SU1442699A2 - Sucker-rod well pumping unit - Google Patents

Abstract

The invention makes it possible to increase the efficiency of operation of a pumping unit when pumping high-viscosity gas-rich reservoir fluids by withdrawing gas from the cylinder 5 of the sucker-rod pump 2. The column 4 of the pump rods are hollow. Column 1 pumping pipes with a column 4 form an annular space 8, filled

Description

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liquid liquid. In the cavity of the plunger 3 of the pump 2, the floating valve 9 is made. The pump 2 is installed in the well by means of a packer 10 located under the additional non-return valve 7. The valve 9 is not contiguous The invention relates to oil production techniques, in particular to well pumping shafts, can be used when pumping out of wells highly viscous gas-saturated reservoir fluids and is an improvement of the invention according to the author. No. 1291721.

The purpose of the invention is to increase the efficiency in operation when pumping highly viscous gas-saturated reservoir fluids by venting gas from the cylinder of the sucker-rod pump.

. In the drawing, a schematic representation of a well pumping unit is shown.

The well sucker pump assembly contains a sucker rod pump 2 mounted on the column 1 of the pump pipes, the plunger 3 of which is connected to the column 4 of the pump rods and is located in the cylinder 5 connected in its lower part with the annular space 6 of the well (not indicated). The connection of the lower part of the cylinder 5 with the annular space 6 is made in the form of an additional check valve 7 installed in the lower part of the cylinder, which can be made spring-loaded. The column 4 of the pump rods is made hollow, and the annular space 8 formed by the columns of the pump pipes 1 and the hollow pants 4 is filled with a thin fluid. The valve 9 installed in the cavity of the plunger 3 of the suction rod 2 is made floating, and the sucker rod pump 2 is installed in the well by means of a packer 10 located under the additional non-return valve 7. At the bottom of the cylinder 5 of the sucker rod pump 2, a suction valve 11 is also installed. the rods are suspended on the cable sling 12 and are discharged with a highly viscous fluid in the cylinder 5, and the valve 9 is opened by its own weight. The released gas enters the cavity of the column 4. 1 Il.

a drive (not shown) and rigidly connected to the plunger 3. A column of 4 hollow sucker rods at the wellhead (not indicated) of the well has a branch 13 with a check valve 14 connected to the gas gathering network (not shown) with a check valve 14. The installation is equipped with a flow line 15 with a return valve 16. The check valves 14 and 16 are installed to prevent liquid or gas from flowing back into the wellbore from the collecting network.

The installation works as follows.

During the course of the cable suspension 12 of the wellhead drive upwards, movement through the column 4 of the pump rods is transmitted to the plunger 3, which also moves upwards. This opens the suction valve 11 of the cylinder 5 of the sucker-rod pump 2, and the additional non-return valve 7, which functions as the discharge valve, is closed. In the pump cylinder 5, as the plunger 3 moves upward, the pressure drops, due to which the formation fluid from the well flows through the open suction valve 11 into the pump cylinder. Since a pressure drop takes place in the cylinder 5 of the pump, the degassing of the formation fluid occurs, i.e. gas release from oil. The upward movement of the plunger 3 is ahead of the upward movement of the intake reservoir fluid in the cylinder 5 through the suction valve 11 (due to the high viscosity of the reservoir fluid coming from the well). Moreover, since the floating valve 9 installed in the cavity of the pump plunger 3 does not come into contact with the highly viscous fluid in the pump cylinder 5, this valve is opened by its own weight, and the gas released from the liquid enters the cavity of the pump rod string 4. By the pressure of the released gas the floating valve 9 will not be closed, since the value of this pressure increases slowly for the entire period of the stroke of the plunger 3 upwards. The gas released from the liquid is discharged through the cavity of the column 4 of the pump rods and the outlet 13 by means of a check valve 14 to a collection manifold (not shown).

The movement of the cable suspension 12 of the wellhead drive down through the column 4 of the hollow sucker rods is transmitted to the plunger 3, which also moves downwards. With this level of high viscosity fluid in the pump cylinder 5, the floating valve 9 closes. By moving the plunger 3 downward with the floating valve 9 closed, the liquid is withdrawn from the cavity of the cylinder 5 through an additional check valve 7 into the annular space 6 of the well. The suction valve 11 of the cylinder 5 of the pump is closed by the pressure of the liquid in the cylinder. After filling the annular space 6 well production through the discharge

line 15 and check valve 16 enters the collecting manifold.

The cycle of the installation is then repeated at a frequency associated with the magnitude of the fluid inflow from the formation (not indicated) into the well.

Claims (1)

Invention Formula Well shtangova pump installation on avt.sv. No. 1291721, characterized in that, in order to increase operational efficiency when pumping high viscosity gas reservoir fluids by venting gas from the cylinder of a sucker rod pump, the column of pump rods is made hollow, formed by columns of pump tubes and hollow rods, the annular space is filled with low-viscosity liquid, and installed in the cavity of the plunger rod. The first pump valve is made floating, and the sucker-rod pump is installed in the well by means of a packer located under the additional non-return valve.