Compact fracturing wellhead device

Abstract

The invention belongs to the technical field of producing well mouths, and particularly relates to a compact fracturing well mouth device which comprises a four-way body, the upper end of the four-way body is fixedly connected with a first flange, the lower end of the four-way body is fixedly connected with a second flange, and the lower end of the first flange is fixedly connected with the upper end of a first step sealing block. The first stepped sealing block is arranged in the four-way body, an upper port of the first flange is fixedly connected with the first ball valve, and an annular protruding block is arranged on the outer wall of the oil pipe double-male nipple and is in clearance fit with a vertical channel of the four-way body. Through the arrangement of the first sealing gasket ring and the second sealing gasket ring and the structure that the first step sealing block is embedded into the first step sealing cavity and the second step sealing block is embedded into the second step sealing cavity, the sealing performance between the four-way body and the first flange and between the four-way body and the second flange is enhanced from multiple levels, and fracturing fluid leakage is effectively prevented; and the safety and the reliability of fracturing operation are guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of oil wellhead technology, specifically referring to a compact fracturing wellhead device. Background Technology

[0002] In oil and gas field development, fracturing is one of the important means to improve oil and gas well production and recovery rate. As a key piece of equipment in fracturing operations, the performance of the fracturing wellhead unit directly affects the effectiveness and safety of the fracturing operation.

[0003] Traditional fracturing wellhead devices often have some shortcomings. In terms of sealing, some devices have relatively simple sealing structures, relying solely on a single gasket or sealing ring for sealing. Under high pressure and complex downhole environments, this can easily lead to seal failure, resulting in fracturing fluid leakage. This not only wastes resources but may also cause safety accidents.

[0004] Regarding coaxiality during installation, some wellhead equipment may not be able to guarantee coaxiality between the tubing, four-way body, and casing during installation. This can lead to unstable connections between components, uneven stress on the gaskets, further affecting the sealing effect and shortening the service life of the equipment.

[0005] Furthermore, traditional fracturing wellhead devices are not sufficiently robust in preventing backflow. When fracturing fluid supply ceases, backflow can easily occur, damaging the equipment and the downhole environment. They also present inconveniences in operation and observation, as the annulus sealing cannot be monitored effectively in real time, increasing the difficulty and risk of the operation. Summary of the Invention

[0006] To address the aforementioned problems, this invention proposes a compact fracturing wellhead device.

[0007] The technical solution adopted by this invention is as follows: This invention provides a compact fracturing wellhead device, including a four-way body. The upper end of the four-way body is fixedly connected to a first flange, and the lower end of the four-way body is fixedly connected to a second flange. The lower end of the first flange is fixedly connected to the upper end of a first stepped sealing block, which is disposed within the four-way body. The upper port of the first flange is fixedly connected to a first ball valve. An annular protrusion is provided on the outer wall of the double male tubing section, and the annular protrusion is clearance-fitted with the vertical channel of the four-way body. A second ball valve is connected through the side wall of the four-way body, and a third ball valve is connected through the other side wall of the four-way body. A flow pressurization component is provided at the upper internal end of the double male tubing section, and an anti-backflow component is provided at the lower internal end of the double male tubing section.

[0008] Furthermore, lifting bolts are fixedly connected to the outer wall of the four-way body.

[0009] Furthermore, a first sealing gasket is provided between the first flange and the four-way body, and a second sealing gasket is provided between the four-way body and the second flange.

[0010] Furthermore, a first stepped sealing cavity is provided at the upper end of the four-way body, and a first stepped sealing block is provided at the lower end of the first flange. The first stepped sealing block is used to be embedded in the first stepped sealing cavity.

[0011] Furthermore, a second stepped sealing cavity is provided at the lower end of the four-way body, and a second stepped sealing block is provided at the upper end of the second flange. The second stepped sealing block is used to be embedded in the second stepped sealing cavity.

[0012] Furthermore, the four-way body and the first flange are fixedly connected by the first fixing bolt, and the four-way body and the second flange are fixedly connected by the second fixing bolt.

