Screw device with near-bit measurement function and application method

Abstract

The invention provides a screw device with a near-bit measurement function and an application method. The device comprises a screw, a motor assembly, a universal shaft assembly, a transmission shaft assembly, a near-bit measurement module, a data transmission wire and a hard connection interface, wherein the motor assembly, the universal shaft assembly, the transmission shaft assembly, the near-bit measurement module, the data transmission wire and the hard connection interface are arranged in the screw. The screw rod is connected with the non-magnetic drill collar; the motor assembly is connected with the non-magnetic drill collar, and mechanical energy is formed based on driving of slurry pressure. The universal shaft assembly transmits torque and rotating speed generated by the motor to the transmission shaft assembly, and the transmission shaft assembly is connected with the drill bit and used for driving the drill bit to rotate to cut stratum rock debris to complete drilling construction. The near-bit measurement module is installed at the transmission shaft assembly and connected with the MWD system through a data transmission wire and a hard connection interface, and interaction of control signals and measurement data is achieved based on the hard connection interface. By the adoption of the scheme, the problems that in the prior art, logging precision is insufficient, and the build-up rate is affected can be solved, and the high-build-up-rate screw with the near-bit measurement function is effectively provided.

Description

Technical Field

[0001] The present invention relates to the technical field of oil drilling optimization, and particularly to a screw device with near-bit measurement function and an application method thereof. Background Art

[0002] With the continuous deepening of oil and gas exploration and development, technologies such as logging while drilling and geosteering while drilling have been widely applied. At present, conventional measurement while drilling (MWD) technology is used to obtain well inclination angle, azimuth angle, temperature and various geological parameters in real time, so that directional engineers can timely adjust the wellbore trajectory and take various countermeasures according to the working conditions at the bottom of the well, which can effectively improve the drilling efficiency and reduce the production cost to a certain extent.

[0003] However, as the oilfield exploration and development enter the later stage, the oil layers being exploited are getting thinner and thinner, which puts forward higher requirements for wellbore trajectory control and geological parameters. In the existing conventional measurement while drilling technology, the measurement points of sensors for obtaining data such as well inclination angle, azimuth angle and geological parameters are still far from the bit. Usually, the measurement zero length is as high as 20 m, and the measurement data is relatively lagging. In order to reduce the survey zero length, the prior art generally adopts the method of adding a measurement sub-section behind the bit to achieve near-bit measurement. However, in actual application, this method will seriously reduce the build rate ability of the positive displacement motor; especially for oil and gas wells with extremely shallow layers and high build rates, the situation of trajectory out of control often occurs. Therefore, it is necessary to develop a screw structure with simple structure, easy to implement, having near-bit measurement function and the build rate not being affected.

[0004] The information disclosed in the background art part of the present invention is only intended to deepen the understanding of the general background art of the present invention, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0005] To solve the above problems, the present invention provides a screw device with near-bit measurement function and an application method thereof. The screw device is provided with a motor assembly connected to a non-magnetic drill collar. The universal shaft assembly transmits the torque and speed generated by the motor to the drive shaft assembly. The drive shaft assembly is connected to the bit and is used to drive the bit to rotate and cut the formation cuttings to complete the drilling construction. The near-bit measurement module is installed at the drive shaft assembly and realizes signal interaction with the MWD system while drilling based on the data transmission wire and the hard connection interface. The signals include control signals and measurement data signals. Using this device can solve the problems of too long measurement point distance and unstable build rate of the screw. Preferably, in one embodiment, the device includes:

[0006] a screw and a motor assembly, a universal shaft assembly, a drive shaft assembly, a near-bit measurement module, a data transmission wire and a hard connection interface arranged inside the screw; the screw is screwed and connected to the non-magnetic drill collar;

[0007] The motor assembly is connected to the non-magnetic drill collar and is used to form mechanical energy based on the drive of mud pressure;

[0008] The universal shaft assembly is connected between the motor assembly and the transmission shaft assembly and is used to transmit the torque and rotational speed generated by the motor to the transmission shaft assembly to drive the transmission shaft to rotate in a fixed axis;

[0009] The other end of the transmission shaft assembly is connected to the drill bit and is used to drive the drill bit to rotate to cut formation cuttings to complete the drilling construction;

[0010] The near-bit measurement module is installed at the transmission shaft assembly, and is connected to the MWD while drilling system through a hard connection interface after passing through a data transmission wire, and realizes the interaction of control signals and measurement data based on the hard connection interface.

