Drilling tool stabilizer capable of adaptively adjusting rotational flow angle of centralizing strip

Abstract

The invention discloses a drilling tool stabilizer with a centralizing strip rotational flow angle self-adaptive adjustment function. The lower portion of the upper connector assembly is connected with the upper end face of the cavity upper end cover through a vibration energy absorption device. The lower end flange part of the stabilizer upper sleeve cover is connected with the cavity upper end cover through a screw; the cavity upper end cover is fixed to the upper end face of the stabilizer cavity side wall. The plurality of centralizing strip driving systems are circumferentially and uniformly arranged in a cylindrical space defined by the cavity upper end cover and the stabilizer cavity; the centralizing strips arranged on the outer side of the stabilizer cavity are fixed to the centralizing strip rotating shafts in the corresponding centralizing strip driving systems, and a middle connector of the flow divider communicates with a middle connector of the junction station through a middle pipeline. In the non-working state, the centralizing strips are in the vertical state, it can be guaranteed that the drilling tool stabilizer is put down smoothly, and friction resistance between the drilling tool stabilizer and the well wall is reduced; in the working state, high-pressure drilling fluid in the drilling process is directly used as a power source for deflection of the centralizing strips, and the rotational flow angles of the centralizing strips are optimized and controlled.

Description

Technical Field

[0001] The invention belongs to the technical field of drilling equipment for soil layers or rocks, and specifically relates to a drill string stabilizer that integrates self-adaptive adjustment of the swirl angle of a centralizer strip and energy harvesting and vibration damping. Background Art

[0002] Oil and gas resources are important resources for the development of modern industry and are crucial for a country's energy strategic security. Oil and gas resources are buried deep underground, and the geological conditions of different burial sites of oil and gas resources vary greatly. Therefore, it is necessary to specifically study safe drilling technologies under different geological conditions. Among them, the transportation of drill cuttings and the efficiency of borehole cleaning are one of the key points of safe drilling technology. Effective cuttings transportation means better borehole cleaning during drilling operations, which can improve the drilling speed, avoid sticking of the drill string, and problems such as higher drag force and torque. A drill string stabilizer (also called a centralizer) is a drill string joint installed at the top of the drill bit and is used in conjunction with a drill collar. It ensures that the drill string rotates along the well axis or approximately along the axis to achieve the control of the wellbore trajectory of a directional well and the deviation control of a vertical well. Stabilizers can be divided into two types according to the shape of the blades: spiral blades and straight blades. The spiral blade stabilizer has a larger surface area to ensure sufficient contact with the wellbore, making it easier to generate eddy currents and enhancing the cuttings transportation efficiency to a certain extent, especially in high-angle and horizontal wells. On the contrary, the surface area of the straight blade stabilizer is smaller than that of the spiral blade. Its advantage is to reduce drill string sticking and lower the frictional resistance. For spiral blades, increasing the swirl angle of the centralizer (i.e., the angle between the guide vane and the axis of the centralizer) can improve the cuttings carrying effect, but the flow resistance is large, which may increase the pump pressure and raise the well control risk; a lower swirl angle can reduce the flow resistance, but the swirl effect is weak. It can be seen that for different well conditions (such as well inclination and well diameter) and drilling fluid properties, selecting an appropriate swirl angle plays an important role in effective cuttings transportation.

[0003] During the process of oil, gas, and geological exploration, the frequent bit bounce and up-and-down vibration of the drill string and the drill bit will cause the drill pipe to lose its pure tensile working state and fall into a state of alternating tensile and compressive stresses, which will cause the drill pipe to break or reduce its service life and is one of the main reasons for the damage of the drill string and the drill bit. Nowadays, damping shock absorbers have been widely used in the shock absorption systems of vehicles. As an emerging shock absorption technology, particle damping shock absorption has the characteristics of simple structure, low cost, and wide shock absorption frequency band, and has certain applications in the fields of aerospace, civil engineering, machinery, etc. Based on the principles of the above shock absorption technologies, a shock absorption system was designed on the basis of the existing functions of traditional drill string stabilizers, improving the stability during the drilling process. At the same time, based on the piezoelectric effect and electromagnetic induction principles, a vibration energy absorption and conversion system was designed for the entire tool, improving the energy utilization efficiency. Summary of the Invention

[0004] In view of the problems existing in the background technology, the present invention provides a drill stabilizer with self-adaptive adjustment of the swirl angle of the centralizing strip. The technical solution includes: an upper sub assembly, an upper stabilizer cover, an upper end cover of the cavity, a stabilizer cavity, a plurality of centralizing strips, a vibration energy absorption device, a lower sub assembly, a diverter, a plurality of centralizing strip drive systems, a middle flow pipe and a collector. The outer periphery of the upper sub assembly is in spline profile fit with the diverter. At the same time, the protruding part on the outer side of the lower part of the upper sub assembly is connected to the upper end of the piston of the damping hydraulic cylinder of the vibration energy absorption device by screws. The bottom of the vibration energy absorption device is connected to the upper end face of the upper end cover of the cavity by screws; The lower flange part of the upper stabilizer cover is connected to the upper end cover of the cavity by screws; The upper end cover of the cavity is fixed to the upper end face of the side wall of the stabilizer cavity by bolts; A plurality of centralizing strip drive systems are circumferentially and uniformly arranged in the cylindrical space enclosed by the upper end cover of the cavity and the stabilizer cavity; The centralizing strip arranged on the outer side of the stabilizer cavity is fixed to the centralizing strip rotating shaft in the corresponding centralizing strip drive system, so that the centralizing strip rotates around the centralizing strip rotating shaft driven by the centralizing strip drive system; The middle interface of the diverter is hermetically fixed to the middle pipe, and the lower end of the middle flow pipe is hermetically fixed and connected to the middle interface of the collector; The lower sub assembly is connected to the cavity by threads;

