A downhole communication system and method of implementing the same

Abstract

The application discloses a downhole communication system and an implementation method thereof, which is used for realizing communication of logging-while-drilling equipment and rotary steering tool hanging connection, and comprises a single bus, a first type of hanging connection equipment hung on the single bus and used for occupying the single bus by using a first communication protocol, wherein data collected by the hanging connection equipment from different communication protocols is obtained in a preset complete communication period, a second type of hanging connection equipment hung on the single bus and used for occupying the single bus by using a second communication protocol, and a communication circuit hung on the single bus and used for transmitting the data collected by the second type of hanging connection equipment to the first type of hanging connection equipment through time-sharing communication with the hanging connection equipment of different communication protocols, wherein the hanging connection equipment with different communication protocols does not occupy the single bus at the same time at the same time. The application improves the hanging connection efficiency of the logging-while-drilling equipment and the rotary steering tool.

Description

Technical Field

[0001] This invention relates to the field of logging-while-drilling technology, and more specifically, to a downhole communication system and its implementation method for connecting logging-while-drilling instruments and rotary steering tools. Background Technology

[0002] Logging while drilling (LOW) and rotary steerable drilling are key technologies in modern drilling and completion. LOW is used to acquire real-time geophysical properties of downhole rocks and fluids, while rotary steerable drilling is used to precisely control the drill bit to complete complex three-dimensional wellbore trajectories, making it a crucial technology for developing complex underground oil and gas resources. LOW technology mainly includes acoustic, electrical, and nuclear logging, and is conducted immediately after drilling through the formation, when mud invasion begins. The data obtained are true values ​​of formation parameters, providing a more accurate reflection of the original formation information. Rotary steerable drilling technology can replace traditional mud motors and elbows, enabling directional drilling throughout the entire wellbore. It offers excellent adjustment and control of the wellbore trajectory, resulting in high wellbore quality, fast drilling speed, and a cleaner wellbore, thus reducing the engineering risks of directional drilling.

[0003] In practical applications, logging-while-drilling instruments and rotary steerable tools are used together to establish a closed-loop control system during drilling. When the wellbore trajectory deviates from the target formation, the logging-while-drilling instrument will promptly measure the information of the drilled formation, analyze the formation information, and feed the analysis results back to the rotary steerable tool. Then, the rotary steerable tool will promptly control the build-up angle and build-up direction to control the drill bit to re-enter the target formation.

[0004] With the development of rotary steerable tools and logging-while-drilling instruments, a wide variety of instruments and instrument upgrades have emerged. Rotary steerable tools and logging-while-drilling instruments each form their own system, with their own communication protocols and complex ground debugging systems, making it difficult to use them together.

[0005] In summary, the existing technology needs to provide a solution that can improve the connection efficiency between logging-while-drilling instruments and rotary steerable tools in order to solve one or more of the above-mentioned technical problems. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a downhole communication system for enabling communication between logging-while-drilling instruments and rotary steerable tools. The system includes: a single bus; a first type of docking device connected to the single bus, used to occupy the single bus using a first communication protocol, wherein data collected by docking devices with different communication protocols is acquired within a preset complete communication cycle; a second type of docking device connected to the single bus, used to occupy the single bus using a second communication protocol; and a communication circuit connected to all docking devices via the single bus, used to transmit data collected by the second type of docking devices to the first type of docking devices through time-division communication with docking devices using different communication protocols, wherein docking devices with different communication protocols do not occupy the single bus simultaneously.

[0007] Preferably, the complete communication cycle includes an internal communication period for the first type of attachment equipment and an external communication period for the first type of attachment equipment. The first type of attachment equipment includes a measurement while drilling instrument and a rotary steerable tool. The internal communication period for the first type of attachment equipment includes a first working period. The measurement while drilling instrument is used to obtain steerable feedback data sent from the rotary steerable tool by sequentially occupying the single bus in a time-sharing manner during the first working period.

[0008] Preferably, the measurement-while-drilling instrument is used to occupy the single bus during the first working period and send first format information containing guidance control instructions to the rotary directional tool; the rotary directional tool is used to parse the currently received information after receiving the first format information, obtain the guidance control instructions, and perform guidance actions under the control of the current instructions to generate the guidance feedback data, and finally send the first format information containing guidance feedback data information back to the measurement-while-drilling instrument.

