A sucker rod sealer for pressure-replacement polished rod

Abstract

The utility model discloses a sucker rod sealer for replacing a light rod under pressure, and relates to the technical field of equipment under pressure. The utility model comprises a shell and a sealing assembly installed on both sides of the shell; the shell comprises a shell, a lower connecting pipe and an upper connecting pipe whose inner cavities are interconnected, the lower connecting pipe is coaxially arranged with the oil pipe and its lower end is connected to the oil well tee, the shell is fixed at the top of the lower connecting pipe, the upper connecting pipe is fixed at the top of the shell and the upper end of the upper connecting pipe is connected to the oil well tee; the sealer is installed on the oil well tee, when replacing the light rod, the bottom end of the light rod is lifted above the sealer, the screw is screwed to drive the sealing strip to slide, so that the sealing strips on both sides clamp the sucker rod, and the flow channel in the oil pipe at the lower end of the light rod is closed under pressure, so as to facilitate the replacement of the light rod, and the light rod is conveniently replaced by the device, the efficiency is increased, the cost is saved, the discharge of crude oil during depressurization, pressure reduction and well washing operations is avoided, and the pollution of formation oil and gas and the ground by clean water well washing is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure-operated equipment, and is a sucker rod sealer for pressure-operated polished rod replacement. Background Art

[0002] The bare rod plays an extremely important role in the oil production process. Its main function is to connect the pumping unit and the sucker rod, and transmit the power of the pumping unit to extract the oil from the ground. Due to long-term work in complex working environment and corrosive media, the bare rod is often damaged and corroded. If it is not replaced in time, it will not only affect the oil production efficiency, but also may cause packing leakage, bare rod breakage, environmental pollution, and increase the labor intensity and safety risks of workers.

[0003] At present, when replacing the polished rod in underground operations, the pressure must be released and reduced first. If the pressure cannot be discharged, it is necessary to wash the well and use the well killing fluid to reduce the wellhead pressure and achieve the purpose of replacing the polished rod. When the pressure in the well is discharged, a large amount of crude oil is lost and there are safety hazards, which will also cause environmental pollution. When discharging the pressure in the well, an outlet control tank must be used. If the pressure cannot be discharged, the well killing fluid must be used, and the cost is always high in this case.

[0004] Therefore, how to provide a sealer capable of replacing a polished rod under pressure is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the utility model aims to provide a sucker rod sealer for replacing a bare rod under pressure to at least to some extent solve the technical problems in the prior art that replacing a bare rod requires shutting down the well, relieving pressure, washing the well, etc., the process of replacing the bare rod is complicated and costly, and is not environmentally friendly.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A sucker rod sealer for replacing a polished rod under pressure is installed at the wellhead of a pumping well. The pumping well comprises an oil pipe, a polished rod, a sucker rod, an oil well spool and an oil well tee. The polished rod and the sucker rod are both lowered into the inner cavity of the oil pipe. The sucker rod is connected to the bottom of the polished rod. The oil well spool is fixed to the lower end of the oil pipe corresponding to the sucker rod. The oil well tee is fixed to the oil pipe corresponding to the upper part of the oil well spool. The seal comprises: an outer shell and sealing components installed on both sides of the outer shell.

[0008] The outer shell comprises a shell, a lower connecting pipe and an upper connecting pipe whose inner cavities are interconnected, the lower connecting pipe is coaxially arranged with the oil pipe and its lower end is connected to the oil well tee, the shell is fixed to the top of the lower connecting pipe, the upper connecting pipe is fixed to the top of the shell and its upper end is connected to the oil well tee;

[0009] The sealing assembly includes a lead screw, a transmission sleeve, a sealing plate and a sealing strip. The lead screw is arranged along the radial direction of the oil pipe and is rotatably installed on the side wall of the shell, and one end of the lead screw extends to the outside of the shell, and the other end extends to the inner cavity of the shell; one end of the transmission sleeve is transmission-connected to the other end of the lead screw, the sealing plate surface is arranged along the radial direction of the oil pipe and one side end of the sealing plate is connected to the other end of the transmission sleeve, the sealing strip is installed on the other side end of the sealing plate, and the sealing strip can fit tightly on the outer side wall of the sucker rod to block the oil flow channel in the oil pipe.