[0005] The centralizing strip drive system includes: an inlet solenoid valve, a roller bearing, a centralizing strip rotating shaft, a thrust ball bearing, a gear, a rack, a plunger, a plunger return spring, a drive hydraulic cylinder, a check valve, a hydraulic cylinder support column, a pipe support, an outlet solenoid valve, a steering elbow and a tee. Among them, the diversion interface of the diverter, the inlet of the inlet solenoid valve, the outlet of the inlet solenoid valve, the first steering elbow, the inlet of the check valve, the outlet of the check valve, the first interface of the tee, the second interface of the tee and the hydraulic inlet of the drive hydraulic cylinder are hermetically fixed in sequence. Among them, the axes of the first interface and the second interface of the tee are collinear; The third interface of the tee, the second steering elbow, the outlet solenoid valve, the third steering elbow and the branch interface of the collector are hermetically fixed in sequence; The number of the diversion interfaces of the diverter and the branch interfaces of the collector matches the number of the centralizing strip drive systems, and they are circumferentially and uniformly arranged respectively;

[0006] The upper and lower ends of the hydraulic cylinder support column are respectively fixed to the drive hydraulic cylinder and the bottom of the barrel of the stabilizer cavity. There is a plunger and a plunger return spring in the drive hydraulic cylinder. The plunger is pushed up by the pressure from the hydraulic inlet. After the pressure is lost, the plunger drops due to the action of the plunger return spring; The end of the plunger is machined with threads and is threadedly connected to the rack, so that the rack can move with the plunger; The rack cooperates with the gear on one side; The gear is fixedly installed on the shaft; The inner end of the centralizing strip rotating shaft is installed in the four-hole central shaft sleeve through a roller bearing. The four-hole central shaft sleeve is sleeved and fixed on the outer side of the lower end of the diverter; The outer side of the centralizing strip rotating shaft is installed on the stabilizer cavity through a roller bearing.

[0007] The sealing and fixing method is: fixing by sealant and coupling.

[0008] A thrust ball bearing is additionally arranged between the outer side of the centralizer shaft and the stabilizer cavity, which is more conducive to the rotation of the centralizer. This structure can use the high-pressure drilling fluid during the working process as the power source for driving the centralizer. By simply controlling the opening and closing degree of the solenoid valve, the deflection angle and deflection speed of the centralizer can be controlled.

[0009] The axis of the centralizer shaft is aligned with the axis of the middle flow pipe, and at the same time, the center of gravity of the centralizer is also on the extension line of the axis of the centralizer shaft.

[0010] The drain solenoid valve and the inlet solenoid valve are both connected to the circuit board in the corresponding swirl angle automatic optimization control system;

[0011] The swirl angle automatic optimization control system includes: a liquid flow and component sensor, a torsion deflection angle sensor, a controller, and a circuit board. The liquid flow and component sensor is installed in the lower flange part of the upper cover of the stabilizer to monitor the flow rate, flow velocity, and density of the downhole drilling fluid, and further monitor the swirl state of the downhole drilling fluid and the cuttings transportation efficiency; the torsion deflection angle sensor is installed in the opening in the upper part of the centralizer to detect the swirl angle of the centralizer; then the signal is transmitted to the corresponding circuit board and controller; the circuit board and controller are installed on the upper end cover of the cavity, and each centralizer drive system is connected to and corresponds to a circuit board and controller.

[0012] When the deflection angle of the centralizer needs to be increased, the corresponding circuit board and controller control the corresponding inlet solenoid valve to open and the drain solenoid valve to close. The drilling fluid enters the hydraulic-gear rack drive device through the diverter and finally enters the drive hydraulic cylinder. The plunger pushes the rack to rise, and the rack makes the meshing gear rotate, so that the centralizer shaft rotates, and finally drives the deflection angle of the centralizer to increase; when the deflection angle needs to be decreased, the inlet solenoid valve is closed and the drain solenoid valve is opened. Due to the existence of the check valve, the drilling fluid in the drive hydraulic cylinder enters the manifold through the drain solenoid valve, and the plunger return spring makes the plunger descend, finally driving the deflection angle of the centralizer to decrease.

[0013] The vibration energy absorption device includes: a particle damping box cover, particle damping, a particle damping box, a vibration damping hydraulic cylinder piston, a vibration damping return spring, a vibration damping hydraulic cylinder, and a hydraulic buffer bottom valve. After the vibration damping hydraulic cylinder piston is sleeved into the vibration damping return spring, it is placed into the vibration damping hydraulic cylinder. The vibration damping hydraulic cylinder has hydraulic oil. In the compression stage, the piston rod moves downward, and most of the oil in the lower cavity of the inner cylinder flows into the liquid storage cavity through the hydraulic buffer bottom valve, generating compression damping; the particle damping is placed in the cavity formed by the particle damping box and the particle damping box cover, and the particle damping box is welded to the collar of the upper joint assembly.

