CN2055859U

CN2055859U - High pressure self-seal well sealing device

Info

Publication number: CN2055859U
Application number: CN 89203505
Authority: CN
Inventors: 王允忠; 冯永泉; 蒋宝云
Original assignee: OIL MINED TECHNOLOGY RESEARCH INST SHENGLI OIL FIELD
Current assignee: OIL MINED TECHNOLOGY RESEARCH INST SHENGLI OIL FIELD
Priority date: 1989-03-23
Filing date: 1989-03-23
Publication date: 1990-04-11

Abstract

The utility model relates to a high-pressure self seal well sealing device for an oil well operational wellhead in oil exploitations; the utility model is composed of an upper cover, a pressure ring, a self seal rubber core, and a flange shell body. The utility model is characterized in that a special shape steel frame which is arranged in the self seal rubber core is adopted to improve the intensity and lengthen working life of the self seal rubber core; one conical surface is arranged on both top sides of the flange body and the self seal rubber core; the self seal rubber core is fixed in the inner cavity of the flange shell body depended on the conical surface cooperated with each other; the area between the well casing and the upper cover is sealed by the conical surface. The utility model has the advantages of small volume, and light weight; besides, the utility model can be used on the wells of 5.5-7 size pipe columns under a 10Mpa pressure; not being damaged through a 15000m pipe column.

Description

High pressure self-seal well sealing device

The utility model relates to the well head blowout control equipment of oil-water well operation in a kind of oil exploitation, and it is made up of loam cake, pressure ring, self-sealing rubber core and flange shell.Rigid backbone is arranged in the self-sealing rubber core, and a conical surface that matches with the conical surface on flange shell top is arranged at its top, leans on this conical surface seal between loam cake and the flange shell, even pit shaft and atmospheric sealing.Flange shell adopts the double end trapezoidal thread with being connected of loam cake, has improved connection reliability, has reduced labor intensity of operating personnel.

In " oil field equipment " in September, 1985 number, the 14th volume discloses a kind of self-sealing blowout preventer on the 5th phase, its objective is to prevent blowout, safety operation when shaft mouth operation.Structure is to be connected by housing, rubber self-sealing core and loam cake to form, and self-sealing rubber core is connected with loam cake by bolt.Weak point is, its adopts bolt to connect self-styled rubber wick and loam cake, because rubber wick bears alternating stresses in the process up and down at tubing string, all is added on the bolt, easily produces fatigue damage, and application life is short; Housing and loam cake are by the sealing of " O " type circle, very easily damage or the like.Just lost efficacy by the whole self-sealing core of 2500m tubing string.

The purpose of this utility model provides a kind of high pressure self-sealing blowout preventer that can overcome above-mentioned shortcoming.

The purpose of this utility model also can reach by following measure: it constitutes a high pressure self-sealing blowout preventer by loam cake, flange shell, pressure ring and self-sealing rubber core.A conical surface is all arranged at self-sealing rubber core and flange shell top, and these two conical surfaces are worked in coordination, and the conical surface seat of self-sealing rubber core is on the conical surface of flange shell, so that self-sealing rubber core is among the inner chamber of flange shell; Rely on the conical surface of flange shell and mutually combining of self-sealing rubber core, make between pit shaft and the loam cake to reach sealing.

There is garden week be the rigid backbone of some fin shapes to be furnished with hole, some gardens on its skeleton wall in the self-sealing rubber core,, increases substantially application life so that glue combines better with skeleton, and makes self-sealing rubber core axially with directly upwards favorable rigidity being arranged all.

A pressure ring seat is in the self-sealing rubber core top, and it has the rigid annular body of margo for inside and outside Kong Jun, and is fixing and compress self-sealing rubber core, makes self-sealing rubber core be in the position and the state of favourable sealing all the time.

When tubing string when the self-sealing rubber core center is passed, the pressure energy of pit shaft act on self-sealing rubber core around, make its shrinkage strain, hold tubing string tightly, realize movable sealing; The conical surface on flange shell and self-sealing rubber core top under the loam cake effect, abuts against each other, and makes between pit shaft and the loam cake to reach static seal.When the pit shaft pressure energy hour, pre-sealed effect is played in the self-sealing rubber core bottom, can make again in the R chamber of self-sealing rubber core and leave fluid, tubing string is played set upright and the lubrication that reduces pressure (as Fig. 1).

Flange shell has adopted the double end trapezoidal thread with being connected of loam cake, both can improve the security reliability of equipment, has alleviated labor intensity of operating personnel again.

The purpose of this utility model can also reach by following measure:

Rigid backbone in the self-sealing rubber core also can be made up of the some flap valves that have ribs and through hole.The through hole that passes on the flap valve is encircled in an opening garden, and flap valve is hung on the fixing annular support frame, and flap valve is formed a garden tubular non-yielding prop inwardly with ribs; Flap valve outwards rotates, and is expansible.Form hole, the garden latus rectum that becomes big.

The appearance and size of self-sealing rubber core is to structure of the present utility model and result of use with have a significant impact application life.The profile physical dimension that the utility model adopts is φ 180-φ 250mm, is preferably φ 200-φ 230mm.

The height of the rigid backbone in the self-sealing rubber core is to having quite big influence application life of the present utility model, and the height that is adopted is 90-130mm.