[0009] Preferably, the second type of attachment device includes a logging-while-drilling (LWD) instrument, and the external communication time periods of the first type of attachment device include a second working time period, a third working time period, a fourth working time period, a fifth working time period, and a sixth working time period arranged sequentially. The communication circuit is used to communicate with the LWD instrument during the second working time period and with the LWD instrument during the third working time period to send logging data request commands from the LWD instrument to the LWD instrument via the communication circuit. The LWD instrument is used to complete internal communication and logging data acquisition during the fourth working time period. The communication circuit is also used to communicate with the LWD instrument during the fifth working time period and with the LWD instrument during the sixth working time period to transmit the logging data from the LWD instrument to the LWD instrument via the communication circuit.

[0010] Preferably, the logging-while-drilling instrument is used to occupy the single bus during the second working period and send first format information containing logging data request instructions to the communication circuit; the communication circuit is used to parse the first format information after receiving it, obtain the logging data request instructions, generate second format information containing logging data request instructions, and then occupy the single bus during the third working period to send the second format information containing logging data request instructions to the logging-while-drilling instrument during the third working period.

[0011] Preferably, the logging-while-drilling instrument is configured to, upon receiving second-format information from the communication circuit, parse the currently received information to obtain the logging data request instruction, and use the logging data request instruction to perform a downhole resistivity measurement task during a fourth working period to obtain the logging data, and occupy the single bus during a fifth working period to send second-format information containing logging data information to the communication circuit during the fifth working period.

[0012] Preferably, the communication circuit is configured to, upon receiving second-format information from the logging-while-drilling instrument, parse the currently received information to obtain the logging data and generate first-format information containing the logging data information, and occupy the single bus during the sixth working period to send the first-format information containing the logging data information to the logging-while-drilling instrument during the sixth working period; the logging-while-drilling instrument is configured to, upon receiving the first-format information from the communication circuit, parse the currently received information to obtain the logging data.

[0013] Preferably, the logging-while-drilling instrument includes: a resistivity master control circuit, which, after receiving the logging data request instruction, occupies the single bus during the fourth working period and sends second-format information containing acquisition instruction information to the resistivity transmitting circuit, and obtains the logging data according to the resistivity feedback signal, and generates second-format information containing the logging data, so as to output the current second-format information during the fifth working period; and a resistivity transmitting circuit, which, after receiving the second-format information sent from the resistivity master control circuit, parses the currently received information to obtain the acquisition instruction, and generates a resistivity transmitting signal under the control of the acquisition instruction, so that the resistivity master control circuit obtains the resistivity feedback signal.

[0014] Preferably, the logging-while-drilling instrument is an electromagnetic logging instrument or an acoustic logging instrument.

[0015] On the other hand, the present invention also provides a method for realizing downhole communication, the method being implemented through the downhole communication system as described above, the method comprising: connecting a first type of attachment device and a second type of attachment device to a single bus, wherein the first type of attachment device occupies the single bus using a first communication protocol, and the second type of attachment device occupies the single bus using a second communication protocol; obtaining data collected by the first type of attachment device; and transmitting the data collected by the second type of attachment device to the first type of attachment device via a communication circuit through time-division communication with attachment devices using different communication protocols, wherein attachment devices using different communication protocols do not occupy the single bus simultaneously.

[0016] Compared with the prior art, one or more embodiments of the above solutions may have the following advantages or beneficial effects:

[0017] This invention discloses a downhole communication system and its implementation method for connecting logging-while-drilling (MWD) instruments and rotary steerable tools (DSPs). Specifically, it includes connecting the MWD, MWD instrument, DSP, and communication circuitry to a single bus. The MWD and DSP communicate using P1 code, the MWD instrument uses P2 code, and the communication circuitry uses both P1 and P2 codes. P1 and P2 codes cannot be used simultaneously on the single bus. Thus, this invention achieves internal and external communication between the MWD instrument and DSP without altering their original operating conditions, improving the connection efficiency between the MWD instrument and DSP. It solves the problem of connection difficulties caused by incompatible communication protocols between the two systems, and is of great significance for improving drilling speed, drilling safety, and wellbore trajectory control.

[0018] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained by means of the structures particularly pointed out in the following description, claims, and drawings. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure of the downhole communication system according to an embodiment of this application.

[0021] Figure 2 This is a schematic diagram of the specific structure of the downhole communication system according to an embodiment of this application.

[0022] Figure 3 This is a schematic diagram of the working timing of a single bus in the downhole communication system according to an embodiment of this application.

[0023] Figure 4 This is a flowchart illustrating the communication process between the logging-while-drilling instrument 104 and the rotary steering tool 103 in the downhole communication system according to an embodiment of this application.

[0024] Figure 5 This is a step diagram of a method for implementing downhole communication according to an embodiment of this application.

