Oscillating impact downhole power tool

Abstract

The present application relates to the field of drilling technology, and is a kind of oscillation impact composite downhole power tool, comprising oscillation assembly, power assembly, output spindle and impact assembly, the power assembly comprises stator and rotor, the rotor capable of rotating through fluid or gas is installed in the stator.The present application is reasonable and compact, by setting the oscillation assembly, the oscillation assembly can form pulse oscillation fluid on the upper part of the power assembly, thereby driving the drill string to move downward with high frequency and low amplitude, when the rotor rotates, the impact assembly can make the output spindle rotate with the rotor and make the output spindle reciprocate along the axial direction, so that the impact force of the output spindle reciprocating along the axial direction can be transmitted to the drill bit installed at the lower end of the output spindle, and the rock breaking efficiency is improved.Under the combined action of oscillation and impact, the problems of low inclination rate, low drilling efficiency and slow drilling speed in large size borehole build-up section of directional well and horizontal well can be effectively solved, and the goal of increasing speed and efficiency is achieved.

Description

Technical Field

[0001] This invention relates to the field of drilling technology and is a composite downhole power tool with oscillation and impact. Background Technology

[0002] Large-diameter wells suffer from large gaps between the drill string and the wellbore, resulting in insufficient hydraulic parameters, inadequate bottom-hole cleaning, sand-carrying, and rock-breaking capabilities, high friction between the drill string and the wellbore, and a tendency to cause pressure build-up, leading to a lower build-up rate and impacting directional drilling efficiency and mechanical drilling speed. Currently, there are various vibration drag reduction tools with good application results and large-scale deployment in China, each with different structures and characteristics. However, drag reduction tools for directional drilling of 311mm and larger diameter wells are relatively lacking. Therefore, it is necessary to develop relevant friction-reducing and drag-lowering tools for large-diameter wells and to combine them with directional drilling tools to improve the directional drilling speed of large-diameter wells. Summary of the Invention

[0003] This invention provides an oscillation-impact composite downhole power tool that overcomes the shortcomings of the prior art and can effectively solve the problems of easy pressure build-up, low build-up rate, and low drilling speed in existing large-diameter wellbore directional drilling.

[0004] The technical solution of the present invention is achieved through the following measures: an oscillation and impact composite downhole power tool, comprising an oscillation assembly, a power assembly, an output spindle, and an impact assembly. The power assembly includes a stator and a rotor. A rotor capable of rotating through fluid or gas is installed inside the stator. An oscillation assembly capable of forming pulsed oscillation fluid is provided at the upper end of the rotor. A hollow output spindle is provided below the rotor. An impact assembly is installed between the lower end of the rotor and the output spindle. The impact assembly can cause the output spindle to reciprocate axially as the rotor rotates.

[0005] The following are further optimizations and / or improvements to the above-mentioned technical solution:

[0006] The aforementioned oscillation assembly may include an oscillation housing, a fixed valve seat, a fixed valve core, a moving valve seat, a moving valve core, and an anti-drop connecting rod. An anti-drop housing is fixedly installed at the lower end of the oscillation housing, and the lower end of the anti-drop housing is fixedly installed together with the upper end of the stator. A fixed valve seat, with its lower end located inside the upper part of the anti-drop housing, is slidably installed on the inner side of the oscillation housing along the axial direction. The upper end of the fixed valve seat has an eccentric hole that extends vertically. A fixed valve core is fixedly installed on the inner side of the lower end of the eccentric hole. An upper flow hole, coaxial with the eccentric hole, is provided on the upper end of the fixed valve core. An anti-drop connecting rod, with its upper end located below the fixed valve seat, is fixedly installed on the inner side of the upper end of the rotor. The outer side of the upper end of the anti-drop connecting rod... The valve core is slidably mounted on the inner side of the lower part of the moving valve seat along the axial direction. The upper center of the moving valve seat has a first mounting groove with an upward opening. Several drain holes with their upper ends communicating with the first mounting groove are evenly distributed along the circumference on the outer side of the lower part of the moving valve seat. The moving valve core with its upper end in contact with the lower end of the fixed valve core is fixedly mounted on the inner side of the upper end of the first mounting groove above the drain hole. The upper end of the moving valve core has a lower flow hole that runs through the upper and lower parts. When the moving valve core rotates, the overlapping area of ​​the lower flow hole and the upper flow hole projected on the horizontal plane can periodically increase and decrease. An anti-drop ring platform is fixed on the inner side of the lower part of the anti-drop housing.

