Oscillating and impacting combined underground power tool

Abstract

The invention relates to the technical field of well drilling, in particular to an oscillation and impact composite downhole power tool which comprises an oscillation assembly, a power assembly, an output spindle and an impact assembly, the power assembly comprises a stator and a rotor, and the rotor capable of rotating through fluid or gas is installed in the stator. According to the invention, the structure is reasonable and compact, the oscillation assembly is arranged and can form pulse oscillation fluid on the upper part of the power assembly, so that a drill column is driven to creep downwards at high frequency and low amplitude, and when the rotor rotates, the impact assembly can enable the output main shaft to rotate along with the rotor and enable the output main shaft to reciprocate along the axial direction; in this way, impact force generated when the output main shaft reciprocates in the axial direction can be transmitted to a drill bit installed at the lower end of the output main shaft, and rock breaking efficiency is improved. Under the combined action of oscillation and impact, the problems of low deflecting rate, low drilling efficiency and low drilling speed of large-size borehole deflecting sections of directional wells and horizontal wells can be effectively solved, and the aims of increasing the speed and improving the efficiency are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of drilling, and is an oscillation impact composite downhole power tool. Background Art

[0002] In large-sized wells, there is a large gap between the drill string and the wellbore, the hydraulic parameters are insufficient, the bottom hole cleaning, sand carrying capacity and rock breaking capacity are insufficient, the friction between the drill string and the well wall is large, it is easy to support pressure, and the slope rate is low, which affects the directional efficiency and mechanical drilling speed. In order to solve the directional support pressure problem, at present, there are many vibration drag reduction tools with relatively good application effects and large scale in China, with different structures and characteristics, but there is a lack of drag reduction tools for directional drilling of large-sized wells of 311mm and above. It is necessary to develop relevant large-sized wellbore friction and drag reduction tools, and match them with directional drilling tools to improve the directional drilling speed of large-sized wells. Summary of the invention

[0003] The present invention provides an oscillating impact composite downhole power tool, which overcomes the above-mentioned deficiencies of the prior art and can effectively solve the problems of easy pressure support, low inclination rate and low drilling speed in existing large-size wellbore directional drilling.

[0004] The technical solution of the present invention is achieved through the following measures: an oscillation-impact composite downhole power tool, including an oscillation assembly, a power assembly, an output spindle and an impact assembly, the power assembly including a stator and a rotor, a rotor that can rotate when passing through a fluid or a gas is installed in the stator, an oscillation assembly that can form a pulse oscillation fluid is provided at the upper end of the rotor, a hollow output spindle is provided under the rotor, and an impact assembly is installed between the lower end of the rotor and the upper end of the output spindle, the impact assembly can make the output spindle rotate with the rotor and make the output spindle reciprocate along the axial direction.

[0005] The following are further optimizations and / or improvements to the above technical solutions: The above-mentioned oscillation assembly may include an oscillation housing, a fixed valve seat, a fixed valve core, a movable valve seat, a movable valve core and an anti-drop connecting rod. The 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 a lower end located on the inner side of the upper part of the anti-drop housing is axially slidably installed on the inner side of the oscillation housing. An eccentric hole that passes through the upper end of the fixed valve seat is provided. 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 an upper end located below the fixed valve seat is fixedly installed on the inner side of the upper end of the rotor. It is axially slidably installed on the inner side of the lower part of the movable valve seat, and a first installation groove opening upward is provided in the center of the upper end of the movable valve seat. A number of drainage holes whose upper ends are interconnected with the first installation groove are evenly distributed along the circumference on the outer side of the lower part of the movable valve seat. A movable valve core whose upper end contacts with the lower end of the fixed valve core is fixedly installed on the inner side of the upper end of the first installation groove corresponding to the position above the drainage hole, and a lower flow hole that passes through the upper and lower ends is provided on the upper end of the movable valve core. When the movable valve core rotates, the overlapping area of ​​the lower flow hole and the projection of the upper flow hole on the horizontal plane can periodically increase and decrease, and an anti-drop ring is fixed to the inner side of the lower part of the anti-drop shell.

