Rotary controllable oil drainage device
By designing a rotary controllable oil drain, the anchoring mechanism and friction mechanism are used to achieve simple operation and high reliability of the oil drain, solving the problems of easy sticking and non-reusability of existing oil drains, reducing costs and improving utilization efficiency.
Patent Information
- Application Number
- CN202422830643.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-20
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-11-20
AI Technical Summary
Existing oil drains in oil and gas production have problems such as complex structure, easy jamming, poor reliability and non-reusability, which lead to operational difficulties and waste of resources.
A rotary controllable oil drainer was designed, which adopted an anchoring mechanism and a friction mechanism. The cam part was driven to rotate by rotating the upper joint, and the jaws were used to anchor the device in the casing. The shear pins provided shear force to achieve oil drainage. A sand prevention groove and a reset spring were set to improve reliability. The shear pins were replaceable for reuse.
The oil drain operation is simple, reliable and reusable, which reduces the cost of use and avoids the problems of parts falling off and sand body getting stuck.
Smart Images
Figure CN223447024U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of oil releasers, belong to oil and gas exploitation technical field, specifically a kind of rotary controllable oil releaser. BACKGROUND
[0002] In oil and gas exploitation, the oil valve on the oil pump is a one-way valve, and the crude oil stored in the oil pipe above the oil pump will not flow back to the well. In the pump lifting operation for oil well maintenance or other operations, the oil pipe needs to be lifted out. In order to prevent the crude oil in the oil pipe from causing wellhead pollution, the oil releaser is used to release the crude oil into the well before lifting the pipe. At the same time, the oil releaser can also release the liquid column pressure in the oil pipe and reduce the load of the workover rig.
[0003] However, the existing oil releasers often cannot be opened normally, which increases the difficulty of construction for the on-site operators. At present, there are many types of commonly used oil releasers, which can be generally divided into three types. The first type is a lifting type oil releaser, which needs to be used with a sucker rod or a hanging and bumping device. It not only requires precise assembly of the pipe column, but also must be replaced together after the pump pipe is lifted out if the rod is dropped or stuck during the operation. The second type is a breakable oil releaser, which is installed below the pump. This type of oil releaser cannot be used normally when the crude oil viscosity is high or the sucker rod is dropped or broken. The third type is an oil pipe anchor type oil releaser, which has a wide range of applications. However, due to its large outer diameter, the slips often cannot be released and retrieved, which leads to pipe column sticking or the anchor being unable to continue to be lowered after setting. In addition, it cannot be used in wells with pump sand exploration. Therefore, the main problems of the commonly used oil releasers are complex structure and operation, easy to stick, poor reliability, and cannot be restored for secondary use after opening, which causes resource waste. SUMMARY
[0004] To solve the above problems in the prior art, the utility model aims to provide an anti-sticking, simple and easy-to-operate oil releaser to improve the reliability of the oil releaser during use and make it reusable.
[0005] To achieve the above object, the utility model adopts the technical scheme as follows: A rotary controllable oil drain device, including a central pipe, an upper joint, a lower joint, a clamp frame, an anchoring mechanism, a friction mechanism, a grid, a return spring, the upper joint is a tubular shape with a closed upper end, and the lower end is provided with external threads, and is threadedly connected with the upper end of the central pipe, and the central pipe wall of the upper joint is provided with an oil drain hole at the position where the threads of the upper joint and the central pipe coincide, and the lower end of the upper joint is fixedly provided with a sealing ring for sealing the oil drain hole, and the central pipe and the upper joint are fixedly provided with a shear pin for fixing the two; the clamp frame is tubular, and is sleeved on the central pipe, and is provided with a window for mounting the anchoring mechanism and the friction mechanism, and the anchoring mechanism is arranged radially along the central pipe and partially extends out of the window; the friction mechanism is arranged radially along the central pipe and partially extends out of the window; the lower joint is threadedly connected with the lower end of the central pipe, and the return spring is movably sleeved between the clamp frame and the lower joint, and the two ends of the return spring abut against the clamp frame and the lower joint respectively.
[0006] As a limitation of the utility model: the anchoring mechanism comprises a cam part and a clamp tooth, the cam part is arranged along the central pipe axis and fixed on the central pipe, and the cam part comprises two convex segments with gradually increasing circumferential radius; one convex segment corresponds to one clamp tooth, the clamp tooth is movably sleeved in the window, one end of the clamp tooth abuts against the cam part towards the central pipe, and the other end extends out of the window.
