An automatic centering anti-blowout hydraulic pre-tightening seal

Abstract

This utility model provides an automatic centering blowout preventer hydraulic pre-tightening seal, belonging to the technical field of oilfield production equipment. It includes a sucker rod and a hydraulic pre-tightening assembly, which comprises a main sealing rubber sleeve and a hydraulic sealing plunger fitted onto the sucker rod. The sucker rod is equipped with a blowout preventer valve core, a swing ball valve sleeve, and a secondary sealing rubber sleeve. A horizontal sliding sleeve is provided outside the swing ball valve sleeve, and a conical horizontal sliding sleeve is located at the top of the horizontal sliding sleeve. This utility model solves the problem of oil spraying due to sucker rod breakage through the blowout preventer valve core; the hydraulic pre-tightening assembly eliminates the need for frequent manual adjustments, and the main sealing rubber sleeve automatically compensates for the seal, overcoming the drawbacks of manual pre-tightening; the swing ball valve sleeve, in conjunction with the conical horizontal sliding sleeve and the horizontal sliding sleeve, counteracts the eccentric movement of the sucker rod to prevent leakage; and the secondary sealing rubber sleeve allows for quick pressure relief and replacement, preventing oily leaks and environmental pollution.

Description

Technical Field

[0001] This utility model provides an automatic centering anti-blowout hydraulic pre-tightening seal, belonging to the technical field of oilfield production equipment. Background Technology

[0002] Modern wellhead pumping units use rubber packing for sealing the sucker rod and wellhead. The main components include: ① packing box; ② tightening nut; ③ sealing rubber; ④ eccentric sleeve; and ⑤ threaded connection to the wellhead. This older structure is still in use today.

[0003] The above structure can basically meet normal usage needs, but the following problems may easily occur during use:

[0004] 1. Oil spraying problem caused by broken sucker rod of oil pumping unit;

[0005] 2. The sealing rubber and sucker rod wear significantly, requiring frequent manual adjustment by tightening the nut sleeve to adjust the gap between the rubber sleeve and the sucker rod to achieve a sealing effect. This adjustment is generally needed every 3-5 days.

[0006] 3. The problem of concentricity between the sucker rod and the wellhead: First, the up-and-down movement of the pumping unit head causes the sucker rod to move up and down, resulting in eccentricity with the wellhead. The maximum eccentricity is ±5mm, and in older wells, this eccentricity can reach 6mm. Second, the oscillation caused by the up-and-down movement of the sucker rod can cause uneven stress on the main sealing rubber sleeve, which can lead to uneven wear in severe cases. Currently, eccentric sleeves are used to automatically adjust the concentricity, but the effect is not ideal, often causing uneven wear between the sucker rod and the wellhead seal, resulting in leakage.

[0007] 4. Replacing easily worn rubber sleeves requires waiting until the residual pressure is released, which is very time-consuming. Moreover, oil leakage during replacement can easily pollute the environment.

[0008] Based on this, the present invention provides an automatic centering anti-spray hydraulic pre-tightening seal. Utility Model Content

[0009] The technical problems solved by this utility model are: oil spraying caused by sucker rod breakage; significant wear between the sealing rubber and the sucker rod, requiring frequent manual adjustment of the tightening nut to adjust the gap between the rubber sleeve and the sucker rod to achieve a sealing effect; eccentricity in the vertical movement of the sucker rod and wellhead, causing wear and leakage between the sucker rod and wellhead seal; and the need to wait until the residual pressure is completely released before replacing the easily worn rubber sleeve, which is time-consuming and causes greasy leakage that easily pollutes the environment.

[0010] To solve the technical problem, the technical solution provided by this utility model is: an automatic centering anti-blowout hydraulic pre-tightening sealer, including a sucker rod and a main cylinder located outside the sucker rod. The main cylinder is provided with a main plunger sleeve sleeved on the sucker rod, and the sucker rod is provided with an oil well connecting sleeve placed at the bottom of the main cylinder.

