RU164585U1 - Borehole PUMP PUMP UNIT - Google Patents

Abstract

A downhole sucker rod pump installation comprising a pump, a string of pump tubes and rods and an air compensator with an elastic partition, characterized in that the air compensator is located at the wellhead, the lower part of the air compensator is made in the form of a cylinder with an insert in the inner part, forming a spherical working chamber together with the upper hemisphere while the cylinder and the hemisphere are fixed to each other by pins, and the lower half of the working chamber is in communication with the flow line of the pump unit.

Description

The utility model relates to the field of oil production, in particular to downhole sucker rod pump installations.

A well-known sucker-rod pumping unit including a ground drive, a sucker-rod sucker-rod pump, pump pipes, rods and compensators made in the form of nozzles, coaxially mounted relative to the pump pipe string (SU 662701, 05/25/1979).

A disadvantage of the known technical solution is the fluctuation of wellhead pressure over a wide range due to the operation of the single-acting deep well pump, the fluid supply of which is carried out mainly during the upward stroke of the plunger. The existing situation of uneven fluid supply is exacerbated by the rise of highly viscous oil.

Closest to the principle of operation, a well-known sucker-rod pumping unit is known, which contains a string of pipes and rods, a compensator made in the form of a nozzle, coaxially mounted relative to the pumping pipes and forming a chamber with it, communicating with the internal cavity of the pumping pipes through openings in the pumping pipe (RU 2418941 01/12/2010).

The disadvantage of this technical solution is the limited cross section of the well, respectively, a reduced volume of the working chamber.

The solved problem of the utility model is to ensure the optimal size of the working chamber of the pneumatic compensator.

This problem is solved in that the sucker rod pump installation containing a pump, a string of pump pipes and rods and a pneumatic compensator, characterized in that the pneumatic compensator is located at the wellhead, the lower part of the pneumatic compensator is made in the form of a cylinder with a liner in the inner part, forming a spherical working chamber together with the upper hemisphere, fixed to each other by pins, the lower half of the working chamber in communication with the discharge line of the pumping unit.

In FIG. 1 schematically shows a General view of a downhole sucker rod pump installation.

In FIG. 2 shows the device of the wellhead pneumatic compensator

Downhole sucker rod pump installation contains:

1 - a rocking machine;

2 - wellhead reinforcement;

3 - wellhead pneumatic compensator;

4 - flow line;

5 - a string of pumping pipes.

The pneumatic compensator 3 (Fig. 2) consists of the lower cylindrical part 6 and the upper hemisphere 7, which are fastened together by pins 8. The spherical working chamber 10 contains a liner 11 and an elastic diaphragm 12. A cover 13 is attached to the hemisphere with bolts 14. On the cover a valve 15 is installed for injecting air into the diaphragm 12, a pressure gauge 16 for monitoring the gas pressure in the diaphragm and a cap 17 for protection against damage to the pressure gauge valve, which is attached to the cover with bolts 18. A stabilizer 19 is installed in the lower part of the diaphragm 12. p is attached to the core 20 with a bolt 21.

Installation works as follows.

Before installing the pneumatic compensator on the flow line of the rocking machine through the valve 13, gas, for example nitrogen, is pumped into the diaphragm 16. After the gas is pumped to the design pressure, the valve closes.

With increasing pressure in the flow line 4, the pneumatic compensator takes part of the liquid into the working chamber 10, compressing the gas in the diaphragm 12. When the pressure in the flow line decreases, the diaphragm 12 pushes the received liquid back into the discharge line due to the compressed gas. The installation of a pneumatic compensator at the mouth of the sucker-rod pumping unit will provide pressure equalization at the wellhead, which will reduce the load on the pump pipe string, rods, on the wellhead and on the balancer head, thereby increasing their service life.

Claims (1)

A downhole sucker rod pump installation comprising a pump, a string of pump tubes and rods and an air compensator with an elastic partition, characterized in that the air compensator is located at the wellhead, the lower part of the air compensator is made in the form of a cylinder with an insert in the inner part, forming a spherical working chamber together with the upper hemisphere while the cylinder and the hemisphere are fixed to each other by pins, and the lower half of the working chamber is in communication with the flow line of the pump unit.

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