A fluidic hydraulic shock drag reduction device

Abstract

The application provides a kind of jet flow type hydraulic shock drag reduction device, including outer cylinder and inner cylinder sleeved together.The outer cylinder is provided with jet flow element, and movable element is connected on the jet flow element.Valve mechanism is connected on movable element, and the valve mechanism can periodically change the pressure of fluid flowing through the valve mechanism under the driving of the movable element, and the pressure can overcome the elastic force of the first elastic element, so that the inner cylinder moves periodically relative to the outer cylinder along the axial direction.The jet flow type hydraulic shock drag reduction device of the application has small volume, can effectively reduce the frictional resistance of drill string in the drilling process, and reduce the hydraulic pressure consumption in the process of reducing resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oilfield exploitation, in particular to a jet flow type hydraulic oscillation drag reduction device. BACKGROUND

[0002] In the process of drilling an oil well, how to improve the drilling efficiency of the drill string is one of the problems to be solved in the drilling process.

[0003] The current common ideas and methods for improving the drilling efficiency of the drill string mainly include the following aspects: first, the drilling fluid performance is adjusted to reduce the drag of the drill string by improving the pressure and carrying capacity of the drilling fluid; second, the stability of the well wall and the trajectory of the wellbore are strengthened by cementing measures; third, the drilling efficiency is improved by optimizing the drilling tool assembly; and fourth, various drag reduction tools are used to reduce the drag of the drill string.

[0004] The currently used drag reduction tools mainly include roller type drag reduction tools and non-rotating drag reduction adapters, which have problems such as limited application conditions and unsatisfactory drag reduction effect. Downhole vibration drag reduction tools, and new hydraulic oscillation drag reduction tools can effectively solve these problems, thereby being recognized by the field and widely applied in the field. However, the existing hydraulic oscillators have large pressure consumption and large size, and thus cannot be applied to ultra-deep directional wells. SUMMARY

[0005] In view of the above technical problems, the present application aims to provide a jet flow type hydraulic oscillation drag reduction device. The jet flow type hydraulic oscillation drag reduction device has a small size, can effectively reduce the frictional resistance of the drill string during drilling, and can reduce the hydraulic pressure consumption during drag reduction.

[0006] According to the present application, a jet flow type hydraulic oscillation drag reduction device is provided, which comprises an outer cylinder and an inner cylinder inserted into the outer cylinder, a first channel for fluid flow is defined in the inner cylinder, a second channel is defined in the outer cylinder and communicates with the first channel, the inner cylinder can move along the axial direction of the outer cylinder; a first elastic member is used to fix the relative position of the outer cylinder and the inner cylinder; and a jet element is arranged in the second channel, a movable member is connected to the jet element, the jet element can generate alternating jet flow to drive the movable member to move periodically.

[0007] In the movable member, a valve mechanism is further connected, the valve mechanism can periodically change the pressure of the fluid flowing through the valve mechanism under the driving of the movable member, the pressure can overcome the elastic force of the first elastic member, so that the inner cylinder moves periodically relative to the outer cylinder along the axial direction.

[0008] In a preferred embodiment, a first cavity is connected to the fluidic element, the movable member is arranged in the first cavity and divides the first cavity into an upper chamber and a lower chamber, and the alternating fluidic flow generated by the fluidic element can periodically enter the upper chamber and the lower chamber to drive the movable member to swing in the first cavity.

[0009] In a preferred embodiment, the valve mechanism comprises a first disc valve connected to the movable member and arranged in the first passage, and a second disc valve arranged in the first passage away from the fluidic element, a plurality of first through holes and second through holes are respectively arranged on the first disc valve and the second disc valve, the second through holes are respectively communicated with the first through holes, and the first through holes and the second through holes are formed into a third passage communicated with the first passage. The second disc valve is fixed in the second passage, and the first disc valve can swing in the first passage under the drive of the movable member.

[0010] In a preferred embodiment, an annular space is formed between the outer wall and the inner wall of the outer cylinder body outside the fluidic element, the annular space extends to the end of the outer cylinder body away from the inner cylinder body to form a fourth passage for fluid flow, and the fourth passage is communicated with the first passage.

