Intelligent self-control friction-reducing, resistance-reducing and speed-increasing composite screw drilling tool

Abstract

The invention relates to an intelligent self-control friction-reducing, resistance-reducing and speed-increasing composite screw drill which comprises a forward straight screw drill, an intelligent self-control friction-reducing, resistance-reducing and speed-increasing system, a tool face angle measuring system, an MWD (measurement while drilling) short circuit and a forward single-bend screw drill. The forward straight screw drill comprises an upper valve body, an upper motor assembly barrel, an upper universal shaft barrel, an upper transmission shaft and an upper centralizer, and the forward single-bend screw drill comprises a lower valve body. According to the intelligent self-control friction-reducing, resistance-reducing and speed-increasing composite screw drill, the friction-reducing, resistance-reducing and speed-increasing effects can be automatically achieved through an intelligent control means.

Description

Technical Field

[0001] The invention belongs to the field of petroleum drilling tools, and in particular relates to an intelligent self-controlled composite screw drilling tool for reducing friction, drag and speed. Background Art

[0002] At present, screw drill bits are widely used in directional wells, cluster wells and horizontal wells, and have become a commonly used downhole power drill bit in the drilling process of offshore oil and gas fields. When the screw drill bit is in the process of directional inclination / decline sliding drilling, the upper drill string stops rotating to ensure that the tool face of the screw drill bit is in a stable state; however, the upper drill string stops rotating, which will cause huge axial friction between the upper drill string and the well wall, especially in the long horizontal section horizontal well and large displacement well drilling process. The pressure is very serious, which leads to poor transmission of drilling pressure and low mechanical drilling speed. When the screw drill bit is adjusting the wellbore trajectory, the rotation angle of the upper drill string is adjusted according to actual needs, and the tool face angle is rotated to the expected angle through the measurement while drilling instrument. The inability to autonomously control the pressure and tool face has become a serious restriction on the application of conventional screw drill bits in complex drilling processes.

[0003] In order to solve the above shortcomings of screw drill bits in directional drilling, rotary steering technology has been developed at home and abroad, which allows the upper drill string to rotate throughout the entire process and effectively control the trajectory of the wellbore. This drilling method greatly reduces the friction of the upper drill string, and the drilling pressure is transmitted smoothly, the mechanical drilling speed is high, and the wellbore quality is good. However, foreign rotary steering systems are still in an international monopoly state, and the rental costs are expensive; the existing rotary steering systems in China are expensive to use and maintain, which is not conducive to reducing drilling costs. At present, only a few key long horizontal wells in China use rotary steering systems. The high cost of use is not conducive to the use of conventional drilling, and it is difficult to meet the current needs of "short, flat, and fast" precision drilling and optimal drilling. Summary of the invention

[0004] In order to solve all or part of the above problems, the purpose of the present invention is to provide an intelligent self-controlled composite screw drill with reduced friction, reduced drag and increased speed, so as to provide a screw drill that can automatically produce the effect of reduced friction, reduced drag and increased speed through intelligent control means.

[0005] The present invention provides an intelligent self-controlled friction reduction, drag reduction and speed-up composite screw drilling tool, comprising: a forward straight screw drilling tool, an intelligent self-controlled friction reduction, drag reduction and speed-up system, a tool face angle measurement system, an MWD measurement while drilling short-circuit, and a forward single-bend screw drilling tool. The forward straight screw drilling tool comprises an upper valve body, an upper motor assembly cylinder, an upper universal shaft cylinder, an upper transmission shaft, and an upper stabilizer. The forward single-bend screw drilling tool comprises a lower valve body; wherein, the lower end of the straight screw upper valve body is connected to the upper end of the intelligent self-controlled friction reduction, drag reduction and speed-up system, the lower end of the intelligent self-controlled friction reduction, drag reduction and speed-up system is connected to the upper end of the upper motor assembly cylinder of the forward straight screw drilling tool, the lower end of the upper motor assembly cylinder is connected to the upper end of the upper universal shaft cylinder, the lower end of the upper universal shaft cylinder is connected to the upper end of the upper stabilizer, the upper end of the upper transmission shaft can rotate freely in the upper stabilizer, the lower end of the upper transmission shaft is connected to the upper end of the tool face angle measurement system, and the tool face angle The lower end of the measurement system is connected to the upper end of the MWD measurement while drilling system, and the lower end of the MWD measurement while drilling system is connected to the upper end of the lower valve body of the single-bend screw through a tapered thread. The forward straight screw drill adopts a hollow forward screw. The intelligent automatic friction reduction and drag reduction speed-up system is used to automatically adjust the mud displacement flowing into the forward straight screw drill and the forward single-bend screw drill, so as to adjust the forward torque of the forward straight screw drill and the reverse torque of the forward single-bend screw drill; the tool face angle measurement system is used to measure the angle of the tool face in real time, and wirelessly transmit the measured signal to the intelligent automatic friction reduction and drag reduction speed-up system. The intelligent automatic friction reduction and drag reduction speed-up system automatically adjusts the distribution of mud displacement according to the received signal, so as to automatically achieve the balance of the tool face; the ground pressure control command cooperates with the tool face angle measurement system and the MWD measurement while drilling to short-circuit and adjust the tool face angle, so as to achieve the regulation of the wellbore trajectory.

[0006] In some embodiments, the forward straight screw drilling tool also includes: a valve sleeve, a hollow forward screw, an upper universal joint, an upper short-circuit, a hollow forward screw channel, a hollow forward screw radial channel, an upper universal joint annulus channel, an upper short-circuit radial channel, and an upper transmission shaft channel; wherein the upper end of the straight screw upper valve body is used to be connected to the upper drill string so that the upper valve body can rotate forward along with the upper drill string.

[0007] In some embodiments, the forward single-bend screw drilling tool also includes: a valve sleeve, a connecting short circuit, a lower motor assembly barrel, a forward screw, a lower universal shaft, a lower universal shaft barrel, a lower short circuit, a lower stabilizer, a lower transmission shaft, an upper annulus channel of the forward screw, an annulus channel of the lower universal shaft, a lower short circuit radial channel, and a lower transmission shaft channel; wherein, the lower end of the lower valve body is connected to the upper end of the connecting short circuit, the lower end of the connecting short circuit is connected to the upper end of the lower motor assembly barrel, the lower end of the lower motor assembly barrel is connected to the upper end of the lower universal shaft barrel, the lower end of the lower universal shaft barrel is connected to the upper end of the lower stabilizer, the upper transmission shaft rotates together with the tool face angle measurement system, the MWD measurement while drilling system, the lower valve body, the connecting short circuit, the lower motor assembly barrel, the lower universal shaft barrel, and the lower stabilizer, and the rotation of the lower stabilizer constitutes the rotation of the tool face of the forward single-bend screw drilling tool.

[0008] In some embodiments, the intelligent self-controlled friction reduction and drag reduction speed-up system includes: an outer tube, a lower connecting short circuit, a fastening ring, a center tube, a protective tube, a connecting short circuit, a transmission shaft, a connecting buckle, a valve body, a closing base, a hollow titanium alloy flexible shaft, a reset spring, a closing valve sleeve, a venturi tube flow detector, a valve core, a connecting pair of wires, a sealing top ring, a motor reducer combination, a motor reducer protection tube, a connecting pair of wires short circuit, a motor drive circuit, a motor drive circuit protection tube, and a motor drive circuit bracket; wherein the upper end of the valve body and the lower end of the center tube are statically connected. Sealed connection, the upper end of the valve body is sealed and inserted into and fixed to the lower end of the protective tube, the upper end of the center tube is statically sealed and connected to the upper end of the protective tube, a deep groove ball bearing is sleeved on the upper step surface of the protective tube, and the fastening ring is used to fix the deep groove ball bearing on the upper step surface of the protective tube and fixed with a locking pin; the protective tube and the outer tube form a rotating dynamic seal; the Venturi tube flow detector is fixed and sealed and inserted into the channel on the valve body; the valve core is inserted into the Venturi tube flow detector and can move freely driven by the transmission shaft, and the valve core and the Venturi tube flow detector The venturi tube flow detector is provided with radially connected valve holes, four pressure-taking holes in the contraction section and a pressure-taking hole in the throat section in the circumferential direction; the lower end of the transmission shaft and the valve core form a screw transmission mechanism, and the upper end of the transmission shaft is fixedly connected to the motor reducer combination; the motor reducer combination is fixed on the connecting short circuit and inserted into the motor reducer protection tube, the lower end of the motor reducer protection tube is sealed and connected to the connecting short circuit, and the upper end of the motor reducer protection tube is sealed and connected to the connecting short circuit; the motor drive circuit is fixed on the motor drive circuit bracket, and the connecting short circuit is connected to the motor reducer protection tube. The short circuit and the motor drive circuit bracket are sealed and connected with the motor drive circuit protection tube; the lower end of the connecting short circuit is sealed and connected with the upper end of the connecting buckle, and the connecting buckle and the transmission shaft form a rotating seal; the lower end of the connecting buckle is sealed and connected with the upper end of the connecting thread, and the lower end of the connecting thread is sealed and connected with the upper end of the Venturi tube flow sensor, the closing valve sleeve and the closing base are sealably inserted into the center hole at the lower end of the valve body, and the lower end of the closing valve sleeve is inserted into the closing base and can slide freely; the hollow titanium alloy flexible shaft is sealed and connected with the valve body, and the hollow titanium alloy flexible shaft is sealed and connected with the upper transmission shaft.

