RU2616145C1 - Self-aligning valve of bottom hole pump - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: self-aligning valve of bottom hole pump comprises a housing, a centralizer with throughway openings, a sloping shoot with flushing ports, a saddle and a sphere. The sloping shoot made lightweight is eccentrically fixed to one end of the self-aligning valve central axis. A massive cargo strapped by nut and fixed by locknut is mounted at the other end in a plane of the sloping shoot eccentricity. The inner surface of the sloping shoot is made concave with curvature radius more than sphere radius by optimal gap value between the saddle and the sphere in the open valve state. The concave surface of the sloping shoot is made in the form of a valve with longitudinal runners and flushing channels between them.

EFFECT: improved reliability of valve operation in horizontal wells.

2 dwg

Description

The present invention relates to techniques for oilfield equipment and can be used in sucker rod pumps operating in deviated and horizontal wells.

Known self-adjusting valve of the sucker rod pump, selected as an analogue, designed to work in directional wells, including a valve body installed at a predetermined in accordance with the inclination of the well angle to the submersible pump, made in a diameter larger than the diameter of the submersible pump, and mounted eccentrically relative to the pump, the valve is equipped with a control mechanism made in the form of a load located on the valve cage and articulated with a central shaft, hinged about connected to the stem of the hydraulic shock absorber associated with the sliding support (patent No. 2241853, publ. 10.12.2004).

A disadvantage of the known valve is that it works only in directional wells and requires individual production for each well with a given angle of inclination, and it is also not suitable for horizontal wells. In addition, the diameter of the valve is larger than the diameter of the pump, which makes it difficult to place it in the well, and sometimes makes it impossible. Moreover, the valve design is complicated by the bulky mechanism of its control.

A well-known self-adjusting valve of a submersible pump, selected as a prototype, including a housing, a seat, a cone sub, a working ball and a second ball, used as a load in contact with the worker, a centralizer with passage holes and a central axis on which a massive inclined tray is eccentrically fixed cargo with inclined and horizontal working parts (patent No. 2382904, publ. 02.27.2010).

A disadvantage of the known valve is that for holding two balls requires the installation of an additional conical sub. The cantilever installation on the central axis (bolt) of the rotating massive cargo tray leads to premature wear of the bolt and its backlash. The use of a bolt as an axis eliminates the possibility of fine adjustment of the gap between the working ball and the seat. The use of a smooth bed of an inclined tray, and especially its horizontal part, does not ensure complete cleaning of the surfaces of the balls from sticking to them of bituminous-sandy sediments (deposits) that impede normal operation of the valve, i.e. securely closing the holes in the saddle.

The problem solved by the invention is to ensure complete cleaning of the ball from bitumen-sand deposits, accurate control of the gap between the ball and the seat, increasing the reliability of the valve in horizontal wells.

The indicated technical result is achieved by the fact that at one end of the central axis of the self-aligning valve an inclined tray is eccentrically fixed, made lightweight, and at the other end in the eccentricity plane of the inclined tray, a massive load is installed, tightened with a nut and fixed with a lock nut, the inner surface of the inclined tray is concave with a radius of curvature more than the radius of the ball by the value of the optimal clearance between the seat and the ball in the open state of the valve, and the concave surface is inclined the first tray is formed as a box with longitudinal runners and flushing channels therebetween.

Ensuring the complete cleaning of the ball from bituminous-sandy deposits is carried out by performing the surface of the bed concave with longitudinal runners having a small contact surface and flushing channels between them.

Ensuring accurate control of the gap between the ball and the seat is achieved by making the inner surface of the inclined tray concave with a radius of curvature greater than the radius of the ball by the amount of the optimal clearance between the seat and the ball in the open state of the valve.

Improving the reliability of the valve in horizontal downhole is ensured by making the inclined tray lightweight.

In FIG. 1 is a frontal section through a self-aligning sucker rod pump valve. In FIG. 2 shows a horizontal section AA of the inclined tray of the self-aligning valve of the sucker rod pump.

The self-aligning valve (Fig. 1) consists of a housing 1 articulated with a centralizer 2 having through holes 3. At one end of the central axis of the self-aligning valve, an inclined tray 4 is eccentrically fixed, made lightweight and having a concave inner surface 5, on which the ball 6 rolls under action of own weight. The gap 7 between the ball 6 and the inclined tray 4 provides optimal movement of the ball 6 from the seat 8 and back when operating the sucker rod pump (not shown in the figure). The seat 8 is held in the socket (not shown) of the housing 1 by the holder 9 of the seat 8. To accurately adjust the gap 7 by moving the central axis of the self-aligning valve, an adjusting nut 10 is used, which is screwed onto the threaded protrusion of the centralizer 2 and fixed by a lock nut 11. On the central axis of the self-aligning of the valve in the eccentricity plane of the inclined tray 4, a massive load 12 is mounted, tightened by a nut 13 and fixed by a lock nut 14. Joining of a self-adjusting valve with a rod depth the second pump (not shown in the figure) is carried out using an adapter 15. In the bed 16 (Fig. 2) of the inclined tray 4, longitudinal runners 17 protrude, between which there are washing channels 18. The ball 6 is located in the bed 16 between the supporting platforms 19 and the longitudinal runners 17.

Self-adjusting valve operates as follows.

With the vertical position of the self-adjusting valve, its operation does not differ from classical valve devices.

After lowering the self-aligning valve into a horizontal well (not shown in the figure), a massive load 12, under the action of gravity, turns the inclined tray 4 into a horizontal position. In this case, the ball 6 rolls along the concave inner surface 5, sits in the seat 8 and, using the back pressure of the sucker rod pump, tightly closes the suction hole (not shown in the figure) of the seat 8. During the movement of the plunger (not shown in the figure) the sucker rod pump to the right presses on the ball 6, which, moving along the concave inner surface 5 of the inclined tray 4, opens the suction hole of the saddle 8 and closes the gap 7 between the ball 6 and the inclined tray 4. In this case, the ball 6 slides along the longitudinal runners 17, and having a small contact surface and washing channels 18, which contributes to the forcing of any bituminous-sandy deposits and self-cleaning from them during repeated, chaotic rotation and passage of the ball 6 along the longitudinal runners 17. The washing channels 18 serve to free the bed 16 of the inclined tray 4 from accumulated particles bitumen and fine sand.

The claimed invention allows for the complete cleansing of the ball from bituminous-sandy deposits, precisely regulate the gap between the ball and the seat, and increase the reliability of the valve in horizontal wells.

Claims (1)

A self-adjusting valve of a sucker-rod suction pump, comprising a housing, a centralizer with passage holes, an inclined tray with flushing channels, a seat, a ball, characterized in that an inclined tray is eccentrically fixed at one end of the central axis of the self-adjusting valve, made lightweight, and at the other end in an eccentricity plane the inclined tray has a massive load tightened with a nut and fixed with a lock nut, the inner surface of the inclined tray is made concave with a radius of curvature of Chez ball radius on optimal value of the gap between the seat and ball valve in an open condition, wherein the concave surface of the inclined chute is designed as a box with longitudinal runners and flushing channels therebetween.

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