CN114541996B - Axial sliding sleeve type downhole hydraulic pulse excitation tool - Google Patents
Axial sliding sleeve type downhole hydraulic pulse excitation tool Download PDFInfo
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- CN114541996B CN114541996B CN202011334670.9A CN202011334670A CN114541996B CN 114541996 B CN114541996 B CN 114541996B CN 202011334670 A CN202011334670 A CN 202011334670A CN 114541996 B CN114541996 B CN 114541996B
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- sliding sleeve
- hammer body
- hole
- outer cylinder
- fixing
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B28/00—Vibration generating arrangements for boreholes or wells, e.g. for stimulating production
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
Abstract
The application relates to an axial sliding sleeve type downhole hydraulic pulse excitation tool, which comprises an outer cylinder body, wherein a first through hole is arranged on the side wall of the lower part of the outer cylinder body in a penetrating way; the power structure comprises a screw, the bottom of the screw is connected with an eccentric gear, the eccentric gear is meshed in a central gear, and the bottom of the central gear is connected with a transmission shaft; the energy storage and pulse structure comprises a hammer body sleeve structure, a through hammer body via hole is arranged in the hammer body sleeve structure, a sliding sleeve is arranged below the hammer body sleeve structure, a second via hole is arranged on the side wall of the sliding sleeve in a through manner, and the sliding sleeve can periodically change the communication area between the second via hole and the first via hole; a sliding sleeve groove with an open top is arranged in the sliding sleeve. The tool can manufacture and store high-pressure fracturing fluid, release high-pressure fracturing pulse waves, realize the transformation of stratum and improve the oil and gas recovery ratio.
Description
Technical Field
The application relates to the technical field of hydraulic fracturing in petroleum engineering, in particular to an axial sliding sleeve type underground hydraulic pulse excitation tool.
Background
In the middle and later stages of oil field production exploitation, the oil well yield is continuously reduced, the production exploitation potential of an underground oil reservoir is further deeply exploited, the economic benefit of oil field enterprises is further effectively improved, the fracturing technology is gradually implemented in the oil production operation process, the fracturing technology has special characteristics, fixed-point seam making can be carried out underground under the condition of no separation, the underground construction operation time can be effectively solved, and the safety risk in the construction operation process can be avoided as much as possible.
Therefore, the inventor provides an axial sliding sleeve type downhole hydraulic pulse excitation tool by virtue of experience and practice of related industries for many years, and the tool can manufacture and store high-pressure fracturing fluid, release high-pressure fracturing pulse waves, realize the transformation of stratum and improve oil and gas recovery ratio.
Disclosure of Invention
The application aims to provide an axial sliding sleeve type downhole hydraulic pulse excitation tool which can manufacture and store high-pressure fracturing fluid, release high-pressure fracturing pulse waves, realize the transformation of stratum and improve oil and gas recovery ratio.
The application aims at realizing the aim that an axial sliding sleeve type downhole hydraulic pulse excitation tool comprises,
the outer cylinder body is provided with an opening at the top and a closed bottom, and a first via hole is arranged on the side wall of the lower part of the outer cylinder body in a penetrating way;
the power structure is arranged in the outer cylinder and comprises a screw rod which is axially fixed and can circumferentially rotate under the action of injected pressure liquid, the bottom of the screw rod is connected with an eccentric gear, the eccentric gear is meshed in a hollow and fixed central gear, the central gear and the screw rod are coaxially arranged, the bottom of the central gear is connected with a transmission shaft, and the bottom of the side wall of the transmission shaft is provided with a launder; the inner cavity of the central gear can be communicated with the flow through groove to form a first flow through channel;
the energy storage and pulse structure is arranged in the outer cylinder body and comprises a hammer body sleeve structure sleeved at the bottom of the transmission shaft, a through hammer body via hole is arranged in the hammer body sleeve structure, a sliding sleeve which can axially slide and is circumferentially fixed is arranged below the hammer body sleeve structure, a second via hole is arranged on the side wall of the sliding sleeve in a penetrating manner, and the communication area of the second via hole and the first via hole can be periodically changed by the sliding sleeve; the sliding sleeve is internally provided with a sliding sleeve groove with an open top, the hammer body through hole can be communicated with the sliding sleeve groove to form a second flow passage, and pressure liquid can form hydraulic pulse through the first flow passage, the second through hole and the first through hole.
