Communication test device and method for downhole instrument

Abstract

The invention discloses a communication test device and method for a downhole instrument, and the device comprises an upper computer which is used for generating first control information about a downloading instruction, and transmitting the downloading instruction to a logging instrument through controlling the rotation of a motor, so as to enable the logging instrument to execute the corresponding logging operation; the motor is used for adjusting the rotation action in real time according to the first control information and simulating the rotation working state of the logging instrument by driving the logging instrument to rotate synchronously; the logging instrument is located between the motor and the code sender and used for restoring the downloading instruction and executing the logging action according to the rotating action change characteristics of the motor, generating simulated logging data matched with the current logging action, generating second control information about the simulated logging data and sending the second control information to the motor; and the simulated logging data are transmitted to the upper computer by controlling the change of the distance between the code sender and the fixed position. According to the invention, the communication function of the rotary downhole instrument can be tested.

Description

Technical Field

[0001] The present invention belongs to the field of logging communication testing, and particularly relates to a communication testing device and method for downhole instruments. Background Art

[0002] During the drilling process, ensuring the reliability of bidirectional communication between downhole instruments and the ground is the basis for improving the success rate and efficiency of drilling operations. Therefore, after the downhole instruments are assembled, it is usually necessary to test the reliability of their functions such as signal transmission, communication, and decoding.

[0003] The prior art discloses a communication testing device and method for a rotary steerable tool, which describes a testing method based on a variable-frequency motor driving a pulse generator connected to the rotary steerable tool. This method changes the generator speed of the pulse generator through a frequency converter and realizes signal downlink by changing the generated electrical signals; the electrical signals of the rotary steerable tool are transmitted to the decoding test box through the pulse generator and a pressure sensor to realize the signal upload from electrical signal to mechanical movement and then to electrical signal. In addition, the prior art also discloses a functional and performance testing device for a rotary steerable tool in a horizontal or inclined state, which realizes simulating the horizontal drilling and directional drilling states of the rotary steerable tool under horizontal and inclined conditions, and realizes the necessary functions and performance testing of the rotary steerable tool in the above states. At the same time, it also realizes the high-precision measurement of the pushing forces of the three pushers of the rotary steerable tool and the real-time display of the feedback of the force signals, the two-way communication and power supply performance testing of the coupling transformer of the steerable tool under the condition that the mandrel of the rotary steerable tool rotates, and the function and performance testing of the force vector following and maintaining function under the condition that the non-rotating sleeve of the steerable tool rotates at a low speed.

[0004] In the process of implementing the present invention, the inventors found that, on the one hand, most of the prior art uses the actual well site method to test the communication performance of downhole instruments. However, for the reproduction of the mud circulation process in the well site, it not only consumes a large amount of funds, but also has a relatively long test cycle; on the other hand, the existing ground indoor testing technologies all have certain limitations. For example: in the aforementioned communication testing device and method for a rotary steerable tool, the test state of the instrument under test is a stationary state, and the actual situation of non-stationary states (such as rotating states) is not considered, and the finally obtained test results do not match the actual situation; while the aforementioned functional and performance testing device for a rotary steerable tool in a horizontal or inclined state focuses too much on the posture of the instrument under test and limits the co-working effect of the instrument and other tools, and the finally obtained test results also do not match the actual situation. Summary of the Invention

[0005] To solve the above problems, an embodiment of the present invention provides a communication test device for downhole instruments, including: a host computer, which is used to generate first control information about the downlink instruction, and by controlling the rotation action of the motor, send the downlink instruction to the logging instrument so that it performs corresponding logging actions; the motor, which is used to adjust the rotation action in real time according to the first control information, and simulate the rotation working state of the logging instrument by driving the logging instrument to rotate synchronously; the logging instrument, which is located between the motor and the code sender, is used to restore the downlink instruction according to the change characteristics of the rotation action of the motor and perform logging actions, and generate simulated logging data matching the current logging action, and generate second control information about the simulated logging data, and transmit the simulated logging data to the host computer by controlling the change of the distance between the code sender and the fixed position.

[0006] Preferably, the logging instrument includes: a first test sub-section, which is connected to the rotating shaft of the motor and is used to obtain the change characteristics of the rotation action of the motor in real time and restore the downlink instruction; a logging instrument main body, which is respectively connected to the first test sub-section and the second test sub-section, and is used to perform logging actions according to the restored downlink instruction and forward the restored downlink instruction to the second test sub-section; the second test sub-section, which is used to generate the simulated logging data according to the restored downlink instruction.

