Three-stage sealing device for swabbing
By using a three-stage sealing device in the oil extraction process, and utilizing a multi-layer sealing structure and drainage pipe design, the problems of well fluid splashing and seal wear are solved, achieving efficient well fluid recovery and seal durability.
Patent Information
- Application Number
- CN202520153975.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2035-01-22
AI Technical Summary
During oil extraction, the wellhead is not properly sealed when using traditional wire rope pumping, causing well fluid to splash and pollute the environment. In addition, the seal will wear out faster under pressure in windy weather, affecting operations.
Design a three-stage sealing device, including primary, secondary and tertiary sealing structures, to process and discharge the produced fluid step by step through primary, secondary and tertiary drainage pipes respectively, and to reduce well fluid splashing and wear by using a conical structure and return spring design.
It achieved 100% recovery of well fluid, reduced surface pollution, avoided excessive wear of seals, and ensured smooth lifting and lowering of the wire rope.
Smart Images
Figure CN223621568U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of oil extraction technology, and in particular to a three-stage sealing device for pumping during oil extraction. Background Technology
[0002] During oil extraction, traditional wire rope pumping often results in poor sealing of the blowout preventer (BOP) at the wellhead, with only one layer of seal. This causes some of the produced fluid to splash near the wellhead, while some, unable to enter the pipeline, is thrown onto the ground along the wire rope's path, causing environmental pollution. Windy weather exacerbates the pollution. Furthermore, excessive pressure applied to tighten the BOP packing can obstruct the wire rope's movement and accelerate packing wear until it loses its sealing ability, requiring replacement.
[0003] Therefore, based on the above-mentioned technical problems, those skilled in the art urgently need to develop a three-stage sealing device for pumping in the oil extraction process. Utility Model Content
[0004] The purpose of this invention is to provide a three-stage sealing device for pumping in oil extraction. This three-stage sealing device can solve the problem of well fluid splashing out from the wellhead sealing device as the steel wire rope is lifted during pumping operations, reducing ground pollution and achieving a 100% well fluid recovery rate.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] This utility model discloses a three-stage sealing device for pumping, the three-stage sealing device comprising:
[0007] The drain pipe connected to the wire spool of the sealing device; and
[0008] A three-layer sealing structure is integrated inside the wire drum, and the three-layer sealing structure is arranged sequentially according to the lifting path of the wire rope.
[0009] The drain pipe includes a primary drain pipe, a secondary drain pipe, and a tertiary drain pipe;
[0010] The three-layer sealing structure includes a primary sealing structure, a secondary sealing structure, and a tertiary sealing structure;
[0011] The primary drain pipe is connected to the lower end of the wire drum, and the liquid produced during the wire rope lifting process is discharged through the primary drain pipe after being treated by the primary sealing structure.
[0012] The secondary drain pipe is connected to the middle of the wire drum, and the liquid produced during the wire rope lifting process is discharged through the secondary drain pipe after being treated by the secondary sealing structure.
[0013] The three-stage drainage pipe is connected to the upper part of the wire drum, and the liquid produced during the wire rope lifting process is discharged through the three-stage drainage pipe after being treated by the three-stage sealing structure.
[0014] Furthermore, the position where the wire drum mates with the primary sealing structure is connected in the horizontal direction to a feed operation cylinder.
[0015] Furthermore, both ends of the feed operation cylinder are equipped with feed handles, and a wedge block is provided inside the feed operation cylinder that is connected to the feed handle on the corresponding side and driven to move by the feed handle.
[0016] Furthermore, the primary sealing structure is located at the transition position between the wire drum and the feed operating drum, and the primary sealing structure is located between the wedge blocks on both sides;
[0017] The primary sealing structure includes:
[0018] The primary sealing body and the primary packing located inside the primary sealing body.
[0019] Furthermore, the secondary sealing structure includes:
[0020] Secondary sealing body and secondary packing located inside the secondary sealing body;
[0021] A lower return spring for the secondary seal is installed at the lower end of the secondary seal, and an upper return spring for the secondary seal is installed at the upper end of the secondary seal.
[0022] Furthermore, the interior of the secondary seal is configured as a tapered structure with a cross-sectional dimension that gradually decreases from bottom to top;
[0023] The secondary packing is matched with the internal structure of the secondary seal.