In a preferred embodiment of the present application, the present application further includes a reset structure, where the reset structure includes a sleeve, a reset spring, and a spring fixing frame, the spring fixing frame is fixed on the outer cylinder, the sleeve extends downward from the bottom surface of the sliding sleeve, and the reset spring is sleeved on the sleeve, and the bottom of the reset spring is connected to the spring fixing frame.
In a preferred embodiment of the present application, the hammer casing structure includes an upper hammer and a lower hammer, the upper hammer is fixedly connected with the outer cylinder, a first hammer hole is axially and penetratingly arranged in the upper hammer, a second hammer hole is axially and penetratingly arranged in the lower hammer, and the first hammer hole and the second hammer hole are communicated to form the hammer via hole; the lower hammer body is fixedly arranged in the circumferential direction with the upper hammer body, the bottom of the lower hammer body is fixedly connected with the top of the sliding sleeve, and the lower hammer body can axially slide along with the sliding sleeve.
In a preferred embodiment of the present application, a plurality of blades are disposed at the bottom of the sidewall of the transmission shaft at intervals along the circumferential direction, and each of the blades is provided with a through-flow groove; the top of the first hammer body hole is provided with a taper hole part with the aperture gradually reduced from top to bottom, and the inner wall of the taper hole part is provided with a plurality of fixing clamping grooves; each blade can be clamped in each fixing clamping groove.
In a preferred embodiment of the present application, a check structure is sleeved at the lower part of the first hammer hole, the check structure comprises a hollow bolt with the bottom in the first hammer hole in a threaded connection manner, a check spring is sleeved on the outer wall of the hollow bolt, the top of the check spring is connected with a check valve, the check valve can move downwards to allow fracturing fluid to flow downwards, and the check valve can move upwards to disconnect the second flow passage.
In a preferred embodiment of the present application, a first step portion with a reduced diameter is provided on an inner wall of the outer cylinder, a fixed cylinder is sleeved at a bottom of the screw, a plurality of fixing plates are provided at a top of the fixed cylinder along a circumferential direction, and each fixing plate is capable of being fixedly connected to the first step portion; the bottom of the inner side of the fixed cylinder is connected with the central gear; the bottom of the screw is connected with a bent shaft, and the bottom of the bent shaft is connected with the eccentric gear; and a first bearing is sleeved between the bottom of the side wall of the screw and the inner wall of the fixed cylinder.
In a preferred embodiment of the present application, a first fixing cover is fastened to the top of the fixing cylinder, and the first fixing cover and the fixing plate are connected to the first step portion through a first bolt.
In a preferred embodiment of the present application, an upper fixing structure is disposed at the top end of the screw, the upper fixing structure includes a tail fixing frame capable of being fixed in the outer cylinder, a frame penetrating groove penetrating along an axial direction is disposed on the tail fixing frame, and the top end of the screw penetrates through the tail fixing frame and is connected with a flow-assisting top cover.
In a preferred embodiment of the present application, a second step portion with a reduced diameter is further provided in the outer cylinder, and the tail fixing frame is fixedly connected to the second step portion; the tail fixing frame is internally and axially penetrated with a frame center hole, the top end of the screw rod penetrates through the frame center hole, a second bearing is arranged between the screw rod and the side wall of the frame center hole, and the bottom of the frame center hole is connected with a second fixing cover; and a third fixing cover is buckled at the top of the tail fixing frame.
In a preferred embodiment of the present application, the outer cylinder includes a first outer cylinder section and a second outer cylinder section connected from top to bottom, the top and bottom of the first outer cylinder section are provided with openings, and the top of the second outer cylinder section is provided with an opening and the bottom is provided with a closed arrangement.
