CN115506742A

CN115506742A - Wellhead multistage sealing device

Info

Publication number: CN115506742A
Application number: CN202211142620.XA
Authority: CN
Inventors: 周为余; 周正权; 周正军; 洪仁全
Original assignee: Funing Petroleum Mechanic Co ltd
Current assignee: Funing Petroleum Mechanic Co ltd
Priority date: 2022-09-20
Filing date: 2022-09-20
Publication date: 2022-12-23

Abstract

The invention discloses a wellhead multistage sealing device, which relates to the technical field of sealing devices and comprises a safety valve, wherein two through grooves are transversely and vertically formed in the safety valve, a plurality of extrusion sealing sleeves are arranged in the top end of the safety valve, extrusion sealing glands are embedded in the extrusion sealing sleeves, a spiral sealing box is arranged on the outer wall of the extrusion sealing sleeves, a spiral sealing sleeve is arranged in the spiral sealing box, a spiral sealing gland is embedded in the spiral sealing box, and a pressing cap is arranged on the outer wall of the spiral sealing box. The invention carries out sealing twice by extruding the sealing sleeve and the spiral sealing sleeve, and the two operate respectively, even if one part is damaged, the other part can operate normally, thereby avoiding leakage.

Description

Wellhead multistage sealing device

Technical Field

The invention relates to the technical field of sealing devices, in particular to a wellhead multistage sealing device.

Background

At present, a wellhead device of a large four-way of a Christmas tree in China petroleum and petrochemical equipment is of a packing disc root type structure, a sucker rod and a packing disc are mutually rubbed in a production process, the packing disc is easy to damage, the sealing effect is not ideal enough, and leakage is easy to generate, so that adverse effects such as environmental pollution, misoperation and the like are caused.

Disclosure of Invention

The invention aims to provide a wellhead multistage sealing device to solve the problems that the sealing effect is poor and leakage is easy to occur in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the multistage sealing device of well head, including the relief valve, two logical grooves have been seted up transversely and vertically in the inside of relief valve, and the internally mounted on relief valve top has a plurality of extrusion seal covers, the inside embedding of extrusion seal cover has extrusion gland, and the outer wall of extrusion seal cover installs spiral seal box, the inside of spiral seal box is provided with spiral seal cover, and the inside embedding of spiral seal box has spiral gland, the pressure cap is installed to spiral seal box's outer wall.

Preferably, the below of relief valve is provided with the clamp, and the bottom of relief valve extends to the inside of clamp, the bottom cover of relief valve outer wall is equipped with the universal joint cover, and the inside clamp outer wall cover of universal joint cover is equipped with the universal joint pad, the clamp outer wall of fixed cover below is fixed with the nut catch.

Preferably, fixed sleeves are fixed at two ends of the outer wall of the safety valve, rotary rods penetrate through the fixed sleeves, one ends of the rotary rods extend to the inner portion of the safety valve, sealing valve clacks are mounted inside the rotary rods, and sealing rings are mounted between the outer wall of the safety valve and the inner wall of the fixed sleeves.

Preferably, the outer wall of the rotating rod is provided with external threads, and the inner wall of one end of the fixing sleeve is provided with internal threads matched with the internal threads.

Preferably, a circular cavity is formed in the sealing valve clack, a cylindrical block with the diameter matched with the diameter is fixed at one end of the rotating rod, and the cylindrical block and the circular cavity are connected in a rotating mode.

Preferably, the cross-sectional shape of the extrusion sealing sleeve is W-shaped, and the extrusion sealing sleeves are stacked inside the safety valve.

Preferably, the connection mode between the spiral sealing gland and the spiral sealing box is threaded connection, and the connection mode between the extrusion sealing gland and the safety valve is threaded connection.

Compared with the prior art, the invention has the beneficial effects that:

1. the extrusion sealing sleeve of the device performs primary sealing, the spiral sealing sleeve also performs primary sealing, and the two parts operate respectively, so that even if one part is damaged, the other part can also operate normally, and leakage is avoided;

2. when leakage occurs, the rotating rods on the two sides are synchronously rotated to drive the sealing valve clacks to move, so that the two sealing valve clacks tightly press the polish rod, and the pressing cap on the top can be loosened to replace the sealing assembly.

Drawings

FIG. 1 is a schematic front sectional view of the present invention;

fig. 2 is a partial front view cross-sectional structure diagram of the present invention.

In the figure: 1. pressing the cap; 2. a spiral sealing gland; 3. a spiral seal cartridge; 4. a spiral seal box; 5. extruding the sealing gland; 6. extruding the sealing sleeve; 7. a safety valve; 8. rotating the rod; 9. sealing the valve clack; 10. a seal ring; 11. fixing a sleeve; 12. a universal joint sleeve; 13. a gimbal pad; 14. a nut lock ring; 15. and (5) clamping the hoop.

Detailed Description

The invention is further described with reference to the following figures and embodiments.

First embodiment

Please refer to fig. 1 and fig. 2 in combination, wherein fig. 1 is a schematic front sectional view illustrating the structure of the present invention; fig. 2 is a partial front view cross-sectional structure diagram of the present invention.