[0025] In this application, all drawings are schematic and are used only to illustrate the principles of the invention, and are not drawn to scale.

[0026] The list of reference numerals in the attached figures is as follows:

[0027] 101: Single Bus

[0028] 102: Measurement While Drilling Instrument

[0029] 103: Rotary Guide Tool

[0030] 104: Logging While Drilling Instruments

[0031] 104A: Resistivity Emitting Circuit

[0032] 104B: Resistivity Main Control Circuit

[0033] 105: Communication Circuits Detailed Implementation

[0034] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples, so that the process of how the present invention uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. It should be noted that, as long as there is no conflict, the various embodiments and features in the various embodiments of the present invention can be combined with each other, and the resulting technical solutions are all within the protection scope of the present invention.

[0035] Furthermore, the steps illustrated in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Also, although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in a different order than that shown here.

[0036] Logging while drilling (LOW) and rotary steerable drilling are key technologies in modern drilling and completion. LOW is used to acquire real-time geophysical properties of downhole rocks and fluids, while rotary steerable drilling is used to precisely control the drill bit to complete complex three-dimensional wellbore trajectories, making it a crucial technology for developing complex underground oil and gas resources. LOW technology mainly includes acoustic, electrical, and nuclear logging, and is conducted immediately after drilling through the formation, when mud invasion begins. The data obtained are true values ​​of formation parameters, providing a more accurate reflection of the original formation information. Rotary steerable drilling technology can replace traditional mud motors and elbows, enabling directional drilling throughout the entire wellbore. It offers excellent adjustment and control of the wellbore trajectory, resulting in high wellbore quality, fast drilling speed, and a cleaner wellbore, thus reducing the engineering risks of directional drilling.

[0037] In practical applications, logging-while-drilling instruments and rotary steerable tools are used together to establish a closed-loop control system during drilling. When the wellbore trajectory deviates from the target formation, the logging-while-drilling instrument will promptly measure the information of the drilled formation, analyze the formation information, and feed the analysis results back to the rotary steerable tool. Then, the rotary steerable tool will promptly control the build-up angle and build-up direction to control the drill bit to re-enter the target formation.

[0038] With the development of rotary steerable tools and logging-while-drilling instruments, a wide variety of instruments and instrument upgrades have emerged. Rotary steerable tools and logging-while-drilling instruments each form their own system, with their own communication protocols and complex ground debugging systems, making it difficult to use them together.

[0039] Therefore, to solve one or more of the above-mentioned technical problems, this invention discloses a downhole communication system and its implementation method. This system and method are used to realize communication between logging-while-drilling (MWD) instruments and rotary steerable tools in a docking scenario. Specifically, it includes docking a MWD instrument, a MWD instrument, a rotary steerable tool, and a communication circuit on a single bus. The MWD and the rotary steerable tool communicate using P1 code, the MWD instrument uses P2 code, and the communication circuit uses both P1 and P2 codes. At the same time, P1 and P2 codes cannot be used simultaneously on the single bus, otherwise it will cause communication congestion. In this way, this invention completes communication using multiple codes on a single bus, realizing communication between the internal and external systems of the MWD instrument, thereby improving the docking efficiency between the MWD instrument and the rotary steerable tool.

[0040] Figure 1 This is a schematic diagram of the overall structure of the downhole communication system according to an embodiment of this application. Figure 1 As shown, the downhole communication system described in this embodiment of the invention is used to realize communication between logging-while-drilling instruments and rotary steerable tools in a docking scenario. The downhole communication system includes: a single bus 101, at least one type of first-class docking device (unnumbered), at least one type of second-class docking device (unnumbered), and a communication circuit 105.

[0041] A first type of connected device is connected to the single bus 101. This first type of connected device is used to occupy the single bus 101 using a first communication protocol. A second type of connected device is connected to the single bus 101. This second type of connected device is used to occupy the single bus using a second communication protocol. A communication circuit 105 is connected to the single bus 101. Furthermore, the communication circuit 105 communicates with each connected device via the single bus 101.

[0042] like Figure 1 As shown, Figure 1 The solid arrows in the diagram represent the actual connections and communication relationships between the single bus and different connected devices, and between the single bus and communication circuits. Figure 1 The dashed arrows indicate the flow of data and command information between different devices. The first type of connected device is also used to acquire data collected by connected devices with different communication protocols within a preset complete communication cycle. In other words, the first type of connected device can acquire not only data transmitted between devices with the same internal communication protocol, but also data collected by the second type of connected device with a different communication protocol.

