Multifunctional wellhead sealing device

Abstract

The utility model relates to the technical field of oil exploitation equipment, and discloses a multifunctional wellhead sealing device which comprises a two-way clamp holder and an oil pumping polished rod, a sealing box assembly is fixedly installed on the top of the two-way clamp holder, and the oil pumping polished rod is inserted in the sealing box assembly and a center shaft of the two-way clamp holder. The top end of the oil pumping polish rod is communicated with external traction equipment, a conical cavity is formed in an inner cavity of the sealing box assembly, and a spiral packing is wound around the portion, inside the conical cavity, of the surface of the oil pumping polish rod. According to the multifunctional wellhead sealing device, during installation, the lower connector is connected with an external oil pipe tee joint, an oil well oil way is communicated with an inner cavity of the whole device, and the purpose of pumping crude oil is achieved through reciprocating vertical movement of the oil pumping polish rod; the spiral packing abuts against the oil pumping polish rod and the conical cavity of the sealing box assembly, and the effect of sealing the inlet is achieved.

Description

Technical Field

[0001] This utility model relates to the field of oil extraction equipment technology, and more specifically to a multifunctional wellhead sealing device. Background Technology

[0002] Petroleum is a fluid mineral buried deep underground. It is a flammable oily liquid with a distinctive odor and is mainly composed of hydrocarbons. When extracting petroleum, it is necessary to drill oil wellheads in advance, and then crude oil extraction operations are carried out at the wellhead locations.

[0003] Wellhead leakage has always been an unavoidable problem in crude oil extraction. On the one hand, during long-term extraction, various factors such as the surface and subsequent maintenance have exacerbated the problem of wellhead deviation. On the other hand, some oil wells use sucker rods with small clearances between the sucker rod and packing box, and the commonly used wellhead alignment methods cannot effectively correct the deviation, resulting in a weakened wellhead sealing effect and thus causing crude oil leakage.

[0004] In view of this, this utility model proposes a multifunctional wellhead sealing device to solve this problem. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a multifunctional wellhead sealing device to solve the problems existing in the background art.

[0006] This utility model provides the following technical solution: a multi-functional wellhead sealing device, including a bidirectional clamp and a sucker rod. A sealing box assembly is fixedly installed on the top of the bidirectional clamp. The sucker rod is inserted into the central shaft of the sealing box assembly and the bidirectional clamp. The top of the sucker rod is connected to an external traction device. A conical cavity is opened in the inner cavity of the sealing box assembly. A spiral packing is wound around the surface of the sucker rod inside the conical cavity. A pressure cap is threaded onto the top of the sealing box assembly corresponding to the spiral packing. The top of the sucker rod extends to the top side of the pressure cap through the central hole of the pressure cap. An end cap is fixedly installed at the bottom of the bidirectional clamp. A lower connector is fixedly installed at the bottom of the end cap. The bottom of the sucker rod passes through the end cap and the lower connector and extends to the bottom side of the lower connector.

[0007] Furthermore, a packing pad is provided on the top of the spiral packing, and the packing pad is fitted onto the surface of the sucker rod, with the inner top wall of the pressure cap abutting against the inner top wall of the packing pad.

[0008] As a further description of the above technical solution: by setting a packing pressure pad, the squeezing effect of the pressure cap on the spiral packing can be improved, thereby ensuring the sealing effect of the spiral packing on the wellhead.

[0009] Furthermore, the bidirectional clamp includes a housing, the top of which is detachably fitted with a cover by mounting bolts, the bottom end of the sealing assembly is fixed to the upper plane of the cover, the outer wall of the housing is symmetrically threaded with clamping screws, the threaded end of the clamping screws extends into the interior of the housing and is rotatably connected to a clamping block, a blow-off block is provided on the side of the clamping block away from the clamping screws, and a semi-circular groove is opened on the surface of the blow-off block corresponding to the oil sucker rod.

[0010] As a further description of the above technical solution: When it is necessary to seal the inlet, by rotating the two clamping screws at a uniform speed, the clamping blocks drive the two blowout preventers to press against each other. The blowout preventers deform by their own compression, and the semi-circular groove tightly hugs the surface of the sucker rod, thus achieving the effect of sealing the wellhead. This method can effectively address the problem of sucker rod tilting caused by wellhead deviation, achieve the purpose of strengthening the wellhead seal, and facilitate the disassembly and replacement of the spiral packing after this sealing effect.

[0011] Furthermore, the anti-spray block is detachably mounted on the surface of the clamping block, a protrusion is fixedly mounted on the surface of the anti-spray block, a slot is opened on the surface of the clamping block, the protrusion is inserted into the inside of the slot, and a positioning screw is threadedly connected to the side wall of the clamping block, the positioning screw is inserted into the reserved hole on the surface of the protrusion.

[0012] As a further description of the above technical solution: by detachably installing the anti-spray block on the surface of the clamping block, before use, the protrusion on the surface of the anti-spray block can be removed from the slot on the surface of the clamping block by opening the cover and then loosening the positioning screw, so as to achieve the purpose of disassembling and replacing the anti-spray block and avoid the aging of the anti-spray block affecting the sealing effect during later use.