[0009] In some embodiments, the intelligent self-controlled friction reduction and drag reduction speed-up system also includes: No. 1 connecting annular groove, contraction section pressure hole, No. 2 connecting annular groove, pore throat section pressure hole, valve body pore throat radial pressure hole, valve body contraction section radial pressure hole, first pressure channel, second pressure channel and flow detection mechanism, the flow detection mechanism includes: No. 1 pressure sensor, No. 2 pressure sensor and venturi tube flow detector; wherein, No. 1 pressure sensor is sealed and fixed on the valve body and is connected to the first pressure channel, the first pressure channel is connected to the valve body pore throat radial pressure hole, No. 2 connecting The annular groove is connected to the pore throat section pressure taking hole, and pressure sensor No. 1 is used to measure the pore throat section pressure of the Venturi tube flow detector, and the other end of pressure sensor No. 1 is electrically connected to rectangular circuit board protection tube No. 1; pressure sensor No. 2 is sealed and fixed on the valve body and is connected to the second pressure taking channel, and the second pressure taking channel is connected to the radial pressure taking hole of the contraction section of the valve body, No. 1 connecting annular groove and the contraction section pressure taking hole, and pressure sensor No. 2 is used to measure the contraction section pressure of the Venturi tube flow detector, and the other end of pressure sensor No. 2 is electrically connected to rectangular circuit board protection tube No. 1.

[0010] In some embodiments, the intelligent self-controlled friction reduction, drag reduction and speed increase system also includes a third pressure channel, a valve body center hole and a downhole information monitoring mechanism. The downhole information monitoring mechanism includes a No. 3 pressure sensor. The No. 3 pressure sensor is sealed and fixed on the valve body and is connected to the third pressure channel. The third pressure channel is connected to the valve body center hole. The No. 3 pressure sensor is used to measure the mud fluid pressure change in the valve body center hole. The other end of the No. 3 pressure sensor is electrically connected to the No. 1 rectangular circuit board protective tube.

[0011] In some embodiments, the intelligent automatic control friction reduction, drag reduction and speed increase system also includes: No. 1 rectangular circuit board protection tube, No. 1 rectangular circuit board protection tube includes a sealing plug, an intelligent automatic control friction reduction, drag reduction and speed increase system main control circuit, a rectangular circuit protection tube, and a circuit board bracket; wherein, the sealing plug is fixedly and sealingly inserted into the upper end of the rectangular circuit protection tube, the circuit board bracket is fixedly and sealingly inserted into the lower end of the rectangular circuit protection tube, and the main control circuit of the intelligent automatic control friction reduction, drag reduction and speed increase system is fixed on the circuit board bracket.

[0012] In some embodiments, the intelligent self-controlled friction reduction and drag speed increase system also includes: No. 2 rectangular circuit board protection tube, No. 2 rectangular circuit board protection tube includes a circuit board bracket, a rectangular circuit protection tube, a power supply battery, a wireless communication circuit, and a sealing plug; wherein the circuit board bracket is sealably inserted into the upper end of the rectangular circuit protection tube, the sealing plug is sealably inserted into the lower end of the rectangular circuit protection tube, the wireless communication circuit and the power supply battery are fixed on the circuit board bracket, and the wireless communication circuit is electrically connected to the power supply battery.

[0013] In some embodiments, the intelligent automatic control friction reduction, drag reduction and speed increase system includes a wireless communication mechanism, which includes: a wireless communication circuit, which is connected to the main control circuit of the intelligent automatic control friction reduction, drag reduction and speed increase system via RS485 communication method, and transmits the tool face angle information measured by the tool face angle measurement system in real time to the main control circuit of the intelligent automatic control friction reduction, drag reduction and speed increase system for processing.

[0014] In some embodiments, the tool face angle measurement system includes: a protective tube, a fixed top ring, a sealing plug, a tool face angle measurement circuit, a wireless communication circuit, a power supply battery, a fixed top ring, a circuit board bracket, and a circuit board protective tube; wherein, the guide key of the circuit board protective tube is inserted into the guide groove in the protective tube, and the upper and lower ends are respectively fixed by the fixed top ring; the sealing plug is inserted into and sealedly connected to the upper end of the circuit board protective tube, and the circuit board bracket is inserted into and sealedly connected to the lower end of the circuit board protective tube; the tool face angle measurement circuit, the wireless communication circuit and the power supply battery are fixed on the circuit board bracket, and the tool face angle measurement circuit, the wireless communication circuit and the power supply battery are electrically connected.

[0015] It can be seen from the above technical scheme that the intelligent self-control friction reduction, drag reduction and speed-up composite screw drill of the present invention is based on the forward straight screw drill and the forward single-bend screw drill, and an intelligent self-control friction reduction, drag reduction and speed-up system is added. When directional sliding drilling is performed, the intelligent self-control friction reduction, drag reduction and speed-up system controls the torque of the forward straight screw drill to adjust the counter-torque of the forward single-bend screw drill, thereby effectively controlling the angle of rotation of the tool face to achieve controllable wellbore trajectory, and the upper drill string can rotate forward to smoothly transmit drilling pressure, effectively solving the problems of support pressure and low mechanical drilling speed generated by conventional screw drills during sliding drilling. When composite drilling is performed, the forward straight screw drill accelerates the rotation of the single-bend screw drill to further increase the drilling speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the main structure of the intelligent self-controlled friction-reducing, drag-reducing and speed-increasing composite screw drilling tool according to an embodiment of the present invention;

[0017] Figure 2 It is a side view structural schematic diagram of an intelligent self-controlled friction-reducing, drag-reducing and speed-increasing composite screw drilling tool according to an embodiment of the present invention;

[0018] Figure 3 for Figure 2 The cross-sectional structural diagram of the intelligent self-controlled composite screw drilling tool for reducing friction, drag and speed is shown;

[0019] Figure 4 It is a cross-sectional structural schematic diagram of an intelligent self-controlled friction reduction and drag reduction speed-increasing system according to an embodiment of the present invention;

[0020] Figure 5 for Figure 4A partial cross-sectional structural diagram of the intelligent self-controlled friction reduction and drag reduction speed-increasing system shown;

[0021] Figure 6 for Figure 4 A partial cross-sectional structural diagram of an intelligent self-controlled friction reduction and drag reduction speed-increasing system is shown;

[0022] Figure 7 for Figure 4 The structural schematic diagram of the intelligent self-control friction reduction and drag reduction speed-up system shown in the figure is along the AA direction;

[0023] Figure 8 for Figure 4 The structural schematic diagram of the intelligent self-control friction reduction and drag reduction speed-up system shown in FIG.

[0024] Fig. 9 for Figure 4 The structural schematic diagram of the intelligent self-control friction reduction and drag reduction speed-increasing system along the CC direction is shown;

[0025] Fig.10 for Figure 4 The structural schematic diagram of the intelligent self-control friction reduction and drag reduction speed-increasing system along the DD direction is shown;

[0026] Fig.11 It is a front structural sectional view of a tool face angle measurement system according to an embodiment of the present invention;

[0027] Fig.12 This is a front structural cross-sectional view of a No. 1 rectangular circuit board protection tube according to an embodiment of the present invention;

[0028] Fig.13 This is a front structural sectional view of a No. 2 rectangular circuit board protection tube according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to better understand the purpose, structure and function of the present invention, the following is a further detailed description of an intelligent self-controlled friction reduction, drag reduction and speed-increasing composite screw drilling tool of the present invention in conjunction with the accompanying drawings.

[0030] Figure 1 The main structure of the intelligent self-controlled friction-reducing, drag-reducing and speed-increasing composite screw drilling tool 100 according to an embodiment of the present invention is shown. Figure 2 The side view structure of the intelligent self-controlled friction-reducing, drag-reducing and speed-increasing composite screw drilling tool 100 according to an embodiment of the present invention is shown. Figure 3 The cross-sectional structure of the intelligent self-controlled friction reduction, drag reduction and speed-increasing composite screw drilling tool 100 according to an embodiment of the present invention is shown. Figures 1 to 3As shown, the intelligent automatic friction reduction, drag reduction and speed-up composite screw drilling tool 100 comprises: a forward straight screw drilling tool 1, an intelligent automatic friction reduction, drag reduction and speed-up system 2, a tool face angle measurement system 3, an MWD measurement while drilling short circuit 4, a forward single-bend screw drilling tool 5, the forward straight screw drilling tool 1 comprises a straight screw upper valve body 11, an upper motor assembly barrel 13, an upper universal shaft barrel 15, a straight screw upper transmission shaft 18, and an upper stabilizer 19, and the forward single-bend screw drilling tool 5 comprises a single-bend screw lower valve body 51; wherein The lower end of the straight screw upper valve body 11 is connected to the upper end of the intelligent automatic friction reduction and drag reduction speed-up system 2, the lower end of the intelligent automatic friction reduction and drag reduction speed-up system 2 is connected to the upper end of the upper motor assembly cylinder 13, the lower end of the upper motor assembly cylinder 13 is connected to the upper end of the upper universal shaft cylinder 15, the lower end of the upper universal shaft cylinder 15 is connected to the upper end of the upper stabilizer 19, the upper end of the straight screw upper transmission shaft 18 can rotate freely in the upper stabilizer 19, and the lower end of the straight screw upper transmission shaft 18 is connected to the tool face angle measurement The upper end of the tool face angle measurement system 3 is connected to the upper end of the MWD while drilling measurement system 4, the lower end of the MWD while drilling measurement system 4 is connected to the upper end of the single-bend screw lower valve body 51 through a tapered thread, the forward straight screw drilling tool 1 adopts a hollow forward screw 14, and the intelligent automatic control friction reduction and drag reduction speed-up system 2 is used to automatically adjust the mud displacement flowing into the forward straight screw drilling tool 1 and the forward single-bend screw drilling tool 5, so as to adjust the forward torque of the forward straight screw drilling tool 1 and the reverse torque of the forward single-bend screw drilling tool 5; the tool face angle measurement system 3 is used to measure the angle of the tool face in real time, and wirelessly transmit the measured signal to the intelligent automatic control friction reduction and drag reduction speed-up system 2, and the intelligent automatic control friction reduction and drag reduction speed-up system 2 automatically adjusts the distribution of mud displacement according to the received signal, so as to automatically achieve the balance of the tool face; the ground pressure control command cooperates with the tool face angle measurement system 3 and the MWD while drilling measurement short circuit 4 to adjust the tool face angle, so as to achieve the regulation of the wellbore trajectory.