[0011] Optionally, in one embodiment, the screw adopts a short bending moment structure without a bypass valve assembly, and the length of the bending point of the screw structure from the shaft head, the length of the centralizer from the drill bit, and the number of motor stages are set through a three-point fixed circle operation mechanism for the build rate.

[0012] Specifically, in a preferred embodiment, the three-point fixed circle operation mechanism for the build rate is as follows:

[0013] K = 2γ / (L1 + L2),

[0014] where K is the build rate of the screw; γ is the structural bending angle of the screw; L1 is the distance from the top of the screw to the centralizer; L2 is the distance from the centralizer to the drill bit.

[0015] In actual application, in one embodiment, the length of the bending point of the structure from the shaft head is set to 1.1 m, the length of the centralizer from the drill bit is set to 0.5 m, and the number of motor stages is 4.5.

[0016] Further, in one embodiment, the near-bit measurement module includes a main control unit and at least one measurement unit that are electrically connected. The main control unit controls the operation of the measurement unit based on the received control signal, processes the measured data, and sends it to the MWD while drilling system;

[0017] The measurement unit is used to measure the well inclination and azimuth gamma data near the drill bit in real time.

[0018] Preferably, in one embodiment, the near-bit measurement module is arranged in a placement groove opened on the outer side of the transmission shaft assembly. The near-bit measurement module is installed on the circuit board by welding, and the circuit board is fixed in the placement groove by screws.

[0019] Optionally, in one embodiment, an insulating layer and a shock-absorbing layer are provided between the circuit board and the bottom of the placement groove. A metal sealing cover is installed outside the placement groove, and a protective housing is fixedly installed outside the metal sealing cover.

[0020] Specifically, in an alternative embodiment, the measurement unit uses a MEMS sensor, which requires a short stationary time, and the stability equivalent to stationary measurement can still be maintained during mobile measurement.

[0021] Preferably, in one embodiment, the process of the main control unit processing the measured data includes conversion processing and correction operation processing, and the influence of the bending angle of the screw structure on the measurement data is offset through the correction operation processing.

[0022] In an alternative embodiment, the hard connection interface is provided at the top of the motor assembly. The hard connection interface adopts an annular structure and is fixed to the inner side of the screw by screws. The central bus is placed at the center position of the screw and is flush with the top of the screw, so that the control signal and the measurement data signal are docked with the LWD MWD system through the hard connection interface.

[0023] Based on the application aspect of the device in any one or more of the above embodiments, the present invention further provides an application method of a screw device with near-bit measurement function. This method is applied to the screw device with near-bit measurement function in any one or more of the above embodiments. This method includes:

[0024] The mud is transported through the drill pipe to the motor assembly connected to the non-magnetic drill collar, and the motor assembly rotates based on the drive of the mud pressure to form mechanical energy;

[0025] The universal shaft assembly is used to transmit the torque and speed generated by the motor to the drive shaft assembly, driving the drive shaft to rotate at a fixed axis;

[0026] The drive shaft assembly connected to the universal shaft assembly drives the drill bit to rotate and cut the formation cuttings to complete the drilling construction;

[0027] The near-bit measurement module installed at the drive shaft assembly collects the construction requirement data while drilling, and is connected to the LWD MWD system through the hard connection interface after passing through the data transmission wire to achieve data transmission to the ground.

