CN2551758Y

CN2551758Y - Annular blowout preventer for well drilling

Info

Publication number: CN2551758Y
Application number: CN 02232890
Authority: CN
Inventors: 许宏奇; 杨永宁; 孟宪宁
Original assignee: RONGSHENG MACHINERY MANUFACTURE Ltd OF HUABEI OILFIELD
Current assignee: RONGSHENG MACHINERY MANUFACTURE Ltd OF HUABEI OILFIELD
Priority date: 2002-05-23
Filing date: 2002-05-23
Publication date: 2003-05-21
Anticipated expiration: 2012-05-23

Abstract

An annular blowout preventer for well drilling relates to oil well drilling control equipment, and belongs to an oil well drilling accessory device. The main problem of solving is, current annular preventer seals unreliable, dismouting inconvenient when changing the part. The annular blowout preventer mainly comprises a shell, a piston, a rubber core, a supporting cylinder and a dust ring, wherein the piston, the rubber core, the supporting cylinder and the dust ring are arranged in the shell. The blowout preventer is used in oil drilling engineering.

Description

A kind of drilling well annular preventer

Technical field

The utility model relates to a kind of oil drilling control appliance, belongs to the oil drilling fixture.

Background technology

If in drilling process when running into high-pressure oil-gas layer, just well kick or gas blowout accident may take place.Former because of not being equipped with preventer or repeatedly blowout out of control accident taking place because of preventer loses efficacy, bring about great losses, therefore in the oil drilling engineering, must be equipped with preventer, when needs, can in time seal well head, to guarantee the safety of drill-well operation personnel and equipment.At present at the preventer that uses, still have some imperfection parts, as seal unreliablely, top cover is damaged easily, and the sealing position is often leaked; Top cover and housing directly connect with king-bolt, need bigger power just can unclamp or tighten these bolts when dismounting or installation, not only time-consuming but also require great effort, it is very inconvenient that top cover damages the back disassembling, assembling and replacing, when operating pressure was higher, the structure of this preventer also was difficult to satisfy load bearing requirements.

The utility model content

The purpose of this utility model provide a kind of seal reliable, can quickly dismantled, drilling well annular preventer easy to use.

Technical solution of the present utility model is to realize like this, a kind of drilling well annular preventer, constitute by housing and the piston, glue core, support tube and the dust ring that are installed in the housing, top cover is installed in the upper end of housing, by briquetting and screw they are bound up, its special character is, top cover is fixed on the housing by rest shoe, and rest shoe is installed in the groove of housing by pawl valve snail nail.

In above-mentioned technical solution, its special character is, between top cover and glue core wear strip is installed.

In above-mentioned technical solution, its special character is that also the lower end of glue core is the type conical bench shape, and the glue core is installed in support tube and piston top, and support tube is screwed on housing, has measured hole on top cover.

In above-mentioned technical solution, its special character also is, between housing and piston dust ring is installed, and sealing ring is housed respectively between top cover, dust ring and piston, between housing and the piston sealing ring is housed.

The beneficial effects of the utility model are, fix by rest shoe between (1) top cover and the housing, and cap lock is fixed on the housing, can make the rest shoe locking or throw off by chuck screw and interior bolt thereof, can realize the dismounting of top cover convenient and strength-savingly.(2) between top cover and glue core, have wear strip, can prevent that top cover from damaging, after wear strip damages, only need to change the little wear strip of volume, do not need to change the very big top cover of volume.(3) lower end of glue core is the type conical bench shape, under the promotion of piston, crimp takes place easily, and the spill-out of distortion back fluid sealant is little, and the damaged condition of glue core is just little.Can keep reliable sealing effect.(4) on top cover, have measured hole, can pass through this hole measurement position of piston easily,, further calculate the residual life of plastic emitting core perhaps from the visual observation position of piston.

Description of drawings

Accompanying drawing is the structural representation that partly cuts open of the present utility model.

