CN201810272U - Ultra-high pressure normally open valve for acidizing liquid discharge - Google Patents

Abstract

The ultra-high pressure normally open valve for acidizing and draining is used in formation acidizing and draining construction of high-pressure gas fields. The lower end of the valve body is connected with a lower joint, and there is a hollow cylindrical sealing sleeve in the center hole of the valve body, and there is a horizontal communication hole between the sealing sleeve and the valve body; there is an annular sealing ring between the sealing sleeve and the valve body ; The shear pin fixes the sealing sliding sleeve on the upper end of the lower joint; the upper end of the lower joint has a central hole. The effect is: the passage of the acidizing string can be normally opened, and when it needs to be closed, the bypass hole of the tubing and casing can be closed when the steel ball is put into the acidizing and draining. At the same time, a one-way sealing valve is formed to ensure that the fluid flows out from the valve body.

Description

Ultra-high pressure normally open valve for acidizing liquid discharge

technical field

The utility model relates to the technical field of oil field high-pressure gas field exploitation, in particular to oil well stratum acidification and liquid drainage construction, which is an ultra-high pressure normally open valve connected to an acidizing pipe string to provide channels for acidification and liquid drainage.

Background technique

In recent years, a number of high-pressure oil and gas wells in an oilfield have leaked completion strings and abnormally increased casing pressure, which has caused huge economic losses and hidden serious accident hazards.

In the Tongnanba Oilfield, the formation pressure coefficient of Well Heba 1 was as high as 2.28, and the well depth was 6130m. During the test in August 2006, the shut-in oil pressure reached 94.2MPa, which brought many technical difficulties to the completion test, mainly including: 1. High pressure makes it difficult to select wellhead and downhole tools; 2. Serious erosion of surface processes; 3. Contains corrosive media; 4. Difficult design of reservoir casing; 5. Difficulty in shutting down the well. Therefore, the conventional normally open valve cannot meet the above requirements, and this tool was developed in order to avoid serious accident hazards.

Utility model content

The purpose of this utility model is to provide an ultra-high pressure normally open valve for acidizing and draining, which can make the passage of the acidizing string normally open, and when it needs to be closed, it can realize the oil casing bypass hole during acidizing and draining closure. At the same time, a one-way sealing valve is formed to ensure that the fluid flows out from the lower part of the valve body.

The technical scheme adopted in the utility model is: an ultra-high pressure normally open valve for acidizing liquid drainage, mainly composed of a steel ball, a sealing ring, a sealing sliding sleeve, a valve body, a lower joint and a shear pin. The valve body is cylindrical and has a center There are internal threads on the upper end of the valve body, internal threads on the lower end of the valve body, and a lower joint connected to the lower end of the valve body. It is characterized in that: there is a hollow cylindrical sealing sliding sleeve in the center hole of the valve body. There are transverse communication holes on the sliding sleeve and the wall of the valve body. There is an annular sealing ring between the sealing sliding sleeve and the valve body, and the sealing ring is on both sides of the transverse communication hole; there is a shear pin at the lower end of the sealing sliding sleeve, and the shearing pin fixes the sealing sliding sleeve on the upper end of the lower joint; the lower joint There is a center hole at the upper end. After the shearing pin is cut off, the sealing sliding sleeve can slide down into the center hole at the upper end of the lower joint. When the sealing sliding sleeve slides downward, the transverse communication hole is closed.

In order to prevent the shearing pins from coming out automatically, there are screw holes on the lower end surface and the vertical end surface of the sealing sliding sleeve, and there are anti-loosening pins in the screw holes, and the ends of the anti-loosening pins compress the shearing pins.

The sealing ring is a composite sealing ring.

Briefly describe the working principle of the ultra-high pressure normally open valve for acidizing liquid discharge. See Figure 1. Normally, the horizontal connection hole is normally open. When it needs to be closed, throw the steel ball 1 from the oil pipe. After the steel ball 1 settles for 30-50 minutes, press it from the oil pipe. When the pressure rises, the shear pin 6 and the sliding sleeve 3 are cut off. Move down to realize the closure of the oil casing bypass hole (transverse communication hole) when acidizing and draining. At the same time, a one-way sealing valve is formed to ensure that the fluid flows out from the lower part of the steel ball 1 . The sliding sleeve is used to close the valve body under the action of the ball, and the working pressure is 140MPa, which can realize the closure of the oil casing bypass hole during acidification and liquid discharge.