[0006] The impact assembly may include a connecting component, an upper bearing component, a lower bearing component, 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 transmission main shaft is coaxially sleeved in the power housing. An upper bearing component is installed between the outer side of the transmission main shaft and the inner side of the power housing. The upper end of the transmission main shaft and the lower end of the rotor are connected together by a connecting component sleeved on the inner side of the upper part of the power housing. The lower end of the connecting component is provided with a first flow channel whose upper end extends to the outer side of the lower part of the connecting component. The upper end of the transmission main shaft is provided with a second flow channel opening upward. The lower end of the transmission main shaft is provided with an upper end and a The upper end of the second flow channel is connected to the third flow channel, the outer side of the upper end of the output main shaft is axially slidably installed in the third flow channel, the outer side of the upper part of the output main shaft is circumferentially provided with at least one strip groove opening outward, and the outer side of the lower part of the transmission main shaft corresponding to each strip groove position is provided with a radially penetrating mounting screw hole, and each mounting screw hole is threaded with an anti-drop pin whose end is slidably installed in the corresponding strip groove, a lower bearing assembly is provided between the outer side of the lower part of the output main shaft and the inner side of the lower part of the power housing, and an elastic reset piece is provided on the outer side of the upper part of the output main shaft at a position between the upper end of the lower bearing assembly and the lower end of the transmission main shaft.

[0007] The above-mentioned lower bearing assembly may include a lower TC inner sleeve, a lower TC outer sleeve, an upper impact sleeve, a lower impact sleeve and a steel ball. A conical mounting surface with a small upper part and a large lower part is provided on the outer side of the lower part of the output main shaft corresponding to the position below the power housing. The mounting surface is provided with a lower TC inner sleeve sleeved on the outer side of the lower part of the output main shaft. The outer side of the lower TC inner sleeve is sleeved with a lower TC outer sleeve which is fixedly mounted with the outer side and 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 main shaft corresponding to the upper end position of the lower TC inner sleeve. A lower impact sleeve sleeved between the inner side of the power housing and the outer side of the output main shaft is fixedly mounted on the upper end of the locking nut. A plurality of lower track grooves with openings facing upward are distributed along the circumference of the upper end of the lower impact sleeve. The inner wall of the lower side of the track groove includes a vertical surface, a first horizontal surface, an inclined surface and a second horizontal surface which are connected in sequence along the rotation direction of the rotor. 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 lower track groove at the adjacent position. A steel ball is installed in the lower track groove. The inner side of the power casing corresponding to the position above the lower impact sleeve and the outer side of the upper impact sleeve are spline-connected together. The lower end of the upper impact sleeve corresponding to each lower track groove position is provided with an upper track groove which 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, and the elastic reset part is installed between the upper end of the upper impact sleeve and the lower end of the transmission main shaft.

[0008] The upper end of the lower impact sleeve may be provided with 3 to 5 lower track grooves distributed along the circumference.

[0009] A limiting ring table can be fixed on the outer side of the lower part of the lower TC inner sleeve corresponding to the position below the lower TC outer sleeve, and an adjusting gasket is arranged between the upper end of the elastic reset member and the lower end of the transmission main shaft.

[0010] The above-mentioned upper bearing assembly may include an upper TC inner sleeve, an upper TC outer sleeve and a thrust bearing. An installation step surface is provided on the outer side of the lower part of the transmission main shaft corresponding to the position above the third flow channel. A thrust bearing sleeved between the outer side of the transmission main shaft and the inner side of the power housing is installed on the installation step surface. An upper TC inner sleeve whose inner side is fixedly installed with the outer side of the upper part of the transmission main shaft is installed on the upper end of the thrust bearing. An upper TC outer sleeve whose outer side is fixedly installed with the inner side of the power housing is sleeved on the outer side of the upper TC inner sleeve.

[0011] The above-mentioned connecting assembly may include a rotor joint, a universal coupling and a transmission shaft joint. The upper end of the rotor joint is fixedly mounted together with the lower end of the rotor, and the lower end of the rotor joint is connected to the upper end of the transmission shaft joint through a universal coupling. The first flow channel includes a main flow channel which is arranged at the center of the lower end of the transmission shaft joint and opens downward, and a secondary flow channel which is evenly distributed along the circumference on the outer side of the lower part of the transmission shaft joint and connected to the upper part of the main flow channel. The lower end of the transmission shaft joint is fixedly mounted together with the upper end of the transmission main shaft.