[0014] A plurality of piezoelectric-electromagnetic composite vibration energy harvesting devices are installed inside the stabilizer cavity;

[0015] The piezoelectric-electromagnetic composite vibration energy harvesting device includes: a storage battery, an electromagnetic coil, a magnetic sphere, a sector ring thin wall, a soft spring, a piezoelectric sheet and a base. The base is fixed to the bottom of the barrel of the stabilizer cavity. Four sector ring thin walls and a soft spring are fixed on the base. The central angle enclosed by each sector ring thin wall is 90°. Four concentric sector ring thin walls enclose a thin wall cylindrical structure. A piezoelectric sheet is installed on the outer side of each thin wall cylinder; A magnetic sphere is fixed to the upper end of the soft spring by welding. In the natural state, the magnetic sphere is located at the exact center of the space enclosed by the four sector ring thin walls;

[0016] The electromagnetic coil is fixed to the lower end of the upper end cover of the cavity, and the electromagnetic coil is directly opposite the thin wall cylindrical structure below; The electromagnetic coil is connected to the coil storage battery, and the four piezoelectric sheets are connected to the piezoelectric storage battery.

[0017] The coil storage battery fixed to the upper end cover of the cavity is located directly above the electromagnetic coil, and the piezoelectric storage battery fixed to the stabilizer cavity is located directly below the base.

[0018] The upper interface assembly and the lower joint assembly are provided with threads at their ends for connection with the drill pipe; The drilling fluid enters the diverter through the upper interface assembly, then enters the confluence through the middle flow pipe, and finally flows through the lower joint for drilling operations.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. The drill stabilizer with integrated self-adaptive adjustment of the swirl angle of the centralizer and energy harvesting and vibration damping of the present invention has the centralizer in a vertical state in the non-working state, which can ensure the smooth lowering of the drill stabilizer and reduce the friction with the well wall;

[0021] In the working state, directly using the high-pressure drilling fluid during the drilling process as the power source for the deflection of the centralizer, only by controlling the energization of the solenoid valve can the swirl angle of the centralizer be controlled through the transmission system, and the control of the swirl angle of the centralizer is achieved in an energy-saving and stable manner. At the same time, the automatic optimization control system can adjust the solenoid valve according to the on-site requirements to control the size of the swirl angle of the centralizer.

[0022] 2. A vibration energy absorption device with coordinated spring-hydraulic-particle damping is designed at the upper end of the stabilizer, which reduces the drill string bounce and axial vibration of the system, and is beneficial to improving the service life of parts and the drilling quality.

[0023] 3. A vibration energy harvesting device is designed inside the cavity, which can convert vibration energy into storable electrical energy, improve the energy utilization efficiency, and at the same time can provide energy self-supply for components such as sensors, controllers, and solenoid valves in the system. Description of the Drawings

[0024] Figure 1 It is a structural schematic diagram of a drill tool stabilizer integrating adaptive adjustment of the swirl angle of the straightening strip and energy harvesting and vibration reduction of the present invention;

[0025] Figure 2 It is a structural schematic diagram of the drill tool stabilizer with integrated swirl angle adaptive adjustment of the straightening strip and energy harvesting and vibration reduction of the present invention without the stabilizer cavity and the upper cover of the stabilizer;

[0026] Figure 3 It is a structural schematic diagram of a vibration energy absorption device of a drilling tool stabilizer integrating adaptive adjustment of the swirl angle of the straightening strip and energy collection and vibration reduction of the present invention;

[0027] Figure 4 It is a schematic cross-sectional view of a hydraulic-gear rack drive device of a drill tool stabilizer integrating adaptive adjustment of the swirl angle of the straightening bar and energy harvesting and vibration reduction of the present invention;

[0028] Figure 5 It is a partial enlarged view of the shaft system structure of the rotation of the straightening bar of the drilling tool stabilizer integrating the swirl angle adaptive adjustment of the straightening bar and the energy collection and vibration reduction of the present invention;

[0029] Figure 6 It is a schematic diagram of the structure of the piezoelectric-electromagnetic composite vibration energy device of the drilling tool stabilizer integrating the adaptive adjustment of the swirl angle of the straightening strip and the energy collection and vibration reduction of the present invention;

[0030] Figure 7 It is a schematic diagram of the distribution of the hydraulic-gear rack drive device and the piezoelectric-electromagnetic composite vibration energy device of the drilling tool stabilizer integrating the adaptive adjustment of the swirl angle of the straightening bar and the energy collection and vibration reduction of the present invention;

[0031] Figure 8 The present invention is a schematic diagram of the distribution of a circuit board and a controller of a control system of a drilling tool stabilizer integrating adaptive adjustment of the swirl angle of the straightening bar and energy harvesting and vibration reduction.

