Driving sub for hydraulic oscillator

Abstract

A driving sub for a hydraulic oscillator, the driving sub comprising a sleeve (1), a reversing cylinder (32), a valve assembly (2) and a periodic torsion assembly (3), wherein the reversing cylinder is rotationally arranged in the sleeve, a first flow channel is formed in the reversing cylinder, and a second flow channel is formed between the reversing cylinder and the sleeve; the valve assembly is arranged at a liquid inlet end of the sleeve, the valve assembly is provided with a first liquid inlet hole and a second liquid inlet hole, and the first liquid inlet hole comprises a first central hole and a first eccentric hole (211); and the periodic torsion assembly is sleeved on the periphery of the reversing cylinder. The driving sub for a hydraulic oscillator uses a high-pressure drilling fluid as a driving medium, and the reversing cylinder is driven to rotate in a reciprocating manner by means of the fluid flowing into the periodic torsion assembly, thereby periodically changing the pressure of an internal flow field and generating pressure fluctuations. The driving sub for a hydraulic oscillator can be applied to high-temperature wells, thereby expanding the application range thereof; and the screwless structural design can reduce the length of the driving sub.

Description

A hydraulic oscillator drives a short section

[0001] Cross-reference to related applications

[0002] This application claims the benefit of Chinese Patent Application No. 202411706799.6, filed on November 26, 2024, the contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to the field of oil and gas extraction technology, and more specifically to a hydraulic oscillator driven sub. Background Technology

[0004] With the development of oil and gas well technology, the proportion of horizontal well exploration and development is gradually increasing. During horizontal well drilling, excessive frictional resistance between the drill string and the wellbore is a significant factor limiting the extension of the horizontal well. This is mainly due to the flexibility of the longer drill string and gravity. In horizontal well drilling, the drill string lies horizontally against the wellbore. Excessive gravity and frictional resistance between the drill string and the wellbore result in excessive frictional resistance. When this frictional resistance is too high, the drilling pressure cannot be effectively transmitted to the drill bit, thus reducing the drill bit's rock-breaking efficiency. When the frictional resistance exceeds a certain value, the drilling pressure is completely absorbed by the frictional resistance, meaning it cannot be transmitted to the drill bit at all. At this point, the drill bit cannot continue drilling, reaching the horizontal extension limit. The horizontal extension limit of a horizontal well is an important factor in evaluating the quality of horizontal well drilling. A longer horizontal extension leads to higher efficiency in oil and gas resource development. Therefore, in horizontal well drilling, it is necessary to maximize the horizontal extension limit.

[0005] Hydraulic oscillators are tools used to address excessive frictional resistance during horizontal well drilling. These tools are installed in the middle of the horizontal section of the drill pipe and generate high-frequency axial reciprocating oscillation loads to drive the drill pipe at both ends of the tool to move axially back and forth, thereby reducing frictional resistance. Currently, these tools are widely used in the field. A hydraulic oscillator mainly consists of an oscillating sub and a power sub. The oscillating sub is the mechanism for pressure transmission and release, while the power sub is the mechanism for generating pressure fluctuations. Current power subs are achieved through the continuous rotation of a screw structure. However, the screw structure mainly consists of a stator and a rotor. The stator is made of rubber, and the properties of rubber limit its application in high-temperature wells, thus limiting its use. Furthermore, the relatively long screw structure increases the length of the drive sub. Summary of the Invention

[0006] To address the technical problems of existing power subs with screw-structured drive systems being unusable in high-temperature wells and the need to increase the length of the power subs, this invention provides a hydraulic oscillator-driven sub.

[0007] This invention provides a hydraulic oscillator drive sub, comprising:

[0008] Sleeve;

[0009] A reversing cylinder is rotatably disposed inside the sleeve, a first flow channel is formed inside the reversing cylinder, and a second flow channel is formed between the reversing cylinder and the sleeve;

[0010] A valve assembly is disposed at the liquid inlet end of the sleeve. The valve assembly is provided with a first liquid inlet hole and a second liquid inlet hole. The first liquid inlet hole includes a first central hole and a first eccentric hole that communicate with the first flow channel. The second liquid inlet hole communicates with the second flow channel.

[0011] A periodic torsion assembly is sleeved on the outer periphery of the reversing cylinder. Fluid flowing into the first flow channel and fluid flowing into the second flow channel can both flow into the periodic torsion assembly, and it is configured as follows:

[0012] The fluid flowing into the periodic torsion assembly can drive the reversing cylinder to reciprocate, so that the reversing cylinder can block or release at least part of the first eccentric hole during rotation.

[0013] Optionally, the periodic torsion assembly includes an impact cylinder disposed within the sleeve and a transmission cylinder rotatably disposed within the impact cylinder. The end of the impact cylinder is provided with a third inlet hole communicating with the second inlet hole. A first transmission member is provided between the reversing cylinder and the transmission cylinder, and a second transmission member is provided between the impact cylinder and the transmission cylinder, configured as follows:

[0014] The fluid flowing into the periodic torsion assembly can drive the first transmission component, the second transmission component, and the transmission cylinder to rotate, thereby causing the reversing cylinder to rotate reciprocally.

