RU2643921C1 - Well sucker-rod pump - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: pump comprises a hollow plunger with a delivery valve, a cylinder with a suction valve in the lower part and an annular projection in the middle part. On the annular projection there are sealing rings which interact with the plunger side wall. Two shells of side wall of truncated cone tapering upward are mounted on the upper end of the cylinder annular projection. The shells are made with cylindrical walls on inner faces. The cylindrical walls of both shells have radial slots which do not reach the outer face of the shells. The petals of one shell are opposite the radial slots of the other shell. At that the shells, in the places between the outer face and the petals are fixed to each other by contact welding. The cylindrical walls of petals of both shells are tightly pressed against the plunger side wall. The shells are fixed against upward movement by a plate-shaped ring in the form of a conical washer. Lower conical wall of the plate ring adjoins the upper conical wall of the upper shell. Radial cylindrical recesses are made in the outer side wall of the cylinder opposite the upper conical wall of the plate ring. The bottom of each cylindrical recess is provided with a radial threaded recess equipped with a mounting screw and made with a cylindrical head with a conical end interacting with conical wall of the plate-shaped ring.

EFFECT: simplified structure and enhanced efficiency.

3 dwg

Description

The invention relates to the oil industry and is intended for oil production from wells.

A well-known sucker rod pump (a. St. USSR No. 909298, M. Cl. F04B 47/00, publ. 03/05/1982) containing a cylinder, a hollow plunger with a tube at the lower end, a fluid flow rotator made in the form of a screw and with a pipe communicating the cavity of the tube with the outer surface of the plunger. In the known pump, when the plunger moves upward, mechanical impurities fall into the gap between the plunger and the cylinder, which wear out the plunger pair and reduce its service life.

Closest to the proposed technical solution is a borehole sucker rod pump (patent RU No. 2369775, IPC F04B 47/00, publ. 10.10.2009) containing a hollow plunger with a discharge valve, a cylinder with a suction valve in the lower part and an annular protrusion in the middle part, where the o-rings are located, interacting with the side wall of the plunger. The disadvantage of the prototype is that it has a complex structure and low efficiency. Between the plunger and the cylinder there is a lubricating fluid pump that consumes energy and thereby reduces the efficiency of the prototype. The presence of a lubricating fluid pump, an oil tank, channels communicating a closed cylinder cavity with this pump and an oil tank, as well as the presence of nodes and parts of channel connections complicate the design of the prototype.

An object of the invention is to simplify the design and increase the efficiency of the device.

The stated technical problem is solved in that in a borehole sucker rod pump containing a hollow plunger with a discharge valve, a cylinder with a suction valve in the lower part and an annular protrusion in the middle part, where the sealing rings interacting with the side wall of the plunger are located, is new that the upper end face of the annular protrusion of the cylinder has two shells of the side wall of a truncated cone, tapering up, made with cylindrical walls on the inner faces, and in the cylindrical walls both shells are made radial slots that do not reach the outer edge of the shells, and the petals of one shell are opposite the radial slots of the other shell, while the shells, in places between the outer face and the petals, are attached to each other by contact welding, and the cylindrical walls of the petals of both shells tightly pressed against the side wall of the plunger, and the shell is fixed from moving upward by a plate ring having the shape of a conical washer, the lower conical wall of this ring being adjoins the upper conical wall of the upper shell, and opposite the upper conical wall of the plate ring in the outer side wall of the cylinder, radial cylindrical samples are made, from the bottom of each of which a radial threaded sample is provided, equipped with a set screw made with a cylindrical head and with a conical end interacting with conical wall of the plate ring.

In FIG. 1 shows a borehole sucker rod pump in longitudinal section; in FIG. 2 is a view A of FIG. one; in FIG. 3 is a top view of the shell of a truncated cone.