[0043] Furthermore, the communication circuit 105 is used to transmit data collected by the second type of connected devices to the first type of connected devices after format conversion processing through time-division communication with connected devices using different communication protocols. Specifically, connected devices with different communication protocols do not simultaneously occupy the single bus. The communication circuit 105 can support communication with multiple connected devices using different communication protocols. Therefore, the time-division communication described in this embodiment refers to the communication circuit 105 occupying the single bus 101 at any given time by communicating only with one type of connected device, thereby achieving bidirectional communication between the first type of connected devices and the second type of connected devices through the communication circuit 105 acting as an intermediate medium.

[0044] Figure 2 This is a schematic diagram of the specific structure of the downhole communication system according to an embodiment of this application. The following refers to... Figure 2 The internal structure of the downhole communication system in this invention will be described. In this embodiment, the first type of attachment equipment includes a measurement while drilling (MWD) instrument 102 and a rotary steerable tool 103. The second type of attachment equipment includes a logging while drilling instrument 104.

[0045] like Figure 2 As shown, an MWD 102, a rotary steerable tool 103, a logging-while-drilling instrument 104, and a communication circuit 105 are connected to a single bus 101. Both the MWD 102 and the rotary steerable tool 103 communicate using a first communication protocol, i.e., using P1 codes. The logging-while-drilling instrument 104 communicates using a second communication protocol, i.e., using P2 codes. The communication circuit 105 supports multiple communication protocols (i.e., it can use either P1 or P2 codes), thus allowing the communication circuit 105 to communicate with all connected devices on the single bus 101.

[0046] It should be noted that, in this embodiment of the invention, the type of logging-while-drilling instrument 104 is not specifically limited, and those skilled in the art can set it according to actual needs. The logging-while-drilling instrument 104 can be an electromagnetic logging instrument or an acoustic logging instrument. (Reference) Figure 2 The logging-while-drilling instrument 104 includes a resistivity transmitting circuit 104A and a resistivity main control circuit 104B. Both the resistivity transmitting circuit 104A and the resistivity main control circuit 104B are connected to a single bus 101. Furthermore, the resistivity transmitting circuit 104A and the resistivity main control circuit 104B communicate using P2 code.

[0047] During formation resistivity measurement, the resistivity master control circuit 104A first sends an acquisition command to the resistivity transmitting circuit 104B. Then, upon receiving the acquisition command, the resistivity transmitting circuit 104B generates a resistivity transmission signal (e.g., ultrasonic signal or electromagnetic field signal) under its control, sending the resistivity transmission signal to the formation being measured. This allows the resistivity master control circuit 104A to obtain a resistivity feedback signal (resistivity receiving signal) from the formation. After obtaining the resistivity feedback signal, the resistivity master control circuit 104A obtains logging data based on the currently acquired resistivity feedback signal. Thus, the logging-while-drilling instrument 104 completes the formation resistivity measurement task.

[0048] Figure 3 This is a timing diagram illustrating the operation of a single bus in a downhole communication system according to an embodiment of this application. The following is in conjunction with... Figure 3 The operating timing of the single bus in this embodiment of the invention will be described. In this example, the complete communication cycle is the complete operating cycle of the single bus, specifically including: the internal communication period of the first type of connected device and the external communication period of the first type of connected device.

[0049] refer to Figure 3 The internal communication period of the first type of connected equipment includes the first working period T1. The external communication period of the first type of connected equipment includes the second working period T2, the third working period T3, the fourth working period T4, the fifth working period T5, and the sixth working period T6, which are arranged sequentially in time sequence.

[0050] Specifically, during the first working period T1, the measurement-while-drilling (MWD) instrument 102 is used to acquire guidance feedback data sent from the rotary steerable tool 103 by sequentially occupying the single bus 101 in a time-sharing manner with the rotary steerable tool 103. Then, the communication circuit 105 is used to communicate only with the MWD instrument 102 during the second working period and only with the logging-while-drilling instrument 104 during the third working period, to send logging data request commands from the MWD instrument 102 to the logging-while-drilling instrument 104 via the communication circuit 105. Next, the logging-while-drilling instrument 104 is used to complete internal communication and logging data acquisition during the fourth working period. Finally, the communication circuit 105 is also used to communicate only with the logging-while-drilling instrument 104 during the fifth working period and only with the MWD instrument 102 during the sixth working period, to transmit the logging data acquired by the logging-while-drilling instrument 104 from the logging-while-drilling instrument 104 to the MWD instrument 102 via the communication circuit 105.

