Oil well under-pressure operation casing ground shutoff device

Abstract

The utility model discloses an oil well under-pressure operation casing ground shutoff device which comprises a sealing sleeve, an upper casing is installed at the upper end of the sealing sleeve, a lower casing is installed at the bottom end of the sealing sleeve, and two sets of screws are symmetrically installed on the two side walls of the sealing sleeve. The locking device has the beneficial effects that a group of locking mechanism consisting of the connecting cavity, the connecting block, the telescopic rod, the spring, the wedge-shaped block and the limiting hole is arranged, so that the connecting block can be inserted into the connecting cavity in the process of sealing and locking the upper sleeve and the lower sleeve through the sealing clamping ring; in the connecting process, the telescopic rod and the spring are extruded through the wedge-shaped block, and after the telescopic rod and the spring are inserted in place, the wedge-shaped block is reset and inserted into the limiting hole under the action of resilience force of the telescopic rod and the spring, so that the two groups of sealing clamping rings are connected into a whole, and the phenomenon that the sealing clamping rings are loosened due to vibration can be effectively prevented; the sealing and locking effects on the upper sleeve and the lower sleeve are ensured, and the use performance is high.

Description

Technical Field

[0001] This utility model relates to the technical field of oil well production equipment, specifically to a surface shut-off device for oil well pressurized casing. Background Technology

[0002] Petroleum is a fluid mineral buried deep underground. Initially, people called naturally occurring oily liquid minerals petroleum, combustible gases natural gas, and solid combustible fuel minerals bitumen. As research into these minerals deepened, it was recognized that they are all hydrocarbon compounds in composition and interconnected in their formation, so they are collectively referred to as petroleum.

[0003] Patent publication number CN213838572U discloses a surface shut-off device for casing during pressurized oil well operations, comprising a lower casing, an upper connecting pipe, and an outer shell. The outer shell includes an upper end, a middle part, and a lower end, which are fixedly connected from top to bottom. An installation hole is provided inside the outer shell, which penetrates the upper end, the middle part, and the lower end. The lower casing and the upper connecting pipe are located inside the installation hole.

[0004] While the aforementioned patent can make the connection between pipelines more reliable during use, and the sealing element can seal the pipeline connection from the inside out, thereby increasing the sealing effect of the device, in actual use, because the pipelines are locked and fixed by the screw driving the clamp, the lack of a limiting mechanism makes them prone to loosening due to external vibrations during use, affecting the locking and sealing effect, resulting in low stability and poor performance. Therefore, there is an urgent need for a surface shut-off device for oil well pressurized casing to solve the above problems. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] The technical problem to be solved by this utility model is to provide a surface shut-off device for oil well pressurized casing, which is in response to the current state of the technology.

[0007] (II) Technical Solution

[0008] This utility model is achieved through the following technical solution: This utility model proposes a surface shut-off device for casing during pressurized oil well operations, including a sealing sleeve. An upper casing is installed at the upper end of the sealing sleeve, and a lower casing is installed at the bottom end of the sealing sleeve. Two sets of screws are symmetrically installed on the two side walls of the sealing sleeve. A sealing ring is provided at one end of each screw. A connecting cavity is opened on the side wall of one set of sealing rings. A telescopic rod is provided on one side of the connecting cavity. A spring is sleeved on the outside of the telescopic rod. A wedge block is fixed on the movable part of the telescopic rod. A connecting block is reserved on the side wall of the other set of sealing rings. A limit hole is opened on one side wall of the connecting block.

[0009] Furthermore, the upper sleeve is inserted into the lower sleeve, and a sealing ring is provided at the connection between the upper sleeve and the lower sleeve.

[0010] Furthermore, the screw and the sealing sleeve are connected by threads, and a knob is provided at one end of the screw.

[0011] Furthermore, the sealing ring is rotatably connected to the other end of the screw, and the inner diameter of the sealing ring matches the outer diameter of the upper sleeve and the lower sleeve.