Therefore, the axial sliding sleeve type downhole hydraulic pulse excitation tool provided by the application has the following beneficial effects:
in the axial sliding sleeve type underground hydraulic pulse excitation tool provided by the application, the high-pressure fracturing fluid is injected from the ground to drive the screw rod to rotate at a high speed, after the speed is reduced by the power structure, the high-speed low-torque rotation is converted into the low-speed high-torque rotation, the sliding sleeve of the energy storage and pulse structure moves up and down, the second through hole and the first through hole periodically change the overflow area of the injected fracturing fluid through the change of the opening degree in relative axial movement, the change of flow and pressure can be regulated and controlled, and then regular pressure pulsation waves are generated; the reset structure elastically supplements the internal pressure of the energy storage and pulse structure and adjusts the position of the sliding sleeve, so that the pulse pressure is unstable due to the fact that the energy storage and pulse structure cannot store energy, and a regular pulse wave is formed.
Drawings
The following drawings are only for purposes of illustration and explanation of the present application and are not intended to limit the scope of the application. Wherein:
fig. 1: is a schematic diagram of the axial sliding sleeve type downhole hydraulic pulse excitation tool.
Fig. 2: is a schematic view of the outer cylinder of the present application.
Fig. 3: is a schematic diagram of an assembly process of the reset structure.
Fig. 4: the application is a schematic diagram of the assembly process of the energy storage and pulse structure.
Fig. 5: is a schematic diagram of the assembly process at the check flow structure of the present application.
Fig. 6: is a schematic diagram of the check flow structure of the present application after installation.
Fig. 7: is a schematic diagram of an assembly process of the power structure of the application.
Fig. 8: is a schematic diagram of an assembly process of the upper fixing structure of the application.
In the figure:
100. an axial sliding sleeve type downhole hydraulic pulse excitation tool;
1. an outer cylinder;
11. a first outer barrel section; 12. a second outer barrel section; 13. a first via;
3. a reset structure;
31. a spring fixing frame; 32. a return spring; 33. a sleeve;
4. an energy storage and pulse structure;
41. a sliding sleeve; 411. a second via; 412. a sliding sleeve groove; 42. a lower hammer body; 43. an upper hammer body;
5. a check flow structure;
51. a hollow bolt; 52. a check valve; 53. a check spring;
6. a power structure;
61. a transmission shaft; 611. a blade; 612. a flow trough; 62. a sun gear; 63. an eccentric gear; 64. a fixed cylinder; 65. a first bearing; 66. a first bolt; 67. a first fixed cover; 68. a screw;
7. an upper fixing structure;
71. a second fixed cover; 72. a second bearing; 73. a nut; 74. a third fixed cover; 75. a tail fixing frame; 76. a gasket; 77. a second bolt; 78. a flow-aid top cover; 79. a clasp ring.
Detailed Description
For a clearer understanding of technical features, objects, and effects of the present application, a specific embodiment of the present application will be described with reference to the accompanying drawings.