[0051] like Figure 3As shown, the complete working cycle of the single bus includes seven working sequences: ① During time T1, MWD102 occupies the single bus 101, communicates with the rotary steering tool 103, and sends a P1 code containing steering control commands to the rotary steering tool 103; ② During time T1, MWD102 occupies the single bus 101, receives the P1 code and continues to communicate with the rotary steering tool 103. The rotary steering tool 103 generates steering feedback data when performing steering actions, and then sends a P1 code containing steering feedback data information to MWD102; ③ During time T2, MWD102 continues to occupy the single bus 101, communicates with the communication circuit 105, and sends a P1 code containing logging data request commands to the communication circuit 105 to request logging data; ④ During time T3, the communication circuit 105 occupies the single bus 101, and the communication circuit 105 communicates with the electrical circuit in the logging-while-drilling instrument 104. The resistivity master control circuit 104B communicates and sends a P2 code containing a logging data request instruction to the resistivity instrument master control circuit 104B to request logging data; ⑤ During time T4, the logging-while-drilling instrument (resistivity instrument) 104 occupies the single bus 101 and uses the P2 code to complete the internal communication between the resistivity transmitting circuit 104A and the resistivity master control circuit 104B and the acquisition and measurement of logging data; ⑥ During time T5, the logging-while-drilling instrument 104 continues to occupy the single bus 101, and the logging-while-drilling instrument 104 communicates with the communication circuit 105. The logging-while-drilling instrument 104 returns a P2 code containing logging data information to the communication circuit 105 to submit the logging data; ⑦ During time T6, the communication circuit 105 occupies the single bus 101, and the communication circuit 105 communicates with the MWD102. The communication circuit 105 returns a P1 code containing logging data information to the MWD102 to submit the logging data.

[0052] Figure 4 This is a flowchart illustrating the communication process between the logging-while-drilling instrument 104 and the rotary steerable tool 103 in the downhole communication system according to an embodiment of this application. (Reference) Figure 4 Within a complete communication cycle, the communication mechanisms and functions of each internal component in the downhole communication system will be explained in detail.

[0053] During the first working time period T1:

[0054] The measurement-while-drilling (MWD) instrument 102 occupies the single bus 101 during the first working period T1 and communicates with the rotary steerable tool 103. During this period, it sends first-format information, including steerable control command information, to the rotary steerable tool. This first format is an information transmission format formed according to a first communication protocol. Upon receiving the first-format information (containing steerable control commands), the rotary steerable tool 103 parses the received information to obtain the steerable control commands. Under the control of these commands, it executes steerable actions, generating steerable feedback data. Finally, it feeds back the first-format information, including the steerable feedback data, to the MWD instrument 103.

[0055] Thus, during the first working period, the rotary directional control and feedback of directional data information within the MWD were completed by the sequential occupation of the single bus 101 by the measurement while drilling (MWD) 102 and the rotary directional tool 103, thereby realizing the internal communication of the MWD instrument.

[0056] During the second working period T2:

[0057] The measurement-while-drilling (MWD) instrument 102 occupies the single bus 101 during the second working period and communicates with the communication circuit 105. During this period, it sends first-format information, including logging data request instructions, to the communication circuit 105. Upon receiving the first-format information (containing the logging data request instructions), the communication circuit 105 parses the received first-format information to obtain the logging data request instructions and generates second-format information containing these instructions, awaiting the arrival of the third working period. The second format is an information transmission format formed according to a second communication protocol.

[0058] Then, during the third workroom time period T3:

[0059] The communication circuit 105 is also used to occupy the single bus during the third working period and communicate with the logging-while-drilling instrument 104 to send second-format information containing logging data request instructions to the logging-while-drilling instrument 104 during the third working period.

[0060] At this time, the logging-while-drilling instrument 104 (resistivity main control circuit 104B in it) is also used to parse the currently received information (containing the second format information of logging data request instruction) sent from the communication circuit 105 after receiving it, to obtain the logging data request instruction, in order to wait for the arrival of the fourth working time period, and to use the logging data request instruction to perform the downhole resistivity measurement task during the fourth working time period, thereby obtaining logging data.

[0061] During the fourth working period T4:

[0062] The resistivity master control circuit 104B, upon receiving a logging data request command, occupies a single bus during the fourth working period and communicates with the resistivity transmitting circuit 104A. Specifically, it sends second-format information containing the acquisition command to the resistivity transmitting circuit 104A. The resistivity transmitting circuit 104A, upon receiving the second-format information from the resistivity master control circuit 104B, parses the received information to obtain the acquisition command and generates a resistivity transmission signal under the control of the acquisition command, enabling the resistivity master control circuit 104B to obtain a resistivity feedback signal. At this time, the resistivity master control circuit 104B also obtains the resistivity feedback signal from the tested formation during the fourth working period and, based on the resistivity feedback signal, determines the logging data that needs to be transmitted to the surface, thereby generating second-format information containing the logging data to await the arrival of the fifth working period, and then outputs the second-format information containing the logging data during the fifth working period.