[0013] Furthermore, the anti-backflow assembly includes a first ring, which is fixedly connected to the lower end of the inner wall of the double male short section of the oil pipe. A first cross is fixedly connected inside the first ring. The top of the first cross is connected to a first fixing block. A first sliding rod is slidably sleeved inside the first fixing block. A first limiting block is fixedly connected to the upper end of the first sliding rod. A sealing ball is fixedly connected to the lower end of the first sliding rod. The sealing ball is used to block the lower end of the double male short section of the oil pipe. One end of a first spring is fixedly connected to the top of the sealing ball. The other end of the first spring is fixedly connected to the lower end of the first cross. The first spring is sleeved on the first sliding rod.

[0014] Furthermore, the flow pressurization assembly includes a cavity, the cavity having an opening inside a first flange, a sliding groove being formed on one side of the first flange, a second ring being fixedly connected to the inner wall of the double male short section of the oil pipe, a second cross being fixedly connected inside the second ring, a second fixing block being fixedly connected to the lower end of the second cross, a second sliding rod being slidably sleeved on the second fixing block, a second spring being fixedly connected to the upper end of the second sliding rod, a second limiting block being fixedly connected to the lower end of the second sliding rod, one end of the second spring being fixedly connected to the lower end of the baffle, the other end of the second spring being fixedly connected to the second cross, the second spring being sleeved on the second sliding rod, one end of a downward pressure rod being fixedly connected to the side wall of the baffle, and the other end of the downward pressure rod being disposed in the sliding groove.

[0015] The beneficial effects achieved by the present invention using the above structure are as follows: (1) By setting a first sealing gasket ring and a second sealing gasket ring, and a structure in which the first stepped sealing block is embedded in the first stepped sealing cavity and the second stepped sealing block is embedded in the second stepped sealing cavity, the sealing performance between the four-way body and the first flange and the second flange is enhanced from multiple levels, effectively preventing the leakage of fracturing fluid and ensuring the safety and reliability of fracturing operations.

[0016] (2) The annular protrusion on the outer wall of the double male short section of the oil pipe is fitted with the vertical channel of the four-way body with clearance. During the installation process, this design can ensure the coaxiality of the oil pipe, the four-way body and the sleeve, thereby ensuring that the first flange, the four-way body and the two ends of the second flange are reliably coaxial with the sealing gasket ring, which is conducive to the stable connection of each component and the long-term maintenance of the sealing effect.

[0017] (3) Under the action of the first spring, the sealing ball in the anti-backflow assembly can quickly reset when the fracturing fluid stops supplying oil, block the lower end of the double male short section of the tubing, effectively prevent the fracturing fluid from flowing back, avoid adverse effects on the equipment and downhole environment, and ensure the smooth progress of fracturing operations and the normal development of subsequent processes.

[0018] (4) The flow pressurization component is ingeniously designed. When the fracturing fluid enters the cavity and impacts the baffle, the second spring is compressed, and the baffle moves downward, causing the lower pressure rod to abut against the bottom of the sliding groove, which further strengthens the sealing between the first flange and the four-way body. This dynamic sealing enhancement mechanism can automatically adjust according to the flow and pressure changes of the fracturing fluid, improving the adaptability and effectiveness of the seal.

[0019] (5) During use, opening the second and third ball valves allows for convenient injection of fracturing fluid, and the sealing reliability of the annulus can be observed through these two ball valves, making it easier to detect and handle problems in a timely manner. After fracturing is completed, simply closing the three ball valves allows for the entry of the fracturing well shut-in process, which is simple and intuitive to operate and improves work efficiency. Attached Figure Description

[0020] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a compact fracturing wellhead device according to the present invention; Figure 2 This is a top view of the first cross; Figure 3 This is a bottom view of the second cross; Figure 4 for Figure 1 Enlarged view of part A in the middle; Figure 5 for Figure 1 Enlarged view of part B in the middle section.

