CN111852377A

CN111852377A - Wellhead assembly

Info

Publication number: CN111852377A
Application number: CN202010701088.5A
Authority: CN
Inventors: 不公告发明人
Original assignee: Individual
Current assignee: Daqing Ruiside Petroleum Machinery Manufacturing Co ltd
Priority date: 2020-07-20
Filing date: 2020-07-20
Publication date: 2020-10-30
Anticipated expiration: 2040-07-20
Also published as: CN111852377B

Abstract

The invention provides a wellhead device, and relates to the technical field of oil field drilling. This wellhead assembly, including the oil recovery well head, the upper end of oil recovery well head is provided with the protective housing, the protective housing includes casing and last casing down, go up casing fixed connection casing upper end down, the lower pot head of casing is established in the upper portion outer end of oil recovery well head down, the bottom of casing passes through many first connecting bolt fixed connection with the oil recovery well head down, the casing is provided with the sealing washer with the oil recovery well head outside of meeting department down, the sealing washer passes through the bottom fixed connection of many second connecting bolt and casing down, the inside top department of being close to of casing is provided with slide bar and two-way lead screw down. The oil and gas sprayed out from the well mouth can be completely sealed at the inner end of the device through the well mouth device, and the Christmas tree can not be filled with the oil and gas, so that the possibility of leakage of the oil and gas is greatly reduced, and the safety of oil extraction is ensured.

Description

Wellhead assembly

Technical Field

The invention relates to the technical field of oil field drilling, in particular to a wellhead device.

Background

The wellhead device is a device which is arranged at a wellhead, hangs a casing and an oil pipe and seals annular spaces of the oil pipe, the casing and each layer of casing in petroleum and natural gas drilling. Generally comprises a casing head, a tubing head and a blowout preventer group.

Among the prior art, the production tree is all direct mount on the production well head, then install sealed blowout preventer on the production tree top, this kind of structure seals the production well head in the use, oil and gas still are located production tree inner, and be provided with a plurality of exports on the production tree, even every export all sets up sealing device, still have the probability of revealing, the security performance can not guarantee completely, so need design a wellhead assembly to guarantee when sealing the oil well, can not have a large amount of oil and gas in the production tree.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a wellhead device, and solves the problem that the Christmas tree is still filled with oil and gas after the oil well is closed at present, and leakage is easy to occur.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: the wellhead device comprises an oil extraction wellhead, wherein a protective shell is arranged at the upper end of the oil extraction wellhead, the protective shell comprises a lower shell and an upper shell, the upper shell is fixedly connected at the upper end of the lower shell, the lower end of the lower shell is sleeved at the outer end of the upper part of the oil extraction wellhead, the bottom end of the lower shell is fixedly connected with the oil extraction wellhead through a plurality of first connecting bolts, a sealing ring is arranged at the outer part of the joint of the lower shell and the oil extraction wellhead, the sealing ring is fixedly connected with the bottom end of the lower shell through a plurality of second connecting bolts, a sliding rod and a bidirectional lead screw are arranged in the lower shell close to the top end, the sliding rod and the bidirectional lead screw are horizontally placed and kept parallel, two ends of the sliding rod are respectively and fixedly connected on the side wall of the lower shell, a first bearing and a second bearing are fixedly embedded and connected on the side wall of the, the other end of the bidirectional screw rod penetrates through the second bearing and the side wall of the lower shell and is fixedly connected with a first rotating hand wheel, a first sealing plate and a second sealing plate are sleeved on the rod body of the bidirectional screw rod in a threaded manner, one ends of the first sealing plate and the second sealing plate, which are far away from the bidirectional screw rod, are sleeved on the rod body of the sliding rod, the outer wall of the middle end of the upper shell is fixedly connected with a thickening block, the inner end of the thickening block is provided with a placing groove and a threaded hole, one end of the threaded hole is communicated with the placing groove, the other end of the threaded hole penetrates through the thickening block to the outer end, a movable groove is arranged in the middle end of the upper shell, one end of the movable groove is communicated with the placing groove, the inner of the placing groove is provided with a sealing plate, one side wall of the sealing plate, which is close to the threaded hole, is rotatably connected with a screw rod, and the other end of the screw rod penetrates through the threaded hole and is fixedly connected with a second rotating hand wheel.