[0015] Optionally, the first transmission component includes a plurality of first sector-shaped protrusions disposed on the outer periphery of the reversing cylinder, some of the first sector-shaped protrusions being provided with first reversing holes, and the outer periphery of another portion of the first sector-shaped protrusions being provided with push grooves, the inner wall of the push grooves being provided with first inclined surfaces.

[0016] The second transmission component includes a plurality of second sector-shaped protrusions disposed on the outer periphery of the transmission cylinder. The first transmission component also includes a push plate disposed on the inner wall of the transmission cylinder, the push plate extending into the push groove. A first transmission hole is provided on the side of the second sector-shaped protrusion on the cylinder wall of the transmission cylinder, and a third transmission hole is provided on the side of the push plate on the cylinder wall of the transmission cylinder.

[0017] The second transmission component also includes a plurality of third sector-shaped protrusions disposed on the inner wall of the impact cylinder, a sector-shaped groove is formed between two adjacent third sector-shaped protrusions, the second sector-shaped protrusion extends into the sector-shaped groove, and a first impact hole is provided through the third sector-shaped protrusion, so that the fluid introduced through the third liquid inlet hole can flow to the first impact hole.

[0018] The first reversing hole and the first transmission hole are positioned opposite each other. When the second sector-shaped protrusion abuts against the side wall of the sector-shaped groove, the first impact hole, the third transmission hole, and the first slope surface are positioned opposite each other.

[0019] Optionally, a second reversing hole is also provided on some of the first fan-shaped protrusions. The second reversing hole and the first reversing hole are spaced apart along the circumferential direction of the reversing cylinder. The inner wall of the push groove is also provided with a second slope surface that is opposite to the first slope surface.

[0020] The transmission cylinder has a second transmission hole on the side of the second sector-shaped protrusion away from the first transmission hole, and a fourth transmission hole on the side of the push plate away from the third transmission hole.

[0021] The third sector-shaped protrusion is provided with a second impact hole, and the fluid introduced through the third liquid inlet hole can flow to the second impact hole;

[0022] Specifically, when the second sector-shaped protrusion abuts against the side wall of the sector-shaped groove, and the inner wall of the push groove abuts against the push plate, the second reversing hole and the second transmission hole are positioned opposite each other; during rotation, the positions of the second impact hole, the fourth transmission hole, and the second inclined surface can be relative to each other.

[0023] Optionally, the outer periphery of the impact cylinder will have multiple impact grooves along its axial direction, and there will be multiple third liquid inlets. The multiple third liquid inlets are respectively opposite to the end positions of the multiple impact grooves, and the first impact hole, the second impact hole and the corresponding impact groove are connected.

[0024] Optionally, the end of the impact cylinder is provided with an end plate, and a plurality of the third liquid inlet holes are disposed on the end plate.

[0025] Optionally, the end of the reversing cylinder extends out of the periodic torsion assembly and abuts against the valve assembly. The extended end of the reversing cylinder is provided with a second central hole at a position corresponding to the first central hole, and a second eccentric hole is provided at a position corresponding to the first eccentric hole. The second central hole and the second eccentric hole are connected to the first flow channel.

[0026] Optionally, the liquid outlet end of the reversing cylinder is provided with a wear-resistant joint, the outer periphery of the wear-resistant joint is provided with a sloping surface, the sloping surface is provided with a plurality of sloping holes, and the sloping holes are connected to the periodic torsion assembly.

[0027] Optionally, the valve assembly includes a partition plate disposed at the liquid inlet end of the sleeve, wherein the first central hole, the first eccentric hole, and the second liquid inlet hole are sequentially disposed through the partition plate from the inside to the outside.

[0028] Optionally, a stationary valve is provided in the middle of the partition, and the first central hole and the first eccentric hole are formed on the stationary valve.

[0029] Optionally, the extended end of the reversing cylinder is provided with a connecting cap, and the interior of the connecting cap is provided with a moving valve, with the second central hole and the second eccentric hole formed on the moving valve.

[0030] Optionally, the outer periphery of the second fan-shaped protrusion is provided with a strip-shaped protrusion.

[0031] Optionally, a semi-circular hole is provided on the inner wall of the third sector-shaped protrusion, and the first impact hole and the second impact hole are located on both sides of the semi-circular hole.

[0032] Optionally, the inlet end of the sleeve is provided with an upper connector for connecting to the output end of the water supply assembly.

[0033] Optionally, the outlet end of the sleeve is provided with a lower connector.