[0007] The aforementioned impact assembly may include a connecting assembly, an upper bearing assembly, a lower bearing assembly, an elastic reset component, and a power housing. The lower end of the stator and the upper end of the power housing are fixedly mounted together. A drive shaft is coaxially mounted inside the power housing. An upper bearing assembly is installed between the outer side of the drive shaft and the inner side of the power housing. The upper end of the drive shaft and the lower end of the rotor are connected together by a connecting assembly mounted on the inner side of the upper part of the power housing. The lower end of the connecting assembly has a first flow channel extending to the outer side of the lower part of the connecting assembly, and the upper end of the drive shaft has a second flow channel opening upwards. The lower end of the drive shaft has a second flow channel with an upper end connecting to the outer side of the upper part of the drive shaft. The third flow channel is connected to the upper end of the second flow channel. The outer side of the upper end of the output spindle is axially slidably installed in the third flow channel. The outer side of the upper part of the output spindle is provided with at least one outward-facing slot along the circumference. The outer side of the lower part of the transmission spindle corresponding to each slot is provided with a radially penetrating mounting screw hole. Each mounting screw hole is screwed with an anti-drop pin whose end is slidably installed in the corresponding slot. A lower bearing assembly is provided between the outer side of the lower part of the output spindle and the inner side of the lower part of the power housing. An elastic reset member is provided on the outer side of the upper part of the output spindle corresponding to the position between the upper end of the lower bearing assembly and the lower end of the transmission spindle.

[0008] The aforementioned lower bearing assembly may include a lower TC inner sleeve, a lower TC outer sleeve, an upper impact bushing, a lower impact bushing, and steel balls. A tapered mounting surface, smaller at the top and larger at the bottom, is provided on the outer side of the lower part of the output spindle, corresponding to the position below the power housing. A lower TC inner sleeve is fitted onto the outer side of the lower part of the output spindle on the mounting surface. A lower TC outer sleeve is fitted onto the outer side of the lower TC inner sleeve and fixedly mounted to the inner side of the lower end of the power housing. A locking nut is fixedly mounted on the outer side of the lower part of the output spindle, corresponding to the position above the lower TC inner sleeve. A lower impact bushing, fitted between the inner side of the power housing and the outer side of the output spindle, is fixedly mounted on the upper end of the locking nut. Several upward-opening lower track grooves are distributed circumferentially on the upper end of the lower impact bushing. The lower inner wall of the track groove includes a vertical surface, a first horizontal surface, an inclined surface, and a second horizontal surface that are connected in sequence along the rotor rotation direction. The second horizontal surface is located above the first horizontal surface. The second horizontal surface of each lower track groove is transitionally connected to the upper end of the vertical surface of the adjacent lower track groove. A steel ball is installed in the lower track groove. The inner side of the power housing and the outer side of the upper impact shaft sleeve are splined together at the position above the lower impact shaft sleeve. The lower end of the upper impact shaft sleeve corresponding to each lower track groove position is provided with an upper track groove that opens downward and has the same structure as the lower track groove. The upper part of the steel ball is located in the upper track groove. The elastic reset member is installed between the upper end of the upper impact shaft sleeve and the lower end of the transmission main shaft.

[0009] The upper end of the aforementioned lower impact bushing may have 3 to 5 lower track grooves distributed along the circumference.

[0010] The lower outer side of the lower TC inner sleeve, located below the lower TC outer sleeve, can be fixed with a limiting ring platform, and an adjusting shim is provided between the upper end of the elastic reset component and the lower end of the transmission main shaft.

[0011] The aforementioned upper bearing assembly may include an upper TC inner sleeve, an upper TC outer sleeve, and a thrust bearing. A mounting step surface is provided on the lower outer side of the transmission main shaft corresponding to the position above the third flow channel. A thrust bearing is mounted on the mounting step surface, which is fitted between the outer side of the transmission main shaft and the inner side of the power housing. An upper TC inner sleeve is mounted on the upper end of the thrust bearing, with its inner side fixedly mounted to the upper outer side of the transmission main shaft. An upper TC outer sleeve is fitted on the outer side of the upper TC inner sleeve, with its outer side fixedly mounted to the inner side of the power housing.

[0012] The aforementioned connecting components may include a rotor joint, a universal coupling, and a drive shaft joint. The upper end of the rotor joint is fixedly installed together with the lower end of the rotor. The lower end of the rotor joint and the upper end of the drive shaft joint are connected together by a universal coupling. The first flow channel includes a main flow channel located at the center of the lower end of the drive shaft joint and opening downwards, and secondary flow channels evenly distributed around the lower outer part of the drive shaft joint and communicating with the upper part of the main flow channel. The lower end of the drive shaft joint is fixedly installed together with the upper end of the drive shaft.

[0013] The aforementioned power housing may include a connecting housing, a first transmission housing, a second transmission housing, and a third transmission housing, which are fixedly installed together from top to bottom. The upper end of the connecting housing is fixedly installed together with the lower end of the rotor. The inner side of the upper end of the first transmission housing is fixedly installed together with the outer side of the upper TC sleeve. The inner side of the upper part of the second transmission housing is fixedly installed together with the outer side of the lower end of the transmission main shaft. The inner side of the upper part of the third transmission housing is splinedly connected to the outer side of the upper impact shaft sleeve. The inner side of the lower end of the third transmission housing is fixedly installed together with the outer side of the lower TC sleeve.

[0014] The lower inner side of the aforementioned moving valve seat can be fitted with an anti-drop nut that is fixedly installed on the upper outer side of the anti-drop connecting rod. Corresponding to the position below the anti-drop nut, an anti-drop retaining ring with an outer diameter larger than the inner diameter of the anti-drop ring platform is installed on the upper outer side of the anti-drop screw.