[0012] The above-mentioned power casing may include a connecting casing, a first transmission casing, a second transmission casing and a third transmission casing fixedly installed together from top to bottom in sequence, the upper end of the connecting casing is fixedly installed together with the lower end of the rotor, the inner side of the upper end of the first transmission casing is fixedly installed together with the outer side of the upper TC sleeve, the inner side of the upper part of the second transmission casing 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 casing is spline-connected with the outer side of the upper impact sleeve, and the inner side of the lower end of the third transmission casing is fixedly installed together with the outer side of the lower TC sleeve.

[0013] The inner side of the lower end of the above-mentioned movable valve seat can be equipped with an anti-drop nut fixedly installed on the outer side of the upper end of the anti-drop connecting rod, and 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 corresponding to the position below the anti-drop nut.

[0014] The structure of the present invention is reasonable and compact. By setting an oscillation assembly, the oscillation assembly can form a pulse 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 rotates, the impact assembly can make the output spindle rotate with the rotor and make the output spindle reciprocate axially, so that the impact force of the axial reciprocating movement of the output spindle can be transmitted to the drill bit installed at the lower end of the output spindle, thereby improving the rock breaking efficiency. Under the combined action of oscillation and impact, the problems of low deflection rate, low drilling efficiency and slow drilling speed in the large-size wellbore deflection section of directional wells and horizontal wells can be effectively solved, achieving the goal of increasing speed and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attached Figure 1 It is a schematic diagram of the front cross-sectional structure of the first embodiment.

[0016] Attached Figure 2 It is a schematic diagram of the top cross-sectional structure of the fixed valve core in the first embodiment.

[0017] Attached Figure 3 It is a schematic diagram of the top cross-sectional structure of the movable valve core in the first embodiment.

[0018] Attached Figure 4 It is a schematic diagram of the front cross-sectional structure of the movable valve seat in the first embodiment.

[0019] Attached Figure 5 It is a schematic diagram of the expansion of the lower track groove in the third embodiment.

[0020] The codes in the accompanying drawings are: 1 is the stator, 2 is the rotor, 3 is the oscillation housing, 4 is the fixed valve seat, 5 is the fixed valve core, 6 is the moving valve seat, 7 is the moving valve core, 8 is the anti-drop connecting rod, 9 is the anti-drop housing, 10 is the eccentric hole, 11 is the upper flow hole, 12 is the first installation groove, 13 is the drainage hole, 14 is the lower flow hole, 15 is the anti-drop ring stage, 16 is the output spindle, 17 is the elastic reset member, 18 is the transmission spindle, 19 is the main flow channel, 20 is the secondary flow channel, 21 is the second flow channel, 22 is the installation surface, 23 is the strip groove, 24 is the anti-drop pin, 25 is the upper TC inner sleeve, 26 is the upper TC outer sleeve. 1 is a sleeve, 27 is an upper impact sleeve, 28 is a lower impact sleeve, 29 is a steel ball, 30 is a locking nut, 31 is a mounting step surface, 32 is a vertical surface, 33 is a first horizontal surface, 34 is an inclined surface, 35 is a second horizontal surface, 36 is a limit ring, 37 is an adjustment gasket, 38 is a lower TC inner sleeve, 39 is a lower TC outer sleeve, 40 is a thrust bearing, 41 is a rotor joint, 42 is a universal coupling, 43 is a transmission shaft joint, 44 is a connecting housing, 45 is a first transmission housing, 46 is a second transmission housing, 47 is a third transmission housing, 48 is an anti-drop nut, and 49 is an anti-drop retaining ring. DETAILED DESCRIPTION

