CN201116459Y

CN201116459Y - Well head sealer

Info

Publication number: CN201116459Y
Application number: CNU2007200920061U
Authority: CN
Inventors: 张辛贤
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-09-28
Filing date: 2007-09-28
Publication date: 2008-09-17
Anticipated expiration: 2017-09-28

Abstract

The utility model discloses a wellhead sealer, which comprises a blowout preventing valve, a wellhead connector arranged at the lower end of the blowout prevention valve, a packing and a dust seal. The wellhead sealer is characterized in that the blowout preventing valve and the packing are connected by a universal joint, L-shaped pawls which are arranged in the left and the right sides of the center of the blowout prevention valve are in hinge connection on the shell casing of the blowout preventing valve, wherein the front end of the pawl is provided with a groove while the rear end is in hinge connection with a piston of a hydraulic cylinder. The upper portion of the universal joint is connected with the packing via a maintenance-free bearing, the packing is composed of an upper packing and a lower packing which are separated from top to bottom, the maintenance-free bearing is arranged at the end of the upper packing, and the dust seal is arranged on the top portion of the maintenance-free bearing. The wellhead sealer has the advantages of simple structure, good tightening effect, wide application, stabilization and endurance, strong sealing property, high resistance to pressure and abrasion and long service life.

Description

Wellhead sealing device

Technical field

The utility model relates to a kind of oil pumping well mouth of oil well sealer.

Background technology

At present, the sealing of oil field pumping well well head is normally installed a kind of packing box in the well head upper end, and the annular packing of packing in packing box prevents to take place when well head from moving up and down because of polished rod oil leakage phenomenon as the sealing to wellhead polish rod.The sealing effectiveness of this sealing device is undesirable, and application life is short, and replacing is wasted time and energy.

Summary of the invention

The purpose of the present utility model is to overcome the deficiencies in the prior art, and provides a kind of simple in structure, and is fastening effective, highly versatile, antitheft good, the wellhead sealing device of raising output.

The technical solution of the utility model is as follows: wellhead sealing device, comprise: blowout prevention valve, be arranged on the well head joint of blowout prevention valve lower end, packing and the sealing of shelves dirt, it is characterized in that: be connected by universal joint between described blowout prevention valve and the packing, the top of described universal joint links to each other with packing by self-lubricating bearing.

Aforesaid wellhead sealing device is characterized in that: the and arranged on left and right sides of described blowout prevention valve center is provided with L shaped pawling, and pawling is hinged on the blowout prevention valve housing, and the front end of pawling is provided with groove, and rear end and hydraulic cylinder piston are hinged.

Aforesaid wellhead sealing device is characterized in that: described two are provided with a screw rod between pawling, and the cross nut is installed on the screw rod.

Aforesaid wellhead sealing device is characterized in that; Described cross nut places two to pawl in the groove of front end.

Aforesaid wellhead sealing device is characterized in that: described hydraulic cylinder piston is provided with caulking gum.

Aforesaid wellhead sealing device is characterized in that: described packing independently goes up packing up and down by two and following packing is formed.

Aforesaid wellhead sealing device is characterized in that: the described end of going up packing is equipped with self-lubricating bearing.

Aforesaid wellhead sealing device is characterized in that: the top of described self-lubricating bearing is provided with a grade dirt sealing.

Advantage and good effect: the utility model is simple in structure, and is fastening effective, highly versatile, and sturdy and durable, sealing is strong, and is high pressure resistant, and abrasion resistance is strong, the characteristics of long service life.

Description of drawings

Fig. 1 is the utility model topology view

Fig. 2 is that the utility model A-A is to sectional view

The specific embodiment

Below in conjunction with description of drawings the utility model is further elaborated.

As Fig. 1～Fig. 2 is preferred version of the present utility model: shown: blowout prevention valve 2, be arranged on the well head joint 1 of blowout prevention valve 2 lower ends, packing and shelves dirt sealing 8, it is characterized in that: be connected by universal joint 3 between described blowout prevention valve 2 and the packing, the top of described universal joint 3 links to each other with packing by self-lubricating bearing 4.