[0015] This invention features a rational and compact structure. By incorporating an oscillation assembly, a pulsed oscillating fluid is generated above the power assembly, causing the drill string to creep downwards at a high frequency and low amplitude. As the rotor rotates, the impact assembly causes the output spindle to rotate with the rotor and reciprocate axially. This allows the impact force from the axial reciprocating motion of the output spindle to be transmitted to the drill bit mounted at the lower end of the output spindle, improving rock-breaking efficiency. The combined effect of oscillation and impact effectively solves the problems of low build-up rate, low drilling efficiency, and slow drilling speed in large-diameter wellbore build-up sections of directional and horizontal wells, achieving the goal of increasing speed and efficiency. Attached Figure Description

[0016] Appendix Figure 1 This is a schematic diagram of the front sectional view of Embodiment 1.

[0017] Appendix Figure 2 This is a top sectional view of the valve core in Example 1.

[0018] Appendix Figure 3 This is a top sectional view of the moving valve core in Example 1.

[0019] Appendix Figure 4 This is a schematic diagram of the front sectional view of the moving valve seat in Embodiment 1.

[0020] Appendix Figure 5 This is a schematic diagram showing the unfolded lower track groove in Embodiment 3.

[0021] The codes in the attached diagram are as follows: 1 for stator, 2 for rotor, 3 for oscillating housing, 4 for fixed valve seat, 5 for fixed valve core, 6 for moving valve seat, 7 for moving valve core, 8 for anti-drop connecting rod, 9 for anti-drop housing, 10 for eccentric hole, 11 for upper flow hole, 12 for first mounting groove, 13 for drain hole, 14 for lower flow hole, 15 for anti-drop ring, 16 for output spindle, 17 for elastic reset element, 18 for transmission spindle, 19 for main flow channel, 20 for secondary flow channel, 21 for second flow channel, 22 for mounting surface, 23 for strip groove, 24 for anti-drop pin, 25 for upper TC inner sleeve, and 26 for upper TC outer sleeve. 27 is the upper impact bushing, 28 is the lower impact bushing, 29 is the steel ball, 30 is the lock nut, 31 is the mounting step surface, 32 is the vertical surface, 33 is the first horizontal surface, 34 is the inclined surface, 35 is the second horizontal surface, 36 is the limiting ring platform, 37 is the adjusting shim, 38 is the lower TC inner sleeve, 39 is the lower TC outer sleeve, 40 is the thrust bearing, 41 is the rotor joint, 42 is the universal coupling, 43 is the transmission shaft joint, 44 is the connecting housing, 45 is the first transmission housing, 46 is the second transmission housing, 47 is the third transmission housing, 48 is the anti-drop nut, and 49 is the anti-drop retaining ring. Detailed Implementation

[0022] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0023] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.

[0024] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0025] Example 1: As shown in the attached document Figures 1 to 4As shown, this oscillation-impact composite downhole power tool includes an oscillation assembly, a power assembly, an output spindle 16, and an impact assembly. The power assembly includes a stator 1 and a rotor 2. The rotor 2, which can rotate through fluid or gas, is installed inside the stator 1. The upper end of the rotor 2 is equipped with an oscillation assembly that can generate pulsed oscillating fluid. The oscillation assembly includes an oscillation housing 3, a fixed valve seat 4, a fixed valve core 5, a moving valve seat 6, a moving valve core 7, and an anti-drop connecting rod 8. An anti-drop housing 9 is fixedly installed at the lower end of the oscillation housing 3. The lower end of the anti-drop housing 9 is fixedly installed together with the upper end of the stator 1. A fixed valve seat 4, with its lower end located on the inner side of the upper part of the anti-drop housing 9, is slidably installed on the inner side of the oscillation housing 3. The upper end of the fixed valve seat 4 is provided with an eccentric hole 10 that runs vertically through it. A fixed valve core 5 is fixedly installed on the inner side of the lower end of the eccentric hole 10. The upper end of the fixed valve core 5 is provided with an upper flow hole 11 that is coaxial with the eccentric hole 10. An upper flow hole 11, with its upper end located below the fixed valve seat 4, is fixedly installed on the inner side of the upper end of the rotor 2. The anti-drop linkage 8 is slidably mounted on the inner side of the lower part of the moving valve seat 6 along the axial direction on the outer side of the upper end of the moving valve seat 6. The moving valve seat 6 has a first mounting groove 12 with an upward opening at the center of the upper end. Several drain holes 13 with their upper ends communicating with the first mounting groove 12 are evenly distributed along the circumference on the outer side of the lower part of the moving valve seat 6. A moving valve core 7 with its upper end in contact with the lower end of the fixed valve core 5 is fixedly mounted on the inner side of the upper end of the first mounting groove 12 above the drain holes 13. The moving valve core 7 has a lower flow hole 14 that runs vertically through the upper end. When the moving valve core 7 rotates, the overlapping area of ​​the lower flow hole 14 and the upper flow hole 11 projected on the horizontal plane can periodically increase and decrease. An anti-drop ring platform 15 is fixed on the inner side of the lower part of the anti-drop housing 9. A hollow output spindle 16 is provided below the rotor 2. An impact assembly is installed between the rotor 2 and the output spindle 16. The impact assembly can cause the output spindle 16 to reciprocate along the axial direction when the rotor 2 rotates.

