RU1789775C - Well pumping unit - Google Patents

Abstract

SUMMARY OF THE INVENTION: A jet pump is installed in a well in a tubing string above a packer. The ground pump is connected by a discharge pipe to the pipe string. Liquid-gas ejectors are connected by active nozzles and outlets parallel to the pipe string. Pipes for supplying a passive medium with an ejector are connected to a dispenser and a source of gaseous medium. The suction pipe of the first of the pumps connected in series to each other is connected to the outputs of the ejectors. The discharge nozzles of the pumps are connected to the pipe string. 1 ill.

Description

The invention relates to inkjet and pumping technology, mainly to well development facilities.

The purpose of the invention is to increase efficiency.

The drawing shows the proposed installation.

The downhole pump installation includes a jet pump 3, which is installed in the borehole on the tubing string 1 (tubing) above the packer 2. The outlet of the ground pump 4 is connected to the tubing string 4. The pump inlet 4 is connected to a fluid source 19 (reservoir, separator) . The ground pump is also connected to the active nozzles of the liquid-gas ejectors 5 and 6 by the discharge pipe. The nozzles for supplying the passive medium of the ejectors 5 and 6 are connected to the dispenser 8 with a capacity of 7 and to the source of the gaseous medium 20. The outputs of the ejectors are connected in parallel to the tubing string. Additional pumps 12 and 14 are connected to each other in series. The suction pipe of the first additional pump 12 is connected to the outputs of the ejectors. The suction pipe of the second additional pump 14 is also connected to the outputs of the ejectors through the tubing string. The discharge- /) discharge pipes of the additional f pumps are connected to the tubing string. The working fluid from the fluid source 3 is supplied by a ground pump 4 to a liquid-gas ejector 5 or 6 (depending on the mode of operation). Ejectors ™ pump out air (or gas), and can also pump out surfactants from tank 7 through dispenser 8 00. A mixture is formed in the ejector and its compression. From the ejector, the gas-liquid mixture 4J is fed into the suction pipe of the first (fifth auxiliary pump 12, which through the discharge pipe enters | h into the suction pipe of the subsequent additional pump 14. Through the discharge pipe of the pump 14, the gas-liquid mixture is supplied to the tubing string 1. The mixture through the column enters the jet pump 3. The jet pump pumps out the medium from the sub-packer space, as a result, the pressure under the packer 2 decreases. The mixture of active and passive flows from the jet

the pump moves to the wellhead. As the mixture moves toward the wellhead, gas is released from the fluid, aerating it and lowering the static pressure.

When the aeration process begins, the static pressure required to supply the mixture from the jet pump 3 to the day surface / decreases and becomes less than the pressure of the liquid column in the well at the initial moment.

In order to reduce energy consumption and consequently increase the efficiency of the installation as a whole, during well development, the pressure of the active medium at the inlet to the jet pump 3 decreases after the start of the aeration process. To do this, one additional pump 14 or additional pumps 14 and 12 are turned off. The pump is turned off without stopping the ground pump 4 of the ejectors 5 or 6, the jet pump 3. The additional pump 14 is turned off without stopping the operation of the installation by ensuring the operation of the pump 14 for itself. To do this, the shut-off elements are opened on the by-pass of pump 14 and on the line connecting the discharge pipe of the previous additional pump (e.g. pump 12) to the tubing string 1. The shut-off element is opened on the tubing string. installed on the site to which the discharge pipes of the additional pumps 14 and 12 are connected. Then the shut-off element on the line connecting the discharge pipe of the additional pump 14 to the tubing string 1 is closed and the additional pump 14 is turned off. The pressure of the active stream at the inlet to the jet pump 3 decreases to such a value as to ensure stable operation of the jet pump. When the auxiliary pump 14 is turned off, the power consumed during operation of the downhole pumping unit decreases, i.e.

energy costs are reduced. As the pressure at the outlet of the jet pump 3 decreases, the auxiliary pump 12 is turned off. The number of pumps connected in series is adopted in such a way as to ensure a phased shutdown of the pumps without impairing the stable operation of the jet pump 3.

In order to intensify the process of well development by inducing oil flow into the well from the productive horizon, a pressure fluctuation process in the sub-packer space is used.

Pressure fluctuations in the under-packer

space is achieved by changing the pressure of the active medium at the inlet to the jet pump 3. Change (decrease) in the pressure of the active medium at the inlet of the jet pump 3, when the well pumping unit operates according to the scheme: ground pump 4 - liquid-gas ejector - additional pump 12 - the auxiliary pump 14 is accomplished by opening the shut-off member on the bypass of the pump 14 and by operating the auxiliary pump 14 and on itself. When the shut-off element on the bypass of the pump 14 is closed, the pressure of the active medium at the inlet to the jet pump 3 increases.

Further pressure reduction

the inlet to the jet pump 3 is achieved by opening the shut-off element on the bypass of the additional pump 12. An increase in the pressure of the active medium at the inlet to the jet pump 3 is achieved by closing the shut-off element on the bypass of the pump 12.

Thus, due to the phased shutdown of additional pumps and the provision of pressure fluctuations in the under-packer space during well development, energy costs are reduced, which increases the efficiency of the well of the pump unit.

Claims (1)

SUMMARY OF THE INVENTION A downhole pump installation comprising a jet pump installed in a well on a tubing string above a packer, a surface pump connected by a discharge pipe to a tubing string and liquid-gas ejectors connected by active nozzles and outputs parallel to the tubing string, wherein passive medium inlets ejectors connected to a dispenser and a source of gaseous medium, characterized in that; that, in order to increase the efficiency, the installation is equipped with additional pumps connected in series to each other, moreover, the suction pipe of the first additional pump is connected to the outputs of the ejectors, and the discharge pipes of the additional pumps are connected to the pipe string.