[0034] The technical solution provided by the embodiments of the present invention has the following advantages compared with the prior art:

[0035] The hydraulic oscillator drive sub provided by this invention uses high-pressure drilling fluid as the driving medium. The fluid flowing into the periodic torsion assembly drives the reversing cylinder to rotate reciprocally, thereby blocking or releasing at least part of the first eccentric hole. The cross-sectional area of ​​the first eccentric hole, which is connected to the first fluid channel, is periodically changed, thereby periodically changing the pressure of the internal flow field and generating pressure fluctuations. This drive sub does not require the use of materials such as rubber, has high temperature resistance, and can be used in high-temperature wells, increasing its application range. Moreover, the screwless structure design can reduce the length of the drive sub, making the structure more compact. Attached Figure Description

[0036] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0038] Figure 1 is a cross-sectional view of the hydraulic oscillator drive section according to an embodiment of the present invention;

[0039] Figure 2 is a cross-sectional view of the hydraulic oscillator drive section in its initial state according to an embodiment of the present invention;

[0040] Figure 3 is a cross-sectional view of the hydraulic oscillator driven by the embodiment of the present invention when the second sector protrusion is in contact with the inner wall of the sector groove.

[0041] Figure 4 is a cross-sectional view of the hydraulic oscillator driving the short section to rotate for half a cycle according to an embodiment of the present invention.

[0042] Figure 5 is a structural schematic diagram of the reversing cylinder according to an embodiment of the present invention;

[0043] Figure 6 is a schematic diagram of the structure of the transmission cylinder according to an embodiment of the present invention;

[0044] Figure 7 is a schematic diagram of the structure of the impact cylinder according to an embodiment of the present invention;

[0045] Figure 8 is a schematic diagram of the structure of the dynamic valve according to an embodiment of the present invention;

[0046] Figure 9 is a schematic diagram of the static valve according to an embodiment of the present invention;

[0047] Figure 10 is a diagram showing the positional relationship between the dynamic valve and the static valve according to an embodiment of the present invention;

[0048] Figure 11 is a schematic diagram of the end plate according to an embodiment of the present invention;

[0049] Figure 12 is a schematic diagram of the wear-resistant joint according to an embodiment of the present invention. Detailed Implementation

[0050] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments and features of the present invention can be combined with each other.

[0051] The following description sets forth many specific details in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments described in the specification are only some, not all, of the embodiments of the invention.

[0052] As shown in Figure 1, the hydraulic oscillator drive section provided in this embodiment of the invention includes a sleeve 1, a reversing cylinder 32, a valve assembly 2, and a periodic torsion assembly 3.

[0053] The reversing cylinder 32 is rotatably disposed inside the sleeve 1, that is, the reversing cylinder 32 is coaxially disposed with the sleeve 1, allowing the reversing cylinder 32 to rotate relative to the sleeve 1. A first flow channel is formed inside the reversing cylinder 32, through which fluid can flow in through one end and out through the other end, thereby changing the pressure of the output fluid. A second flow channel is formed between the reversing cylinder 32 and the sleeve 1. A valve assembly 2 is disposed at the inlet end of the sleeve 1. The valve assembly 2 has a first inlet hole and a second inlet hole. The first inlet hole includes a first central hole and a first eccentric hole 211 communicating with the first flow channel. The second inlet hole communicates with the second flow channel, and includes multiple crescent-shaped holes disposed on the valve assembly 2. Preferably, there are four crescent-shaped holes to meet the inlet requirements while avoiding affecting the structural strength. Part of the fluid entering the inlet end of the sleeve 1 flows into the first flow channel through the first central hole and the first eccentric hole 211, and part enters the second flow channel through the second inlet hole. The periodic torsion assembly 3 is sleeved on the outer periphery of the reversing cylinder 32. The fluid flowing into the first flow channel and the fluid flowing into the second flow channel can both flow into the periodic torsion assembly 3. It is configured such that the fluid flowing into the periodic torsion assembly 3 can drive the reversing cylinder 32 to rotate back and forth, so that the reversing cylinder 32 can block or release at least part of the first eccentric hole 211 during rotation.

[0054] The hydraulic oscillator drive sub provided by this invention uses high-pressure drilling fluid as the driving medium. The fluid flowing into the periodic torsion assembly 3 drives the reversing cylinder 32 to rotate reciprocally, thereby blocking or releasing at least part of the first eccentric hole 211. The cross-sectional area of ​​the first eccentric hole 211, which is connected to the first fluid channel, is periodically changed, thereby periodically changing the pressure of the internal flow field and generating pressure fluctuations. This drive sub does not require the use of materials such as rubber, has the characteristics of high temperature resistance, and can be used in high-temperature wells, increasing the scope of application. Moreover, the screwless structure design can reduce the length of the drive sub, making the structure more compact.

[0055] In some embodiments, as shown in Figures 1 to 4, the periodic torsion assembly 3 includes an impact cylinder 31 disposed within a sleeve 1 and a transmission cylinder 33 rotatably disposed inside the impact cylinder 31. The impact cylinder 31, transmission cylinder 33, and reversing cylinder 32 are coaxially arranged. The end of the impact cylinder 31 is provided with a third inlet hole 311 communicating with a second inlet hole, so that fluid introduced through the second inlet hole can enter the impact cylinder 31 through the third inlet hole 311. A first transmission member is provided between the reversing cylinder 32 and the transmission cylinder 33, and a second transmission member is provided between the impact cylinder 31 and the transmission cylinder 33. The arrangement is such that the fluid flowing into the periodic torsion assembly 3 can drive the reversing cylinder 32 to reciprocate by pushing the first transmission member, the second transmission member, and the transmission cylinder 33 to rotate.