[0032] Description of the reference numerals in the drawings: 1 - upper joint assembly, 2 - upper stabilizer cover, 3 - upper end cover of the cavity, 4 - stabilizer cavity, 5 - centralizer strip, 6 - lower joint assembly, 7 - vibration energy absorption device, 101 - protruding part, 701 - particle damping box cover, 702 - particle damping, 703 - particle damping box, 704 - vibration damping hydraulic cylinder piston, 705 - vibration damping return spring, 706 - vibration damping hydraulic cylinder, 707 - hydraulic buffer bottom valve, 8 - diverter, 9 - hydraulic - rack and pinion drive device, 901 - inlet flow solenoid valve, 902 - roller bearing, 903 - key, 904 - centralizer strip rotating shaft, 905 - thrust ball bearing, 906 - gear, 907 - rack, 908 - plunger, 909 - plunger return spring, 9010 - drive hydraulic cylinder, 9011 - check valve, 9012 - hydraulic cylinder support column, 9013 - pipe support, 9014 - outlet flow solenoid valve, 9015 - steering elbow, 9016 - tee, 9017 - collar, 10 - centralizer strip screw cap, 11 - central pipe, 12 - manifold, 13 - piezoelectric - electromagnetic composite vibration energy harvesting device, 1301 - coil energy storage battery, 1302 - electromagnetic coil, 1303 - magnetic sphere, 1304 - thin - walled sector ring, 1305 - soft spring, 1306 - piezoelectric sheet, 1307 - base, 1308 - piezoelectric energy storage battery, 14 - four - hole central shaft sleeve, 15 - liquid flow - component sensor, 16 - torsional deflection angle sensor, 17 - controller and circuit board. Detailed implementation mode

[0033] The present invention will be further described in detail below with reference to the accompanying drawings.

[0034] As Figures 1 to 8The embodiment of the present invention shown includes: an upper sub assembly 1, an upper stabilizer cover 2, an upper end cover of the cavity 3, a stabilizer cavity 4, four centralizer bars 5, a vibration energy absorption device 7, a lower sub assembly 6, a diverter 8, four centralizer bar drive systems 9, a middle flow pipe 11 and a manifold 12. The outer periphery of the upper sub assembly 1 is in spline profile fit with the diverter 8. At the same time, the protruding part 101 on the outer side of the lower part of the upper sub assembly 1 is connected to the upper end of the vibration damping hydraulic cylinder piston 704 of the vibration energy absorption device 7 with spring-hydraulic-particle damping cooperation by screws. The bottom of the vibration energy absorption device 7 is connected to the upper end face of the upper end cover 3 of the cavity by screws; the lower flange part of the upper stabilizer cover 2 is connected to the upper end cover 3 of the cavity by screws; the upper end cover 3 of the cavity is fixed to the upper end face of the side wall of the stabilizer cavity 4 by bolts; the four centralizer bar drive systems 9 are circumferentially and evenly arranged in the cylindrical space surrounded by the upper end cover 3 of the cavity and the stabilizer cavity 4; the centralizer bars 5 arranged on the outer side of the stabilizer cavity 4 are fixed to the centralizer bar rotating shafts 904 in the corresponding centralizer bar drive systems 9 through centralizer bar screw caps 10, so as to realize the axial positioning of the centralizer bars 5 and the centralizer bar rotating shafts 904, and enable the centralizer bars 5 to rotate around the centralizer bar rotating shafts 904 driven by the centralizer bar drive systems 9; the middle interface of the diverter 8 is hermetically fixed to the middle pipe 11, and the lower end of the middle flow pipe 11 is hermetically fixedly connected to the middle interface of the manifold 12; the lower sub assembly is connected to the cavity by threads. Threads are provided at the ends of the upper interface assembly 1 and the lower sub assembly 6, and can be connected to the drill pipe. During operation, the drilling fluid can enter the diverter 8 through the upper interface assembly 1, then enter the manifold 12 through the middle flow pipe 11, and finally flow through the lower sub 6 for drilling operations.

[0035] The centralizer bar drive system 9 includes: an inlet solenoid valve 901, a roller bearing 902, a key 903, a centralizer bar rotating shaft 904, a thrust ball bearing 905, a gear 906, a rack 907, a plunger 908, a plunger return spring 909, a drive hydraulic cylinder 9010, a check valve 9011, a hydraulic cylinder support column 9012, a pipe support 9013, an outlet solenoid valve 9014, a steering elbow 9015 and a tee 9016. Among them, the diversion interface of the diverter 8, the inlet of the inlet solenoid valve 901, the outlet of the inlet solenoid valve 901, the first steering elbow 9015, the inlet of the check valve 9011, the outlet of the check valve 9011, the first interface of the tee 9016, the second interface of the tee 9016 and the hydraulic inlet of the drive hydraulic cylinder 9010 are hermetically fixed in sequence. Among them, the axes of the first interface and the second interface of the tee 9016 are collinear; the third interface of the tee 9016, the second steering elbow, the outlet solenoid valve 9014, the third steering elbow and the diversion interface of the manifold 12 are hermetically fixed in sequence; the number of the diversion interfaces of the diverter 8 and the diversion interfaces of the manifold 12 matches the number of the centralizer bar drive systems 9, both are 4 and are circumferentially and evenly arranged;

[0036] The upper and lower ends of the hydraulic cylinder support column 9012 are respectively fixed to the barrel bottom of the driving hydraulic cylinder 9010 and the stabilizer cavity 4. Inside the driving hydraulic cylinder 9010, there are a plunger 908 and a plunger return spring 909. The plunger 908 is pushed upward by the pressure from the hydraulic inlet. After the pressure is lost, the plunger 908 descends due to the action of the plunger return spring 909. The end of the plunger 908 is machined with threads and is threadedly connected to the rack 907, enabling the rack 907 to move with the plunger 908. The rack 907 cooperates with the gear 906 on one side. The gear 906 is fixedly installed on the shaft 904 and is positioned by a key and a sleeve.