Beneficial effects of the utility model: The ultra-high pressure normally open valve for acidizing and draining of the utility model can make the passage of the acidizing string normally open, and when it needs to be closed, the steel ball can be put into the oil casing when acidizing and draining The bypass hole is closed. At the same time, a one-way sealing valve is formed to ensure that the fluid flows out from the lower part of the steel ball. The tool has the characteristics of simple structure, easy disassembly and assembly.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the structure of an ultra-high pressure normally open valve for acidification drainage of the present invention.

In the figure, 1. Steel ball, 2. Sealing ring, 3. Sealing sliding sleeve, 4. Valve body, 5. Lower joint, 6. Shearing pin, 7. Locking pin.

Detailed ways

Embodiment 1: Taking an ultra-high pressure normally open valve for acidification drainage as an example, the utility model is further described in detail.

See Figure 1. The utility model is an ultra-high pressure normally open valve for acidizing liquid discharge, which is mainly composed of a steel ball 1, a sealing ring 2, a sealing sliding sleeve 3, a valve body 4, a lower joint 5 and a shear pin 6. Valve body 4 is cylindrical shape, external diameter 140mm, has center hole, has internal thread at the upper end of valve body 4, has internal thread at the lower end of valve body 4, is connected with a lower joint 5 at the lower end of valve body 4. There is a hollow cylindrical sealing sliding sleeve 3 in the center hole of the valve body 4, and there are four transverse communication holes on the sealing sliding sleeve 3 and the wall of the valve body 4. There are two annular sealing rings 2 between the sealing sliding sleeve 3 and the valve body 4, and the sealing rings 2 are on both sides of the transverse communication hole; the sealing rings 2 are combined sealing rings. There are four shearing pins 6 at the lower end of the sealing sliding sleeve 3 , and the shearing pins 6 fix the sealing sliding sleeve 3 on the upper end of the lower joint 5 . The upper end of the lower joint 5 has a central hole. The diameter of the central hole at the upper end of the lower joint 5 is the same as the outer diameter of the sealing sliding sleeve 3 .

There are four screw holes on the lower end surface of the sealing sliding sleeve 3 and the vertical end surface, and a locking pin 7 is respectively fixed in the screw holes, and the ends of the locking pin 7 compress the shearing pin 6 .

Claims (3)

1. acidifying discharge opeing super-pressure normally open valve, mainly form by steel ball (1), sealing ring (2), sealing sliding sleeve (3), valve body (4), lower contact (5) and shear pin (6), valve body (4) has centre bore for the cylinder bodily form, there is internal thread upper end at valve body (4), there is internal thread lower end at valve body (4), be connected with lower contact (5) in the lower end of valve body (4), it is characterized in that: in valve body (4) centre bore, a hollow cylinder bodily form sealed sliding cover (3) is arranged, on sealing sliding sleeve (3) and valve body (4) wall horizontal linked hole is arranged; Between sealing sliding sleeve (3) and valve body (4) O-ring seal (2) is arranged, sealing ring (2) is in the both sides of horizontal linked hole; There is shear pin (6) lower end at sealing sliding sleeve (3), and shear pin (6) will seal the upper end that sliding sleeve (3) is fixed on lower contact (5); There is centre bore the upper end of lower contact (5).

2. acidifying discharge opeing super-pressure normally open valve according to claim 1 is characterized in that: lower surface and perpendicular end surface at sealing sliding sleeve (3) have screw hole, and check pin (7) is arranged in the screw hole, and the end of check pin (7) compresses shear pin (6).

3. acidifying discharge opeing super-pressure normally open valve according to claim 1 and 2 is characterized in that: described sealing ring (2) is a combined seal ring.

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