The specific embodiment

Housing 9 is step-like cylinders, its lower end has flange and bolt hole, its middle part has going up of highly pressurised liquid and imports and exports 15, imports and exports 19 down, around the top of housing 9, be evenly equipped with 24 screws, in adorn 24 pawl valve snails nail 11, have one annular groove in the

housing

9,24 rest shoes 10 are housed in groove.Piston 23, support tube 25, glue core 1 and dust ring 17 are installed in the housing 9, the upper end of piston 23 has step-like inner cone,

sealing ring

20,22 is installed between piston 23 and the housing 9, support tube 25 is fixedly mounted in the housing 9 by screw 24, has the square through hole of two rows on the support tube 25.The center of glue core 1 has through hole, its lower end is step-like Outer Taper, glue core 1 is installed in the upper end of piston 23 and support tube 25, dust ring 17 be installed in top cover 4 below, be between housing 9 and the piston 23, have sealing ring 27 between top cover 4 and the piston 23, be used for sealing the pressure on top, help improving the force-bearing situation of dust ring 17, be separately installed with

sealing ring

16,18 between housing 9, piston 23 and the dust ring 17, dust ring 17 can prevent that the mud on top from entering in the plunger shaft 26.The center of top cover 4 has through hole, also has measured hole 5 on top cover 4, and its place, aperture is equipped with sealing screw, has cat's paw's groove around the side of top cover 4.Wear strip 2 is installed on the top cover 4 by screw 3, top cover 4 is installed in housing 9 upper ends, between top cover 4 and the housing 9 sealing ring 6 is housed, 24 pawl valve snail nails 11 are installed in the screw of housing 9 sides, promote rest shoe 10 by pawl valve snail nail 11, cat's paw on the rest shoe 10 is embedded in cat's paw's groove of top cover 4, top cover is locked.Pawl valve snail nail 11 is hollow screws, and bolt 14 is installed in the hole of pawl valve snail nail 11, and bolt 14 is bound up by the screw thread and the rest shoe 10 of its front end, has sealing ring 12,13 respectively on pawl valve snail nail 11 and bolt 14.Briquetting 8 is pressed in top cover 4 on the housing 9 by screw 7, is used for the auxiliary connection of top cover 4 and housing 9.

When high-pressure and hydraulic oil by under import and export 19 and enter in the housing 9, high-pressure and hydraulic oil promotes piston 23 and moves upward, glue core 1 is under the impetus of the piston 23 upper end stairstepping conical surfaces, laterally push glue core 1, glue core 1 is shunk to the center, up to drilling rod tightly being embraced (when in the preventer drilling rod being arranged) or being utilized glue core 1 directly to seal the central through hole of preventer (when in the preventer drilling rod being arranged), so just realized plugging action.When high-pressure and hydraulic oil enters in the housing 9 by last import and export 15, high-pressure and hydraulic oil promotes piston 23 and moves downward, and glue core 1 opens by the elasticity of self, and falls after rise downwards, realizes opening the process of glue core.Have measured hole 5 on top cover 4 tops, there is sealing thread in the aperture, and measurer can arrive the upper end of piston 23 by this hole, can externally measure or observe position of piston, uses easily.

Claims

1. drilling well annular preventer, by housing (9) and be installed in piston (23), glue core (1), support tube (25) and dust ring (17) formation in the housing (9), top cover (4) is installed in the upper end of housing (9), by briquetting (8) and screw (7) they are bound up, it is characterized in that, top cover (4) by and rest shoe (10) be fixed on the housing (9), rest shoe (10) is installed in the groove of housing (9) by bolt (14).

2. a kind of drilling well annular preventer according to claim 1 is characterized in that, between top cover (4) and glue core (1) wear strip (2) is installed.

3. a kind of drilling well annular preventer according to claim 1 and 2 is characterized in that,

1. glue core (1) lower end is the type conical bench shape, and glue core (1) is installed in support tube (25) and piston (23) top, and support tube (25) is fixed on the housing (9) with screw (24);

2. on top cover (4), has measured hole (5).

4. a kind of drilling well annular preventer according to claim 1 and 2, it is characterized in that, between housing (9) and piston (23), dust ring (17) is installed, sealing ring (27,18) is housed respectively between top cover (4), dust ring (17) and piston (23), between housing (9) and the piston (23) sealing ring (16) is housed.

5. a kind of drilling well annular preventer according to claim 3, it is characterized in that, between housing (9) and piston (23), dust ring (17) is installed, sealing ring (27,18) is housed respectively between top cover (4), dust ring (17) and piston (23), between housing (9) and the piston (23) sealing ring (16) is housed.