[0021] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0022] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0023] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As shown in the attached Figures 1 to 4As shown, the 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. A rotor 2 that can rotate when passing through a fluid or gas is installed in the stator 1. An oscillation assembly that can form a pulse oscillation fluid is provided at the upper end of the rotor 2. The oscillation assembly includes an oscillation housing 3, a fixed valve seat 4, a fixed valve core 5, a movable valve seat 6, a movable 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 whose lower end is located on the inner side of the upper part of the anti-drop housing 9 is axially slidably installed on the inner side of the oscillation housing 3. An eccentric hole 10 that passes through the upper and lower ends of the fixed valve seat 4 is provided on the upper end. A fixed valve core 5 is fixedly installed on the inner side of the lower end of the eccentric hole 10. An upper flow hole 11 coaxial with the eccentric hole 10 is provided on the upper end of the fixed valve core 5. An anti-drop connecting rod 8 whose upper end is located below the fixed valve seat 4 is fixedly installed on the inner side of the upper end of the rotor 2. The outer side of the upper end of the anti-drop connecting rod 8 is axially slidably installed on the inner side of the lower part of the moving valve seat 6. The center of the upper end of the moving valve seat 6 is provided with a first installation groove 12 opening upward. The outer side of the lower part of the moving valve seat 6 is evenly distributed along the circumference with a plurality of drainage holes 13 whose upper ends are interconnected with the first installation groove 12. The inner side of the upper end of the first installation groove 12 corresponding to the position above the drainage hole 13 is fixedly installed with a moving valve core 7 whose upper end is in contact with the lower end of the fixed valve core 5. The upper end of the moving valve core 7 is provided with a lower flow hole 14 that passes through from top to bottom. When the lower flow hole 14 rotates with the moving valve core 7, the overlapping area of ​​the projection of the upper flow hole 11 on the horizontal plane can be periodically increased and decreased. An anti-drop ring 15 is fixed to the inner side of the lower part of the anti-drop shell 9. A hollow output main shaft 16 is provided below the rotor 2. An impact assembly is installed between the rotor 2 and the upper end of the output main shaft 16. The impact assembly can make the output main shaft 16 rotate with the rotor 2 and make the output main shaft 16 reciprocate along the axial direction.

[0024] According to the requirements, the cross-section of the inner side of the lower part of the oscillation housing 3 and the outer contour of the fixed valve seat 4 are both regular hexagons, so that the fixed valve seat 4 can move up and down in the oscillation housing 3, and the fixed valve seat 4 and the oscillation housing 3 can rotate synchronously. The outer side of the fixed valve core 5 and the inner side of the fixed valve seat 4, 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 material of the fixed valve core 5 and the moving valve core 7 are both alloy materials. This can not only improve the erosion resistance of the moving valve seat 6 and the fixed valve seat 4 and extend the 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 is convenient for the replacement of fixed valve cores 5 and moving valve cores 7 of various specifications. The lower end of the anti-drop connecting rod 8 is fixedly installed with the upper end of the rotor 2 through a threaded connection. The powertrain is an existing well-known technology. The rotor 2 can be an existing well-known turbine rotor. The inner diameter of the anti-drop ring 15 is smaller than the outer diameter of the upper end of the anti-drop connecting rod 8.

[0025] During use, the drilling fluid flows through the oscillation housing 3 and enters the stator 1 through the rotor 2 and the stator 1, which can drive the rotor 2 to rotate, thereby driving the drill bit installed at the lower end of the output spindle 16 to rotate. When the rotor 2 rotates, it drives the anti-drop connecting rod 8 to rotate, thereby driving the movable valve seat 6 and the movable valve core 7 to rotate. After the movable valve core 7 rotates, it can cover the communicating area of ​​the lower flow hole 14 and the upper flow hole 11 of the cover plate. When the communicating area of ​​the lower flow hole 14 and the upper flow hole 11 is the largest, that is, the lower flow hole 14 and the upper flow hole 11 are at When the overlapping area of ​​the projections on the horizontal plane is the largest, the pressure of the fluid decreases when passing through the lower flow hole 14; when the connecting area between the lower flow hole 14 and the upper flow hole 11 is the smallest, that is, when the overlapping area of ​​the projections of the lower flow hole 14 and the upper flow hole 11 on the horizontal plane is the smallest, the pressure of the fluid increases when passing through the lower flow hole 14. In this way, there is a pressure difference after the fluid flows through the lower flow hole 14, and finally a pulse oscillation is formed, which drives the anti-drop connecting rod to creep downward at a high frequency and a low amplitude, and finally drives the output main shaft to creep downward at a high frequency and a low amplitude, thereby alleviating the support pressure problem.

[0026] The rotor 2 of the present application can rotate when fluid or gas passes through, which can save energy. By setting an oscillation assembly, the oscillation assembly can form a pulse 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, so that the impact force of the axial reciprocating movement of the output spindle 16 can be transmitted to the drill bit installed at the lower end of the output spindle 16, thereby improving the rock breaking efficiency. Under the combined action of oscillation and impact, the problems of low inclination rate, low drilling efficiency and slow drilling speed in the large-size wellbore inclination section of directional wells and horizontal wells can be effectively solved, achieving the goal of increasing speed and efficiency.