The specific embodiments of the application described herein are for purposes of illustration only and are not to be construed as limiting the application in any way. Given the teachings of the present application, one of ordinary skill in the related art will contemplate any possible modification based on the present application, and such should be considered to be within the scope of the present application. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, may be in communication with each other in two elements, may be directly connected, or may be indirectly connected through an intermediary, and the specific meaning of the terms may be understood by those of ordinary skill in the art in view of the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1-8, the present application provides an axial sliding sleeve type downhole hydraulic pulse excitation tool 100, comprising,
the outer cylinder body 1 is provided with an opening at the top and a closed bottom, and a first via hole 13 is arranged on the side wall of the lower part of the outer cylinder body in a penetrating way;
the power structure 6 is arranged in the outer cylinder 1 and comprises a screw 68 which is axially fixed and can circumferentially rotate under the action of injected pressure liquid, the bottom of the screw 68 is connected with an eccentric gear 63, the eccentric gear 63 is meshed in a hollow and fixed central gear 62, the central gear 62 and the screw 68 are coaxially arranged, the bottom of the central gear 62 is connected with a transmission shaft 61, and the bottom of the side wall of the transmission shaft 61 is provided with a launder; the inner cavity of the sun gear 62 can be communicated with the flow through groove to form a first flow through channel;
the energy storage and pulse structure 4 is arranged in the outer cylinder 1 and comprises a hammer body sleeve structure sleeved at the bottom of the transmission shaft 61, a through hammer body via hole is arranged in the hammer body sleeve structure, a sliding sleeve 41 which can axially slide and is circumferentially fixed is arranged below the hammer body sleeve structure, a second via hole 411 is arranged on the side wall of the sliding sleeve 41 in a penetrating manner, and the communication area of the second via hole 411 and the first via hole 13 can be periodically changed by the sliding sleeve 41; the sliding sleeve 41 is internally provided with a sliding sleeve groove 412 with an open top, the hammer body through hole can be communicated with the sliding sleeve groove to form a second through flow channel, and the pressure liquid can form hydraulic pulse through the first through flow channel, the second through hole 411 and the first through hole 13.
In the axial sliding sleeve type underground hydraulic pulse excitation tool provided by the application, the high-pressure fracturing fluid is injected into the ground to drive the screw rod to rotate at a high speed, after the speed is reduced by the power structure, the high-speed low-torque rotation is converted into the low-speed high-torque rotation, the sliding sleeve of the energy storage and pulse structure moves up and down, the second through hole and the first through hole periodically change the overflow area of the injected fracturing fluid through the change of the opening degree during relative axial movement, and the change of flow and pressure can be regulated and controlled, so that regular pressure pulsation waves are generated.
Further, as shown in fig. 3, the axial sliding sleeve type downhole hydraulic pulse excitation tool 100 of the present application further comprises a reset structure 3, wherein the reset structure 3 comprises a sleeve 33, a reset spring 32 and a spring fixing frame 31, the spring fixing frame 31 is fixed on the outer cylinder 1, the sleeve 33 extends downwards from the bottom surface of the sliding sleeve 41, the reset spring 32 is sleeved on the sleeve 33, and the bottom of the reset spring 32 is connected to the spring fixing frame 31. The reset structure 3 can elastically supplement the internal pressure of the energy storage and pulse structure 4 and adjust the position of the sliding sleeve 41, so that the unstable pulse pressure caused by the fact that the energy storage and pulse structure 4 cannot store energy is prevented, and a regular pulse wave is formed.
Further, as shown in fig. 4, the hammer casing structure includes an upper hammer 43 and a lower hammer 42, the upper hammer 43 is fixedly connected with the outer cylinder 1, a first hammer hole is formed in the upper hammer 43 in an axial through manner, a second hammer hole is formed in the lower hammer 42 in an axial through manner, and the first hammer hole and the second hammer hole are communicated to form a hammer through hole; the lower hammer 42 and the upper hammer 43 are fixedly arranged in the circumferential direction, the bottom of the lower hammer 42 is fixedly connected with the top of the sliding sleeve 41, and the lower hammer 42 can axially slide along with the sliding sleeve 41.
The ground is injected with high-pressure fracturing fluid into the outer cylinder body 1 through the top opening of the outer cylinder body 1, and the fracturing fluid enters the sliding sleeve groove through an annulus between the screw 68 and the outer cylinder body 1, a first through-flow channel (an inner cavity of the sun gear 62 and a through-flow groove) and a hammer body through-hole, and slides downwards under the pressure action of the fracturing fluid; after the power structure is decelerated, the pressure of the fracturing fluid is reduced, and the sliding sleeve 41 moves upwards to reset under the action of the reset structure 3; in the up-and-down movement process of the sliding sleeve 41, the opening degree of the second through hole and the opening degree of the first through hole are changed in the relative axial movement process, so that the flow area of the injected fracturing fluid is periodically changed, and a regular pulse wave is formed.