[0031] Please continue to refer to Figures 1 to 3 In some embodiments, the forward straight screw drilling tool 1 also includes: a straight screw valve sleeve 12, a hollow forward screw 14, an upper universal shaft 16, an upper short-circuit 17, a hollow forward screw channel 101, a hollow forward screw radial channel 102, an upper universal shaft annular channel 103, an upper short-circuit radial channel 104, and an upper transmission shaft channel 105; wherein, the upper end of the straight screw upper valve body 11 is used to be connected to the upper drill string so that the straight screw upper valve body 11 can rotate forward along with the upper drill string.

[0032] Please continue to refer to Figures 1 to 3In some embodiments, the forward single-bend screw drilling tool 5 further includes: a single-bend screw valve sleeve 52, a single-bend screw connecting short circuit 53, a lower motor assembly barrel 54, a forward screw 55, a lower universal shaft 56, a lower universal shaft barrel 57, a lower short circuit 58, a lower centralizer 59, a single-bend screw lower transmission shaft 510, a forward screw upper annular passage 501, a lower universal shaft annular passage 502, a lower short circuit radial passage 503, and a lower transmission shaft passage 504; wherein the lower end of the single-bend screw lower valve body 51 is connected to the upper end of the single-bend screw connecting short circuit 53, and the single-bend screw connecting short circuit 53 is connected to the lower end of the single-bend screw lower valve body 51. The lower end of the connection 53 is connected to the upper end of the lower motor assembly cylinder 54, the lower end of the lower motor assembly cylinder 54 is connected to the upper end of the lower universal shaft cylinder 57, the lower end of the lower universal shaft cylinder 57 is connected to the upper end of the lower stabilizer 59, the straight screw upper transmission shaft 18 rotates together with the tool face angle measurement system 3, the MWD while drilling measurement system 4, the single-bend screw lower valve body 51, the single-bend screw connecting short circuit 53, the lower motor assembly cylinder 54, the lower universal shaft cylinder 57, and the lower stabilizer 59, and the rotation of the lower stabilizer 59 constitutes the rotation of the tool face of the positive single-bend screw drilling tool 5.

[0033] Please refer to Figures 4 to 10In some embodiments, the intelligent automatic control friction reduction and drag reduction speed-up system 2 includes: an outer cylinder 21, a system lower connection short circuit 22, a fastening ring 23, a central trustee 28, a system protection cylinder 29, a system connection short circuit 211, a transmission shaft 212, a connection buckle 214, a valve body 222, a closing base 224, a hollow titanium alloy flexible shaft 226, a return spring 229, a closing valve sleeve 230, a venturi tube flow detector 231, a valve core 233, a connection pair 234, a sealing top ring 239, a motor reducer assembly 245, a motor reducer protection cylinder 246, a connection pair short circuit 248, a motor drive circuit 252, a motor drive circuit protection cylinder 253, and a motor drive circuit bracket 255; wherein, the valve The upper end of the valve body 222 is statically sealed with the lower end of the center tube 28, the upper end of the valve body 222 is sealed and inserted into and fixed to the lower end of the system protection tube 29, the upper end of the center tube 28 is statically sealed with the upper end of the system protection tube 29, a deep groove ball bearing is sleeved on the upper step surface of the system protection tube 29, the fastening ring 23 is used to fix the deep groove ball bearing on the upper step surface of the system protection tube 29, and is fixed with a locking pin; the system protection tube 29 and the outer tube 21 form a rotating dynamic seal; the venturi tube flow detector 231 is fixed and sealed and inserted into the channel on the valve body 222; the valve core 233 is inserted into the venturi tube flow detector 231 and can move freely under the drive of the transmission shaft 212, and the valve core 233 and the venturi tube The flow detector 231 forms a sliding dynamic seal, and the venturi tube flow detector 231 is circumferentially provided with a radially connected valve hole, four contraction section pressure taking holes and a throat section pressure taking hole; the lower end of the transmission shaft 212 and the valve core 233 form a screw transmission mechanism, and the upper end of the transmission shaft 212 is fixedly connected to the motor reducer assembly 245; the motor reducer assembly 245 is fixed on the system connection short circuit 211 and inserted into the motor reducer protection tube 246, the lower end of the motor reducer protection tube 246 is sealedly connected to the system connection short circuit 211, and the upper end of the motor reducer protection tube 246 is sealedly connected to the connection short circuit 248; the motor drive circuit 252 is fixed on the motor drive circuit bracket 255, and the connection short circuit 234, the motor reducer protection tube 246 are sealedly connected to the connection short circuit 248; The motor drive circuit bracket 255 is sealed and connected to the motor drive circuit protection tube 253; the lower end of the system connection short circuit 211 is sealed and connected to the upper end of the connecting buckle 214, and the connecting buckle 214 and the transmission shaft 212 form a rotating seal; the lower end of the connecting buckle 214 is sealed and connected to the upper end of the connecting thread 234, and the lower end of the connecting thread 234 is sealed and connected to the upper end of the venturi tube flow sensor 231, the closing valve sleeve 230 and the closing base 224 are sealed and inserted into the center hole at the lower end of the valve body 222, and the lower end of the closing valve sleeve 230 is inserted into the closing base 224 and can slide freely; the hollow titanium alloy flexible shaft 226 is sealed and connected to the valve body 222, and the hollow titanium alloy flexible shaft 226 is sealed and connected to the transmission shaft 18 on the straight screw.

[0034] In the present application, the intelligent automatic control friction reduction and drag reduction speed-up system 2 also includes locking pins, several elastic retaining rings for holes, two deep groove ball bearings, Che's mud special seal, several O-rings, fastening pins, Che's C-shaped seal, elastic retaining rings for shafts, transmission shaft fastening pins, coupling 242, motor reducer output shaft fastening pins, motor reducer fastening hexagon socket screws, eight-core power sealing joint 249, five-core power sealing joint 257, fixing screws, injection hole NPT sealing plug 260, exhaust hole NPT sealing plug 261.

[0035] Through the above settings, the specific connection method of the intelligent automatic control friction reduction and drag reduction speed-up system 2 in this application is as follows:

[0036] The upper end of the valve body 222 is connected to the lower end of the center tube 28 through a flat thread, and a static seal is formed by two O-rings. The upper end of the valve body 222 is inserted into the lower end of the system protection tube 29, and a static seal is formed by two O-rings. The valve body 222 and the system protection tube 29 are locked by the fastening pin 217 to prevent the system protection tube 29 from rotating. The upper end of the system protection tube 29 is connected to the upper end of the protection tube 31 through a flat thread, and a static seal is formed by two O-rings. The deep groove ball bearing is sleeved on the upper step surface of the system protection tube 29, and the fastening ring 23 fixes the inner bearing of the deep groove ball bearing on the upper step surface of the system protection tube 29 through a flat thread. The locking pin is used to prevent the fastening ring 23 from rotating. The hole elastic retaining ring is clamped in the slot of the outer tube 21, and the hole elastic retaining ring blocks the outer bearing of the deep groove ball bearing to prevent the system protection tube 29 from moving upward.

[0037] The system protection tube 29 and the valve body 222 rotate freely in the outer tube 21. The system protection tube 29 and the outer tube 21 form a rotating dynamic seal through two Che's mud special seals. A deep groove ball bearing is installed on the step surface of the lower end of the valve body 222 and fixed by a fixing ring. The venturi tube flow detector 231 uses a positive venturi tube structure to measure the mud flow that controls the torque of the positive straight screw drilling tool 1. The venturi tube flow detector 231 is inserted into the upper channel of the valve body 222, fixed on the valve body 222 by flat threads, and forms a static seal through eight O-rings.

