RU2655485C1 - Well rod pumping unit - Google Patents

Abstract

FIELD: engines and pumps; oil and gas industry.

SUBSTANCE: invention relates to oil recovery techniques and, in particular, to downhole sucker rod pumps. Device includes a sucker rod pump, a string of pump pipes and rods and a wellhead air-compensator. This pneumatic compensator consists of two hemispheres. They are fastened together by pins and installed in a sealed environment that is insulated from the environment. Inside the chamber, a well is drilled with a depth exceeding the depth of freezing of the soil. Well is closed by a metal grate. Camera body has a hinged cover. Working cavity of the air compensator is connected to the annulus of the well through the spring safety valve.

EFFECT: reduction in the metal capacity level of the air-compensator and increase in its efficiency in cold weather conditions.

1 cl, 2 dwg

Description

The invention relates to the field of oil production, in particular to installations of sucker rod pumps.

A well-known sucker rod pump installation containing a pump, columns of pump pipes and rods, a compensator made in the form of a pipe, coaxially mounted relative to the column of pump pipes and forming a chamber with it, communicated with the internal cavity of the pump pipes through the holes in the pump pipe (RU 2418941, 12.01 .2010).

The disadvantage of this technical solution is the reduced volume of the working chamber due to the limited cross section of the well.

The closest in design is known to the sucker rod pumping unit, which contains a pump, a string of pump pipes and rods and a pneumatic compensator with an elastic partition. The pneumatic compensator is located at the wellhead, the lower part of the pneumatic 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 with pins, and the lower half of the working chamber is in communication with the discharge line of the pump unit ( RU 164585, 09/10/2016).

The disadvantage of this technical solution is the metal consumption of the wellhead pneumatic compensator due to the installation of an additional element - a liner for the formation of a spherical working chamber, as well as a decrease in the efficiency of the gas chamber of the pneumatic compensator in the cold season.

The objective of the invention is to reduce the metal consumption of the wellhead pneumatic compensator by changing the lower part of the body and increasing its efficiency in the cold season by installing in a chamber with a drilled small well (pit) for heat from underground.

This problem is solved in that in a sucker rod pump installation containing a pump, a string of pump pipes and rods and a wellhead pneumatic compensator, according to the proposed technical solution, the lower part of the casing is made in the form of a hemisphere, the pneumatic compensator is installed in a chamber inside which a well is drilled with a depth exceeding the depth of freezing of the soil moreover, the well is closed by a metal grill, and the camera body has a hinged lid, the working cavity of the pneumatic compensator is in communication with the annulus of the well s via a spring safety valve.

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.

A downhole sucker rod pump installation includes ground equipment, which includes a rocking machine 1, wellhead fittings 2, wellhead pneumatic compensator 3 connected to a flow line 4, a well (pit) 5 for supplying heat from underground, a spring safety valve 6, a metal grill 7, an insulating chamber 8, a heater 9, and underground equipment, including a string of pumping pipes 10, a string of rods 11, a downhole pump 12.

The wellhead pneumatic compensator 3 (Fig. 2) consists of the lower 13 and upper 14 hemispheres, which are fastened together by pins 15. The spherical working chamber contains an elastic diaphragm 16. A cover 17 is fastened to the upper hemisphere by means of bolts 18. A valve 19 for injection is installed on the cover air into the diaphragm 16, a pressure gauge 20 for monitoring the gas pressure in the diaphragm and a cap 21 for protection against damage to the pressure gauge valve, which is attached to the cover with bolts. A stabilizer 22 is installed at the bottom of the diaphragm 16. The stabilizer is attached to the core 23 with a bolt.

Installation works as follows.

Before putting the wellhead pneumatic compensator into operation through the valve 19, 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 receives part of the liquid through the outlet into the working chamber, compressing the gas in the diaphragm 16. When the pressure in the flow line decreases, the diaphragm 16 pushes the received liquid back into the discharge line due to the compressed gas. The well (pit) 5 is designed to transfer warm air from underground to the insulating chamber 8, which is necessary to maintain a constant ambient temperature of the pneumatic compensator. The insulating chamber 8 has a hinged lid 17 for opening the chamber during monitoring of the operation and repair of the pneumatic compensator 3. To prevent a person from falling into the well (pit) 5 during monitoring of the operation and repair of the pneumatic compensator 3, it is covered with a metal grill 7.

In the case of sudden pressure surges in the wellhead pneumatic compensator 3, the spring-loaded safety valve 6 will allow to discharge part of the liquid into the annulus.

Changing the lower part of the pneumatic compensator housing will reduce metal consumption, and its installation in a chamber with a drilled small well will increase the efficiency of the pneumatic compensator in the cold season.

Claims (1)

A downhole sucker rod pump installation comprising a pump, a string of pump tubes and rods, a plunger pump and an air compensator with an elastic diaphragm located at the wellhead, characterized in that the lower part of the air compensator body is made in the form of a hemisphere, and the air compensator is installed in a sealed chamber that is sealed from the environment inside which a well has been drilled with a depth exceeding the depth of freezing of the soil, moreover, the well is closed with a metal grill, and the camera body has a hinged lid, Static preparation pnevmokompensatora cavity communicates with the borehole annulus via a spring safety valve.

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