[0028] Compared with the closest prior art, the present invention also has the following beneficial effects:

[0029] A screw device with near-bit measurement function and its application method provided by the present invention. In this device, a screw is designed to be connected to a non-magnetic drill collar; the motor assembly is connected to the non-magnetic drill collar, and based on the drive of mud pressure, a mechanical energy universal shaft assembly is formed to transmit the torque and rotational speed generated by the motor to the drive shaft assembly. The drive shaft assembly is connected to the drill bit and is used to drive the drill bit to rotate and cut formation cuttings to complete the drilling construction; a near-bit measurement module is arranged at the drive shaft assembly, and through a data transmission wire, it is connected to the MWD system while drilling through a hard connection interface, and the interaction of control signals and measurement data is realized based on the hard connection interface. By adopting this solution, by installing a near-bit measurement device on the screw body, it has the function of near-bit measurement while drilling on the basis of its original functions, and through the optimization of the structural design, the inclination-building ability of the screw is improved, which can effectively meet the construction requirements of shallow and extremely shallow high-inclination-rate oil and gas wells.

[0030] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be realized and obtained through the structures specifically pointed out in the specification, claims, and drawings. Brief Description of the Drawings

[0031] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0032] Figure 1 is a schematic structural diagram of a screw device with near-bit measurement function provided by an embodiment of the present invention;

[0033] Figure 2 is a schematic diagram of the screw structure setting of a screw device with near-bit measurement function provided by an embodiment of the present invention;

[0034] Figure 3 is a schematic diagram of the setting position of the near-bit measurement module in a screw device with near-bit measurement function provided by an embodiment of the present invention;

[0035] Figure 4 is a schematic diagram of the structural setting principle of the near-bit measurement module in a screw device with near-bit measurement function provided by an embodiment of the present invention;

[0036] Figure 5 is a schematic diagram of the design principle of the signal through-hole in a screw device with near-bit measurement function provided by an embodiment of the present invention;

[0037] Figure 6 is a schematic flowchart of the application method of a screw device with near-bit measurement function provided by an embodiment of the present invention;

[0038] In the attached drawings, 1 is a screw rod; 2 is a motor assembly; 3 is a universal shaft assembly; 4 is a drive shaft assembly; 5 is a near-bit measurement module; 6 is a data transmission wire; 7 is a hard connection interface; 8 is a placement groove; 9 is a protective housing; 10 is a signal through hole. Detailed implementation manners

[0039] The following will describe in detail the implementation manners of the present invention in combination with the attached drawings and embodiments. Thereby, those skilled in the art of the present invention can fully understand how to apply technical means to solve technical problems and achieve the implementation process of technical effects, and implement the present invention according to the above implementation process. It should be noted that as long as there is no conflict, each embodiment in the present invention and each feature of each embodiment can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0040] Although the flowcharts describe the operations as sequential processes, many of the operations can be implemented in parallel, concurrently, or simultaneously. The order of the operations can be rearranged. The process can be terminated when its operations are completed, but there can also be additional steps not included in the attached drawings. The process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0041] Computer devices include user devices and network devices. Among them, user devices or clients include, but are not limited to, computers, smart phones, PDAs (Personal Digital Assistants), etc.; network devices include, but are not limited to, a single network server, a server group composed of multiple network servers, or a cloud composed of a large number of computers or network servers based on cloud computing. The computer device can run alone to implement the present invention, or can be connected to the network and implement the present invention through interactive operations with other computer devices in the network. The network where the computer device is located includes, but is not limited to, the Internet, wide area network, metropolitan area network, local area network, VPN network, etc.

[0042] The terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments. Unless the context clearly indicates otherwise, the singular forms "a" and "an" used herein are also intended to include the plural. It should also be understood that the terms "comprises" and / or "comprising" specify the presence of the stated features, integers, steps, operations, units, and / or components, and do not preclude the presence or addition of one or more other features, integers, steps, operations, units, components, and / or combinations thereof.

[0043] During the process of oil and gas exploration and development, conventional measurement-while-drilling technology (MWD) is used to obtain the well inclination angle, azimuth angle, temperature, and various geological parameters in real time, so that directional engineers can adjust the wellbore trajectory and take various countermeasures in a timely manner according to the working conditions at the bottom of the well, which can effectively improve the drilling efficiency and reduce the production cost to a certain extent. However, as the oilfield exploration and development enter the later stage, the exploited oil layers are getting thinner and thinner, which puts higher requirements on the wellbore trajectory control and geological parameters. In the existing conventional measurement-while-drilling technology, the measurement points of the sensors used to obtain data such as well inclination angle, azimuth angle, and geological parameters are still far from the drill bit. Usually, the measurement zero length is as high as 20m, and the measurement data is relatively lagging. In order to reduce the survey zero length, the existing technology generally adopts the method of adding a measurement sub-section behind the drill bit to achieve near-bit measurement. However, in actual application, this method will seriously reduce the build rate ability of the positive displacement motor; especially for oil and gas wells with extremely shallow layers and high build rates, the situation of trajectory out of control often occurs. Therefore, it is necessary to develop a screw structure with a simple structure, easy to implement, having a near-bit measurement function and not affected by the build rate.