[0013] Furthermore, the inner wall of the end cap is hinged with a blowout preventer plate via a pin.

[0014] As a further description of the above technical solution: by setting a blowout preventer plate, the blowout preventer plate can be pushed upward by the pressure inside the oil well when the sucker rod is pulled out, thereby achieving the purpose of sealing the oil well.

[0015] The technical effects and advantages of this utility model are as follows:

[0016] 1. Compared with existing technologies, this multi-functional wellhead sealing device connects the lower connector to the external tubing tee during installation, and the oil well circuit is connected to the inner cavity of the overall device. The purpose of extracting crude oil is achieved by reciprocating up and down movement of the sucker rod. During use, when it is necessary to seal the wellhead, the pressure cap is rotated to make the spiral packing abut against the conical cavity of the sucker rod and the sealing box assembly, thereby achieving the effect of sealing the inlet.

[0017] 2. Compared with existing technologies, this multi-functional wellhead sealing device, when sealing the inlet is required, uses two clamping screws to rotate at a constant speed. The clamping blocks drive two blowout preventers to press against each other. The blowout preventers deform by their own compression, and the semi-circular grooves tightly hug the surface of the sucker rod, achieving a sealing effect on the wellhead. This method can effectively address the problem of sucker rod tilting caused by wellhead deviation, achieving the purpose of strengthening the wellhead seal. Furthermore, after achieving this sealing effect, it is convenient to disassemble and replace the spiral packing.

[0018] 3. Compared with existing technologies, this multi-functional wellhead sealing device, by setting a packing pressure pad, can improve the compression effect of the pressure cap on the spiral packing, thereby ensuring the sealing effect of the spiral packing on the wellhead; by detachably installing the blowout preventer block on the surface of the clamping block, the protrusion on the surface of the blowout preventer block can be removed from the slot on the surface of the clamping block before use by opening the shell cover and then loosening the positioning screw, so as to realize the purpose of disassembling and replacing the blowout preventer block, avoiding the aging of the blowout preventer block affecting the sealing effect in later use; by setting a blowout preventer plate, when the sucker rod is pulled out, the pressure inside the oil well can be used to push the blowout preventer plate upward, so as to achieve the purpose of sealing the oil well. Attached Figure Description

[0019] Figure 1 This is a partial cross-sectional view of the present invention.

[0020] Figure 2 This is a top-section schematic diagram of the bidirectional clamp of this utility model;

[0021] Figure 3 This is a schematic diagram of the front section structure of the end cap of this utility model.

[0022] The attached figures are labeled as follows: 1. Two-way clamp; 2. Sealing box assembly; 3. Suck rod; 4. Spiral packing; 5. Pressure cap; 6. End cap; 7. Lower connector; 8. Packing gasket; 9. Blowout preventer plate;

[0023] 101. Housing; 102. Housing cover; 103. Clamping screw; 104. Clamping block; 105. Anti-spray block; 106. Semi-circular groove; 107. Protrusion; 108. Slot; 109. Positioning screw. Detailed Implementation

[0024] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The multifunctional wellhead sealing device involved in this utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] Reference Figures 1 to 3 This utility model provides a multifunctional wellhead sealing device, including a bidirectional clamp 1 and a sucker rod 3. A sealing box assembly 2 is fixedly installed on the top of the bidirectional clamp 1. The sucker rod 3 is inserted into the central axis of the sealing box assembly 2 and the bidirectional clamp 1. The top end of the sucker rod 3 is connected to an external traction device.

[0026] The inner cavity of the sealing box assembly 2 is provided with a conical cavity. The surface of the sucker rod 3 is wound with a spiral packing 4 inside the conical cavity. The top of the sealing box assembly 2 is threaded with a pressure cap 5 corresponding to the spiral packing 4. The top of the sucker rod 3 extends to the top side of the pressure cap 5 through the center hole of the pressure cap 5. The bottom end of the bidirectional clamp 1 is fixedly installed with an end cap 6. The bottom end of the end cap 6 is fixedly installed with a lower connector 7. The bottom end of the sucker rod 3 passes through the end cap 6 and the lower connector 7 and extends to the bottom side of the lower connector 7.

[0027] It is worth noting that during installation, the lower connector 7 is connected to the external tubing tee, and the oil well circuit is connected to the inner cavity of the overall device. The oil is extracted by the reciprocating up and down movement of the sucker rod 3. During use, when it is necessary to seal the wellhead, the pressure cap 5 is rotated to make the spiral packing 4 press against the sucker rod 3 and the conical cavity of the sealing box assembly 2, thereby achieving the effect of sealing the inlet.

[0028] A packing pad 8 is placed on top of the spiral packing 4. The packing pad 8 is fitted onto the surface of the sucker rod 3, and the inner top wall of the cap 5 is pressed against the inner top wall of the packing pad 8.

[0029] Furthermore, by setting the packing pressure pad 8, the squeezing effect of the pressure cap 5 on the spiral packing 4 can be improved, thereby ensuring the sealing effect of the spiral packing 4 on the wellhead.

