CN115726693A - Friction-reducing and resistance-reducing device for drill stem - Google Patents
Friction-reducing and resistance-reducing device for drill stem Download PDFInfo
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- CN115726693A CN115726693A CN202111020296.XA CN202111020296A CN115726693A CN 115726693 A CN115726693 A CN 115726693A CN 202111020296 A CN202111020296 A CN 202111020296A CN 115726693 A CN115726693 A CN 115726693A
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- drill string
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Abstract
The invention provides a friction-reducing and resistance-reducing device for a drill string, which comprises an outer cylinder and an inner cylinder inserted into the outer cylinder, wherein a first channel for fluid to flow through is defined in the inner cylinder, a second channel communicated with the first channel is arranged in the outer cylinder, the outer cylinder can move along the axial direction of the inner cylinder, and an elastic piece for fixing the relative positions of the outer cylinder and the inner cylinder. The impeller is arranged in the first channel, and fluid can drive the impeller to rotate in the first channel when flowing through the impeller, so that pulse pressure is generated in the first channel when the fluid flows through the impeller, and the inner cylinder is pushed to reciprocate along the axial direction by overcoming the elasticity of the elastic piece.
Description
Technical Field
The invention relates to the field of oilfield exploitation, in particular to an antifriction and resistance reduction device for a drill stem.
Background
In the process of oil well drilling, how to improve the drilling efficiency of a drill string is one of the problems to be solved urgently in the drilling process.
The conventional thinking and method for improving the drilling efficiency of a drill string mainly have the following aspects: the first is to reduce the bit-feeding friction resistance by improving the pressure and the rock-carrying efficiency of the drilling fluid through the adjustment of the performance of the drilling fluid. Secondly, the stability of the well wall and the track of the well are enhanced through well cementation measures. And thirdly, the drilling efficiency is improved by optimizing the drilling tool assembly. Fourthly, various drag reduction tools are used for reducing the friction resistance of the drill string.
The existing frequently-used resistance reducing tools mainly comprise roller type resistance reducing tools, non-rotating resistance reducing joints and other devices, and the devices have the problems of limited application conditions, unobvious resistance reducing effect and the like. The underground vibration drag reduction tool and the novel hydraulic vibration drag reduction tool can effectively solve the problems, thereby being recognized on site and widely popularized and applied on site. However, the existing hydraulic oscillator has higher requirement on hydraulic conditions and cannot be applied to oil wells with insufficient hydraulic. Meanwhile, the pressure loss is large, and the deep well drilling tool cannot be applied to a deep well with a long length.
Disclosure of Invention
In view of the technical problems mentioned above, the present invention aims to provide a friction reducing and resistance reducing device for a drill string. The friction-reducing and resistance-reducing device for the drill string has low pressure consumption, can be suitable for deep oil wells, has low required pressure condition, and can be suitable for oil wells with insufficient underground water power.
According to the present invention there is provided a friction reducing and drag reducing arrangement for a drill string, comprising: the outer cylinder body can move along the axial direction of the inner cylinder body, and the elastic piece is used for fixing the relative position of the outer cylinder body and the inner cylinder body.
The impeller is arranged in the first channel and can be driven by fluid to rotate in the first channel, so that pulse pressure is generated in the first channel when the fluid flows through the impeller, and the inner cylinder is pushed to move back and forth relative to the outer cylinder along the axial direction by overcoming the elastic force of the elastic piece.
In a preferred embodiment, a pressure amplifier is further arranged at the end of the outer cylinder far away from the end of the inner cylinder, and the pressure amplifier is arranged as a helmholtz resonance cavity.
In a preferred embodiment, a flow guide element is further arranged on one side of the impeller close to the pressure amplifier, and the flow guide element is configured as a boss protruding out of the inner wall of the first channel.
In a preferred embodiment, an arc surface adapted to the impeller is provided on the flow guide member.
In a preferred embodiment, an oil hole penetrating through the outer wall of the outer cylinder body is further arranged on the outer cylinder body.
In a preferred embodiment, the outer cylinder is further provided with a vent hole penetrating through the outer wall of the outer cylinder.
In a preferred embodiment, a second step is formed on the outer wall of the inner cylinder, and a chamfer is formed on the second step.
In a preferred embodiment, an anti-impact gland is further sleeved at the end part of the outer cylinder body close to the inner cylinder body, and a sealing ring is further arranged between the anti-impact gland and the outer wall of the outer cylinder body.
In a preferred embodiment, the outer cylinder is connected with the inner cylinder through splines.