[0012] Furthermore, the connecting cavity is formed on one set of the sealing rings, the connecting block is formed on another set of the sealing rings, and the connecting block is inserted into the connecting cavity.

[0013] Furthermore, the spring is welded to the outer wall of the telescopic rod, and the wedge block is fixed to the movable part of the telescopic rod by screws.

[0014] Furthermore, the limiting hole is formed on the connecting block, and the wedge block is inserted into the limiting hole.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, this utility model has the following advantages:

[0017] This utility model employs a locking mechanism consisting of a connecting cavity, a connecting block, a telescopic rod, a spring, a wedge block, and a limiting hole. During the sealing and locking process of the upper and lower sleeves using sealing rings, the connecting block can be inserted into the connecting cavity. During connection, the wedge block compresses the telescopic rod and spring. Once inserted into place, the wedge block returns to its original position under the rebound force of the telescopic rod and spring, thus connecting the two sets of sealing rings into one unit. This effectively prevents the sealing rings from loosening due to vibration, ensuring a secure sealing and locking effect on the upper and lower sleeves, resulting in high performance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a surface shut-off device for oil well pressurized casing as described in this utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of the sealing sleeve in the surface shut-off device for oil well pressurized operation casing described in this utility model;

[0020] Figure 3 This is a top sectional view of the sealing ring connection relationship in the oil well pressurized casing surface shut-off device described in this utility model;

[0021] Figure 4 This utility model describes a surface shut-off device for casing during live oil well operations. Figure 3 Enlarged view of point A in the middle.

[0022] The annotations in the attached figures are explained as follows:

[0023] 1. Sealing sleeve; 2. Upper sleeve; 3. Lower sleeve; 4. Screw; 5. Knob; 6. Sealing ring; 7. Connecting block; 8. Connecting cavity; 9. Wedge block; 10. Limiting hole; 11. Telescopic rod; 12. Spring. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] like Figures 1-4 As shown in this embodiment, a well pressurized casing surface shut-off device includes a sealing sleeve 1, an upper casing 2 installed at the upper end of the sealing sleeve 1, and a lower casing 3 installed at the bottom end of the sealing sleeve 1. Two sets of screws 4 are symmetrically installed on the two side walls of the sealing sleeve 1. A sealing ring 6 is provided at one end of the screw 4, which can lock and fix the upper casing 2 and the lower casing 3. A connecting cavity 8 is opened on the side wall of one set of sealing rings 6. A telescopic rod 11 is provided on one side of the connecting cavity 8. A spring 12 is sleeved on the outside of the telescopic rod 11. A wedge block 9 is fixed on the movable part of the telescopic rod 11. A connecting block 7 is reserved on the side wall of the other set of sealing rings 6. A limit hole 10 is opened on one side wall of the connecting block 7, which can realize the locking connection of the two sets of sealing rings 6, and thus connect them into one body to prevent vibration from affecting their sealing and locking effect.

[0026] like Figures 1-4 In this embodiment, the upper sleeve 2 and the lower sleeve 3 are inserted together. A sealing ring is provided at the connection between the upper sleeve 2 and the lower sleeve 3. The screw 4 and the sealing sleeve 1 are connected by threads. A knob 5 is reserved at one end of the screw 4. The sealing ring 6 is rotatably connected to the other end of the screw 4. The inner diameter of the sealing ring 6 matches the outer diameter of the upper sleeve 2 and the lower sleeve 3. In use, the upper sleeve 2 and the lower sleeve 3 are first connected in the sealing sleeve 1. Then, the screw 4 is rotated by the knob 5, which causes the sealing ring 6 to move and seal and lock the upper sleeve 2 and the lower sleeve 3.