[0011] A hydraulic preload assembly, comprising a main sealing rubber sleeve fitted on the sucker rod and placed inside the main plunger sleeve, and a hydraulic sealing plunger, wherein a plunger cap that fits tightly is fitted on the hydraulic sealing plunger;

[0012] The sucker rod is equipped with a blowout preventer core located inside the oil well connecting sleeve;

[0013] The sucker rod is equipped with a swing ball valve sleeve positioned above the blowout preventer core;

[0014] The sucker rod is equipped with a secondary sealing rubber sleeve located inside the swing ball valve sleeve;

[0015] The outside of the swing ball valve sleeve is provided with a horizontal sliding sleeve, and the top of the horizontal sliding sleeve is provided with a tapered horizontal sliding sleeve.

[0016] Furthermore, the hydraulic preload assembly also includes a hydraulic pressure gauge fixedly mounted on one side of the main cylinder and a hydraulic pressure regulating valve fixedly mounted on the other side of the main cylinder.

[0017] Furthermore, the hydraulic preload assembly also includes a main cylinder upper cover that is tightly fitted with the plunger cover and fixedly installed on the top of the main cylinder. The main sealing rubber sleeve is placed at the bottom of the hydraulic sealing plunger, and the main cylinder upper cover is placed on top of the plunger cover. A manual tightening nut is threaded onto the main cylinder upper cover.

[0018] Furthermore, the main sealing rubber sleeve has a conical structure with a length of 50mm, and the material of the main sealing rubber sleeve is high-strength, corrosion-resistant, and wear-resistant rubber.

[0019] Furthermore, the maximum downward displacement compensation distance of the hydraulic sealing plunger is 35mm.

[0020] Furthermore, the oil well connecting sleeve is threaded with a fixing nut sleeve placed outside the tapered horizontal sliding sleeve.

[0021] Furthermore, the main hydraulic cylinder is covered with a dustproof rubber sleeve.

[0022] The beneficial effects of this utility model are:

[0023] The blowout preventer valve core solves the oil spraying problem caused by sucker rod breakage; the hydraulic pre-tightening assembly eliminates the need for frequent manual adjustments, and the conical seal of the main sealing rubber sleeve automatically compensates, overcoming the drawbacks of manual pre-tightening and extending the service life of the main sealing rubber sleeve; the linkage between the swing ball valve sleeve and the conical horizontal sliding sleeve and the horizontal sliding sleeve enables bidirectional self-adaptation of sucker rod swing and eccentric movement, which is used to counteract the eccentric movement of the sucker rod and prevent leakage; the secondary sealing rubber sleeve is pressurized by a manual pressure pump, and the pressure is released after the sealing rubber sleeve is replaced, making replacement convenient and quick, and preventing oily leakage that would cause environmental pollution. Attached Figure Description

[0024] Figure 1 This is a plan view of an automatic centering anti-spray hydraulic pre-tightening seal according to the present invention. Figure 1 .

[0025] Figure 2 This is a plan view of an automatic centering anti-spray hydraulic pre-tightening seal according to the present invention. Figure 2 .

[0026] 1. Oil well connecting sleeve; 2. Blowout preventer core; 3. Swing ball valve sleeve; 4. Secondary sealing rubber sleeve; 5. Main cylinder; 6. Hydraulic pressure regulating valve; 7. Main plunger sleeve; 8. Manual tightening nut; 9. Sucker rod; 10. Plunger gland; 11. Main cylinder upper gland; 12. Hydraulic sealing plunger; 13. Main sealing rubber sleeve; 14. Hydraulic display pressure gauge; 15. Dustproof rubber sleeve; 16. Fixing nut sleeve; 17. Conical horizontal sliding sleeve; 18. Horizontal sliding sleeve. Detailed Implementation

[0027] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly mentioned in this specification are defined relative to their structure and are relative concepts. Therefore, they may vary depending on their location and usage; thus, these or other directional terms should not be interpreted as restrictive terms.