[0024] Furthermore, the three-stage sealing structure includes:
[0025] A third-level seal and a third-level packing located inside the third-level seal;
[0026] A lower return spring for the third-stage sealing body is installed at the lower end of the third-stage sealing body, and an upper return spring for the third-stage sealing body is installed at the upper end of the third-stage sealing body.
[0027] Furthermore, the interior of the three-stage sealing body is configured as a conical structure with a cross-sectional dimension that gradually decreases from bottom to top;
[0028] The three-stage packing is matched with the internal structure of the three-stage sealing body.
[0029] Furthermore, one end of the secondary drain pipe is connected to the wire drum, and the other end is connected to the primary drain pipe through a secondary manifold, and a valve is installed on the secondary drain pipe.
[0030] Furthermore, one end of the tertiary drain pipe is connected to the wire drum, and the other end is connected to the secondary drain pipe through the tertiary manifold, with the connection point located upstream of the valve of the secondary drain pipe.
[0031] A valve is installed on the three-stage manifold.
[0032] In the above technical solution, the three-stage sealing device for pumping provided by this utility model has the following beneficial effects:
[0033] The three-stage sealing device of this invention can solve the problem of well fluid splashing out from the wellhead sealing device as the steel wire rope is lifted during pumping operations, reducing ground pollution and achieving a 100% well fluid recovery rate. Attached Figure Description
[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.
[0035] Figure 1 This is a schematic diagram of the three-stage sealing device for pumping disclosed in the embodiments of this application;
[0036] Figure 2 This is a cross-sectional view of the three-stage sealing device for pumping disclosed in an embodiment of this application.
[0037] Explanation of reference numerals in the attached figures:
[0038] 101. Primary drain pipe; 102. Secondary drain pipe; 103. Tertiary drain pipe;
[0039] 201. Tertiary manifold; 202. Secondary manifold;
[0040] 301. Primary sealing structure; 302. Secondary sealing structure; 303. Tertiary sealing cover structure;
[0041] 401. Wire drum; 402. Feed control cylinder; 403. Feed handle; 404. Wedge block;
[0042] 501. Upper return spring of the secondary seal body; 502. Lower return spring of the secondary seal body;
[0043] 601. Upper return spring of the third-stage seal; 602. Lower return spring of the third-stage seal. Detailed Implementation
[0044] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.
[0045] See Figures 1 to 2 As shown;
[0046] This embodiment discloses a three-stage sealing device for pumping, the three-stage sealing device comprising:
[0047] The drain pipe connected to the wire spool 401 of the sealing device; and
[0048] A three-layer sealing structure is integrated into the wire drum 401, and the three-layer sealing structure is arranged sequentially according to the lifting path of the wire rope.
[0049] The drainage pipe includes a primary drainage pipe 101, a secondary drainage pipe 102, and a tertiary drainage pipe 103;
[0050] The three-layer sealing structure includes a primary sealing structure 301, a secondary sealing structure 302, and a tertiary sealing structure 303.
[0051] The primary drain pipe 101 is connected to the lower end of the wire drum 401, and the liquid produced during the wire rope lifting process is discharged through the primary drain pipe 101 after being treated by the primary sealing structure 301.
[0052] The secondary drain pipe 102 is connected to the middle of the wire drum 401, and the liquid produced during the wire rope lifting process is discharged through the secondary drain pipe 102 after being treated by the secondary sealing structure 302.
[0053] The three-stage drain pipe 103 is connected to the upper part of the wire drum 401, and the liquid produced during the wire rope lifting process is discharged through the three-stage sealing structure 303 after being treated by the three-stage sealing structure 303.
[0054] Specifically, the sealing device in this embodiment integrates a three-layer sealing structure, namely the primary sealing structure 301, the secondary sealing structure 302, and the tertiary sealing structure 303 mentioned above. The three-layer sealing structure is arranged sequentially along the wire rope lifting path. Through the separate processing of the three layers of sealing structure, the produced liquid is discharged into the wastewater collection tank through the three drainage pipes mentioned above. Because the device of this application is equipped with a three-layer sealing structure, the discharge of the produced liquid during wire rope lifting can be maximized.
[0055] Preferably, in this embodiment, the position where the wire spool 401 mates with the primary sealing structure 301 is connected to a feed operating cylinder 402 in the horizontal direction. Both ends of the feed operating cylinder 402 are equipped with feed handles 403, and a wedge block 404 is provided inside the feed operating cylinder 402, which is connected to the feed handle 403 on the corresponding side and is driven to move by the feed handle 403.
