CN201218077Y - Air bag type self-sealing well sealer - Google Patents

Abstract

An air bag type self-sealing blowout preventer is applied to wellhead self-sealing blowout prevention in the process of low-pressure oil well workover. Consists of a shell, an upper press ring, an air bag rubber core, an air tap and a lower press ring. Flanges are fixed on the upper part and the lower part of the cylindrical shell of the blowout preventer. The air bag rubber core is arranged in the shell, the upper end and the lower end of the air bag rubber core are provided with annular upper pressing rings, and the outer wall of the air bag rubber core is fixedly provided with a tubular air nozzle which penetrates through a hole in the wall of the shell. The inner end of the air tap is communicated with the inner space of the air bag rubber core. The effect is as follows: the air tap is connected with an air passage of the operation machine, and the air inflation and deflation of the air bag rubber core control the sealing and the separation of the air bag rubber core and the oil pipe, so that the fast control of wellhead fluid is realized; under the condition that no fluid exists at the wellhead, the air bag rubber core is in a loose state through air discharge, so that the abrasion between the air bag rubber core and an oil pipe is reduced, and the service life of the tool is prolonged. Realizes quick blowout prevention and quick separation, and has the characteristics of safety, reliability, simple and convenient operation, small volume, light weight and the like.

Description

Airbag self-sealing well sealing device

technical field

The tool of the utility model belongs to a workover wellhead self-sealing blowout prevention device in the field of petroleum development, and is suitable for wellhead self-sealing blowout prevention operation of wellhead blowout prevention and overflow control during a low-pressure workover operation with wellhead pressure below 0.8 MPa.

technical background

At present, in the process of oilfield workover operations, in order to prevent the fluid in the well from overflowing suddenly and causing environmental pollution, the wellhead must always be equipped with a well sealing device, and the self-sealing well sealing device is often used on site. Self-sealing sealers have a fixed rubber core. When the self-sealing sealer is in working state, the rubber core seals the annulus of the oil casing, so that the fluid flowing out of the well can be discharged in a directional manner. However, under most working conditions, no fluid flows out of the well. At this time, the rubber core and the tubing are still in a sealed state, which greatly increases the friction between the rubber core and the tubing; the tubing moves up or down very fast, causing The wear of the rubber core will shorten the service life of the rubber core. Often a well will be worn out and a rubber core will be scrapped, which will increase the operating cost.

Contents of the invention

The purpose of the utility model is to provide an airbag type self-sealing well-sealing device, which can realize self-sealing wellhead, can effectively seal and directional discharge the wellhead liquid flow, and can realize rapid and effective sealing and separation during operation, which improves the work efficiency. Efficiency and construction safety, while reducing the wear of oil pipes and rubber cores in non-working conditions, prolonging the service life of tools.

The technical scheme of the utility model is: an airbag type self-sealing well sealing device, which is mainly composed of a shell, an upper pressure ring, an airbag rubber core, an air nozzle and a lower pressure ring. An upper connecting flange is fixed on the upper part of the capping device cylindrical shell, and a lower connecting flange is fixed on the lower part of the capping device shell. There is a ring-shaped airbag core in the housing, and the feature is that there is an annular upper pressure ring between the upper end of the airbag core and the upper connecting flange, and an annular lower pressure ring between the lower end of the airbag core and the lower connecting flange. A tubular gas nozzle is fixed on the outer wall of the airbag core, and the gas nozzle passes through the hole on the housing wall. The inner end of the air nozzle communicates with the inner space of the airbag core, and the other end of the air nozzle can be connected to the gas source of the workover rig through a hose. During work, the compressed gas source is provided by the workover rig. The air source of the workover rig is that when the airbag core is inflated, the airbag core expands to seal the outer wall of the tubing; when the airbag core is exhausted, the airbag core shrinks, and the airbag core is separated from the tubing to reduce the friction between the tubing and the airbag core.

The screw thread is used between the cylindrical shell of the well capping device and the upper connecting flange and the lower connecting flange.

A vulcanization method is used between the outer wall of the airbag rubber core and the air nozzle to fix the air nozzle on the outer wall of the airbag rubber core.

Beneficial effects of the utility model: the utility model airbag type self-sealing well sealing device has an inflatable airbag core with an air nozzle in the casing, and the air nozzle is connected with the air path of the operating machine, and the airbag is controlled by the inflation and deflation of the airbag core The sealing and detachment of the rubber core and the tubing realizes rapid control of the fluid at the wellhead; at the same time, when there is no fluid at the wellhead, by deflation, the airbag core is in a loose state and does not come into contact with the tubing, reducing the pressure of the airbag core. Wear between tubing and tubing prolongs tool life.