[0007] Preferably, the first test sub-section includes: a non-rotating ring, whose inner surface contacts the outer surface of the first test sub-section and is used to connect the data transmission path between the first test sub-section and the code sender.

[0008] Preferably, the first test sub-section is further used to directly generate the simulated logging data after restoring the downlink instruction, so as to complete the communication test of other devices except the logging instrument main body and the second test sub-section when the logging instrument main body and / or the second test sub-section is abnormal.

[0009] Preferably, the first test sub-section is further used to supply power to the logging instrument; the second test sub-section is further used to provide redundant backup guarantee for the power supply of the logging instrument.

[0010] Preferably, the logging instrument is further used to convert the simulated logging data into a binary form and generate a level signal matching the binary data; the code sender is used to perform mechanical movement according to the level change characteristics of the level signal and adjust the distance between it and the fixed position in real time.

[0011] Preferably, the communication test device further includes: a proximity switch disposed at the fixed position, which is configured to generate an alternating magnetic field that changes with the mechanical movement at the front end of the code sender, and restore the level signal according to the alternating magnetic field.

[0012] Preferably, the communication test device further includes: a decoding box located between the host computer and the proximity switch, which is configured to preprocess the restored level signal and transmit the preprocessed signal to the host computer to obtain restored analog logging data, where the preprocessing methods include but are not limited to: filtering, amplification, and level conversion.

[0013] Preferably, the first control information is a PWM signal sequence carrying timing information and rotational speed information.

[0014] In addition, the present invention also provides a communication test method for downhole instruments. The communication test method is implemented by using the communication test device for downhole instruments according to the present invention. The communication test method includes: generating, by a host computer, first control information regarding a downlink instruction to send the downlink instruction to a logging instrument by controlling the rotation of a motor, so that the logging instrument performs corresponding logging actions; the motor adjusting the rotation action in real time according to the first control information and simulating the rotating working state of the logging instrument by driving the logging instrument to rotate synchronously; using the logging instrument located between the motor and the code sender to first restore the downlink instruction according to the change characteristics of the rotation action of the motor and perform logging actions, and then generating analog logging data matching the current logging actions and generating second control information regarding the analog logging data to transmit the analog logging data to the host computer by controlling the change in the distance between the code sender and the fixed position.

[0015] Compared with the prior art, one or more embodiments of the above solutions may have the following advantages or beneficial effects:

[0016] The present invention provides a communication test device and method for downhole instruments. The communication test device uses a physical quantity related to the rotation state of the drill string (drill string rotation speed) as a medium to implement signal downlink, thereby sending a downlink instruction to a logging instrument to make it perform corresponding logging actions. Then, it uses the change in the distance between a code sender and a fixed position located between the host computer and the logging instrument as a medium to implement signal uplink, thereby uploading analog logging data to the ground. At the same time, the rotation working state of the logging instrument is simulated by driving the logging instrument to rotate synchronously by a motor. The present invention effectively simulates the actual signal transmission and actual working state of downhole instruments, can realize the test of the communication function of rotating downhole instruments, and provides technical support for obtaining communication test results consistent with the actual situation.

[0017] Other features and advantages of the present invention will be set forth in the following description, and in part will be obvious from the description, or may be learned by practice of the present invention. The objectives and other advantages of the present invention may be realized and attained by the structure particularly pointed out in the specification, claims and drawings. Description of the Drawings

[0018] The drawings are provided to further understand the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0019] Figure 1 It is a schematic diagram of the overall structure of the communication test device for downhole instruments according to an embodiment of the present application.

[0020] Figure 2 It is a schematic diagram of the specific structure of the communication test device for downhole instruments according to an embodiment of the present application.

[0021] Figure 3 It is a schematic diagram of the specific structure of the test nipple of the communication test device for downhole instruments according to an embodiment of the present application.

[0022] Figure 4 It is a signal transmission schematic diagram of the code transmitter of the communication test device for downhole instruments according to an embodiment of the present application.