[0027] The above-mentioned oscillation impact composite downhole power tool can be further optimized and / or improved according to actual needs: Embodiment 2: As an optimization of the above embodiment, as shown in the attached Figure 1As shown, the impact assembly includes a connecting component, an upper bearing component, a lower bearing component, 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 installed together. A transmission main shaft 18 is coaxially sleeved in the power housing. An upper bearing component 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 component sleeved on the inner side of the upper part of the power housing. The lower end of the connecting component is provided with a first flow channel whose upper end extends to the outer side of the lower part of the connecting component. The upper end of the transmission main shaft 18 is provided with a second flow channel 21 opening upward. The lower end of the transmission main shaft 18 is provided with an upper end and the second flow channel 21, the outer side of the upper end of the output main shaft 16 is axially slidably installed in the third flow channel, the outer side of the upper part of the output main shaft 16 is circumferentially provided with at least one strip groove 23 opening outward, and the outer side of the lower part of the transmission main shaft 18 corresponding to the position of each strip groove 23 is provided with a radially penetrating mounting screw hole, and each mounting screw hole is threaded 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 main shaft 16 and the inner side of the lower part of the power housing, and an elastic reset member 17 is provided on the outer side of the upper part of the output main shaft 16 corresponding to the position between the upper end of the lower bearing assembly and the lower end of the transmission main shaft 18.

[0028] During use, through such an arrangement, when the transmission main shaft 18 drives the output main shaft 16 to rotate, the output main shaft 16 can move axially under the action of the lower bearing assembly and the elastic reset member 17. When the output main shaft 16 moves downward, it can drive the drill bit installed at the lower end of the output main shaft 16 to impact the formation, which can improve the rock breaking efficiency. By setting the upper bearing assembly, the wear between the transmission main shaft 18 and the power casing can be reduced. At the same time, it is also convenient for the connection between the transmission main shaft 18 and the rotor 2, which is convenient for subsequent maintenance. By setting the connecting assembly, the influence of the swing of the rotor 2 during operation on the transmission main shaft 18 can be reduced, so that the rotation of the transmission main shaft 18 is more stable.

[0029] Embodiment 3: As an optimization of the above embodiment, as shown in the attached Figure 1 , 5As shown, the lower bearing assembly includes a lower TC inner sleeve 38, a lower TC outer sleeve 39, an upper impact sleeve 27, a lower impact sleeve 28 and a steel ball 29. A conical mounting surface 22 with a small upper part and a large lower part is provided on the outer side of the lower part of the output main shaft 16 corresponding to the position below the power housing. The mounting surface 22 is provided with a lower TC inner sleeve 38 sleeved on the outer side of the lower part of the output main shaft 16. The outer side of the lower TC inner sleeve 38 is sleeved with a lower TC outer sleeve 39 fixedly mounted on the outer side and the inner side of the lower end of the power housing. A locking nut 30 is fixedly mounted on the outer side of the lower part of the output main shaft 16 corresponding to the upper end position of the lower TC inner sleeve 38. The upper end of the locking nut 30 is fixedly mounted with a lower impact sleeve 28 sleeved between the inner side of the power housing and the outer side of the output main shaft 16. The upper end of the lower impact sleeve 28 is provided with a plurality of lower track recesses with openings upward distributed along the circumference. The groove, the inner wall of the lower side 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 which are connected in sequence along the rotation direction of the rotor 2, the second horizontal surface 35 is located above the first horizontal surface 33, and the second horizontal surface 35 of each lower track groove is transitionally connected with the upper end of the vertical surface 32 of the lower track groove at the adjacent position, and a steel ball 29 is installed in the lower track groove, and the inner side of the power housing corresponding to the position above the lower impact sleeve 28 and the outer side of the upper impact sleeve 27 are spline-connected together, and the lower end of the upper impact sleeve 27 corresponding to each lower track groove position is provided with an upper track groove with an opening 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, and the elastic reset member 17 is installed between the upper end of the upper impact sleeve 27 and the lower end of the transmission main shaft 18.