The device adopts a retractable air bag to realize the sealing control of the tubing and casing annulus, and has the function of fast sealing and separation. Compared with traditional well control equipment, it has the following advantages:

(1) It has the advantages of simple structure, small size and light weight, which can effectively reduce the labor intensity on site and improve work efficiency.

(2) Reliable work and outstanding anti-blowout performance. The device fully realizes the performance characteristics of the self-sealing sealer, and the contraction of the air bag can complete the sealing of the tubing and the sealer annulus in an instant, realizing fast and effective blowout prevention control.

(3) The device uses the gas source of the workover rig as its power source, and does not need an independent gas source, so it is very convenient to use on site.

Description of drawings

Fig. 1 is a schematic diagram of the cross-sectional structure of the airbag type self-sealing well-sealing device.

In the figure: 1-upper connection flange, 2-shell, 3-upper pressure ring; 4-airbag rubber core; 5-air nozzle, 6-lower pressure ring, 7-lower connection flange.

Detailed ways

Below in conjunction with embodiment accompanying drawing, the utility model is described further.

Embodiment 1: Refer to Fig. 1. The airbag type self-sealing well sealing device is composed of a shell 2, an upper pressure ring 3, an airbag core 4, an air nozzle 5 and a lower pressure ring 6. An upper connecting flange 1 is fixed on the upper part of the capping device cylindrical shell 2, and a lower connecting flange 7 is fixed on the lower part of the capping device casing 2. The screw thread used between the capping device cylindrical shell 2 and the upper connecting flange 1 and the lower connecting flange 7 is fixed. Inside the housing 2 there is an annular airbag insert 4 .

There is an annular upper pressure ring 3 between the upper end of the airbag core 4 and the upper connecting flange 1 , and an annular lower pressure ring 6 between the lower end of the airbag core 4 and the lower connecting flange 7 . The contact surfaces of the upper pressure ring 3, the lower pressure ring and the airbag core 4 are arc-shaped. The central hole of the annular upper pressure ring 3 and the annular lower pressure ring 6 can pass through the oil pipe. A tubular gas nozzle 5 is fixed on the outer wall of the middle part of the airbag rubber core 4, and a vulcanization method is adopted between the airbag rubber core 4 outer wall and the gas nozzle 5 so that the gas nozzle 5 is fixed on the airbag rubber core 4 outer wall. Gas nozzle 5 passes through the aperture on housing 2 walls. The inner end of the gas nozzle 5 communicates with the inner space of the airbag core 4, and the other end of the gas nozzle 5 can be connected with the gas source of the workover rig through a hose.

Its working principle: the device is installed at the wellhead when the tubing is being lifted and lowered during well workover operations. When liquid flow occurs at the wellhead, the gas source switch is turned on, and the airbag core 4 is filled with compressed gas. The annulus of the pipe is sealed, which acts as a self-sealing well sealing device. The sealing degree can be adjusted with the pressure of the gas source, so that continuous operation can be realized, and the directional control of the wellhead fluid can be realized to prevent the liquid in the well from ejecting out of the ground and prevent the ground from being small. When there is no liquid flow in the wellhead, the gas source is disconnected, the airbag core 4 shrinks, and the airbag core 4 is separated from the oil pipe, which avoids the inner wall of the airbag core 4 and the oil pipe during the lifting operation. Wear and prolong tool life.

Claims (4)

1. An airbag type self-sealing sealing device, mainly composed of a casing (2), an upper pressure ring (3), an airbag core (4), an air nozzle (5) and a lower pressure ring (6). An upper connecting flange (1) is fixed on the upper part of the cylindrical casing (2) of the well capping device, and a lower connecting flange (7) is fixed on the lower part of the capping device casing (2). The core (4) is characterized in that there is an annular upper pressure ring (3) between the upper end of the airbag core (4) and the upper connecting flange (1), and an annular upper pressure ring (3) between the lower end of the airbag core (4) and the lower connecting flange ( 7) There is an annular lower pressure ring (6) between them, and a tubular air nozzle (5) is fixed on the outer wall of the airbag core (4), and the air nozzle (5) passes through the hole on the wall of the housing (2) , the inner end of the air nozzle (5) communicates with the inner space of the airbag core (4). 2. The air bag type self-sealing sealer according to claim 1, characterized in that: the cylindrical casing (2) of the sealer and the upper connecting flange (1) and the lower connecting flange (7) The thread used between them is fixed. 3. The airbag type self-sealing well sealing device according to claim 1, characterized in that: between the outer wall of the airbag core (4) and the gas nozzle (5), the gas nozzle (5) is fixed on the airbag core ( 4) On the outer wall. 4. The airbag type self-sealing sealer according to claim 1, 2 or 3, characterized in that: the contact surfaces between the upper pressure ring (3) and the lower pressure ring (6) and the airbag core (4) are curved surfaces type.

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