[0038] The valve core 233 is inserted into the venturi tube flow detector 231 and can move freely under the drive of the transmission shaft 212. A guide key is processed on the upper end of the valve core 233 to move axially along the guide groove on the upper end of the venturi tube flow detector 231. The valve core 233 and the venturi tube flow detector 231 form a sliding dynamic seal through the Che C-shaped seal 218. The venturi tube flow detector 231 is circumferentially provided with six long groove-shaped radial communication valve holes 205. The amount of mud entering is regulated by adjusting the relative position of the valve core 233 and the radial communication valve hole 205.

[0039] The venturi tube flow detector 231 is circumferentially provided with four contraction section pressure taking holes 207 and four throat section pressure taking holes 2021. The lower end of the transmission shaft 212 is a trapezoidal transmission screw structure which forms a screw transmission mechanism with the valve core 233. The upper end of the transmission shaft 212 is connected to the output shaft of the motor reducer combination 245 through a coupling 242, and is fixed to the motor reducer output shaft fastening pin through a transmission shaft fastening pin. The motor reducer combination 245 is fixed to the system connection short circuit 211 through four motor reducer fastening hexagon socket screws.

[0040] The motor reducer assembly 245 is inserted into the motor reducer protection tube 246, and the lower end of the motor reducer protection tube 246 is connected to the system connection short circuit 211 through a flat thread, and a static seal is formed by two O-rings. The upper end of the motor reducer protection tube 246 is connected to the connection short circuit 248 through a flat thread, and a static seal is formed by two O-rings. The eight-core power sealing connector 249 is inserted into the connection short circuit 248 and connected through a flat thread, and a static seal is formed by two O-rings. The electronic needle at the lower end of the eight-core power sealing connector 249 is connected to the motor reducer assembly 245 through a soft cable, and the electronic needle at the upper end of the eight-core power sealing connector 249 is connected to the motor drive circuit 252 through a soft cable.

[0041] The motor drive circuit 252 is fixed to the motor drive circuit bracket 255 by four fastening screws, and the connecting wire short circuit 248, the motor drive circuit bracket 255 and the motor drive circuit protection tube 253 are connected by flat threads, and two O-rings are used to form a static sealing structure. The five-core power sealing connector 257 is inserted into the motor drive circuit bracket 255 and connected by flat threads, and a static seal is formed by two O-rings. The electronic needle at the lower end of the five-core power sealing connector 257 is connected to the motor drive circuit 252 through a soft cable, and the electronic needle at the upper end of the five-core power sealing connector 257 is connected to the outer electronic needle of the five-core power sealing connector on the No. 1 rectangular circuit board protection tube 6 through a soft cable.

[0042] The system connection short circuit 211, the motor reducer protection tube 246, the connection short circuit 248, the motor drive circuit protection tube 253, the motor drive circuit bracket 255 and each O-ring constitute a secondary sealing structure. The secondary sealing cavity of the motor reducer assembly 245 is filled with oil through the injection hole 2026 of the system connection short circuit 211, and the air is discharged through the exhaust hole 2027, which can effectively prevent the intrusion of water vapor. The injection hole NPT sealing plug 260 is installed on the oil filling hole of the system connection short circuit 211, and the exhaust hole NPT sealing plug 261 is installed on the exhaust hole of the system connection short circuit 211. The lower end of the system connection short circuit 211 is connected to the upper end of the connection buckle 214 through a flat thread, and a static seal is formed by two O-rings. Two Che's mud special seals are installed in the connection buckle 214 to form a rotating seal with the transmission shaft 212.

[0043] The shaft elastic ring is installed in the groove of the transmission shaft 212 to fix the deep groove ball bearing, and the sealing top ring 239 presses the special seal for Che's mud, and the transmission shaft 212 can rotate freely. The lower end of the connecting buckle 214 is connected to the upper end of the connecting thread 234 through a flat thread, and a static seal is formed through two O-rings. The lower end of the connecting thread 234 is connected to the upper end of the venturi tube flow detector 231 through a flat thread, and a static seal is formed through two O-rings.

[0044] The closing valve sleeve 230 and the closing base 224 are inserted into the center hole at the lower end of the valve body 222. The closing valve sleeve 230 and the valve body 222 form a dynamic seal through an O-ring. The lower end of the closing valve sleeve 230 is inserted into the closing base 224 and can slide freely. The reset spring 229 assists the closing valve sleeve 230 to restore the initial position. The hole uses an elastic retaining ring to position the closing base 224. The hollow titanium alloy flexible shaft 226 is connected to the valve body 222 through a flat thread and forms a static seal through two O-rings. The hollow titanium alloy flexible shaft 226 is connected to the transmission shaft 18 on the straight screw through a flat thread and forms a static seal through two O-rings. The No. 1 rectangular circuit board protection tube 6 and the No. 2 rectangular circuit board protection tube 7 are symmetrically installed on the central trustee 28 and are fixed to the central trustee 28 by fixing screws respectively.

[0045] Please continue to refer to Figures 4 to 10In some embodiments, the intelligent automatic control friction reduction and drag speed-up system 2 further includes: No. 1 connecting annular groove 206, contraction section pressure taking hole 207, No. 2 connecting annular groove 208, pore throat section pressure taking hole 2021, valve body pore throat radial pressure taking hole 2028, valve body contraction section radial pressure taking hole 2029, first pressure taking channel 2031, second pressure taking channel 2030 and flow detection mechanism, the flow detection mechanism includes: No. 1 pressure sensor 270, No. 2 pressure sensor 272 and Venturi tube flow detector 231; wherein, No. 1 pressure sensor 270 is sealed and fixed on the valve body 222 and is connected to the first pressure taking channel 2031, the first pressure taking channel 2031 is connected to the valve body pore throat radial pressure taking hole 2028, The No. 2 connecting annular groove 208 is connected to the pore throat section pressure taking hole 2021, the No. 1 pressure sensor 270 is used to measure the pore throat section pressure of the Venturi tube flow detector 231, and the other end of the No. 1 pressure sensor 270 is electrically connected to the No. 1 rectangular circuit board protection tube 6; the No. 2 pressure sensor 272 is sealed and fixed on the valve body 222 and is connected to the second pressure taking channel 2030, the second pressure taking channel 2030 is connected to the valve body contraction section radial pressure taking hole 2029, the No. 1 connecting annular groove 206 and the contraction section pressure taking hole 207, the No. 2 pressure sensor 272 is used to measure the contraction section pressure of the Venturi tube flow detector 231, and the other end of the No. 2 pressure sensor 272 is electrically connected to the No. 1 rectangular circuit board protection tube 6.

[0046] Please continue to refer to Figures 4 to 10 In some embodiments, the intelligent automatic control friction reduction and drag speed increase system 2 also includes a third pressure channel 2032, a valve body center through hole 209 and a downhole information monitoring mechanism, the downhole information monitoring mechanism includes a No. 3 pressure sensor 277, the No. 3 pressure sensor 277 is sealed and fixed on the valve body 222 and is connected to the third pressure channel 2032, the third pressure channel 2032 is connected to the valve body center through hole 209 of the valve body 222, the No. 3 pressure sensor 277 is used to measure the mud fluid pressure change in the valve body center through hole 209, and the other end of the No. 3 pressure sensor 277 is electrically connected to the No. 1 rectangular circuit board protection tube 6.

[0047] Please continue to refer to Figures 4 to 10 as well as Fig.12 In some embodiments, the intelligent automatic control friction reduction, drag reduction and speed-up system 2 also includes: a rectangular circuit board protection tube 6 No. 1, which includes a sealing plug, an intelligent automatic control friction reduction, drag reduction and speed-up system main control circuit 65, a rectangular circuit protection tube 66 No. 1, and a circuit board bracket 69 No. 1; wherein, the sealing plug 62 is fixedly and sealedly inserted into the upper end of the rectangular circuit protection tube 66 No. 1, the circuit board bracket 69 No. 1 is fixedly and sealedly inserted into the lower end of the rectangular circuit protection tube 66 No. 1, and the main control circuit 65 of the intelligent automatic control friction reduction, drag reduction and speed-up system is fixed on the circuit board bracket 69 No. 1.

[0048] Please continue to refer to Figures 4 to 10 as well as Fig.13 In some embodiments, the intelligent automatic control friction reduction and drag reduction speed-up system 2 also includes: a No. 2 rectangular circuit board protection tube 7, the No. 2 rectangular circuit board protection tube 7 includes a No. 2 circuit board bracket 72, a No. 2 rectangular circuit protection tube 76, a No. 2 power supply battery 77, a No. 2 wireless communication circuit 710, and a sealing plug; wherein, the No. 2 circuit board bracket 72 is sealedly inserted into the upper end of the No. 2 rectangular circuit protection tube 76, the sealing plug is sealedly inserted into the lower end of the No. 2 rectangular circuit protection tube 76, the No. 2 wireless communication circuit 710 and the No. 2 power supply battery 77 are fixed on the No. 2 circuit board bracket 72, and the No. 2 wireless communication circuit 710 is electrically connected to the No. 2 power supply battery 77.