[0007] As a limitation of the utility model: the cross section area of the clamp tooth at the end towards the central pipe is larger than the cross section area of the window.
[0008] As a limitation of the utility model: the friction mechanism comprises two friction blocks oppositely arranged along the circumference of the central pipe, a plurality of transversely arranged thrust springs are fixedly arranged at one end of the friction block towards the central pipe, and the other end of the thrust spring movably abuts against the central pipe.
[0009] As a limitation of the utility model: the number of thrust springs on each friction block is three.
[0010] As a limitation of the utility model: the cross section area of the friction block at the end towards the central pipe is larger than the cross section area of the window.
[0011] As a limitation of the utility model: a ring-shaped grid movably sleeved on the central pipe is arranged between the clamp frame and the return spring, and the grid is fixedly connected with the upper end of the return spring.
[0012] As a limitation of the utility model: a plurality of arc-shaped grooves are arranged on the upper surface of the grid, and a plurality of rolling balls are arranged in the arc-shaped grooves, and the upper part of the rolling ball protrudes from the upper surface of the grid and rolls with the clamp frame.
[0013] As a limitation of the utility model: a plurality of vertical sand prevention grooves are arranged on the outer surface of the lower part of the central pipe along the circumference thereof.
[0014] The oil leakage hole is sealed with high-temperature paraffin before use.
[0015] Due to the adoption of the above technical scheme, the utility model has the beneficial effects compared with the prior art, which are as follows:
[0016] (1) The utility model discloses a rotary opening type oil leakage device, and the position of the oil leakage device is relatively fixed by a friction mechanism initially, the upper joint is rotated, the cam part of the anchoring mechanism is driven to rotate, until the jaw is anchored in the sleeve, and the rotation is continued, the anchoring effect of the jaw provides sufficient shearing force for the cutting of the shear pin, and oil pipe oil leakage is realized.
[0017] (2) The utility model discloses a jaw and a friction block structure that are designed to prevent falling, solve the problem of pipe jamming caused by the falling of parts during the oil leakage process, and set a sand prevention groove that can accommodate fine sand particles, thereby avoiding the jamming of the oil leakage device by sand to a certain extent.
[0018] (3) The utility model discloses a new pin that can be replaced after use, and the oil leakage device can be reused after pressure test, thereby greatly saving the cost.
[0019] In summary, the utility model has the advantages of reasonable structure, simple operation, high use reliability, reusability and suitability for oil pipe oil leakage work. BRIEF DESCRIPTION OF DRAWINGS
[0020] The utility model will be described in further detail below in combination with the drawings and specific embodiments.
[0021] Figure 1 It is a front view of the utility model embodiment in the unused state.
[0022] Figure 2 It is a structure schematic view of the upper joint in the utility model embodiment.
[0023] Figure 3 It is a rear view of part of the structure in the utility model embodiment, and is used to display the position of the shear pin.
[0024] Figure 4 It is a state schematic view of the anchoring mechanism in the utility model embodiment, wherein Figure 4-1 It is the position relationship between the jaw and the cam part in the initial state, Figure 4-2 It is the position relationship between the jaw and the cam part in the anchoring state.
[0025] Figure 5This is a schematic structural diagram of the forceps teeth in an embodiment of the present utility model;
[0026] Figure 6 This is a structural diagram of the friction mechanism (after removing the clamp frame) in an embodiment of the present utility model;
[0027] Figure 7 This is a schematic diagram of the three-dimensional structure of the block according to an embodiment of the present utility model;
[0028] Figure 8 This is a structural diagram of the anchoring removal process according to an embodiment of the present invention;
[0029] Figure 9 This is a structural schematic diagram of the clamp frame being reset after the anchoring is released according to an embodiment of the utility model.
[0030] In the figure: 1-upper joint, 101-sealing ring, 2-center tube, 201-oil drain hole, 202-sand prevention groove, 3-shear nail, 4-clamp frame, 5-anchoring mechanism, 501-clamp teeth, 502-cam part, 503-widening part, 6-friction mechanism, 601-friction block, 602-thrust spring, 7-block, 701-ball, 8-reset spring, 9-lower joint. DETAILED DESCRIPTION
[0031] The preferred embodiment of the present invention will be described below with reference to the accompanying drawings. It should be understood that the rotary controllable oil drain described herein is a preferred embodiment and is only used to illustrate and explain the present invention, and does not constitute a limitation of the present invention.