The wellhead multistage sealing device comprises a safety valve 7;

a hoop 15 is arranged below the safety valve 7, the bottom end of the safety valve 7 extends into the hoop 15, a universal joint sleeve 12 is sleeved at the bottom end of the outer wall of the safety valve 7, a universal joint pad 13 is sleeved on the outer wall of the hoop 15 in the universal joint sleeve 12, and a nut locking ring 14 is fixed on the outer wall of the hoop 15 below the fixing sleeve 11;

specifically, as shown in fig. 1, the fixing sleeve 11 is unscrewed to rotate the bottom of the safety valve 7 at any position, and then the fixing sleeve 11 is screwed to fix the bottom, so that the angles of the safety valve 7 and the clamp 15 can be adjusted to ensure that the center of the polish rod and the center of the sealing assembly above the safety valve 7 do not deviate.

Two through grooves are arranged in the safety valve 7 in the transverse and vertical directions;

fixing sleeves 11 are fixed at two ends of the outer wall of the safety valve 7, rotating rods 8 penetrate through the fixing sleeves 11, one ends of the rotating rods 8 extend to the inside of the safety valve 7 and are provided with sealing valve clacks 9, and a sealing ring 10 is arranged between the outer wall of the safety valve 7 and the inner wall of the fixing sleeve 11;

the outer wall of the rotating rod 8 is provided with an external thread, and the inner wall of one end of the fixing sleeve 11 is provided with an internal thread matched with the internal thread;

a circular cavity is formed in the sealing valve clack 9, a cylindrical block with the diameter matched with the rotating rod 8 is fixed at one end of the rotating rod 8, and the cylindrical block and the circular cavity are connected in a rotating mode;

specifically, as shown in fig. 1 and fig. 2, when it is found that the sealing assembly needs to be replaced due to leakage, the rotating rods 8 on both sides can be synchronously rotated, so that the rotating rods 8 push the sealing valve flaps 9 to move, and thus the two sealing valve flaps 9 tightly hold the polish rod, that is, the pressing cap 1 on the top can be loosened to replace the sealing assembly.

A plurality of extrusion seal sleeves 6 are arranged inside the top end of the safety valve 7, extrusion seal glands 5 are embedded inside the extrusion seal sleeves 6, spiral seal boxes 4 are arranged on the outer walls of the extrusion seal sleeves 6, spiral seal sleeves 3 are arranged inside the spiral seal boxes 4, spiral seal glands 2 are embedded inside the spiral seal boxes 4, and press caps 1 are arranged on the outer walls of the spiral seal boxes 4;

the section of the extrusion sealing sleeve 6 is W-shaped, and the extrusion sealing sleeve 6 is stacked in the safety valve 7;

specifically, as shown in fig. 1 and 2, the extrusion seal cartridge 6 of the device performs a primary seal, and the screw seal cartridge 3 also performs a primary seal, and both of them operate independently, and even if one of them is damaged, the other one can operate normally, thereby avoiding leakage.

The connection mode between the spiral sealing gland 2 and the spiral sealing box 4 is threaded connection, and the connection mode between the extrusion sealing gland 5 and the safety valve 7 is threaded connection;

specifically, as shown in fig. 1 and 2, the screw gland 2 and the pressing gland 5 are rotated until the polish rod is sealed without leakage, so that both seal assemblies can be operated at a proper tightness, and if leakage still occurs when the screw gland 2 and the pressing gland 5 are rotated to the maximum position, the seal assemblies are replaced.

The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.

Claims

1. Multistage sealing device of well head, including the relief valve, its characterized in that: two logical grooves have been transversely and vertically seted up to the inside of relief valve, and the internally mounted on relief valve top has a plurality of extrusion seal covers, the inside embedding of extrusion seal cover has extrusion gland, and the outer wall of extrusion seal cover installs spiral seal box, the inside of spiral seal box is provided with spiral seal cover, and the inside embedding of spiral seal box has spiral seal gland, the pressure cap is installed to spiral seal box's outer wall.

2. A wellhead multistage sealing device according to claim 1, characterized in that: the below of relief valve is provided with the clamp, and the bottom of relief valve extends to the inside of clamp, the bottom cover of relief valve outer wall is equipped with the universal joint cover, and the inside clamp outer wall cover of universal joint cover is equipped with the universal joint pad, the clamp outer wall of fixed cover below is fixed with the nut catch.

3. A wellhead multistage sealing device according to claim 1, characterized in that: the both ends of relief valve outer wall all are fixed with fixed cover, and the inside of fixed cover all runs through there is the rotary rod, the one end of rotary rod all extends to the internally mounted of relief valve and has sealed valve clack, install the sealing washer between the inner wall of relief valve outer wall and fixed cover.

4. A wellhead multistage sealing device according to claim 3, characterized in that: the outer wall of the rotating rod is provided with external threads, and the inner wall of one end of the fixing sleeve is provided with internal threads matched with the internal threads.

5. A wellhead multistage sealing device according to claim 3, characterized in that: a circular cavity is formed in the sealing valve clack, a cylindrical block with the diameter matched with the diameter is fixed at one end of the rotating rod, and the cylindrical block is connected with the circular cavity in a rotating mode.

6. A wellhead multistage sealing device according to claim 1, characterized in that: the cross-sectional shape of extrusion seal cover is W type, and extrusion seal cover is in the inside of relief valve and piles up the setting.

7. A wellhead multistage sealing device according to claim 1, characterized in that: the spiral sealing gland and the spiral sealing box are connected in a threaded manner, and the extrusion sealing gland and the safety valve are connected in a threaded manner.