[0063] During the fifth working period T5:

[0064] The logging-while-drilling instrument 104 (with resistivity control circuit 104B) is also used to occupy the single bus 101 during the fifth working period and communicate with the communication circuit 105, wherein the second format information containing logging data information is sent to the communication circuit 105 during the fifth working period.

[0065] At this time, the communication circuit 105 is also used to parse the currently received information after receiving the second format information sent from the logging-while-drilling instrument 104, obtain logging data, and generate first format information containing logging data information in order to wait for the arrival of the sixth working time period.

[0066] During the sixth working period T6:

[0067] The communication circuit 105 is also used to occupy the single bus 101 during the sixth working period and communicate with the measurement-while-drilling instrument 102. During the sixth working period, it sends first-format information, including logging data, to the measurement-while-drilling instrument 102. At this time, the measurement-while-drilling instrument 102 is also used to parse the currently received information after receiving the first-format information from the communication circuit 105 to obtain logging data.

[0068] Thus, during the second to sixth working periods, the resistivity measurement control outside the MWD and the feedback of logging data information were completed through the time-division multiplexing of the single bus 101 by the MWD instrument 102, the communication circuit 105, and the logging instrument 104, realizing the external communication of the MWD instrument.

[0069] Further reference Figure 4 The communication process between the logging-while-drilling instrument 104 and the rotary steering tool 103 is described below.

[0070] like Figure 4 As shown, after the downhole communication system is powered on, (301) MWD102 is initialized, (302) rotary guide tool 103 is initialized, (303) resistivity transmitter circuit 104A is initialized, (304) resistivity main control circuit 104B is initialized, and (305) communication circuit 105 is initialized.

[0071] (3011) MWD102 communicates with the rotary guide tool 103. (3012) Sets a waiting time T1. (3013) MWD102 sends a P1 code (first format information) containing the rotary guide tool address and control command information. (3014) MWD102 determines whether the waiting time is greater than T1. If not, (3015) it checks whether it has received a P1 code containing feedback information from the rotary guide tool 103. If yes, (3016) it ends communication with the rotary guide tool. (3015) MWD102 determines whether it has received a P1 code containing feedback information from the rotary guide tool 103. If yes, (3016) it ends communication with the rotary guide tool. Otherwise, (3014) it returns to MWD to determine whether the waiting time is greater than T1.

[0072] (3017) MWD102 communicates with communication circuit 105, (3018) sets the waiting time T2, (3019) sends P1 code containing communication circuit address and logging data request instruction information, (30110) releases single bus, (30111) MWD determines whether the waiting time is greater than T2. ​​If it is, then (30112) MWD102 sets the waiting time T3+T4+T5+T6. If not, then continue (30111) MWD102 determines whether the waiting time is greater than T2. (30113)MWD102 determines whether the waiting time is greater than T3+T4+T5+T6. If so, (30115)MWD102 ends the communication with the communication circuit 105. If not, (30114)MWD102 determines whether the P1 code of the feedback information of the communication circuit 105 is received. If so, (30115)MWD102 ends the communication with the communication circuit 105. If not, (30113)MWD102 determines whether the waiting time is greater than T3+T4+T5+T6.

[0073] (3021) Rotary guide tool 103 waits for P1 code, (3022) Rotary guide tool 103 receives P1 code from MWD, (3023) Receives rotary guide control command information, (3024) Performs guide actions such as pushing and leaning, (3025) Rotary guide tool 103 generates feedback information, (3026) Rotary guide tool 103 sends feedback information to MWD102.

[0074] (305) Communication circuit 105 initializes; (3051) Communication circuit 105 waits for P1 code; (3052) Communication circuit 105 receives P1 code containing communication circuit address and logging data request instruction information; (3053) Converts P1 code to P2 code; (3054) Starts communication with resistivity instrument 104. (3055) Communication circuit 105 sets waiting time T3+T4+T5; (3056) Sends P2 code containing resistivity control circuit address and logging data request instruction information. (3057) Communication circuit 105 determines whether the waiting time is greater than T3+T4+T5. If so, (3059) communication with resistivity instrument 104 ends; otherwise, (3058) it determines whether a P2 code containing resistivity feedback information (a P2 code containing logging data information) has been received. (3058) Communication circuit 105 determines whether it has received the P2 code of feedback information. If so, (3059) it terminates communication with resistivity instrument 104; otherwise, it returns and (3057) communication circuit 105 determines whether the waiting time is greater than T3+T4+T5. (30510) Communication circuit 105 generates feedback information and (30511) converts the P2 code to the P1 code. (30512) Communication circuit 105 starts communicating with MWD102, (30513) communication circuit 105 sends the P1 code containing resistivity feedback information, and (30514) releases the single bus.