[0023] Figure 5 It is a step diagram of the communication test method for downhole instruments according to an embodiment of the present application. Detailed Embodiments

[0024] The following will detail the embodiments of the present invention in conjunction with the drawings and embodiments, so as to fully understand how the present invention uses technical means to solve technical problems and achieve the realization process of technical effects for implementation. It should be noted that as long as there is no conflict, the various embodiments in the present invention and the various features in each embodiment can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0025] In addition, the steps shown in the flowchart of the drawings can be executed in a computer system such as a set of computer-executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0026] During the drilling process, ensuring the reliability of the two-way communication between downhole instruments and the ground is the basis for improving the success rate and efficiency of drilling operations. Therefore, after the downhole instruments are assembled, it is usually necessary to test the reliability of their functions such as signal transmission communication and decoding.

[0027] In the prior art, on the one hand, most of the prior art uses the actual well site method to test the communication performance of downhole instruments. However, for the reproduction of the mud circulation process in the well site, it not only costs a large amount of money, but also has a relatively long test cycle. On the other hand, the existing ground indoor test technologies all have certain limitations. For example, during the test process, the test state of the instrument under test is in a static state, and the actual situation of non-static states (such as rotational states) is not considered. Eventually, the obtained test results do not match the actual situation. Or, too much attention is paid to the attitude of the instrument under test, which limits the co-working effect of the instrument and other tools. Eventually, the obtained test results also do not match the actual situation.

[0028] Therefore, to solve the above problems, the present invention proposes a communication test device and method for downhole instruments. The communication test device uses a physical quantity related to the rotational state of the drill string (drill string rotation speed) as a medium to achieve signal downlink, so as to send the downlink command to the logging instrument to make it perform corresponding logging actions. Then, the distance change between the code sender located between the upper computer and the logging instrument and the fixed position is used as a medium to achieve signal uplink, so as to upload the simulated logging data to the ground. At the same time, the logging instrument is driven by a motor to rotate synchronously to simulate the rotational working state of the logging instrument. The present invention effectively simulates the actual signal transmission and actual working state of downhole instruments, can realize the test of the communication function of rotating downhole instruments, and provides technical support for obtaining communication test results that match the actual situation.

[0029] Example 1

[0030] Figure 1 It is a schematic diagram of the overall structure of the communication test device for downhole instruments according to an embodiment of the present application. Figure 2 It is a schematic diagram of the specific structure of the communication test device for downhole instruments according to an embodiment of the present application. The following combines Figure 1 and Figure 2 to describe the structure of the communication test device of the present invention in detail.

[0031] In this embodiment, the communication test device for downhole instruments at least includes: a host computer 10, a motor 20, and a logging instrument 30. First, the host computer 10 generates first control information regarding the downlink instruction, and by controlling the rotation action of the motor 20, the downlink instruction is sent to the logging instrument 30 to make it perform corresponding logging actions. Then, according to the first control information generated by the host computer 10, the motor 20 adjusts the rotation action in real time, and drives the logging instrument 30 to rotate synchronously to simulate the rotating working state of the logging instrument 30. Finally, the logging instrument 30 between the motor 20 and the code sender restores the downlink instruction according to the change characteristics of the rotation action of the motor 20, executes the logging action, generates simulated logging data matching the current logging action, and generates second control information regarding the simulated logging data, and by controlling the change in the distance between the code sender and the fixed position, the simulated logging data is transmitted to the host computer 10.

[0032] The host computer 10 is used to generate first control information regarding the downlink instruction, and by controlling the rotation action of the motor 20, the downlink instruction is sent to the logging instrument 30 to make it perform corresponding logging actions. Specifically, the host computer 10 generates a downlink instruction for instructing the logging instrument 30 to perform logging actions to obtain logging data, and converts the generated downlink instruction into a physical quantity related to the rotation state of the drill string (i.e., the drill string rotation speed). Then, according to the converted physical quantity, the host computer 10 configures first control information for the motor 20 to form first control information regarding the downlink instruction, so as to drive the logging instrument 30 to rotate by controlling the motor 20 to perform a specified rotation action corresponding to the converted physical quantity, so that the downlink instruction is sent to the logging instrument 30. In the embodiment of the present application, on the one hand, during the downlink process of data transmission communication, this communication test device realizes the transmission of the downlink instruction in the form of instruction coding based on the physical quantity related to the rotation state of the drill string; on the other hand, this communication test device realizes the simulation of the rotation working condition of the actual logging instrument 30 during the communication test process. That is to say, this embodiment can obtain a communication test result that conforms to the rotation working condition of the actual logging instrument 30.