[0049] Through the above settings, specifically:

[0050] The No. 1 pressure sensor 270 is fixed on the valve body 222 through a flat thread and is connected to the first pressure channel 2031, and a static seal is formed by two O-rings. The first pressure channel 2031 is connected to the valve body throat radial pressure hole 2028, the No. 2 connecting annular groove 208 and the throat section pressure hole 2021. The No. 1 pressure sensor 270 can measure the throat section pressure of the Venturi tube flow detector 231. The other end of the No. 1 pressure sensor 270 is connected to the five-core power sealing connector of the No. 1 rectangular circuit board protection tube 6 through a soft cable;

[0051] The No. 2 pressure sensor 272 is fixed on the valve body 222 through flat threads and is connected to the second pressure channel 2030, and is statically sealed through two O-rings. The second pressure channel 2030 is connected to the radial pressure hole 2029 of the contraction section of the valve body 222, the No. 1 connecting annular groove 206 and the contraction section pressure hole 207. The No. 2 pressure sensor 272 can measure the contraction section pressure of the venturi tube flow detector 231. The other end of the No. 2 pressure sensor 272 is connected to the five-core power sealing connector of the No. 1 rectangular circuit board protection tube 6 through a flexible cable;

[0052] The No. 3 pressure sensor 277 is fixed on the valve body 222 through flat threads and connected to the third pressure channel 2032, and static seals are formed through two O-rings. The third pressure channel 2032 is connected to the valve body center through hole 209 of the valve body 222. The No. 3 pressure sensor 277 can measure the mud fluid pressure change in the valve body center through hole 209. The other end of the No. 3 pressure sensor 277 is connected to the five-core power sealing connector of the No. 1 rectangular circuit board protection tube 6 through a soft cable;

[0053] The No. 1 mud filter screen plate 262 is installed in front of the valve body throat radial pressure taking hole 2028. The No. 1 hole uses a C-shaped elastic retaining ring 263 to fix the No. 1 mud filter screen plate 262 on the valve body 222. The No. 1 sealing plug 264 seals the installation hole and forms a static seal with the valve body 222 through an O-ring.

[0054] The No. 2 mud filter screen plate 266 is installed in front of the radial pressure-taking hole 2029 in the contraction section of the valve body. The No. 2 hole uses a C-shaped elastic retaining ring 267 to fix the No. 2 mud filter screen plate 266 on the valve body 222. The No. 2 sealing plug 268 seals the installation hole and forms a static seal with the valve body 222 through an O-ring.

[0055] Please continue to refer to Figures 4 to 10 In some embodiments, the intelligent automatic control friction reduction, drag reduction and speed-up system 2 includes a wireless communication mechanism, which includes: a wireless communication circuit, which is connected to the intelligent automatic control friction reduction, drag reduction and speed-up system main control circuit 65 through RS485 communication method, and transmits the tool face angle information measured by the tool face angle measurement system 3 to the intelligent automatic control friction reduction, drag reduction and speed-up system main control circuit 65 for processing in real time.

[0056] Through the above arrangement, specifically: four five-core electric sealing joints 61 are respectively installed in the sealing plug 62 and the circuit board bracket 69 through flat threads, and are respectively statically sealed by two O-rings. The electronic needles inside the four five-core electric sealing joints 61 are respectively connected to the main control circuit 65 of the intelligent automatic control friction reduction and drag reduction speed-up system through soft cables. The sealing plug 62 is inserted into the upper end of the rectangular circuit protection tube 66, fixed to the rectangular circuit protection tube 66 by two fixing screws, and statically sealed by two O-rings. The circuit board bracket 69 is inserted into the lower end of the rectangular circuit protection tube 66, fixed to the rectangular circuit protection tube 66 by two fixing screws, and statically sealed by two O-rings. The four main control circuits 65 of the intelligent automatic control friction reduction and drag reduction speed-up system are fixed to the circuit board bracket 69 by fastening nuts 64 and fastening screws 271.

[0057] Please refer to Fig.11In some embodiments, the tool face angle measurement system 3 includes: a protective tube 31, a fixed top ring 32, a sealing plug 33, a tool face angle measurement circuit 34, a wireless communication circuit 36, a power supply battery 38, a fixed top ring 39, a circuit board bracket 311, and a circuit board protective tube 312; wherein, the guide key of the circuit board protective tube 312 is inserted into the guide groove in the protective tube 31, and the upper and lower ends are respectively fixed by the fixed top rings (32, 39); the sealing plug 33 is inserted into and sealedly connected to the upper end of the circuit board protective tube 312, and the circuit board bracket 311 is inserted into and sealedly connected to the lower end of the circuit board protective tube 312; the tool face angle measurement circuit 34, the wireless communication circuit 36 ​​and the power supply battery 38 are fixed on the circuit board bracket 311, and the tool face angle measurement circuit 34, the wireless communication circuit 36 ​​and the power supply battery 38 are electrically connected.

[0058] Through the above settings, specifically: the wireless communication circuit 36 ​​is fixed to the circuit board bracket 311 by four fastening nuts and fastening screws, the power supply battery 38 is fixed to the circuit board bracket 311 by four fastening screws and fastening nuts, the wireless communication circuit 36 ​​and the power supply battery 38 are connected by a soft cable, the wireless communication circuit 36 ​​transmits the received measurement signal to the intelligent automatic control friction reduction, drag reduction and speed-up system main control circuit 65 through the soft cable, and the power supply battery 38 supplies power to the wireless communication circuit 36 ​​and the intelligent automatic control friction reduction, drag reduction and speed-up system main control circuit 65 respectively through the soft cable.

[0059] In combination with the above configuration, the specific working principle of the intelligent self-controlled friction reduction, drag reduction and speed-increasing composite screw drilling tool 100 according to the embodiment of the present invention is as follows:

[0060] When starting work, the upper end of the straight screw upper valve body 11 is connected to the upper drill string, the lower end of the single bent screw lower transmission shaft 510 is fixedly connected to the drill bit, the valve core 233 is in a fully closed state at the lower end, and the radial connecting valve hole 205 of the Venturi tube flow monitor is completely closed.

[0061] Before drilling begins, the ground mud pump issues a low pressure-high pressure-low pressure command cycle twice, and the No. 3 pressure sensor 277 measures two high and low pressure cycle commands and transmits the commands to the main control circuit 65 of the intelligent automatic control friction reduction, drag reduction and speed increase system. The main control circuit 65 of the intelligent automatic control friction reduction, drag reduction and speed increase system automatically issues a motor drive command to the motor drive circuit 252, and the motor drive circuit 252 energizes the motor reducer combination 245. The motor reducer combination 245 rotates through the coupling 242 to drive the transmission shaft 212 to rotate, and the transmission screw at the lower end of the transmission shaft 212 drives the valve core 233 to move upward to a fully open state, and the motor reducer combination 245 automatically stops rotating and cuts off the power.

[0062] Before drilling, the drilling fluid is first pumped into the upper drill string through the ground mud pump. The drilling fluid flows through the upper drill string into the upper valve body 11 and passes through the center of the valve sleeve 12. The drilling fluid flows into the central through hole 2025 of the central trustee and passes through the central through hole 209 of the valve body. The mud is divided into two parts:

[0063] A portion of the mud continues to flow downward along the center through hole 209 of the valve body, passes through the center hole 2019 of the closing valve sleeve, the spring chamber 2017 and the radial connecting hole 2010 of the closing base and the center hole 2011 of the closing base, enters the center channel 2014 of the hollow titanium alloy flexible shaft and the hollow forward screw channel 101, passes through the hollow forward screw radial channel 102 and enters the upper universal shaft annular channel 103, the upper short-circuit radial channel 104, and the upper transmission shaft channel 105, passes through the annular channel 301 and the center channel of the MWD measurement while drilling short circuit 4, and finally enters the lower motor assembly to drive the forward screw 55 to rotate forward. The lower universal shaft 56, the lower short-circuit 58, the lower transmission shaft 510 of the single-bend screw and the drill bit rotate in the forward direction, the drill bit starts to break the rock and drill, and transmits the reverse torque to the lower centralizer 59, the lower universal shaft cylinder 57, the lower motor assembly cylinder 54, the single-bend screw connecting short-circuit 53 and the single-bend screw lower valve body 51;

[0064] Another mud path passes through the radial communication channel 204 of the valve body and enters the radial communication valve hole 205 of the venturi tube flow monitor, flows through the expansion hole 2020 of the venturi tube flow detector and the eccentric channel 2016 of the valve body, and then enters the hollow titanium alloy flexible shaft annulus channel 2015 and the upper annulus channel 2013 of the forward screw, and enters the upper motor assembly. The hollow forward screw 14 is driven to rotate forward to generate a forward torque, which is transmitted to the upper universal shaft 16, the upper short circuit 17, the upper transmission shaft 18 of the straight screw and the protective cylinder 31, and the MWD measurement while drilling short circuit 4, thereby transmitting the forward torque to the lower valve body 51 of the single-bend screw, the single-bend screw connecting short circuit 53, the lower motor assembly cylinder 54, the lower universal shaft cylinder 57 and the lower centralizer 59.

