A device and method for measuring near-bit engineering parameters

Abstract

This invention discloses a near-bit engineering parameter measuring device and method. The measuring device includes a novel drill bit and an engineering parameter measuring mechanism connected to each other. The novel drill bit includes a drill bit body, a drill pressure strain gauge, a torque strain gauge, and a data transmission system, accurately measuring operating parameters such as torque and thrust at the drill bit during drilling. The engineering parameter measuring mechanism includes an outer cylinder, an inner cylinder, a triaxial accelerometer, a signal processing module, a ground signal receiving device, and a battery module. The engineering parameter measuring mechanism is a double-layer, double-cylinder structure that uses the principle of magnetoelectricity to generate current and power the measuring system. The magnitude of the current generated when the inner cylinder rotates relative to the outer cylinder provides feedback on the relative rotational speed of the drill bit. Simultaneously, a triaxial accelerometer is arranged on the outer cylinder to acquire the angular acceleration information of the outer cylinder, calculate the rotational speed of the outer cylinder, and sum the velocities to obtain the actual rotational speed at the drill bit, thus achieving accurate measurement of the drill bit rotational speed.

Description

Technical Field

[0001] This invention relates to a near-bit engineering parameter measuring device and method, belonging to the field of deviated well drilling technology. Background Technology

[0002] Inclined shaft drilling rigs, as a typical trenchless equipment, have broad application prospects in tunnel engineering. Inclined shaft drilling primarily involves drilling inclined holes. During operation, push-pull forces and torques are applied to the drill rod at the power head, propelling it forward. During drilling, a screw motor connected to the rear of the drill bit drives its rotation. Due to complex geological environments, different geological conditions have varying degrees of impact on the drill bit during drilling. Furthermore, different rotational speeds, torques, and thrust applied to the drill bit result in different drilling efficiencies. In practical engineering, it is necessary to measure the engineering parameters at the drill bit to reflect the drilling progress in real time and monitor the geological information of the strata near the drill bit. However, during drilling, the large drilling depth and complex borehole geological conditions pose a significant challenge to the measurement of drilling parameters at the drill bit. Therefore, there is an urgent need for a method to measure the engineering parameters of the drill bit and its vicinity to obtain these parameters more accurately and efficiently, thereby guiding actual construction operations.

[0003] When drilling with an inclined shaft drilling rig, the drilling distance is long and the strata are complex. Due to the flexible deformation of the drill pipe, the drilling parameters such as thrust and torque obtained at the whole machine will be greatly attenuated when they are transmitted to the drill bit. They cannot truly reflect the mechanical characteristics of the drilling tools and the mechanical characteristics of the rock near the drill bit, and can only make a rough assessment of the geological characteristics.

[0004] In the patent "A device for measuring torque and feed force near the drill bit (CN 108120533 B)," the torque and feed force near the drill bit are measured, but the actual torque and feed force on the drill bit are not measured, and the actual rotation speed of the drill bit is not measured. Therefore, the coupling relationship between the rotation speed and torque of the drill bit during drilling cannot be monitored in real time, and it is impossible to detect whether the drill bit is stuck in time, resulting in insufficient data collection.

[0005] The patent "A Real-time Drilling Measurement Device for Near-Bit Engineering Parameters (CN 113931615 A)" measures various mechanical parameters near the drill bit, but it does not measure the actual torque, thrust, and other mechanical parameters at the drill bit. Therefore, it cannot truly reflect the actual relationship between the mechanical response of the drill bit and the formation characteristics, which is a certain deficiency.

[0006] The patent "Method for determining drill bit torque and method for determining drill bit working efficiency (CN 110763383A)" can obtain drill bit torque and working efficiency, but the parameters obtained are limited, and the drill bit torque is obtained through theoretical calculation without actual measurement of parameters such as torque, so the reliability of its data is somewhat lacking.

[0007] None of the above technologies can achieve continuous measurement of mechanical parameters at the drill bit, which limits their application in engineering. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a near-bit engineering parameter measuring device and method to solve the problem of difficulty in measuring drilling parameters at the drill bit during the drilling process of an inclined well drilling rig.