[0033] In the embodiment of the present application, the first control information is a PWM signal sequence carrying timing information and speed information. Since the logging actions indicated by different downlink instructions are different, and the first control information is used to control the rotation action of the motor 20. Among them, the rotation parameters that determine the rotation action of the motor 20 are mainly timing and speed. Therefore, in this embodiment, the first control information carries timing information and speed information, and uses the PWM signal sequence as the transmission carrier of the timing information and speed information, so as to transmit the first control information from the host computer 10 to the motor 20.

[0034] In a specific embodiment of the present application, before the first control information is transmitted from the host computer 10 to the motor 20, the host computer 10 first performs binary encoding on the timing information and the rotational speed information in the encoding format of "sync header + data". Then, the binary encoded information is compiled to form a PWM signal sequence with encoding characteristics. After that, the PWM signal sequence with encoding characteristics is transmitted from the host computer 10 to the motor 20 based on the data line connected between the host computer 10 and the motor 20. It should be noted that the present invention does not specifically limit the conversion relationship between the binary encoded information and the PWM signal sequence with encoding characteristics, and those skilled in the art can set it according to the model of the motor 20 actually selected.

[0035] Next, the motor 20 is used to adjust the rotation action in real time according to the first control information, and simulate the rotation working state of the logging tool 30 by driving the logging tool 30 to rotate synchronously. In the embodiment of the present application, since the PWM signal sequence with encoding characteristics defines the timing and rotational speed of the motor 20, when the first control information reaches the motor 20, the motor 20 adjusts the rotation action in real time according to the timing information and rotational speed information carried by the first control information. Further, since the motor 20 in this embodiment is connected to the logging tool 30, when the motor 20 rotates, the logging tool 30 driven by it also rotates synchronously. Accordingly, the simulation of the rotation working state of the logging tool 30 is achieved.

[0036] In a specific embodiment of the present application, the motor 20 is a variable-frequency motor.

[0037] Further, the logging tool 30 located between the motor 20 and the code sender is used to restore the downlink instruction and execute the logging action according to the change characteristics of the rotation action of the motor 20, generate simulated logging data matching the current logging action, and generate second control information about the simulated logging data, so as to transmit the simulated logging data to the host computer 10 by controlling the distance change between the code sender and the fixed position.

[0038] Refer to Figure 2, the logging tool 30 is located between the motor 20 and the code sender. During the synchronous rotation with the motor 20, the logging tool 30 obtains the change characteristics of the rotation action of the motor 20 in real time, and thus restores the downlink instruction sent by the host computer 10 according to the reverse process of the process of forming the change characteristics of the rotation action of the motor 20, and executes the corresponding logging actions according to the restored downlink instruction. While executing the logging actions, the logging tool 30 generates simulated logging data matching the current logging actions, so as to simulate the real-time acquisition of the logging data during the rotation working process. Then, the logging tool 30 converts the generated simulated logging data into a level signal related to the numerical change, and transmits the current level signal to the code sender as the second control information about the simulated logging data. Finally, the code sender adjusts the distance from the fixed position in real time according to the second control information, so as to achieve the purpose of transmitting the simulated logging data to the host computer 10 based on the distance change.

[0039] The logging tool 30 in this embodiment is composed of the logging tool 30 main body, and the first test stub and the second test stub respectively connected to the downlink signal input end and the downlink signal output end of the logging tool 30 main body. Among them, the first test stub is connected to the rotating shaft of the motor 20, and is used to obtain the change characteristics of the rotation action of the motor 20 in real time and restore the downlink instruction; the logging tool 30 main body, which is respectively connected to the first test stub and the second test stub, is used to execute the logging actions according to the restored downlink instruction and forward the restored downlink instruction to the second test stub; the second test stub is used to generate simulated logging data according to the restored downlink instruction.

[0040] Specifically, the first test stub is connected to the rotating shaft of the motor 20. On the one hand, it realizes the synchronous rotation of the motor 20 and the logging tool 30; on the other hand, the first test stub, based on the speed sensor set inside it, collects the speed data of the motor 20 in real time to obtain the change characteristics of the rotation action of the motor 20, and then according to the obtained change characteristics of the rotation action, restores the downlink instruction according to the reverse process of forming the change characteristics of the rotation action. Then, the first test stub transmits the restored downlink instruction to the logging tool 30 main body in the form of an electrical signal. The logging tool 30 main body executes the logging actions (such as logging attitude, logging duration, etc.) according to the restored downlink instruction electrical signal, and continues to forward the restored downlink instruction electrical signal to the second test stub. Finally, the second test stub generates the corresponding simulated logging data according to the restored downlink instruction electrical signal, and performs uplink transmission of it as the measured data to be uploaded to the ground.