[0056] This design allows the first transmission component, the second transmission component, and the transmission cylinder 33 to rotate via high-pressure fluid, thereby driving the reversing cylinder 32 to rotate reciprocally without the need for additional drive components, thus reducing costs.

[0057] In some embodiments, as shown in FIG5, the first transmission component includes a plurality of first sector-shaped protrusions 322 disposed on the outer periphery of the reversing cylinder 32. The plurality of first sector-shaped protrusions 322 are spaced apart along the circumferential direction of the reversing cylinder 32. A portion of the first sector-shaped protrusions 322 are provided with first reversing holes 3221, which penetrate the reversing cylinder 32 for fluid communication. Another portion of the first sector-shaped protrusions 322 are provided with push grooves 3223 on the outer periphery. That is, push grooves 3223 are disposed on the outer wall of the reversing cylinder 32, and push grooves 3223 extend along the axial direction of the reversing cylinder 32. A first inclined surface 32231 is provided on the inner wall of push grooves 3223, wherein the length direction of the first inclined surface 32231 is consistent with the axial direction of the reversing cylinder 32.

[0058] As shown in Figure 6, the second transmission component includes multiple second sector-shaped protrusions 331 disposed on the outer periphery of the transmission cylinder 33. These protrusions are spaced apart along the circumferential direction of the transmission cylinder 33 and extend along the axial direction of the transmission cylinder 33. The first transmission component also includes push plates 332 disposed on the inner wall of the transmission cylinder 33, extending along the axial direction of the transmission cylinder 33. The push plates 332 extend into push grooves 3223, meaning the number of push plates 332 and push grooves 3223 are the same, and their positions correspond one-to-one. A first transmission hole 333 is provided on the side of the second sector-shaped protrusions 331 on the cylinder wall of the transmission cylinder 33, penetrating the transmission cylinder 33 to allow fluid flow. A third transmission hole 335 is provided on the side of the push plates 332 on the cylinder wall of the transmission cylinder 33, penetrating the transmission cylinder 33 to allow fluid flow.

[0059] As shown in Figure 7, the second transmission component also includes a plurality of third sector-shaped protrusions 312 disposed on the inner wall of the impact cylinder 31. The plurality of third sector-shaped protrusions 312 are spaced apart along the circumferential direction of the impact cylinder 31, and the third sector-shaped protrusions 312 extend along the axial direction of the impact cylinder 31. A sector-shaped groove 313 is formed between two adjacent third sector-shaped protrusions 312. The second sector-shaped protrusion 331 extends into the sector-shaped groove 313. That is, the number of second sector-shaped protrusions 331 and the sector-shaped groove 313 are the same, and their positions correspond one-to-one. A first impact hole 3121 is provided through the third sector-shaped protrusion 312, and the fluid introduced through the third liquid inlet hole 311 can flow to the first impact hole 3121.

[0060] The first reversing hole 3221 and the first transmission hole 333 are positioned opposite each other. When the second sector protrusion 331 abuts against the side wall of the sector groove 313, the first impact hole 3121, the third transmission hole 335 and the first slope surface 32231 are positioned opposite each other.

[0061] The working process of the periodic torsion component 3 is as follows:

[0062] As shown in Figure 2, in the initial state, the first eccentric hole 211 can be fully opened by the end of the reversing cylinder 32, or the first eccentric hole 211 is opposite to the second eccentric hole 321 at the end of the reversing cylinder 32. At this time, the communication area of ​​the first eccentric hole 211 is the largest, the push plate 332 contacts the side wall of the push groove 3223, the first reversing hole 3221 is opposite to the first transmission hole 333, and the first transmission hole 333 communicates with the fan-shaped groove 313. Most of the high-pressure fluid introduced into the sleeve flows into the reversing cylinder 32 through the first central hole and the first eccentric hole 211. Part of the fluid flowing into the reversing cylinder 32 flows out of the sleeve 1, and the other part can flow through the first reversing hole 3221 and the first transmission hole 333 to the side of the fan-shaped groove 313 located on the second fan-shaped protrusion 331. A small portion of the high-pressure fluid flows into the second flow channel through the second inlet hole and enters the impact cylinder 31. Then, the pressure difference drives the second sector-shaped protrusion 331 to drive the transmission cylinder 33 and the reversing cylinder 32 to rotate in a counterclockwise direction (the counterclockwise direction here refers to the counterclockwise direction shown in Figures 2 to 4), as shown in Figure 3, until the other side of the second sector-shaped protrusion 331 contacts the inner wall of the sector-shaped groove 313. At this time, the positions of the first impact hole 3121, the third transmission hole 335 and the first inclined surface 32231 are opposite.

[0063] Referring to Figure 3, after some fluid enters the second flow channel through the second inlet and the third inlet, the fluid acts on the first inclined surface 32231 through the first impact hole 3121 and the third transmission hole 335, and then pushes the reversing cylinder 32 to continue rotating counterclockwise through the pressure difference, as shown in Figure 4, until the inner wall of the push groove 3223 of the reversing cylinder 32 contacts the side wall of the push plate 332, completing half a cycle of rotation. During this process, the communication area between the first eccentric hole 211 and the first flow channel changes from maximum to minimum to change the flow rate of the fluid entering the reversing cylinder 32, causing the flow direction of the fluid flowing out of the sleeve 1 to change from maximum to minimum.

