RU2358156C1 - Installation for simultaneous-separate operation of three reservoirs - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: installation consists of the first and the second cylinders. The first cylinder is equipped with a side valve with a filter and from below it is connected with a packer, which in its turn is connected with the second cylinder equipped with a side valve with a filter and a side opening. The second cylinder is connected to an adaptor equipped with a valve with a filter and connected to a polished tail, which is pressure tight installed in a polished cylinder of the packer-cut-off plate. Inside the first and the second cylinders there are installed plungers with valves, rigidly connected between them with a rod equipped with channels for produced liquid flow. The plungers are connected with a column of rods. The first cylinder is connected with a flow string.

EFFECT: there is facilitated working capacity at any values of pressure of operated reservoirs, also efficiency of pump in accordance with reservoir yields and possibility to operation of only one reservoir at complete isolation of another.

1 dwg

Description

The invention relates to the oil industry and may find application in the extraction of oil from three layers of one well.

Known pumping unit for the separate operation of several layers, which includes a column of elevator pipes, sucker rod pump, packer and liner. The sucker rod pump is equipped with an additional suction valve located on the side wall of the cylinder, which divides the cylinder in length into two parts, proportional to the productivity of the layers. The installation provides the possibility of entering the pump cylinder when the plunger moves upward first to produce low-pressure formation, and after the plunger passes through an additional valve, to produce high-pressure formation (RF patent No. 2221136, published. 2004.01.10).

A disadvantage of the known installation is the difficulty of separating the cylinder depending on the productivity of the layers and the practical inoperability in the conditions of the changing flow rate of at least one of the layers, which in practice often takes place.

Closest to the proposed invention in technical essence is a borehole sucker-rod pump installation comprising a sucker-rod pump with a plunger, a cylinder, suction and discharge valves, a pipe located concentrically to the pump cylinder and forming a sealed chamber with holes in the upper part for liquid to enter the plunger pump area, with a flow distributor with an additional valve and feedthroughs (RF patent No. 2293215, published. 2007.02.10 - prototype).

The installation allows the selection of fluid from two layers with different pressures. However, the installation has the following disadvantages:

- the dependence of the installation on the pressure difference of the reservoirs. With small values of the pressure differences of the exploited formations, the operation of the installation becomes impossible;

- mismatch between the actual selected production rates of each formation calculated, therefore, it is difficult to assign the optimal production rates of each formation according to the modes of field development;

- preliminary studies are required to determine the water cut of each formation. There is no direct definition of water cut;

- the inability to exploit in wells complicated by asphalt-resinous paraffin deposits (paraffin deposits);

- has a restriction on the viscosity of the selected fluid (up to 0.025 Pa · s);

- the dependence of the pump design itself on the bottomhole pressures of the exploited formations (depending on the magnitude of the pressure, one or another pump design is used);

- there is no possibility of operating only one of the layers, completely isolating the other.

The proposed invention solves the problem of ensuring operability at any pressure values of the exploited reservoirs, ensuring pump performance in accordance with the flow rates of the reservoirs, providing the possibility of operating only one of the reservoirs, completely isolating the other.

The problem is solved in that in the installation for simultaneous-separate operation of three layers, including a first cylinder with a plunger, a second cylinder, suction and discharge valves, according to the invention, the first cylinder is equipped with a side valve with a filter and connected to the packer from the bottom, which in turn is connected to a second cylinder equipped with a side valve with a filter and a side hole, the second cylinder is connected to an adapter equipped with a valve with a filter and connected to a polished shank, sealed in poly In the cylinder of the packer-cutter, inside the first and second cylinders there are plungers with valves, rigidly fastened to each other by a rod having channels for the passage of formation fluid, the plungers are connected to the rod string, and the first cylinder is connected to the tubing string.

SUMMARY OF THE INVENTION

Installation for simultaneous-separate operation of the three layers is shown in the drawing.

The installation consists of a first cylinder 1, equipped with a side valve 2 with a filter 3, on which a packer 5 is fixed by means of a sleeve 4, which separates layer I from layer II. In turn, on the packer 5, through the adapter 6, a second cylinder 7 is fixed, equipped with a side valve 8 with a filter 9 and having a side hole 10, and at the end, an adapter 11, which has a valve 12, a filter 13 and a polished shank 14. The polished shank 14 is hermetically sealed placed in a polished cylinder 15 of the packer-cutter 16, separating layer II from layer III. A plunger 17 with a valve 18 is placed inside the first cylinder 1, and a plunger 19 with a valve 20 is placed inside the cylinder 7. The plungers 17 and 19 are rigidly fastened together by a rod 21 having channels for the passage of formation fluid 22 and 23. The plungers 17 and 19 are driven using sucker rods 24. The installation is lowered into the production casing of the well 25 on the string of tubing 26 and connected to the last coupling 27.

Installation works as follows.

The installation is installed in the well 25 on the string of tubing 26 so that the packer 5 provides isolation of the seams I and II, and the packer-cutter 16 pre-deflated and installed in the production string, a pair of polished shank 14 sealed with a polished cylinder 15, provides insulation of the seams II and III.

When the plungers 17 and 19 move from the lower point, the side valve 2 is closed by the body of the plunger 17, the valves 8 and 12 open, the valves 18 and 20 close. The reservoir fluid from reservoir II through the filter 9, valve 8 fills the cavity under the plunger 17, and the reservoir fluid from formation III, passing through a polished shank 14, filter 13 and valve 12 fills the cavity under the plunger 19. Formation I does not work. At the moment of reaching and closing by the plunger 19 of the side valve 8, the passage of the side valve 2 is released from the plunger 17. Now the layer II is isolated and does not work, and the liquid from the layer I through the filter 3 and the valve 2 enters the cavity under the plunger 17; formation fluid from reservoir III continues to flow into the cavity under plunger 19. The fluid is taken from reservoir I and reservoir III until the upper stroke limit of the plungers 17 and 19 is reached.

During the course of the sucker rods 24 and plungers 17 and 19, the valves 2, 8, 12 are closed, and the valves 18 and 20 open. Formation fluids accumulated in the cavities under the plungers 17 and 19 through the channels 22 and 23 are displaced into the cavity of the tubing string 26.

Next, the cycle repeats.

With the reciprocating movement of the plungers 17 and 19 in the region between the side openings 10 and the side valve 8, the formation fluid under the plunger 17 enters only through the side valve 2 from the formation I. No fluid comes out from the formation III under the plunger 18. Thus, by fitting, it is possible to turn off or on individual layers.

The lateral hole 10 is necessary for draining the liquid from the tubing string in operations related to the lifting of the string.

The application of the proposed invention will ensure the operability of the installation at any pressure values of the exploited reservoirs, ensure pump performance in accordance with the flow rates of the reservoirs, provide the possibility of operating only one of the reservoirs, completely isolating the other.

Claims (1)

Installation for simultaneous and separate operation of three layers, including a first cylinder with a plunger, a second cylinder, suction and discharge valves, characterized in that the first cylinder is equipped with a side valve with a filter and connected to the packer from the bottom, which, in turn, is connected to the second cylinder equipped with a side valve with a filter and a side hole, the second cylinder is connected to an adapter equipped with a valve with a filter and connected to a polished shank sealed in a polished cylinder of the packer -cutter, inside the first and second cylinders are placed plungers with valves, rigidly fastened together by a rod having channels for the passage of reservoir fluid, the plungers are connected to the rod string, and the first cylinder is connected to the tubing string.