Preferably, the bottom end of the lower shell is set to be cylindrical with the upper end closed, and the inner diameter of the bottom end of the lower shell is matched with the outer diameter of the oil extraction wellhead.

Preferably, a first sealing gasket is sleeved on the rod body of the bidirectional screw rod close to the second bearing, and the first sealing gasket is fixedly embedded on the inner wall of the lower shell.

Preferably, the first closing plate and the second closing plate have the same specification and are both arranged in a semicircular arc plate shape, the first closing plate and the second closing plate are symmetrically arranged based on the central axis of the lower shell, and the top ends of the first closing plate and the second closing plate are attached to the top end of the lower shell in a seamless mode.

Preferably, two sealing strips are fixedly connected to the side wall of the first closing plate close to the second closing plate.

Preferably, two sealing grooves are formed in the side wall, close to the first closing plate, of the second closing plate.

Preferably, the sizes of the two sealing strips are matched with the sizes of the inner parts of the two sealing grooves.

Preferably, the rod body of the screw rod close to the upper shell is sleeved with a second sealing gasket, and the second sealing gasket is fixedly embedded on the side wall of the upper shell.

The working principle is as follows: when the device is used, a protective shell of the device is fixed on an oil extraction well head through a connecting bolt, then a sealing ring is arranged outside the joint of the protective shell and the oil extraction well head to ensure the sealing of the joint of the protective shell and the oil extraction well head, when an oil well reservoir is reformed, a Christmas tree can be directly fixed at the top end of the protective shell, when an oil well needs to be sealed, a first rotating hand wheel is rotated to drive a bidirectional screw rod to rotate, the bidirectional screw rod drives a first sealing plate and a second sealing plate to move towards the middle until the opposite side walls of the first sealing plate and the second sealing plate are seamlessly attached to each other to block an oil inlet of an upper shell, at the moment, two inserting strips of the first sealing plate are inserted into two sealing grooves of the second sealing plate to form two seals, then a second rotating hand wheel is rotated to drive a screw rod to rotate, the screw rod moves towards the inner side of the upper shell in a threaded hole when the screw rod rotates, until the sealing plate plugs up the through hole at the inner end of the upper shell, the oil and gas at the oil extraction well head are completely sealed, and the leakage condition can not occur.

(III) advantageous effects

The invention provides a wellhead assembly. The method has the following beneficial effects:

the invention designs a wellhead device which is arranged between an inlet and a Christmas tree, and is internally provided with two sealing devices, so that when oil extraction is stopped, oil and gas sprayed out of the wellhead can be completely sealed at the inner end of the device through the device, and the Christmas tree is ensured not to be filled with the oil and the gas, thereby greatly reducing the possibility of oil and gas leakage and ensuring the safety of oil extraction.

Drawings

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

FIG. 2 is a cross-sectional view of the structure of the present invention;

FIG. 3 is a schematic view of the top end of the interior of the lower housing of the present invention;

FIG. 4 is an enlarged view taken at A of FIG. 2 in accordance with the present invention;

FIG. 5 is a schematic diagram of a first sealing plate structure according to the present invention;

FIG. 6 is a schematic diagram of a second sealing plate according to the present invention.

Wherein, 1, an oil extraction wellhead; 2. a protective shell; 201. a lower housing; 202. an upper housing; 3. a first connecting bolt; 4. a seal ring; 5. a second connecting bolt; 6. a slide bar; 7. a bidirectional screw rod; 8. a first closing plate; 9. a second closing plate; 10. a first bearing; 11. a second bearing; 12. a first gasket; 13. a sealing strip; 14. a sealing groove; 15. a first rotating hand wheel; 16. thickening blocks; 17. a placement groove; 18. a movable groove; 19. a sealing plate; 20. a threaded hole; 21. a screw; 22. a second gasket; 23. a second rotating hand wheel.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b):