[0041] In a specific embodiment of the present application, the main body of the logging instrument 30 is respectively connected to the first test stub and the second test stub in a threaded connection manner, forming a tooling structure of the logging instrument 30. On the one hand, this tooling structure effectively simulates the protection function of the compressive sleeve of the downhole instrument or the housing of the mechanical equipment; on the other hand, it effectively ensures the stable state of the connection position during the rotation of the logging instrument 30, and ensures the stability of the energy and data transmission inside the entire logging instrument 30.

[0042] In the embodiment of the present application, the main body of the logging instrument 30 is respectively connected to the first test stub and the second test stub in a threaded connection manner, effectively ensuring the stable state of the connection position during the rotation of the logging instrument 30.

[0043] The first test stub is also used to directly generate simulated logging data after restoring the downlink instruction, so as to complete the communication test of other devices except the main body of the logging instrument 30 and the second test stub when the main body of the logging instrument 30 and / or the second test stub is abnormal. In the embodiment of the present application, after restoring the downlink instruction, the first test stub directly generates simulated logging data in a manner similar to that of the second test stub according to the restored downlink instruction. The simulated logging data generated by the first test stub in this embodiment provides a redundant backup guarantee for the generation of the simulated logging data of the second test stub. When the main body of the logging instrument 30 and / or the second test stub is abnormal, the simulated logging data as the measured data can still complete the uplink transmission, thus ensuring that the communication test of other devices except the main body of the logging instrument 30 and the second test stub is not affected, and effectively improving the test efficiency.

[0044] Furthermore, the first test stub is also used to supply energy to the logging instrument 30; the second test stub is also used to provide a redundant backup guarantee for the energy supply of the logging instrument 30. Specifically, rechargeable batteries and power switches are arranged inside both the first test stub and the second test stub, and on the side wall of each test stub, there is a setting interface as shown in Figure 3 for charging the battery ( Figure 3 is a schematic structural diagram of the test stub of the communication test device for downhole instruments in the embodiment of the present application). During the test, the battery in the first test stub mainly supplies energy to the logging instrument 30, and when the battery in the first test stub has insufficient power or fails, the battery in the second test stub supplies energy to the logging instrument 30, thereby providing a redundant backup guarantee for the energy supply of the logging instrument 30.

[0045] In a specific embodiment of the present application, the setting interface on the side wall of each test stub is a multi-functional interface, and is also used to perform data export (for downloading or pre-compiling) and other processing on the data in the current test stub.

[0046] In the embodiment of the present application, data transmission slip rings are respectively arranged at the connection positions between the main body of the logging instrument 30 and the first test sub-section and the second test sub-section. Among them, at the connection position between the main body of the logging instrument 30 and the first test sub-section / second test sub-section, the data transmission slip ring is in contact with both the main body of the logging instrument 30 and the first test sub-section / second test sub-section at the same time, thereby connecting the data transmission path and the power supply path between the main body of the logging instrument 30 and the first test sub-section / second test sub-section.

[0047] Furthermore, the first test sub-section is provided with a non-rotating ring. The inner surface of the non-rotating ring is in contact with the outer surface of the first test sub-section and is used to connect the data transmission path between the first test sub-section and the code transmitter. Continuing to refer to Figure 4 , in a specific embodiment of the present application, the logging instrument 30 is supported by a support platform, and the non-rotating ring is fixed to the support platform. That is to say, the outer surface of the non-rotating ring is fixedly connected to the support platform, and the inner surface is movably connected to the outer surface of the first test sub-section. Based on the foregoing setting method of the non-rotating ring, this embodiment connects the data transmission path between the first test sub-section and the code transmitter, and realizes the simulation of data transmission during the rotation working process under the condition that the communication test device does not move.

[0048] In the embodiment of the present application, the logging instrument 30 is also used to convert the simulated logging data into a binary form and generate a level signal matching the binary data; the code transmitter is used to perform mechanical movement according to the level change characteristics of the level signal and adjust the distance between it and the fixed position in real time.

