A drilling monitoring system with downhole fault warning function

Abstract

This application relates to a drilling monitoring system with a downhole fault warning function, belonging to the technical field of underground exploration and development. The system includes an engineering parameter measurement subsystem. The engineering parameter measurement subsystem: a surface engineering parameter logging device for real-time monitoring of surface engineering parameters; a downhole engineering parameter measurement-while-drilling device, which includes: a downhole engineering parameter macro monitoring sub-device for real-time monitoring of the overall engineering parameters of downhole drill bits and drill tools; a downhole fault precise monitoring sub-device for real-time monitoring of the local engineering parameters of specified downhole components; and a downhole fault warning sub-device for performing fault feature analysis based on surface engineering parameters and downhole real-time measured engineering parameters and generating downhole fault warning signals. This application integrates macro monitoring and precise monitoring, monitors downhole fault conditions, gives timely alarms, provides guarantee for downhole exploration work, and effectively improves the accuracy of fault judgment.

Description

Technical Field

[0001] This application relates to the technical field of underground exploration and development, and specifically relates to a drilling monitoring system with a downhole fault warning function. Background Art

[0002] During the process of underground resource drilling, real-time monitoring of downhole engineering parameters and downhole faults plays an important role in the safe and efficient implementation of drilling operations. The conventional drilling monitoring and control system is that the driller control system adjusts the construction parameters of the drilling rig execution system by real-time monitoring of the changes in surface mechanical drilling speed, drilling pressure, torque and other engineering parameters.

[0003] However, there are significant differences between the actual downhole drilling conditions and the surface monitoring results, which makes it difficult for the driller to correctly adjust the drilling parameters, thus affecting the drilling efficiency. For example, in extended reach wells or horizontal wells, due to large formation friction and severe weight transfer, it is difficult for the driller to adjust the drilling pressure; another example is that when there are interlayers in the formation, it causes uneven bit rotation speed, and even drill string stall, while the surface rotation speed does not change much, and the driller has difficulty judging the downhole conditions and adjusting the drilling parameters.

[0004] At the same time, the conventional drilling monitoring and control system only monitors downhole faults based on the changes in surface engineering parameters, with a relatively high false alarm rate and missed alarm rate, and it is difficult to give an early warning at the initial stage of the fault. Often, when the surface parameters change, the fault has already formed, and in severe cases, drilling accidents occur. The conventional drilling monitoring and control system belongs to the category of surface monitoring systems, and it is impossible to accurately judge the specific failure forms of downhole bits and drill strings, and it is difficult to adjust the drilling construction parameters specifically, resulting in relatively low drilling safety.

[0005] In order to solve the above technical problems, a drilling monitoring system with a downhole fault warning function is provided now to meet the current usage requirements. Summary of the Invention

[0006] This application provides a drilling monitoring system with a downhole fault warning function, which integrates macroscopic monitoring and precise monitoring, monitors the downhole fault conditions, gives timely alarms, provides guarantee for downhole exploration work, and effectively improves the accuracy rate of fault judgment.

[0007] In a first aspect, this application provides a drilling monitoring system with a downhole fault warning function, and the system includes an engineering parameter measurement subsystem, and the engineering parameter measurement subsystem includes:

[0008] A surface engineering parameter logging device, which is used to monitor surface engineering parameters in real time;

[0009] A downhole engineering parameter measurement-while-drilling device, and the downhole engineering parameter measurement-while-drilling device includes:

[0010] The downhole engineering parameter macro monitoring sub-device is used to monitor the overall engineering parameters of the downhole drill bit and drill string in real time;

[0011] The downhole fault precise monitoring sub-device is used to monitor the local engineering parameters of specified downhole components in real time;

[0012] The downhole fault warning sub-device is used to perform fault feature analysis based on the surface engineering parameters and downhole real-time measured engineering parameters, and generate a downhole fault warning signal; wherein,

[0013] The downhole real-time measured engineering parameters include the overall engineering parameters and the local engineering parameters.

[0014] Furthermore, the system further includes:

[0015] The driller control subsystem is used to generate a rig adjustment instruction according to the surface engineering parameters, the downhole real-time measured engineering parameters, the downhole fault warning signal, the drilling design parameters, the geological environment parameters, and the adjacent well database.