[0026] According to the requirements, the cross section of the lower inner side of the oscillating housing 3 and the outer contour of the fixed valve seat 4 are both regular hexagons. This allows the fixed valve seat 4 to move up and down within the oscillating housing 3 and also allows the fixed valve seat 4 and the oscillating housing 3 to rotate synchronously. The outer side of the fixed valve core 5 and the inner side of the fixed valve seat 4, and the outer side of the moving valve core 7 and the inner side of the moving valve seat 6 are all fixedly installed together by interference fit. The fixed valve core 5 and the moving valve core 7 are both made of alloy material. This can not only improve the erosion resistance of the moving valve seat 6 and the fixed valve seat 4 and extend their service life, but also change the pulse oscillation effect by changing the specifications of the upper flow hole 11 and the lower flow hole 14, which facilitates the replacement of fixed valve core 5 and moving valve core 7 of various specifications. The lower end of the anti-drop connecting rod 8 is fixedly installed together with the upper end of the rotor 2 by threaded connection. The power system is existing known technology. The rotor 2 can be an existing known turbine rotor. The inner diameter of the anti-drop ring platform 15 is smaller than the outer diameter of the upper end of the anti-drop connecting rod 8.

[0027] During operation, drilling fluid flows through the oscillating housing 3 into the stator 1 via the rotor 2 and stator 1, which drives the rotor 2 to rotate, thereby rotating the drill bit mounted at the lower end of the output spindle 16. When the rotor 2 rotates, it drives the anti-drop linkage 8 to rotate, which in turn drives the moving valve seat 6 and the moving valve core 7 to rotate. After the moving valve core 7 rotates, it can change the connection area between the lower flow hole 14 and the upper flow hole 11. When the connection area between the lower flow hole 14 and the upper flow hole 11 is the largest, that is, when the lower flow hole 14 and the upper flow hole 11 are in contact with water... When the overlapping area of ​​the projected flow on the plane is at its maximum, the pressure of the fluid decreases when it passes through the lower flow orifice 14; when the connecting area between the lower flow orifice 14 and the upper flow orifice 11 is at its minimum, that is, when the overlapping area of ​​the projected flow on the horizontal plane of the lower flow orifice 14 and the upper flow orifice 11 is at its minimum, the pressure of the fluid increases when it passes through the lower flow orifice 14. Thus, a pressure difference exists after the fluid flows through the lower flow orifice 14, which eventually forms a pulse oscillation. At the same time, it drives the anti-drop linkage to move downward with high frequency and low amplitude, which in turn drives the output spindle to move downward with high frequency and low amplitude, thus alleviating the pressure problem.

[0028] The rotor 2 of this application can rotate when fluid or gas passes through it, thus saving energy. By setting up an oscillation assembly, the oscillation assembly can generate pulsed oscillating fluid on the upper part of the power assembly, thereby driving the drill string to creep downward at a high frequency and low amplitude. When the rotor 2 rotates, the impact assembly can make the output spindle 16 rotate with the rotor 2 and make the output spindle 16 reciprocate axially. This allows the impact force of the output spindle 16 reciprocating axially to be transmitted to the drill bit installed at the lower end of the output spindle 16, improving rock breaking efficiency. Under the combined action of oscillation and impact, the problems of low build-up rate, low drilling efficiency, and slow drilling speed in the build-up section of large-diameter wellbores in directional and horizontal wells can be effectively solved, achieving the goal of speeding up and improving efficiency.

[0029] The aforementioned oscillation-impact composite downhole power tools can be further optimized and / or improved according to actual needs:

[0030] Example 2: As an optimization of the above examples, as shown in the appendix. Figure 1As shown, the impact assembly includes a connecting assembly, an upper bearing assembly, a lower bearing assembly, an elastic reset member 17, and a power housing. The lower end of the stator 1 and the upper end of the power housing are fixedly mounted together. A transmission main shaft 18 is coaxially mounted inside the power housing. An upper bearing assembly is installed between the outer side of the transmission main shaft 18 and the inner side of the power housing. The upper end of the transmission main shaft 18 and the lower end of the rotor 2 are connected together by a connecting assembly mounted on the inner side of the upper part of the power housing. The lower end of the connecting assembly has a first flow channel extending to the outer side of the lower part of the connecting assembly. The upper end of the transmission main shaft 18 has a second flow channel 21 opening upwards. The lower end of the transmission main shaft 18 has a connection between the upper end and the second flow channel. The upper end of the third flow channel is connected to the upper end. The outer side of the upper end of the output spindle 16 is axially slidably installed in the third flow channel. The outer side of the upper part of the output spindle 16 is provided with at least one outward-facing strip groove 23 at intervals along the circumference. The outer side of the lower part of the transmission spindle 18 corresponding to each strip groove 23 is provided with a radially penetrating mounting screw hole. Each mounting screw hole is screwed with an anti-drop pin 24 whose end is slidably installed in the corresponding strip groove 23. A lower bearing assembly is provided between the outer side of the lower part of the output spindle 16 and the inner side of the lower part of the power housing. An elastic reset member 17 is provided on the outer side of the upper part of the output spindle 16 corresponding to the position between the upper end of the lower bearing assembly and the lower end of the transmission spindle 18.