[0011] In a preferred embodiment, a flow distribution plate is arranged on the side of the fluidic element away from the first cavity, the flow distribution plate has a first liquid inlet communicated with the second passage and the third passage, and a second liquid inlet communicated with the second passage and the fourth passage.

[0012] In a preferred embodiment, a second cavity is arranged on the side of the flow distribution plate away from the fluidic element, a floating valve is arranged in the second cavity, the floating valve has a liquid outlet communicated with the second passage and the fluidic passage of the fluidic element, and a liquid discharge passage communicated with the fourth passage is formed between the floating valve and the second cavity. A first step portion is formed between the second cavity and the first passage, the floating valve can move in the second cavity to have a first position in which the liquid discharge passage is communicated with the second passage, and a second position in which the floating valve abuts against the first step portion to cut off the communication between the liquid discharge passage and the second passage.

[0013] In a preferred embodiment, the floating valve is connected to the flow distribution plate by a second elastic member.

[0014] In a preferred embodiment, an oil injection hole and an exhaust hole are respectively arranged on the outer wall of the outer cylinder body.

[0015] In a preferred embodiment, a second step portion is arranged on the outer wall of the inner cylinder body, and a chamfer is arranged on the second step portion.

[0016] In a preferred embodiment, a anti-ramming cover is further sleeved at the end of the outer cylinder body close to the inner cylinder body, and a sealing ring is further arranged between the anti-ramming cover and the outer wall of the outer cylinder body. BRIEF DESCRIPTION OF DRAWINGS

[0017] The application will be described below with reference to the drawings.

[0018] Figure 1 A schematic view of a water flow hydraulic oscillation drag reduction device according to an embodiment of the application is shown.

[0019] Figure 2 For Figure 1 A schematic view of a water flow hydraulic oscillation drag reduction device according to an embodiment of the application is shown.

[0020] Figure 3 For Figure 1 A schematic view of a water flow hydraulic oscillation drag reduction device according to an embodiment of the application is shown.

[0021] In the present application, all the drawings are schematic drawings, which are only used to illustrate the principles of the application, and are not drawn according to the actual scale. DETAILED DESCRIPTION

[0022] The application will be described below with reference to the drawings.

[0023] Figure 1 A water flow hydraulic oscillation drag reduction device 100 according to an embodiment of the application is shown. As Figure 1 shown, the water flow hydraulic oscillation drag reduction device 100 comprises an outer cylinder body 10 and an inner cylinder body 20, the inner cylinder body 20 is inserted into the outer cylinder body 10, so that the outer cylinder body 10 can move axially relative to the inner cylinder body 20. At the same time, a first elastic member 22 is arranged between the outer cylinder body 10 and the inner cylinder body 20 to keep the outer cylinder body 10 and the inner cylinder body 20 relatively fixed.

[0024] As Figure 1 shown, the inner cylinder body 20 is configured as a pipe, and a first channel 25 for fluid flow is defined in the inner cylinder body 20. A second channel 15 is defined in the outer cylinder body 10 and is in communication with the first channel 25, and a water flow element 30 is arranged in the second channel 15.

[0025] Figure 2 For Figure 1 A schematic view of a water flow hydraulic oscillation drag reduction device 100 according to an embodiment of the application is shown. As Figure 2As shown, a fluid inlet 31 is provided at the first end of the jet element 30, and two fluid outlets 32 are provided at the second end of the jet element 30 away from the fluid inlet 31. High-pressure fluid entering through the fluid inlet 31 can periodically flow out from the two fluid outlets 32 after passing through the jet element 30, thereby generating alternating jets at the fluid outlets 32. The structure and principle of this jet element 30 are well known to those skilled in the art, and a detailed description thereof is omitted here.

[0026] like Figure 1 As shown, a first cavity 40 is also connected to the fluid outlet 32 ​​of the jet element 30. A movable component 45 capable of moving within the first cavity 40 is disposed therein. The movable component 45 divides the first cavity 40 into an independent upper chamber 44 and a lower chamber 46, which are respectively connected to the two fluid outlets 32 of the jet element 30.