[0010] The beneficial effects that can be achieved by the utility model are as follows: the sealer is installed on the oil well spool corresponding to the polished rod. When replacing the polished rod, the bottom end of the polished rod is lifted above the sealer, and the sealing plates are driven to slide by the lead screws on both sides, so that the sealing strips on both sides clamp the sucker rod, and the flow channel in the oil pipe at the lower end of the polished rod is closed under pressure, thereby facilitating the replacement of the polished rod. The device is convenient for replacing the polished rod, increases efficiency, saves costs, avoids the discharge of crude oil during depressurization, pressure reduction, and well washing operations, and reduces the pollution of formation oil and gas and the ground by clean water well washing.

[0011] Preferably, the lower outer wall of the lower connecting pipe is provided with an external thread, the upper part of the oil well cross is provided with an internal thread, and the lower connecting pipe is threadedly connected to the oil well cross.

[0012] Preferably, the upper inner wall of the upper connecting pipe is provided with an internal thread, the lower outer wall of the oil well tee is provided with an external thread, and the upper connecting pipe is threadedly connected to the oil well tee.

[0013] Preferably, a plug hole arranged parallel to the axial direction of the oil pipe is formed at one end of the transmission sleeve away from the screw, and a plug rod pluggable with the plug hole is fixed on the sealing plate.

[0014] Preferably, the sealing plate includes a lower sealing plate and an upper pressure plate, the insert rod is fixed to one end of the lower sealing plate close to the lead screw, and a mounting groove penetrating through the top wall of the lower sealing plate is provided on the side away from the lead screw, and one side end of the sealing strip is installed in the mounting groove and fixed by the upper pressure plate.

[0015] Preferably, the sealing strip has a curved surface adapted to the outer side wall of the sucker rod.

[0016] Preferably, the cross-section of the lead screw extending to one end outside the housing is hexagonal.

[0017] Preferably, a driving part is further provided, and the driving part includes a handle, and the handle is installed at one end of the lead screw extending outside the housing.

[0018] It can be seen from the above technical scheme that compared with the prior art, the utility model discloses a sucker rod sealer for replacing a bare rod under pressure, which has the following beneficial effects: the utility model can be detachably installed between the oil well four-way and the oil well three-way. When replacing the bare rod, the bare rod is lifted so that its bottom end is placed above the sealer. At this time, the sucker rod is clamped by the sealing assembly to block the channel at the lower end of the sucker rod. The bare rod can be directly replaced, so that there is no need to release pressure when replacing the bare rod, which solves the problem of long operation time, labor and material resources consumption and high cost of traditional bare rod replacement. At the same time, there is no need to wash the well, which is beneficial to protecting the environment, preventing pollution, ensuring safe production, and improving physical efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model 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, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 The utility model is a structural schematic diagram of the installation state of a sucker rod sealer for a pressure-changing light rod provided by the utility model.

[0021] Figure 2 The utility model provides a front view of a half-section structure schematic diagram of a sucker rod sealer for a pressure-changing light rod.

[0022] Figure 3 The utility model provides a top view of a half-section structure of a sucker rod sealer for a pressure-changing light rod.

[0023] Figure 4 The utility model provides a schematic top view of the structure of a sucker rod sealer for a pressure-changing light rod.

[0024] In the figure: 1, oil pipe, 2, bare rod, 3, sucker rod, 4, sealer, 411, housing, 412, lower connecting pipe, 413, upper connecting pipe, 42, sealing assembly, 421, lead screw, 42,2, transmission sleeve, 423, sealing plate, 4231, lower sealing plate, 4232, upper pressure plate, 424, sealing strip, 425, plug rod, 5, oil well cross, 6, oil well tee, 7, handle. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] See also Figure 1-Figure 4 The utility model discloses a sucker rod sealer for replacing a polished rod under pressure, which is installed at the wellhead of a pumping well. The pumping well includes an oil pipe 1, a polished rod 2, a sucker rod 3, an oil well spool 5 and an oil well tee 6. The polished rod 2 and the sucker rod 3 are both lowered into the inner cavity of the oil pipe 1. The sucker rod 3 is connected to the bottom of the polished rod 2. The oil well spool 5 is fixed at the lower end of the oil pipe 1 corresponding to the sucker rod 3. The oil well tee 6 is fixed on the oil pipe 1 above the corresponding oil well spool 5, and includes: a housing 41 and sealing components 42 installed on both sides of the housing 41;