Further, as shown in fig. 1 and 7, a plurality of blades 611 are provided at the bottom of the side wall of the transmission shaft 61 at intervals in the circumferential direction, and each of the blades 611 is provided with a through-flow groove 612; the top of the first hammer body hole is provided with a taper hole part with a gradually-reduced aperture from top to bottom, and the inner wall of the taper hole part is provided with a plurality of fixing clamping grooves; each blade can be clamped in each fixing clamping groove.
Further, as shown in fig. 1, 5 and 6, the check flow structure 5 is sleeved at the lower part of the first hammer hole, the check flow structure 5 comprises a hollow bolt 51 with the bottom in the first hammer hole in a threaded connection manner, a check spring 53 is sleeved on the outer wall of the hollow bolt 51, the top of the check spring 53 is connected with a check valve 52, the check valve 52 can move downwards to allow fracturing fluid to flow downwards, and the check valve 52 can move upwards to disconnect the second flow passage. The check valve 52 moves up to block the bottom of the cone hole portion, thereby preventing the fracturing fluid from returning up.
Further, as shown in fig. 1 and 7, a first step portion with a reduced diameter is provided on the inner wall of the outer cylinder 1, a fixing cylinder 64 is sleeved at the bottom of the screw 68, a plurality of fixing plates are provided at the top of the fixing cylinder 64 along the circumferential direction, and each fixing plate can be fixedly connected to the first step portion; the inner bottom of the fixed cylinder 64 is connected with the sun gear 62; the bottom of the screw 68 is connected with a bent shaft, and the bottom of the bent shaft is connected with an eccentric gear 63; a first bearing 65 is provided between the bottom of the side wall of the screw 68 and the inner wall of the fixed cylinder 64.
Further, as shown in fig. 1 and 7, a first fixing cover 67 is fastened to the top of the fixing cylinder 64, and the first fixing cover 67 and the fixing plate are connected to the first step portion by a first bolt 66.
Further, as shown in fig. 1 and 8, an upper fixing structure 7 is disposed at the top end of the screw 68, the upper fixing structure 7 includes a tail fixing frame 75 capable of being fixed in the outer cylinder 1, a frame penetrating groove penetrating along the axial direction is disposed on the tail fixing frame 75, and the top end of the screw 68 penetrates through the tail fixing frame and then is connected with a flow-assisting top cover 78.
Further, as shown in fig. 1 and 8, a second stepped portion with a reduced diameter is further provided in the outer cylinder 1, and the tail fixing frame 75 is fixedly connected to the second stepped portion; the tail fixing frame 75 is internally and axially penetrated with a frame center hole, the top end of the screw 68 penetrates through the frame center hole, a second bearing 72 is arranged between the screw 68 and the side wall of the frame center hole, and the bottom of the frame center hole is connected with a second fixing cover 71; a third fixing cover 74 is fastened to the top of the tail fixing frame 75. The third fixing cover 74, the tail fixing frame 75 and the second fixing cover 71 are connected by a second bolt 77, and the second bolt 77 passes through the third fixing cover 74, the tail fixing frame 75 and the second fixing cover 71 from top to bottom and then the bottom end is fixed by a nut 73. To ensure tightness, a gasket 76 is provided between the third stationary cover 74 and the second bearing 72. To ensure stability of the tail mount 75, the top of the tail mount 75 is axially biased against a retaining ring 79.
Further, as shown in fig. 1 and 2, the outer cylinder 1 includes a first outer cylinder section 11 and a second outer cylinder section 12 connected from top to bottom, the top and bottom of the first outer cylinder section 11 are open, and the top and bottom of the second outer cylinder section 12 are closed.