[0028] The singular forms “a,” “the,” and “the” used in this specification are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes one or more of the associated listed items, any or all possible combinations thereof.

[0029] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0030] According to the appendix Figure 1 , 2 As shown: This utility model provides an automatic centering blowout preventer hydraulic pre-tightening seal, including a sucker rod 9 and a main cylinder 5 located outside the sucker rod 9. The main cylinder 5 is covered with a dustproof rubber sleeve 15 to prevent dust. The main cylinder 5 is provided with a main plunger sleeve 7 that is fitted on the sucker rod 9. The sucker rod 9 is provided with an oil well connecting sleeve 1 located at the bottom of the main cylinder 5, which is fixed to the oil well through the oil well connecting sleeve 1.

[0031] As per the instruction manual Figure 1 As shown: The hydraulic preload assembly includes a main sealing rubber sleeve 13 fitted onto the sucker rod 9 and placed inside the main plunger sleeve 7, and a hydraulic sealing plunger 12. The main sealing rubber sleeve 13 has a conical structure and a length of 50mm. The material of the main sealing rubber sleeve 13 is high-strength, corrosion-resistant, and wear-resistant rubber. The maximum downward displacement compensation distance of the hydraulic sealing plunger 12 is 35mm. A plunger gland 10 that fits tightly onto the hydraulic sealing plunger 12 is fitted onto it. The hydraulic preload assembly also includes a main cylinder gland 11 that fits tightly with the plunger gland 10 and is fixedly installed on the top of the main cylinder 5. The main sealing rubber sleeve 13 is placed inside the hydraulic cylinder. The pressure seal plunger 12 is located at the bottom, and the main cylinder upper pressure cover 11 is placed on top of the plunger pressure cover 10. The main cylinder upper pressure cover 11 is threaded with a manual tightening nut 8. The hydraulic pre-tightening assembly also includes a hydraulic display pressure gauge 14 fixedly installed on one side of the main cylinder 5 and a hydraulic pressure regulating valve 6 fixedly installed on the other side of the main cylinder 5. Specifically, the hydraulic display pressure gauge 14 is used to monitor the hydraulic value in real time, and the hydraulic pressure regulating valve 6 is used to adjust and lock the pre-tightening pressure to the hydraulic value corresponding to the working condition of 35℃-45℃ in real time. Dynamic sealing compensation is achieved by driving the hydraulic sealing plunger 12 to press down the main sealing rubber sleeve 13 through the hydraulic oil pressure.

[0032] After installation, carefully check for any errors and then add hydraulic oil through the oil injection hole of the main cylinder pressure cap 11. First, manually tighten the manual nut 8 using an adjustable wrench. Then, start the pumping unit to begin operation. When the pumping unit moves upward, the well begins to pump oil, generating pressure. The main plunger sleeve 7 begins to move upward, compressing the hydraulic oil and entering the upper chamber of the hydraulic sealing plunger 12 through the check valve. Under pressure, the hydraulic sealing plunger 12 begins to move downward, compressing the main sealing rubber sleeve 13, ensuring tight contact between the main sealing rubber sleeve 13 and the sucker rod 9, thus preventing crude oil leakage from the sucker rod. At this point, observe the value of the hydraulic pressure gauge and adjust it using the hydraulic pressure regulating valve 6. The adjustment method is to feel the pressure by hand. When the temperature of the oil rod 9 is between 35℃ and 45℃, observe the pressure reading on the hydraulic pressure gauge 14. At this point, fix the hydraulic pressure regulating valve 6 to complete the adjustment. This ensures that the hydraulic preload of our seal is uniform at all times, guaranteeing that the sucker rod 9 and the main sealing rubber sleeve 13 always have uniform preload. When the main sealing rubber sleeve 13 wears, a gap appears between it and the sucker rod 9. Under hydraulic pressure, the hydraulic sealing plunger 12 moves downward, pressing the main sealing rubber sleeve 13 to begin contracting. The conical seal of the main sealing rubber sleeve 13 automatically compensates, maintaining a constant pressure throughout its operation. This solves the drawbacks of manual preload and extends the service life of the main sealing rubber sleeve 13.