[0064] In some embodiments, as shown in FIG5, a second reversing hole 3222 is also provided on a portion of the first fan-shaped protrusion 322. The second reversing hole 3222 penetrates the reversing cylinder 32 to allow fluid communication. The second reversing hole 3222 and the first reversing hole 3221 are spaced apart along the circumferential direction of the reversing cylinder 32. The inner wall of the push groove 3223 is also provided with a second inclined surface 32232 that is opposite to the first inclined surface 32231. The length direction of the second inclined surface 32232 is consistent with the axial direction of the reversing cylinder 32, and the inclination direction of the first inclined surface 32231 and the second inclined surface 32232 are opposite.

[0065] As shown in Figure 6, a second transmission hole 334 is provided on the side of the second fan-shaped protrusion 331 away from the first transmission hole 333 on the cylinder wall of the transmission cylinder 33. The second transmission hole 334 passes through the transmission cylinder 33 to allow fluid flow. A fourth transmission hole 336 is provided on the side of the push plate 332 away from the third transmission hole 335 on the cylinder wall of the transmission cylinder 33. The fourth transmission hole 336 passes through the transmission cylinder 33 to allow fluid flow.

[0066] As shown in Figure 7, a second impact hole 3122 is provided through the third sector-shaped protrusion 312. Fluid introduced through the third liquid inlet hole 311 can flow to the second impact hole 3122. The second impact hole 3122 and the first impact hole 3121 are spaced apart along the circumferential direction of the impact cylinder 31.

[0067] When the second sector-shaped protrusion 331 abuts against the side wall of the sector-shaped groove 313, and the inner wall of the push groove 3223 abuts against the push plate 332, the second reversing hole 3222 and the second transmission hole 334 are in opposite positions; during rotation, the positions of the second impact hole 3122, the fourth transmission hole 336 and the second inclined surface 32232 can be in opposite positions.

[0068] As shown in Figure 4, when the communication area between the first eccentric hole 211 and the first flow channel is at its minimum, the second fan-shaped protrusion 331 abuts against the side wall of the fan-shaped groove 313, and the inner wall of the push groove 3223 of the reversing cylinder 32 contacts the side wall of the push plate 332. At this time, the positions of the second reversing hole 3222 and the second transmission hole 334 are opposite. The fluid flowing into the reversing cylinder 32 can flow to the side of the second fan-shaped protrusion 331 through the second reversing hole 3222 and the second transmission hole 334. The pressure difference pushes the second fan-shaped protrusion 331 to rotate clockwise (the clockwise direction here refers to the clockwise direction shown in Figures 2 to 4). At this time, the second fan-shaped protrusion 331 drives the transmission cylinder 33 and the reversing cylinder 32 to rotate synchronously in the clockwise direction until the positions of the second impact hole 3122, the fourth transmission hole 336, and the second inclined surface 32232 are reached. At this time, some fluid enters the second flow channel through the second inlet and the third inlet. The fluid then acts on the second inclined surface 32232 through the second impact hole 3122 and the fourth transmission hole 336, thereby driving the reversing cylinder 32 to continue rotating clockwise through the pressure difference, completing one cycle of rotation. This causes the communication area between the first eccentric hole 211 and the first flow channel to change from minimum to maximum, thereby changing the fluid flow rate entering the reversing cylinder 32. Consequently, the flow direction of the fluid flowing out of the sleeve 1 changes from minimum to maximum. At this time, the components of the periodic torsion assembly 3 reset, preparing for the next periodic rotation, thus enabling the periodic torsion assembly 3 to drive the reversing cylinder 32 to rotate reciprocally.

[0069] It can be seen that the periodic torsion component 3, designed in this way, can drive the reversing cylinder 32 to rotate periodically under fluid pressure, which meets the requirement of driving the short section to generate pressure fluctuations, and has the advantages of high temperature resistance and low pressure drop.

[0070] In some embodiments, as shown in FIG7, a plurality of impact grooves 314 are provided on the outer periphery of the impact cylinder 31 along its axial direction. The impact grooves 314 extend along the axial direction of the impact cylinder 31. There are multiple third liquid inlet holes 311, and the multiple third liquid inlet holes 311 are respectively opposite to the end positions of the multiple impact grooves 314. The first impact hole 3121, the second impact hole 3122 and their corresponding impact grooves 314 are connected.

[0071] In this design, each impact groove 314 can be connected to multiple first impact holes 3121 and second impact holes 3122 respectively, so that the fluid introduced through the third liquid inlet hole 311 can enter into multiple first impact holes 3121 and multiple second impact holes 3122, which facilitates the introduction of fluid and increases the uniformity of the fluid introduced through the first impact holes 3121 and second impact holes 3122.