[0009] To achieve the above objectives, the present invention is implemented using the following technical solution:

[0010] In a first aspect, the present invention provides a near-bit engineering parameter measuring device, comprising: a novel drill bit and an engineering parameter measuring mechanism interconnected, wherein:

[0011] The engineering parameter measuring mechanism includes an outer cylinder, an inner cylinder, a triaxial accelerometer, a signal processing module, a ground signal receiving device, and a battery module, wherein:

[0012] The inner cylinder is disposed inside the outer cylinder and is placed coaxially with the outer cylinder. The outer cylinder is connected to the stator of the screw motor. One end of the inner cylinder is connected to the rotor of the screw motor, and the other end is connected to the new drill bit. A conductive coil is disposed in the middle of the inner cylinder. The outer cylinder is configured as a magnetic structure. When the inner cylinder rotates with the rotor of the screw motor, current is generated in the conductive coil and stored in the battery module.

[0013] The battery module, signal processing module, and triaxial accelerometer are all located on the inner wall of the outer cylinder. The battery module contains a galvanometer. The signal processing module is communicatively connected to the galvanometer, the triaxial accelerometer, and a ground signal receiving device located on the ground. The signal processing module receives signals from the galvanometer and the triaxial accelerometer, performs logical calculations to obtain drilling parameter information, and transmits the information to the ground signal receiving device.

[0014] Furthermore, the novel drill bit includes a drill bit body, a drill pressure strain gauge, a torque strain gauge, and a data transmission system. The drill bit body is connected to the inner cylinder. An annular groove is provided on the tail end face of the drill bit body. In the annular groove, the drill pressure strain gauge, the torque strain gauge, and the data transmission system are arranged sequentially from bottom to top along the axial direction. The drill pressure strain gauge and the torque strain gauge are connected to the data transmission system, and the data transmission system is communicatively connected to the signal processing module.

[0015] Furthermore, the drill pressure strain gauge and torque strain gauge convert the strain signal into a current signal and transmit it to the data transmission system. The data transmission system then transmits the current signal to the signal processing module for data conversion, obtains the torque and propulsion information on the drill bit, and transmits the information to the ground signal receiving device.

[0016] Furthermore, the triaxial accelerometer is used to measure the angular acceleration information of the outer cylinder and transmit the measured signal to the signal processing module. In the signal processing module, the angular acceleration information is logically calculated to obtain the rotational speed information of the outer cylinder and then transmitted to the ground signal receiving device.

[0017] Furthermore, the ammeter is used to transmit the measured current value information generated by the rotation of the inner cylinder relative to the outer cylinder to the signal processing module. In the signal processing module, the current value information is converted into rotation speed information to obtain the relative rotation speed of the inner cylinder and the new drill bit relative to the outer cylinder. Then, the rotation speed of the outer cylinder is superimposed with the relative rotation speed of the new drill bit relative to the outer cylinder to obtain the rotation speed information of the new drill bit. Finally, the rotation speed information is transmitted to the ground signal receiving device.

[0018] Furthermore, the drill pressure strain gauge is installed at the bottom of the annular groove to measure the drill bit compressive strain information and obtain the drill bit propulsion force. The torque strain gauge is installed on top of the drill pressure strain gauge to measure the drill bit torque strain information and obtain the drill bit torque. The measurement circuits of both the drill pressure strain gauge and the torque strain gauge are full-bridge connected. Four strain gauges are arranged equidistantly along the circumference of the annular groove, and each strain gauge of both the drill pressure strain gauge and the torque strain gauge is provided with a protective shell.

[0019] Furthermore, the axial cross-section of the inner cylinder is an I-shaped structure, thinner in the middle and thicker at both ends.

[0020] Furthermore, the connection between the outer cylinder and the inner cylinder is such that axial linear displacement is restricted, while relative rotation around the axis is allowed.

[0021] Secondly, the present invention provides a measurement method for the near-bit engineering parameter measuring device according to any one of the foregoing claims, comprising:

[0022] During construction, the angular acceleration information of the outer cylinder is measured by a triaxial accelerometer, and the measured signal is transmitted to the signal processing module. The signal processing module performs logical calculations on the angular acceleration information to obtain the rotational speed information of the outer cylinder.

[0023] The current value generated by the rotation of the inner cylinder relative to the outer cylinder is measured by the ammeter in the battery module. The current value information is transmitted to the signal processing module, where the current value information is converted into rotation speed information to obtain the relative rotation speed of the inner cylinder and the new drill bit relative to the outer cylinder.

[0024] The rotational speed of the outer cylinder is superimposed with the relative rotational speed of the new drill bit relative to the outer cylinder to obtain the rotational speed information of the new drill bit, and then the rotational speed information is transmitted to the ground signal receiving device.

