A wellhead crude oil sealing and recovering device for oilfield workover

Abstract

The utility model relates to oilfield technical field, and disclose a kind of wellhead crude oil sealing recovery device for oilfield workover, including support seat and two recovery covers, the inner bottom wall of support seat is equipped with electric cylinder, the telescopic end of electric cylinder is equipped with lifting plate, the bottom surface of lifting plate is equipped with connecting column, the bottom end of connecting column is connected with sealing plug plate, the lower portion of sealing plug plate is provided with wellhead pipe, the outer surface of sealing plug plate and the inner ring of wellhead pipe are closely contacted. By electric cylinder drive sealing plug plate and wellhead pipe inner ring closely contact to form the first inner sealing, then drive two recovery covers to close by opening and closing drive mechanism, utilize upper arc sealing gasket, lower arc sealing gasket respectively stick connecting column and wellhead pipe outer surface, form multidirectional sealing, solve the problem that traditional operation uses packing, sealing pad and other simple materials manual compaction, sealing effect is unstable and is susceptible to pressure fluctuation, pipe string up and down clearance influence leakage frequently.

Description

Technical Field

[0001] This utility model relates to the field of oilfield technology, specifically to a wellhead crude oil sealing and recovery device for oilfield well workover. Background Technology

[0002] Oilfield well workover is a key technical operation to ensure the normal production of oil wells during oilfield development. It mainly targets downhole faults that occur in production wells and water injection wells during operation. Through methods such as running tubing, replacing downhole tools, repairing casing, and cleaning oil layers, it restores or increases the production capacity of oil wells. At the same time, it carries out preparatory work for oil testing and production of newly drilled wells, which is a link to maintain the continuity of oilfield development.

[0003] In traditional well workover operations, crude oil is prone to leakage from the wellhead seal due to wellhead pressure fluctuations and gaps created by tubing string tripping. Traditional manual plugging uses simple materials such as packing and gaskets for manual compaction, and the sealing effect is greatly affected by the operator's skill level, resulting in frequent leakage. This not only wastes crude oil resources but also pollutes the soil and water at the well site. More importantly, traditional methods lack a corresponding recovery structure, and leaked crude oil is directly discharged, requiring a large investment of manpower and resources for subsequent cleanup, which does not comply with current stringent environmental emission standards. Therefore, we propose a wellhead crude oil sealing and recovery device for oilfield well workover. Summary of the Invention

[0004] The purpose of this utility model is to provide a wellhead crude oil sealing and recovery device for oilfield well workover, in order to solve the problems mentioned in the background technology. Traditional manual plugging uses simple materials such as packing and gaskets for manual compaction, and the sealing effect is greatly affected by the operator's skill level. Frequent leakage from gaps not only wastes crude oil resources, but also pollutes the soil and water at the well site. More importantly, the traditional method does not have a matching recovery structure, and the leaked crude oil is directly discharged, requiring a large amount of manpower and resources for subsequent cleanup.

[0005] This utility model provides the following technical solution: a wellhead crude oil sealing and recovery device for oilfield well workover, comprising a support base and two recovery covers. An electric cylinder is installed on the inner bottom wall of the support base. A lifting plate is installed on the telescopic end of the electric cylinder. A connecting column is installed on the bottom surface of the lifting plate. A sealing plug is connected to the bottom end of the connecting column. A wellhead pipe is arranged below the sealing plug. The outer surface of the sealing plug is in close contact with the inner ring of the wellhead pipe. A recovery box is installed on one side of the support base. Two recovery hoses are connected to one side of the recovery box. One end of each of the two recovery hoses passes through the recovery cover and extends into the interior of the recovery cover. The two recovery covers are located outside the wellhead pipe. An opening and closing drive mechanism is provided on one side of the support base.

[0006] Preferably, the opening and closing drive mechanism includes a drive slide mounted on one side of the support base. A dual-axis motor is mounted on the inner wall of the drive slide. A transmission screw is fixedly mounted on each of the two output ends of the dual-axis motor. Threaded transmission tubes are threadedly connected to the outer surfaces of the two transmission screws. A transmission connecting plate is connected to one end of each of the two threaded transmission tubes. The sides of the two transmission connecting plates that are close to each other are respectively connected to the sides of the two recycling hoods. Two limiting sliding holes are opened on one side of the drive slide. Limiting sliders are slidably connected to the inner walls of the two limiting sliding holes. One side of each of the two limiting sliders is respectively connected to the side of the two recycling hoods, and the other side of each of the two limiting sliders is respectively connected to the side of the two threaded transmission tubes.