[0037] The inner end of the centralizer bar rotating shaft 904 is installed in the four-hole central shaft sleeve 14 through a roller bearing 902. The four-hole central shaft sleeve 14 is sleeved and fixed outside the lower end of the diverter 8. The upper end of the four-hole central shaft sleeve 14 abuts against the lower end face of the cavity upper end cover 3, thereby fixing the four-hole central shaft sleeve 14. The outer side of the centralizer bar rotating shaft 904 is installed on the stabilizer cavity 4 through a roller bearing 902. The outer end of the centralizer bar rotating shaft 904 is machined with threads. After the centralizer bar 5 is placed and axially positioned by a key, the centralizer bar screw cap 10 is screwed in to complete the fixation of the centralizer bar, enabling the centralizer bar 5 to rotate together with the centralizer bar rotating shaft.

[0038] A thrust ball bearing 905 is additionally provided between the outer side of the centralizer bar rotating shaft 904 and the stabilizer cavity 4, which is more conducive to the rotation of the centralizer bar. This structure can use the high-pressure drilling fluid during the working process as the power source for driving the centralizer bar. By simply controlling the opening and closing degree of the solenoid valve, the deflection angle and deflection speed of the centralizer bar can be controlled.

[0039] The inlet flow solenoid valve 901 and the outlet flow solenoid valve 9014 are composed of a hydraulic valve housing, an iron core, an iron core return spring, an electromagnetic coil, and an electromagnetic coil cover. When not energized, the iron core closes the water inlet under the action of the spring force. When energized, the iron core opens the water inlet under the action of the magnetic force.

[0040] The check valve is composed of a check valve housing, a spring, and a flow blocking ball. When the water flow reverses, the flow blocking ball will block the channel to prevent reverse flow.

[0041] In this embodiment, the sealing and fixing method is: fixing through sealant and the coupling 9017. In this embodiment, the axis of the centralizer bar rotating shaft 904 is aligned with the axis of the middle flow pipe 11, and at the same time, the center of gravity of the centralizer bar 5 is also on the extension line of the axis of the centralizer bar rotating shaft 904 to maintain a better centralizing effect.

[0042] When drilling is finished or a failure occurs and the drill pipe needs to be removed, or when the drill pipe needs to be reinserted during drilling, the swirl state of the drilling fluid in the environment and the concentration of rock cuttings are detected by the liquid flow-component sensor 15, and under the control of the swirl angle automatic optimization control system, the inlet solenoid valve 901 is closed, the outlet solenoid valve 902 is opened, and the remaining drilling fluid in the hydraulic cylinder flows into the manifold through the outlet solenoid valve 902. Due to the presence of the reset spring 909, the plunger 908 in the hydraulic pump 9010 retreats, and the straightening bar 5 is restored to vertical. At the same time, the reset spring 909 has a large rigidity, and when there is no high-pressure drilling fluid injected into the system, the straightening bar 5 can be maintained in a vertical state. In this way, during the recovery and non-rotational lowering of the drill string, the straightening bar 5 is in a vertical state, which can reduce the friction with the well wall, ensure the smooth lowering of the drill tool stabilizer, and improve the accuracy and safety of the wellbore.

[0043] The discharge solenoid valve 9014 and the inlet solenoid valve 901 are both connected to the circuit board 17 in the corresponding swirl angle automatic optimization control system, which includes: a liquid flow and component sensor 15, a torsion angle sensor 16, a controller and a circuit board 17. The liquid flow and component sensor 15 is installed in the lower flange of the stabilizer upper cover 2, and is used to monitor the flow rate, flow velocity and density of the downhole drilling fluid, and then monitor the swirl state of the downhole drilling fluid and the efficiency of cuttings transportation; the torsion angle sensor 16 is installed in the opening on the upper part of the straightening bar, and is used to detect the swirl angle of the straightening bar; then the signal is transmitted to the corresponding circuit board and controller 17, and after the algorithm is calculated, the automatic optimization of the swirl angle of the straightening bar under the current working condition is completed. The circuit board and controller 17 are installed on the upper end cover 3 of the cavity. Each straightening bar drive system 9 is connected and corresponds to a circuit board and controller 17. Each circuit board and controller 17 is designed through an algorithm to automatically optimize the swirl angle of the straightening bar under the current working conditions, and accurately control the opening and closing of the solenoid valve of the corresponding hydraulic-gear rack drive device to achieve control of the swirl angle of the straightening bar.

[0044] During the drilling process, when the deflection angle of the centralizer needs to be increased, each corresponding circuit board and controller 17 control the corresponding inflow solenoid valve 901 to open and the outflow solenoid valve 9014 to close. The drilling fluid enters the hydraulic-rack and pinion drive device 9 through the diverter and finally enters the drive hydraulic cylinder 9010. The plunger 908 pushes the rack 907 to rise, and the rack 907 causes the cooperating gear 906 to rotate, thereby rotating the centralizer rotating shaft 904 and finally driving the increase of the centralizer deflection angle. When the deflection angle needs to be decreased, the inflow solenoid valve 901 closes and the outflow solenoid valve 9014 opens. Due to the existence of the check valve 9011, the drilling fluid in the drive hydraulic cylinder 9010 enters the manifold through the outflow solenoid valve 9014, and the plunger return spring 909 causes the plunger 908 to descend, finally driving the decrease of the centralizer deflection angle. Four groups of centralizer drive devices are evenly distributed in the whole system to achieve accurate control of each centralizer.