[0030] According to requirements, the vertical surface 32 , the first horizontal surface 33 , the inclined surface 34 and the second horizontal surface 35 are all formed into arc transitions. During use, by arranging 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 slowed down, 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 arranging the upper impact sleeve 27 and the lower impact sleeve 28, during the rotation of the output spindle 16, the steel ball 29 can roll in the upper track groove and the lower track groove. 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 is reset to cause the upper impact sleeve 27 to quickly move downward to impact the steel ball 29 and the lower impact sleeve 28, so that the drill bit connected to the output spindle 16 impacts the formation, thereby improving the rock breaking efficiency.

[0031] Embodiment 4: As an optimization of the above embodiment, as shown in the attached Figure 1 , 5As shown, the upper end of the lower impact sleeve 28 is provided with 3 to 5 lower track grooves distributed along the circumference.

[0032] During use, through such an arrangement, the lower impact sleeve 28 can reciprocate up and down 3 to 5 times as the transmission main shaft 18 rotates one circle, so that the drill bit connected to the output main shaft 16 can reciprocate up and down to impact the formation in a regular manner. The length of the second horizontal surface 35 of each lower track groove can be different as needed, so that the drill bit connected to the output main shaft 16 can impact the formation in a disorderly manner, and the frequency of the up and down movement of the output main shaft 16 can be adjusted as needed.

[0033] Embodiment 5: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, a limiting ring 36 is fixed to the outer side of the lower part of the lower TC inner sleeve 38 corresponding to the position below the lower TC outer sleeve 39, and an adjusting gasket 37 is provided between the upper end of the elastic reset member 17 and the lower end of the transmission main shaft 18.

[0034] According to the requirements, the elastic reset member 17 is a known technology, such as a plurality of disc springs stacked in sequence. During use, by setting the limit ring 36, the lower TC outer sleeve 39 and the lower TC inner sleeve 38 can be prevented from separating when they move up and down relative to each other, thereby reducing the failure rate. By setting the adjustment gasket 37, the compression amount of the elastic reset member 17 can be adjusted, so that the upper impact sleeve 27 can store energy after moving up, and the impact force released after the upper impact sleeve 27 moves down can be adjusted, which can be transmitted to the output spindle 16 and the drill bit connected to the output spindle 16 through the lower impact bearing.

[0035] Embodiment 6: As an optimization of the above embodiment, as shown in the attached 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 outer side of the lower portion of the transmission main shaft 18 corresponding to the position above the third flow channel. The mounting step surface 31 is provided with a thrust bearing 40 sleeved between the outer side of the transmission main shaft 18 and the inner side of the power housing. The upper end of the thrust bearing 40 is provided with an upper TC inner sleeve 25 whose inner side is fixedly mounted to the outer side of the upper portion of the transmission main shaft 18. The outer side of the upper TC inner sleeve 25 is sleeved with an upper TC outer sleeve 26 whose outer side is fixedly mounted to the inner side of the power housing.

[0036] During use, such a configuration can reduce the wear between the transmission main shaft 18 and the power housing, extend the service life of the transmission main shaft 18 , and make the rotation of the transmission main shaft 18 more flexible, thereby facilitating the transmission main shaft 18 to transmit torque to the output main shaft 16 .

[0037] Embodiment 7: As an optimization of the above embodiment, as shown in the attached Figure 1As shown, the connection assembly includes a rotor joint 41, a universal coupling 42 and a transmission shaft joint 43. The upper end of the rotor joint 41 is fixedly mounted together with the lower end of the rotor 2, and the lower end of the rotor joint 41 and the upper end of the transmission shaft joint 43 are transmission-connected together through the universal coupling 42. The first flow channel includes a main flow channel 19 which is arranged at the center of the lower end of the transmission shaft joint 43 and opens downward, and a secondary flow channel 20 which is evenly distributed along the circumference on the outer side of the lower part of the transmission shaft joint 43 and connected to the upper part of the main flow channel 19. The lower end of the transmission shaft joint 43 is fixedly mounted together with the upper end of the transmission main shaft 18.

[0038] During use, such an arrangement can reduce the influence of the swing of the rotor 2 during operation on the transmission main shaft 18, making the rotation of the transmission main shaft 18 more stable.