[0016] Furthermore, the system further includes:

[0017] The rig execution subsystem is used to control the rig actuator according to the rig adjustment instruction.

[0018] Furthermore, the system further includes:

[0019] The data transmission subsystem is used to transmit the surface engineering parameters, the downhole real-time measured engineering parameters, and the downhole fault warning signal to the driller control subsystem.

[0020] Specifically, the downhole engineering parameter macro monitoring sub-device includes a near-bit monitoring sub-joint or a far-bit monitoring sub-joint:

[0021] The near-bit monitoring sub-joint is used to detect the engineering parameters at the drill bit;

[0022] The far-bit monitoring sub-joint is used to detect the engineering parameters at the drill string.

[0023] Specifically, both the near-bit monitoring sub-joint and the far-bit monitoring sub-joint are equipped with a weight-on-bit sensor, a rotary speed sensor, a torque sensor, a bending stress sensor, and a vibration acceleration sensor.

[0024] Specifically, when the downhole engineering parameter macro monitoring sub-device includes the near-bit monitoring sub-joint and does not include the far-bit monitoring sub-joint, the downhole engineering parameter macro monitoring sub-device further includes a measurement data receiving sub-joint;

[0025] The near-bit monitoring sub-joint is located between the drill bit and the positive displacement motor;

[0026] The measurement data receiving sub-joint is located above the positive displacement motor.

[0027] Specifically, when the downhole engineering parameter macroscopic monitoring sub-device includes the near-bit monitoring sub-joint and the far-bit monitoring sub-joint;

[0028] The near-bit monitoring sub-joint is located between the bit and the positive displacement motor;

[0029] The far-bit monitoring sub-joint is located above the positive displacement motor.

[0030] Specifically, the downhole fault precise monitoring sub-device includes a bit fault precise monitoring sub-device or a drill string fault precise monitoring sub-device;

[0031] The bit fault precise monitoring sub-device is used to monitor the fault condition of the bit in real time;

[0032] The drill string fault precise monitoring sub-device is used to monitor the fault condition of the drill string in real time.

[0033] Preferably, the downhole fault warning sub-device configures a fault grading algorithm, sets different level threshold values according to the preset fault grading standard, performs fault grading processing according to the surface engineering parameters and the downhole real-time measured engineering parameters, and issues a fault warning signal corresponding to the level.

[0034] The beneficial effects brought by the technical solution provided by this application include:

[0035] This application integrates macroscopic monitoring and precise monitoring, monitors the downhole fault condition, and gives an alarm in time, providing guarantee for downhole exploration work and effectively improving the accuracy of fault judgment. Brief Description of the Drawings

[0036] Term Explanation:

[0037] MWD: Measure While Drilling, measurement while drilling.

[0038] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0039] Figure 1 It is a schematic structural diagram of a drilling monitoring system with a downhole fault warning function provided in the embodiments of this application;

[0040] Figure 2 It is a structural block diagram of the downhole engineering parameter macroscopic monitoring sub-device of the drilling monitoring system with downhole fault warning function provided in the embodiment of the present application;

[0041] Figure 3 It is a structural block diagram of the downhole fault precise monitoring sub-device of the drilling monitoring system with downhole fault warning function provided in the embodiment of the present application;

[0042] Figure 4 It is an implementation schematic diagram of the drilling monitoring system with downhole fault warning function provided in the embodiment of the present application in the first case;

[0043] Figure 5 It is an implementation schematic diagram of the drilling monitoring system with downhole fault warning function provided in the embodiment of the present application in the second case;

[0044] Figure 6 It is an implementation schematic diagram of the drilling monitoring system with downhole fault warning function provided in the embodiment of the present application in the third case;

[0045] Figure 7 It is an implementation schematic diagram of the drilling monitoring system with downhole fault warning function provided in the embodiment of the present application in the fourth case;

[0046] In the figure:

[0047] 1. Engineering parameter measurement subsystem; 10. Surface engineering parameter logging device; 11. Downhole engineering parameter measurement-while-drilling device; 110. Downhole engineering parameter macroscopic monitoring sub-device; 1100. Near-bit monitoring sub-joint; 1101. Far-bit monitoring sub-joint; 1102. Measurement data receiving sub-joint; 111. Downhole fault precise monitoring sub-device; 1110. Bit fault precise monitoring sub-device; 1111. Drill string fault precise monitoring sub-device; 112. Downhole fault warning sub-device; 2. Driller control subsystem; 3. Drilling rig execution subsystem; 4. Data transmission subsystem; A. Bit; B. Positive displacement motor; C. MWD system. Detailed implementation manners

[0048] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0049] The following further elaborates on the embodiments of the present application with reference to the accompanying drawings.