[0027] like Figures 1-4In this embodiment, the connecting cavity 8 is formed on a set of sealing rings 6, and the connecting block 7 is formed on another set of sealing rings 6. The connecting block 7 is inserted into the connecting cavity 8. The spring 12 is welded to the outer wall of the telescopic rod 11. The wedge block 9 is fixed to the movable part of the telescopic rod 11 by screws. The limiting hole 10 is formed on the connecting block 7. The wedge block 9 is inserted into the limiting hole 10. During the process of sealing and locking the upper sleeve 2 and the lower sleeve 3 through the sealing rings 6, the connecting block 7 can be inserted into the connecting cavity 8. During the connection process, the telescopic rod 11 and the spring 12 are squeezed by the wedge block 9. When it is inserted into place, the wedge block 9 is reset and inserted into the limiting hole 10 under the action of the elastic force of the telescopic rod 11 and the spring 12, thereby connecting the two sets of sealing rings 6 into one. This can effectively prevent the sealing rings 6 from loosening due to vibration, and ensure its sealing and locking effect on the upper sleeve 2 and the lower sleeve 3, resulting in high performance.

[0028] The specific implementation process of this embodiment is as follows: First, the upper sleeve 2 and the lower sleeve 3 are connected in the sealing sleeve 1. Then, the screw 4 is rotated by the knob 5, which causes the sealing ring 6 to move and seal and lock the upper sleeve 2 and the lower sleeve 3. During the process of sealing and locking the upper sleeve 2 and the lower sleeve 3 by the sealing ring 6, the connecting block 7 can be inserted into the connecting cavity 8. During the connection process, the wedge block 9 squeezes the telescopic rod 11 and the spring 12. When it is inserted into place, the wedge block 9 is reset and inserted into the limiting hole 10 under the action of the elastic force of the telescopic rod 11 and the spring 12, thereby connecting the two sets of sealing rings 6 into one, which can effectively prevent the sealing ring 6 from loosening due to vibration, and ensure its sealing and locking effect on the upper sleeve 2 and the lower sleeve 3, resulting in high performance.

[0029] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily 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 is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A surface shut-off device for casing during live oil well operations, characterized in that: The device includes a sealing sleeve (1), an upper sleeve (2) installed at the upper end of the sealing sleeve (1), a lower sleeve (3) installed at the bottom end of the sealing sleeve (1), two sets of screws (4) symmetrically installed on the two side walls of the sealing sleeve (1), a sealing ring (6) provided at one end of the screw (4), a connecting cavity (8) opened on the side wall of one set of the sealing ring (6), a telescopic rod (11) provided on one side of the connecting cavity (8), a spring (12) sleeved on the outside of the telescopic rod (11), a wedge block (9) fixed on the movable part of the telescopic rod (11), a connecting block (7) reserved on the side wall of the other set of the sealing ring (6), and a limit hole (10) opened on one side wall of the connecting block (7).

2. The surface shut-off device for casing during live well operations according to claim 1, characterized in that: The upper sleeve (2) is inserted into the lower sleeve (3), and a sealing ring is provided at the connection between the upper sleeve (2) and the lower sleeve (3).

3. The surface shut-off device for casing during live well operations according to claim 1, characterized in that: The screw (4) is connected to the sealing sleeve (1) by a thread, and a knob (5) is reserved at one end of the screw (4).

4. The surface shut-off device for casing during live well operations according to claim 1, characterized in that: The sealing ring (6) is rotatably connected to the other end of the screw (4), and the inner diameter of the sealing ring (6) matches the outer diameter of the upper sleeve (2) and the lower sleeve (3).

5. The surface shut-off device for casing during live well operations according to claim 4, characterized in that: The connecting cavity (8) is formed on a set of sealing rings (6), and the connecting block (7) is formed on another set of sealing rings (6). The connecting block (7) is inserted into the connecting cavity (8).

6. The surface shut-off device for casing during live oil well operations according to claim 5, characterized in that: The spring (12) is welded to the outer wall of the telescopic rod (11), and the wedge block (9) is fixed to the movable part of the telescopic rod (11) by screws.

7. The surface shut-off device for casing during live well operations according to claim 6, characterized in that: The limiting hole (10) is formed on the connecting block (7), and the wedge block (9) is inserted into the limiting hole (10).

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