as shown in fig. 1-6, an embodiment of the present invention provides a wellhead device, including an oil production wellhead 1, a protective housing 2 is disposed at an upper end of the oil production wellhead 1, the protective housing 2 includes a lower housing 201 and an upper housing 202, the upper housing 202 is fixedly connected to an upper end of the lower housing 201, a lower end of the lower housing 201 is sleeved on an upper outer end of the oil production wellhead 1, a bottom end of the lower housing 201 is fixedly connected to the oil production wellhead 1 through a plurality of first connecting bolts 3, a sealing ring 4 is disposed outside a joint of the lower housing 201 and the oil production wellhead 1, the sealing ring 4 is fixedly connected to a bottom end of the lower housing 201 through a plurality of second connecting bolts 5, a lower end of the sealing ring 4 is completely attached to the joint of the lower housing 201 and the oil production wellhead 1, a sliding rod 6 and a bidirectional screw rod 7 are disposed inside the lower housing 201 near a top end, the sliding rod 6 and the bidirectional screw rod, a first bearing 10 and a second bearing 11 are fixedly embedded and connected on the side wall of a lower shell 201 at two ends of a bidirectional screw rod 7 respectively, one end of the bidirectional screw rod 7 is rotatably arranged at the inner end of the first bearing 10, the other end of the bidirectional screw rod 7 penetrates through the second bearing 11 and the side wall of the lower shell 201 and is fixedly connected with a first rotating hand wheel 15, a first sealing plate 8 and a second sealing plate 9 are sleeved on a rod body of the bidirectional screw rod 7 in a threaded manner, one ends of the first sealing plate 8 and the second sealing plate 9 far away from the bidirectional screw rod 7 are sleeved on a rod body of a sliding rod 6, a thickening block 16 is fixedly connected on the outer wall of the middle end of an upper shell 202, the thickening block 16 is fixedly welded on the upper shell 202, a placing groove 17 and a threaded hole 20 are arranged at the inner end of the thickening block 16, one end of the threaded hole 20 is communicated with the placing groove 17, the other end of the threaded hole 20 penetrates, one end of the movable groove 18 is communicated with the placing groove 17, a sealing plate 19 is arranged at the inner end of the placing groove 17, the cross section of the sealing plate 19 is matched with the cross sections of the placing groove 17 and the movable groove 18, a side wall, close to the threaded hole 20, of the sealing plate 19 is rotatably connected with a screw rod 21, and the other end of the screw rod 21 penetrates through the threaded hole 20 and a second rotary hand wheel 23 fixedly connected with the threaded hole 20.