[0027] Therefore, when fluid entering the jet element 30 enters the upper chamber 44 through the fluid outlet 32 ​​communicating with the upper chamber 44, the movable member 45 will swing towards the lower chamber 46 under the action of fluid pressure. Similarly, when fluid entering the jet element 30 enters the lower chamber 46 through the fluid outlet 32 ​​communicating with the lower chamber 46, the movable member 45 will swing towards the upper chamber 44. It is easy to understand that the periodic oscillation of the movable member 45 within the first cavity 40 can be achieved by the alternating jet generated by the jet element 30 at the fluid outlet 32.

[0028] like Figure 1 As shown, a valve mechanism 251 is also provided in the first channel 25. The valve mechanism 251 includes a first disc valve 50 located at the end of the first chamber 40 away from the jet element 30. The first disc valve 50 is connected to the movable member 45. Furthermore, the diameter of the first disc valve 50 is smaller than the diameter of the second channel 15. Therefore, when the movable member 45 oscillates periodically within the first chamber 40, it can drive the first disc valve 50 to oscillate periodically within the second channel 15.

[0029] Meanwhile, the valve mechanism 251 also includes a second disc valve 60 disposed at the end of the first disc valve 50 away from the jet element 30. The diameter of the second disc valve 60 is configured to be the same as the inner diameter of the second channel 15, thereby allowing the second disc valve 60 to abut against the inner wall of the second channel 15 and be fixed within the second channel 15. When the first disc valve 50 oscillates periodically, the first disc valve 50 and the second disc valve 60 will move relative to each other in the radial direction of the second channel 15.

[0030] Figure 3For Figure 1 a schematic diagram of the first disc valve 50 of the fluidic hydraulic oscillation drag reduction device 100. As shown, the first disc valve 50 is configured in a disc shape. A plurality of first through holes 52 are provided on the first disc valve 50. Similarly, the second disc valve 60 is configured in a disc shape, and a plurality of second through holes (not shown) are provided on the second disc valve 60. The first through holes 52 and the second through holes are one-to-one corresponding, thereby forming a third passage 55 for fluid flow. When the high pressure fluid flows out from the first cavity 40, it can pass through the first through holes 52 and the second through holes which are connected to each other at one time to reach the end of the outer cylinder 10 away from the inner cylinder 20, and flow out of the outer cylinder 10. Figure 3 When the first disc valve 50 is periodically swung on the second disc valve 60 under the driving of the movable part 45, the first through holes 52 and the second through holes will be periodically misaligned and connected, thereby causing the effective diameter of the third passage 55 to be periodically reduced and increased.

[0031] It is easy to understand that when the effective diameter of the third passage 55 is reduced, the fluid pressure of the high pressure fluid flowing through the third passage 55 will also increase. The pressure generated by the fluid will act on the outer cylinder 10, thereby applying a force to the outer cylinder 10 towards the inner cylinder 20, pushing the outer cylinder 10 to move towards the inner cylinder 20. With the progress of this movement, the first elastic part 22 will be gradually compressed until the elastic force generated by the first elastic part 22 is balanced with the fluid pressure.

[0032] When the effective diameter of the third passage 55 is increased, the fluid pressure of the high pressure fluid flowing through the third passage 55 will also decrease. At this time, the first elastic part 22 in the compressed state will push the outer cylinder 10 to move away from the inner cylinder 20 until the elastic force generated by the first elastic part 22 is balanced with the fluid pressure.

[0033] In summary, by periodically swinging the first disc valve 50, the reciprocating movement of the inner cylinder 20 relative to the outer cylinder 10 in the axial direction can be controlled, thereby periodically changing the length of the fluidic hydraulic oscillation drag reduction device 100 of the present application. When the length of the fluidic hydraulic oscillation drag reduction device 100 of the present application is installed on the drill string (not shown) of the oil well, this periodic change in length will drive the drill string to periodically vibrate in the axial direction, thereby effectively reducing the friction between the drill string and the well wall.

[0034] As

[0035] Figure 1 ​As shown, in a preferred embodiment, the outer wall of the outer cylinder 10 outside the fluidic element 30 has an annular space 13 between the inner wall and the outer wall, which extends to the end of the outer cylinder 10 away from the inner cylinder 20. Thus, the annular space 13 forms a fourth channel 16 for fluid flow, which is in communication with the second channel 15.

