Efficient temporary blocking anti-overflow device

Abstract

The utility model relates to the technical field of oil extraction, in particular to an efficient temporary plugging anti-overflow device. Comprising an upper connector, the upper connector is fixedly and hermetically connected with a valve connector, the lower end of the valve connector is fixedly and hermetically connected with a filter pipe and an outer cylinder, the filter pipe is located on the inner side of the outer cylinder, the valve connector is provided with an air hole communicated with an annular cavity between the outer cylinder and the filter pipe, and a check valve is installed in the air hole; the lower end of the filter pipe is fixedly and hermetically connected with a lower pipe located inside the outer cylinder, the lower end of the lower pipe is blocked and fixedly connected with the lower end of the outer cylinder through a lower connector, and a temporary blocking plate is detachably, fixedly and hermetically connected into the lower connector. Through soluble temporary plugging, multi-stage filtering, gas-liquid separation and modular sealing design, the device has the core advantages of efficient overflow prevention, rapid production, airlock prevention, low maintenance cost and the like, has both environmental protection property and economical efficiency, and is suitable for oil well operation under complex working conditions.

Description

Technical Field

[0001] This utility model relates to the field of oil extraction technology, specifically to a high-efficiency temporary plugging and overflow prevention device. Background Technology

[0002] During oilfield development, when performing well workover, completion, or production enhancement operations on wells at risk of overflow, temporary plugging of the wellbore is necessary to prevent blowouts or overflows. Traditional temporary plugging techniques often employ mechanical packers or chemical gel plugging. However, mechanical packers present challenges such as difficulty in unsealing and the risk of stuck drill bits, while chemical plugging materials suffer from uncontrollable dissolution rates and residue clogging of the formation. Furthermore, existing overflow prevention devices often lack gas-liquid separation capabilities, allowing gas to accumulate in the pump chamber during production, forming a gas lock and significantly reducing pump efficiency. Some devices use a single filter structure, which is insufficient to effectively intercept solid particles of different sizes, causing frequent blockages in the tubing and pump valves. Moreover, maintenance requires the entire tubing string to be removed, resulting in high operating costs. To address these issues, there is an urgent need for an overflow prevention device that can reliably temporarily plug, quickly start production, efficiently separate gas and liquid, and is easy to maintain. Utility Model Content

[0003] The main purpose of this utility model is to provide a highly efficient temporary plugging and overflow prevention device that can temporarily plug the wellbore during operation and reduce the airlock phenomenon of the oil pump during production operations.

[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0005] The high-efficiency temporary plugging and overflow prevention device includes an upper connector, which is fixedly and sealed to a valve connector. The lower end of the valve connector is fixedly and sealed to a filter pipe and an outer cylinder. The filter pipe is located inside the outer cylinder. The valve connector has an air hole that communicates with the annular cavity between the outer cylinder and the filter pipe. A one-way valve is installed in the air hole. The filter pipe has multiple inlet holes. The lower end of the filter pipe is fixedly and sealed to a lower pipe, which is located inside the outer cylinder. A spiral blade is fixed to the outside of the lower pipe. The lower end of the lower pipe is sealed. The lower end of the lower pipe is fixedly connected to the lower end of the outer cylinder through a lower connector. A temporary plugging plate is detachably and fixedly sealed inside the lower connector. The temporary plugging plate is made of a soluble material and has a concentric groove at its lower end. A wire-wound screen is fixedly fitted onto the filter pipe. Multiple inlet holes are located inside the wire-wound screen. During oil production, the well fluid first passes through the wire-wound screen and then enters the filter pipe through the inlet holes and flows upward.

[0006] Specifically, the lower end of the filter tube and the upper end of the lower tube are fixedly and sealed together by a coupling.

[0007] Specifically, the temporary plug plate and the inner edge of the lower connector are sealed together by a sealing ring. A boss is machined inside the lower connector above the temporary plug plate. The upper end of the temporary plug plate is tightly against the boss. A pressure ring is threadedly sealed to the lower connector below the temporary plug plate. The upper end of the pressure ring is tightly against the lower end of the temporary plug plate.

[0008] Specifically, the filter tube is fixedly and sealed to the outside with two fixed sleeves, and multiple inlet holes are located between the two fixed sleeves. The wire-wound screen tube is located between the two fixed sleeves, and the upper and lower ends of the wire-wound screen tube are fixedly and sealed to the fixed sleeves on the upper and lower sides respectively.