[0075] (304) The resistivity main control circuit 104B initializes, (3041) waits for the P2 code, (3042) receives the P2 code containing the address of the resistivity control circuit and the logging data request instruction information, (3043) receives the logging data request instruction information. (3044) The resistivity main control circuit 104B starts communicating with the resistivity transmitting circuit 104A, (3045) sets the waiting time T4, (3046) starts collecting logging data, (3047) sends the P2 code containing the address of the resistivity transmitting circuit and the collection instruction information. (3048) The resistivity main control circuit 104B determines whether the waiting time is greater than T4. If it is, (3049) it stops collecting data; otherwise, it returns to (3048) determining whether the waiting time is greater than T4. (30410) The resistivity main control circuit 104B generates logging data feedback information, (30411) sends the P2 code of resistivity feedback information (containing the P2 code of logging data), and (30412) releases the single bus.

[0076] (303) Initialize the resistivity transmitter circuit 104A, (3031) wait for P2 code, (3032) receive P2 code containing the resistivity transmitter circuit address and acquisition command information, (3033) receive acquisition command, (3034) execute formation resistivity measurement action.

[0077] On the other hand, based on the aforementioned downhole communication system, this embodiment of the invention also provides a method for implementing the downhole communication system (hereinafter referred to as the "downhole communication method"). This downhole communication method utilizes the downhole communication system as described above.

[0078] Figure 5 This is a step diagram illustrating a method for implementing downhole communication according to an embodiment of this application. Figure 5 As shown, the downhole communication method described in this embodiment of the invention includes the following steps:

[0079] Step S501: Connect the first type of connected device and the second type of connected device to a single bus, wherein the first type of connected device uses the first communication protocol to occupy the single bus, and the second type of connected device uses the second communication protocol to occupy the single bus.

[0080] Step S502: Obtain data collected from inside the second type of mounting device;

[0081] Step S503: The communication circuit transmits the data collected by the second type of connected devices to the first type of connected devices through time-division communication with connected devices using different communication protocols. Specifically, at any given time, connected devices with different communication protocols do not simultaneously occupy a single bus.

[0082] Therefore, the first type of attachment device described in this embodiment of the invention can not only obtain the data transmitted between devices with the same internal communication protocol, but also obtain the data collected by the second type of attachment device with a different communication protocol.

[0083] This invention proposes a downhole communication system and its implementation method for connecting logging-while-drilling (MWD) instruments and rotary steerable tools (DSPs). Specifically, it includes connecting the MWD, MWD instrument, DSP, and communication circuitry to a single bus. The MWD and DSP communicate using P1 code, the MWD instrument uses P2 code, and the communication circuitry uses both P1 and P2 codes. P1 and P2 codes cannot be used simultaneously on the single bus. Thus, this invention achieves internal and external communication between the MWD instrument and DSP without altering their original operating conditions, improving the connection efficiency between the MWD instrument and DSP. It solves the problem of connection difficulties caused by incompatible communication protocols between the two systems, and has significant implications for improving drilling speed, drilling safety, and wellbore trajectory control.

[0084] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

[0085] It should be understood that the embodiments disclosed herein are not limited to the specific structures, processing steps, or materials disclosed herein, but should be extended to equivalent substitutions of these features as understood by those skilled in the art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0086] The phrase "an embodiment" or "an embodiment" used in this specification means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Therefore, the phrase "an embodiment" or "an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0087] While the embodiments disclosed in this invention are as described above, the content is merely for the purpose of facilitating understanding of the invention and is not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and changes in form and detail of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection of this invention shall still be determined by the scope defined in the appended claims.