In a preferred embodiment, a protective slip ring is further arranged between the inner cylinder and the outer cylinder, and the fixed end of the elastic member is connected to the protective slip ring
Drawings
The invention will now be described with reference to the accompanying drawings.
FIG. 1 shows a schematic view of a friction reducing device for a drill string according to an embodiment of the present invention.
In the present application, the drawings are all schematic and are used only for illustrating the principles of the invention and are not drawn to scale.
Detailed Description
The invention is described below with reference to the accompanying drawings.
FIG. 1 shows a friction reducing device 100 for a drill string according to an embodiment of the present invention. The friction and resistance reducing device 100 for a drill string of the present invention is adapted to be connected to a drill string (not shown) and lowered into a well with the drill string. As shown in fig. 1, the friction reducing and resistance reducing device 100 for a drill string comprises an outer cylinder 10 and an inner cylinder 20, wherein the inner cylinder 20 is inserted into the outer cylinder 10, so that the outer cylinder 10 can move relative to the inner cylinder 20 in an axial direction. Meanwhile, an elastic member 22 for keeping the outer cylinder 10 and the inner cylinder 20 relatively fixed is disposed between the outer cylinder 10 and the inner cylinder 20 in the axial direction.
As shown in fig. 1, the inner cylinder 20 is configured in a tubular shape, and a first passage 25 for fluid communication is defined in the inner cylinder 20. Meanwhile, a second passage 15 communicated with the first passage is provided in the outer cylinder 10. Thus, when the inner barrel 20 is inserted into the outer barrel 10, fluid can flow from the first passage 25 into the second passage 15.
Meanwhile, an impeller 30 is provided in the second passage 15. The impeller 30 is capable of impeding the normal flow of fluid in the second passage 25, thereby creating a force in the second passage 15 that is opposite to the direction of fluid flow. When the inner cylinder 20 is inserted into the second passage 15, the force generated by this fluid overcomes the elastic force of the elastic member 22, and pushes the inner cylinder 20 to move away from the impeller 30, thereby increasing the length of the entire friction reducing device 100.
In the present invention, however, the impeller 30 is disposed in the first passage 25 in a direction parallel to the axial direction of the inner cylinder 20. With this arrangement, the impeller 30 can be caused to rotate when fluid flows through the impeller 30. And the effective diameter of the second passage 15 changes periodically as the impeller 30 rotates within the second passage 15. It will be readily appreciated that the pressure of the fluid flowing through the second passage 15 will vary periodically as the effective diameter of the second passage 15 changes periodically. Thereby, the fluid can be caused to generate a periodically varying pulse pressure in the second passage 15.
When the pressure generated by the fluid in the second passage 15 increases, the pressure pushes the inner cylinder 10 in the second passage 15 to move away from the impeller 30. As this process progresses, the elastic member 22 is gradually stretched until the elastic force of the elastic member 22 is equal to the pressure exerted by the fluid on the inner cylinder 20.
When the pressure exerted by the fluid on the inner cylinder 20 reaches a maximum value, the elastic force of the elastic member 22 also reaches a maximum value. At this time, as the impeller 30 continues to rotate, the effective diameter of the second passage 15 gradually increases, and the pressure of the fluid in the second passage 15 gradually decreases. At this time, the elastic force of the elastic member 22 is greater than the fluid pressure in the second passage 15, and the elastic member 22 pushes the inner cylinder 20 to move toward the impeller 30 until the fluid pressure in the second passage 15 reaches the minimum value.
It is easy to understand that as the impeller 30 is continuously rotated in the second channel 15 by the fluid, the inner cylinder 20 is continuously pushed to do periodic reciprocating motion along the axial direction, so that the length of the friction reducing and resistance reducing device 100 for a drill string of the present invention is periodically changed.
The length of the friction-reducing and resistance-reducing device 100 for the drill string is periodically changed, so that the drill string in the well is driven to reciprocate along the axial direction, and the drill string is continuously vibrated along the axial direction. With the continuous operation of the vibration process, the friction force generated between the drill string and the well wall can be effectively reduced, and the effects of reducing friction and resistance are achieved. Compared with the traditional hydraulic oscillation device, the impeller transmission mode is adopted, so that the mode that the fluid generates pulse pressure has higher transmission efficiency, and the pressure consumption of the fluid can be effectively reduced.
In a preferred embodiment, as shown in fig. 1, a pressure amplifier 40 is further provided at the end of the outer cylinder remote from the end of the inner cylinder. The pressure amplifier 40 is preferably arranged as a helmholtz resonator. The fluid in the second passage 15 enters the helmholtz resonator after passing through the impeller 30, so that the fluid resonates in the helmholtz resonator. This resonance effect intensifies the alternating pressure generated by the fluid and thereby increases the fluid pressure experienced by the inner cylinder 20. Therefore, the amplification effect of the pressure amplifier 40 can reduce the hydraulic pressure condition required by the friction reducing and resistance reducing device 100, so that the friction reducing and resistance reducing device 100 can be suitable for the working condition with low hydraulic pressure.