[0025] Furthermore, the measurement method also includes: converting the strain signal into a current signal through a drill pressure strain gauge and a torque strain gauge and transmitting it to the data transmission system; the data transmission system then transmits the current signal to the signal processing module for data conversion, obtains the torque and propulsion information on the drill bit, and transmits the information to the ground signal receiving device.

[0026] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0027] (1) By technically modifying existing drill bits, the torque and propulsion force at the drill bit can be measured and transmitted in real time.

[0028] (2) It can realize the real-time measurement of the rotation speed of the drill bit and drill rod, and promptly detect the stuck drill bit phenomenon.

[0029] (3) The screw motor drives the inner cylinder of the measuring device to rotate and generate current to power the entire measuring system, enabling long-term measurement. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a near-drill bit engineering parameter measuring device provided in an embodiment of the present invention;

[0031] Figure 2 yes Figure 1 Cross-sectional view of section AA;

[0032] Figure 3 yes Figure 2 Cross-sectional view of the BB section structure;

[0033] Figure 4 yes Figure 2 Cross-sectional view of the CC section structure;

[0034] Figure 5 This is a schematic diagram of the testing system provided in an embodiment of the present invention.

[0035] In the figure: 1. New type of drill bit; 2. Engineering parameter measurement mechanism; 3. Drill pressure strain gauge; 4. Torque strain gauge; 5. Data transmission system; 6. Cover plate; 7. Outer cylinder; 8. Battery module; 9. Signal processing module; 10. Triaxial accelerometer; 11. Inner cylinder; 12. Drill bit body; 13. Ground signal receiving device. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0037] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] Example 1

[0040] This embodiment introduces a near-bit engineering parameter measurement device, comprising: a novel drill bit 1 and an engineering parameter measurement mechanism 2. By technically modifying an existing tricone drill bit, a strain measurement system and a data transmission system 5 are installed on it to measure the drill bit torque and thrust, thereby obtaining the true mechanical parameters of the drill bit. An engineering parameter measurement mechanism 2 is invented; this mechanism has a double-cylinder structure and can measure the rotational speed of the drill rod and drill bit near the drill bit, while simultaneously powering the entire measurement system, thus enabling long-term measurement while drilling. The novel drill bit 1 includes a drill bit body 12, a strain measurement system (drill pressure strain gauge 3 and torque strain gauge 4), and a data transmission system 5; the engineering parameter measurement mechanism 2 includes an outer cylinder 7, an inner cylinder 11, a triaxial accelerometer 10, a signal processing module 9, a ground signal receiving device 13, and a battery module 8, etc. All types of sensors in the strain measurement system are connected to the data transmission system 5; in the engineering parameter measurement mechanism 2, the inner cylinder 11 is set inside the outer cylinder 7 and placed coaxially with the outer cylinder 7, and the inner cylinder 11 and the outer cylinder 7 together form an energy-saving power supply system; the triaxial accelerometer 10 and the battery module 8 are both wired to the signal processing module 9.

[0041] The new drill bit 1 is modified from an existing tricone drill bit. An annular groove is set on the drill bit to serve as the drill bit body 12, which is used to house various electronic devices. The strain measurement system includes a torque strain gauge 4 and a drill pressure strain gauge 3, which are arranged on the inner wall of the annular groove of the drill bit body 12 to measure data such as torque and thrust on the drill bit. The data transmission system 5 is set on the strain measurement system within the annular groove and is connected to the strain measurement system to receive and transmit the data measured by the strain measurement system. An annular cover plate 6 is set on the data transmission system 5 to protect the electronic components.

[0042] The engineering parameter measuring mechanism 2 has a double-cylinder structure. The inner cylinder 11 is located inside the outer cylinder 7 and is coaxial with the outer cylinder 7. The inner cylinder 11 serves as the rotor of the measuring device and is threadedly connected to the rotor of the screw motor, allowing it to rotate about its axis relative to the outer cylinder 7. The outer cylinder 7 serves as the stator of the measuring device and is connected to the outer wall of the screw motor. The triaxial accelerometer 10, the signal processing module 9, and the battery module 8 are respectively located on the inner wall of the outer cylinder 7. The triaxial accelerometer 10 measures the angular acceleration of the outer cylinder 7 and obtains the rotational speed information of the outer cylinder 7. The signal processing module 9 is used to receive and transmit angular acceleration information, and simultaneously receive and transmit torque and thrust information transmitted from the data transmission system 5 on the drill bit. The battery module 8 is used to store and release electrical energy to power the electronic components in the drill bit and the measuring device.