Therefore, the axial sliding sleeve type downhole hydraulic pulse excitation tool provided by the application has the following beneficial effects:
in the axial sliding sleeve type underground hydraulic pulse excitation tool provided by the application, the high-pressure fracturing fluid is injected from the ground to drive the screw rod to rotate at a high speed, after the speed is reduced by the power structure, the high-speed low-torque rotation is converted into the low-speed high-torque rotation, the sliding sleeve of the energy storage and pulse structure moves up and down, the second through hole and the first through hole periodically change the overflow area of the injected fracturing fluid through the change of the opening degree in relative axial movement, the change of flow and pressure can be regulated and controlled, and then regular pressure pulsation waves are generated; the reset structure elastically supplements the internal pressure of the energy storage and pulse structure and adjusts the position of the sliding sleeve, so that the pulse pressure is unstable due to the fact that the energy storage and pulse structure cannot store energy, and a regular pulse wave is formed.
The foregoing is illustrative of the present application and is not to be construed as limiting the scope of the application. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this application, and are intended to be within the scope of this application.
Claims (8)
1. An axial sliding sleeve type downhole hydraulic pulse excitation tool is characterized by comprising,
the outer cylinder body is provided with an opening at the top and a closed bottom, and a first via hole is arranged on the side wall of the lower part of the outer cylinder body in a penetrating way;
the power structure is arranged in the outer cylinder and comprises a screw rod which is axially fixed and can circumferentially rotate under the action of injected pressure liquid, the bottom of the screw rod is connected with an eccentric gear, the eccentric gear is meshed in a hollow and fixed central gear, the central gear and the screw rod are coaxially arranged, the bottom of the central gear is connected with a transmission shaft, and the bottom of the side wall of the transmission shaft is provided with a launder; the inner cavity of the central gear can be communicated with the flow through groove to form a first flow through channel;
the energy storage and pulse structure is arranged in the outer cylinder body and comprises a hammer body sleeve structure sleeved at the bottom of the transmission shaft, a through hammer body via hole is arranged in the hammer body sleeve structure, a sliding sleeve which can axially slide and is circumferentially fixed is arranged below the hammer body sleeve structure, a second via hole is arranged on the side wall of the sliding sleeve in a penetrating manner, and the communication area of the second via hole and the first via hole can be periodically changed by the sliding sleeve; a sliding sleeve groove with an opening at the top is arranged in the sliding sleeve, the hammer body through hole can be communicated with the sliding sleeve groove to form a second flow passage, and pressure liquid can form hydraulic pulse through the first flow passage, the second through hole and the first through hole;
the hammer body sleeve structure comprises an upper hammer body and a lower hammer body, the upper hammer body is fixedly connected with the outer cylinder body, a first hammer body hole is formed in the upper hammer body in a penetrating manner in an axial direction, a second hammer body hole is formed in the lower hammer body in a penetrating manner in an axial direction, and the first hammer body hole and the second hammer body hole are communicated to form a hammer body through hole; the lower hammer body and the upper hammer body are fixedly arranged in the circumferential direction, the bottom of the lower hammer body is fixedly connected with the top of the sliding sleeve, and the lower hammer body can axially slide along with the sliding sleeve;
the check flow structure is sleeved at the lower part of the first hammer body hole, the check flow structure comprises a hollow bolt with the bottom in the first hammer body hole in a threaded connection mode, a check spring is sleeved on the outer wall of the hollow bolt, the top of the check spring is connected with a check valve, the check valve can move downwards to allow fracturing fluid to flow downwards, and the check valve can move upwards to disconnect the second flow passage.
2. The axial sliding sleeve type downhole hydraulic pulse excitation tool according to claim 1, further comprising a reset structure, wherein the reset structure comprises a sleeve, a reset spring and a spring fixing frame, the spring fixing frame is fixed on the outer cylinder body, the sleeve extends downwards from the bottom surface of the sliding sleeve, the reset spring is sleeved on the sleeve, and the bottom of the reset spring is connected to the spring fixing frame.