[0022] The components are as follows: 1. Four-way body; 2. Oil pipe double male short section; 3. Annular protrusion; 4. First fixing bolt; 5. First ball valve; 6. Second ball valve; 7. Third ball valve; 8. First flange; 9. Second flange; 10. First sealing gasket ring; 11. Second sealing gasket ring; 12. First circular ring; 13. First cross; 14. First fixing block; 15. First spring; 16. Sealing ball; 17. First sliding rod; 18. First limiting block; 19. First stepped sealing cavity; 20. First stepped sealing block; 21. Second stepped sealing cavity; 22. Second stepped sealing block; 23. Second circular ring; 24. Second cross; 25. Second fixing block; 26. Second spring; 27. Baffle; 28. Second sliding rod; 29. ​​Second limiting block; 30. Sliding groove; 31. Downward pressure rod; 32. Lifting bolt; 33. Second fixing bolt. Detailed Implementation

[0023] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0024] like Figures 1-5 As shown, this invention proposes a compact fracturing wellhead device, including a four-way body 1. The upper end of the four-way body 1 is fixedly connected to a first flange 8, and the lower end of the four-way body 1 is fixedly connected to a second flange 9. The lower end of the first flange 8 is fixedly connected to the upper end of a first stepped sealing block 20, which is disposed inside the four-way body 1. The upper port of the first flange 8 is fixedly connected to a first ball valve 5. An annular protrusion 3 is provided on the outer wall of the tubing double male short section 2, and the annular protrusion 3 is clearance-fitted with the vertical channel of the four-way body 1. A second ball valve 6 is connected through the side wall of the four-way body 1, and a third ball valve 7 is connected through the other side wall of the four-way body 1. A flow pressurization component is provided at the upper internal end of the tubing double male short section 2, and an anti-backflow component is provided at the lower internal end of the tubing double male short section 2.

[0025] Lifting bolts 32 are fixedly connected to the outer wall of the four-way body 1.

[0026] A first sealing gasket 10 is provided between the first flange 8 and the four-way body 1, and a second sealing gasket 11 is provided between the four-way body 1 and the second flange 9.

[0027] The upper end of the four-way body 1 is provided with a first stepped sealing cavity 19, and the lower end of the first flange 8 is provided with a first stepped sealing block 20. The first stepped sealing block 20 is used to be embedded in the first stepped sealing cavity 19.

[0028] The lower end of the four-way body 1 is provided with a second stepped sealing cavity 21, and the upper end of the second flange 9 is provided with a second stepped sealing block 22. The second stepped sealing block 22 is used to be embedded in the second stepped sealing cavity 21.

[0029] The four-way body 1 and the first flange 8 are fixedly connected by the first fixing bolt 4, and the four-way body 1 and the second flange 9 are fixedly connected by the second fixing bolt 33.

[0030] The anti-backflow assembly includes a first ring 12, which is fixedly connected to the lower end of the inner wall of the double male oil pipe section 2. A first cross 13 is fixedly connected inside the first ring 12. The top of the first cross 13 is connected to a first fixing block 14. A first slide rod 17 is slidably sleeved inside the first fixing block 14. The upper end of the first slide rod 17 is fixedly connected to a first limiting block 18. The lower end of the first slide rod 17 is fixedly connected to a sealing ball 16. The sealing ball 16 is used to block the lower end of the double male oil pipe section 2. The top of the sealing ball 16 is fixedly connected to one end of a first spring 15. The other end of the first spring 15 is fixedly connected to the lower end of the first cross 13. The first spring 15 is sleeved on the first slide rod 17.

[0031] The flow pressurization assembly includes a cavity with a first flange 8 inside. A sliding groove 30 is formed on one side of the first flange 8. A second ring 23 is fixedly connected to the inner wall of the double male short section 2 of the oil pipe. A second cross 24 is fixedly connected inside the second ring 23. A second fixing block 25 is fixedly connected to the lower end of the second cross 24. A second slide rod 28 is slidably sleeved on the second fixing block 25. A second spring 26 is fixedly connected to the upper end of the second slide rod 28. A second limiting block 29 is fixedly connected to the lower end of the second slide rod 28. One end of the second spring 26 is fixedly connected to the lower end of the baffle 27. The other end of the second spring 26 is fixedly connected to the second cross 24. The second spring 26 is sleeved on the second slide rod 28. One end of a downward pressure rod 31 is fixedly connected to the side wall of the baffle 27. The other end of the downward pressure rod 31 is located in the sliding groove 30.