[0072] In some embodiments, as shown in Figures 1 and 11, the end of the impact cylinder 31 is provided with an end plate 315, and a plurality of third liquid inlet holes 311 are provided on the end plate 315.

[0073] In this design, the end plate 315 and the reversing cylinder 32 are rotatably set. The end plate 315 has the effect of cutting off the fluid channel, so that the fluid introduced through the second inlet hole must enter the second flow channel through the third inlet hole 311, ensuring the fluid diversion effect.

[0074] In some embodiments, as shown in FIG1, the end of the reversing cylinder 32 extends out of the periodic torsion assembly 3 and abuts against the valve assembly 2. The extended end of the reversing cylinder 32 is provided with a second central hole at a position corresponding to the first central hole, and a second eccentric hole 321 is provided at a position corresponding to the first eccentric hole 211. The second central hole and the second eccentric hole 321 are connected to the first flow channel.

[0075] In this design, as the reversing cylinder 32 rotates, the first central hole and the second central hole remain connected. The flow rate of the fluid flowing into the first flow channel through the first central hole and the second central hole remains unchanged. However, as the reversing cylinder 32 rotates, the alignment degree of the first eccentric hole 211 and the second eccentric hole 321 changes periodically. Thus, as the reversing cylinder 32 rotates, the flow rate of the fluid flowing into the first flow channel through the first eccentric hole 211 and the second eccentric hole 321 can be changed, thereby changing the output flow rate of the drive sub.

[0076] In some embodiments, as shown in Figures 1 and 12, the liquid outlet end of the reversing cylinder 32 is provided with a wear-resistant connector 6, wherein the wear-resistant connector 6 is threadedly connected to the liquid outlet end of the reversing cylinder 32, increasing the convenience of disassembly and assembly. The outer periphery of the wear-resistant connector 6 is provided with a sloping surface, and the sloping surface has multiple inclined holes 61, which communicate with the periodic torsion assembly 3.

[0077] Under this design, when the pressure of the fluid conveyed by the reversing cylinder 32 is high, some of the fluid can flow back into the periodic torsion component 3, so that the fluid inside the sleeve 1 is in a circulating state, which meets the usage requirements under different working conditions and increases the service life of the equipment.

[0078] In some embodiments, as shown in FIG1, the valve assembly 2 includes a partition 21 disposed at the liquid inlet end of the sleeve 1, with a first central hole, a first eccentric hole 211, and a second liquid inlet hole sequentially disposed on the partition 21 from the inside to the outside. The partition 21 is connected to the sleeve 1 by screws to increase the connection strength and facilitate disassembly and assembly.

[0079] In this design, the fluid channels can be separated by the partition 21, so that the introduced fluid can flow to the first channel through the first central hole and the first eccentric hole 211, and the other part can enter the second flow channel through the second inlet hole, thus meeting the requirement of separate fluid transport.

[0080] In some embodiments, as shown in Figures 1, 9, and 10, a stationary valve 212 is provided in the middle of the partition 21, and a first central hole and a first eccentric hole 211 are formed on the stationary valve 212. The stationary valve 212 is connected to the partition 21 by a thread, which increases the convenience of disassembly and assembly.

[0081] This design method can increase the ease of opening the first central hole and the first eccentric hole 211.

[0082] In some embodiments, as shown in Figures 1, 8, and 10, the protruding end of the reversing cylinder 32 is provided with a connecting cap 323, and a movable valve 3231 is provided inside the connecting cap 323. The second central hole and the second eccentric hole 321 are formed on the movable valve 3231. The movable valve 3231 and the connecting cap 323 are connected by threads, which increases the convenience of disassembly and assembly.

[0083] This design increases the ease of creating the second central hole and the second eccentric hole 321. Furthermore, the abutting fit between the moving valve 3231 and the stationary valve 212 enhances the sealing effect and ensures that they can rotate relative to each other, resulting in smoother rotation. Additionally, the moving valve 3231 and the stationary valve 212 can be used as consumable parts, facilitating replacement and reducing costs.

[0084] In some embodiments, both the first eccentric hole 211 and the second eccentric hole 321 are crescent-shaped holes to avoid the opening being too large and affecting the structural strength of the stationary valve 212 and the dynamic valve 3231.

[0085] In this design, the valve assembly 2, the moving valve 3231, rotates periodically with the periodic operation of the periodic torsion assembly 3. When the moving valve 3231 rotates periodically, the alignment degree between its half-moon hole and the half-moon hole of the stationary valve 212 changes periodically. In the initial working state, the alignment degree is the highest, and the intermediate flow area is the largest. When the torsion structure has worked for half a cycle, the alignment degree is the lowest, and the intermediate flow area is the smallest. Most of the fluid flows into the impact cylinder 31 through the second inlet hole. Therefore, within one cycle, the alignment degree changes from the maximum to the minimum and then back to the maximum.

[0086] In some embodiments, the number of the first reversing hole 3221, the second reversing hole 3222, the first transmission hole 333, the second transmission hole 334, the third transmission hole 335, the fourth transmission hole 336, the first impact hole 3121, and the second impact hole 3122 can be set according to actual needs to meet the requirements of fluid flow and fluid pressure.

