RU2360145C1 - Oil-well pump - Google Patents

Abstract

FIELD: motors and pumps.

SUBSTANCE: pump consists of an operating couple of equipment such as plunger and cylinder with traveling valve and standing valve being installed in them, and entrained solids filter. The filter is coupled with pump suction, and underneath it is provided with a tank to preliminary accumulate entrained solids. The entrained solids filter consists of concentrically arranged pipes. The upper part of the external pipe and lower part of the internal pipe provide hydraulic connection of well bottom with pump suction. The tank intended for preliminary accumulating entrained solids is implemented as a continuation of the external filter pipe and provided with a spring-loaded valve installed in the lower part of the tank. The distance from the pump to the spring-loaded valve is longer than the distance from the pump to the perforation interval. By virtue of this invention, the efficiency of pump operation is increased due to pumped liquid cleaning from entrained solids accumulated in well bottom and their removal by rinsing during wellbore intervention.

EFFECT: increased time between overhauls due to entrained solids separation during pump operation and reduced deterioration of operating couple such as plunger-cylinder and pump valve units.

1 dwg

Description

The invention relates to techniques for oil production, in particular to downhole sucker rod pumps.

The invention can be used for pumping liquids containing mechanical impurities from wells.

A well-known sucker-rod pump containing a working pair of a plunger-cylinder with pressure and suction valves installed respectively, and a filter for gas separation associated with the intake of the pump, the filter is made in the form of a load finned on the outer surface, and its connection with the intake of the pump is carried out using flexible hose (author's certificate of the USSR No. 1035282, 08/15/83. Bull. No. 30).

The disadvantage of this borehole pump is the high probability of filter contamination.

A well-known sucker-rod pump containing a working pair of a plunger-cylinder with pressure and suction valves installed respectively, the filter is made in the form of a perforated cylindrical container. The filter is connected to the pump intake. The filter before receiving the pump is equipped with a sealed cylindrical tank installed under it. The capacity of the flexible connection is connected to the filter, the filter is connected by a flexible hose to the pump intake (USSR Authors Certificate No. 1439282, 11.23.88. Bull. No. 43).

The disadvantage of this borehole pump is the lack of efficiency due to the small capacity. When the container is filled with mechanical impurities, separation of mechanical impurities in the pumped liquid does not occur; pump wears out.

The problem to be solved and the expected technical result: increasing the efficiency of the pump in operation by ensuring the purification of the pumped liquid from mechanical impurities that accumulate on the bottom of the well and are removed by washing during underground repairs. The overhaul period (MCI) of the well will increase due to the separation of mechanical impurities during the entire period of operation of the pump and, accordingly, the wear of the working pair of the plunger-cylinder and valve assemblies of the pump will decrease.

The problem is solved in that the proposed borehole sucker rod pump containing a working pair of plunger-cylinder with discharge and suction valves installed respectively, a filter of mechanical impurities associated with the intake of the pump and equipped with a bottom capacity for preliminary accumulation of mechanical impurities, characterized in that the filter is mechanical impurities consists of concentrically arranged pipes, the upper part of the outer pipe and the lower part of the inner pipe hydraulically communicate the bottom hole m of the pump, and the capacity for preliminary accumulation of mechanical impurities is made in the form of a continuation of the outer filter pipe and is equipped with a spring-loaded valve installed in the lower part of the tank, and the distance from the pump to the spring-loaded valve is greater than the distance from the pump to the perforation interval.

The drawing shows a diagram of a downhole sucker rod pump. Here:

1 - plunger

2 - cylinder

3 - discharge valve

4 - suction valve

5 - holes in the upper part of the outer pipe

6 - an external pipe

7 - an internal pipe

8 - holes in the lower part of the inner pipe

9 - capacity preliminary accumulation of mechanical impurities

10 - spring-loaded valve

11 - perforation interval

12 - mechanical impurities

13 - spring.

The movement of the liquid is shown in the drawing by solid arrows; detachable solids - dashed.

In the working pair, the plunger 1 - cylinder 2, respectively, discharge and suction valves 3, 4 are installed. The filter of mechanical impurities is made in the form of two concentric pipes: outer 6 and inner 7. In the upper part of the outer pipe 6 there are openings 5, in the lower part of the inner pipe 7 there are openings 8 through which fluid enters the pump intake. The capacity for preliminary accumulation of mechanical impurities 9 is the lower part of the extension of the outer pipe 6, at the lower end equipped with a valve 10 with a spring 13. The distance from the borehole sucker rod pump to the spring loaded valve 10 is greater than the distance from the borehole sucker rod pump to the perforation interval 11.

The proposed well pump operates as follows. The liquid from the bottom of the well through the holes 5 enters the outer pipe 6 perforated in the upper part, then passes into the inner pipe 7 of a smaller diameter, perforated in the lower part, through the openings 8 and enters the borehole sucker rod pump. When the fluid passes through pipes 6 and 7, the mechanical impurities 12 contained in the liquid are deposited in the preliminary accumulation tank of mechanical impurities 9 and accumulate above the valve 10. As the mechanical impurities 12 accumulate, their mass above the spring-loaded valve 10 increases, and it is under the influence of gravity mechanical impurities 12 opens, reporting the capacity of the preliminary accumulation of mechanical impurities 9 and the bottom of the well. The mechanical impurities 12 are lowered into the sump below the perforation interval 11. The distance from the downhole sucker rod pump to the valve should be greater than the distance from the downhole sucker rod pump to the perforation interval 11 to prevent mixing of the downhole fluid flowing up to the downhole sucker pump and the mechanical fluid flowing from the downhole pump impurities 12 accumulating in the preliminary accumulation tank 9. After the mechanical impurities 12 are discharged from the preliminary accumulation tank of mechanical impurities 9 a spring-loaded valve 10 is released from the force of gravity caused by the weight of the accumulated solids 12 and under the action of spring 13 closes, thereby closing the connection with the produced fluid intake of the pump through the lower portion of the outer tube 6.

The proposed borehole pump is thus more efficient in operation: its use can significantly increase the well MCI due to the separation of mechanical impurities from the produced fluid during the entire period of operation of the pump and reduced wear of the working pair of the plunger-cylinder and valve assemblies of the pump.

Claims (1)

A well sucker rod pump containing a working pair of plunger - cylinder with pressure and suction valves installed respectively, a filter of mechanical impurities associated with the intake of the pump and equipped with a bottom for preliminary accumulation of mechanical impurities, characterized in that the filter of mechanical impurities consists of concentrically arranged pipes, the upper part of the outer pipe and the lower part of the inner pipe hydraulically communicate the bottom of the well with the intake of the pump, and the capacity of the preliminary accumulation mechanical impurities made in the form of a continuation of the outer filter pipe and is equipped with a spring-loaded valve installed in the lower part of the tank, and the distance from the pump to the spring-loaded valve is greater than the distance from the pump to the perforation interval.