RU2098665C1 - Oil-well pumping unit - Google Patents

Abstract

FIELD: oil recovery technique; shutting-off well for conducting repair jobs. SUBSTANCE: oil-well pump is provided with cylinder, plunger, suction and delivery valves and subsurface safety valve secured in oil well tubing. Subsurface safety valve is made in form of ball valve whose ball 1 is engageable with spring-loaded rod held by ball. Cylinder of oil-well pump is provided with end-piece which is passed through hole of valve seat and is engageable with ball. EFFECT: reliability. 3 dwg

Description

 The invention relates to techniques for oil production, in particular to downhole pumping units, and is intended for blocking a well during repair work in the oil industry.

 Known devices that prevent oil from escaping to the surface of wells with semi-ghost manifestations during repair work when it is necessary to remove the sucker rod pump from the well. In particular, a device is known in which, when a plug-in pump breaks down, the shutter is carried along with the plunger, sits on the conical seat of the lower stage of the nipple and, under the influence of reservoir pressure, is held in it, blocking the well [1] The considered design is rather complicated and ineffective.

 A known installation of an insertable deep-well pump, in which the column of pumping pipes is equipped with a flapper-type valve at the bottom, which closes by means of a spring when the working plunger pair breaks off the lock support [2]. Such valves are less reliable than ball valves.

 Also known is a downhole pumping unit, adopted as a prototype, comprising a downhole cutter with a chamber and valve and a sucker rod pump. A downhole cutter chamber is installed under the suction valve, in the lower part of the cylinder there is an axially located pocket, and in the plunger there is a radial channel from the side of the pocket for the latter to communicate with the internal cavity of the plunger. The plunger has a pusher for interacting with the shut-off element of the suction valve, and the bottom-hole shut-off valve is double-acting [3] Despite the shut-off element being a double-acting ball valve, the ball is moved from the lower to the upper position by supplying liquid to the tubing, which complicates the design of the installation and reduces reliability.

 The present invention solves the problem of shutting off the well during repair work without significantly complicating the design of the well installation and reducing the reliability of its operation.

 This is achieved by the fact that in a well-known downhole pump installation comprising a sucker rod pump with a cylinder and a hollow plunger equipped with suction and discharge valves, and a bottomhole cutter mounted on a tubing, the bottomhole cutter is made in the form of a ball valve in which the ball is in contact with a spring-loaded rod held by a ball lock in the initial position, and the cylinder of the rod pump is equipped with a tip made with the possibility of passage through the hole of the valve seat of the downhole compartment of Tell and contact with the ball.

 Figure 1 shows the lower part of the borehole pumping unit in section in the initial position without a rod pump; in FIG. 2 the lower part of the downhole pump installation in the context after lowering the sucker rod pump; in FIG. 3 the same, after raising the sucker rod pump to the surface.

 The downhole pump installation consists of a tubing 1, a rod pump 2 and a bottomhole cutter 3. The bottomhole cutter 3 body is detachable and consists of a cup 4 with an opening for fluid passage and a transition sleeve 5 connected by a sleeve 6. To the tubing 1 the bottom-hole cutter 3 is mounted using a sleeve 7. In the adapter sleeve 5 of the bottom-hole cutter 3 there is a saddle 8 with a hole, a sleeve 9 with grooves on the inner surface and a ball 10, and in the cup 4 there is a rod 11 with a spring 12, which is fixed in place ball 13. A tip 14 is mounted to the cylinder of the rod pump 2, which is configured to pass through the hole of the seat 8 and contact the ball 10 of the valve.

 Installation works as follows. When lowering the tubing 1 with the bottomhole cutter 3 / Fig. 1 / into the well, the fluid freely passes into the tubing through the hole in the nozzle 4, the grooves of the sleeve 9 and the hole of the saddle 8, without preventing the installation from lowering into the well. When installing the sucker rod pump in the tubing / Fig. 2 / its tip 14 presses the ball 10 and moves the spring-loaded rod 11, compressing the spring 12. In this case, the ball 13 leaves the slot in the glass 4 and falls out of the groove, releasing the rod 11. The downhole cutter remains in the open position during the operation of the rod pump. If necessary, repair work, the sucker rod pump is raised. After removing the sucker rod pump from the well / Fig. 3 /, the rod 11 under the action of the spring 12 presses the ball 10 against the seat 8, blocking the access of fluid to the tubing. The well is drowned during repair work. The next time the rod pump is lowered, its tip 14 again moves the ball 10 and opens the well. The described design is simple and reliable, as it uses a well-developed and repeatedly tested ball valve design.

Claims (1)

 A downhole pump installation comprising a sucker rod pump with a cylinder and a hollow plunger equipped with suction and discharge valves, and a bottomhole cutter mounted on a tubing, characterized in that the bottomhole cutter is made in the form of a ball valve in which the ball is in contact with a spring-loaded rod, ball lock held in the initial position, and the rod pump cylinder is equipped with a tip made with the possibility of passage through the hole of the seat and contact with the ball of the bottomhole valve blade.

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