[0045] The vibration energy absorption device 7 includes: a particle damping box cover 701, particle damping 702, a particle damping box 703, a vibration damping hydraulic cylinder piston 704, a vibration damping return spring 705, a vibration damping hydraulic cylinder 706, and a hydraulic buffer bottom valve 707. After the vibration damping hydraulic cylinder piston 704 is sleeved into the vibration damping return spring 705, it is placed into the vibration damping hydraulic cylinder 706, and the vibration damping hydraulic cylinder 706 is filled with hydraulic oil. In the compression stage, the piston rod moves downward, and most of the oil in the lower chamber of the inner cylinder flows into the liquid storage chamber through the hydraulic buffer bottom valve 707, generating compression damping. Four spring-hydraulic vibration damping devices are evenly distributed on the upper end cover 3 of the cavity and are connected by threads; the particle damping 702 is placed in the cavity formed by the particle damping box 703 and the particle damping box cover 701, and the energy of the structural vibration is consumed through the damping characteristics of the particle damping agent to achieve the purpose of vibration reduction and noise reduction. The particle damping box 703 is welded to the collar of the upper joint assembly 1. When the system vibrates, the spring-hydraulic vibration damping device and the particle damping vibration damping device can absorb the vibration and buffer the vibration transmitted to the upper joint.

[0046] A piezoelectric-electromagnetic composite vibration energy harvesting system is installed in the stabilizer cavity 4. The piezoelectric-electromagnetic composite vibration energy harvesting system consists of eight piezoelectric-electromagnetic composite vibration energy harvesting devices 13, which improves the utilization rate of vibration energy. The piezoelectric-electromagnetic composite vibration energy harvesting device 13 includes: an energy storage battery 1301, an electromagnetic coil 1302, a magnetic sphere 1303, a fan ring thin wall 1304, a soft spring 1305, a piezoelectric sheet 1306 and a base 1307, wherein the base 1307 is fixed to the barrel bottom of the stabilizer cavity 4, and four fan ring thin walls 1306 are fixed on the base 1307. 04 and a soft spring 1305, the central angle of each fan ring thin wall 1304 is 90°, four concentrically arranged fan ring thin walls 1304 form a thin-walled cylindrical structure, and the outer side of each thin-walled cylinder 1304 is installed with a piezoelectric sheet 1306; a magnetic sphere 1303 is fixed to the upper end of the soft spring 1305 by welding, and the magnetic sphere 1303 is located in the center of the space surrounded by the four fan ring thin walls 1304 in the natural state, and the base 1307, the magnetic sphere 1303, the four fan ring thin walls 1304 and a soft spring 1305 form a piezoelectric device;

[0047] The electromagnetic coil 1302 is fixed to the lower end of the upper end cover 3 of the cavity, and the electromagnetic coil 1302 is directly facing the thin-walled cylindrical structure below; the electromagnetic coil 1302 is connected to the coil energy storage battery 1301, and the four piezoelectric sheets 1306 are connected to the piezoelectric energy storage battery 1308.

[0048] The soft spring 1305 has a small stiffness. During the drilling process, due to the violent vibration of the drill bit, the magnetic sphere 1303 is easy to vibrate with the whole system; when the magnetic sphere hits the thin wall, the piezoelectric sheet 1306 on the thin wall bends, and the piezoelectric effect generates electrical energy, which is stored in the energy storage battery connected to the piezoelectric component; at the same time, due to the irregular movement of the magnetic sphere 1303, the magnetic field in the electromagnetic coil 1302 is constantly changing, and a current is formed through electromagnetic induction, which is stored in the energy storage battery connected to the electromagnetic coil 1302. In this way, the conversion and utilization of vibration energy in the working process is realized. The piezoelectric-electromagnetic composite vibration energy harvesting system consists of eight piezoelectric-electromagnetic composite vibration energy harvesting devices, which improves the utilization rate of vibration energy.

[0049] In this embodiment, the coil energy storage battery 1301 fixed to the cavity upper end cover 3 is located directly above the electromagnetic coil 1302 , and the piezoelectric energy storage battery 1308 fixed to the stabilizer cavity 4 is located directly below the base 1307 .

[0050] In the working state of this embodiment, the high-pressure drilling fluid during the drilling process is directly used as the power source for the deflection of the centralizer strip. By simply controlling the energization of the solenoid valve, the swirl angle of the centralizer strip can be controlled through the transmission system, achieving the control of the swirl angle of the centralizer strip in an energy-saving and stable manner. At the same time, the automatic optimization control system can adjust the solenoid valve according to the on-site requirements to control the size of the swirl angle of the centralizer strip. Meanwhile, the damping-spring vibration damping device reduces the bit bounce and axial vibration of the system, which is beneficial to improving the service life of parts and the drilling quality. The vibration energy collection device can convert the vibration energy into storable electrical energy, improving the energy utilization efficiency and enabling the self-power supply for components such as sensors, circuit boards, controllers, and solenoid valves in the system.