[0039] Embodiment 8: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, the power housing includes a connecting shell 44, a first transmission shell 45, a second transmission shell 46 and a third transmission shell 47 which are fixedly installed together from top to bottom in sequence. The upper end of the connecting shell 44 is fixedly installed together with the lower end of the rotor 2, the inner side of the upper end of the first transmission shell 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 shell 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 shell 47 is spline-connected with the outer side of the upper impact sleeve 27, and the inner side of the lower end of the third transmission shell 47 is fixedly installed together with the outer side of the lower TC sleeve 39.

[0040] During use, such an arrangement facilitates the connection between the connection assembly, the transmission spindle 18 and the output spindle 16, and makes maintenance more convenient.

[0041] Embodiment 9: As an optimization of the above embodiment, as shown in the attached Figure 1 , 4 As shown, the inner side of the lower end of the moving valve seat 6 is provided with an anti-drop nut 48 fixedly installed on the outer side of the upper end of the anti-drop connecting rod 8, and the outer side of the upper part of the anti-drop screw rod corresponding to the position below the anti-drop nut 48 is provided with an anti-drop retaining ring 49 whose outer diameter is larger than the inner diameter of the anti-drop ring 15.

[0042] According to the requirements, the inner side of the lower end of the movable valve seat 6 and the outer side of the anti-drop nut 48 are both regular hexagons, so that the movable valve seat 6 and the anti-drop nut 48 can rotate synchronously, and at the same time, the anti-drop nut 48 and the movable valve seat 6 can be allowed to move axially relative to each other. The anti-drop nut 48 is fixedly installed with the upper end of the anti-drop connecting rod 8 through a threaded connection. In the process of use, through such a setting, the disassembly and assembly between the anti-drop connecting rod 8 and the rotor 2 and the movable valve seat 6 are facilitated, and the maintenance cost is reduced.

[0043] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. An oscillating impact composite downhole power tool, characterized in that The invention comprises an oscillation assembly, a power assembly, an output spindle and an impact assembly. The power assembly comprises a stator and a rotor. A rotor which can rotate when passing through a fluid or a gas is installed in the stator. An oscillation assembly which can form a pulse 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 upper end of the output spindle. The impact assembly can make the output spindle rotate with the rotor and make the output spindle reciprocate along the axial direction.

2. The oscillation impact composite downhole power tool according to claim 1, characterized in that The oscillation assembly includes an oscillation housing, a fixed valve seat, a fixed valve core, a movable valve seat, a movable valve core and an anti-drop connecting rod. The 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 with 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 axially slidably installed on the inner side of the oscillation housing. An eccentric hole penetrating up and down is provided on the upper end of the fixed valve seat, 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, and the outer side of the upper end of the anti-drop connecting rod slides along the axis The slidable installation is arranged on the inner side of the lower part of the movable valve seat, and a first installation groove opening upward is arranged in the center of the upper end of the movable valve seat. A plurality of drainage holes whose upper ends are interconnected with the first installation groove are evenly distributed along the circumference on the outer side of the lower part of the movable valve seat. A movable valve core whose upper end contacts with the lower end of the fixed valve core is fixedly installed on the inner side of the upper end of the first installation groove corresponding to the position above the drainage hole. A lower flow hole which passes through from top to bottom is arranged on the upper end of the movable valve core. When the movable valve core rotates, the overlapping area of ​​the lower flow hole and the projection of the upper flow hole on the horizontal plane can be periodically increased and decreased, and an anti-drop ring is fixed on the inner side of the lower part of the anti-drop shell.

3. The oscillation impact composite downhole power tool according to claim 2, characterized in that The impact assembly includes a connecting component, an upper bearing component, a lower bearing component, an elastic reset component and a power housing. The lower end of the stator and the upper end of the power housing are fixedly installed together. A transmission main shaft is coaxially sleeved in the power housing. An upper bearing component is installed between the outer side of the transmission main shaft and the inner side of the power housing. The upper end of the transmission main shaft and the lower end of the rotor are connected together by a connecting component sleeved on the inner side of the upper part of the power housing. The lower end of the connecting component is provided with a first flow channel extending from the upper end to the outer side of the lower part of the connecting component. The upper end of the transmission main shaft is provided with a second flow channel opening upward. The lower end of the transmission main shaft is provided with an upper end and a second flow channel opening upward. The upper end of the flow channel is connected to the third flow channel, the outer side of the upper end of the output main shaft is axially slidably installed in the third flow channel, the outer side of the upper part of the output main shaft is circumferentially provided with at least one strip groove opening outward, and the outer side of the lower part of the transmission main shaft corresponding to each strip groove position is provided with a radially penetrating mounting screw hole, and each mounting screw hole is threaded with an anti-drop pin whose end is slidably installed in the corresponding strip groove, a lower bearing assembly is provided between the outer side of the lower part of the output main shaft and the inner side of the lower part of the power housing, and an elastic reset piece is provided on the outer side of the upper part of the output main shaft corresponding to the position between the upper end of the lower bearing assembly and the lower end of the transmission main shaft.