3. The axial sliding sleeve type downhole hydraulic pulse excitation tool according to claim 1, wherein a plurality of blades are arranged at the bottom of the side wall of the transmission shaft at intervals along the circumferential direction, and each of the blades is provided with a through flow groove; the top of the first hammer body hole is provided with a taper hole part with the aperture gradually reduced from top to bottom, and the inner wall of the taper hole part is provided with a plurality of fixing clamping grooves; each blade can be clamped in each fixing clamping groove.
4. The axial sliding sleeve type downhole hydraulic pulse excitation tool according to claim 1, wherein a first step part with a reduced diameter is arranged on the inner wall of the outer cylinder body, a fixed cylinder is sleeved at the bottom of the screw rod, a plurality of fixed plates are arranged at the top of the fixed cylinder along the circumferential direction, and each fixed plate can be fixedly connected to the first step part; the bottom of the inner side of the fixed cylinder is connected with the central gear; the bottom of the screw is connected with a bent shaft, and the bottom of the bent shaft is connected with the eccentric gear; and a first bearing is sleeved between the bottom of the side wall of the screw and the inner wall of the fixed cylinder.
5. The axial sliding sleeve type downhole hydraulic pulse excitation tool according to claim 4, wherein a first fixing cover is buckled on the top of the fixing cylinder, and the first fixing cover and the fixing plate are connected to the first step portion through a first bolt.
6. The axial sliding sleeve type downhole hydraulic pulse excitation tool according to claim 1, wherein an upper fixing structure is arranged at the top end of the screw rod, the upper fixing structure comprises a tail fixing frame capable of being fixed in the outer cylinder body, a frame penetrating groove penetrating along the axial direction is formed in the tail fixing frame, and the top end of the screw rod penetrates through the tail fixing frame and is connected with a flow-assisting top cover.
7. The axial sliding sleeve type downhole hydraulic pulse excitation tool according to claim 6, wherein a second step part with a reduced diameter is further arranged in the outer cylinder body, and the tail fixing frame is fixedly connected to the second step part; the tail fixing frame is internally and axially penetrated with a frame center hole, the top end of the screw rod penetrates through the frame center hole, a second bearing is arranged between the screw rod and the side wall of the frame center hole, and the bottom of the frame center hole is connected with a second fixing cover; and a third fixing cover is buckled at the top of the tail fixing frame.
8. The axial sliding sleeve type downhole hydraulic pulse excitation tool as claimed in claim 1 or 2, wherein the outer cylinder comprises a first outer cylinder section and a second outer cylinder section which are connected from top to bottom, the top and the bottom of the first outer cylinder section are arranged in an opening manner, and the top opening and the bottom of the second outer cylinder section are arranged in a closed manner.
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| CN202011334670.9A CN114541996B (en) | 2020-11-25 | 2020-11-25 | Axial sliding sleeve type downhole hydraulic pulse excitation tool |
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| CN202011334670.9A CN114541996B (en) | 2020-11-25 | 2020-11-25 | Axial sliding sleeve type downhole hydraulic pulse excitation tool |
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| CN114541996B true CN114541996B (en) | 2023-08-22 |
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| RU1810455C (en) * | 1989-12-14 | 1993-04-23 | Уфимский Нефтяной Институт | Pulsating vibrator |
| US9366100B1 (en) * | 2013-01-22 | 2016-06-14 | Klx Energy Services Llc | Hydraulic pipe string vibrator |
| CN106050177A (en) * | 2016-06-16 | 2016-10-26 | 西南石油大学 | Stick slip prevention torsion impact drilling tool |
| CN106917586A (en) * | 2017-05-09 | 2017-07-04 | 长江大学 | A kind of Well screw hydroscillator |
| CN108915659A (en) * | 2018-07-27 | 2018-11-30 | 长江大学 | A kind of low frequency waterpower pulse fracturing tool |
| CN108678675A (en) * | 2018-08-07 | 2018-10-19 | 长江大学 | A kind of three-dimensional hydraulic oscillator |
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| CN114541996A (en) | 2022-05-27 |
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