Claims

1. A drill stabilizer with adaptive adjustment of the swirl angle of the straightening bar, characterized in that: include: An upper joint assembly (1), a stabilizer upper cover (2), a cavity upper end cover (3), a stabilizer cavity (4), a plurality of straightening bars (5), a vibration energy absorbing device (7), a lower joint assembly (6), a flow divider (8), a plurality of straightening bar drive systems (9), a middle flow pipe (11) and a confluence (12); the outer periphery of the upper joint assembly (1) and the flow divider (8) are matched with a spline profile; at the same time, the extension portion (101) on the lower outer side of the upper joint assembly (1) is connected to the upper end of the vibration damping hydraulic cylinder piston (704) of the vibration energy absorbing device (7) by screws; the bottom of the vibration energy absorbing device (7) is connected to the upper end surface of the cavity upper end cover (3) by screws; the lower end flange portion of the stabilizer upper cover (2) is connected to the upper end of the cavity The cover (3) is connected by screws; the upper end cover (3) of the cavity is fixed to the upper end surface of the side wall of the stabilizer cavity (4) by bolts; a plurality of straightening bar driving systems (9) are evenly arranged in the circumferential direction in the cylindrical space surrounded by the upper end cover (3) of the cavity and the stabilizer cavity (4); the straightening bar (5) arranged on the outside of the stabilizer cavity (4) is fixed to the straightening bar rotating shaft (904) in the corresponding straightening bar driving system (9), so that the straightening bar (5) is driven by the straightening bar driving system (9) to rotate around the straightening bar rotating shaft (904); the middle interface of the diverter (8) is fixed to the middle pipe (11) by sealing, and the lower end of the middle flow pipe (11) is connected to the middle interface of the confluence (12) by sealing; the lower joint assembly is connected to the cavity by threads; The straightening bar driving system (9) comprises: an inlet electromagnetic valve (901), a roller bearing (902), a straightening bar rotating shaft (904), a thrust ball bearing (905), a gear (906), a rack (907), a plunger (908), a plunger return spring (909), a driving hydraulic cylinder (9010), a one-way valve 9011, a hydraulic cylinder support column (9012), a pipe support (9013), a discharge electromagnetic valve (9014), a steering elbow (9015) and a three-way pipe (9016), wherein the flow diversion interface of the diverter (8), the inlet of the inlet electromagnetic valve (901), the outlet of the inlet electromagnetic valve (901), the first steering elbow (9015), the one-way valve ( The inlet of the three-way pipe (9011), the outlet of the one-way valve (9011), the first interface of the three-way pipe (9016), the second interface of the three-way pipe (9016) and the hydraulic inlet of the driving hydraulic cylinder (9010) are sealed and fixed in sequence, wherein the axes of the first interface of the three-way pipe (9016) and the second interface of the three-way pipe (9016) are collinear; the third interface of the three-way pipe (9016), the second steering elbow, the discharge solenoid valve (9014), the third steering elbow and the branch interface of the flow combiner (12) are sealed and fixed in sequence; the number of the branch interface of the flow divider (8) and the branch interface of the flow combiner (12) matches the number of the straightening bar driving system (9), and are respectively evenly arranged in the circumferential direction; The upper and lower ends of the hydraulic cylinder support column (9012) are respectively fixed to the bottom of the driving hydraulic cylinder (9010) and the stabilizer chamber (4). The driving hydraulic cylinder (9010) contains a plunger (908) and a plunger return spring (909). The plunger (908) is pushed up by the pressure coming from the hydraulic inlet. After the pressure is lost, the plunger (908) is lowered due to the action of the plunger return spring (909). The end of the plunger (908) is processed with a thread and is threadedly connected to the rack (907) so that the rack (907) is connected to the gear rack. The rack (907) can move with the plunger (908); the rack (907) cooperates with the gear (906) on one side; the gear (906) is fixedly installed on the shaft (904); the inner end of the straightening bar rotating shaft (904) is installed in the four-hole center shaft sleeve (14) through a roller bearing (902), and the four-hole center shaft sleeve (14) is fixedly mounted on the lower end of the diverter (8); the outer side of the straightening bar rotating shaft (904) is installed on the stabilizer cavity (4) through a roller bearing (902).

2. A drill tool stabilizer with adaptive adjustment of the swirl angle of the straightening strip according to claim 1, characterized in that: The sealing and fixing method is: fixing through sealant and a coupling.

3. The drill tool stabilizer with adaptive adjustment of the swirl angle of the straightening strip according to claim 1, characterized in that: A thrust ball bearing (905) is additionally provided between the outer side of the straightening bar rotating shaft (904) and the stabilizer cavity (4), which is more conducive to the rotation of the straightening bar. This structure can use the high-pressure drilling fluid in the working process as the power source for driving the straightening bar. The deflection angle and deflection speed of the straightening bar can be simply controlled by controlling the opening and closing degree of the electromagnetic valve.

4. The drill tool stabilizer with adaptive adjustment of the swirl angle of the straightening strip according to claim 1, characterized in that: The axis of the rotating shaft (904) of the straightening bar is directly opposite to the axis of the middle flow tube (11), and the center of gravity of the straightening bar (5) is also on the extension line of the axis of the rotating shaft (904) of the straightening bar.