[0031] During use, with this configuration, when the drive spindle 18 drives the output spindle 16 to rotate, the output spindle 16 can move axially under the action of the lower bearing assembly and the elastic reset member 17. When the output spindle 16 moves downward, it can drive the drill bit installed at the lower end of the output spindle 16 to impact the formation, which can improve the rock breaking efficiency. By setting the upper bearing assembly, the wear between the drive spindle 18 and the power housing can be reduced. At the same time, it is also convenient to connect the drive spindle 18 and the rotor 2, which is convenient for subsequent maintenance. By setting the connecting assembly, the impact of the rotor 2's swing during operation on the drive spindle 18 can be reduced, making the rotation of the drive spindle 18 more stable.

[0032] Example 3: As an optimization of the above examples, as shown in the appendix. Figure 1 , 5As shown, the lower bearing assembly includes a lower TC inner sleeve 38, a lower TC outer sleeve 39, an upper impact bushing 27, a lower impact bushing 28, and a steel ball 29. A tapered mounting surface 22, smaller at the top and larger at the bottom, is provided on the lower outer side of the output spindle 16, corresponding to the position below the power housing. A lower TC inner sleeve 38, fitted onto the lower outer side of the output spindle 16, is mounted on the mounting surface 22. A lower TC outer sleeve 39, whose outer side is fixedly mounted to the inner side of the lower end of the power housing, is fitted onto the outer side of the lower TC inner sleeve 38. A locking nut 30 is fixedly mounted on the lower outer side of the output spindle 16, corresponding to the position above the lower TC inner sleeve 38. A lower impact bushing 28, fitted between the inner side of the power housing and the outer side of the output spindle 16, is fixedly mounted on the upper end of the locking nut 30. Several upward-opening lower track recesses are distributed circumferentially on the upper end of the lower impact bushing 28. The groove, the lower inner wall of the lower track groove includes a vertical surface 32, a first horizontal surface 33, an inclined surface 34 and a second horizontal surface 35 connected in sequence along the rotation direction of the rotor 2. The second horizontal surface 35 is located above the first horizontal surface 33. The second horizontal surface 35 of each lower track groove is transitionally connected to the upper end of the vertical surface 32 of the adjacent lower track groove. A steel ball 29 is installed in the lower track groove. The inner side of the power housing above the lower impact bushing 28 and the outer side of the upper impact bushing 27 are splined together. The lower end of the upper impact bushing 27 corresponding to each lower track groove position is provided with an upper track groove with an opening facing downward and the same structure as the lower track groove. The upper part of the steel ball 29 is located in the upper track groove. The elastic reset member 17 is installed between the upper end of the upper impact bushing 27 and the lower end of the transmission main shaft 18.

[0033] As required, the vertical surface 32, the first horizontal surface 33, the inclined surface 34, and the second horizontal surface 35 are all connected by rounded transitions. During use, by setting the upper TC inner sleeve 25 and the upper TC outer sleeve 26, the wear between the output spindle 16 and the power housing can be reduced, the service life of the output spindle 16 can be extended, and the failure rate and maintenance cost of the output spindle 16 can be reduced. By setting the upper impact sleeve 27 and the lower impact sleeve 28, the steel ball 29 can roll in the upper and lower track grooves during the rotation of the output spindle 16. When the steel ball 29 rolls from the first horizontal plane 33 to the second horizontal plane 35 via the inclined plane 34, the upper impact sleeve 27 moves upward between the outer side of the output spindle 16 and the inner side of the power housing. After the upper impact sleeve 27 moves upward, it squeezes the elastic reset member 17 to store energy. When the steel ball 29 rolls from the second horizontal plane 35 to the first horizontal plane 33 via the vertical plane 32, the elastic reset member 17 resets, causing the upper impact sleeve 27 to move downward quickly to impact the steel ball 29 and the lower impact sleeve 28, thereby causing the drill bit connected to the output spindle 16 to impact the formation and improve the rock breaking efficiency.

[0034] Example 4: As an optimization of the above examples, as shown in the appendix. Figure 1 , 5As shown, the upper end of the lower impact bushing 28 has 3 to 5 lower track grooves distributed along the circumference.

[0035] During use, with this setting, the lower impact sleeve 28 can move up and down 3 to 5 times as the transmission spindle 18 rotates one revolution, so that the drill bit connected to the output spindle 16 can reciprocate up and down to impact the formation in a regular manner. Alternatively, the length of the second horizontal surface 35 of each lower track groove can be different according to the requirements, so that the drill bit connected to the output spindle 16 can impact the formation randomly. The frequency of the up and down movement of the output spindle 16 can be adjusted according to the requirements.

