CN201212376Y

CN201212376Y - Injection well pipe column pressure release valve

Info

Publication number: CN201212376Y
Application number: CNU2008200721289U
Authority: CN
Inventors: 李颖
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-07-15
Filing date: 2008-07-15
Publication date: 2009-03-25
Anticipated expiration: 2018-07-15

Abstract

The utility model discloses a water injection well pipe column pressure release valve which is composed of a main body (1), a sliding sleeve (2) and a shear ring (3), wherein the sliding sleeve (2) is fixed on the main body (1) through the shear ring (3), the inner channel and the outer channel on the main body (1) are sealed through the sliding sleeve (2), and an annular hermetic air cavity is formed between the main body (1) and the sliding sleeve (2); after the pressure release valve is positioned into a well, the hermetic air cavity is formed between the main body (1) and the sliding sleeve (2), meanwhile, pressure difference exerting on both the upper surface and the lower surface of the sliding sleeve (2) is mainly from the inner pressure of the pipe column, when the pressure difference is greater than a designed value of the shear ring (3), the shear ring (3) is cut off, the sliding sleeve (2) descends, the inner through hole and the outer through hole designed at the side surface of the main body (1) are opened, thus the inner and the outer of the oil pipe are communicated; constant pressure of the pressure release valve is opened, sealing performance is reliable during the operation, and can not be affected by the inner pressure difference and the outer pressure difference of the pipe column, and the function of anti-plugging to foreign substances is provided.

Description

Water injection well tubing string relief valve

Technical field

The utility model relates to a kind of oil-field flooding kit, relates in particular to a kind of water injection well tubing string relief valve.

Background technology

At present, be installed in water injection well tubing string bottom, there are two deficiencies in the control valve that plays check action: the one, and ball-and-seat is missed under the influence of factors such as corrosion and scaling after the long-term work, has influenced in the water injection string injection well downhole flow regulator to the control of bottom layer position water injection rate; The 2nd, because the long-term precipitation of impurity, some valve is blocked, and during well workover, does not have the effect of pressure release, also has the problem of salvaging difficulty after the long-term work of salvagable relief valve.

Summary of the invention

The purpose of this utility model is in order to overcome the technological deficiency of existing relief valve, and provide a kind of water injection well tubing string relief valve, this water injection well tubing string relief valve is that level pressure is opened valve, ground water injection pressure and the hydrostatic sum of tubing string when the design of this valve is opened pressure and is higher than packer setting pressure and tubing string static pressure sum and normal water filling, when normal water filling, this valve is in closed condition, so does not have the leakage problem during water filling; When impurity deposited, impurity can deposit among the blind pipe of valve bottom by this valve; During well workover, ground is suppressed, and when pump truck pressure and the hydrostatic sum of tubing string were higher than this valve design pressure, relief valve was opened, the inside and outside connection of tubing string; This valve has the function that prevents that junk from stopping up on structure design, improve the safety of lift pipe string; At packer setting during,, but can form the ball-and-seat of a pressure release by the mode of pitching in the tubing string if relief valve is opened accidentally with normal water filling.

Technical solution of the present utility model is:

The utility model by main body, sliding sleeve, cut the ring forms, sliding sleeve by cut the ring be fixed on the main body, sliding sleeve seals up the inside and outside intercommunicating pore on the main body, between main body and the sliding sleeve formation one ring-like closed gas chamber.

The course of work of the present utility model and principle are:

After the utility model is gone into the well, formed the gas chamber of a sealing between main body and the sliding sleeve, the pressure differential that acts on the sliding sleeve upper and lower faces simultaneously mainly comes from the tubing string internal pressure, when pressure differential when cutting the design load of ring, cutting ring cuts off, sliding sleeve is descending, and design is opened at the inside and outside intercommunicating pore of main body side.

During normal water filling, pressure does not reach the shear strength of cutting ring, and tubing string is inside and outside not to be communicated with; During well workover, ground is suppressed, and when ground pressure and liquid column hydrostatic pressure sum are higher than the design load of cutting ring, cut ring and is cut off, and sliding sleeve is descending to drop in gas chamber, and the inside and outside intercommunicating pore on the main body is opened, and oil pipe is inside and outside to be communicated with.

The beneficial effects of the utility model are: level pressure is opened, and sealing is not reliably influenced by the inside and outside pressure differential of tubing string during work, and has the function that anti-impurity stops up.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Wherein: 1-main body, 2-sliding sleeve, 3-cut ring.

The specific embodiment

Below in conjunction with accompanying drawing the utility model is further described:

As shown in Figure 1, present embodiment by main body 1, sliding sleeve 2, cut ring and 3 form, sliding sleeve 2 is fixed on the main body 1 by cutting ring 3, sliding sleeve 2 seals up the inside and outside intercommunicating pore on the main body 1, formation one ring-like closed gas chamber between main body 1 and the sliding sleeve 2.

Described to cut ring 3 can be to cut ring or shear pin or blind rivet, or the part protruded of sliding sleeve 2 edges; The top of described main body 1 has tapered ball seat.

The course of work and the principle of present embodiment are:

During normal water filling, pressure does not reach the shear strength of cutting ring 3, and tubing string is inside and outside not to be communicated with; During well workover, ground is suppressed, and when ground pressure and liquid column hydrostatic pressure sum are higher than the design load of cutting ring 3, cut ring 3 and cut off, sliding sleeve 2 descending dropping in gas chamber, the inside and outside intercommunicating pore on the main body 1 is opened, the inside and outside connection of oil pipe.

During normal water filling, pressure does not reach the shear strength of cutting ring 3, and tubing string is inside and outside not to be communicated with; During well workover, ground is suppressed, and when ground pressure and liquid column hydrostatic pressure sum are higher than the design load of cutting ring 3, cut ring 3 and cut off, sliding sleeve 2 descending dropping in gas chamber, the inside and outside intercommunicating pore on the main body 1 is opened, and oil pipe is inside and outside to be communicated with.

Claims

1, a kind of water injection well tubing string relief valve, it is characterized in that: by main body (1), sliding sleeve (2), cut ring (3) and form, sliding sleeve (2) is fixed on the main body (1) by cutting ring (3), sliding sleeve (2) seals up the inside and outside intercommunicating pore on the main body (1), forms a ring-like closed gas chamber between main body (1) and the sliding sleeve (2).

2, a kind of water injection well tubing string relief valve according to claim 1 is characterized in that: the described ring (3) of cutting is shear pin or blind rivet, or the part of sliding sleeve (2) edge protrusion.

3, a kind of water injection well tubing string relief valve according to claim 1 is characterized in that; The top of described main body (1) has tapered ball seat.