[0050] The embodiment of the present application provides a drilling monitoring system with a downhole fault warning function, which integrates macroscopic monitoring and precise monitoring, monitors the downhole fault situation, gives an alarm in time, provides guarantee for downhole exploration work, and effectively improves the accuracy rate of fault judgment.

[0051] To achieve the above technical effects, the general idea of the present application is as follows:

[0052] A drilling monitoring system with a downhole fault warning function, the system includes an engineering parameter measurement subsystem 1, and the engineering parameter measurement subsystem 1 includes:

[0053] A surface engineering parameter logging device 10, which is used to monitor surface engineering parameters in real time;

[0054] A downhole engineering parameter measurement-while-drilling device 11, and the downhole engineering parameter measurement-while-drilling device 11 includes:

[0055] A downhole engineering parameter macroscopic monitoring sub-device 110, which is used to monitor the overall engineering parameters of the downhole drill bit and drill string in real time;

[0056] A downhole fault precise monitoring sub-device 111, which is used to monitor the local engineering parameters of specified downhole components in real time;

[0057] A downhole fault warning sub-device 112, which is used to perform fault feature analysis according to the surface engineering parameters and downhole real-time measured engineering parameters, and generate a downhole fault warning signal; wherein,

[0058] The downhole real-time measured engineering parameters include the overall engineering parameters and the local engineering parameters.

[0059] The following further describes the embodiments of the present application in detail with reference to the accompanying drawings.

[0060] In the first aspect, referring to Figures 1 to 7 as shown, the embodiment of the present application provides a drilling monitoring system with a downhole fault warning function, the system includes an engineering parameter measurement subsystem 1, and the engineering parameter measurement subsystem 1 includes:

[0061] A surface engineering parameter logging device 10, which is used to monitor surface engineering parameters in real time;

[0062] A downhole engineering parameter measurement-while-drilling device 11, and the downhole engineering parameter measurement-while-drilling device 11 includes:

[0063] A downhole engineering parameter macroscopic monitoring sub-device 110, which is used to monitor the overall engineering parameters of the downhole drill bit and drill string in real time;

[0064] The downhole fault precise monitoring sub-device 111 is used to monitor the local engineering parameters of specified downhole components in real time;

[0065] The downhole fault warning sub-device 112 is used to perform fault feature analysis based on surface engineering parameters and downhole real-time measured engineering parameters, and generate downhole fault warning signals; among them,

[0066] The downhole real-time measured engineering parameters include overall engineering parameters and local engineering parameters.

[0067] It should be noted that the downhole fault precise monitoring sub-device 111 is installed on the drill bit or drill string. It is separately designed for certain common faults of the drill bit or drill string. It can use single or multiple sensors to monitor the change of characteristic parameters before and after the occurrence of a certain fault. Of course, for different fault types, different types of sensors are selected, and the installation position and structure of the precise monitoring device are also different.

[0068] In addition, in the embodiments of the present application, when specifically implemented and communicating within the system, wireless communication technology can be specifically used for communication. Of course, if conditions permit, wired communication technology can also be used.

[0069] Specifically, the downhole fault warning sub-device 112 is built-in with a downhole data processing unit and configured with a fault grading algorithm. Different level threshold values are set according to the preset fault grading standard. Fault grading processing is performed based on surface engineering parameters and downhole real-time measured engineering parameters, and corresponding-level fault warning signals are issued.

[0070] For example, the downhole fault warning sub-device 112 is equipped with a downhole vibration acceleration sensor, and a three-axis vibration grading program and algorithm are built-in. Threshold values for each vibration level are preset according to the three-axis vibration grading standard, and three-axis vibration grading processing is performed on the vibration measurement data downhole. Finally, the vibration level is uploaded and displayed on the ground software, and the driller can directly identify the strength of downhole vibration.

[0071] The embodiments of the present application have the following advantages:

[0072] 1. It integrates macroscopic monitoring and precise monitoring, monitors the downhole fault situation, and gives timely alarms, providing guarantee for downhole exploration work and effectively improving the accuracy of fault judgment.