[0065] At this time, the tubular string consisting of the forward screw 55, the lower universal shaft 56, the lower short circuit 58, the single-bend screw lower transmission shaft 510 and the drill bit rotates forward relative to the wellbore, transmitting the counter-torque of the tubular string consisting of the single-bend screw lower valve body 51, the single-bend screw connecting short circuit 53, the lower motor assembly cylinder 54, the lower universal shaft cylinder 57 and the lower centralizer 59, while the hollow forward screw 14 drives the upper universal shaft 16, the upper short circuit 17, the straight screw upper transmission shaft 18, the protective cylinder 31 and the MWD measurement while drilling short circuit 4 to rotate forward to generate a positive torque to overcome the counter-torque of the tubular string consisting of the single-bend screw lower valve body 51, the single-bend screw connecting short circuit 53, the lower motor assembly cylinder 54, the lower universal shaft cylinder 57 and the lower centralizer 59. Therefore, the hollow forward screw 14 drives the upper universal shaft 16, the upper short-circuit 17, the straight screw upper transmission shaft 18, the protective tube 31, the MWD measurement while drilling short-circuit 4 and the single-bend screw lower valve body 51, the single-bend screw connecting short-circuit 53, the lower motor assembly cylinder 54, the lower universal shaft cylinder 57 and the lower centralizer 59 to form a pipe string that is stationary relative to the wellbore to achieve directional drilling.

[0066] In the present application, the valve core 233 is driven by the motor reducer combination 245 to adjust its relative position with the radial connecting valve hole 205 of the venturi tube flow detector, so as to control the actual opening size of the radial connecting valve hole 205 of the venturi tube flow detector, thereby regulating the incoming mud displacement; by adjusting the mud displacement, the forward torque of the upper forward straight screw drilling tool 1 is regulated.

[0067] Furthermore, when the mud flows through the venturi tube flow detector 231, the No. 1 pressure sensor 270 measures the pressure of the venturi tube flow detector 231 through the first pressure channel 2031, the valve body throat radial pressure hole 2028, the No. 2 connecting annular groove 208 and the throat section pressure hole 2021. The No. 2 pressure sensor 272 measures the pressure of the contraction section of the venturi tube flow detector 231 through the second pressure channel 2030, the valve body contraction section radial pressure hole 2029, the No. 1 connecting annular groove 206 and the contraction section pressure hole 207. The main control circuit 65 of the intelligent automatic control friction reduction and speed increase system calculates the mud displacement when the radial connecting valve hole 205 of the venturi tube flow detector is currently opened according to the measured pressures of the No. 1 pressure sensor 270 and the No. 2 pressure sensor 272, that is, calculates the torque of the upper forward straight screw drilling tool 1 at the moment. The number of rotations of the motor reducer combination 245 can be measured by the Hall sensor of the motor reducer combination 245. In conjunction with the pitch of the transmission screw at the lower end of the transmission shaft 212, the main control circuit 65 of the intelligent automatic control friction reduction and speed increase system can calculate the current displacement of the valve core 233.

[0068] The intelligent self-controlled friction-reducing, drag-reducing and speed-increasing composite screw drilling tool 100 according to an embodiment of the present invention:

[0069] (1) Tool face stabilization process (i.e., directional drilling): The radial plane where the lower stabilizer 59 is located is the tool face. Since the lower stabilizer 59 is fixedly connected to the protective tube 31 through the lower universal shaft cylinder 57, the lower motor assembly cylinder 54, the single-bend screw connecting short circuit 53, the single-bend screw lower valve body 51, and the MWD measurement while drilling short circuit 4, the angle of the tool face of the lower stabilizer 59 can be measured in real time by the tool face angle measurement system 3 equipped with a high-temperature accelerometer.

[0070] Specifically, the tool face of the lower centralizer 59 is divided into 0 to -180 degrees on the left side and 0 to 180 degrees on the right side.

[0071] First, the main control circuit 65 of the intelligent automatic friction reduction and drag reduction speed-up system calculates the displacement M of the upper forward straight screw drilling tool 1 that can balance the counter-torque of the lower forward single-bend screw drilling tool 5 according to the total pumped mud displacement, and the main control circuit 65 of the intelligent automatic friction reduction and drag reduction speed-up system sends a command to the motor drive circuit 252, supplies power to the motor reducer assembly 245 to rotate it, and drives the transmission shaft 212 to rotate, thereby driving the valve core 233 to move axially. The No. 1 pressure sensor 270, the No. 2 pressure sensor 272 and the venturi tube flow detector 231 constitute a venturi tube flowmeter, and the No. 1 pressure sensor 270 and the No. 2 pressure sensor 272 measure the fluid pressure in real time. The main control circuit 65 of the intelligent automatic friction reduction and drag reduction speed-up system calculates the mud displacement through the upper forward straight screw drilling tool 1 in real time according to the pressure data monitored by the No. 1 pressure sensor 270 and the No. 2 pressure sensor 272. When the actual value of the mud displacement through the upper forward straight screw drilling tool 1 reaches the displacement M that balances the counter-torque of the lower forward single-bend screw drilling tool 5, the main control circuit 65 of the intelligent automatic control friction reduction and drag reduction speed-up system sends a shutdown command to the motor drive circuit 252, and the motor drive circuit 252 cuts off the power to the motor reducer assembly 245, the motor reducer assembly 245 stops rotating, and the valve core 233 stops axial movement. At this time, the pipe string composed of the hollow forward screw 14, the upper universal shaft 16, the upper short circuit 17, the straight screw upper transmission shaft 18, the protective cylinder 31, the MWD measurement while drilling short circuit 4, the single-bend screw lower valve body 51, the single-bend screw connecting short circuit 53, the lower motor assembly cylinder 54, the lower universal shaft cylinder 57 and the lower centralizer 59 is stationary relative to the wellbore, and the tool face of the centralizer is at any position at this time.

[0072] Secondly, when the tool face of the centralizer is at any angle of 0 to -180° on the left side, the main control circuit 65 of the intelligent automatic friction reduction and drag reduction speed-up system recalculates the displacement N of the torque of the upper forward straight screw drilling tool 1 being greater than the counter-torque of the lower forward single-bend screw drilling tool 5, and the main control circuit 65 of the intelligent automatic friction reduction and drag reduction speed-up system sends a command to the motor drive circuit 252 to supply power to the motor reducer assembly 245 to rotate it, driving the transmission shaft 212 to rotate, thereby driving the valve core 233 to move axially to adjust the mud displacement of the upper forward straight screw drilling tool 1. When the actual value of the mud displacement through the upper forward straight screw drilling tool 1 reaches the displacement N, the main control circuit 65 of the intelligent automatic friction reduction and drag reduction speed-up system sends a stop command to the motor drive circuit 252, and the valve core 233 stops moving axially. At this time, the pipe string consisting of the hollow forward screw 14, the upper universal shaft 16, the upper short circuit 17, the upper transmission shaft 18 of the straight screw, the protective tube 31, the MWD measurement while drilling short circuit 4, the lower valve body 51 of the single-bend screw, the single-bend screw connecting short circuit 53, the lower motor assembly cylinder 54, the lower universal shaft cylinder 57 and the lower centralizer 59 rotates forward. When the tool face angle measurement system 3 measures that the tool face of the centralizer rotates to 0°, the tool face angle measurement circuit 34 sends the measured tool face angle signal to the wireless communication circuit 710 through the wireless communication circuit 36, and the wireless communication circuit 710 then transmits the signal to the intelligent automatic control friction reduction and drag reduction speed-up system main control circuit 65, and the intelligent automatic control friction reduction and drag reduction speed-up system main control circuit 65 sends the motor drive circuit 252 an instruction for the valve core 233 to adjust the displacement M, and the valve core 233 moves axially to the position of the displacement M. At this time, the tubing string consisting of the hollow forward screw 14, the upper universal joint 16, the upper short-circuit 17, the straight screw upper transmission shaft 18, the protective tube 31, the MWD measurement while drilling short-circuit 4, the single-bend screw lower valve body 51, the single-bend screw connecting short-circuit 53, the lower motor assembly cylinder 54, the lower universal joint cylinder 57 and the lower centralizer 59 stops rotating and is stationary and stable relative to the wellbore.

[0073] Finally, when the tool face of the centralizer 59 is at any angle of 0 to 180° on the right side, the main control circuit 65 of the intelligent automatic friction reduction and drag reduction speed-up system recalculates the displacement P of the torque of the upper forward straight screw drilling tool 1 less than the counter-torque of the lower forward single-bend screw drilling tool 5, and the main control circuit 65 of the intelligent automatic friction reduction and drag reduction speed-up system sends a command to the motor drive circuit 252 to supply power to the motor reducer assembly 245 to rotate it, driving the transmission shaft 212 to rotate, thereby driving the valve core 233 to move axially to adjust the mud displacement of the upper forward straight screw drilling tool 1. When the actual value of the mud displacement through the upper forward straight screw drilling tool 1 reaches the displacement P, the main control circuit 65 of the intelligent automatic friction reduction and drag reduction speed-up system sends a stop command to the motor drive circuit 252, and the valve core 233 stops moving axially. At this time, the pipe string consisting of the hollow forward screw 14, the upper universal shaft 16, the upper short circuit 17, the upper transmission shaft 18 of the straight screw, the protective tube 31, the MWD measurement while drilling short circuit 4, the lower valve body 51 of the single-bend screw, the single-bend screw connecting short circuit 53, the lower motor assembly cylinder 54, the lower universal shaft cylinder 57 and the lower centralizer 59 rotates in the opposite direction. When the tool face angle measurement system 3 measures that the tool face of the centralizer rotates to 0°, the tool face angle measurement circuit 34 sends the measured tool face angle signal to the wireless communication circuit 710 through the wireless communication circuit 36, and the wireless communication circuit 710 then transmits the signal to the intelligent automatic control friction reduction, drag reduction and speed-up system main control circuit 65, and the intelligent automatic control friction reduction, drag reduction and speed-up system main control circuit 65 sends the motor drive circuit 252 an instruction for adjusting the valve core 233 to the displacement M, and the valve core 233 moves axially to the position of the displacement M. At this time, the pipe string consisting of the hollow forward screw 14, the upper universal shaft 16, the upper short-circuit 17, the straight screw upper transmission shaft 18, the protective tube 31, the MWD measurement while drilling short-circuit 4, the single-bend screw lower valve body 51, the single-bend screw connecting short-circuit 53, the lower motor assembly cylinder 54, the lower universal shaft cylinder 57 and the lower centralizer 59 stops rotating and is stationary and stable relative to the wellbore. At this time, the tool face completes the 0° stable adjustment process.