[0044] To solve the above problems, the present invention provides a positive displacement motor device with a near-bit measurement function and an application method. The positive displacement motor device includes a positive displacement motor and a motor assembly, a universal joint assembly, a drive shaft assembly, a near-bit measurement module, a data transmission wire, and a hard connection interface arranged inside the positive displacement motor; the motor assembly is connected to a non-magnetic drill collar, one end of the drive shaft assembly is connected to the universal joint assembly, and the other end is connected to the drill bit, which is used to drive the drill bit to rotate and cut the formation cuttings to complete the drilling construction; the near-bit measurement module is installed at the drive shaft assembly and realizes signal interaction with the MWD system while drilling based on the data transmission wire and the hard connection interface. The signals include control signals and measurement data signals. By using the device provided by the present invention, the problems of too long measurement point distance and unstable build rate of the positive displacement motor can be effectively solved.

[0045] Next, the structural components, connection methods, and functional principles of the device in the embodiment of the present invention will be described in detail based on the drawings. Although the logical order of each operation is shown in the process of describing the operating principle of the device structure, in some cases, the operations shown or described can be executed in a different order than here.

[0046] Embodiment 1

[0047] Figure 1 Fig. shows the structural schematic diagram of the positive displacement motor device with a near-bit measurement function provided by Embodiment 1 of the present invention. Referring to Figure 1 it can be seen that the device includes:

[0048] a positive displacement motor 1 and a motor assembly 2, a universal joint assembly 3, a drive shaft assembly 4, a near-bit measurement module 5, a data transmission wire 6, and a hard connection interface 7 arranged inside the positive displacement motor; the positive displacement motor 1 and the non-magnetic drill collar are connected by threads;

[0049] The motor assembly 2 is connected to the non-magnetic drill collar and is used to form mechanical energy based on the drive of mud pressure.

[0050] The universal shaft assembly 3 is connected between the motor assembly 2 and the transmission shaft assembly 4, converts the planetary motion of the motor into the fixed-axis rotation of the transmission shaft 4, and transmits the torque and rotational speed generated by the motor to the transmission shaft assembly.

[0051] One end of the transmission shaft assembly 4 is connected to the universal shaft assembly 3, and the other end is connected to the drill bit. It is used to drive the drill bit to rotate and cut the formation cuttings to complete the drilling operation.

[0052] The near-bit measurement module 5 is installed at the transmission shaft assembly 3, and is connected to the MWD system while drilling through the data transmission wire 6 through the hard connection interface 7, and realizes the interaction of control signals and measurement data based on the hard connection interface.

[0053] During the drilling process, the mud is transported to the motor assembly of the screw through the drill pipe. The motor rotor rotates around the stator axis under the drive of the mud pressure, completing the conversion of liquid pressure energy into mechanical energy. The universal shaft assembly is connected to the transmission shaft assembly to drive the drill bit to rotate and cut the formation cuttings to complete the drilling operation.

[0054] The screw 1 adopts a short bending moment structure without a bypass valve assembly. Considering that the build rate of the screw drill tool can be calculated by the three-point fixed circle method, the embodiment of the present invention sets the length of the bending point of the screw structure from the shaft head, the length of the centralizer from the drill bit, and the number of motor stages through the three-point fixed circle operation mechanism of the build rate.

[0055] Preferably, in one embodiment, the three-point fixed circle operation mechanism of the build rate is as described in the following formula:

[0056] K = 2γ / (L1 + L2),

[0057] where K is the build rate of the screw; γ is the structural bending angle of the screw; L1 is the distance from the top of the screw to the centralizer; L2 is the distance from the centralizer to the drill bit, as Figure 2 shown.