[0009] Specifically, the outer side of the spiral blade contacts the inner wall of the outer cylinder.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] 1. This device uses a soluble plugging plate for temporary sealing, which automatically releases the plug after dissolution, requiring no manual intervention. The groove design at the lower end of the plugging plate ensures that the thin-walled portion above the groove preferentially forms flow holes during dissolution, quickly establishing an initial flow channel and significantly shortening the preparation time for production. After production begins, the flow of well fluid continuously scours the plugging plate, further accelerating the dissolution process and ensuring the device quickly enters full-power production.

[0012] 3. The well fluid must first undergo primary filtration through a wire-wound screen tube, and then undergo secondary filtration through the inlet hole on the filter tube to effectively intercept solid particles and prevent clogging of the oil pipe and oil pump.

[0013] 4. The spiral blades force the well fluid to rotate upward in the annulus between the outer cylinder and the lower pipe, using centrifugal force to separate the gas, reduce gas lock, and improve the efficiency of the oil pump.

[0014] 5. The check valve on the valve joint can discharge the separated gas, preventing gas accumulation and pressure imbalance, and further reducing the risk of gas lock.

[0015] 6. The temporary plug plate is secured by a boss limit and a tightening ring thread, and works with a sealing ring to achieve bidirectional tightening and sealing, preventing displacement or leakage caused by high-pressure well fluid impact.

[0016] 7. The clamping ring and coupling and other components support quick disassembly and assembly, which facilitates the inspection or replacement of vulnerable parts such as wire-wound screen tubes and temporary blocking plates, thereby reducing maintenance costs.

[0017] 8. Temporary plugging effectively prevents overflow pollution, ensures a safe working environment, and improves oil well production efficiency, extends equipment life, and comprehensively reduces oil production costs by reducing gas locks, accelerating production, and lowering maintenance frequency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the present invention.

[0019] The components in the attached diagram are named as follows: 1. Upper connector; 2. Valve connector; 3. Check valve; 4. Filter tube; 5. Outer cylinder; 6. Coupling; 7. Lower tube; 8. Lower connector; 9. Temporary plug plate; 10. Sealing ring; 11. Compression ring; 12. Spiral blade; 13. Inlet hole; 14. Wire-wound screen tube; 15. Fixing sleeve; 16. Groove. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Example 1: Refer to Figure 1 As shown, the high-efficiency temporary plugging anti-overflow device includes an upper connector 1, which is fixedly and sealed to a valve connector 2. The lower end of the valve connector 2 is fixedly and sealed to a filter tube 4 and an outer cylinder 5. The filter tube 4 is located inside the outer cylinder 5. The valve connector 2 has an air hole that communicates with the annular cavity between the outer cylinder 5 and the filter tube 4. A one-way valve 3 is installed in the air hole.

[0022] The filter tube 4 has multiple inlet holes 13. The lower end of the filter tube 4 is fixedly and sealed to the upper end of the lower tube 7 by a coupling 6. The lower tube 7 is located inside the outer cylinder 5. The lower end of the lower tube 7 is sealed. The lower end of the lower tube 7 is fixedly and sealed to the lower end of the outer cylinder 5 by a lower connector 8. A temporary blocking plate 9 is detachably and fixedly and sealed inside the lower connector 8.

[0023] Specifically, the temporary plug plate 9 and the inner edge of the lower connector 8 are sealed and connected by a sealing ring 10. The lower connector 8 above the temporary plug plate 9 has a boss machined inside, and the upper end of the temporary plug plate 9 is tightly against the boss. The lower connector 8 below the temporary plug plate 9 has a threaded sealing connection with a compression ring 11, and the upper end of the compression ring 11 is tightly against the lower end of the temporary plug plate 9.

[0024] The temporary plugging plate 9 seals and plugs the lower connector 8. The temporary plugging plate 9 is made of a soluble material, and the lower end of the temporary plugging plate 9 has a concentric groove 16.

[0025] A wire-wound screen tube 14 is fixedly fitted onto the filter tube 4. Multiple inlet holes 13 are located inside the wire-wound screen tube 14. During oil production, the well fluid first passes through the wire-wound screen tube 14 and then enters the filter tube 4 through the inlet holes 13 and ascends. Specifically, two fixed sleeves 15 are fixedly and sealed to the outside of the filter tube 4. The multiple inlet holes 13 are located between the two fixed sleeves 15, and the wire-wound screen tube 14 is located between the two fixed sleeves 15. The upper and lower ends of the wire-wound screen tube 14 are fixedly and sealed to the upper and lower fixed sleeves 15 respectively.