[0043] A conductive coil is installed on the inner cylinder 11 of the measuring device, and a magnetic structure is installed on the outer cylinder 7. When the inner cylinder 11 rotates, the mechanical energy transmitted from the screw motor is converted into electrical energy by electromagnetic induction and stored in the battery module 8 to continuously power the electronic equipment.

[0044] During the drilling operation of the inclined shaft drilling rig, the power head continuously outputs torque and thrust, driving the drill pipe and drill bit to rotate and drill forward. The connection sequence of the drilling tools below the ground is as follows: new drill bit 1, engineering parameter measuring mechanism 2, screw motor, and drill pipe. The new drill bit 1 cuts the rock under the combined action of thrust, torque, and mud. The torque strain gauge 4 and drilling pressure strain gauge 3 on it are connected to the data transmission system 5 to measure the drill bit torque and pressure strain information, respectively, and transmit the data to the data transmission system 5. Then, the data transmission system 5 transmits the data to the signal processing module 9 in the engineering parameter measuring mechanism 2 for data conversion, thereby obtaining torque and thrust information.

[0045] During operation, the rotational speed of the novel drill bit 1 is determined by the rotational speed of the outer cylinder 7 in the engineering parameter measuring mechanism 2 and the relative rotational speed of the novel drill bit 1 relative to the outer cylinder 7. A triaxial accelerometer 10 is arranged on the inner wall of the outer cylinder 7. When the outer cylinder 7 rotates, its angular acceleration can be measured in real time, and the data is transmitted to the signal processing module 9. After data processing, the rotational speed of the outer cylinder 7 is obtained. The magnitude of the current in the conductive coil installed on the inner cylinder 11 is related to the relative rotational speed of the drill bit; the higher the relative rotational speed, the larger the current value. When the coil generates current flowing to the battery module 8, the ammeter inside the battery module 8 simultaneously measures the magnitude of the generated current and outputs the current value signal to the signal processing module 9. The internal logic calculates the relative rotational speed of the novel drill bit 1 at this time. In the signal processing module 9, the rotational speed of the outer cylinder 7 and the relative rotational speed of the novel drill bit 1 are superimposed to obtain the actual rotational speed of the novel drill bit 1.

[0046] Throughout the measurement system, information acquired such as torque, thrust, rotational speed of the outer cylinder 7 of the engineering parameter measuring mechanism 2, and rotational speed of the new drill bit 1 are all transmitted to the signal processing module 9 for processing and storage. Simultaneously, the signal processing module 9 has a signal transmission function, employing methods such as fiber optic transmission, electromagnetic signal transmission, and mud pulse signal transmission, ultimately transmitting the signal to the ground signal receiving device 13 for reference by construction personnel.

[0047] This embodiment modifies existing tricone drill bits to measure torque and thrust at the drill bit, using these measurements as a reference to obtain the mechanical characteristics of the rock at the drill bit. An energy-saving power supply system is installed in the engineering parameter measurement mechanism 2, utilizing the mechanical energy of the screw motor rotor to generate electrical energy, continuously powering the measurement system for extended measurement periods with strong endurance. The magnitude of the current generated by the power supply system reflects the relative rotational speed of the inner cylinder 11 of the measurement mechanism, and sensors monitor the actual rotational speed on the outer cylinder 7 of the measurement mechanism to determine the actual rotational speed at the drill bit. This monitors the drilling progress at the drill bit and determines the coupling relationship between drill bit rotational speed and torque, thereby better guiding construction operations.

[0048] The following description, in conjunction with a preferred embodiment, illustrates the content involved in the above embodiments.

[0049] This invention patent provides a near-bit engineering parameter measuring device, the structural schematic of which is shown in the figure below. Figures 1-4 As shown. It mainly includes a new type of drill bit 1 (drill pressure strain gauge 3, torque strain gauge 4, data transmission system 5, cover plate 6, drill bit body 12) and an engineering parameter measurement mechanism 2 (outer cylinder 7, battery module 8, signal processing module 9, triaxial accelerometer 10, inner cylinder 11, ground signal receiving device 13). The schematic diagram of the testing system in the new drill bit and engineering parameter measurement mechanism is shown below. Figure 5 The test system uses the signal processing module 9 as the logical center. The drill pressure strain gauge 3 and the torque strain gauge 4 are connected to the data transmission system 5 and send data to the data transmission system 5. The data transmission system 5 transmits the data to the signal processing module 9. The triaxial accelerometer 10 and the battery module 8 are connected to the signal processing module 9 and transmit data. The signal processing module 9 acquires the data from each module and transmits it to the ground signal receiving device 13.