[0058] Specifically, in an optional embodiment, the length of the bending point of the structure from the shaft head is set to 1.1 m, the length of the centralizer from the drill bit is set to 0.5 m, and the number of motor stages is set to 4.5 stages.

[0059] In the embodiment of the present invention, numerical analysis is carried out based on the three-point circle-determining operation mechanism of the build-up rate. By optimizing the length of the structural bending point from the shaft head to 1.1 m, the length of the centralizer from the bit to 0.5 m, and the number of motor stages to 4.5 stages, the build-up ability of the screw structure is increased by 35% through optimizing the structural design, greatly improving the build-up ability of the screw. Based on this, the construction requirements of ultra-shallow high-build-rate oil and gas wells can also be well met.

[0060] The near-bit measurement module is connected to the MWD while drilling system through a data transmission wire and a hard connection interface, and the MWD while drilling is placed in a non-magnetic drill collar.

[0061] The non-magnetic drill collar is connected to the screw by threads. The current signal provided by the MWD while drilling system is transmitted to the near-bit measurement module through the hard connection interface and the data transmission wire to control the near-bit measurement module to measure the required data.

[0062] Correspondingly, the near-bit measurement module transmits the measurement data to the MWD while drilling system through the data transmission wire and the hard connection interface, and then transmits it to the ground through the mud pressure wave, providing real-time data feedback for the ground operation system or personnel.

[0063] In the embodiment of the present invention, the data signal is transmitted based on the data transmission wire through the wired carrier mode, which is faster than wireless transmission and the signal is stable.

[0064] The hard connection interface is arranged at the top of the motor assembly 2. The hard connection interface adopts an annular structure and is fixed to the inner side of the screw by screws. From the safety perspective, the hard connection interface should not exceed the top end of the screw. At the same time, a more convenient operation method for docking with the MWD needs to be considered. Therefore, in the embodiment of the present invention, the hard connection interface is set flush with the top end of the screw 1, and the central bus of the hard connection interface is placed at the central position of the screw 1, so that the control signal and the data transmission signal can be effectively docked with the MWD while drilling system through the hard connection interface 7. The control signal comes from the MWD while drilling system and is an electric current signal.

[0065] In the embodiment of the present invention, by installing a near-bit measurement device on the screw body, it has the function of near-bit measurement while drilling on the basis of its original function.

[0066] The near-bit measurement module includes a main control unit and at least one measurement unit that are electrically connected. The main control unit controls the operation of the measurement unit based on the received control signal, processes the measured data, and sends it to the MWD while drilling system.

[0067] The measurement unit is used for near-bit measurement of real-time well inclination and azimuth gamma data.

[0068] The number of test units in the near-bit measurement module is at least one, which are respectively and fixedly arranged in at least one placement groove 8 opened on the outer side of the drive shaft assembly 3; in practical applications, in an optional embodiment, one sensor is placed in each module placement groove; a plurality of sensors share one main control unit, and the main control unit is arranged in one of the placement grooves. A plurality of measurement units are respectively arranged in a plurality of placement grooves, as Figure 3 shown; the main control unit is integrally arranged with one of the measurement units.

[0069] The control signal is a current signal. The main control unit commands the measurement unit to start working based on the received current signal, processes the data after receiving the measurement data signal returned by the measurement unit, and then sends it to the MWD system while drilling to be transmitted to the ground operating system or personnel to provide data support for trajectory control decision-making.

[0070] The measurement unit uses a MEMS sensor, which requires a short stationary time, and the stability equivalent to stationary measurement can still be maintained under the condition of mobile measurement. In application, the MEMS sensor can measure data such as well inclination and azimuth gamma. The stationary time is only 30 s, the stationary well inclination accuracy is ±0.1°, and the stability equivalent to stationary measurement can still be maintained during mobile measurement. The researchers of the present invention apply the MEMS sensor to the operation of the near-bit measurement system, which has higher accuracy, stronger stability and longer service life than conventional probes.

[0071] In practical applications, in an optional embodiment, one sensor is placed in each module placement groove; a plurality of sensors share one main control unit, and the main control unit is arranged in one of the placement grooves.