[0087] In some embodiments, as shown in FIG6, a strip-shaped protrusion 3311 is provided on the outer periphery of the second fan-shaped protrusion 331, wherein the strip-shaped protrusion 3311 is arranged along the extending direction of the second fan-shaped protrusion 331.

[0088] In this design, the strip protrusion 3311 can increase the fit between the second fan-shaped protrusion 331 and the inner wall of the impact cylinder 31, avoid the phenomenon of fluid communication on both sides of the second fan-shaped protrusion 331, and ensure that the fluid can provide sufficient pressure to the second fan-shaped protrusion 331.

[0089] In some embodiments, as shown in FIG7, a semi-circular hole 3123 is provided on the inner wall of the third sector protrusion 312, and the first impact hole 3121 and the second impact hole 3122 are located on both sides of the semi-circular hole 3123.

[0090] This design ensures a uniform strength distribution in the impact cylinder 31, and the semi-circular hole 3123 can buffer the incoming fluid.

[0091] In some embodiments, as shown in Figure 1, the inlet end of the sleeve 1 is provided with an upper connector 4 for connecting to the output end of the water supply component. The water supply component can be a water pump. The upper connector 4 is a tubular structure with threads at both ends. That is, one end of the upper connector 4 is connected to the output pipe of the water pump by a thread, and the other end of the upper connector 4 is connected to the sleeve by a thread, which increases the convenience of disassembly and assembly.

[0092] In this design, the upper connector 4 increases the convenience of connecting the sleeve to the water supply component, and the upper connector 4 can introduce fluid into the sleeve 1, which facilitates the introduction of fluid.

[0093] In some embodiments, as shown in Figure 1, the outlet end of the sleeve 1 is provided with a lower connector 5, wherein the lower connector 5 is threadedly connected to the outlet end of the sleeve, thereby increasing the convenience of disassembly and assembly.

[0094] In this design, the lower connector 5 can increase the convenience of connecting the sleeve 1 to subsequent components and facilitate the extraction of fluid.

[0095] In some embodiments, the hydraulic oscillator drive section of this application is made of all-metal material, that is, all components of the hydraulic oscillator drive section are made of metal material, in order to improve the high temperature and pressure resistance of the hydraulic oscillator drive section of this invention, so as to be suitable for high temperature and high pressure conditions and solve the problem of high frictional resistance in high temperature horizontal wells.

[0096] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0097] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention described herein.

Claims

1. A hydraulic oscillator driving sub, characterized in that, include: Sleeve (1); A reversing cylinder (32) is rotatably disposed inside the sleeve (1). A first flow channel is formed inside the reversing cylinder (32), and a second flow channel is formed between the reversing cylinder (32) and the sleeve (1). A valve assembly (2) is provided at the liquid inlet end of the sleeve (1). The valve assembly (2) is provided with a first liquid inlet hole and a second liquid inlet hole. The first liquid inlet hole includes a first central hole and a first eccentric hole (211) that communicate with the first flow channel. The second liquid inlet hole communicates with the second flow channel. A periodic torsion assembly (3) is sleeved on the outer periphery of the reversing cylinder (32). Fluid flowing into the first flow channel and fluid flowing into the second flow channel can both flow into the periodic torsion assembly (3), and it is configured as follows: The fluid flowing into the periodic torsion assembly (3) can drive the reversing cylinder (32) to reciprocate, so that the reversing cylinder (32) can block or release at least part of the first eccentric hole during rotation.

2. The hydraulic oscillator drive sub according to claim 1, characterized in that, The hydraulic oscillator drive section is made of metal.

3. The hydraulic oscillator drive sub according to claim 1, characterized in that, The periodic torsion assembly (3) includes an impact cylinder (31) disposed within the sleeve (1) and a transmission cylinder (33) rotatably disposed inside the impact cylinder (31). The end of the impact cylinder (31) is provided with a third inlet hole (311) communicating with the second inlet hole. A first transmission member is provided between the reversing cylinder (32) and the transmission cylinder (33), and a second transmission member is provided between the impact cylinder (31) and the transmission cylinder (33), configured as follows: The fluid flowing into the periodic torsion assembly (3) can drive the first transmission member, the second transmission member and the transmission cylinder (33) to rotate, thereby causing the reversing cylinder (32) to rotate back and forth.