[0029] The housing 41 includes a shell 411, a lower connecting pipe 412 and an upper connecting pipe 413, the inner cavities of which are interconnected. The lower connecting pipe 412 is coaxially arranged with the oil pipe 1 and its lower end is connected to the oil well tee 5. The shell 411 is fixed to the top of the lower connecting pipe 412. The upper connecting pipe 413 is fixed to the top of the shell 411 and its upper end is connected to the oil well tee 6.

[0030] The sealing assembly 42 includes a screw 421, a transmission sleeve 422, a sealing plate 423 and a sealing strip 424. The screw 421 is arranged along the radial direction of the oil pipe 1 and is rotatably installed on the side wall of the shell 411, and one end of the screw 421 extends to the outside of the shell 411, and the other end extends to the inner cavity of the shell 411; one end of the transmission sleeve 422 is transmission-connected to the other end of the screw 421, the sealing plate 423 is arranged along the radial direction of the oil pipe 1 and one side end of the sealing plate 423 is connected to the other end of the transmission sleeve 422, the sealing strip 424 is installed on the other side end of the sealing plate 423, and the sealing strip 424 can fit tightly on the outer side wall of the sucker rod 3.

[0031] The beneficial effects that can be achieved by the utility model are as follows: the device is installed on the oil well spool 5 corresponding to the bottom end of the polished rod 2, and the transmission sleeve 422 is driven to move by the lead screws 421 on both sides, thereby driving the sealing plate 423 to slide, so that the sealing strips 424 on both sides clamp the sucker rod 3, and the flow channel in the oil well tubing 1 at the lower end of the polished rod 2 is closed under pressure, thereby facilitating the replacement of the polished rod 2. The device makes it convenient to replace the polished rod 2, increases efficiency, saves costs, avoids the discharge of crude oil during depressurization, pressure reduction, and well washing operations, and reduces the pollution of formation oil and gas by clean water well washing.

[0032] In a specific embodiment, the lower outer wall of the lower connecting pipe 412 is provided with an external thread, the upper flange of the oil well spool 5 is provided with an internal thread, and the lower connecting pipe 412 is threadedly connected to the oil well spool 5.

[0033] In a specific embodiment, the upper inner wall of the upper connecting pipe 413 is provided with internal threads, the lower flange of the oil well tee 6 is provided with external threads, and the upper connecting pipe 413 is threadedly connected to the oil well tee 6. The sealer is easy to assemble and disassemble.

[0034] In a specific embodiment, a plug hole parallel to the axial direction of the oil pipe 1 is formed at one end of the transmission sleeve 422 away from the lead screw 421 , and an insert rod 425 pluggably engaged with the plug hole is fixed on the sealing plate 423 .

[0035] In a specific embodiment, the sealing plate 423 includes a lower sealing plate 4231 and an upper pressing plate 4232, the insert rod 425 is fixed to one end of the lower sealing plate 4231 close to the lead screw 421, the lower sealing plate 4231 is provided with a mounting groove that runs through its top wall on one side away from the lead screw 421, one side end of the sealing strip 424 is installed in the mounting groove and fixed by the upper pressing plate 4232, and the upper pressing plate 4233 is fixed to the lower pressing plate by bolts. Both the sealing plate 423 and the sealing strip 424 are detachable for easy replacement.

[0036] In a specific embodiment, the sealing strip 424 has an arc-shaped surface adapted to the outer side wall of the sucker rod 3. The matching sealing strip 424 can be replaced according to the sucker rod 3 of different oil wells.

[0037] In a specific embodiment, the cross section of the lead screw 421 extending to one end outside the housing 411 is hexagonal. The sealer can be driven manually, and the lead screw 421 can be screwed with a wrench.