[0026] When temporarily plugging an oil well, this device is connected to the tubing and lowered into the oil well. Since the lower connector 8 is equipped with a temporary plugging plate 9, this device can temporarily plug the well fluid after it is lowered into the well.

[0027] Since the temporary plugging plate 9 is made of a soluble material, after a set time, the temporary plugging plate 9 in contact with the well fluid will dissolve, and then mining operations can be carried out.

[0028] Because the lower end of the temporary plugging plate 9 has a concentric groove 16, and the part of the temporary plugging plate 9 above the groove 16 is thin, when the temporary plugging plate 9 dissolves, the part of the temporary plugging plate 9 above the groove 16 first produces flow holes, which can quickly start production. During the production process, the well fluid flows and washes the temporary plugging plate 9, which can accelerate the dissolution rate of the temporary plugging plate 9 and facilitate rapid full-power mining.

[0029] During extraction, the well fluid rises through the annulus between the lower pipe 7 and the outer cylinder 5 via the lower connector 8. After passing through the wire-wound screen tube 14, the well fluid enters the filter tube 4 through the inlet hole 13 and then rises again. Gas overflowing from the well fluid can be discharged through the one-way valve 3. The wire-wound screen tube 14 can effectively filter the well fluid.

[0030] Example 2: Based on Example 1, referring to... Figure 1 As shown, a spiral blade 12 is fixed on the outside of the lower tube 7, and the outside of the spiral blade 12 is in contact with the inner wall of the outer cylinder 5.

[0031] When the well fluid rises between the outer cylinder 5 and the lower pipe 7, it can rotate upward under the action of the spiral blade 12. The rotating upward well fluid can cause the gas in the well fluid to be rapidly released under the action of centrifugal force, which improves the efficiency of gas-liquid separation.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-efficiency temporary plugging and overflow prevention device, comprising an upper connector (1), characterized in that, The upper connector (1) is fixedly and sealed to the valve connector (2). The lower end of the valve connector (2) is fixedly and sealed to the filter tube (4) and the outer cylinder (5). The filter tube (4) is located inside the outer cylinder (5). The valve connector (2) has an air hole that communicates with the annular cavity between the outer cylinder (5) and the filter tube (4). A one-way valve (3) is installed in the air hole. The filter tube (4) has multiple inlet holes (13). The lower end of the filter tube (4) is fixedly and sealed to the lower tube (7). The lower tube (7) is located inside the outer cylinder (5). A spiral blade (12) is fixed on the outside of the lower tube (7). The lower end of the lower tube (7) The lower end of the lower pipe (7) is fixedly connected to the lower end of the outer cylinder (5) through the lower connector (8). The lower connector (8) is detachably fixed and sealed with a temporary plug plate (9). The temporary plug plate (9) seals the lower connector (8). The temporary plug plate (9) is made of soluble material. The lower end of the temporary plug plate (9) has a groove (16) concentrically opened. A wire-wound screen pipe (14) is fixedly fitted on the filter pipe (4). Multiple inlet holes (13) are located inside the wire-wound screen pipe (14). During the oil production process, the well fluid first passes through the wire-wound screen pipe (14) and then enters the filter pipe (4) through the inlet holes (13) and goes upward.

2. The high-efficiency temporary plugging and overflow prevention device according to claim 1, characterized in that, The lower end of the filter tube (4) is fixedly and sealed to the upper end of the lower tube (7) by a coupling (6).

3. The high-efficiency temporary plugging and overflow prevention device according to claim 1, characterized in that, The temporary plug plate (9) and the inner edge of the lower connector (8) are sealed together by a sealing ring (10). The lower connector (8) above the temporary plug plate (9) has a boss machined inside. The upper end of the temporary plug plate (9) is tightly against the boss. The lower connector (8) below the temporary plug plate (9) is threadedly sealed with a pressure ring (11). The upper end of the pressure ring (11) is tightly against the lower end of the temporary plug plate (9).

4. The high-efficiency temporary plugging and overflow prevention device according to claim 1, characterized in that, The filter tube (4) is fixedly and sealed to two fixed sleeves (15) on the outside. Multiple inlet holes (13) are located between the two fixed sleeves (15). The wire-wound screen tube (14) is located between the two fixed sleeves (15). The upper and lower ends of the wire-wound screen tube (14) are fixedly and sealed to the fixed sleeves (15) on the upper and lower sides respectively.

5. The high-efficiency temporary plugging and overflow prevention device according to claim 1, characterized in that, The outer side of the spiral blade (12) is in contact with the inner wall of the outer cylinder (5).

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