5. The drill tool stabilizer with adaptive adjustment of the swirl angle of the straightening strip according to claim 1, characterized in that: The discharge solenoid valve (9014) and the inlet solenoid valve (901) are both connected to a circuit board (17) in a corresponding swirl angle automatic optimization control system; The automatic optimization control system for swirl angle comprises: a liquid flow and component sensor (15), a torsion angle sensor (16), a controller and a circuit board (17), wherein the liquid flow and component sensor (15) is installed in the lower flange of the stabilizer upper cover (2) and is used to monitor the flow rate, flow velocity and density of the downhole drilling fluid, and further monitor the swirl state of the downhole drilling fluid and the cuttings transportation efficiency; the torsion angle sensor (16) is installed in the opening on the upper part of the straightening bar and is used to detect the swirl angle of the straightening bar; then the signal is transmitted to the corresponding circuit board and controller (17); the circuit board and controller (17) are installed on the upper end cover (3) of the cavity, and each straightening bar driving system (9) is connected and corresponds to a circuit board and controller (17).

6. A drill stabilizer with adaptive adjustment of the swirl angle of the straightening strip according to claim 5, characterized in that: When the deflection angle of the straightening bar needs to be increased, the corresponding circuit board and controller (17) control the corresponding inlet solenoid valve (901) to open and the outlet solenoid valve (9014) to close, and the drilling fluid enters the hydraulic-gear rack drive device (9) through the diverter, and finally enters the driving hydraulic cylinder (9010), and the plunger (908) pushes the rack (907) to rise, and the rack (907) causes the gear (906) matched therewith to rotate, thereby causing the straightening bar rotating shaft (904) to rotate, and finally driving the straightening bar deflection angle to increase; when the deflection angle needs to be reduced, the inlet solenoid valve (901) is closed, and the outlet solenoid valve (9014) is opened. Due to the presence of the one-way valve (9011), the drilling fluid in the driving hydraulic cylinder (9010) enters the confluence device through the outlet solenoid valve (9014), and the plunger return spring (909) causes the plunger (908) to descend, and finally driving the straightening bar (5) to reduce the deflection angle.

7. The drill tool stabilizer with adaptive adjustment of the swirl angle of the straightening strip according to claim 1, characterized in that: The vibration energy absorbing device (7) comprises: a particle damping box cover (701), a particle damping (702), a particle damping box (703), a vibration damping hydraulic cylinder piston (704), a vibration damping return spring (705), a vibration damping hydraulic cylinder (706) and a hydraulic buffer bottom valve (707); the vibration damping hydraulic cylinder piston (704) is inserted into the vibration damping return spring (705) and then placed in the vibration damping hydraulic cylinder (706); the vibration damping hydraulic cylinder (706) contains hydraulic oil; in the compression stage, the piston rod moves downward, and most of the oil in the lower chamber of the inner cylinder flows into the liquid storage chamber through the hydraulic buffer bottom valve (707), thereby generating compression damping; the particle damping (702) is placed in a cavity formed by the particle damping box (703) and the particle damping box cover (701); the particle damping box (703) is welded to the shaft ring of the upper joint assembly (1).

8. The drill tool stabilizer with adaptive adjustment of the swirl angle of the straightening strip according to claim 1, characterized in that: A plurality of piezoelectric-electromagnetic composite vibration energy harvesting devices (13) are installed in the stabilizer cavity (4); The piezoelectric-electromagnetic composite vibration energy harvesting device (13) comprises: an energy storage battery (1301), an electromagnetic coil (1302), a magnetic sphere (1303), a fan ring thin wall (1304), a soft spring (1305), a piezoelectric sheet (1306) and a base (1307), wherein the base (1307) is fixed to the bottom of the stabilizer cavity (4), and four fan ring thin walls (1304) and a soft spring (1305) are fixed on the base (1307). 05), the central angle of each fan ring thin wall (1304) is 90°, four concentrically arranged fan ring thin walls (1304) form a thin-walled cylindrical structure, and a piezoelectric sheet (1306) is installed on the outer side of each thin-walled cylinder (1304); a magnetic sphere (1303) is fixed to the upper end of the soft spring (1305) by welding, and the magnetic sphere (1303) is located in the center of the space surrounded by the four fan ring thin walls (1304) in the natural state; The electromagnetic coil (1302) is fixed to the lower end of the upper end cover (3) of the cavity, and the electromagnetic coil (1302) is directly opposite to the thin-walled cylindrical structure below; the electromagnetic coil (1302) is connected to the coil energy storage battery (1301), and the four piezoelectric sheets (1306) are connected to the piezoelectric energy storage battery (1308).

9. The drill tool stabilizer with adaptive adjustment of the swirl angle of the straightening strip according to claim 1, characterized in that: The coil energy storage battery (1301) fixed to the upper end cover (3) of the cavity is located directly above the electromagnetic coil (1302), and the piezoelectric energy storage battery (1308) fixed to the stabilizer cavity (4) is located directly below the base (1307).

10. The drill tool stabilizer with adaptive adjustment of the swirl angle of the straightening strip according to claim 1, characterized in that: The ends of the upper interface component (1) and the lower joint component (6) are provided with threads and connected to the drill pipe; the drilling fluid enters the flow divider (8) through the upper interface component (1), then enters the flow concentrator (12) through the middle flow pipe (11), and finally flows through the lower joint (6) for drilling operations.

Images