SU1193293A1 - Well sucker-rod pumping plant - Google Patents

Description

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The invention relates to a technique for oil production, in particular to well pumping sucker-rod units, and can be used mainly when pumping from wells with a high coefficient of productivity of formation fluids with a large gas factor.

The purpose of the invention is to increase the efficiency when operating in wells where the gas pressure in the annulus is less than in the supply pipeline.

Figure 1 shows a well sucker-rod pumping unit, a general view when taking annular gas into a column of pumping pipes; Fig.2 is the same, when the annular gas is injected from the cavity of the tubing string into the discharge pipe; FIG. 3 shows a check valve installed at the wellhead; figure 4 is additionally installed on the column of pumping pipes overflow valve.

A well pumping unit comprises a pumping pump 1, in a cylinder 2 of which, connected to the column of pumping pipes 3, a plunger 4 is placed, through a column of pumping rods 5 connected to the drive 6, and a valve 7 is installed on the column of pumping pipes 3, communicating. the annulus 8 of the well with the cavity of the column of pump tubes 3. On the column of pump tubes 3 under the check valve 7 is additionally installed overflow valve 9 with a spring-loaded locking element 10 and a calibrated outlet 11.

A column of pump rods 5 connecting the plunger 4 with the actuator 6 passes through the wellhead fittings 12. A check valve 7 connecting the annulus 8 of the well with the cavity of the column of pump tubes 3 and serves to release gas from the annulus 8 into the tubing string 3 , is installed on the column of pumping pipes 3 at the wellhead (not indicated). The calibrated outlet of the overflow valve 9 has formed by installing a fitting 13 in the valve body 14. The cavity of the column of pump tubes 3 is in communication with the discharge pipe 15, on which the check valve 16 is installed.

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A borehole sucker pump unit operates as follows. After the descent of the underground part (not indicated) of the pumping unit in

5, the wellhead fitting 12 is turned on by a drive 6. The sucker-rod pump 1 starts to pump out the fluid from the well. At the same time, the tubing string 3 is filled to

o wellhead reservoir fluid. During the course of the plunger 4 of the sucker-rod pump 1 upward, the pressure at the level of the additional overflow valve begins to increase.

5 When the pressure reaches the values sufficient to open the overflow valve 9 (but always less pressure than in the discharge pipe 15 of the well), i.e. compress the spring (not

20 is indicated) and the lifting of the locking element 10, the overflow valve 9 is opened and part of the formation fluid supplied by the sucker rod pump 1 flows out of the column of pumping pipes 3 through

5 calibrated hole 11 fittings 13 in the annulus 8 wells. Released from gas, this fluid re-enters the sucker rod pump 1.

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Remaining part of the reservoir fluid in the pumping column, 3, failing to move into the annular space 8 during plunger 4, through the check valve 16 enters the discharge pipe 15. After reaching the extreme top point, the plunger 4 moves downwards. 3 level

 reverse 7 and overflow 9 valves fall off. When the specified pressure is reached, the pressure of closing the additional overflow valve 9 closes 5 seconds, and from the annulus 8 through the check valve 7 under the action of pressure difference in the column of pumping pipes 3 and the annulus 8 is drawn into the column

0 pump pipe 3 gas (figure 1).

During the subsequent course of the plunger 4 upwardly, the gas is compressed and, together with the part of the pumped by sucker-rod pump 1, the liquid enters the discharge pipe 15 (figure 2). In the following, the cycle repeats.

Claims (1)

(5 ^) A Borehole PUMP PUMP UNIT containing a sucker rod pump, in the cylinder of which is connected to the string of pump pipes, a plunger is placed through the string of pump rods connected to the drive, and a check valve installed on the string of pump pipes connecting the annular space of the well with the string cavity pump pipes, characterized in that, in order to increase efficiency when working in wells where the gas pressure in the annulus is less than in the flow line, an additional pipe is installed on the pump pipe string overflow valve with spring-loaded locking element _β and calibrated outlet port. I /