[0032] The directional terms or positional relationships such as "upper" and "lower" described in the present invention are based on the directional relationships in the drawings in the present invention specification and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the content protected by the present invention. Example
[0033] This embodiment Figures 1 to 9 The figure shows a rotary controllable oil drain, comprising a center tube 2, an upper joint 1, a lower joint 9, a clamp frame 4, an anchor mechanism 5, a friction mechanism 6, a block 7, and a return spring 8. The device is placed in a casing (not shown) and connected to the oil pipe of a wellbore pump to drain the crude oil in the pipe.
[0034] like Figure 1 、 Figure 2As shown, the upper joint 1 is a tubular with closed upper end, and has external thread at its lower end, which is screwed with the internal thread of the upper end of the central pipe 22. The oil drain hole 201 is formed in the wall of the central pipe 22 at the position where the central pipe 22 is screwed with the upper joint 1. The oil drain hole 201 is blocked by the threaded part of the upper joint 1, and is sealed by the sealing ring 101 fixed on the outer part of the lower end of the upper joint 1. To further enhance the sealing effect, the oil drain hole 201 is sealed with high temperature paraffin wax before use.
[0035] As shown in Figure 3 the drawing, the shear pin 3 is fixed at the position where the central pipe 22 is screwed with the upper joint 1, and is arranged at the opposite side of the oil drain hole 201. The shear pin 3 is used to fix the upper joint 1 with the central pipe 22, and is cut off when a large rotating force is applied between the upper joint 1 and the central pipe 22, so that the upper joint 1 moves upward relative to the central pipe 22, and finally opens the oil drain hole 201 to drain oil. The shear pin 3 is a consumable, and can be replaced after the oil is drained once, so that the oil drain device can be reused, saving resources and greatly reducing the use cost.
[0036] The clamp frame 4 is a tubular, which is sleeved on the central pipe 22, and has windows for installing the anchoring mechanism 5 and the friction mechanism 6. The anchoring mechanism 5 has two windows, which are symmetrically arranged on the circumference of the clamp frame 4. The friction mechanism 6 also has two windows, which are symmetrically arranged on the circumference of the clamp frame 4.
[0037] The anchoring mechanism 5 includes a cam part 502 and a clamp tooth 501. The cam part 502 is arranged around the axis of the central pipe 22 and is fixed on the central pipe 22, which can be fixed by welding. The cam part 502 includes two convex sections with gradually increasing radius in the circumferential direction. One convex section corresponds to one clamp tooth 501, as shown in Figure 4 The clamp tooth 501 is movably sleeved in the window, and its end towards the central pipe abuts against the cam part 502. The other end of the clamp tooth 501 extends out of the window. The extension amount of the clamp tooth 501 is adjusted by the relative position of the clamp tooth 501 and the cam part 502, so that the clamp tooth 501 can be radially extended and retracted along the central pipe 22. Before use of the oil drain device, the position of the clamp tooth 501 is as shown in Figure 4-1 When the central pipe 22 is rotated in the forward direction, the cam part 502 is rotated, and the extension amount of the clamp tooth 501 is increased. The position of the clamp tooth 501 becomes as shown in Figure 4-2As shown in , at this time, the center tube 22 can be anchored in the sleeve by the jaws 501, providing shear force for cutting the shear nails 3. In order to prevent the jaws 501 from falling during use, the cross-sectional area of the jaws 501 facing the center tube 22 is larger than the cross-sectional area of the window opening, and is also larger than the cross-sectional area of the portion extending out of the window. When the jaws 501 are pushed out by the cam portion 502, the window can clamp the jaws 501 to ensure that the jaws 501 will not fall off the window. Specifically, one way is to set the outer peripheral surface of the jaws 501 perpendicular to the extending direction to an inclined plane, so that the cross-sectional area of the jaws 501 facing the center tube 22 is larger than the cross-sectional area of the portion extending out of the window, and of course larger than the cross-sectional area of the window opening. It can also be as follows Figure 5 As shown in FIG, in this embodiment, one configuration of the jaws 501 is as follows: a widened portion 503 is fixedly provided on the outer periphery of the end of the jaws 501 facing the center tube 22. The jaws 501 have a stepped structure that is smaller on the outside and larger on the inside, and the widened portion 503 is designed to abut against the window. Of course, the anti-drop function of the jaws 501 can also be achieved through other existing structures. To enhance the anchoring effect between the jaws 501 and the inner wall of the casing, the surface of the jaws 501 that contacts the casing can be roughened.