[0072] The near-bit measurement module is placed in the notch of the measurement module placement groove, and the near-bit measurement module 5 is installed on the circuit board by welding, and the circuit board is fixed in the placement groove by screws, as Figure 4 shown;

[0073] An insulating layer and a shock-absorbing layer are arranged between the circuit board and the bottom of the placement groove, a hard sealing cover is installed outside the placement groove, and a protective housing is fixedly installed outside the hard sealing cover to maximize the safety of the instrument.

[0074] Preferably, in one embodiment, four screw positioning holes are arranged on the circuit board, namely two right-hand screws and two left-hand screws, which are diagonally distributed on the circuit board and in the notch.

[0075] A signal through hole is reserved inside the protective housing for the data transmission wire connecting the near-bit measurement module and the hard connection interface to pass through.

[0076] Specifically, a metal sealing cover is installed outside the notch, and a protective housing is fixedly installed outside the metal sealing cover. One or more signal holes that penetrate through the inside and outside are arranged in the protective housing for placing data transmission wires. For example, the signal holes can be set as hollow channels inside the protective housing and can be arranged longitudinally or horizontally parallel to the surface of the screw rod. As Figure 5 shown; based on this, the near-bit measurement module is connected to the hard connection interface through the data transmission wire, and such a design can provide good protection for the data transmission wire and greatly reduce the possibility of it being soaked or worn.

[0077] In the process of the main control unit processing the measured data, it includes conversion processing and correction operation processing. The influence of the bending angle of the screw rod structure on the measurement data is offset through the correction operation processing. After receiving the measurement data, the main control unit first performs conversion and then correction.

[0078] During the correction operation processing, according to the well inclination and tool face measured by each sensor, the correction algorithm of the near-bit measurement sub-joint is introduced to obtain the relative position between the sensor and the positive displacement motor, and the position data of the sensor is comprehensively calculated to obtain the well inclination data of the central axis of the positive displacement motor, and then the correction operation is performed.

[0079] In the positive displacement motor device with near-bit measurement function provided by the embodiments of the present invention, each module or unit structure can operate independently or in combination according to the actual structural connection requirements and signal processing requirements to achieve the corresponding technical effects.

[0080] Embodiment 2:

[0081] In the above embodiments publicly disclosed by the present invention, the device is described in detail. Based on other aspects of the device described in any one or more of the above embodiments, the present invention also provides an application method of a positive displacement motor device with near-bit measurement function, and this method is applied to the positive displacement motor device with near-bit measurement function described in any one or more of the above embodiments. Specific embodiments are given below for detailed description.

[0082] Specifically, Figure 6 shows a schematic flow chart of the application method of the positive displacement motor device with near-bit measurement function provided by the embodiments of the present invention. As Figure 6 shown, this method includes:

[0083] The mud is transported through the drill pipe to the motor assembly connected to the non-magnetic drill collar, and the motor assembly rotates based on the drive of the mud pressure to form mechanical energy;

[0084] The torque and rotational speed generated by the motor are transmitted to the drive shaft assembly by using the universal shaft assembly, driving the drive shaft to rotate in a fixed axis;

[0085] The drill bit is driven to rotate by the drive shaft assembly connected to the universal shaft assembly to cut the formation cuttings, completing the drilling construction;

[0086] During the drilling operation, the near-bit measurement module installed at the drive shaft assembly collects the construction requirement data in real time. After passing through the data transmission wire, it is connected to the MWD system while drilling through a hard connection interface to achieve data transmission to the surface.

[0087] Among them, the screw device with near-bit measurement function applied includes a screw, and a motor assembly, a universal shaft assembly, a drive shaft assembly, a near-bit measurement module, a data transmission wire, and a hard connection interface arranged inside the screw; the screw is screwed and connected to the non-magnetic drill collar;

[0088] The motor assembly is connected to the non-magnetic drill collar and is used to form mechanical energy based on the drive of the mud pressure;

[0089] The universal shaft assembly is connected between the motor assembly and the drive shaft assembly and is used to transmit the torque and rotational speed generated by the motor to the drive shaft assembly to drive the drive shaft to rotate around a fixed axis;

[0090] The other end of the drive shaft assembly is connected to the drill bit and is used to drive the drill bit to rotate and cut the formation cuttings to complete the drilling construction;

[0091] The near-bit measurement module is installed at the drive shaft assembly. After passing through the data transmission wire, it is connected to the MWD system while drilling through a hard connection interface, and the interaction of control signals and measurement data is realized based on the hard connection interface.