[0030] The bidirectional clamp 1 includes a housing 101. A cover 102 is detachably mounted on the top of the housing 101 by mounting bolts. The bottom end of the sealing assembly 2 is fixed to the upper surface of the cover 102. A clamping screw 103 is symmetrically threaded to the outer wall of the housing 101. The threaded end of the clamping screw 103 extends into the interior of the housing 101 and is rotatably connected to a clamping block 104. A blowout preventer block 105 is provided on the side of the clamping block 104 away from the clamping screw 103. A semi-circular groove 106 is opened on the surface of the blowout preventer block 105 corresponding to the oil extraction rod 3.

[0031] It is worth noting that when the inlet needs to be sealed, this multi-functional wellhead sealing device rotates the two clamping screws 103 at a constant speed, and the clamping block 104 drives the two blowout preventer blocks 105 to press against each other. The blowout preventer blocks 105 deform by their own compression, and the semi-circular groove 106 tightly hugs the surface of the sucker rod 3, thus achieving the effect of sealing the wellhead. This method can effectively deal with the problem of the sucker rod 3 tilting caused by the wellhead deviation, and achieve the purpose of strengthening the wellhead seal. Moreover, after this sealing effect, it is convenient to disassemble and replace the spiral packing 4.

[0032] The anti-spray block 105 is detachably mounted on the surface of the clamping block 104. A protrusion 107 is fixedly mounted on the surface of the anti-spray block 105. A slot 108 is opened on the surface of the clamping block 104. The protrusion 107 is inserted into the slot 108. A positioning screw 109 is threadedly connected to the side wall of the clamping block 104. The positioning screw 109 is inserted into the reserved hole on the surface of the protrusion 107.

[0033] Furthermore, since the anti-spray block 105 is detachably installed on the surface of the clamping block 104, before use, the protrusion 107 on the surface of the anti-spray block 105 can be removed from the slot 108 on the surface of the clamping block 104 by opening the cover 102 and then loosening the positioning screw 109, so as to achieve the purpose of disassembling and replacing the anti-spray block 105 and avoiding the aging of the anti-spray block 105 from affecting the sealing effect during later use.

[0034] The inner wall of the end cap 6 is hinged with a blowout preventer plate 9 via a pin.

[0035] Furthermore, by setting the blowout preventer plate 9, when the sucker rod 3 is pulled out, the pressure inside the oil well can be used to push the blowout preventer plate 9 upward, thereby achieving the purpose of sealing the oil well.

[0036] Finally, it should be noted that the accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

Claims

1. A multi-functional wellhead sealing device, comprising a bidirectional clamp (1) and a sucker rod (3), characterized in that: The top of the bidirectional clamp (1) is fixedly installed with a sealing box assembly (2). The sucker rod (3) is inserted into the central axis of the sealing box assembly (2) and the bidirectional clamp (1). The top end of the sucker rod (3) is connected to an external traction device. The inner cavity of the sealing box assembly (2) is provided with a conical cavity. The surface of the sucker rod (3) is wound with a spiral packing (4) inside the conical cavity. The top of the sealing box assembly (2) is threaded with a pressure cap (5) corresponding to the spiral packing (4). The top end of the sucker rod (3) extends to the top side of the pressure cap (5) through the central hole of the pressure cap (5). The bottom end of the bidirectional clamp (1) is fixedly installed with an end cap (6). The bottom end of the end cap (6) is fixedly installed with a lower connector (7). The bottom end of the sucker rod (3) passes through the end cap (6) and the lower connector (7) and extends to the bottom side of the lower connector (7).

2. The multifunctional wellhead sealing device according to claim 1, characterized in that: The top of the spiral packing (4) is provided with a packing pad (8), which is fitted onto the surface of the sucker rod (3). The inner top wall of the pressure cap (5) is pressed against the inner top wall of the packing pad (8).

3. The multifunctional wellhead sealing device according to claim 1, characterized in that: The bidirectional clamp (1) includes a housing (101), and a cover (102) is detachably installed on the top of the housing (101) by mounting bolts. The bottom end of the sealing box assembly (2) is fixed to the upper surface of the cover (102). A clamping screw (103) is symmetrically threaded on the outer wall of the housing (101). The threaded end of the clamping screw (103) extends into the interior of the housing (101) and is rotatably connected to a clamping block (104). A blowout block (105) is provided on the side of the clamping block (104) away from the clamping screw (103). A semi-circular groove (106) is opened on the surface of the blowout block (105) corresponding to the oil sucker rod (3).

4. The multifunctional wellhead sealing device according to claim 3, characterized in that: The anti-spray block (105) is detachably installed on the surface of the clamping block (104). A protrusion (107) is fixedly installed on the surface of the anti-spray block (105). A slot (108) is opened on the surface of the clamping block (104). The protrusion (107) is inserted into the inside of the slot (108). A positioning screw (109) is threadedly connected to the side wall of the clamping block (104). The positioning screw (109) is inserted into the reserved hole on the surface of the protrusion (107).

5. The multifunctional wellhead sealing device according to claim 1, characterized in that: The inner wall of the end cap (6) is hinged with a blowout preventer plate (9) by a pin.

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