[0033] As per the instruction manual Figure 1 As shown: The sucker rod 9 is equipped with a blowout preventer core 2 located inside the oil well connecting sleeve 1. The blowout preventer core 2 is driven by a spring and crude oil pressure. When the sucker rod 9 is disengaged, it automatically flips and seals. Specifically, during normal operation, the blowout preventer core 2 passes through the sucker rod. In the event of an accident, such as the sucker rod 9 breaking and disengaging from the blowout preventer core 2, the blowout preventer core 2 will automatically flip and move upward under the action of the spring and crude oil pressure, contacting the sealing seat, cutting off the crude oil passage, and preventing crude oil from gushing out and causing environmental pollution. It is used to automatically close and cut off the flow when the sucker rod 9 breaks.

[0034] As per the instruction manual Figure 1 As shown: The sucker rod 9 is equipped with a swing ball valve sleeve 3 positioned above the blowout preventer core 2. Specifically, the swing ball valve sleeve 3 is used to move with the up and down movement of the sucker rod 9, ensuring that the main sealing rubber sleeve 13 is subjected to uniform force. The swing ball valve sleeve 3 is equipped with a horizontal sliding sleeve 18 on the outside, and a conical horizontal sliding sleeve 17 is provided on the top of the horizontal sliding sleeve 18. A fixing nut sleeve 16 is threadedly connected to the well connection sleeve 1 and is positioned outside the conical horizontal sliding sleeve 17. Specifically, the swing ball valve sleeve 3 is linked with the conical horizontal sliding sleeve 17 and the horizontal sliding sleeve 18 to achieve bidirectional self-adaptation of the swing and eccentric movement of the sucker rod 9. This is used to counteract the eccentric movement of the sucker rod 9, maximize the service life of the main sealing rubber sleeve, and solve the problem of manual pre-tightening, achieving the goal of unattended operation and greatly reducing manpower and material resources.

[0035] As per the instruction manual Figure 1 As shown: The sucker rod 9 is equipped with a secondary sealing rubber sleeve 4 located inside the swing ball valve sleeve 3. Specifically, the secondary sealing rubber sleeve 4 is pressurized to 2.5MPa by a manual pressure pump to trigger the seal. It is used for temporary sealing when the main sealing rubber sleeve 13 is replaced, so as to replace the main sealing sleeve without stopping the machine. In order to make the replacement of the main sealing rubber sleeve 13 convenient and quick, during operation, the high-pressure hose of the manual pressure pump needs to be inserted into the M14X1.5 interface to start pressurizing. When the pressure reaches 2.5MPa, the plunger of the secondary sealing cylinder begins to move down, compressing the secondary sealing rubber sleeve 4. At this time, the sucker rod sealing ends, so the main sealing rubber sleeve 13 can be replaced. After the replacement is completed, the manual pressure pump is depressurized, and the secondary sealing rubber sleeve 4 returns to its free state.