[0092] Optionally, in one embodiment, the screw adopts a short bending moment structure without a bypass valve assembly, and the lengths of the screw structure bending point from the shaft head, the stabilizer from the drill bit, and the number of motor stages are set through the three-point fixed circle operation mechanism of the build-up rate.

[0093] Specifically, in a preferred embodiment, the three-point fixed circle operation mechanism of the build-up rate is as follows:

[0094] K = 2γ / (L1 + L2),

[0095] where K is the build-up rate of the screw; γ is the structural bending angle of the screw; L1 is the distance from the top of the screw to the stabilizer; L2 is the distance from the stabilizer to the drill bit.

[0096] In actual application, in one embodiment, the length of the structural bending point from the shaft head is set to 1.1 m, the length of the stabilizer from the drill bit is set to 0.5 m, and the number of motor stages is set to 4.5.

[0097] Furthermore, in one embodiment, the near-bit measurement module includes a main control unit and at least one measurement unit that are electrically connected. The main control unit controls the operation of the measurement unit based on the received control signal, processes the measured data, and sends it to the MWD system while drilling;

[0098] The measurement unit is used to measure the well inclination and azimuth gamma data in real time during near-bit drilling.

[0099] Preferably, in one embodiment, the near-bit measurement module is disposed in a placement groove opened on the outer side of the drive shaft assembly. The near-bit measurement module is mounted on the circuit board by welding, and the circuit board is fixed in the placement groove by screws.

[0100] Optionally, in one embodiment, an insulating layer and a shock-absorbing layer are provided between the circuit board and the bottom of the placement groove. A metal sealing cover is installed outside the placement groove, and a protective housing is fixedly installed outside the metal sealing cover.

[0101] Specifically, in an alternative embodiment, the measurement unit uses a MEMS sensor, which requires a short stationary time, and the stability equivalent to stationary measurement can still be maintained during mobile measurement.

[0102] Preferably, in one embodiment, the process of the main control unit processing the measured data includes conversion processing and correction operation processing, and the influence of the bend angle of the screw structure on the measurement data is offset through the correction operation processing.

[0103] In an alternative embodiment, the hard connection interface is disposed at the top of the motor assembly. The hard connection interface adopts an annular structure, is fixed to the inner side of the screw by screws, and the central bus is placed at the center position of the screw and is flush with the top end of the screw, so that the control signal and the measurement data signal are docked with the MWD system while drilling through the hard connection interface.

[0104] For the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0105] It should be noted that in other embodiments of the present invention, the method can also be combined with one or several of the above embodiments to obtain a new application method of the screw device with near-bit measurement function, so as to realize the optimized application of the drilling screw device.

[0106] It should be noted that based on the method in any one or more of the above embodiments of the present invention, the present invention also provides a storage medium, on which program codes capable of implementing the methods described in any one or more of the above embodiments are stored. When the codes are executed by an operating system, the application method of the screw device with near-bit measurement function as described above can be realized.

[0107] It should be understood that the embodiments disclosed in the present invention are not limited to the specific structures, processing steps or materials disclosed herein, but should extend to equivalent alternatives of these features understood by those of ordinary skill in the relevant art. It should also be understood that the terms used herein are for the purpose of describing specific embodiments only and do not imply limitation.

[0108] As used herein, the phrase "one embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the phrase "one embodiment" appearing throughout the specification does not necessarily refer to the same embodiment.

[0109] Although the embodiments disclosed in the present invention are as described above, the content described is only an embodiment adopted for the convenience of understanding the present invention and is not intended to limit the present invention. Any person skilled in the art within the technical field to which the present invention pertains may make any modifications and variations in the form of implementation and details without departing from the spirit and scope disclosed by the present invention. However, the scope of patent protection of the present invention shall still be subject to the scope defined by the appended claims.