[0032] In practical use, when fracturing fluid needs to be injected, open the second ball valve 6 and the third ball valve 7, connect the fracturing fluid injection device to the first ball valve 5, and the annulus packer connected in series with the tubing can reliably seal the annulus between the tubing and the casing under pressure. The sealing reliability of the annulus can be observed through the second ball valve 6 and the third ball valve 7. When fracturing is completed and no longer needed, proceed to the fracturing shut-off process by closing the first ball valve 5, the second ball valve 6, and the third ball valve 7. The first flange 8 is fixedly connected to the four-way body 1 by the first fixing bolt 4, and the second flange 9 is fixedly connected to the four-way body 1. Body 1 is fixedly connected by the second fixing bolt 33; the outer wall of the double male oil pipe section 2 is provided with an annular protrusion 3 extending in the circumferential direction. The annular protrusion 3 is clearance-fitted with the vertical channel of the four-way body 1. During installation, after the double male oil pipe section 2 is threadedly connected to the first flange 8, the oil pipe is threadedly connected to the double male oil pipe section 2. At this time, the first flange 8 and the double male oil pipe section 2 are located above the four-way body 1. Then the four-way body 1 is hoisted. During the hoisting of the four-way body 1, the double male oil pipe section 2 is lowered into the vertical channel of the four-way body 1. At this time, the annular protrusion 3 is clearance-fitted with the vertical channel of the four-way body 1. The shaped protrusion 3 is clearance-fitted with the vertical channel to ensure the coaxiality of the tubing, the four-way body 1, and the casing, further ensuring the reliable coaxiality of the first flange 8, the four-way body 1, the second flange 9, and the first sealing gasket 10 and the second sealing gasket 11. The first stepped sealing block 20 is used to embed into the first stepped sealing cavity 19 to increase the sealing between the four-way body 1 and the first flange 8. The second stepped sealing block 22 is used to embed into the second stepped sealing cavity 21 to increase the sealing between the four-way body 1 and the second flange 9. When the fracturing fluid enters the cavity, it impacts the baffle. 27. At this time, the second spring 26 is compressed, and the baffle 27 moves downward, causing the lower pressure rod 31 to move downward, thereby abutting the bottom end of the sliding groove 30, thus strengthening the sealing between the first flange 8 and the four-way body 1. The fracturing fluid enters the double male short section 2 of the tubing, pushes open the sealing ball 16, and enters the tubing. At this time, the first spring 15 is compressed. When the fracturing fluid supply stops, the first spring 15 drives the sealing ball 16 to reset, blocking the lower end of the double male short section 2 of the tubing to prevent the fracturing fluid from flowing back. The above is the overall working process of the present invention. This step can be repeated for the next use.

[0033] As can be seen from the above embodiments, the beneficial effects of the present invention are as follows: By setting a first and second sealing gasket ring, and a structure in which the first stepped sealing block is embedded in the first stepped sealing cavity and the second stepped sealing block is embedded in the second stepped sealing cavity, the sealing performance between the four-way body and the first and second flanges is enhanced from multiple levels, effectively preventing fracturing fluid leakage and ensuring the safety and reliability of fracturing operations. The annular protrusion on the outer wall of the tubing double male short section is clearance-fitted with the vertical channel of the four-way body. During installation, this design ensures the coaxiality of the tubing, the four-way body, and the casing, thereby ensuring reliable coaxiality between the first flange, the four-way body, the two ends of the second flange, and the sealing gasket rings. This is beneficial for the stable connection of each component and the long-term maintenance of the sealing effect. The sealing ball in the anti-backflow assembly, under the action of the first spring, can quickly reset when the fracturing fluid supply stops, blocking the lower end of the tubing double male short section, effectively preventing leakage. To prevent backflow of fracturing fluid and avoid adverse effects on equipment and the downhole environment, the design ensures the smooth progress of fracturing operations and the normal operation of subsequent processes. The ingenious design of the flow-pressurization component allows the second spring to be compressed when fracturing fluid enters the cavity and impacts the baffle. This causes the baffle to move downwards, pushing the lower pressure rod against the bottom of the sliding groove, further strengthening the seal between the first flange and the four-way body. This dynamic sealing enhancement mechanism automatically adjusts according to changes in fracturing fluid flow and pressure, improving the adaptability and effectiveness of the seal. During operation, opening the second and third ball valves allows for convenient injection of fracturing fluid, and the sealing reliability of the annulus can be observed through these two ball valves, facilitating timely detection and handling of problems. After fracturing is completed, simply closing the three ball valves allows for the start of the fracturing well shut-in process, making operation simple and intuitive, and improving operational efficiency.