Aforesaid wellhead sealing device is characterized in that: the and arranged on left and right sides of described blowout prevention valve 2 centers is provided with L shapedly pawls 9, pawl 9 to be hinged on the housing of blowout prevention valve 2, and 9 the front end of pawling is provided with groove 10, and rear end and hydraulic cylinder piston 11 are hinged.

Aforesaid wellhead sealing device is characterized in that: described two pawl 9 is provided with a screw rod 12, and cross nut 13 is installed on the screw rod 12.

Aforesaid wellhead sealing device is characterized in that; Described cross nut 13 places two to pawl in the groove 10 of 9 front ends.

Aforesaid wellhead sealing device is characterized in that: described hydraulic cylinder piston 11 is provided with caulking gum 14.

Aforesaid wellhead sealing device is characterized in that: described packing independently goes up packing 6 up and down by two and following packing 5 is formed.

Aforesaid wellhead sealing device is characterized in that: the described end of going up packing 6 is equipped with self-lubricating bearing 7.

Aforesaid wellhead sealing device is characterized in that: the top of described self-lubricating bearing 7 is provided with a grade dirt sealing 8.

Operating principle:

Blowout prevention valve 2 plays primary seal, and the double function of doing blowout prevention valve, and it has changed traditional cross piston bore both sides two-piston, and respectively operation separately was not only inconvenient but also easily cause the disadvantage of artificial eccentric wear.Change one handle now into and handle the structure that two-piston dextrorotation, derotation can close and decontrol, simple to operate, and balance between two forces, can not produce eccentric wear.In equipment, be provided with simultaneously universal joint 3 joints, the packing 5,6 of this equipment can tilt along with the incline direction of polished rod, packing 5,6 remains concentric with polished rod among housing, stopped the eccentric wear phenomenon, added twice self-lubricating bearing 4,7 at the two ends up and down of packing 5,6, two bearings is set upright polished rod and is positioned the center up and down, and self-lubricating has prolonged the application life of equipment greatly; The twice packing 5,6 up and down; packing 5 below using earlier; if find that tiny leakage is arranged, tightly screw on shell with a period of time, when regulating when falling the limit; recur with second packing; need not to shut down and change packing, when also being adjusted to the limit for second, change two packings 5,6 together; reduce the replacing packing cycle like this, improved the unit crude oil yield.

Packing 5,6 is provided with the twice anti-theft ring, so the pressure-pad of packing can only dextrorotation, can not backspin, and except that the operator, nobody can open, thereby effectively plays antitheft effect; The shelves dirt sealing 8 of equipment top can effectively have been avoided dust storm attached on the polished rod, and brought in housing and the packing by polished rod, influences sealing effectiveness.

The above, it only is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified to the equivalent embodiment of equivalent variations, but every technical solutions of the utility model content that do not break away from,, all still belong in the scope of technical solutions of the utility model any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present utility model.

Claims

1, wellhead sealing device, comprise: blowout prevention valve (2), be arranged on the well head joint (1) of blowout prevention valve (2) lower end, packing and shelves dirt sealings (8), it is characterized in that: be connected by universal joint (3) between described blowout prevention valve (2) and the packing, the top of described universal joint (3) links to each other with packing by self-lubricating bearing (4).

2, wellhead sealing device according to claim 1, it is characterized in that: the and arranged on left and right sides of described blowout prevention valve (2) center is provided with L shaped pawling (9), pawl (9) be hinged on the housing of blowout prevention valve (2), and the front end of pawl (9) is provided with groove (10), and rear end and hydraulic cylinder piston (11) are hinged.

3, wellhead sealing device according to claim 2 is characterized in that: described two pawl is provided with a screw rod (12) between (9), and on the screw rod (12) cross nut (13) is installed.

4, wellhead sealing device according to claim 3 is characterized in that: described cross nut (13) places two to pawl in the groove (10) of (9) front end.

5, wellhead sealing device according to claim 2 is characterized in that: described hydraulic cylinder piston (11) is provided with caulking gum (14).

6, wellhead sealing device according to claim 1 is characterized in that: described packing independently goes up packing (6) up and down by two and following packing (5) is formed.

7, wellhead sealing device according to claim 6 is characterized in that: the described end of going up packing (6) is equipped with self-lubricating bearing (7).

8, wellhead sealing device according to claim 7 is characterized in that: the top of described self-lubricating bearing (7) is provided with a grade dirt sealing (8).