously connected to the DC power supply, the analog cable and the on-off insulation detection board, the DC power supply is connected to the analog cable, and the cable core control board is simultaneously connected to the analog cable, the on-off insulation detection board and the cement bond logging instrument; The display control tablet computer is provided with automatic test software, the automatic test software exchanges information with the codec main control board through the network, the codec control board is used to encode the commands issued by the automatic test software, and decode the data uploaded by the cement bond logging instrument, the DC power supply has a program control function, the DC power supply supplies power to the cement bond logging instrument through the analog cable and the connecting line, the automatic test software sends a control command to the codec control board, the codec control board communicates with the DC power supply, and realizes the output and shutdown of the power supply voltage; The cement bond logging instrument comprises a communication pup joint, a push-on pup joint and a variable density pup joint, and the cement bond logging instrument test device has an on-off insulation test function: during the on-off test, the upper and lower joints of each pup joint in the cement bond logging instrument are simultaneously connected to the cable core control board, and are automatically switched through the cable core control board, and the on-off insulation detection board detects the on-off status of the corresponding core, and finally transmits the detection result to the encoding and decoding control board, and then the encoding and decoding control board transmits it to the automatic test software for processing; during the insulation test, the upper joint or the lower joint of each pup joint in the cement bond logging instrument is respectively connected to the cable core control board, and is automatically switched through the cable core control board, and the on-off insulation detection board detects the on-off status of the corresponding core, and finally transmits the detection result to the encoding and decoding control board, and then the encoding and decoding control board transmits it to the automatic test software for processing; The cement bond logging instrument testing device also has a function of functional detection of the cement bond logging instrument: each short section in the cement bond logging instrument is connected using a jumper wire, and the automatic test software is started to monitor the communication status, and the functional detection function at least includes communication status detection: the automatic test software sends fixed data to the cement bond logging instrument, and after the cement bond logging instrument receives these data and returns the correct data, the communication status is calibrated as normal, and the result is written into the test report file; if the returned data is abnormal, a connection configuration check is prompted, and the communication status is written into the test report file until the communication status is normal and the next step of functional testing is entered; The functional detection function also includes performing a variable density pup joint test or a push-to-pull pup joint test on the cement bond logging instrument: placing the variable density pup joint and the push-to-pull pup joint in the downhole environment simulation device, and performing water injection and pressure testing, the automatic testing software controls the acoustic wave emission and reception of the variable density pup joint, and writes the received acoustic wave waveform data into the test report file; the automatic testing software sequentially completes the acquisition of multiple acoustic wave sequences according to the design sequence, and saves the acquisition results into the test report file; The functional detection function also includes an auxiliary function test of the cement bond logging instrument: the automatic test software completes at least the detection of azimuth, natural gamma, magnetic positioning, ambient temperature and power supply voltage in sequence according to a preset detection sequence.

2. The cement bond logging instrument testing device according to claim 1, characterized in that: The end of the experimental sleeve is closed, and a sealing structure is arranged at the head end. The water injection port and the pressurizing port are arranged at the head end of the experimental sleeve. A first valve is arranged at the water injection port, and a second valve and a pressure device connected to the second valve are arranged at the pressurizing port.

3. The cement bond logging instrument testing device according to claim 2, characterized in that: The experimental casing is a 9.5-inch casing, the pressure inside the experimental casing is stable between 1Mp and 3Mp, and the cement bearing platform has a density greater than 1.30g / cm 3 It is made after the high-density cement solidifies.

4. The cement bond logging instrument testing device according to claim 2, characterized in that: The end of the experimental casing is also provided with a water injection observation port.

5. The cement bond logging instrument testing device according to claim 1, characterized in that: The simulated cable is formed by connecting a plurality of resistors with specific resistance values ​​and capacitors with specific capacitance values ​​in series and in parallel, and the resistance and capacitance of a real cable are simulated through the combination of resistors and capacitors.

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