[0074] (2) Wellbore trajectory control process (adjusting tool face angle):

[0075] First, set the tool face basic adjustment angle unit to 0° and the tool face rotation displacement to N. The ground mud pump issues a low pressure-high pressure-low pressure instruction cycle three times, and the No. 3 pressure sensor 277 measures three high and low pressure cycle instructions and transmits the instructions to the main control circuit 65 of the intelligent automatic control friction reduction and drag reduction and speed-up system. The main control circuit 65 of the intelligent automatic control friction reduction and drag reduction and speed-up system automatically issues a motor drive instruction to the motor drive circuit 252, and the motor drive circuit 252 energizes the motor reducer combination 245, thereby driving the valve core 233 to move axially to adjust the mud displacement from M to the mud displacement N. The valve core 233 moves axially to the displacement N position, and the hollow forward screw 14, the upper universal shaft 16, the upper short circuit 17, the straight screw upper transmission shaft 18, the protective cylinder 31, the MWD measurement while drilling short circuit 4 and the single-bend screw lower valve body 51, the single-bend screw connecting short circuit 53, the lower motor assembly cylinder 54, the lower universal shaft cylinder 57 and the lower centralizer 59 The string composed of the lower centralizer 59 rotates forward.

[0076] Secondly, when the tool face angle measurement system 3 measures that the tool face of the centralizer 59 turns to 0°, the tool face angle measurement circuit 34 sends the measured tool face angle signal to the wireless communication circuit 710 through the wireless communication circuit 36, and the wireless communication circuit 710 then transmits the signal to the intelligent automatic control friction reduction and drag reduction speed-up system main control circuit 65, and the intelligent automatic control friction reduction and drag reduction speed-up system main control circuit 65 sends a command to the motor drive circuit 252 to adjust the valve core 233 to the displacement M, and the valve core 233 moves axially to the position of displacement M. At this time, the pipe string composed of the hollow forward screw 14, the upper universal shaft 16, the upper short circuit 17, the straight screw upper transmission shaft 18, the protective cylinder 31, the MWD measurement while drilling short circuit 4, the single-bend screw lower valve body 51, the single-bend screw connecting short circuit 53, the lower motor assembly cylinder 54, the lower universal shaft cylinder 57 and the lower centralizer 59 stops rotating and is stationary and stable at 0° relative to the wellbore. At this time, the tool face completes the 0° stable adjustment process.

[0077] When the tool face needs to be adjusted to R°, the intelligent self-control friction reduction and drag reduction speed-up system main control circuit 65 calculates that it needs to be adjusted S times. Therefore, it is necessary to issue S low-pressure-high-pressure-low-pressure three-cycle instructions on the ground, and measure whether the tool face has turned to the predetermined angle R° through the MWD while drilling measurement short circuit 4. If the tool face has not turned to the predetermined angle, it can continue to be adjusted until it reaches the predetermined angle.

[0078] (3) Composite drilling process:

[0079] When directional drilling is completed and composite drilling is required for inclination stabilization, the maximum mud displacement Q (Q>M, Q>P, Q>N) is pumped into the ground, and the automatic closing valve sleeve 230 moves down and inserts into the closing base 224, closing the closing valve sleeve radial connecting hole 2018, so that all the mud passes through the upper forward straight screw drilling tool 1. When the intelligent automatic control friction reduction and drag reduction speed-up system main control circuit 65 calculates the mud displacement through the upper forward straight screw drilling tool 1 to be Q in real time based on the pressure data monitored by the No. 1 pressure sensor 270 and the No. 2 pressure sensor 272, the intelligent automatic control friction reduction and drag reduction speed-up system main control circuit 65 sends a full-open instruction to the motor drive circuit 252, and the motor reducer assembly 245 rotates to drive the valve core 233 to move in the full-open direction, and automatically stops when it reaches the position. At this time, the hollow forward screw 14 rotates at the fastest speed, driving the pipe string composed of the upper universal shaft 16, the upper short-circuit 17, the straight screw upper transmission shaft 18, the protection tube 31, the MWD measurement while drilling short-circuit 4 and the lower valve body 51, the single-bend screw connecting short-circuit 53, the lower motor assembly cylinder 54, the lower universal shaft cylinder 57 and the lower centralizer 59 to rotate rapidly, forming a composite rotation with the rotation of the transmission shaft 510 and the connected drill bit, further increasing the composite rotation speed.

[0080] When the composite drilling is completed, the mud displacement pumped into the ground is reduced. When the mud displacement is lower than Q, the closing valve sleeve 230 moves to the initial position under the action of the return spring force of the return spring 229, and the radial connecting hole 2018 of the closing valve sleeve is opened again. At the same time, the intelligent automatic control friction reduction and drag reduction speed-up system 2 automatically enters the tool face 0° balance control process.

[0081] In summary, the intelligent self-control friction reduction, drag reduction and speed-up composite screw drill 100 according to the embodiment of the present invention is based on the forward straight screw drill 1 and the forward single-bend screw drill 5, and an intelligent self-control friction reduction, drag reduction and speed-up system 2 is added. When directional sliding drilling is performed, the intelligent self-control friction reduction, drag reduction and speed-up system 2 controls the torque of the forward straight screw drill 1 to adjust the counter-torque of the forward single-bend screw drill 5, thereby effectively controlling the angle of rotation of the tool face to achieve controllable wellbore trajectory, and the upper drill string can rotate forward to smoothly transmit drilling pressure, effectively solving the problems of supporting pressure and low mechanical drilling speed generated by conventional screw drills during sliding drilling. When composite drilling is performed, the forward straight screw drill 1 accelerates the rotation of the single-bend screw drill to further increase the drilling speed.

[0082] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0083] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0084] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An intelligent self-controlled composite screw drill with reduced friction, reduced drag and increased speed, characterized in that: include: Forward straight screw drilling tool, intelligent self-controlled friction reduction and drag speed-up system, tool face angle measurement system, MWD measurement while drilling short circuit, forward single-bend screw drilling tool, the forward straight screw drilling tool includes an upper valve body, an upper motor assembly cylinder, an upper universal shaft cylinder, an upper transmission shaft, and an upper centralizer, and the forward single-bend screw drilling tool includes a lower valve body; Among them, the lower end of the straight screw upper valve body is connected to the upper end of the intelligent self-controlled friction reduction, drag reduction and speed-up system, the lower end of the intelligent self-controlled friction reduction, drag reduction and speed-up system is connected to the upper end of the upper motor assembly cylinder of the forward straight screw drilling tool, the lower end of the upper motor assembly cylinder is connected to the upper end of the upper universal shaft cylinder, the lower end of the upper universal shaft cylinder is connected to the upper end of the upper stabilizer, the upper end of the upper transmission shaft can rotate freely in the upper stabilizer, the lower end of the upper transmission shaft is connected to the upper end of the tool face angle measurement system, the lower end of the tool face angle measurement system is connected to the upper end of the MWD while drilling measurement system, the lower end of the MWD while drilling measurement system is connected to the upper end of the single-bend screw lower valve body through a tapered thread, and the forward straight screw drilling tool A hollow forward screw is used, and the intelligent self-controlled friction reduction, drag reduction and speed-up system is used to automatically adjust the mud displacement flowing into the forward straight screw drill tool and the forward single-bend screw drill tool, so as to adjust the forward torque of the forward straight screw drill tool and the reverse torque of the forward single-bend screw drill tool; the tool face angle measurement system is used to measure the angle of the tool face in real time, and wirelessly transmit the measured signal to the intelligent self-controlled friction reduction, drag reduction and speed-up system, and the intelligent self-controlled friction reduction, drag reduction and speed-up system automatically adjusts the distribution of mud displacement according to the received signal, so as to automatically achieve the balance of the tool face; the ground pressure control command cooperates with the tool face angle measurement system and the MWD downhole measurement to short-circuit and adjust the tool face angle, so as to achieve the regulation of the wellbore trajectory.