The downhole sucker rod pump comprises a hollow plunger 1 (Fig. 1) with a discharge valve 2, a cylinder 3 with a suction valve 4 in the lower part and an annular protrusion 5 in the middle part. On the annular protrusion 5 placed the sealing ring 6, interacting with the side wall 7 of the plunger. On the upper end of the annular protrusion 5 of the cylinder there are two shells 8 of the lateral wall of the truncated cone, tapering upward. Shell 8 is made with cylindrical walls 9 on the inner faces. Radial slots 10 are made in the cylindrical walls 9 of both shells, not reaching the outer edge 11 of the shells. The petals 12 of one shell 8 are located opposite the radial slots 10 of the other shell. In this case, the shells, in places between the outer face 11 and the petals 12, are attached to each other by contact welding 13. This ensures the correct assembly of the pump, since after contact welding the petals 12 of one shell 8 will always be opposite the radial slots 10 of the other shell. The cylindrical walls 9 of the petals 12 of both shells are tightly pressed against the side wall 7 of the plunger so that mechanical impurities of the formation fluid do not penetrate into the rubbing walls of the sealing rings 6 and plunger 1. The shells are fixed from moving upward by a plate ring 14 having the shape of a conical washer. The lower conical wall of the plate ring 14 is adjacent to the upper conical wall 15 of the upper shell. Opposite the upper conical wall 16 of the plate ring 14 in the outer side wall of the cylinder 3, radial cylindrical samples 17 are made, from the bottom of each of which a radial threaded sample 18 is provided, equipped with a set screw 19 made with a cylindrical head 20 and with a conical end 21 interacting with the upper the conical wall 16 of the plate ring 14. The head 20 of the screw 19, pressing against the bottom of the cylindrical selection 17, prevents spontaneous unscrewing of this screw from the threaded selection 18. When screwed ii screw 19, its tapered end 21 presses on the top conical wall 16 of the plate 14 and the ring holds the ring from moving upward. Also, this ring 14, abutting the lower conical wall against the upper conical wall 15 of the upper shell, fixes the shell 5 from axial displacement.

The principle of operation of a borehole sucker rod pump is as follows. When the plunger 1 moves upward through the cavity of the cylinder 3, as well as when moving downward, mechanical impurities of the formation fluid falling under their own weight down meet the upper conical wall of the petals 12 of the shells 8 and do not pass into the cavity A above the upper sealing ring 6. Petals 12 of one shell 8 are located opposite the radial slots 10 of the other shell, and the cylindrical walls 9 of the petals 12 are tightly pressed against the side wall 7 of the plunger 1. Therefore, the shells 8 with their petals 12 prevent the penetration of mechanical impurities th in the wall friction sealing rings 6 and piston 1. Because of this, working wall sealing rings 6 and plunger wear slightly.

In the proposed borehole sucker rod pump, unlike the prototype, there is no lubricating fluid pump and thereby the efficiency of the proposed device is increased. To prevent getting into the rubbing walls of the sealing rings and the plunger in the proposed device there are: two shells of a truncated cone, a lamellar ring in the form of a conical washer and several standard parts - set screws wrapped in threaded seals of the cylinder. Due to the lack of a lubricating fluid pump, an oil tank, channels, connection points for channels and fasteners of an oil tank and a lubricating fluid pump, the design of the proposed device is simplified.

List of information used

A. St. USSR No. 909298, M. Cl. F04B 47/00, publ. 03/05/1982; RU patent No. 2369775, IPC F04B 47/00, publ. 10/10/2009.

Claims (1)

A downhole sucker rod pump comprising a hollow plunger with a discharge valve, a cylinder with a suction valve in the lower part and an annular protrusion in the middle part, where O-rings are placed interacting with the side wall of the plunger, characterized in that two side shells are installed on the upper end of the annular protrusion of the cylinder walls of a truncated cone, tapering upward, made with cylindrical walls on the inner faces, moreover, radial slots are made in the cylindrical walls of both shells extending to the outer edge of the shells, and the petals of one shell are located opposite the radial slots of the other shell, while the shells, in places between the outer face and the petals, are attached to each other by contact welding, and the cylindrical walls of the petals of both shells are tightly pressed against the side wall of the plunger, the shells are fixed from moving upward by a plate ring having the shape of a conical washer, the lower conical wall of this ring being adjacent to the upper conical wall of the upper shell, against the upper conical wall of the ring plate in the outer side wall of the cylinder provided with radial cylindrical sample from the bottom of each of which is provided a threaded radial sampling, provided with a setscrew formed with a cylindrical head with a conical tip and interacting with the conical wall plate ring.

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