[0007] Preferably, the upper surface of the opening and closing drive mechanism is connected to a limiting slide, and the inner wall of the limiting slide is slidably connected to two limiting slide plates, one side of each of the two limiting slide plates being connected to one side of each of the two transmission connecting plates.

[0008] Preferably, both sides of the support base are connected to limit sliding covers, and the interior of each of the two limit sliding covers is slidably connected to a limit upright plate. The top of each of the two limit upright plates is connected to the bottom surface of the lifting plate.

[0009] Preferably, the inner walls of the two recovery covers are respectively inlaid with an upper arc-shaped sealing gasket and a lower arc-shaped sealing gasket. The side of the two upper arc-shaped sealing gaskets that are close to each other are in close contact with the outer surface of the connecting column. The side of the two lower arc-shaped sealing gaskets that are close to each other are in contact with the outer surface of the wellhead pipe. The side of the two recovery covers that are close to each other is inlaid with a U-shaped sealing gasket. The side of the two U-shaped sealing gaskets that are close to each other are in contact.

[0010] Preferably, a liquid level observation plate is embedded on one side of the recycling tank, and a discharge valve is connected to one side of the recycling tank.

[0011] This utility model has the following beneficial effects: I. This wellhead crude oil sealing and recovery device for well workover in this oilfield uses an electric cylinder to drive a sealing plug plate to make tight contact with the inner ring of the wellhead pipe, forming the first internal seal. Then, the opening and closing drive mechanism drives two recovery covers to close. The upper and lower arc-shaped sealing gaskets are respectively attached to the connecting column and the outer surface of the wellhead pipe, and the U-shaped sealing gasket achieves a sealing of the mating surface, forming a multi-directional seal. The double sealing structure is not affected by human operation factors, and the limiting slider, limiting slide plate and other components ensure a stable and precise sealing process. Even in the face of wellhead pressure fluctuations, it can maintain a good sealing state, reduce the risk of leakage, and solve the drawbacks of traditional manual plugging that depends on the operator's skill, as well as the problems of traditional operations using simple materials such as packing and sealing gaskets for manual compaction, which have unstable sealing effects and are easily affected by pressure fluctuations and the gap between the tubing string and the pipe string, resulting in frequent leakage.

[0012] II. The wellhead crude oil sealing and recovery device for well workover in this oilfield forms a closed cavity around the wellhead pipe through two recovery hoods, which can collect leaked crude oil. The crude oil is then guided into the recovery tank through a recovery hose. The liquid level observation plate can monitor the recovery volume in real time, and the discharge valve facilitates the discharge and reuse of crude oil. At the same time, the closed recovery mode avoids direct contact between crude oil and soil and water, controlling pollution from the source of discharge. It eliminates the need for additional large-scale cleanup costs and solves the problems of traditional methods that lack supporting recovery structures, resulting in the direct discharge of leaked crude oil, causing a large waste of crude oil resources, polluting the soil and water at the well site, and requiring a large investment of manpower and resources for subsequent cleanup, which is difficult to meet environmental standards. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention viewed from the front; Figure 2 This is a frontal sectional view of the recycling hood of this utility model; Figure 3 This is a three-dimensional structural diagram of the rear view of this utility model; Figure 4 This is a top-view three-dimensional structural diagram of the opening and closing drive mechanism in this utility model; Figure 5 This is a side view of the three-dimensional structure of the recycling hood in this utility model.