2. The intelligent self-controlled friction-reducing, drag-reducing and speed-increasing composite screw drilling tool according to claim 1 is characterized in that: The forward straight screw drilling tool also includes: Valve sleeve, hollow forward screw, upper universal shaft, upper short-circuit, hollow forward screw channel, hollow forward screw radial channel, upper universal shaft annular channel, upper short-circuit radial channel, upper transmission shaft channel; The upper end of the straight screw upper valve body is used to be connected with the upper drill string, so that the straight screw upper valve body can rotate forwardly along with the upper drill string.

3. The intelligent self-controlled friction-reducing, drag-reducing and speed-increasing composite screw drilling tool according to claim 2 is characterized in that: The forward single-bend screw drilling tool also includes: Valve sleeve, connecting short circuit, lower motor assembly cylinder, forward screw, lower universal shaft, lower universal shaft cylinder, lower short circuit, lower centralizer, lower transmission shaft, upper annular passage of forward screw, annular passage of lower universal shaft, radial passage of lower short circuit, and lower transmission shaft passage; Wherein, the lower end of the lower valve body is connected to the upper end of the connecting short circuit, the lower end of the connecting short circuit is connected to the upper end of the lower motor assembly cylinder, the lower end of the lower motor assembly cylinder is connected to the upper end of the lower universal shaft cylinder, the lower end of the lower universal shaft cylinder is connected to the upper end of the lower centralizer, the upper transmission shaft rotates together with the tool face angle measurement system, the MWD while drilling measurement system, the lower valve body, the connecting short circuit, the lower motor assembly cylinder, the lower universal shaft cylinder, and the lower centralizer, and the rotation of the lower centralizer constitutes the rotation of the tool face of the forward single-bend screw drilling tool.

4. The intelligent self-controlled friction-reducing, drag-reducing and speed-increasing composite screw drilling tool according to claim 3 is characterized in that: The intelligent automatic control friction reduction and drag reduction speed-increasing system comprises: Outer cylinder, lower connecting short circuit, fastening ring, center tube, protective cylinder, connecting short circuit, transmission shaft, connecting buckle, valve body, closing base, hollow titanium alloy flexible shaft, reset spring, closing valve sleeve, venturi tube flow detector, valve core, connecting pair wire, sealing top ring, motor reducer combination, motor reducer protective cylinder, connecting pair wire short circuit, motor drive circuit, motor drive circuit protective cylinder, motor drive circuit bracket; Wherein, the upper end of the valve body is statically sealed with the lower end of the center tube, the upper end of the valve body is seal-inserted and fixed to the lower end of the protective tube, the upper end of the center tube is statically sealed with the upper end of the protective tube, a deep groove ball bearing is sleeved on the upper end step surface of the protective tube, the fastening ring is used to fix the deep groove ball bearing on the upper end step surface of the protective tube and is fixed with a locking pin; the protective tube and the outer tube form a rotating dynamic seal; the Venturi tube flow detector is fixedly and seal-inserted into the channel on the valve body; the valve core is inserted into the Venturi tube flow detector and moves freely under the drive of the transmission shaft, the valve core and the Venturi tube flow detector form a sliding dynamic seal, and the Venturi tube flow detector is circumferentially provided with a radially connected valve hole, four contraction section pressure taking holes and a throat section pressure taking hole; the lower end of the transmission shaft and the valve core form a screw transmission mechanism, and the upper end of the transmission shaft is fixedly connected to the motor reducer combination; the The motor reducer assembly is fixed on the connecting short circuit and inserted into the motor reducer protection cylinder, the lower end of the motor reducer protection cylinder is sealed with the connecting short circuit, and the upper end of the motor reducer protection cylinder is sealed with the connecting short circuit; the motor drive circuit is fixed on the motor drive circuit bracket, the connecting short circuit, the motor drive circuit bracket and the motor drive circuit protection cylinder are sealed; the lower end of the connecting short circuit is sealed with the upper end of the connecting buckle, and the connecting buckle and the transmission shaft form a rotating seal; the lower end of the connecting buckle is sealed with the upper end of the connecting wire, and the lower end of the connecting wire is sealed with the upper end of the Venturi tube flow sensor, the closing valve sleeve and the closing base are sealed and inserted into the center hole of the lower end of the valve body, and the lower end of the closing valve sleeve is inserted into the closing base and can slide freely; the hollow titanium alloy flexible shaft is sealed with the valve body, and the hollow titanium alloy flexible shaft is sealed with the upper transmission shaft.

5. The intelligent self-controlled friction-reducing, drag-reducing and speed-increasing composite screw drilling tool according to claim 4 is characterized in that: The intelligent automatic control friction reduction and drag reduction speed-increasing system also includes: No. 1 connecting annular groove, contraction section pressure hole, No. 2 connecting annular groove, pore throat section pressure hole, valve body pore throat radial pressure hole, valve body contraction section radial pressure hole, first pressure channel, second pressure channel and flow detection mechanism, the flow detection mechanism includes: No. 1 pressure sensor, No. 2 pressure sensor and venturi tube flow detector; Among them, the No. 1 pressure sensor is sealed and fixed on the valve body and is connected with the first pressure channel, the first pressure channel is connected with the valve body pore throat radial pressure hole, the No. 2 connecting annular groove and the pore throat section pressure hole, the No. 1 pressure sensor is used to measure the pore throat section pressure of the Venturi tube flow detector, and the other end of the No. 1 pressure sensor is electrically connected to the No. 1 rectangular circuit board protection tube; the No. 2 pressure sensor is sealed and fixed on the valve body and is connected with the second pressure channel, the second pressure channel is connected with the valve body contraction section radial pressure hole, the No. 1 connecting annular groove and the contraction section pressure hole, the No. 2 pressure sensor is used to measure the contraction section pressure of the Venturi tube flow detector, and the other end of the No. 2 pressure sensor is electrically connected to the No. 1 rectangular circuit board protection tube.

6. The intelligent self-controlled friction-reducing, drag-reducing and speed-increasing composite screw drilling tool according to claim 5 is characterized in that: The intelligent self-controlled friction reduction, drag reduction and speed increase system also includes a third pressure channel, a valve body center hole and a downhole information monitoring mechanism. The downhole information monitoring mechanism includes a No. 3 pressure sensor. The No. 3 pressure sensor is sealed and fixed on the valve body and is connected to the third pressure channel. The third pressure channel is connected to the valve body center hole of the valve body. The No. 3 pressure sensor is used to measure the mud fluid pressure change in the valve body center hole. The other end of the No. 3 pressure sensor is electrically connected to the No. 1 rectangular circuit board protection tube.

7. The intelligent self-controlled friction-reducing, drag-reducing and speed-increasing composite screw drilling tool according to claim 6 is characterized in that: The intelligent automatic control friction reduction and drag reduction speed-increasing system also includes: No. 1 rectangular circuit board protection tube, the No. 1 rectangular circuit board protection tube comprising a sealing plug, a main control circuit of an intelligent automatic friction reduction and drag reduction speed-increasing system, a rectangular circuit protection tube, and a circuit board bracket; Among them, the sealing plug is fixed and sealed inserted into the upper end of the rectangular circuit protection tube, the circuit board bracket is fixed and sealed inserted into the lower end of the rectangular circuit protection tube, and the main control circuit of the intelligent automatic control friction reduction, drag reduction and speed increase system is fixed on the circuit board bracket.

8. The intelligent self-controlled friction-reducing, drag-reducing and speed-increasing composite screw drilling tool according to claim 7 is characterized in that: The intelligent automatic control friction reduction and drag reduction speed-increasing system also includes: No. 2 rectangular circuit board protection tube, the No. 2 rectangular circuit board protection tube comprising a circuit board bracket, a rectangular circuit protection tube, a power supply battery, a wireless communication circuit, and a sealing plug; The circuit board bracket is sealed and inserted into the upper end of the rectangular circuit protection tube, the sealing plug is sealed and inserted into the lower end of the rectangular circuit protection tube, the wireless communication circuit and the power supply battery are fixed on the circuit board bracket, and the wireless communication circuit is electrically connected to the power supply battery.

9. The intelligent self-controlled friction-reducing, drag-reducing and speed-increasing composite screw drilling tool according to claim 8 is characterized in that: The intelligent automatic control friction reduction, drag reduction and speed-up system includes a wireless communication mechanism, which includes: a wireless communication circuit, which is connected to the main control circuit of the intelligent automatic control friction reduction, drag reduction and speed-up system through RS485 communication method, and transmits the tool face angle information measured by the tool face angle measurement system to the main control circuit of the intelligent automatic control friction reduction, drag reduction and speed-up system for processing in real time.

10. The intelligent self-controlled friction-reducing, drag-reducing and speed-increasing composite screw drilling tool according to claim 9 is characterized in that: The tool face angle measurement system comprises: Protective tube, fixed top ring, sealing plug, tool face angle measurement circuit, wireless communication circuit, power supply battery, fixed top ring, circuit board bracket, circuit board protective tube; Among them, the guide key of the circuit board protection tube is inserted into the guide groove in the protection tube, and the upper and lower ends are fixed by fixed top rings respectively; the sealing plug is inserted into and sealedly connected to the upper end of the circuit board protection tube, and the circuit board bracket is inserted into and sealedly connected to the lower end of the circuit board protection tube; the tool face angle measurement circuit, wireless communication circuit and power supply battery are fixed on the circuit board bracket, and the tool face angle measurement circuit, wireless communication circuit and power supply battery are electrically connected.

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