[0036] Specifically, as Figure 1 As shown, a flow distribution plate 70 is arranged on the side of the fluidic element 30 away from the first cavity 40. The flow distribution plate 70 has a first liquid inlet 72 in communication with the second channel 15 and the first cavity 40, and a second liquid inlet 74 in communication with the second channel 25 and the fourth channel 16.

[0037] When high-pressure fluid flows from the second channel 15 to the flow distribution plate 70, part of the fluid can enter the first cavity 40 through the first liquid inlet 72, thereby generating a periodically changing pressure to drive the inner cylinder 20 to move. Another part of the fluid will flow along the second liquid inlet 74 to the fourth channel 16, thereby normally passing through the hydraulic shock drag reduction device 100 to perform normal drilling circulation operations.

[0038] With this arrangement, part of the downhole drilling fluid can normally participate in the drilling circulation operation without affecting the normal operation of the hydraulic shock drag reduction device 100, thereby effectively reducing the loss of drilling fluid pressure caused by the hydraulic shock drag reduction device 100, and avoiding the influence of this friction reduction and drag reduction process on normal drilling operations.

[0039] As Figure 1 As shown, in a preferred embodiment, a second cavity 80 is further arranged on the side of the flow distribution plate 70 away from the fluidic element 30. The second cavity 80 is provided with a floating valve 85, which has a fluidic channel 84 in communication with the second channel 15 and the fluidic element 30. At the same time, a liquid discharge channel 86 is formed between the floating valve 85 and the second cavity 80, which is in communication with the fourth channel 16.

[0040] At the same time, the second cavity 80 and the second channel 15 form a first step portion 18. The floating valve 85 can move in the second cavity 80 to have a first position in which the liquid discharge channel 86 is in communication with the second channel 15, and a second position in which the floating valve 85 abuts against the first step portion 18, thereby cutting off the communication between the liquid discharge channel 86 and the second channel 15.

[0041] When there is no fluid flowing through the first channel 25, the floating valve 85 is at the first position, and the communication between the second channel 15 and the fourth channel 16 is cut off. When fluid flows through the first channel 25, the floating valve 85 is moved towards the jet element 30 under the action of fluid pressure, and the communication between the second channel 15 and the fourth channel 16 is opened. With the increase of fluid pressure, the floating valve 85 moves more, and the opening between the floating valve 85 and the first step 18 is larger. At this time, the fluid flow to the third channel 16 is increased, and the fluid flow to the jet element 30 is decreased.

[0042] Thus, by the floating valve 85, the fluid flow to the fourth channel 16 and the jet element 30 can be automatically adjusted according to the fluid pressure, so that the thrust of the fluid on the inner cylinder 20 is always kept within a certain range. By this arrangement, on the one hand, the stability of the jet hydraulic oscillation drag reduction device 100 can be improved, and on the other hand, the loss of fluid pressure of the hydraulic oscillation drag reduction device 100 can be reduced.

[0043] Further, the floating valve 85 is connected to the flow distribution plate 70 by a second elastic member 88. The second elastic member 88 is configured to be in a natural state without force when the floating valve 85 is at the first position. By the second elastic member 88, the floating valve 85 can be automatically returned to the first position when there is no fluid flowing through the second channel 15. At the same time, by the second elastic member 88, a resistance can be provided when the fluid pushes the floating valve 85, so that the worker can adjust the impact force required for the fluid to push the floating valve 85 to a certain position by adjusting the elastic force of the second elastic member 88.

[0044] As shown in Figure 1 In a preferred embodiment, an oil injection hole 12 is further provided on the outer cylinder 10, which penetrates the outer wall of the outer cylinder 10. Through the oil injection hole 12, lubricating oil can be injected into the small gap (not shown) between the outer cylinder 10 and the inner cylinder 20, so as to reduce the friction between the inner cylinder 20 and the outer cylinder 10, thereby facilitating the axial movement of the inner cylinder 20 and the outer cylinder 10. At the same time, by injecting lubricating oil, the sliding wear between the inner cylinder 20 and the outer cylinder 10 can be reduced, thereby prolonging the service life of the inner cylinder 20 and the outer cylinder 10.

