Reversible oil drainage device for oil well and use method

Abstract

The invention relates to the technical field of operation engineering, in particular to a reversible oil drainage device for an oil well and a using method. The reversible oil drainage device for the oil well comprises a valve body, a plugging piece and a control pull rod, the two ends of the valve body are used for being connected with an oil pipe, the valve body is provided with an oil drainage port, the plugging piece is arranged in the valve body and used for opening or closing the oil drainage port, the control pull rod is connected with the plugging piece, and the control pull rod is connected with the plugging piece. The plugging piece has a releasing state and a folding state; in the release state, the control pull rod can be separated from the valve body; and in the folding state, the operating pull rod can drive the plugging piece to open or close the oil drainage port. Opening and closing of the oil drainage device can be achieved by operating the pull rod to move up and down, rod detection operation of an oil well can be achieved, meanwhile, the oil drainage device can be repeatedly used, and cost is saved.

Description

Technical Field

[0001] The present invention discloses the field of operation engineering technology, and particularly relates to a reversible oil drain for an oil well and a method of using the same. Background Art

[0002] In order to ensure that the liquid in the oil pipe does not fall to the ground during the oil well operation, we install an oil drainer on the oil pipe. The oil drainer will be opened before the tubing string operation to drain the liquid in the oil pipe into the well through the oil drainer to achieve cleaning operations.

[0003] At present, the oil drainers used in our factory mainly include two types: the rod-throwing oil drainer and the pull-up oil drainer. The rod-throwing oil drainer is generally used in thin oil blocks. For high-condensate oil blocks, due to its unique crude oil characteristics, there is great resistance during the rod-throwing process, causing the rod to be unable to reach the oil drainer position, resulting in the oil drainer being unable to open. Therefore, the pull-up oil drainer is generally used on high-condensate oil wells, and the pull-up oil drainer achieves oil leakage through shear pins. After opening, the oil drainer must be replaced to meet the oil well production needs again. Therefore, the oil well rod inspection operation cannot be realized, and the oil drainer is a disposable product and cannot be reused. Summary of the invention

[0004] The present disclosure aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] To this end, in a first aspect of the present disclosure, a reversible oil drain device for an oil well is provided, comprising a valve body, a plugging member and an operating rod, wherein both ends of the valve body are used to be connected to an oil pipe, the valve body is provided with an oil drain port, the plugging member is arranged inside the valve body, and the plugging member is used to open or close the oil drain port, the operating rod is connected to the plugging member, and the plugging member has a released state and a retracted state; in the released state, the operating rod can be detached from the valve body; in the retracted state, the operating rod can drive the plugging member to open or close the oil drain port.

[0006] In a feasible embodiment, the blocking member includes a blocking member body, a first clip and a second clip, the blocking member body is used to block the oil drain port, the first clip and the second clip are respectively arranged at two ends of the blocking member body, in the released state, the diameter of the first clip or the second clip is larger than the diameter of the operating rod; in the retracted state, the diameter of the first clip or the second clip is smaller than the diameter of the operating rod.

[0007] In a feasible implementation manner, a release groove is provided inside the valve body, and the release groove is provided on a movable path at both ends of the blocking member, and the release groove is used to make the first clamping member or the first clamping member enter the release state.

[0008] In a feasible implementation manner, the operating rod is a cylinder, and a protrusion is provided in the middle portion of the operating rod in the extending direction, and the protrusion is used to abut against the first clamping member or the second clamping member in the retracted state.

[0009] In a feasible implementation manner, the first clamping member and the second clamping member are claw springs.

[0010] In a feasible implementation manner, connectors are provided at both ends of the valve body, and the connectors are used to be connected to the oil pipe.

[0011] In a feasible implementation manner, the connecting head is detachably connected to the valve body.

[0012] In a feasible implementation manner, a sealing portion is provided on the surface of the blocking member that contacts the inner wall of the valve body. The sealing portion includes a plurality of sealing members, and the plurality of sealing members are arranged at intervals along the extension direction of the blocking member.