[0038] In a specific embodiment, a driving unit is further provided. The driving unit includes a handle 7 . The handle 7 is installed at one end of the lead screw 421 extending outside the housing 411 .

[0039] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0040] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sucker rod sealer for replacing a polished rod under pressure, installed at the wellhead of an oil well, the oil well comprising an oil pipe (1), a polished rod (2), a sucker rod (3), an oil well spool (5) and an oil well tee (6), the polished rod (2) and the sucker rod (3) are both lowered into the inner cavity of the oil pipe (1), the sucker rod (3) is connected to the bottom of the polished rod (2), the oil well spool (5) is fixed to the lower end of the oil pipe (1) corresponding to the sucker rod (3), the oil well tee (6) is fixed to the oil pipe (1) above the oil well spool (5), characterized in that: include: A housing (41) and sealing assemblies (42) mounted on both sides of the housing (41); The outer shell (41) comprises a shell (411), a lower connecting pipe (412) and an upper connecting pipe (413) whose inner cavities are interconnected; the lower connecting pipe (412) is coaxially arranged with the oil pipe (1) and its lower end is connected to the oil well tee (5); the shell (411) is fixed to the top of the lower connecting pipe (412); the upper connecting pipe (413) is fixed to the top of the shell (411) and its upper end is connected to the oil well tee (6); The sealing assembly (42) comprises a lead screw (421), a transmission sleeve (422), a sealing plate (423) and a sealing strip (424); the lead screw (421) is arranged along the radial direction of the oil pipe (1) and is rotatably mounted on the side wall of the shell (411), and one end of the lead screw extends to the outside of the shell (411), and the other end extends to the inner cavity of the shell (411); one end of the transmission sleeve (422) is transmission-connected to the other end of the lead screw (421); the sealing plate (423) is arranged along the radial direction of the oil pipe (1) and one end of the sealing plate is connected to the other end of the transmission sleeve (422); the sealing strip (424) is mounted on the other side end of the sealing plate (423), and the sealing strip (424) can be tightly fitted on the outer side wall of the sucker rod (3) to block the oil flow channel in the oil pipe (1).

2. The sucker rod sealer for a pressure-replacement rod according to claim 1, characterized in that: The lower outer wall of the lower connecting pipe (412) is provided with an external thread, the upper part of the oil well spool (5) is provided with an internal thread, and the lower connecting pipe (412) is threadedly connected to the oil well spool (5).

3. The sucker rod sealer for a pressure-replacement rod according to claim 1, characterized in that: The upper inner wall of the upper connecting pipe (413) is provided with an internal thread, and the lower outer wall of the oil well tee (6) is provided with an external thread. The upper connecting pipe (413) is threadedly connected to the oil well tee (6).

4. The sucker rod sealer for a pressure-replacement rod according to claim 1, characterized in that: The transmission sleeve (422) is provided with a plug hole arranged parallel to the axial direction of the oil pipe (1) at one end away from the lead screw (421), and a plug rod (425) pluggably engaged with the plug hole is fixed on the sealing plate (423).

5. The sucker rod sealer for a pressure-replacement rod according to claim 4, characterized in that: The sealing plate (423) comprises a lower sealing plate (4231) and an upper pressure plate (4232); the insertion rod (425) is fixed to one end of the lower sealing plate (4231) close to the lead screw (421); a mounting groove penetrating through the top wall of the lower sealing plate (4231) is provided on the side away from the lead screw (421); one end of the sealing strip (424) is mounted in the mounting groove and fixed by the upper pressure plate (4232).

6. The sucker rod sealer for a pressure-replacement rod according to claim 1, characterized in that: The sealing rubber strip (424) has an arc-shaped surface adapted to the outer side wall of the sucker rod (3).

7. The sucker rod sealer for a pressure-replacement rod according to claim 1, characterized in that: The cross section of one end of the lead screw (421) extending outside the housing (411) is hexagonal.

8. The sucker rod sealer for a pressure-replacement rod according to claim 1, characterized in that: A driving unit is also provided, the driving unit comprising a handle (7), the handle (7) being mounted on one end of the lead screw (421) extending outside the housing (411).

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