[0056] In this embodiment, the primary sealing structure 301 is located at the transition position between the wire drum 401 and the feed operation drum 402, and the primary sealing structure 301 is located between the wedge blocks 404 on both sides; the primary sealing structure 301 includes a primary sealing body and a primary packing located inside the primary sealing body.
[0057] This embodiment, combining the structure of the feed operating cylinder 402 and the primary sealing structure 301, further describes the specific operation and principle when the wire rope enters the primary sealing structure 301. When the pumping wire rope first passes through the primary sealing structure 301, the primary packing inside the primary sealing body is scraped off, and most of the well fluid flows into the modified primary drainage pipe 101 and enters the sewage collection tank. If the lower wire rope is repeatedly lifted, and the hole in the primary packing is excessively worn, the feed handles 403 on both sides can be directly twisted. The feed handles 403 push the symmetrical wedge blocks 404 at the bottom of the primary packing to move and generate pressure, pressing the primary packing again, reducing the inner hole of the primary packing, gripping the wire rope, and restoring the ability to scrape well fluid from the wire rope.
[0058] Preferably, the secondary sealing structure 302 in this embodiment includes a secondary sealing body and a secondary packing located inside the secondary sealing body;
[0059] A lower return spring 502 is installed at the lower end of the secondary seal body, and an upper return spring 501 is installed at the upper end of the secondary seal body.
[0060] After the wire rope enters the secondary sealing body, it is scraped by the secondary packing to remove some of the residual well fluid carried by the wire rope. The pressure of the well fluid generated during the upward movement of the pump is controlled for the second time. The scraped well fluid flows into the primary drain pipe 101 through the secondary drain pipe 102 and then into the sewage collection tank.
[0061] Preferably, in this embodiment, the interior of the secondary seal is configured as a tapered structure with the cross-sectional dimensions gradually decreasing from bottom to top; the secondary packing is matched with the internal structure of the secondary seal.
[0062] In this embodiment, the secondary sealing body is designed with an internal cone shape that is smaller at the top and larger at the bottom. The external structure of the secondary packing matches the internal structure of the secondary sealing body. The secondary packing can move up and down a short distance with the wire rope during lifting and lowering. During lifting, it is drawn into the smaller upper cone by the friction resistance, and the central hole is reduced to narrow the sealing opening, which can control the well fluid gushing and splashing, and control the external pressure of the well fluid. During lowering, it is drawn into the larger lower cone space by the friction resistance, and the central hole becomes larger, so it will not generate friction resistance during lowering. The secondary packing is equipped with return springs at the top and bottom to assist in the return of the packing to its original position.
[0063] Preferably, the three-stage sealing structure 303 of this embodiment includes a three-stage sealing body and a three-stage packing located inside the three-stage sealing body; a lower return spring 602 of the three-stage sealing body is installed at the lower end of the three-stage sealing body, and an upper return spring 601 of the three-stage sealing body is installed at the upper end of the three-stage sealing body.
[0064] In this embodiment, the three-stage sealing body is configured as a tapered structure with the cross-sectional dimensions gradually decreasing from bottom to top; the three-stage packing is matched with the three-stage sealing body structure.
[0065] When the wire rope enters the third-stage sealing body, it replicates the same structure inside the second-stage sealing body, resulting in the same effect. The external pressure of the well fluid is gradually reduced until it is eliminated. Most of the well fluid carried is scraped away by the first stage, and more than 80% is scraped away by the second stage. The pressure of the well fluid is further reduced until the pressure inside the third-stage sealing body is reduced three times. The well fluid carried by the wire rope has been 100% scraped away and enters the drainage gate, flowing into the sewage collection tank.
[0066] Although it undergoes three pressure-controlled scraping processes, the structural design of the secondary and tertiary sealed bodies ensures that the lifting and lowering of the extraction wire rope is not affected by friction.
[0067] Preferably, in this embodiment, one end of the secondary drain pipe 102 is connected to the wire drum 401, and the other end is connected to the primary drain pipe 101 through the secondary manifold 202, and a valve is installed on the secondary drain pipe 102.
[0068] One end of the tertiary drain pipe 103 is connected to the wire drum 401, and the other end is connected to the secondary drain pipe 102 through the tertiary manifold 201. The connection point is located at the upstream end of the valve of the secondary drain pipe 102.
[0069] A valve is installed on the three-stage manifold 201.