The bottom end of the lower shell 201 is set to be cylindrical with a sealed upper end, the inner diameter of the bottom end of the lower shell 201 is matched with the outer diameter of the oil production well head 1, so that good sealing performance between the lower shell 201 and the oil production well head 1 is guaranteed, a first sealing gasket 12 is sleeved on a rod body of the two-way screw 7 close to the second bearing 11, the first sealing gasket 12 is fixedly embedded on the inner wall of the lower shell 201, the first sealing plate 8 and the second sealing plate 9 are identical in specification and are both set to be semi-circular-arc-shaped, the first sealing plate 8 and the second sealing plate 9 are symmetrically arranged based on the central shaft of the lower shell 201, the top ends of the first sealing plate 8 and the second sealing plate 9 are both in seamless fit with the top end of the lower shell 201, two sealing strips 13 are fixedly connected on the side wall of the first sealing plate 8 close to the second sealing plate 9, two sealing grooves 14 are formed on the side wall of the second sealing, the sizes of the two sealing strips 13 are matched with the sizes of the insides of the two sealing grooves 14, the two sealing strips 13 are completely inserted into the two sealing grooves 14 when the first sealing plate 8 and the second sealing plate 9 are attached together through the design, two seals are formed, the sealing performance between the first sealing plate 8 and the second sealing plate 9 is greatly improved, the second sealing gasket 22 is sleeved on the rod body of the screw 21 close to the upper shell 202, and the second sealing gasket 22 is fixedly embedded on the side wall of the upper shell 202.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. Wellhead assembly, including oil recovery wellhead (1), its characterized in that: the oil extraction wellhead assembly is characterized in that a protective shell (2) is arranged at the upper end of the oil extraction wellhead (1), the protective shell (2) comprises a lower shell (201) and an upper shell (202), the upper shell (202) is fixedly connected to the upper end of the lower shell (201), the lower end of the lower shell (201) is sleeved at the outer end of the upper portion of the oil extraction wellhead (1), the bottom end of the lower shell (201) is fixedly connected with the oil extraction wellhead (1) through a plurality of first connecting bolts (3), a sealing ring (4) is arranged outside the joint of the lower shell (201) and the oil extraction wellhead (1), the sealing ring (4) is fixedly connected with the bottom end of the lower shell (201) through a plurality of second connecting bolts (5), a sliding rod (6) and a bidirectional screw rod (7) are arranged inside the lower shell (201) close to the top end, the sliding rod (6) and the bidirectional screw rod (7) are horizontally arranged and kept parallel, two ends of the sliding rod (6) are respectively and, a first bearing (10) and a second bearing (11) are fixedly and fixedly embedded in side walls of a lower shell (201) at two ends of the bidirectional screw rod (7) respectively, one end of the bidirectional screw rod (7) is rotatably arranged at the inner end of the first bearing (10), the other end of the bidirectional screw rod (7) penetrates through the side walls of the second bearing (11) and the lower shell (201) and is fixedly connected with a first rotating hand wheel (15), a first sealing plate (8) and a second sealing plate (9) are sleeved on a rod body of the bidirectional screw rod (7) in a threaded manner, one ends, far away from the bidirectional screw rod (7), of the first sealing plate (8) and the second sealing plate (9) are sleeved on the rod body of the sliding rod (6), a thickening block (16) is fixedly connected on the outer wall of the middle end of the upper shell (202), a placement groove (17) and a threaded hole (20) are formed in the inner end of the thickening block (16), and one end of the threaded hole (20) is communicated with, the utility model discloses a quick-witted, including casing (202), threaded hole (20), movable groove (18) have been seted up to upper housing (202) middle-end inside, threaded hole (20) other end runs through thickened block (16) and leads to the outer end, movable groove (18) have been seted up to upper housing (202) middle-end inside, movable groove (18) one end and standing groove (17) through connection, standing groove (17) inner is provided with closing plate (19), closing plate (19) are close to a lateral wall rotation of threaded hole (20) and are connected with screw rod (21), screw rod (21) other end passes threaded hole (20) and.

2. A wellhead assembly as claimed in claim 1, in which: the bottom end of the lower shell (201) is set to be cylindrical with the upper end closed, and the inner diameter of the bottom end of the lower shell (201) is matched with the outer diameter of the oil production well head (1).

3. A wellhead assembly as claimed in claim 1, in which: the shaft body of the two-way screw rod (7) close to the second bearing (11) is sleeved with a first sealing gasket (12), and the first sealing gasket (12) is fixedly embedded on the inner wall of the lower shell (201).

4. A wellhead assembly as claimed in claim 1, in which: the first closing plate (8) and the second closing plate (9) are identical in specification and are arranged in a semicircular arc plate shape, the first closing plate (8) and the second closing plate (9) are symmetrically arranged based on the central axis of the lower shell (201), and the top ends of the first closing plate (8) and the second closing plate (9) are attached to the top end of the lower shell (201) in a seamless mode.

5. A wellhead assembly as claimed in claim 1, in which: and two sealing strips (13) are fixedly connected to the side wall of the first closing plate (8) close to the second closing plate (9).

6. A wellhead assembly as claimed in claim 1, in which: two sealing grooves (14) are formed in the side wall, close to the first closing plate (8), of the second closing plate (9).

7. A wellhead assembly according to claims 5 and 6, in which: the sizes of the two sealing strips (13) are matched with the inner sizes of the two sealing grooves (14).

8. A wellhead assembly as claimed in claim 1, in which: the screw rod (21) is close to and is equipped with second sealed pad (22) on the pole body of last casing (202), second sealed pad (22) are fixed to be inlayed and are established on last casing (202) lateral wall.