[0038] like Figure 6 As shown, the friction mechanism 6 includes a friction block 601 and a thrust spring 602. The friction block 601 extends through a window. Several thrust springs 602 are fixedly positioned transversely on the end surface of the friction block 601 facing the center tube 22. The other ends of the thrust springs 602 are movably abutted against the center tube 22. The thrust springs 602 are in a compressed state, causing the friction block 601 to frictionally engage the sleeve outside the center tube 22. Specifically, there are three thrust springs 602 for each friction block 601. To prevent the friction block 601 from falling during use, the cross-sectional area of the end of the friction block 601 facing the center tube 22 is larger than the cross-sectional area of the window opening and also larger than the cross-sectional area of the portion extending through the window, thereby ensuring that the friction block 601 does not fall out of the window. Specifically, in this embodiment, the friction block 601 is constructed by beveling the outer peripheral surface of the friction block 601, which is perpendicular to the direction of extension, so that the cross-sectional area of the end of the friction block 601 facing the center tube 22 is larger than the cross-sectional area of the portion extending through the window, and also larger than the cross-sectional area of the window opening. Of course, the structure of the friction block 601 can also be set as follows: the friction block 601 is fixed with a widened portion on the outer periphery of one end facing the central tube 22, and the friction block 601 has a stepped structure with a small outside and a large inside, and the widened portion is used to support the inside of the window.
[0039] The lower joint 9 is threadedly connected to the lower end of the center pipe 22. Specifically, in this embodiment, the upper end of the lower joint 9 is provided with an internal thread, which is connected to the external thread at the lower end of the center pipe 22. The outer diameter of the upper end of the lower joint 9 protrudes from the outer diameter of the center pipe 22. The lower end of the lower joint 9 is also provided with an external thread, which is threadedly connected to the oil pipe on the oil pump.
[0040] The reset spring 8 is located between the tong frame 4 and the lower joint 9, and the reset spring 8 is entirely wrapped around the outer surface of the central pipe 2. The reset spring 8 is used to provide an upward thrust for resetting the tong frame 4. An annular stop 7 is movably sleeved on the central pipe 2 between the upper end of the reset spring 8 and the tong frame 4. The stop 7 and the upper end of the reset spring 8 can be fixedly connected or abutted. The lower end of the reset spring 8 abuts on the part of the lower joint 9 that protrudes outward from the outer diameter of the central pipe 2. The stop 7 separates the tong frame 4 and the reset spring 8 when they rotate. Specifically, the upper end of the reset spring 8 is connected to or abuts on the stop 7, and the lower end of the reset spring 8 abuts on the part of the lower joint 9 that protrudes outward from the outer diameter of the central pipe 2.
[0041] As shown in Figure 7 , in order to reduce the friction of the tong frame 4 when it rotates, a plurality of arc-shaped grooves are formed on the upper surface of the stop 7. A plurality of rolling balls 701 are arranged in the arc-shaped grooves. The upper part of each rolling ball 701 protrudes from the upper surface of the stop 7 and rolls in contact with the tong frame 4.
[0042] Fine sand particles can be contained in crude oil. The drainage device cannot normally work due to the presence of sand particles during the oil drainage process before the tubing is pulled out. In this embodiment, a plurality of vertical sand-preventing grooves 202 are formed on the outer surface of the lower part of the central pipe 2 along the circumferential direction. When the tong frame 4 moves up and down, a small amount of sand particles can enter the sand-preventing grooves 202, thereby avoiding the fine sand particles from jamming the drainage device to a certain extent.