[0050] The new drill bit 1 is connected to the engineering parameter measuring mechanism 2 by a thread. The drill bit body 12 is connected to the inner cylinder 11 of the measuring device, and the inner cylinder 11 of the measuring mechanism is connected to the rotor of the screw motor. During construction, the power head of the whole machine outputs torque and propulsion force, and the outer cylinder 7 of the measuring mechanism rotates and moves forward. Under the action of mud pressure, the rotor of the screw motor rotates continuously, driving the inner cylinder 11 and the new drill bit 1 to rotate.

[0051] The novel drill bit 1 comprises a pressure strain gauge 3, a torque strain gauge 4, a data transmission system 5, a cover plate 6, and a drill bit body 12. An annular groove is provided on the tail end face of the tricone drill bit to house the pressure strain gauge 3, torque strain gauge 4, data transmission system 5, and cover plate 6, forming the drill bit body 12. Within the annular groove of the drill bit body 12, the pressure strain gauge 3, torque strain gauge 4, data transmission system 5, and cover plate 6 are arranged axially from bottom to top. The pressure strain gauge 3, located at the bottom of the groove, measures the compressive strain of the drill bit to obtain the drill bit's propulsive force. The torque strain gauge 4, mounted on top of the pressure strain gauge 3, measures the torque strain of the drill bit to obtain the drill bit's torque. Both the pressure strain gauge 3 and torque strain gauge 4 use a full-bridge connection for their measurement circuits, with four strain gauges equidistantly arranged around the annular groove to ensure the stability of the test signals. Each strain gauge of both the pressure strain gauge 3 and torque strain gauge 4 is equipped with a protective shell to prevent wear during construction from affecting measurement accuracy. A data transmission system 5 is installed above the torque strain gauge 4 to receive the measurement data from the drill pressure strain gauge 3 and the torque strain gauge 4, and to wirelessly transmit the data to the signal processing module 9 in the engineering parameter measurement mechanism 2. A cover plate 6 is arranged above the data transmission system 5 to protect the electronic equipment in the groove.

[0052] The engineering parameter measuring mechanism 2 consists of an outer cylinder 7, a battery module 8, a signal processing module 9, a triaxial accelerometer 10, an inner cylinder 11, and a ground signal receiving device 13. The outer cylinder 7 and the inner cylinder 11 are respectively connected and fixed to the stator and rotor of the screw motor. Axial relative linear displacement between the outer cylinder 7 and the inner cylinder 11 is restricted, but relative rotation around the axial direction is allowed. The axial cross-section of the inner cylinder 11 is an I-shaped structure, narrow in the middle and wide at both ends, providing space for electronic equipment. The battery module 8 is located in the middle of the inner wall of the outer cylinder 7, and is a semi-annular plate structure used to store and release electrical energy to power the measuring system. Simultaneously, a galvanometer is installed in the battery module 8 to record the magnitude of the input current. The signal processing module 9 is located in the middle of the inner wall of the outer cylinder 7, opposite to the battery module and close to the data transmission system 5. It receives signals from the data transmission system 5, the battery module 8, and the triaxial accelerometer 10, performs logical calculations to obtain drilling parameter information, and transmits the information to the ground signal receiving device 13. The triaxial accelerometer 10 is located in the middle of the inner wall of the outer cylinder 7, adjacent to the signal processing module 9. It is used to measure the angular acceleration information of the outer cylinder 7 and transmit the measured signal to the signal processing module 9. The signal processing module 9 performs logical calculations on the angular acceleration information to obtain the rotational speed of the outer cylinder 7.