[0013] In a feasible implementation manner, the sealing portion includes a first seal, a second seal and a third seal. The first seal and the second seal are O-ring seals, the third seal is a trapezoidal seal, and the third sealing ring is close to the oil drain port.

[0014] In a second aspect of the present disclosure, there is provided a method for using a reversible oil drain for an oil well, comprising the following steps:

[0015] Connecting oil pipes at both ends of the valve body, and connecting the sucker rods in the oil pipes at both ends to the two ends of the operating rod;

[0016] The operation rod is lowered, and the sucker rod is inserted into the sucker rod to drive the operating rod to move downward so that the blocking member closes the oil drain port;

[0017] During well repair work, the sucker rod is lifted to drive the operating rod to move upward so that the plugging member opens the oil drain port.

[0018] Compared with the prior art, the present invention at least includes the following beneficial effects: the two ends of the valve body of the present invention are used to connect with the oil pipe, the valve body is provided with an oil drain port, the plugging member is provided inside the valve body, and the plugging member is used to open or close the oil drain port, the operating rod is connected to the plugging member, and the plugging member has a release state and a retracted state; in the release state, the operating rod can be separated from the valve body; in the retracted state, the operating rod can drive the plugging member to open or close the oil drain port. The oil drainer can be opened and closed by the up and down movement of the operating rod, and the oil well rod inspection operation can be realized. At the same time, the oil drainer can be reused, saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the exemplary embodiments below. The accompanying drawings are only for the purpose of illustrating exemplary embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0022] Figure 1 It is a partial cross-sectional schematic diagram of the overall structure of the present disclosure;

[0023] Figure 2 It is a schematic structural diagram of the blocking member disclosed in the present invention;

[0024] Figure 3 This is one of the structural schematic diagrams of the operating pull rod disclosed in the present invention;

[0025] Figure 4 This is the second structural schematic diagram of the operating rod disclosed in the present invention.

[0026] in, Figures 1 to 4 The corresponding relationship between the reference numerals and the component names is as follows: 1-valve body; 11-oil drain port; 12-release groove; 13-connector; 2-blocking member; 21-blocking member body; 22-first clamping member; 23-second clamping member; 24-first sealing member; 25-second sealing member; 26-third sealing member; 3-operating rod; 31-protrusion. DETAILED DESCRIPTION

[0027] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0029] At present, the oil drainers used in our factory mainly include two types: the rod-throwing oil drainer and the pull-up oil drainer. The rod-throwing oil drainer is generally used in thin oil blocks. For high-condensate oil blocks, due to its unique crude oil characteristics, there is great resistance during the rod-throwing process, causing the rod to be unable to reach the oil drainer position, resulting in the oil drainer being unable to open. Therefore, the pull-up oil drainer is generally used on high-condensate oil wells, and the pull-up oil drainer achieves oil leakage through shear pins. After opening, the oil drainer must be replaced to meet the oil well production needs again. Therefore, the oil well rod inspection operation cannot be realized, and the oil drainer is a disposable product and cannot be reused.

[0030] Based on this, the embodiment of the present disclosure provides a reversible oil drain for oil wells, which can open and close the oil drain port on the valve body of the sealing member by operating the up and down movement of the pull rod, thereby realizing the oil well rod inspection operation. At the same time, the oil drain can be reused to save costs.

[0031] The reversible oil drain device for oil wells is described in detail below through specific embodiments:

[0032] Reference Figures 1 to 4 As shown, the present disclosure provides a reversible oil drain for an oil well, comprising a valve body 1, a plugging member 2 and an operating rod 3, wherein both ends of the valve body 1 are used to be connected to an oil pipe, the valve body 1 is provided with an oil drain port 11, the plugging member 2 is arranged inside the valve body 1, and the plugging member 2 is used to open or close the oil drain port 11, the operating rod 3 is connected to the plugging member 2, and the plugging member 2 has a released state and a retracted state; in the released state, the operating rod 3 can be separated from the valve body 1; in the retracted state, the operating rod 3 can drive the plugging member 2 to open or close the oil drain port 11.