[0070] In the above technical solution, the three-stage sealing device for pumping provided by this utility model has the following beneficial effects:
[0071] The three-stage sealing device of this invention can solve the problem of well fluid splashing out from the wellhead sealing device as the steel wire rope is lifted during pumping operations, reducing ground pollution and achieving a 100% well fluid recovery rate.
[0072] Compared with traditional pumping devices, the three-stage sealing device of this utility model can continuously adjust the handle of the first-stage sealing body to press the first-stage packing. The second and third-stage sealing bodies allow the steel wire rope to adjust the center hole of the packing independently during the lifting and lowering process, avoiding excessive wear caused by simply pressing the packing to reduce the center hole and increasing the friction during lifting and lowering. At the same time, with the support of upper and lower return springs, the packing will not get stuck in the cone. The design is ingenious.
[0073] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.
Claims
1. A three-stage sealing device for pumping, characterized in that, The three-stage sealing device includes: A drain pipe connected to the wire spool (401) of the sealing device; and A three-layer sealing structure is integrated within the wire drum (401), and the three-layer sealing structure is arranged sequentially according to the lifting path of the wire rope; The drain pipe includes a primary drain pipe (101), a secondary drain pipe (102), and a tertiary drain pipe (103); The three-layer sealing structure includes a primary sealing structure (301), a secondary sealing structure (302), and a tertiary sealing structure (303); The primary drain pipe (101) is connected to the lower end of the wire drum (401), and the liquid produced during the wire rope lifting process is discharged through the primary drain pipe (101) after being treated by the primary sealing structure (301). The secondary drain pipe (102) is connected to the middle of the wire drum (401), and the liquid produced during the wire rope lifting process is discharged through the secondary drain pipe (102) after being treated by the secondary sealing structure (302). The three-stage drain pipe (103) is connected to the upper part of the wire drum (401), and the liquid produced during the wire rope lifting process is discharged through the three-stage sealing structure (303) after being treated.
2. The three-stage sealing device for pumping according to claim 1, characterized in that, The position where the wire spool (401) mates with the primary sealing structure (301) is connected in the horizontal direction to the feed operation cylinder (402).
3. The three-stage sealing device for pumping according to claim 2, characterized in that, Both ends of the feed operation cylinder (402) are equipped with feed handles (403). The feed operation cylinder (402) is provided with a wedge block (404) that is connected to the feed handle (403) on the corresponding side and is driven to move by the feed handle (403).
4. The three-stage sealing device for pumping according to claim 3, characterized in that, The primary sealing structure is located at the transition position between the wire drum (401) and the feed operation drum (402), and the primary sealing structure (301) is located between the wedge blocks (404) on both sides. The primary sealing structure (301) includes: The primary sealing body and the primary packing located inside the primary sealing body.
5. A three-stage sealing device for pumping according to claim 1, characterized in that, The secondary sealing structure (302) includes: Secondary sealing body and secondary packing located inside the secondary sealing body; The lower end of the secondary seal is equipped with a lower return spring (502), and the upper end of the secondary seal is equipped with an upper return spring (501).
6. A three-stage sealing device for pumping according to claim 5, characterized in that, The interior of the secondary seal is configured as a tapered structure with cross-sectional dimensions gradually decreasing from bottom to top; The secondary packing is matched with the internal structure of the secondary seal.
7. A three-stage sealing device for pumping according to claim 1, characterized in that, The three-stage sealing structure (303) includes: A third-level seal and a third-level packing located inside the third-level seal; The lower end of the three-stage sealing body is equipped with a lower return spring (602), and the upper end of the three-stage sealing body is equipped with an upper return spring (601).
8. A three-stage sealing device for pumping according to claim 7, characterized in that, The interior of the three-stage seal is configured as a tapered structure with the cross-sectional dimensions gradually decreasing from bottom to top; The three-stage packing is matched with the internal structure of the three-stage sealing body.
9. A three-stage sealing device for pumping according to claim 1, characterized in that, One end of the secondary drain pipe (102) is connected to the wire drum (401), and the other end is connected to the primary drain pipe (101) through the secondary manifold (202). A valve is installed on the secondary drain pipe (102).
10. A three-stage sealing device for pumping according to claim 9, characterized in that, One end of the tertiary drain pipe (103) is connected to the wire spool (401), and the other end is connected to the secondary drain pipe (102) through the tertiary manifold (201), with the connection point located upstream of the valve of the secondary drain pipe (102). A valve is installed on the three-stage manifold (201).