[0036] Example 5: As an optimization of the above examples, as shown in the appendix. Figure 1 As shown, a limiting ring platform 36 is fixed on the lower outer side of the lower TC inner sleeve 38, which is located below the lower TC outer sleeve 39. An adjusting shim 37 is provided between the upper end of the elastic reset member 17 and the lower end of the transmission main shaft 18.

[0037] Depending on the requirements, the elastic reset element 17 is a known prior art, such as several disc springs stacked together. During use, by setting the limiting ring 36, separation can be prevented when the lower TC outer sleeve 39 and the lower TC inner sleeve 38 move up and down relative to each other, reducing the failure rate. By setting the adjusting shim 37, the compression of the elastic reset element 17 can be adjusted, which facilitates the storage of energy after the upper impact sleeve 27 moves upward, and can adjust the impact force released after the upper impact sleeve 27 moves downward. This force can be transmitted to the output spindle 16 and the drill bit connected to the output spindle 16 through the lower impact bearing.

[0038] Example 6: As an optimization of the above examples, as shown in the appendix. Figure 1 As shown, the upper bearing assembly includes an upper TC inner sleeve 25, an upper TC outer sleeve 26, and a thrust bearing 40. A mounting step surface 31 is provided on the lower outer side of the transmission main shaft 18 corresponding to the position above the third flow channel. A thrust bearing 40 is mounted on the mounting step surface 31, which is fitted between the outer side of the transmission main shaft 18 and the inner side of the power housing. An upper TC inner sleeve 25 is mounted on the upper end of the thrust bearing 40, which is fixedly mounted to the upper outer side of the transmission main shaft 18. An upper TC outer sleeve 26 is fitted on the outer side of the upper TC inner sleeve 25, which is fixedly mounted to the inner side of the power housing.

[0039] During use, this setting can reduce wear between the transmission spindle 18 and the power housing, extend the service life of the transmission spindle 18, and make the rotation of the transmission spindle 18 more flexible, making it easier for the transmission spindle 18 to transmit torque to the output spindle 16.

[0040] Example 7: As an optimization of the above examples, as shown in the appendix. Figure 1As shown, the connecting assembly includes a rotor joint 41, a universal coupling 42, and a drive shaft joint 43. The upper end of the rotor joint 41 is fixedly installed together with the lower end of the rotor 2. The lower end of the rotor joint 41 and the upper end of the drive shaft joint 43 are connected together by the universal coupling 42. The first flow channel includes a main flow channel 19 located at the center of the lower end of the drive shaft joint 43 and opening downwards, and a secondary flow channel 20 evenly distributed around the lower outer part of the drive shaft joint 43 and communicating with the upper part of the main flow channel 19. The lower end of the drive shaft joint 43 is fixedly installed together with the upper end of the drive shaft 18.

[0041] During use, this setting can reduce the impact of rotor 2's oscillation on the transmission spindle 18, making the rotation of the transmission spindle 18 more stable.

[0042] Example 8: As an optimization of the above examples, as shown in the appendix Figure 1 As shown, the power housing includes a connecting housing 44, a first transmission housing 45, a second transmission housing 46, and a third transmission housing 47, which are fixedly installed together from top to bottom. The upper end of the connecting housing 44 is fixedly installed together with the lower end of the rotor 2. The inner side of the upper end of the first transmission housing 45 is fixedly installed together with the outer side of the upper TC sleeve 26. The inner side of the upper part of the second transmission housing 46 is fixedly installed together with the outer side of the lower end of the transmission main shaft 18. The inner side of the upper part of the third transmission housing 47 is splinedly connected to the outer side of the upper impact bushing 27. The inner side of the lower end of the third transmission housing 47 is fixedly installed together with the outer side of the lower TC sleeve 39.

[0043] During use, this setup facilitates the connection between the connecting components, the drive spindle 18, and the output spindle 16, making maintenance more convenient.

[0044] Example 9: As an optimization of the above examples, as shown in the appendix Figure 1 , 4 As shown, an anti-drop nut 48 is fixedly installed on the outer side of the upper end of the anti-drop connecting rod 8 on the inner side of the lower end of the moving valve seat 6. An anti-drop retaining ring 49 with an outer diameter larger than the inner diameter of the anti-drop ring platform 15 is installed on the outer side of the upper part of the anti-drop screw below the anti-drop nut 48.

[0045] As required, the inner side of the lower end of the moving valve seat 6 and the outer side of the anti-drop nut 48 are both hexagonal. This allows the moving valve seat 6 and the anti-drop nut 48 to rotate synchronously, while also allowing the anti-drop nut 48 and the moving valve seat 6 to move axially relative to each other. The anti-drop nut 48 is fixedly installed to the upper end of the anti-drop connecting rod 8 via a threaded connection. During use, this design facilitates the disassembly and assembly of the anti-drop connecting rod 8, the rotor 2, and the moving valve seat 6, reducing maintenance costs.