It should be noted that this helmholtz resonator is a device that is commonly used in actual production operations, and a detailed description thereof will be omitted.
In a preferred embodiment, a flow guide 50 is further provided on the side of the impeller 30 adjacent to the pressure amplifier 40, the flow guide 50 being configured as a projection 52 protruding from the inner wall of the first channel 25. After passing through the impeller 30, the fluid first passes through the flow guide 50 and then is discharged from the flow guide 50 into the pressure amplifier 40. The flow guide element 50 can collect the fluid, and prevent the fluid from being dispersed by the impeller 30 after flowing through the impeller 30, thereby reducing the pulse pressure generated by the fluid.
Meanwhile, the upper end surface 55 of the guide member 50 adjacent to the impeller is configured as an arc surface 55 adapted to the impeller 30. Thereby allowing the fluid to enter the pressure amplifier 40 through the arc after flowing through the impeller 30, the arc 55 can reduce the energy loss of the fluid when flowing through the flow guide 50.
In a preferred embodiment, as shown in fig. 1, oil holes 12 penetrating through the outer wall of the outer cylinder 10 are respectively formed on the outer cylinder 10. Lubricating oil can be injected into a small gap (not shown) between the outer cylinder 10 and the inner cylinder 20 in the radial direction through the oil injection holes 12, so that the frictional force between the inner cylinder 20 and the outer cylinder 10 is reduced, thereby further facilitating the movement between the inner cylinder 20 and the outer cylinder 10 in the axial direction. Meanwhile, the sliding abrasion between the inner cylinder 20 and the outer cylinder 10 can be reduced by injecting lubricating oil, so that the service life of the inner cylinder 20 and the outer cylinder 10 can be prolonged.
Further, the outer cylinder 10 is further provided with an exhaust hole 14 penetrating through the outer wall of the outer cylinder. The exhaust holes 14 can exhaust gas in a small gap between the outer cylinder 10 and the inner cylinder 20 in the radial direction during oil filling, so that the gas is prevented from generating pressure-holding during the oil filling to block the filling of lubricating oil. Meanwhile, the exhaust holes 14 can exhaust gas, which also helps to improve the air tightness of the friction-reducing and resistance-reducing device 100.
In a preferred embodiment, a second step 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 between the outer cylinder 10 and the inner cylinder 20 occurs, so that a limiting effect is generated, and the relative movement between the outer cylinder 10 and the inner cylinder 20 is hindered. At the same time, a chamfer 241 is also formed on the second step 24. The chamfer 241 can reduce the loss of the outer cylinder 10 due to the impact when the second step portion 24 and the outer cylinder 10 are impacted together, thereby prolonging the service life of the outer cylinder 10.
In a preferred embodiment, an anti-impact gland 17 is further sleeved at the end of the outer cylinder 10 close to the inner cylinder 20. The impact-resistant gland 17 is configured as a cover body that is sleeved on the outer cylinder 10. The impact-preventing cover 17 is preferably made of an elastic material so as to absorb an impact load caused by an impact through elastic deformation when the second step portion 24 collides with the outer cylinder 10, thereby reducing damage to the outer cylinder 10 and the second step portion 24 caused by the impact.
Meanwhile, a sealing ring 19 is arranged between the impact-proof gland 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 so as to seal a gap generated between the anti-impact pressure cover 17 and the outer cylinder 10, thereby further improving the sealing performance of the anti-friction and resistance-reducing device 100 for the drill string.
In addition, in the present invention, the outer cylinder 10 and the inner cylinder 20 are connected by splines. The spline connection can keep the synchronous rotation of the outer cylinder 10 and the inner cylinder 20 all the time without influencing 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 disengaged due to the asynchronous rotation during the rotation of the well drilling.
In a preferred embodiment, a protective slip ring 60 is further disposed between the inner cylinder 20 and the outer cylinder 10 in a radial direction. The protective slip ring 60 is configured as a ring sleeved on the outer wall of the inner cylinder 20, and the fixed end of the elastic member 22 is connected to the protective slip ring 60. The protective slip ring 60 is made of a colloid material with certain elasticity, and can generate a buffering effect, so that the impact on the elastic member 22 during the relative movement of the inner cylinder 20 and the outer cylinder 10 along the axial line and the radial vibration is reduced, and the service life of the elastic member 22 is prolonged.