[0053] A conductive coil is installed in the middle of the inner cylinder 11, and the outer cylinder 7 is configured with a magnetic structure. When the inner cylinder 11 rotates with the screw motor rotor, a current is generated in the conductive coil and stored in the battery module 8 to power the entire measurement system, enabling long-term measurement. The magnitude of the current generated in the coil of the inner cylinder 11 is related to the relative rotational speed of the inner cylinder 11 relative to the outer cylinder 7. The ammeter in the battery module 8 transmits the input current value information to the signal processing module 9, where the current value information is converted into rotational speed information. The relative rotational speeds of the inner cylinder 11 and the new drill bit 1 relative to the outer cylinder 7 are obtained. The rotational speed of the outer cylinder 7 is then superimposed with the relative rotational speed of the new drill bit 1 relative to the outer cylinder 7 to obtain the rotational speed information of the new drill bit. Finally, the rotational speed information is transmitted to the ground signal receiving device 13.

[0054] During construction, the measurement system is activated simultaneously to measure data. The drill pressure strain gauge 3 and torque strain gauge 4 convert strain signals into current signals, which are then transmitted to the data transmission system 5. The data transmission system 5 then transmits the current signals to the signal processing module 9 in the engineering parameter measurement mechanism 2 for data conversion, obtaining information such as torque and thrust on the drill bit 1. The triaxial accelerometer 10 transmits the measured angular acceleration information to the signal processing module 9, where the internal logic calculates the outer cylinder rotation speed. The ammeter in the battery module 8 measures the current, feeds it back to the signal processing module, and performs logic calculations to obtain the relative rotation speed of the drill bit, thus determining the actual rotation speed of the new drill bit. Data measured by each measurement module is transmitted to the signal processing module 9 for processing. The signal processing module also has a signal transmission function, utilizing methods such as fiber optic transmission, electromagnetic signal transmission, and mud pulse signal transmission, ultimately transmitting the data to the ground signal receiving device 13 for reference by construction personnel.

[0055] Example 2

[0056] This embodiment provides a measurement method for the near-bit engineering parameter measuring device according to any one of Embodiments 1, including:

[0057] During construction, the angular acceleration information of the outer cylinder 7 is measured by the triaxial accelerometer 10, and the measured signal is transmitted to the signal processing module 9. The signal processing module 9 performs logical calculations on the angular acceleration information to obtain the rotational speed information of the outer cylinder 7.

[0058] The input current value is measured by the ammeter in the battery module 8, and the input current value information is transmitted to the signal processing module 9. The signal processing module 9 converts the current value information into rotation speed information to obtain the relative rotation speed of the inner cylinder 11 and the new drill bit 1 relative to the outer cylinder 7.

[0059] The rotational speed of the outer cylinder 7 is superimposed with the relative rotational speed of the new drill bit 1 relative to the outer cylinder 7 to obtain the rotational speed information of the new drill bit 1, and then the rotational speed information is transmitted to the ground signal receiving device 13.

[0060] The strain signal is converted into a current signal by the drill pressure strain gauge 3 and the torque strain gauge 4 and transmitted to the data transmission system 5. The data transmission system 5 then transmits the current signal to the signal processing module 9 for data conversion, obtains the torque and propulsion information on the drill bit, and transmits the information to the ground signal receiving device 13.

[0061] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A near-bit engineering parameter measuring device, characterized in that, include: A novel drill bit (1) and an engineering parameter measuring mechanism (2) are interconnected, wherein: The engineering parameter measuring mechanism (2) includes an outer cylinder (7), an inner cylinder (11), a triaxial accelerometer (10), a signal processing module (9), a ground signal receiving device (13), and a battery module (8), wherein: The inner cylinder (11) is placed inside the outer cylinder (7) and is coaxial with the outer cylinder (7). The outer cylinder (7) is connected to the stator of the screw motor. One end of the inner cylinder (11) is connected to the rotor of the screw motor, and the other end is connected to the new drill bit (1). A conductive coil is provided in the middle of the inner cylinder (11). The outer cylinder (7) is set as a magnetic structure. When the inner cylinder (11) rotates with the rotor of the screw motor, current is generated in the conductive coil and stored in the battery module (8). The battery module (8), signal processing module (9), and triaxial accelerometer (10) are all located on the inner wall of the outer cylinder (7). The battery module (8) is equipped with a galvanometer. The signal processing module (9) is connected to the galvanometer, triaxial accelerometer (10), and ground signal receiving device (13) respectively. The signal processing module (9) is used to receive signals from the galvanometer and triaxial accelerometer (10), perform logical calculations to obtain drilling parameter information, and transmit the information to the ground signal receiving device (13).