[0014] In the diagram: 1. Support base; 2. Lifting plate; 3. Connecting column; 4. Recovery cover; 5. Upper arc-shaped sealing gasket; 6. Lower arc-shaped sealing gasket; 7. Wellhead pipe; 8. Sealing plug plate; 9. Opening and closing drive mechanism; 91. Drive slide; 92. Dual-axis motor; 93. Transmission screw; 94. Threaded transmission pipe; 95. Limiting slider; 96. Limiting sliding hole; 10. Transmission connecting plate; 11. Recovery box; 12. Recovery hose; 13. Electric cylinder; 14. Limiting sliding cover; 15. Limiting vertical plate; 16. Discharge valve; 17. Limiting slide; 18. Limiting sliding plate; 19. U-shaped sealing gasket; 20. Liquid level observation plate. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Example 1: This example aims to address the problem of traditional manual plugging, which relies on simple materials such as packing and gaskets for manual compaction. The sealing effect is greatly affected by the operator's skill level, leading to frequent leaks and wasting crude oil resources while polluting the well site soil and water. Please refer to [link / reference]. Figures 1-5 A wellhead crude oil sealing and recovery device for oilfield well workover includes a support base 1 and two recovery covers 4. An electric cylinder 13 is installed on the inner bottom wall of the support base 1. A lifting plate 2 is installed on the telescopic end of the electric cylinder 13. A connecting column 3 is installed on the bottom surface of the lifting plate 2. A sealing plug plate 8 is connected to the bottom end of the connecting column 3. A wellhead pipe 7 is arranged below the sealing plug plate 8. The outer surface of the sealing plug plate 8 is in close contact with the inner ring of the wellhead pipe 7. A recovery box 11 is installed on one side of the support base 1. A liquid level observation plate 20 is embedded on one side of the recovery box 11. A discharge valve 16 is connected to one side of the recovery box 11. Two recovery hoses 12 are connected to one side of the recovery box 11. One end of each of the two recovery hoses 12 passes through the recovery cover 4 and extends into the interior of the recovery cover 4. The two recovery covers 4 are located outside the wellhead pipe 7. An opening and closing drive mechanism 9 is arranged on one side of the support base 1.

[0017] In this embodiment: the extension and retraction are controlled by the electric cylinder 13 as the power source, which can drive the lifting plate 2 to rise and fall smoothly. The connecting column 3 makes the sealing plug plate 8 fit tightly with the inner ring of the wellhead pipe 7 to form a reliable internal seal, preventing crude oil from leaking from the top of the wellhead pipe 7. The recovery box 11 provides storage space for the leaked crude oil. The liquid level observation plate 20 makes it easy to monitor the recovery volume in real time and avoid overflow. The discharge valve 16 can discharge crude oil for reuse as needed. The recovery hose 12 connects the recovery cover 4 and the recovery box 11 to ensure that the leaked crude oil in the sealed cavity is quickly introduced into the recovery box 11. The whole system realizes the basic sealing and recovery functions.

[0018] Example 2: This example is an improvement on Example 1. The opening and closing drive mechanism 9 includes a drive slide 91 mounted on one side of the support base 1. A dual-axis motor 92 is mounted on the inner wall of the drive slide 91. Transmission screws 93 are fixedly mounted on both output ends of the dual-axis motor 92. Threaded transmission tubes 94 are threadedly connected to the outer surfaces of the two transmission screws 93. One end of each threaded transmission tube 94 is connected to a transmission connecting plate 10. The sides of the two transmission connecting plates 10 that are close to each other are respectively connected to the sides of the two recycling covers 4. Two limiting sliding holes 96 are opened on one side of the drive slide 91. Limiting sliders 95 are slidably connected to the inner walls of the two limiting sliding holes 96. One side of the two limiting sliders 95 is respectively connected to the sides of the two recycling covers 4, and the other side of the two limiting sliders 95 is respectively connected to the sides of the two threaded transmission tubes 94.

[0019] In this embodiment: the drive slide 91 of the opening and closing drive mechanism 9 provides mounting support for the internal components. The operation of the dual-axis motor 92 can simultaneously drive the two transmission screws 93 to rotate, so that the threaded transmission tube 94 moves synchronously in opposite directions along the screw axis. Through the transmission connecting plate 10, it drives the two recycling covers 4 to open and close. The limiting slider 95 slides in the limiting sliding hole 96 to restrict the rotation of the threaded transmission tube 94, ensuring that it only makes linear motion, so that the recycling cover 4 is accurately aligned when closed, avoiding misalignment that affects the seal.