[0043] When this embodiment is implemented, Figure 1 , the tong teeth 501 are in the state shown in Figure 4-1 . The drainage device is lowered into the casing. The drainage device is relatively fixed in the casing by the friction block 601. The lower joint 9 is threadedly connected to the tubing and then lowered into the well. When oil drainage is needed, the upper joint 1 is rotated in the forward direction. Because the friction block 601 has friction with the casing, the tong frame 4 and the tong teeth 501 on the tong frame 4 are both fixed and cannot rotate relative to the casing. The upper joint 1 drives the central pipe 2 to rotate, thereby driving the cam portion 502 welded to the central pipe 2 to rotate. With the rotation of the cam portion 502, the extension of the tong teeth 501 increases. The tong teeth 501 can be maximally pushed out to the state shown in Figure 4-2 . At this time, the central pipe 2 is anchored in the casing. The upper joint 1 is continuously rotated, the shearing force on the shear pin 3 increases, and the shear pin 3 is then sheared. The upper joint 1 is continuously rotated to move upward until the drainage hole 201 is exposed. The drainage hole 201 is opened to drain oil. After the oil drainage is completed, the tubing is pulled out. At this time, the drainage device can be removed. Only the upper joint 1 needs to be lifted upward. The tong frame 4 is fixed relative to the casing due to the anchoring effect. The central pipe 2 and the cam portion 502 fixedly arranged on the central pipe 2 can move upward under the action of the upward lifting force. At the same time, the reset spring 8 is compressed, as shown in Figure 8As shown in the figure, when the cam part 502 is completely above the tong jaw 501, the tong jaw 501 will retract, releasing the anchoring of the central tube 2, slightly rotating the central tube 2, and the reset spring 8 will push the tong frame 4 back to the reset position, at which time the oil drain pipe state is as shown in the figure Figure 9 As shown in the figure, when the cam part 502 is completely above the tong jaw 501, the tong jaw 501 will retract, releasing the anchoring of the central tube 2, slightly rotating the central tube 2, and the reset spring 8 will push the tong frame 4 back to the reset position, at which time the oil drain pipe state is as shown in the figure Figure 9 As shown in the figure, when the cam part 502 is completely above the tong jaw 501, the tong jaw 501 will retract, releasing the anchoring of the central tube 2, slightly rotating the central tube 2, and the reset spring 8 will push the tong frame 4 back to the reset position, at which time the oil drain pipe state is as shown in the figure
Claims
1. A rotary controllable oil drain, characterized by: It includes a center tube, an upper joint, a lower joint, a clamp frame, an anchoring mechanism, a friction mechanism, a block, and a reset spring. The upper joint is a tube with a closed upper end, and its lower end is provided with an external thread, which is threadedly connected to the upper end of the center tube. An oil drain hole is provided on the wall of the center tube where the threads of the upper joint and the center tube coincide, and a sealing ring is fixed at the lower end of the upper joint to seal the oil drain hole; a shear nail is fixed between the center tube and the upper joint to fix the two; the clamp frame is tubular and is sleeved on the center tube, and a window for installing the anchoring mechanism and the friction mechanism is provided on the clamp frame, and the anchoring mechanism is arranged to be telescopically extended along the radial direction of the center tube and partially extends out of the window; the friction mechanism is arranged to be telescopically extended along the radial direction of the center tube and partially extends out of the window; the lower joint is threadedly connected to the lower end of the center tube, and a reset spring is movably sleeved between the clamp frame and the lower joint, and the two ends of the reset spring respectively abut the clamp frame and the lower joint.
2. The rotary controllable oil drain according to claim 1, characterized in that: The anchoring mechanism includes a cam portion and a clamp tooth. The cam portion is arranged around the axis of the center tube and fixed on the center tube. The cam portion includes two protruding sections with gradually increasing radius along the circumferential direction; one protruding section corresponds to one clamp tooth, and the clamp tooth is movably sleeved in the window. One end of the clamp tooth facing the center tube abuts against the cam portion, and the other end extends out of the window.
3. The rotary controllable oil drain according to claim 2, characterized in that: The cross-sectional area of the clamp teeth at one end facing the central tube is larger than the cross-sectional area of the window where the clamp teeth are located.
4. A rotary controllable oil drain according to any one of claims 1 to 3, characterized in that: The friction mechanism includes two friction blocks arranged opposite to each other along the circumference of the central tube. A plurality of laterally arranged thrust springs are fixed on one end of the friction block facing the central tube, and the other end of the thrust spring is movably abutted against the central tube.
5. The rotary controllable oil drain according to claim 4, characterized in that: The number of the thrust springs on each friction block is three.
6. The rotary controllable oil drain according to claim 5, characterized in that: The cross-sectional area of the friction block at one end facing the central tube is larger than the cross-sectional area of the window where the friction block is located.
7. A rotary controllable oil drain according to any one of claims 1 to 3, 5 and 6, characterized in that: An annular block movably sleeved on the central tube is provided between the clamp frame and the reset spring, and the block is fixedly connected to the upper end of the reset spring.
8. The rotary controllable oil drain according to claim 7, characterized in that: A plurality of arc grooves are provided on the upper surface of the block, and balls are built into the arc grooves. The upper parts of the balls protrude from the upper surface of the block and are in rolling contact with the clamp frame.
9. The rotary controllable oil drain according to claim 8, characterized in that: A plurality of vertical sand control grooves are provided on the outer surface of the lower portion of the central pipe along its circumference.
10. The rotary controllable oil drain according to claim 9, characterized in that: The oil drain hole is sealed with high-temperature paraffin before use.