Claims

1. A screw device with near-bit measurement function, characterized in that, The device includes: a screw rod, and a motor assembly, a universal shaft assembly, a transmission shaft assembly, a near-bit measurement module, a data transmission wire, and a hard connection interface arranged inside the screw rod; the screw rod is screwed and connected to a non-magnetic drill collar; the motor assembly is connected to the non-magnetic drill collar and is used to form mechanical energy based on the drive of mud pressure; the universal shaft assembly is connected between the motor assembly and the transmission shaft assembly and is used to transmit the torque and rotational speed generated by the motor to the transmission shaft assembly to drive the transmission shaft to rotate in a fixed axis; the other end of the transmission shaft assembly is connected to the drill bit and is used to drive the drill bit to rotate to cut formation cuttings to complete drilling construction; the near-bit measurement module is installed at the transmission shaft assembly, and after passing through the data transmission wire, it is connected to the MWD system while drilling through the hard connection interface, and the interaction of control signals and measurement data is realized based on the hard connection interface.

2. The device according to claim 1, characterized in that, The screw rod adopts a short bending moment structure without a bypass valve assembly, and the length of the bending point of the screw rod structure from the shaft head, the length of the centralizer from the drill bit, and the number of motor stages are set through a three-point fixed circle operation mechanism for the build rate.

3. The device according to claim 2, characterized in that, The three-point fixed circle operation mechanism for the build rate is as follows: K = 2γ / (L1 + L2), where K is the build rate of the screw rod; γ is the structural bending angle of the screw rod; L1 is the distance from the top of the screw rod to the centralizer; L2 is the distance from the centralizer to the drill bit.

4. The device according to claim 1, characterized in that, The near-bit measurement module includes a main control unit and at least one measurement unit that are electrically connected. The main control unit controls the operation of the measurement unit based on the received control signal, processes the measured data, and sends it to the MWD system while drilling; the measurement unit is used for near-bit measurement of real-time well inclination and azimuth gamma data.

5. The device according to claim 4, characterized in that, The near-bit measurement module is arranged in a placement groove opened on the outer side of the transmission shaft assembly. The near-bit measurement module is installed on the circuit board by welding, and the circuit board is fixed in the placement groove by screws.

6. The device according to claim 5, characterized in that, An insulating layer and a shock-absorbing layer are arranged between the circuit board and the bottom of the placement groove. A metal sealing cover is installed on the outer side of the placement groove, and a protective housing is fixedly installed outside the metal sealing cover.

7. The device according to claim 6, characterized in that, The measurement unit adopts a MEMS sensor, requires a short static time, and can still maintain the stability equivalent to static measurement in the case of mobile measurement.

8. The device according to claim 4, characterized in that, The process of the main control unit processing the measured data includes conversion processing and correction operation processing, and the influence of the structural bending angle of the screw rod on the measurement data is offset through the correction operation processing.

9. The device according to claim 1, characterized in that, The hard connection interface is arranged at the top of the motor assembly. The hard connection interface adopts an annular structure, is fixed to the inner side of the screw rod by screws, the central bus is placed at the central position of the screw rod, and is flush with the top of the screw rod, so that the control signal and the measurement data signal are docked with the MWD system while drilling through the hard connection interface.

10. An application method of a screw device with near-bit measurement function, characterized in that, The method is applied to the screw rod device with a near-bit measurement function as described in any one of claims 1 to 9. The method includes: The mud is transported through the drill pipe to the motor assembly connected to the non-magnetic drill collar, and the motor assembly rotates based on the drive of the mud pressure to form mechanical energy; The universal shaft assembly is used to transmit the torque and rotational speed generated by the motor to the transmission shaft assembly to drive the transmission shaft to rotate in a fixed axis; The transmission shaft assembly connected to the universal shaft assembly drives the drill bit to rotate to cut formation cuttings to complete drilling construction; During drilling operations, construction requirement data is collected in real-time by a near-bit measurement module installed on the drive shaft assembly. After being transmitted through a data transmission wire, the data is connected to the MWD system while drilling via a hard connection interface to achieve data transmission to the ground.

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