[0073] 2. The downhole fault warning sub-device 112 is built-in with a downhole data processing unit, performs fault feature analysis on the monitoring data downhole, directly reports the accurate fault level to the ground, improves the driller's work efficiency, and makes the ground response more timely;

[0074] 3. Compared with the conventional drilling monitoring and control system, the real-time measurement data of bottom-hole engineering parameters, the real-time data of downhole fault classification, and the early warning of bit and drill string faults are accessed, improving the pertinence and effectiveness of drilling construction parameter adjustment, and at the same time improving the safety of downhole drill strings.

[0075] Specifically, the surface engineering parameter logging device 10 uses winch sensors, hook load sensors, rotary table torque sensors, etc. to monitor engineering parameters such as surface mechanical drilling speed, drilling pressure, and torque in real time.

[0076] Furthermore, the drilling monitoring system with downhole fault early warning function further includes:

[0077] The driller control subsystem 2, which is used to generate a rig adjustment instruction according to surface engineering parameters, downhole real-time measured engineering parameters, downhole fault early warning signals, drilling design parameters, geological environment parameters, and the adjacent well database.

[0078] Among them, the geological environment parameters include a geological model, and the adjacent well database includes adjacent well drilling operation data, and the rig adjustment instruction is an adjustment instruction for parameters such as the optimal drilling pressure and the optimal rotation speed.

[0079] Furthermore, the drilling monitoring system with downhole fault early warning function further includes:

[0080] The rig execution subsystem 3, which is used to control the rig actuator according to the rig adjustment instruction.

[0081] Furthermore, the drilling monitoring system with downhole fault early warning function further includes:

[0082] The data transmission subsystem 4, which is used to transmit surface engineering parameters, downhole real-time measured engineering parameters, and downhole fault early warning signals to the driller control subsystem 2.

[0083] It should be noted that the wireless short-range transmission method, the wired transmission method in the downhole engineering parameter measurement-while-drilling system, and the wireless long-range transmission method of transmitting downhole measurement data and fault early warning signals to the driller control subsystem 2 through mud pulse MWD or electromagnetic wave MWD.

[0084] Specifically, the downhole fault precise monitoring sub-device 111 includes a bit fault precise monitoring sub-device 1110 or a drill string fault precise monitoring sub-device 1111;

[0085] The bit fault precise monitoring sub-device 1110 is used to monitor the fault condition of the bit in real time;

[0086] The drill string fault precise monitoring sub-device 1111 is used to monitor the fault condition of the drill string in real time.

[0087] Specifically, the downhole engineering parameter macro monitoring sub-device 110 includes a near-bit monitoring sub-section 1100 or a far-bit monitoring sub-section 1101:

[0088] The near-bit monitoring sub-section 1100 is used to detect the engineering parameters at the bit;

[0089] The far-bit monitoring sub-section 1101 is used to detect the engineering parameters at the drill string.

[0090] Specifically, both the near-bit monitoring sub-section 1100 and the far-bit monitoring sub-section 1101 are configured with a weight-on-bit sensor, a rotary speed sensor, a torque sensor, a bending stress sensor, and a vibration acceleration sensor;

[0091] Thereby, the weight-on-bit, rotary speed, torque, bending stress, vibration and other engineering parameters at the bit or the drill string are respectively monitored.

[0092] As shown in the accompanying drawings of the specification Figures 4 to 7 Four cases of the embodiments of the present application are given. In the figure, A is the bit, B is the positive displacement motor, and C is the MWD system.

[0093] In the first case of the embodiments of the present application, when the downhole engineering parameter macro monitoring sub-device 110 includes the near-bit monitoring sub-section 1100 and does not include the far-bit monitoring sub-section 1101, the downhole engineering parameter macro monitoring sub-device 110 further includes a measurement data receiving sub-section 1102;

[0094] The near-bit monitoring sub-section 1100 is located between the bit and the positive displacement motor;

[0095] The measurement data receiving sub-section 1102 is located above the positive displacement motor.