[0049] Specifically, before data transmission to the code transmitter, the logging instrument 30 first converts the simulated logging data into a binary form to obtain binary logging data. Then, the logging instrument 30 converts the binary logging data into a high-level signal with coding characteristics and a level signal (a level signal matching the binary data) and transmits it to the code transmitter. Then, the code transmitter performs reciprocating mechanical movement according to the level change characteristics of the level signal, so that the distance between it and the fixed position changes in real time. It should be noted that the present invention does not specifically limit the conversion relationship between the binary logging data and the level signal with coding characteristics, and those skilled in the art can set it according to the type and quantity of the actual simulated logging data to be transmitted.

[0050] Furthermore, the communication test device is also provided with a proximity switch arranged at a fixed position. The proximity switch is used to generate an alternating magnetic field that changes with mechanical movement at the front end of the code transmitter and restore the level signal according to the alternating magnetic field. Figure 4 This is a signal transmission schematic diagram of the code transmitter of the communication test device for downhole instruments in the embodiment of the present application. Referring to Figure 4, the code generator performs mechanical motion according to the level change characteristics of the level signal. At this time, the distance between the metal head at the signal output end of the code generator and the induction surface serving as the signal input end on the proximity switch changes, and at the same time, an alternating magnetic field that changes with the mechanical motion is generated at the front end of the code generator. The proximity switch senses the alternating magnetic field and restores the level signal according to the reverse process of the generated alternating magnetic field. It can be seen that this embodiment realizes the simulation of the signal transmission between the pulse generator and the pressure sensor in the actual drilling process based on the cooperation of the code generator and the proximity switch.

[0051] Furthermore, the communication test device also includes a decoding box located between the upper computer 10 and the proximity switch. The decoding box is used to preprocess the restored level signal and transmit the preprocessed signal to the upper computer 10 to obtain the restored analog logging data. First, the decoding box preprocesses the level signal restored by the proximity switch according to the alternating magnetic field; then, it transmits the preprocessed signal to the upper computer 10; finally, the preprocessed signal is directly restored to the analog logging data generated by the test sub-section in the upper computer 10, effectively improving the data transmission efficiency and the reliability of data transmission. In the embodiments of the present application, the preprocessing methods include but are not limited to: filtering, amplification, and level conversion.

[0052] In a specific embodiment of the present application, the upper computer 10 is used to display and store the restored analog logging data.

[0053] Example 2

[0054] On the other hand, based on the communication test device for downhole instruments described in the foregoing Embodiment 1, the embodiment of the present invention also proposes a communication test method for downhole instruments (hereinafter referred to as "communication test method"), which uses the above-mentioned communication test device for downhole instruments to effectively realize the communication test of downhole instruments.

[0055] Figure 5 It is a step diagram of the communication test method for downhole instruments in the embodiments of the present application. As Figure 5As shown in the figure, the communication test method of the present invention includes the following steps: Step S510: Use the host computer to generate first control information regarding the downlink instruction, and by controlling the rotation action of the motor, send the downlink instruction to the logging instrument so that it performs corresponding logging actions; Step S520: The motor adjusts the rotation action in real time according to the first control information in Step S510, and drives the logging instrument to rotate synchronously to simulate the rotating working state of the logging instrument; Step S530: Use the logging instrument located between the motor and the encoder. First, restore the downlink instruction according to the change characteristics of the rotation action of the motor and perform the logging action, and then generate simulated logging data matching the current logging action, and generate second control information regarding the simulated logging data, and transmit the simulated logging data to the host computer by controlling the distance change between the encoder and the fixed position.

[0056] The present invention proposes a communication test device and method for downhole instruments. This communication test device uses a physical quantity related to the rotation state of the drill string (drill string rotation speed) as a medium to achieve signal downlink, thereby sending the downlink instruction to the logging instrument so that it performs corresponding logging actions. Then, it uses the distance change between the encoder and the fixed position located between the host computer and the logging instrument as a medium to achieve signal uplink, thereby uploading the simulated logging data to the ground. At the same time, the motor drives the logging instrument to rotate synchronously to simulate the rotating working state of the logging instrument. The present invention realizes the effective simulation of the actual signal transmission and actual working state of downhole instruments, can realize the test of the communication function of rotating downhole instruments, and provides technical support for obtaining communication test results consistent with the actual situation.

[0057] As mentioned above, only the preferred specific embodiments of the present invention are described, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

[0058] It should be understood that the embodiments disclosed by the present invention are not limited to the specific structures, processing steps or materials disclosed herein, but should extend to equivalent alternatives of these features understood by those of ordinary skill in the relevant art. It should also be understood that the terms used herein are only for the purpose of describing specific embodiments and do not mean to limit.