[0033] In this embodiment, the valve body 1 of the present invention can be set to a shape such as a cylinder or a rectangular parallelepiped. The present invention specifically selects a cylinder. A accommodating space is provided in the valve body 1 and an oil drain port is provided on the side wall so that when the oil drain port 11 is opened, oil can flow out from the oil drain port 11. The blocking member 2 is provided in the accommodating space for blocking and opening the oil drain port 11. It should be noted that the blocking member 2 can be an annular member that cooperates with the damping of the inner wall of the valve body 1 to ensure that the oil drain port 11 can be blocked in any state, or it can be a long strip plate-like member. However, in the embodiment of the long strip plate-like member, the blocking member 2 should be able to ensure that the oil drain port 11 can be blocked or opened according to a certain movement route, such as setting a slide groove, etc. The blocking member 2 of the present invention specifically selects the form of a long strip plate-like member. Specifically, the blocking member 2 has a release state and a retracted state. In the release state, the operating rod 3 can be separated from the valve body 1, that is, the blocking member 2 cannot limit the movement range of the operating rod 3 in the release state, and can be separated from the valve body 1; in the retracted state, the operating rod 3 can drive the blocking member 2 to open or close the oil drain port 11, that is, the blocking member 2 can limit the movement range of the operating rod and the blocking member 2 is in contact with the operating rod 3, so that the operating rod 3 can apply a force to the blocking member 2 to move it in the accommodating space and thus open or close the oil drain port 11. It should be noted that the switching between the release state and the retracted state is at the limit position after opening or closing the oil drain port 11. Specifically, for example, the operating rod 3 drives the blocking member to move to the limit position such as Figure 1 As shown, the right side moves, and the end of the plugging member 2 at the oil drain port 11 is released and connected to the inside of the valve body 1, so that the operating rod 3 can be disengaged from the plugging member 2 and then moved out from one end of the valve body 1. When in use, the two ends of the valve body 1 are respectively connected to the oil pipes, and the two ends of the operating rod 3 are respectively connected to the sucker rods in the oil pipes at the two ends of the valve body 1, so that when the sucker rod is pulled or inserted, the operating rod 3 can be driven to move up and down, thereby driving the plugging member 2 to open or close the oil drain port 11.

[0034] like Figure 4 As shown, another embodiment of the operating rod of the present invention is shown. In order to meet the needs of various oil pumps and pipelines, the operating rod 3 is configured with a corresponding form. In this embodiment, one end of the operating rod 3 is longer so that the maximum diameter part of the operating rod 3 and the sealing member 2 is not in the middle part of the entire operating rod 3, thereby achieving different movement ranges of the sealing member 2 driven by the operating rod 3 under the same stretching length of the sucker rod.

[0035] In some embodiments, the blocking member 2 includes a blocking member body 21, a first clip 22 and a second clip 23. The blocking member body 21 is used to block the oil drain port 11. The first clip 22 and the second clip 23 are respectively arranged at two ends of the blocking member body 21. In the released state, the diameter of the first clip 22 or the second clip 23 is larger than the diameter of the operating rod 3; in the retracted state, the diameter of the first clip 22 or the second clip 23 is smaller than the diameter of the operating rod 3.