[0020] Example 3: This example is an improvement on Example 1. The upper surface of the opening and closing drive mechanism 9 is connected to a limiting slide 17. The inner wall of the limiting slide 17 is slidably connected to two limiting slide plates 18. One side of each of the two limiting slide plates 18 is connected to one side of each of the two transmission connecting plates 10. Both sides of the support base 1 are connected to limiting slide covers 14. The interior of each of the two limiting slide covers 14 is slidably connected to a limiting upright plate 15. The top of each of the two limiting upright plates 15 is connected to the bottom surface of the lifting plate 2.

[0021] In this embodiment: the two limiting slide plates 18 inside the limiting slide block 17 are connected to the transmission connecting plate 10, and can slide synchronously with the movement of the recovery cover 4, further limiting the opening and closing trajectory of the recovery cover 4, avoiding lateral deviation, and improving the closure sealing performance. The limiting slide covers 14 on both sides of the support base 1 cooperate with the limiting upright plate 15 to provide guidance for the lifting plate 2 to rise and fall, preventing the lifting plate 2 from tilting and causing the sealing plug plate 8 to deviate from the wellhead pipe 7. This allows the sealing plug plate 8 to seal more accurately and close the recovery cover 4, reducing the risk of leakage caused by component deviation.

[0022] Example 4: This example is an improvement on Example 1. The inner walls of the two recovery covers 4 are respectively inlaid with upper arc-shaped sealing gaskets 5 and lower arc-shaped sealing gaskets 6. The sides of the two upper arc-shaped sealing gaskets 5 that are close to each other are in close contact with the outer surface of the connecting column 3. The sides of the two lower arc-shaped sealing gaskets 6 that are close to each other are in contact with the outer surface of the wellhead pipe 7. The sides of the two recovery covers 4 that are close to each other are inlaid with U-shaped sealing gaskets 19. The sides of the two U-shaped sealing gaskets 19 that are close to each other are in contact.

[0023] In this embodiment: the upper arc-shaped sealing gasket 5 of the inner wall of the recovery cover 4 is attached to the outer surface of the connecting column 3, and the lower arc-shaped sealing gasket 6 is attached to the outer surface of the wellhead pipe 7, filling the gap between the components and enhancing the external sealing effect. The U-shaped sealing gaskets 19 of the two recovery covers 4 are attached to each other to prevent crude oil from leaking from the joint of the recovery covers 4, forming an all-round external sealing barrier. The sealing gasket material is elastic and can adapt to slight vibrations during operation, avoiding sealing failure caused by hard contact and improving the overall sealing performance.

[0024] The working principle of this utility model is as follows: First, the electric cylinder 13 on the inner bottom wall of the support base 1 is activated, and its telescopic end pushes the lifting plate 2 to move downward. The lifting plate 2 drives the sealing plug 8 to press down synchronously through the connecting column 3 until the surface of the sealing plug 8 is in close contact with the inner ring of the wellhead pipe 7, thus completing the initial sealing of the top of the wellhead pipe 7. Then, the opening and closing drive mechanism 9 is activated, which drives the dual-axis motor 92 on the inner wall of the slide 91 to rotate, thereby driving the transmission screws 93 at the two output ends to rotate. This causes the threaded transmission pipe 94 to move axially along the transmission screw 93, and through the transmission connecting plate 10, it drives the two recovery covers 4 to move closer to each other and close. During the closing process, the limiting slider 95 slides in the limiting sliding hole 96 of the drive slide 91, and the limiting slide plate 18 slides in the limiting slide 17, ensuring that the recovery cover 4 closes smoothly.