2. The near-bit engineering parameter measuring device according to claim 1, characterized in that, The novel drill bit (1) includes a drill bit body (12), a drill pressure strain gauge (3), a torque strain gauge (4), and a data transmission system (5). The drill bit body (12) is connected to the inner cylinder (11). An annular groove is provided on the tail end face of the drill bit body (12). In the annular groove, the drill pressure strain gauge (3), the torque strain gauge (4), and the data transmission system (5) are arranged sequentially from bottom to top along the axial direction. The drill pressure strain gauge (3) and the torque strain gauge (4) are connected to the data transmission system (5). The data transmission system (5) is communicatively connected to the signal processing module (9).

3. The near-bit engineering parameter measuring device according to claim 2, characterized in that, The drill pressure strain gauge (3) and torque strain gauge (4) convert the strain signal into a current signal and transmit it to the data transmission system (5). The data transmission system (5) then transmits the current signal to the signal processing module (9) for data conversion, obtains the torque and propulsion information on the drill bit, and transmits the information to the ground signal receiving device.

4. The near-bit engineering parameter measuring device according to claim 1, characterized in that, The triaxial accelerometer (10) is used to measure the angular acceleration information of the outer cylinder (7) and transmit the measured signal to the signal processing module (9). In the signal processing module (9), the angular acceleration information is logically calculated to obtain the rotational speed information of the outer cylinder (7) and the information is transmitted to the ground signal receiving device (13).

5. The near-bit engineering parameter measuring device according to claim 1, characterized in that, The ammeter is used to transmit the input current value information to the signal processing module (9). In the signal processing module (9), the current value information is converted into rotation speed information, and the relative rotation speed of the inner cylinder (11) and the new drill bit (1) relative to the outer cylinder (7) is obtained. Then, the rotation speed of the outer cylinder (7) is superimposed with the relative rotation speed to obtain the rotation speed information of the new drill bit (1). Then, the rotation speed information is transmitted to the ground signal receiving device (13).

6. The near-bit engineering parameter measuring device according to claim 2, characterized in that, The drill pressure strain gauge (3) is installed at the bottom of the annular groove to measure the drill bit pressure strain information and obtain the drill bit propulsion force. The torque strain gauge (4) is installed on the drill pressure strain gauge (3) to measure the drill bit torque strain information and obtain the drill bit torque. The measurement circuits of the drill pressure strain gauge (3) and the torque strain gauge (4) are both connected in a full-bridge manner. Four strain gauges are arranged at equal intervals along the annular groove. Each strain gauge of the drill pressure strain gauge (3) and the torque strain gauge (4) is provided with a protective shell.

7. The near-bit engineering parameter measuring device according to claim 1, characterized in that, The inner cylinder (11) has an I-shaped cross-section, which is thinner in the middle and thicker at both ends.

8. The near-bit engineering parameter measuring device according to claim 1, characterized in that, The connection between the outer cylinder (7) and the inner cylinder (11) is such that axial linear displacement is restricted, but relative rotation around the axis is allowed.

9. A measurement method for a near-bit engineering parameter measuring device according to any one of claims 1-8, characterized in that, include: During construction, the angular acceleration information of the outer cylinder (7) is measured by a triaxial accelerometer (10), and the measured signal is transmitted to the signal processing module (9). The signal processing module (9) performs logical calculations on the angular acceleration information to obtain the rotational speed information of the outer cylinder (7). The current value information generated by the rotation of the inner cylinder (11) relative to the outer cylinder (7) is measured by the ammeter in the battery module (8), and the current value information is transmitted to the signal processing module (9). In the signal processing module (9), the current value information is converted into rotation speed information, and the relative rotation speed of the inner cylinder (11) and the new drill bit (1) relative to the outer cylinder (7) is obtained. The rotational speed of the outer cylinder (7) is superimposed with the relative rotational speed of the new drill bit (1) relative to the outer cylinder (7) to obtain the rotational speed information of the new drill bit (1), and then the rotational speed information is transmitted to the ground signal receiving device (13).

10. The measurement method of the near-bit engineering parameter measuring device according to claim 9, characterized in that, The measurement method further includes: converting the strain signal into a current signal through the drill pressure strain gauge (3) and the torque strain gauge (4) and transmitting it to the data transmission system (5); the data transmission system (5) then transmits the current signal to the signal processing module (9) for data conversion, obtains the torque and propulsion information on the drill bit, and transmits the information to the ground signal receiving device (13).

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