RU102699U1 - Borehole PUMP PUMP UNIT FOR OIL PRODUCTION IN COMPLICATED CONDITIONS - Google Patents

Abstract

 1. A downhole sucker rod pump unit for oil production in difficult conditions, including a downhole pump, sucker rod string, lifting string with gas bypass valves, wellhead seal, polished rod, non-return valves, discharge line and actuator, characterized in that the sucker rod string equipped with rod and wellhead blowers, and the wellhead blower is made of a precision pair of “cylinder-piston” with a continuous piston, the over-piston cavity is connected to the upper part of the separation column, ennoy on the flow line and the annulus, alternate message that is provided on the lines established posts non-return valves. ! 2. The rod pump installation according to claim 1, characterized in that the bypass valves communicating the annular space with the tube with a frequency equal to the stroke frequency of the polished rod are placed in the lifting column under the rod blowers. ! 3. The rod pump installation according to claim 1, characterized in that the wellhead seal is in communication with the pipeline with the lower part of the gas separation column.

Description

To application No. 201015442/06

Well sucker rod pumping unit for oil production in difficult conditions.

The utility model relates to oil production techniques, in particular to downhole equipment for oil production in difficult conditions, and can be used in the oil industry when pumping gas-oil mixtures with a high content of paraffin and asphalt-resinous substances from wells. Other complicating factors in which the use of the model is desirable are high wellhead pressure, high gas factor, and deposits of salts and solids.

The well sucker rod pumping unit for oil production has a structural and functional similarity with the proposed installation. (SU1341383 A, 04/21/86)

However, the negative impact of the above complicating factors, it reduces only selectively.

Known borehole sucker rod pumping unit for oil production, including a borehole pump, a string of pump rods, a lifting column with bypass gas valves, wellhead seal, polished rod, check valves, flow line and actuator (SU1691512A, 15.11.91)

By its purpose and by design, more closely proposed installation, and is its prototype. His field trials revealed an effective decrease in the rate of deposition of paraffin, tar and tar, salts and sand in the lifting column.

The objective of the present invention is to increase the efficiency of oil production in difficult conditions.

The task is achieved in that a downhole sucker rod pumping unit for oil production (hereinafter “pumping unit”), including a downhole pump, a sucker rod string, a lifting string with gas bypass valves, a wellhead seal, a polished rod, check valves, a discharge line and a drive differs from the known ones in that the column of sucker rods is equipped with rod and wellhead blowers, and the wellhead blower is made of a precision pair of cylinder-piston with a through-piston, over-piston polo st is connected to the upper part of the separation column mounted on the flow line and to the annulus, the alternating communication of which is provided by check valves installed on the communication lines. The difference also lies in the fact that the bypass valves are located in the lifting column under the rod blowers; the wellhead gland is connected by a pipeline to the bottom of the separation column.

The drawing schematically shows a well sucker rod pumping unit for oil production from wells, the characteristic of which corresponds to the above conditions.

The pump installation contains a downhole sucker rod pump lowered into the well 1, the cylinder 2 of which is connected to the tubing string 3, the plunger 4 is connected to the string of pump rods 5. On the string of sucker rods, the couplings in an amount of 1 to 5 are replaced depending on the intended purpose rod superchargers 6, the lower of which is at the depth of the onset of paraffin deposition in the lifting column. On the lifting column at the lower position of the stroke of the superchargers installed bypass gas valves 7.

At the wellhead inside the casing 8, a wellhead blower is installed, consisting of a cylinder 9 suspended from the wellhead fittings through a nozzle and a bore piston 10 connected to a polished rod 11. The casing 8 and the wellhead blower cylinder 9 form a passage 12, and a bore piston 10 with a wellhead the stuffing box 13 forms the over-piston cavity 14. The flow line 15 is equipped with a check valve 16 and a separation column 17, the upper part of which is connected to the over-piston cavity 14 by a pipe 18 with a check valve 19, and the bottom through a pipe the wire 20 - with the wellhead stuffing box 13. The plunger cavity 14, in turn, is connected to the annulus through the pipe 21 with a non-return valve 22. All lines of the wellhead valves are equipped with valves 23. The annulus (annular channel between the lifting column and the borehole) 24 and the tube space ( the inner channel of the lifting column) 25 have a corresponding piping with a separation column 17. The well pump is driven by a rocking machine 26.