4. The hydraulic oscillator drive sub according to claim 3, characterized in that, The first transmission component includes a plurality of first sector-shaped protrusions (322) disposed on the outer periphery of the reversing cylinder (32). A portion of the first sector-shaped protrusions (322) are provided with first reversing holes (3221), and another portion of the first sector-shaped protrusions (322) are provided with push grooves (3223) on the outer periphery. The inner wall of the push grooves (3223) is provided with a first inclined surface (32231). The second transmission component includes a plurality of second sector-shaped protrusions (331) disposed on the outer periphery of the transmission cylinder (33), and the first transmission component also includes a push plate (332) disposed on the inner wall of the transmission cylinder (33), the push plate (332) extending into the push groove (3223), a first transmission hole (333) is provided on the cylinder wall of the transmission cylinder (33) on the side of the second sector-shaped protrusions (331), and a third transmission hole (335) is provided on the cylinder wall of the transmission cylinder (33) on the side of the push plate (332); The second transmission component also includes a plurality of third sector-shaped protrusions (312) disposed on the inner wall of the impact cylinder (31), a sector-shaped groove (313) is formed between two adjacent third sector-shaped protrusions (312), the second sector-shaped protrusion (331) extends into the sector-shaped groove (313), and a first impact hole (3121) is provided through the third sector-shaped protrusion (312), so that the fluid introduced through the third liquid inlet hole (311) can flow to the first impact hole (3121); The first reversing hole (3221) is positioned opposite to the first transmission hole (333). When the second sector protrusion (331) abuts against the side wall of the sector groove (313), the first impact hole (3121), the third transmission hole (335), and the first ramp surface (32231) are positioned opposite to each other.

5. The hydraulic oscillator drive sub according to claim 4, characterized in that, A second reversing hole (3222) is also provided on part of the first fan-shaped protrusion (3222). The second reversing hole (3222) and the first reversing hole (3221) are spaced apart along the circumferential direction of the reversing cylinder (32). A second inclined surface (32232) is also provided on the inner wall of the push groove (3223) opposite to the first inclined surface (32231). The transmission cylinder (33) has a second transmission hole (334) on the side of the second fan-shaped protrusion (331) away from the first transmission hole (333) on the cylinder wall, and a fourth transmission hole (336) on the side of the push plate (332) away from the third transmission hole (335) on the cylinder wall. The third sector-shaped protrusion (312) is provided with a second impact hole (3122), and the fluid introduced through the third liquid inlet hole (311) can flow to the second impact hole (3122); When the second sector-shaped protrusion (331) abuts against the side wall of the sector-shaped groove (313) and the inner wall of the push groove (3223) abuts against the push plate (332), the second reversing hole (3222) and the second transmission hole (334) are in opposite positions; during rotation, the second impact hole (3122), the fourth transmission hole (336) and the second ramp surface (32232) can be in opposite positions.

6. The hydraulic oscillator drive sub according to claim 5, characterized in that, The outer periphery of the impact cylinder (31) will have a plurality of impact grooves (314) along its axial direction. There are multiple third liquid inlet holes (311), and the multiple third liquid inlet holes (311) are respectively opposite to the end positions of the multiple impact grooves (314). The first impact hole (3121), the second impact hole (3122) and the corresponding impact groove (314) are connected.

7. The hydraulic oscillator drive sub according to claim 3, characterized in that, The end of the impact cylinder (31) is provided with an end plate (315), and a plurality of the third liquid inlet holes (311) are provided on the end plate (315).

8. The hydraulic oscillator drive sub according to claim 1, characterized in that, The end of the reversing cylinder (32) extends out of the periodic torsion assembly (3) and abuts against the valve assembly (2). The extended end of the reversing cylinder (32) is provided with a second central hole at a position corresponding to the first central hole, and a second eccentric hole (321) is provided at a position corresponding to the first eccentric hole (211). The second central hole and the second eccentric hole (321) are connected to the first flow channel.

9. The hydraulic oscillator drive sub according to claim 1, characterized in that, The liquid outlet end of the reversing cylinder (32) is provided with a wear-resistant connector (6), and the outer periphery of the wear-resistant connector (6) is provided with a sloping surface. The sloping surface is provided with a plurality of inclined holes (61), and the inclined holes are connected to the periodic torsion assembly (3).

10. The hydraulic oscillator drive sub according to claim 1, characterized in that, The valve assembly (2) includes a partition (21) disposed at the liquid inlet end of the sleeve (1), wherein the first central hole, the first eccentric hole and the second liquid inlet hole are sequentially disposed on the partition (21) from the inside to the outside.

11. The hydraulic oscillator drive sub according to claim 10, characterized in that, A static valve (212) is provided in the middle of the partition (21), and the first central hole and the first eccentric hole (211) are opened on the static valve (212).

12. The hydraulic oscillator drive sub according to claim 8, characterized in that, The reversing cylinder (32) has a connecting cap (323) at its extended end. The connecting cap (323) has a moving valve (3231) inside it. The second central hole and the second eccentric hole (321) are opened on the moving valve (3231).

13. The hydraulic oscillator drive sub according to claim 4, characterized in that, The outer periphery of the second fan-shaped protrusion (331) is provided with a strip-shaped protrusion (3311).

14. The hydraulic oscillator drive sub according to claim 5, characterized in that, The inner wall of the third sector protrusion (312) is provided with a semi-circular hole (3123), and the first impact hole (3121) and the second impact hole (3122) are located on both sides of the semi-circular hole (3123).

15. The hydraulic oscillator drive sub according to claim 1, characterized in that, The inlet end of the sleeve (1) is provided with an upper connector (4) for connecting to the output end of the water supply assembly.

16. The hydraulic oscillator drive sub according to claim 1, characterized in that, The sleeve (1) is equipped with a lower connector (5) at the liquid outlet end.

Images