[0045] Further, the outer cylinder 10 is provided with exhaust holes 14 penetrating the outer wall of the outer cylinder. The exhaust holes 14 can exhaust the gas in the small gap between the outer cylinder 10 and the inner cylinder 20 during the oil injection process, preventing the gas from causing pressure build-up and hindering the injection of lubricating oil. At the same time, the exhaust of gas by the exhaust holes 14 also helps to improve the air tightness of the hydraulic shock drag reduction device 100.

[0046] In a preferred embodiment, a second step portion 24 is formed on the outer wall of the inner cylinder 20. The second step portion 24 can abut against the outer cylinder 10 after the relative movement of the outer cylinder 10 and the inner cylinder 20, thereby producing a limiting effect to prevent the relative movement of the outer cylinder 10 and the inner cylinder 20. At the same time, a chamfer 241 is formed on the second step portion 24. The chamfer 241 can reduce the damage to the outer cylinder 10 when the second step portion 24 and the outer cylinder 10 collide together, thereby prolonging the service life of the outer cylinder 10.

[0047] In a preferred embodiment, a second step portion 24 is formed on the outer wall of the inner cylinder 20. The second step portion 24 can abut against the outer cylinder 10 after the relative movement of the outer cylinder 10 and the inner cylinder 20, thereby producing a limiting effect to prevent the relative movement of the outer cylinder 10 and the inner cylinder 20. At the same time, a chamfer 241 is formed on the second step portion 24. The chamfer 241 can reduce the damage to the outer cylinder 10 when the second step portion 24 and the outer cylinder 10 collide together, thereby prolonging the service life of the outer cylinder 10.

[0048] At the same time, a sealing ring 19 is provided between the anti-impact cover 17 and the outer wall of the outer cylinder 10. The sealing ring 19 is sleeved on the outer wall of the outer cylinder 10 to seal the gap between the anti-impact cover 17 and the outer cylinder 10, thereby further improving the sealing performance of the water jet hydraulic shock drag reduction device 100.

[0049] In addition, in the present application, the outer cylinder 10 and the inner cylinder 20 are connected by means of splines. The spline connection can make the outer cylinder 10 and the inner cylinder 20 always rotate synchronously without affecting the axial movement between the outer cylinder 10 and the inner cylinder 20, thereby preventing the outer cylinder 10 and the inner cylinder 20 from being separated due to asynchronous rotation during the drilling rotation.

[0050] The working process of the water jet hydraulic shock drag reduction device 100 according to the present application is briefly described as follows.

[0051] In the process of oil drilling, the water jet hydraulic shock drag reduction device 100 according to the present application is used to be connected to the drill string and is lowered into the oil well together with the drill string.

[0052] When the high pressure drilling fluid flows through the drill string to the floating valve 85 of the first channel, the pressure of the fluid will overcome the elastic force of the second elastic member 88 to make the floating valve 85 move towards the jet element 30. Thus, a part of the fluid enters the jet element 30, and the other part of the fluid is discharged from the hydraulic shock-reducing device 100 through the fourth channel 16.

[0053] When the fluid passes through the jet element 30, the jet element 30 will convert the fluid into an alternating jet flow, thereby pushing the movable member 45 to swing in the first cavity 40, and further driving the first disc valve 50 to periodically swing on the second disc valve 60. With the swing, the effective diameter of the third channel 55 will periodically increase and decrease. Thus, the pressure of the fluid passing through the third channel 55 will periodically increase and decrease. This pressure will overcome the elastic force of the first elastic member 22 to make the outer sleeve 10 and the inner sleeve reciprocate along the axial direction. Thus, the size of the hydraulic shock-reducing device 100 is periodically changed.

[0054] With the change of the size of the hydraulic shock-reducing device 100, the downhole drill string will be periodically vibrated, thereby reducing the friction between the drill string and the well wall during the drilling process, and improving the drilling efficiency during the whole drilling process.