[0025] After the recovery hood 4 is closed, the upper arc-shaped sealing gasket 5 on its inner wall is in close contact with the outer surface of the connecting column 3, and the lower arc-shaped sealing gasket 6 is in contact with the outer surface of the wellhead pipe 7. At the same time, the U-shaped sealing gaskets 19 on the mating surfaces of the two recovery hoods 4 are in contact with each other, forming an all-round seal on the outside of the wellhead pipe 7 and the outside of the connecting column 3, preventing crude oil leakage gaps. The crude oil leaked during the well workover operation is sealed in the cavity formed by the two recovery hoods 4. Through the recovery hose 12 connecting the recovery hood 4 and the recovery box 11, it flows into the recovery box 11 under the action of pressure difference to complete the recovery. The operator can monitor the recovery amount in real time through the liquid level observation plate 20 on the side of the recovery box 11. When a certain amount is recovered, the discharge valve 16 can be opened to export the recovered crude oil for reuse, avoiding resource waste and environmental pollution.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A wellhead crude oil sealing and recovery device for oilfield well workover, comprising a support base (1) and two recovery covers (4), characterized in that: An electric cylinder (13) is installed on the inner bottom wall of the support base (1). A lifting plate (2) is installed on the telescopic end of the electric cylinder (13). A connecting column (3) is installed on the bottom surface of the lifting plate (2). A sealing plug (8) is connected to the bottom end of the connecting column (3). A wellhead pipe (7) is provided below the sealing plug (8). The outer surface of the sealing plug (8) is in close contact with the inner ring of the wellhead pipe (7). A recovery box (11) is installed on one side of the support base (1). Two recovery hoses (12) are connected to one side of the recovery box (11). One end of each of the two recovery hoses (12) passes through the recovery cover (4) and extends into the interior of the recovery cover (4). The two recovery covers (4) are located outside the wellhead pipe (7). An opening and closing drive mechanism (9) is provided on one side of the support base (1).

2. The wellhead crude oil sealing and recovery device for oilfield well workover as described in claim 1, characterized in that: The opening and closing drive mechanism (9) includes a drive slide (91) mounted on one side of the support base (1). A dual-axis motor (92) is mounted on the inner wall of the drive slide (91). A transmission screw (93) is fixedly mounted on both output ends of the dual-axis motor (92). A threaded transmission tube (94) is threadedly connected to the outer surface of the two transmission screws (93). A transmission connecting plate (10) is connected to one end of the two threaded transmission tubes (94). The sides of the two transmission connecting plates (10) that are close to each other are respectively connected to one side of the two recycling covers (4).

3. The wellhead crude oil sealing and recovery device for oilfield well workover as described in claim 2, characterized in that: Two limiting sliding holes (96) are provided on one side of the drive slide (91). The inner walls of the two limiting sliding holes (96) are slidably connected to limiting sliders (95). One side of the two limiting sliders (95) is connected to one side of the two recycling covers (4), and the other side of the two limiting sliders (95) is connected to one side of the two threaded transmission tubes (94).

4. The wellhead crude oil sealing and recovery device for oilfield well workover as described in claim 2, characterized in that: The upper surface of the opening and closing drive mechanism (9) is connected to a limiting slide (17), and the inner wall of the limiting slide (17) is slidably connected to two limiting slide plates (18). One side of each of the two limiting slide plates (18) is connected to one side of each of the two transmission connecting plates (10).

5. The wellhead crude oil sealing and recovery device for oilfield well workover as described in claim 1, characterized in that: Both sides of the support base (1) are connected to limit sliding covers (14), and the interior of the two limit sliding covers (14) is slidably connected to limit uprights (15). The top of the two limit uprights (15) is connected to the bottom surface of the lifting plate (2).

6. The wellhead crude oil sealing and recovery device for oilfield well workover as described in claim 1, characterized in that: The inner walls of the two recovery covers (4) are respectively inlaid with upper arc-shaped sealing gaskets (5) and lower arc-shaped sealing gaskets (6). The two upper arc-shaped sealing gaskets (5) are in close contact with the outer surface of the connecting column (3) on one side, and the two lower arc-shaped sealing gaskets (6) are in contact with the outer surface of the wellhead pipe (7) on one side.

7. The wellhead crude oil sealing and recovery device for oilfield well workover as described in claim 1, characterized in that: The two recycling covers (4) are each inlaid with a U-shaped sealing gasket (19) on one side that is close to each other, and the two U-shaped sealing gaskets (19) are in contact on one side that is close to each other.

8. The wellhead crude oil sealing and recovery device for oilfield well workover as described in claim 1, characterized in that: A liquid level observation plate (20) is embedded on one side of the recovery tank (11), and a discharge valve (16) is connected to one side of the recovery tank (11).

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