[0096] The downhole engineering parameter macro monitoring sub-device 110 sequentially includes, from bottom to top, the bit, the near-bit monitoring sub-section 1100, the positive displacement motor, the measurement data receiving sub-section 1102, and the MWD system;

[0097] The near-bit monitoring sub-section 1100 sends its measurement data to the measurement data receiving sub-section 1102 by wireless short-range transmission;

[0098] The measurement data receiving sub-section 1102 can receive the measurement data from the near-bit monitoring sub-section 1100 and send the measurement data to the MWD system configured in the downhole engineering parameter macro monitoring sub-device 110 by wired transmission.

[0099] In the second case of the embodiments of the present application, when the downhole engineering parameter macro monitoring sub-device 110 includes the near-bit monitoring sub-section 1100 and the far-bit monitoring sub-section 1101;

[0100] The near-bit monitoring sub-section 1100 is located between the bit and the positive displacement motor;

[0101] The far-bit monitoring sub-joint 1101 is located above the positive displacement motor (PDM).

[0102] The downhole engineering parameter macro monitoring sub-device 110 sequentially includes a drill bit, a near-bit monitoring sub-joint 1100, a positive displacement motor (PDM), a far-bit monitoring sub-joint 1101, and an MWD system from bottom to top;

[0103] The near-bit monitoring sub-joint 1100 and the far-bit monitoring sub-joint 1101 respectively measure the engineering parameters at the drill bit and the drill string. The near-bit monitoring sub-joint 1100 sends its measured data to the far-bit monitoring sub-joint 1101 through wireless short-range transmission. The far-bit monitoring sub-joint 1101 sends its own measured data and the measured data received from the near-bit monitoring sub-joint 1100 to the MWD system through wired transmission.

[0104] In the third case of the embodiment of the present application, when the downhole fault precise monitoring sub-device 111 includes a drill bit fault precise monitoring sub-device 1110 and does not include a drill string fault precise monitoring sub-device 1111, and the downhole engineering parameter macro monitoring sub-device 110 includes a near-bit monitoring sub-joint 1100 and a far-bit monitoring sub-joint 1101,

[0105] The combination of the downhole fault precise monitoring sub-device 111 and the downhole engineering parameter macro monitoring sub-device 110 is, from bottom to top, a drill bit, a drill bit fault precise monitoring sub-device 1110, a near-bit monitoring sub-joint 1100, a positive displacement motor (PDM), and a far-bit monitoring sub-joint 1101;

[0106] The drill bit fault precise monitoring sub-device 1110 can precisely monitor a certain type of drill bit fault, and the fault warning signal is wirelessly transmitted to the far-bit monitoring sub-joint 1101;

[0107] The near-bit monitoring sub-joint 1100 sends its measured data to the far-bit monitoring sub-joint 1101 through wireless short-range transmission. The far-bit monitoring sub-joint 1101 sends its own measured data and the measured data received from the near-bit monitoring sub-joint 1100, as well as the fault warning signal, to the MWD system through wired transmission.

[0108] In the fourth case of the embodiment of the present application, when the downhole fault precise monitoring sub-device 111 includes a drill bit fault precise monitoring sub-device 1110 and a drill string fault precise monitoring sub-device 1111, and the downhole engineering parameter macro monitoring sub-device 110 includes a near-bit monitoring sub-joint 1100 and a far-bit monitoring sub-joint 1101,

[0109] The combination of the downhole fault precise monitoring sub-device 111 and the downhole engineering parameter macro monitoring sub-device 110 is, from bottom to top, a drill bit, the drill bit fault precise monitoring sub-device 1110, the near-bit monitoring sub-section 1100, a positive displacement motor, the drill string fault precise monitoring sub-device 1111, and the far-bit monitoring sub-section 1101;

[0110] The drill bit fault precise monitoring sub-device 1110 can precisely monitor a certain type of drill bit fault, and the fault warning signal is wirelessly transmitted to the far-bit monitoring sub-section 1101;

[0111] The drill string fault precise monitoring sub-device 1111 can precisely monitor a certain type of drill string fault, and the fault warning signal is wirelessly transmitted to the far-bit monitoring sub-section 1101;

[0112] The near-bit monitoring sub-section 1100 sends its measured data to the far-bit monitoring sub-section 1101 through wireless short-range transmission. The far-bit monitoring sub-section 1101 sends its own measured data, the measured data received from the near-bit monitoring sub-section 1100, and the fault warning signal to the MWD system through wired transmission.