[0055] Finally, it should be noted that the above description is only the preferred embodiments of the present application, and does not constitute any limitation on the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A fluidic hydraulic oscillation drag-reducing device (100), comprising: an outer cylinder (10) and an inner cylinder (20) inserted into the outer cylinder, a first passage (25) for fluid flow being defined in the inner cylinder, a second passage (15) for fluid flow being defined in the outer cylinder and communicating with the first passage, the inner cylinder being movable along the axial direction of the outer cylinder; a first elastic member (22) for fixing the relative position of the outer cylinder and the inner cylinder, and a fluidic element (30) disposed in the second passage, a movable member (45) being connected to the fluidic element, the fluidic element being capable of generating an alternating fluid jet to drive the movable member to move periodically, wherein a valve mechanism (251) is further connected to the movable member, the valve mechanism being capable of periodically changing the pressure of fluid flowing through the valve mechanism under the drive of the movable member, the pressure being capable of overcoming the elastic force of the first elastic member so that the inner cylinder moves periodically relative to the outer cylinder along the axial direction, a first cavity (40) being connected to the fluidic element, the movable member being disposed in the first cavity and dividing the first cavity into an upper chamber (44) and a lower chamber (46), the alternating fluid jet generated by the fluidic element being capable of periodically entering the upper chamber and the lower chamber to push the movable member to swing in the first cavity, the valve mechanism comprising a first disc valve (50) connected to the movable member and disposed in the first passage, and a second disc valve (60) disposed on the side of the first disc valve away from the fluidic element, a plurality of first through holes (52) and second through holes being respectively provided on the first disc valve and the second disc valve, the second through holes being respectively in communication with the first through holes so that the first through holes and the second through holes form a third passage (55) in communication with the first passage; the second disc valve being fixed in the second passage, and the first disc valve being capable of swinging in the first passage under the drive of the movable member.

2. The fluidic hydrodynamic cavitation drag reduction device (100) as claimed in claim 1, wherein, an annular space (13) being formed between the outer wall and the inner wall of the outer cylinder outside the fluidic element, the annular space extending to the end of the outer cylinder away from the inner cylinder to form a fourth passage (16) for fluid flow, the fourth passage being in communication with the first passage.

3. The fluidic hydrodynamic cavitation drag reduction device (100) as claimed in claim 1, wherein, a flow distribution plate (70) being disposed on the side of the fluidic element away from the first cavity, the flow distribution plate having a first liquid inlet (72) in communication with the second passage and the third passage, and a second liquid inlet (74) in communication with the second passage and the fourth passage.

4. The fluidic hydrodynamic cavitation drag reduction device (100) as claimed in claim 3, wherein, a second cavity (80) being disposed on the side of the flow distribution plate away from the fluidic element, a floating valve (85) being disposed in the second cavity, the floating valve having a fluid jet passage (84) in communication with the second passage and the fluidic element, a liquid discharge passage (86) being formed between the floating valve and the second cavity and in communication with the fourth passage, The first step part (18) is formed between the second cavity and the first channel, and the floating valve is capable of moving in the second cavity to have a first position in which the drainage channel is communicated with the second channel, and a second position in which the floating valve abuts against the first step part to cut off the communication between the drainage channel and the second channel.

5. The fluidic hydrodynamic cavitation drag reduction device (100) as claimed in claim 4, wherein, The floating valve is connected with the flow distribution plate by a second elastic member (88).

6. The fluidic hydrodynamic cavitation drag reduction device (100) as claimed in claim 1, wherein, An oil injection hole (12) and an exhaust hole (14) are further arranged on the outer wall of the outer cylinder body.

7. The fluidic hydrodynamic cavitation drag reduction device (100) as claimed in claim 1, wherein, A second step part (24) is formed on the outer wall of the inner cylinder body, and a chamfer (241) is formed on the second step part.

8. The fluidic hydrodynamic cavitation drag reduction device (100) according to any one of claims 1-3, characterized in that, A stamping-proof cover (17) is further sleeved on the end of the outer cylinder body close to the inner cylinder body, and a sealing ring (19) is further arranged between the stamping-proof cover and the outer wall of the outer cylinder body.

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