Claims

1. An underground communication system, characterized in that, The system is used to enable communication between logging-while-drilling instruments and rotary steerable tools, and the system includes: Single bus; The first type of attachment device is attached to the single bus and is used to occupy the single bus using a first communication protocol. It acquires data collected by attachment devices with different communication protocols within a preset complete communication cycle. The first type of attachment device includes a measurement while drilling instrument and a rotary directional tool. The second type of attachment device is attached to the single bus and is used to occupy the single bus using the second communication protocol. The second type of attachment device includes logging-while-drilling instruments. A communication circuit, connected to all connected devices via the single bus, is used to transmit data collected by the second type of connected devices to the first type of connected devices through time-division communication with connected devices using different communication protocols. Specifically, at any given time, connected devices with different communication protocols do not simultaneously occupy the single bus. The complete communication cycle includes an internal communication period for the first type of connected devices and an external communication period for the first type of connected devices. The measurement while drilling instrument is used to send guidance control commands to the rotary directional tool and then obtain guidance feedback data sent by the rotary directional tool in a way that the measurement while drilling instrument and the rotary directional tool occupy the single bus in a time-sharing manner during the first working period of the communication period within the first type of docking equipment. The external communication time periods of the first type of connected device include the second to sixth working time periods arranged sequentially, wherein, The communication circuit is also used to communicate only with the measurement-while-drilling instrument currently occupying the single bus during the second working period, and then occupy the single bus and communicate only with the logging-while-drilling instrument during the third working period, so as to send the logging data request command from the measurement-while-drilling instrument to the logging-while-drilling instrument through the communication circuit. The logging-while-drilling instrument is also used to occupy the single bus during the fourth working period and complete internal instrument communication and logging data acquisition. The communication circuit is also used to communicate only with the logging-while-drilling instrument currently occupying the single bus during the fifth working period, and then occupy the single bus and communicate only with the measurement-while-drilling instrument during the sixth working period, so as to transmit the logging data from the logging-while-drilling instrument to the measurement-while-drilling instrument through the communication circuit.

2. The downhole communication system according to claim 1, characterized in that, The measurement while drilling instrument is used to occupy the single bus during the first working period and send first format information containing guidance control instructions to the rotary guide tool. The rotary guide tool is used to parse the received information after receiving the first format information, obtain the guide control command, and perform guide actions under the control of the current command to generate the guide feedback data. Finally, it sends the first format information containing the guide feedback data information back to the measurement while drilling instrument.

3. The downhole communication system according to claim 1, characterized in that, The measurement while drilling instrument is used to occupy the single bus during the second working period and send first format information containing logging data request instructions to the communication circuit; The communication circuit is used to parse the received first format information to obtain the logging data request instruction, and generate second format information containing the logging data request instruction information. Then, during the third working period, it occupies the single bus to send the second format information containing the logging data request instruction to the logging-while-drilling instrument during the third working period.

4. The downhole communication system according to claim 3, characterized in that, The logging-while-drilling instrument is used to parse the currently received information after receiving the second format information sent from the communication circuit to obtain the logging data request instruction, and to perform downhole resistivity measurement tasks using the logging data request instruction during the fourth working period to obtain the logging data, and to occupy the single bus during the fifth working period to send the second format information containing logging data information to the communication circuit during the fifth working period.

5. The downhole communication system according to claim 4, characterized in that, The communication circuit is used to parse the currently received information after receiving the second format information sent from the logging-while-drilling instrument, obtain the logging data, generate the first format information containing the logging data information, and occupy the single bus during the sixth working period to send the first format information containing the logging data information to the logging-while-drilling instrument during the sixth working period. The measurement while drilling instrument is used to parse the currently received information after receiving the first format information sent from the communication circuit to obtain the logging data.

6. The downhole communication system according to claim 4, characterized in that, The logging-while-drilling instrument includes: The resistivity master control circuit is used to occupy the single bus during the fourth working period after receiving the logging data request instruction, and send the second format information containing the acquisition instruction information to the resistivity transmitting circuit, and obtain the logging data according to the resistivity feedback signal, and generate the second format information containing the logging data, so as to output the current second format information during the fifth working period. The resistivity transmitting circuit is used to parse the currently received information after receiving the second format information sent from the resistivity master control circuit, obtain the acquisition command, and generate a resistivity transmitting signal under the control of the acquisition command, so that the resistivity master control circuit can obtain the resistivity feedback signal.

7. The downhole communication system according to claim 6, characterized in that, The logging-while-drilling instrument is an electromagnetic logging instrument or an acoustic logging instrument.

8. A method for implementing downhole communication, characterized in that, The method is implemented using a downhole communication system as described in any one of claims 1 to 7, and the method includes: The first type of connected device and the second type of connected device are connected to a single bus, wherein the first type of connected device uses a first communication protocol to occupy the single bus, and the second type of connected device uses a second communication protocol to occupy the single bus. Obtain data collected by the first type of connected device; The communication circuit transmits the data collected by the second type of connected device to the first type of connected device through time-division communication with connected devices using different communication protocols. At the same time, connected devices with different communication protocols do not occupy the single bus simultaneously.

Images