[0059] The "one embodiment" or "embodiment" mentioned in the specification means that the specific features, structures or characteristics described in combination with the embodiment are included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment" or "embodiment" appearing throughout the specification do not necessarily all refer to the same embodiment.

[0060] Although the embodiments disclosed in the present invention are as described above, the content described is only an embodiment adopted for the convenience of understanding the present invention and is not used to limit the present invention. Any person skilled in the art within the technical field to which the present invention pertains may make any modifications and changes in the form of implementation and details without departing from the spirit and scope disclosed by the present invention. However, the scope of patent protection of the present invention shall still be subject to the scope defined by the appended claims.

Claims

1. A communication test device for downhole instruments, characterized in that: include: The host computer is used to generate first control information about the downlink instruction, so as to send the downlink instruction to the logging instrument by controlling the rotation action of the motor, so that the logging instrument performs the corresponding logging action; The motor is used to adjust the rotation action in real time according to the first control information, and simulate the rotation working state of the logging instrument by driving the logging instrument to rotate synchronously; The logging instrument is located between the motor and the encoder, and is used to restore the downlink instruction and execute the logging action according to the change characteristics of the rotation action of the motor, and to generate simulated logging data matching the current logging action, and generate second control information about the simulated logging data, so as to transmit the simulated logging data to the host computer by controlling the change of the distance between the encoder and the fixed position.

2. The communication test device according to claim 1, characterized in that: The logging instrument has: A first test nipple, connected to the rotating shaft of the motor, for acquiring the rotation action change characteristics of the motor in real time and restoring the downlink instruction; A logging instrument body, which is connected to the first test sub and the second test sub, respectively, and is used to perform logging actions according to the restore and downlink instructions, and forward the restore and downlink instructions to the second test sub; The second test sub is used to generate the simulated logging data according to the restoration downlink instruction.

3. The communication test device according to claim 2, characterized in that: The first test section has: The non-rotating ring has an inner surface in contact with the outer surface of the first test short section and is used to connect the data transmission path between the first test short section and the encoder.

4. The communication test device according to claim 2 or 3, characterized in that: The first test sub is further used to directly generate the simulated logging data after restoring the downlink instruction, so as to complete the communication test of other equipment except the logging instrument body and the second test sub when the logging instrument body and / or the second test sub are abnormal.

5. The communication test device according to any one of claims 2 to 4, characterized in that: The first test sub is also used to supply energy to the logging instrument; The second test sub is also used to provide redundant backup protection for the energy supply of the logging instrument.

6. The communication test device according to any one of claims 1 to 5, characterized in that: The well logging instrument is further used to convert the analog well logging data into binary form and generate a level signal matching the binary data; The encoder is used to perform mechanical movement according to the level change characteristics of the level signal and adjust the distance between it and the fixed position in real time.

7. The communication test device according to claim 6, characterized in that: The communication test device also has: The proximity switch arranged at the fixed position is used to generate an alternating magnetic field at the front end of the encoder that changes with the mechanical movement, and restore the level signal according to the alternating magnetic field.

8. The communication test device according to claim 7, characterized in that: The communication test device also has: A decoding box is located between the host computer and the proximity switch, and is used to pre-process the restored level signal and transmit the pre-processed signal to the host computer to obtain restored simulated logging data, wherein the pre-processing method includes but is not limited to: filtering, amplification and level conversion.

9. The communication test device according to any one of claims 1 to 8, characterized in that: The first control information is a PWM signal sequence carrying timing information and speed information.

10. A communication test method for downhole instruments, characterized in that: The communication test method is implemented by using the communication test device according to any one of claims 1 to 9, wherein the communication test method comprises: The host computer generates first control information about the downlink instruction, so as to send the downlink instruction to the logging instrument by controlling the rotation action of the motor, so that the logging instrument performs the corresponding logging action; The motor adjusts the rotation action in real time according to the first control information, and simulates the rotation working state of the logging instrument by driving the logging instrument to rotate synchronously; By using the logging instrument located between the motor and the encoder, the downlink instruction is first restored and the logging action is executed according to the change characteristics of the rotation action of the motor, and then simulated logging data matching the current logging action is generated, and second control information about the simulated logging data is generated to transmit the simulated logging data to the host computer by controlling the change in the distance between the encoder and the fixed position.

Images