[0113] It should be noted that in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0114] The above are only specific embodiments of this application to enable those skilled in the art to understand or implement this application. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A drilling monitoring system with downhole fault warning function, characterized in that, the system includes an engineering parameter measurement subsystem (1), and the engineering parameter measurement subsystem (1) includes: a surface engineering parameter logging device (10) for real-time monitoring of surface engineering parameters; a downhole engineering parameter measurement-while-drilling device (11), and the downhole engineering parameter measurement-while-drilling device (11) includes: a downhole engineering parameter macroscopic monitoring sub-device (110) for real-time monitoring of the overall engineering parameters of downhole drill bits and drill strings; a downhole fault precise monitoring sub-device (111) for real-time monitoring of the local engineering parameters of specified downhole components; a downhole fault warning sub-device (112) with a built-in downhole data processing unit, and the downhole fault warning sub-device (112) is used for fault feature analysis based on the surface engineering parameters and downhole real-time measured engineering parameters, and generating a downhole fault warning signal; wherein, the downhole real-time measured engineering parameters include the overall engineering parameters and the local engineering parameters; the downhole fault warning sub-device (112) is configured with a fault grading algorithm, sets different level threshold values according to a preset fault grading standard, performs fault grading processing based on the surface engineering parameters and downhole real-time measured engineering parameters, and issues a fault warning signal corresponding to the level; the downhole engineering parameter macroscopic monitoring sub-device (110) includes a near-bit monitoring sub-joint (1100) or a far-bit monitoring sub-joint (1101): the near-bit monitoring sub-joint (1100) is used for detecting the engineering parameters at the drill bit; the far-bit monitoring sub-joint (1101) is used for detecting the engineering parameters at the drill string; the downhole fault precise monitoring sub-device (111) includes a drill bit fault precise monitoring sub-device (1110) or a drill string fault precise monitoring sub-device (1111); the drill bit fault precise monitoring sub-device (1110) is used for real-time monitoring of the fault condition of the drill bit; the drill string fault precise monitoring sub-device (1111) is used for real-time monitoring of the fault condition of the drill string; both the near-bit monitoring sub-joint (1100) and the far-bit monitoring sub-joint (1101) are configured with a weight-on-bit sensor, a rotary speed sensor, a torque sensor, a bending stress sensor, and a vibration acceleration sensor; when the downhole engineering parameter macroscopic monitoring sub-device (110) includes the near-bit monitoring sub-joint (1100) and the far-bit monitoring sub-joint (1101); the near-bit monitoring sub-joint (1100) is located between the drill bit and the positive displacement motor; the far-bit monitoring sub-joint (1101) is located above the positive displacement motor; the near-bit monitoring sub-joint (1100) sends its measured data to the far-bit monitoring sub-joint (1101) by wireless short-range transmission, and the far-bit monitoring sub-joint (1101) sends its own measured data, the measured data received from the near-bit monitoring sub-joint (1100), and the fault warning signal to the MWD system by wired transmission; the downhole fault precise monitoring sub-device (111) is installed on the drill bit or the drill string.

2. The drilling monitoring system with downhole fault warning function as claimed in claim 1, characterized in that, the system further comprises: a driller control subsystem (2) for generating a rig adjustment instruction according to the surface engineering parameters, the downhole real-time measured engineering parameters, the downhole fault warning signal, the drilling design parameters, the geological environment parameters and the adjacent well database.

3. The drilling monitoring system with downhole fault warning function as claimed in claim 2, characterized in that, the system further comprises: a rig execution subsystem (3) for controlling a rig actuator according to the rig adjustment instruction.

4. The drilling monitoring system with downhole fault warning function as claimed in claim 2, characterized in that, the system further comprises: a data transmission subsystem (4) for transmitting the surface engineering parameters, the downhole real-time measured engineering parameters and the downhole fault warning signal to the driller control subsystem (2).

5. The drilling monitoring system with downhole fault warning function as claimed in claim 1, characterized in that, when the downhole engineering parameter macro monitoring sub-device (110) includes the near-bit monitoring sub-joint (1100) and does not include the far-bit monitoring sub-joint (1101), the downhole engineering parameter macro monitoring sub-device (110) further includes a measurement data receiving sub-joint (1102); the near-bit monitoring sub-joint (1100) is located between the bit and the positive displacement motor; the measurement data receiving sub-joint (1102) is located above the positive displacement motor.

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