[0046] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A composite oscillation and impact downhole power tool, characterized in that... It includes an oscillation assembly, a power assembly, an output spindle, and an impact assembly. The power assembly includes a stator and a rotor. A rotor capable of rotating through fluid or gas is installed inside the stator. An oscillation assembly capable of generating pulsed oscillation fluid is provided at the upper end of the rotor. A hollow output spindle is provided below the rotor. An impact assembly is installed between the lower end of the rotor and the output spindle. The impact assembly can cause the output spindle to reciprocate axially as the rotor rotates. The oscillation assembly includes an oscillation housing, a fixed valve seat, a fixed valve core, a moving valve seat, a moving valve core, and an anti-drop connecting rod. An anti-drop housing is fixedly mounted on the lower end of the oscillation housing, and the lower end of the anti-drop housing is fixedly mounted to the upper end of the stator. A fixed valve seat, with its lower end located on the inner side of the upper part of the anti-drop housing, is slidably mounted axially inside the oscillation housing. The upper end of the fixed valve seat has an eccentric hole that runs vertically through it. A fixed valve core is fixedly mounted on the inner side of the lower end of the eccentric hole. The upper end of the fixed valve core has an upper flow hole coaxial with the eccentric hole. An anti-drop connecting rod, with its upper end located below the fixed valve seat, is fixedly mounted on the inner side of the upper end of the rotor. The outer side of the upper end of the anti-drop connecting rod runs axially through the oscillation housing. The valve is slidably mounted on the inner side of the lower part of the moving valve seat. The upper center of the moving valve seat has a first mounting groove with an upward opening. Several drain holes with their upper ends communicating with the first mounting groove are evenly distributed along the circumference on the outer side of the lower part of the moving valve seat. A moving valve core with its upper end in contact with the lower end of the fixed valve core is fixedly mounted on the inner side of the upper end of the first mounting groove above the drain hole. The upper end of the moving valve core has a lower flow hole that runs through the upper and lower parts. When the moving valve core rotates, the overlapping area of ​​the lower flow hole and the upper flow hole projected on the horizontal plane can periodically increase and decrease. An anti-drop ring platform is fixed on the inner side of the lower part of the anti-drop housing. Through the rotor and stator, drilling fluid enters the stator, driving the rotor to rotate, which in turn drives the drill bit mounted at the lower end of the output spindle to rotate. When the rotor rotates, it drives the anti-drop linkage to rotate, which in turn drives the moving valve seat and the moving valve core to rotate. After the moving valve core rotates, it can change the connection area between the lower and upper flow holes. When the overlapping area of ​​the lower and upper flow holes projected onto the horizontal plane is the largest, the pressure of the fluid decreases when passing through the lower flow hole; when the overlapping area of ​​the lower and upper flow holes projected onto the horizontal plane is the smallest, the pressure of the fluid increases when passing through the lower flow hole. Thus, a pressure difference exists after the fluid flows through the lower flow hole, which eventually forms a pulse oscillation. At the same time, it drives the anti-drop linkage to move downward with high frequency and low amplitude, which in turn drives the output spindle to move downward with high frequency and low amplitude.

2. The oscillation-impact composite downhole power tool according to claim 1, characterized in that... The impact assembly includes a connecting assembly, an upper bearing assembly, a lower bearing assembly, an elastic reset component, and a power housing. The lower end of the stator and the upper end of the power housing are fixedly mounted together. A drive shaft is coaxially mounted inside the power housing. An upper bearing assembly is installed between the outer side of the drive shaft and the inner side of the power housing. The upper end of the drive shaft and the lower end of the rotor are connected by a connecting assembly mounted on the inner side of the upper part of the power housing. The lower end of the connecting assembly has a first flow channel extending to the outer side of the lower part of the connecting assembly, and the upper end of the drive shaft has a second flow channel opening upwards. The lower end of the drive shaft has a second flow channel with its upper end connecting to the second flow channel. The upper end of the flow channel is connected to the third flow channel. The outer side of the upper end of the output spindle is axially slidably installed in the third flow channel. The outer side of the upper part of the output spindle is provided with at least one outward-facing slot along the circumference. The outer side of the lower part of the transmission spindle corresponding to each slot is provided with a radially penetrating mounting screw hole. Each mounting screw hole is screwed with an anti-drop pin whose end is slidably installed in the corresponding slot. A lower bearing assembly is provided between the outer side of the lower part of the output spindle and the inner side of the lower part of the power housing. An elastic reset member is provided on the outer side of the upper part of the output spindle corresponding to the position between the upper end of the lower bearing assembly and the lower end of the transmission spindle.