[0036] In this embodiment, the plugging member body 21 is used to plug the oil drain port 11. In order to allow the first clamping member 22 and the second clamping member 23 to have a release space, a plugging surface can be set on the plugging member body 21, and the plugging member protrudes from the plugging member body 21. Among them, in the matching relationship between the first clamping member 22 and the second clamping member 23 and the operating rod 3, the first clamping member 22 and the second clamping member 23 can be selected to surround the operating rod 3 in the retracted state, that is, the opening diameter of the first clamping member 22 or the second clamping member 23 is smaller than the maximum diameter of the operating rod 3, thereby limiting the operating rod 3 within the range of the plugging member 2, so that it can abut against the first clamping member 22 or the second clamping member 23 and drive the plugging member body 21 to move. Further, in the released state, the first clamping member 22 or the second clamping member 23 is released, so that the opening diameter of the first clamping member 22 or the second clamping member 23 is smaller than the maximum diameter of the operating rod 3.

[0037] In some embodiments, a release groove 12 is provided inside the valve body 1 , and the release groove 12 is provided on the movable path at both ends of the blocking member 2 , and the release groove 12 is used to make the first clamping member 22 or the first clamping member 22 enter a released state.

[0038] In this embodiment, in order to allow the first clamping member 22 and the second clamping member 23 to have a better release space, a release groove 12 is provided on the valve body 1, and the release groove 12 is provided on the movement trajectory of the blocking member 2. It should be noted that in order to enable the blocking member 2 to open or close the oil drain port 11, the distance between the two release grooves 12 must be greater than the length of the blocking member 2, and when the first clamping member 22 enters the corresponding release groove 12, the oil drain port 11 can be blocked and closed by the blocking member body 21, and when the second clamping member 22 enters the corresponding release groove 12, the blocking member body 21 moves to open the oil drain port 11.

[0039] In some embodiments, the operating rod 3 is a cylinder, and a protrusion 31 is provided in the middle portion of the operating rod 3 in the extending direction, and the protrusion 31 is used to abut against the first clamping member 22 or the second clamping member 23 in the retracted state. Specifically, in some embodiments, the first clamping member 22 and the second clamping member 23 can be configured as claw springs.

[0040] In some embodiments, connectors 13 are provided at both ends of the valve body 1, and the connectors 13 are used to connect to the oil pipe.

[0041] In this embodiment, in order to facilitate the connection between the valve body 1 and the oil pipe, connectors 13 can be provided at both ends of the valve body 1. The connectors 13 can be quick connectors or threaded connectors, which are adapted to be connected with the oil pipe. Furthermore, the connectors 13 are detachably connected to the valve body 1 to facilitate the replacement of connectors of different sizes to adapt to oil pipes of different sizes.

[0042] In some embodiments, a sealing portion is provided on the surface where the plugging member 2 contacts the inner wall of the valve body 1, and the sealing portion includes a plurality of seals, which are arranged at intervals along the extension direction of the plugging member 2. Specifically, the sealing portion includes a first seal 24, a second seal 25, and a third seal 26, wherein the first seal 24 and the second seal 25 are O-ring seals, the third seal 26 is a trapezoidal seal, and the third seal ring is close to the oil drain port 11. The first seal 24, the second seal 25, and the third seal 26 are arranged on the surface where the inner wall contacts, so as to achieve good sealing between the plugging member 2 and the valve body 1, so that the oil can only flow out at the oil drain port 11. The trapezoidal seal can be better embedded in the plugging member body 21 to prevent displacement caused by long-term movement.

[0043] In a second aspect of the present disclosure, there is provided a method for using a reversible oil drain for an oil well, comprising the following steps:

[0044] When the sucker rod is lowered, the sucker rod is lowered to drive the operating rod 3 downward, and the operating rod 3 continues to move downward through the plugging member 2, and after contacting the first clamping member 22, it drives the plugging member body 21 downward. At this time, the second clamping member 23 of the plugging member 2 escapes from the contraction groove 12 of the valve body 1 and moves downward. When the first clamping member 22 of the plugging member 2 reaches the corresponding contraction groove 12, the first clamping member 22 opens, and the inner diameter of the first clamping member 22 is larger than the outer diameter of the operating rod 2. The operating rod 2 is separated from the plugging member 2 and continues to move downward. At this time, the oil drain port 11 on the valve body 1 is blocked and closed by the plugging member body 21.