[0034] The above description of the disclosed embodiments enables those skilled in the art to make or use the 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 invention. Therefore, the 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 compact fracturing wellhead device, comprising a four-way body (1), wherein the upper end of the four-way body (1) is fixedly connected to a first flange (8), the lower end of the four-way body (1) is fixedly connected to a second flange (9), the lower end of the first flange (8) is fixedly connected to the upper end of a first stepped sealing block (20), the first stepped sealing block (20) is disposed inside the four-way body (1), the upper port of the first flange (8) is fixedly connected to a first ball valve (5), an annular protrusion (3) is provided on the outer wall of the tubing double male short section (2), the annular protrusion (3) is clearance-fitted with the vertical channel of the four-way body (1), a second ball valve (6) is connected through the side wall of the four-way body (1), and a third ball valve (7) is connected through the other side wall of the four-way body (1), characterized in that: The upper part of the double male short section (2) of the oil pipe is provided with a flow pressurization component, and the lower part of the double male short section (2) of the oil pipe is provided with an anti-backflow component.

2. The compact fracturing wellhead device according to claim 1, characterized in that: Lifting bolts (32) are fixedly connected to the outer wall of the four-way body (1).

3. A compact fracturing wellhead device according to claim 2, characterized in that: A first sealing gasket (10) is provided between the first flange (8) and the four-way body (1), and a second sealing gasket (11) is provided between the four-way body (1) and the second flange (9).

4. A compact fracturing wellhead device according to claim 3, characterized in that: The upper end of the four-way body (1) is provided with a first stepped sealing cavity (19), and the lower end of the first flange (8) is provided with a first stepped sealing block (20). The first stepped sealing block (20) is used to be embedded in the first stepped sealing cavity (19).

5. A compact fracturing wellhead device according to claim 4, characterized in that: The lower end of the four-way body (1) is provided with a second stepped sealing cavity (21), and the upper end of the second flange (9) is provided with a second stepped sealing block (22), which is used to be embedded in the second stepped sealing cavity (21).

6. A compact fracturing wellhead device according to claim 5, characterized in that: The four-way body (1) and the first flange (8) are fixedly connected by the first fixing bolt (4), and the four-way body (1) and the second flange (9) are fixedly connected by the second fixing bolt (33).

7. A compact fracturing wellhead device according to claim 6, characterized in that: The anti-backflow assembly includes a first ring (12), which is fixedly connected to the lower end of the inner wall of the double male short section (2) of the oil pipe. A first cross (13) is fixedly connected inside the first ring (12). The top of the first cross (13) is connected to a first fixing block (14). A first slide rod (17) is slidably sleeved inside the first fixing block (14). The upper end of the first slide rod (17) is fixedly connected to a first limiting block (18). The lower end of the first slide rod (17) is fixedly connected to a sealing ball (16). The sealing ball (16) is used to block the lower end of the double male short section (2) of the oil pipe. The top of the sealing ball (16) is fixedly connected to one end of a first spring (15). The other end of the first spring (15) is fixedly connected to the lower end of the first cross (13). The first spring (15) is sleeved on the first slide rod (17).

8. A compact fracturing wellhead device according to claim 7, characterized in that: The flow pressurization assembly includes a cavity, inside which a first flange (8) is opened. A sliding groove (30) is opened on one side of the first flange (8). A second ring (23) is fixedly connected to the inner wall of the double male short section (2) of the oil pipe. A second cross (24) is fixedly connected inside the second ring (23). A second fixing block (25) is fixedly connected to the lower end of the second cross (24). A second sliding rod (28) is slidably sleeved on the second fixing block (25). The upper part of the second sliding rod (28) is... The second spring (26) is fixedly connected to the end of the second slide rod (28), the second limiting block (29) is fixedly connected to the lower end of the baffle (27), one end of the second spring (26) is fixedly connected to the lower end of the baffle (27), the other end of the second spring (26) is fixedly connected to the second cross (24), the second spring (26) is sleeved on the second slide rod (28), one end of the pressing rod (31) is fixedly connected to the side wall of the baffle (27), and the other end of the pressing rod (31) is located in the sliding groove (30).

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