3. The oscillation-impact composite downhole power tool according to claim 2, characterized in that... The lower bearing assembly includes a lower TC inner sleeve, a lower TC outer sleeve, an upper impact bushing, a lower impact bushing, and steel balls. A tapered mounting surface, smaller at the top and larger at the bottom, is located on the outer side of the lower part of the output spindle, corresponding to the position below the power housing. A lower TC inner sleeve is fitted onto the mounting surface and is fitted with a lower TC outer sleeve, whose outer side is fixedly mounted to the inner side of the lower end of the power housing. A locking nut is fixedly mounted on the outer side of the lower part of the output spindle, corresponding to the position above the lower TC inner sleeve. A lower impact bushing, fitted between the inner side of the power housing and the outer side of the output spindle, is fixedly mounted on the upper end of the locking nut. Several upward-opening lower track grooves are distributed circumferentially on the upper end of the lower impact bushing. The lower inner wall of the lower track grooves includes a vertical surface, a first horizontal surface, an inclined surface, and a second horizontal surface connected sequentially along the rotor rotation direction. The second horizontal plane is located above the first horizontal plane. The second horizontal plane of each lower track groove is connected to the upper end of the vertical plane of the adjacent lower track groove. A steel ball is installed in the lower track groove. The inner side of the power housing above the lower impact bushing and the outer side of the upper impact bushing are splined together. The lower end of the upper impact bushing corresponding to each lower track groove position is provided with an upper track groove with an opening facing downward and the same structure as the lower track groove. The upper part of the steel ball is located in the upper track groove. The elastic reset member is installed between the upper end of the upper impact bushing and the lower end of the transmission main shaft. Or / and, the upper end of the lower impact bushing has 3 to 5 lower track grooves distributed along the circumference. Or / and, the lower outer side of the lower TC inner sleeve below the lower TC outer sleeve is fixed with a limit ring platform. An adjustment shim is provided between the upper end of the elastic reset member and the lower end of the transmission main shaft.

4. The oscillation-impact composite downhole power tool according to claim 2 or 3, characterized in that... The upper bearing assembly includes an upper TC inner sleeve, an upper TC outer sleeve, and a thrust bearing. A mounting step surface is provided on the lower outer side of the transmission main shaft corresponding to the position above the third flow channel. A thrust bearing is installed on the mounting step surface, which is fitted between the outer side of the transmission main shaft and the inner side of the power housing. An upper TC inner sleeve is installed on the upper end of the thrust bearing, with its inner side fixedly installed together with the upper outer side of the transmission main shaft. An upper TC outer sleeve is fitted on the outer side of the upper TC inner sleeve, with its outer side fixedly installed together with the inner side of the power housing.

5. The oscillation-impact composite downhole power tool according to claim 2 or 3, characterized in that... The connecting components include a rotor joint, a universal coupling, and a drive shaft joint. The upper end of the rotor joint is fixedly installed together with the lower end of the rotor. The lower end of the rotor joint and the upper end of the drive shaft joint are connected together by a universal coupling. The first flow channel includes a main flow channel located at the center of the lower end of the drive shaft joint and opening downwards, and secondary flow channels evenly distributed around the lower outer part of the drive shaft joint and communicating with the upper part of the main flow channel. The lower end of the drive shaft joint is fixedly installed together with the upper end of the drive shaft.

6. The oscillation-impact composite downhole power tool according to claim 4, characterized in that... The connecting components include a rotor joint, a universal coupling, and a drive shaft joint. The upper end of the rotor joint is fixedly installed together with the lower end of the rotor. The lower end of the rotor joint and the upper end of the drive shaft joint are connected together by a universal coupling. The first flow channel includes a main flow channel located at the center of the lower end of the drive shaft joint and opening downwards, and secondary flow channels evenly distributed around the lower outer part of the drive shaft joint and communicating with the upper part of the main flow channel. The lower end of the drive shaft joint is fixedly installed together with the upper end of the drive shaft.

7. The oscillation-impact composite downhole power tool according to claim 5, characterized in that... The power housing includes a connecting housing, a first transmission housing, a second transmission housing, and a third transmission housing, which are fixedly installed together from top to bottom. The upper end of the connecting housing is fixedly installed together with the lower end of the rotor. The inner side of the upper end of the first transmission housing is fixedly installed together with the outer side of the upper TC sleeve. The inner side of the upper part of the second transmission housing is fixedly installed together with the outer side of the lower end of the transmission main shaft. The inner side of the upper part of the third transmission housing is splinedly connected to the outer side of the upper impact shaft sleeve. The inner side of the lower end of the third transmission housing is fixedly installed together with the outer side of the lower TC sleeve.

8. The oscillation-impact composite downhole power tool according to claim 6, characterized in that... The power housing includes a connecting housing, a first transmission housing, a second transmission housing, and a third transmission housing, which are fixedly installed together from top to bottom. The upper end of the connecting housing is fixedly installed together with the lower end of the rotor. The inner side of the upper end of the first transmission housing is fixedly installed together with the outer side of the upper TC sleeve. The inner side of the upper part of the second transmission housing is fixedly installed together with the outer side of the lower end of the transmission main shaft. The inner side of the upper part of the third transmission housing is splinedly connected to the outer side of the upper impact shaft sleeve. The inner side of the lower end of the third transmission housing is fixedly installed together with the outer side of the lower TC sleeve.

9. The oscillation-impact composite downhole power tool according to claim 1, 2, 3, 6, 7, or 8, characterized in that... An anti-drop nut, which is fixedly installed on the outer side of the upper end of the anti-drop connecting rod, is fitted on the inner side of the lower end of the moving valve seat. An anti-drop retaining ring with an outer diameter larger than the inner diameter of the anti-drop ring is installed on the outer side of the upper part of the anti-drop screw below the anti-drop nut.

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