[0045] During well repair, the sucker rod is lifted to drive the operating rod 3 upward, and the operating rod 3 continues to move upward through the first clamping part 22 of the plugging part 2, and contacts the second clamping part 23 of the plugging part 2 to drive the plugging part 2 upward. At this time, the first clamping part 22 of the plugging part 2 escapes from the contraction groove 12 and moves upward. When the second clamping part 23 of the plugging part 2 reaches the corresponding contraction groove 12 of the valve body 1, the second clamping part 23 opens, and the inner diameter of the second clamping part 23 is larger than the outer diameter of the operating rod 2. The operating rod 2 is separated from the plugging part 2 and continues to move upward. At this time, the plugging part body 21 moves away from the oil drain port 11 to complete the opening of the oil drain port 11.

[0046] In the present disclosure, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances.

[0047] In the description of the present disclosure, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the present disclosure.

[0048] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0049] The above are only preferred embodiments of the present disclosure and are not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A reversible oil drain for an oil well, characterized in that: It includes a valve body, a plugging member and an operating rod, wherein both ends of the valve body are used to connect with the oil pipe, the valve body is provided with an oil drain port, the plugging member is arranged inside the valve body, and the plugging member is used to open or close the oil drain port, and the operating rod is connected to the plugging member, wherein: The blocking member has a released state and a retracted state; In the released state, the operating rod can be separated from the valve body; In the retracted state, the operating rod can drive the blocking member to open or close the oil drain port.

2. The reversible oil drain for oil wells according to claim 1, characterized in that: The plugging member includes a plugging member body, a first clamping member and a second clamping member, the plugging member body is used to plug the oil drain port, the first clamping member and the second clamping member are respectively arranged at two ends of the plugging member body, wherein: In the released state, the diameter of the first clamping member or the second clamping member is larger than the diameter of the operating rod; In the folded state, the diameter of the first clamping member or the second clamping member is smaller than the diameter of the operating rod.

3. The reversible oil drain for oil wells according to claim 2, characterized in that: A release groove is provided inside the valve body, and the release groove is provided on the movable paths at both ends of the blocking member, and the release groove is used to make the first clamping member or the first clamping member enter the release state.

4. The reversible oil drain for oil wells according to claim 2, characterized in that: The operating rod is a cylinder, and a protrusion is provided in the middle part of the operating rod in the extending direction, and the protrusion is used to abut against the first clamping member or the second clamping member in the retracted state.

5. The reversible oil drain for oil wells according to claim 1, characterized in that: The first clamping member and the second clamping member are claw springs.

6. The reversible oil drain for oil wells according to claim 1, characterized in that: Connectors are provided at both ends of the valve body, and the connectors are used to be connected to the oil pipe.

7. The reversible oil drain for oil wells according to claim 6, characterized in that: The connecting head is detachably connected to the valve body.

8. The reversible oil drain for oil wells according to any one of claims 1 to 7, characterized in that: A sealing portion is provided on the surface of the blocking member that contacts the inner wall of the valve body. The sealing portion includes a plurality of sealing members that are spaced apart along an extending direction of the blocking member.

9. The reversible oil drain for oil wells according to claim 8, characterized in that: The sealing part includes a first sealing member, a second sealing member and a third sealing member. The first sealing member and the second sealing member are O-ring sealing members, the third sealing member is a trapezoidal sealing member, and the third sealing ring is close to the oil drain port.

10. A method for using a reversible oil drain for an oil well, characterized in that: The following steps are involved: Connecting oil pipes at both ends of the valve body, and connecting the sucker rods in the oil pipes at both ends to the two ends of the operating rod; The operation rod is lowered, and the sucker rod is inserted into the sucker rod to drive the operating rod to move downward so that the blocking member closes the oil drain port; During well repair work, the sucker rod is lifted to drive the operating rod to move upward so that the plugging member opens the oil drain port.

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