Well sucker rod pumping unit for oil production works as follows. The plunger 4, making a reciprocating motion, pumps the well products into the lifting string of pipes 3, the fluid blowers 6 pick up this feed and move it further to the mouth. Due to the elastic elongation of the rod string during an upward stroke, the piston 10 in its movement is slightly ahead of the movement of the plunger 4 and blowers 6, as a result of which a slight decrease in pressure forms against the buffer pressure in the discharge line under the piston. Therefore, the check valve 19 is closed. In this case, the well pump operates without backpressure from the collection system, therefore, under light conditions.

During the downward movement of the system associated with the string of pump rods 5, the plunger 4 is immersed in the liquid inside the cylinder, passing it higher. The fluid partially occupies the volume released by the plunger. Therefore, when the non-flowing piston 10 moves downward, the pressure underneath increases and the well production overcomes the buffer pressure and is pumped into the collection system. At the same time, the gas released in the separation column is sucked into the over-piston cavity 14, which, when the piston moves backward, is pumped into the annulus 24 and then through the bypass valves 7 into the tube space 25.

The bypass valves 7 are placed in the lifting column under the rod blowers 6 at the depth of their lower stroke position, which ensures maximum pressure difference between the annular space 24 and the pipe 25, since the advance stroke of the blowers with respect to the plunger causes a certain decrease in pressure under them.

Since the separation of gas and liquid in the separation column 17 occurs in an unsteady mode (differential degassing), a lot of light (propane-butane) components, which are good solvents of paraffin, go away with the gas. These components, falling into the lifting column, wash off the paraffin deposits, and the gas (methane-ethane fractions) does the work of lifting the liquid (gas-lifting effect). The decrease in paraffin deposits in the lifting column drags over time the load growth in the drive part of the pump unit, increases the well overhaul period due to paraffin deposits.

Depending on the volume of gas entering the annulus, the operation of the well can completely switch to the gas-lift mode, in which the operation of the sucker rod pump is reduced only to dispersing and mixing the gas stream in the oil stream, thereby increasing the efficiency gas work in the lifting column. At any confluence of the situation, the entry of annular gas into the lifting column leads to a decrease in the load on the column of pump rods 5 and the head of the balancer of the rocking machine 26.

The communication between the wellhead stuffing box piping and the bottom of the separation column provides lubrication of the stuffing boxes and polished rod.

Utility Model Formula

1. A downhole sucker rod pump unit for oil production in difficult conditions, including a downhole pump, sucker rod string, lifting string with gas bypass valves, wellhead seal, polished rod, non-return valves, discharge line and actuator, characterized in that the sucker rod string equipped with rod and wellhead blowers, and the wellhead blower is made of a precision pair of “cylinder-piston” with a continuous piston, the over-piston cavity is connected to the upper part of the separation column, ennoy on the flow line and the annulus, alternate message that is provided on the lines established posts non-return valves.

2. The rod pump installation according to claim 1, the bypass valves communicating the annular space with the tube with a frequency equal to the stroke frequency of the polished rod are placed in the lifting column under the rod blowers.

3. The sucker rod pumping unit according to claim 1, the wellhead seal is connected by a pipeline to the lower part of the gas separation column.

Claims (3)

1. A downhole sucker rod pump unit for oil production in difficult conditions, including a downhole pump, sucker rod string, lifting string with gas bypass valves, wellhead seal, polished rod, non-return valves, discharge line and actuator, characterized in that the sucker rod string equipped with rod and wellhead blowers, and the wellhead blower is made of a precision pair of “cylinder-piston” with a continuous piston, the over-piston cavity is connected to the upper part of the separation column, ennoy on the flow line and the annulus, alternate message that is provided on the lines established posts non-return valves. 2. The rod pump installation according to claim 1, characterized in that the bypass valves communicating the annular space with the tube with a frequency equal to the stroke frequency of the polished rod are placed in the lifting column under the rod blowers. 3. The sucker rod pump installation according to claim 1, characterized in that the wellhead seal is in communication with the pipeline with the lower part of the gas separation column.