4. The oscillation impact composite downhole power tool according to claim 3, characterized in that The lower bearing assembly includes a lower TC inner sleeve, a lower TC outer sleeve, an upper impact sleeve, a lower impact sleeve and a steel ball. A conical mounting surface with a small upper portion and a large lower portion is provided on the outer side of the lower portion of the output main shaft corresponding to the position below the power housing. The mounting surface is provided with a lower TC inner sleeve sleeved on the outer side of the lower portion of the output main shaft. The outer side of the lower TC inner sleeve is sleeved with a lower TC outer sleeve which is fixedly mounted on the outer side and the inner side of the lower end of the power housing. A locking nut is fixedly mounted on the outer side of the lower portion of the output main shaft corresponding to the upper end position of the lower TC inner sleeve. A lower impact sleeve sleeved between the inner side of the power housing and the outer side of the output main shaft is fixedly mounted on the upper end of the locking nut. A plurality of lower track grooves with openings upward are distributed along the circumference of the upper end of the lower impact sleeve. The lower inner wall of the lower track groove includes a vertical surface, a first horizontal surface, an inclined surface and a second horizontal surface which are sequentially connected along the rotation direction of the rotor. The second horizontal plane is located above the first horizontal plane, the second horizontal plane of each lower track groove is transitionally connected to the upper end of the vertical plane of the lower track groove at the adjacent position, a steel ball is installed in the lower track groove, the inner side of the power housing corresponding to the position above the lower impact sleeve and the outer side of the upper impact sleeve are spline-connected together, and the lower end of the upper impact sleeve corresponding to each lower track groove position is provided with an upper track groove with an opening downward and the same structure as the lower track groove, the upper part of the steel ball is located in the upper track groove, and the elastic reset member is installed between the upper end of the upper impact sleeve and the lower end of the transmission main shaft; or / and, 3 to 5 lower track grooves are distributed along the circumference of the upper end of the lower impact sleeve; or / and, a limiting ring is fixed to the outer side of the lower part of the lower TC inner sleeve corresponding to the position below the lower TC outer sleeve, and an adjustment gasket is provided between the upper end of the elastic reset member and the lower end of the transmission main shaft.

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

6. The oscillation impact composite downhole power tool according to claim 3 or 4, characterized in that The connecting assembly includes a rotor joint, a universal coupling and a transmission 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 transmission shaft joint are connected together through a universal coupling. The first flow channel includes a main flow channel which is arranged in the center of the lower end of the transmission shaft joint and opens downward, and a secondary flow channel which is evenly distributed along the circumference on the outer side of the lower part of the transmission shaft joint and connected with the upper part of the main flow channel. The lower end of the transmission shaft joint is fixedly installed together with the upper end of the transmission main shaft.

7. The oscillation impact composite downhole power tool according to claim 5, characterized in that The connecting assembly includes a rotor joint, a universal coupling and a transmission 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 transmission shaft joint are connected together through a universal coupling. The first flow channel includes a main flow channel which is arranged in the center of the lower end of the transmission shaft joint and opens downward, and a secondary flow channel which is evenly distributed along the circumference on the outer side of the lower part of the transmission shaft joint and connected with the upper part of the main flow channel. The lower end of the transmission shaft joint is fixedly installed together with the upper end of the transmission main shaft.

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

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

10. The oscillation impact composite downhole power tool according to claim 2 or 3 or 4 or 7 or 8 or 9, characterized in that An anti-drop nut fixedly installed on the outer side of the upper end of the anti-drop connecting rod is mounted on the inner side of the lower end of the moving valve seat, and 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 corresponding to the position below the anti-drop nut.

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