RU2287673C1 - Plant for forcing liquid from upper bed into lower bed of well - Google Patents

Abstract

FIELD: oil industry, technology for cyclic forcing of liquid into oil bed during its water saturation or injection of various reagents into said bed.

SUBSTANCE: device contains packer, column of pipes with suction valve, pump. In accordance to invention mouth of device may be pressurized. Pipes column is provided with bypass channel. Pump is made in form of electric down-pump, which is mounted above suction valve in composition of pipes column below bypass channel, through which hollow of pipe column above the pump is connected to lower bed. Hollow of pipes column below the pump may be connected to upper bed during transit of liquid from behind-column space above the packer - upper bed zone into lower bed by means of a pump. Between this pump and suction valve, sensor of pressure from liquid of upper water bed is mounted in behind-column space with possible enabling and disabling of pump.

EFFECT: simplification of device with simultaneous increase of its operation efficiency.

1 dwg

Description

The invention relates to techniques and technology for pumping liquid into an oil reservoir during its flooding or injection into it of various reagents.

A known method of pumping water into an oil reservoir (copyright certificate No. 283120, E 21 B 43/00, publ. BI No. 31 of 06.10.1970), carried out using the installation for pumping fluid into a reservoir containing a packer, tubing string pipes (tubing) and a tank in communication with an electric centrifugal pump.

The disadvantages of this design are:

firstly, the metal consumption and design complexity due to the large number of nodes and parts (sedimentation tank, metering and distribution unit, etc.);

secondly, the electric centrifugal pump does not turn off in the absence of fluid at its intake, which can lead to its failure;

thirdly, in the case of stopping the centrifugal pump, liquid from the oil reservoir, at a certain pressure, can freely flow into the aquifer.

Closest to the proposed technical solution is the installation for pumping fluid into the reservoir (copyright certificate No. 729336, E 21 B 43/00, 1986, publ. BI No. 15 of 04.25.1980), containing a packer, tubing string and capacity in communication with the pump, while it is equipped with discharge and suction valves mounted on the tubing string, located lower and higher, respectively, of the packer, the upper cavity of the tubing string and the container being partially filled with oil.

The disadvantages of this device design are:

firstly, the complexity of the design, due to the presence of the upper and lower level sensors, capacities, control stations for switching the direction of rotation of the engine;

secondly, the oil in the tubing string, used as a working fluid to drive the fluid injected into the reservoir, loses its chemical and physical properties during operation due to contact and mixing with the fluid injected into the reservoir, and therefore during the operation of the installation, constant and strict control of the chemical composition of the oil is required;

thirdly, the pump is made in surface design, so the lower the reservoir pressure and the lower the aquifer is from the surface, the lower the efficiency of its use;

fourthly, the electric centrifugal pump does not turn off in the absence of fluid at its intake, which can lead to its failure.

An object of the invention is to simplify the design of the installation while improving its efficiency by turning off the pump in the absence of fluid at its intake and then turning on the pump when a certain pressure of the fluid at its intake is reached.

This problem is solved by the installation for pumping fluid from the upper formation into the lower formation of the well containing a packer, a pipe string with a suction valve, a pump.

What is new is that the pipe string is equipped with a bypass channel, and the pump is made in the form of an electric submersible pump, which is installed above the suction valve as a part of the pipe string below the bypass channel, through which the cavity of the pipe string above the pump is in communication with the lower layer, while the pipe string cavity below the pump through the suction valve is in communication with the upper reservoir, and between the pump and the suction valve a fluid pressure sensor is installed with the possibility of turning the pump on and off.

The drawing shows the proposed installation for pumping fluid.

Installation for pumping fluid from the upper aquifer 1 into the lower oil reservoir 2 of the well 3 consists of a packer 4, lowered on the pipe string 5 with a suction valve 6 at the end.

An electric submersible pump 7 is installed above the suction valve 6 as part of the pipe string 5. The pipe string 5, above the electric submersible pump 7, is additionally equipped with a bypass channel 8 through which the upper cavity 9 of the pipe string 5, above the electric submersible pump 8 is connected to the lower oil reservoir 2, and the lower cavity 10 of the pipe string 5, below the electric submersible pump 7, communicates with the upper aquifer 1 through the suction valve 6. Date is set between the electric submersible pump 7 and the suction valve 6 IR liquid head 11 having a possibility of turning on and off an electrical submersible pump 7.

The packer 4 hermetically divides the annular space 12 of the well 3 into two parts above the packer 4 and the annular space 13 below the packer 4.

Installation for pumping liquid works as follows.

Before starting the installation into operation, the wellhead (not shown) of the well 3 is sealed.

Start the electric submersible pump 7 in the work. The electric submersible pump 7 begins to pump liquid from the annulus 12 above the packer 4, that is, from the zone of the upper aquifer 1, through the opening suction valve 6, the pressure sensor 11 and then through the lower cavity 10 into the upper cavity 9 of the pipe string 5. From the upper of the cavity 9, the liquid through the bypass channel 8 of the pipe string 5 enters the annulus 13 below the packer 4, from where it is pressed into the lower oil reservoir 2 of the well 3.

Liquid injection from the upper aquifer 1 of the well 3 into the lower oil reservoir 2 continues until the liquid in the annulus 12 above the packer 4 ends. This occurs if the capacity of the electric submersible pump 7 exceeds the flow (flow) of fluid from the upper aquifer 1 in the annulus 12 above the packer 4.

When the liquid level decreases in the annular space 12 above the packer 4, the liquid flow through the liquid pressure sensor 11 stops, which responds to this and turns off the electric submersible pump 7.

The installation is turned off while filling the annular space 12 above the packer 4 with liquid from the upper aquifer 1. When the electric submersible pump 7 is turned off, the suction valve 6 closes and prevents the liquid from returning from the lower oil reservoir 2. During the filling of the annular space 12, above the packer 4, the liquid through the suction valve 6 begins to flow from bottom to top into the pipe string 5. When the liquid level rises before receiving the electric submersible pump 7 and reaches a certain value the pressure head, the fluid pressure sensor 11 sends a signal to turn on the electric submersible pump 7. Again begins the injection of fluid from the upper aquifer 1 into the lower oil reservoir 2 of the well 3.

The proposed installation for pumping fluid from the lower reservoir into the upper reservoir of the well has a simple design, and if there is no fluid at the pump intake, it is turned off, and vice versa, as the fluid arrives at the pump and the fluid reaches a certain pressure, the pump is turned on, in addition , the installation eliminates the return of fluid from the injected reservoir, which generally improves the efficiency of the pump installation.

Claims (1)

Installation for pumping fluid from the upper reservoir into the lower reservoir, containing a packer, a pipe string with a suction valve, a pump, characterized in that it has the ability to seal the mouth, the pipe string is equipped with a bypass channel, and the pump is made in the form of an electric submersible pump, which is installed above the suction valve in the pipe string below the bypass channel through which the cavity of the pipe string above the pump is in communication with the lower layer, while the cavity of the pipe string below the pump has the possibility of communication from the upper m reservoir when pumping fluid from the annulus above the packer - the zone of the upper reservoir into the lower reservoir by the pump, between which and the suction valve there is a pressure sensor from the liquid of the upper aquifer in the annulus with the ability to turn the pump on and off.