The operation of the friction reducing and drag reducing apparatus 100 for a drill string according to the present invention is briefly described as follows.
The friction reducing and drag reducing device 100 for a drill string of the present invention is used to attach to a drill string and to lower the drill string into a well during oil drilling.
When high pressure drilling fluid flows through the drill string to the impeller 30 in the second passage, the impeller 30 can block the normal flow of fluid in the second passage 25, so as to generate a force in the second passage 15 opposite to the flow direction of the fluid, and push the inner cylinder 20 to move away from the impeller 30 against the elastic force of the elastic member 22. Meanwhile, when the fluid flows to the impeller 30, the impeller 30 is pushed to rotate, and the effective diameter of the second channel 15 is periodically changed.
As the effective diameter of the second passage 15 changes periodically, the pressure of the fluid also changes continuously, thereby generating a periodically changing pulse pressure. This pressure overcomes the elastic force of the elastic member 22 to reciprocate the inner cylinder 20 in the axial direction with respect to the outer cylinder 10. When the fluid flows to the pressure amplifier 40, the pressure amplifier 40 also generates a resonance effect, which intensifies the pulse pressure.
As the inner cylinder 20 reciprocates axially relative to the outer cylinder 10, the length of the friction reducing and resistance reducing device 100 changes periodically, so that the drill string connected to the friction reducing and resistance reducing device 100 vibrates axially, and the friction during drilling of the drill string is reduced.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and do not limit the present invention in any way. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing examples, or that equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A friction reducing and drag reducing device (100) for a drill string, comprising:
an outer cylinder (10) and an inner cylinder (20) inserted into the outer cylinder, a first passage (25) for fluid to flow through is defined in the inner cylinder, a second passage (15) communicated with the first passage is provided in the outer cylinder, the outer cylinder can move along the axial direction of the inner cylinder, and an elastic member (22) for fixing the relative positions of the outer cylinder and the inner cylinder,
wherein, an impeller (30) is arranged in the first channel, the impeller can be driven by fluid to rotate in the first channel, thereby generating pulse pressure in the first channel when the fluid flows through, and pushing the inner cylinder to overcome the elasticity of the elastic part and reciprocate along the axial direction relative to the outer cylinder.
2. An anti-friction and resistance-reducing device (100) for a drill string according to claim 1, wherein a pressure amplifier (40) is further provided at the end of the outer cylinder distal from the end of the inner cylinder, said pressure amplifier being provided as a helmholtz resonator.
3. An anti-friction and resistance-reducing device (100) for a drill string according to claim 2, characterized in that a flow guide (50) is further provided on the side of the impeller close to the pressure amplifier, the flow guide being configured as a boss protruding from the inner wall of the first passage.
4. A friction reducing and drag reducing device (100) for a drill string according to claim 3, wherein an arc face (55) adapted to the impeller is provided on the deflector.
5. An antifriction drag reduction device (100) for a drill string according to any of claims 1-4, characterized in that an oil hole (12) is also provided through the outer barrel.
6. An anti-friction and resistance-reducing device (100) for a drill string according to any one of claims 1-4, characterized in that a vent hole (14) is further provided through the outer cylinder.
7. An anti-friction drag reduction device (100) for a drill string according to any of claims 1-4, wherein a second step (24) is configured on the outer wall of the inner barrel, the second step having a chamfer (241) configured thereon.
8. An antifriction drag reduction device (100) for a drill string according to any one of claims 1-4, characterized in that an anti-impact gland (17) is further sleeved at the end of the outer barrel close to the inner barrel, and a sealing ring (19) is further provided between the anti-impact gland and the outer wall of the outer barrel.
9. A friction reducing device (100) for a drill string according to any of claims 1-4, wherein the outer cylinder is splined to the inner cylinder.
10. An anti-friction and resistance-reducing device (100) for a drill string according to any one of claims 1-4, characterized in that a protective slip ring (60) is further arranged between the inner and outer cylinders, to which protective slip ring the fixed end of the spring is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111020296.XA CN115726693A (en) | 2021-09-01 | 2021-09-01 | Friction-reducing and resistance-reducing device for drill stem |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111020296.XA CN115726693A (en) | 2021-09-01 | 2021-09-01 | Friction-reducing and resistance-reducing device for drill stem |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115726693A true CN115726693A (en) | 2023-03-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111020296.XA Pending CN115726693A (en) | 2021-09-01 | 2021-09-01 | Friction-reducing and resistance-reducing device for drill stem |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115726693A (en) |
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2021
- 2021-09-01 CN CN202111020296.XA patent/CN115726693A/en active Pending
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