The drawing of accompanying drawing is described as follows:

Fig. 1 is that figure is partly cutd open in general assembly of the present utility model;

Fig. 2 is that the utility model self-sealing rubber core is faced and partly cutd open figure;

Fig. 3 is that the utility model flange shell is faced and partly cutd open figure;

Fig. 4 is that the utility model pressure ring is faced and partly cutd open figure;

Fig. 5 is that the utility model self-sealing rubber core rigid backbone is faced and partly cutd open figure;

Fig. 6 is that the utility model loam cake is faced and vertical view;

Fig. 7 is that another shape of the utility model self-sealing rubber core rigid backbone is partly cutd open figure;

Fig. 8 is facing and lateral view of another shaped member flap valve of the utility model self-sealing rubber core rigid backbone;

Fig. 9, be Fig. 7 along A-A to sectional view.

The utility model provides embodiment below in conjunction with accompanying drawing, is described in further detail:

As Fig. 1, the utility model is in the inner chamber of flange shell self-sealing rubber core by 3 of the conical surfaces of self-sealing rubber core 5 on the conical surface 11 of

flange shell

9,10, and the working in coordination of the

conical surface

3,11 makes flange shell inner chamber-be to reach sealing between pit shaft and the loam cake 1.Open flow joint 6 and plug 7 are connected the flange shell middle part, are connected with pit shaft, and the pit shaft internal pressure is discharged, and also can pressurize in pit shaft when needed.Pressure ring 2 is sitting in the top of self-sealing rubber core 5, and is fixing and compress self-sealing rubber core, makes it be in good sealing state all the time.Screw thread on the loam cake 1 is the double end trapezoidal internal thread, is connected with the external screw thread of flange shell, and loam cake is pressed on the pressure ring.When the pit shaft pressure energy hour, pre-sealed effect is played at 8 places, self-sealing rubber core bottom, tubing string is risen set upright the decompression lubrication.

As Fig. 7, another scheme of self-sealing rubber core rigid backbone is a movable skeleton, and it is made up of the some flap valves 13 that have ribs 12 and through hole 16; Opening garden ring 14 through holes 16 that pass on the flap valve 13 hang over flap valve on the fixing annular support frame 15; Flap valve is formed a garden tubular movable skeleton inwardly with ribs; Flap valve outwards rotates then expansible, forms hole, the garden latus rectum that becomes big.

The utility model has the advantages that withstand voltage height-in the situation of 10Mpa, work; The scope of application is wide-and can be general on the well head of 5 " 7 "; Life-span grow-can not damage by the 15000m tubing string; In light weight-gross weight only has 92Kg; Adopt the double end trapezoidal thread safe and reliable, labour intensity is little; Sealing between pit shaft and atmosphere is adopted the conical surface of self-sealing rubber core and flange shell to cooperatively interact and reached, and is reliability and durability; Adopt pressure ring to fix and compress self-sealing rubber core, the position and the state that self-sealing rubber core are in all the time be conducive to seal.

Claims

1, a kind of high pressure self-sealing blowout preventer, by loam cake, flange shell and self-sealing rubber core are formed, it is characterized in that a conical surface is all arranged at self-sealing rubber core and flange shell top, the conical surface seat of self-sealing rubber core is on the conical surface of flange shell, a pressure ring seat has a garden week to be the rigid backbone of some fin shapes in the top of self-sealing rubber core in the self-sealing rubber core.

2, high pressure self-sealing blowout preventer according to claim 1, the conical surface that it is characterized in that said self-sealing rubber core at an upper portion thereof, match with the conical surface on flange shell top, self-sealing rubber core is occupy among the inner chamber of flange shell, and make between flange shell and the loam cake and reach sealing.

3, high pressure self-sealing blowout preventer according to claim 1 is characterized in that having in the self-sealing rubber core rigid backbone, on the outer wall some radially fins is arranged around the said rigid backbone.

4, according to claim 1 or 3 described high pressure self-sealing blowout preventers, it is characterized in that rigid backbone is arranged in the self-sealing rubber core, be furnished with hole, some gardens on the garden perisporium of said rigid backbone, a pressure ring seat is in the top of self-sealing rubber core, said pressure ring is the rigid annular body that an inside and outside Kong Jun has margo, fixes and compress self-sealing rubber core.

5, high pressure self-sealing blowout preventer according to claim 1 is characterized in that a conical surface is arranged at the top of self-sealing rubber core, in the said self-sealing rubber core rigid backbone is arranged, and said rigid backbone is made up of the some flap valves that have ribs and through hole.

6, high pressure self-sealing blowout preventer according to claim 1 or 5, it is characterized in that rigid backbone is arranged in the self-sealing rubber core, said rigid backbone is encircled the through hole that passes on the flap valve by an opening garden, flap valve is hung on the fixing annular support frame, flap valve is formed a garden tubular non-yielding prop inwardly and with supporting rib, and flap valve outwards rotates, expansible, form hole, the garden latus rectum that becomes big.

7, high pressure self-sealing blowout preventer according to claim 1 and 2 is characterized in that a conical surface is arranged at said flange shell top, and said loam cake adopts the double end trapezoidal thread with connecting of flange shell.