[0036] The principle of this utility model

[0037] The hydraulic pre-tightening assembly ensures tight contact between the main sealing rubber sleeve 13 and the sucker rod 9, preventing crude oil leakage from the sucker rod 9. The conical seal of the main sealing rubber sleeve 13 automatically compensates, maintaining a consistent pressure throughout operation. This extends the replacement time of the main sealing rubber sleeve by four times compared to older sealers, reducing manual adjustment work, significantly lowering manpower and material costs, and overcoming the drawbacks of manual pre-tightening. The main sealing rubber sleeve 13's service life is extended. The main cylinder upper pressure cap 11, hydraulic sealing plunger 12, and other components are disassembled and sequentially inserted into the sucker rod 9. The rod is then fixed to the well via the well connection sleeve 1. Hydraulic oil is injected, and the manual pre-tightening nut 8 is manually tightened. The pumping unit operates by adjusting the hydraulic pressure to the pressure value corresponding to the sucker rod temperature of 35℃-45℃ via the hydraulic display pressure gauge 14. After the main sealing rubber sleeve 13 wears, the secondary sealing rubber sleeve 4 is pressurized to 2.5MPa via a manual pressure pump. After replacing the main sealing rubber sleeve 13, the pressure is released and restored. The replacement of the main sealing rubber sleeve 13 is convenient and quick. The swing ball valve sleeve 3 is linked with the conical horizontal sliding sleeve 17 and the horizontal sliding sleeve 18 to counteract the eccentric movement of the sucker rod 9 and prevent leakage. The blowout preventer core 2 is used to automatically close and cut off the flow when the sucker rod 9 breaks, effectively solving the problem of sucker rod breakage and oil spraying in the pumping unit, laying a solid foundation for realizing unattended operation.

[0038] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. An automatic centering anti-blowout hydraulic pre-tightening seal, comprising a sucker rod (9), characterized in that: It also includes a main cylinder (5) located outside the sucker rod (9), a main plunger sleeve (7) sleeved on the sucker rod (9) is provided inside the main cylinder (5), and an oil well connecting sleeve (1) is provided on the sucker rod (9) at the bottom of the main cylinder (5); The hydraulic preload assembly includes a main sealing rubber sleeve (13) fitted on the sucker rod (9) and placed inside the main plunger sleeve (7), and a hydraulic sealing plunger (12), on which a plunger cap (10) fits tightly. The sucker rod (9) is provided with a blowout preventer core (2) placed inside the oil well connecting sleeve (1); The sucker rod (9) is provided with a swing ball valve sleeve (3) positioned above the blowout preventer core (2); The sucker rod (9) is provided with a secondary sealing rubber sleeve (4) placed inside the swing ball valve sleeve (3); The swing ball valve sleeve (3) is provided with a horizontal sliding sleeve (18) on the outside, and a tapered horizontal sliding sleeve (17) is provided on the top of the horizontal sliding sleeve (18).

2. The automatic centering anti-blowout hydraulic pre-tightening seal according to claim 1, characterized in that: The hydraulic preload assembly also includes a hydraulic pressure gauge (14) fixedly mounted on one side of the main cylinder (5) and a hydraulic pressure regulating valve (6) fixedly mounted on the other side of the main cylinder (5).

3. The automatic centering anti-blowout hydraulic pre-tightening seal according to claim 1, characterized in that: The hydraulic preload assembly also includes a main cylinder upper cover (11) that is tightly fitted with the plunger cover (10) and fixedly installed on the top of the main cylinder (5). The main sealing rubber sleeve (13) is placed at the bottom of the hydraulic sealing plunger (12), and the main cylinder upper cover (11) is placed on the top of the plunger cover (10). A manual tightening nut (8) is threaded onto the main cylinder upper cover (11).

4. The automatic centering anti-blowout hydraulic pre-tightening seal according to claim 1, characterized in that: The main sealing rubber sleeve (13) has a conical structure and a length of 50mm. The material of the main sealing rubber sleeve (13) is high-strength, corrosion-resistant and wear-resistant rubber.

5. The automatic centering anti-blowout hydraulic pre-tightening seal according to claim 1, characterized in that: The maximum downward displacement compensation distance of the hydraulic sealing plunger (12) is 35mm.

6. The automatic centering anti-blowout hydraulic pre-tightening seal according to claim 1, characterized in that: The oil well connecting sleeve (1) is threaded with a fixing nut sleeve (16) placed outside the tapered horizontal sliding sleeve (17).

7. The automatic centering anti-blowout hydraulic pre-tightening seal according to claim 1, characterized in that: The main oil cylinder (5) is covered with a dustproof rubber sleeve (15).

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