RU2323329C1 - Device for liquid injection in one well reservoir and oil production from another one - Google Patents

Abstract

FIELD: oil production, particularly obtaining from a multiple-zone well.

SUBSTANCE: device comprises pipe string with packer installed between water-bearing and oil-bearing reservoirs. Pipe string over upper oil-bearing reservoir has self-sealing packer blocking flow of liquid to be injected in water-bearing reservoir in top-down direction. Inner air-tight partition is installed between packer and self-sealing packer. Submersible plunger pump is concentrically arranged over the partition inside pipe string. The plunger pump comprises piston with through longitudinal channels and valve. Piston is rigidly connected with sucker rod string. Pipe string interior defined between pump and partition is communicated with water-bearing reservoir through radial orifice made in self-sealing packer body and pipe string. Pipe string interior defined over submersible plunder pump is communicated with discharge line of well. Casing string-borehole annulus section over self-sealing packer is communicated with lower water-bearing reservoir through annular channel created between pipe string and self-sealing packer, as well as through radial channel formed in pipe string below partition and pipe string interior below partition and through orifices made in perforated liner. Packer is made as elastic collar pressed with perforated liner from below as it rests upon well bottom. Perforated liner is telescopically put on lower part of pipe string so that it may perform limited upward sliding.

EFFECT: simplified device structure and increased pump operational efficiency along with extended functional capabilities of the device due to product taking from one reservoir and simultaneously liquid injection in another reservoir.

1 dwg

Description

The invention relates to techniques and technologies for the simultaneous selection of products from one formation and injection of fluid into another formation of the well.

A known method of pumping water into an oil reservoir (certificate of authorship No. 283120, ЕВВ 43/00, publ. BI No. 31 of 10/06/1970), carried out using an installation for pumping fluid into a reservoir containing a packer, a tubing string ( Tubing) and capacity in communication with an electric centrifugal pump.

The disadvantages of this design are:

firstly, the waterproof winding of the electric motor when filling the stator with water has sufficient performance only at a low water temperature, not more than + 25 ° C. Increasing the water temperature to 35-45 ° C significantly reduces the service life of the motor winding, and at a higher temperature the motor loses its working capacity;

secondly, the electric centrifugal pump is in an aqueous medium under high pressure, which worsens its operating conditions, while dissolved salts destroy the cable, reducing its service life.

The above reasons reduce the durability of the installation as a whole, in addition, with the help of such an installation it is impossible to pump chemically aggressive reagents into the oil reservoir, for example acids (hydrochloric, nitric, etc.), while the installation continuously pumps liquid into the reservoir with practically no change in the injection pressure , which contributes to the occurrence of an obliteration layer in the capillary holes and cracks of the formation, which constantly reduces the injectivity of the well, sometimes until the liquid is completely stopped.

Closest to the proposed technical solution is the installation for pumping fluid into the reservoir (copyright certificate No. 729336, ЕВВ 43/00, 1986, publ. BI No. 15 of 04.25.1980), containing a packer, tubing string and a container communicating 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 discharge and suction valves installed in the pipe string, upper and lower level sensors, tanks, control station for switching the direction of rotation of the electric motor;

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

thirdly, the installation does not allow simultaneous selection of products from one formation and pumping fluid into another formation of the well.

An object of the invention is to simplify the design of the installation and increase the efficiency of the pump while expanding the functionality of the installation due to the simultaneous selection of products from one formation and pumping fluid into another formation of the well.

This problem is solved by the installation of a pump for pumping fluid into one formation and extracting oil from another formation of the well, containing a pipe string with a packer installed between the layers.

What is new is that the pipe string above the upper aquifer is equipped with a self-sealing packer that does not pass from top to bottom, and between the packers - with an internal sealed partition, while the pump is made by a submersible plunger installed in the pipe string above the partition, and the space of the pipe string between the pump and the partition communicated with the upper layer, and the annular space of the pipe string above the self-sealing packer with the lower layer, while the packer is made in the form of an elastic cuff, pressed against the bottom of the perforator bathrooms shank at its support face on which the outside telescopically fitted onto the bottom of the pipe string, with limited movement upwards.

The drawing schematically shows an installation for pumping fluid into one formation and oil production from another formation of the well.

Installation for pumping fluid into one (aquifer) formation 1 and oil production from another (oil) formation 2 of well 3 comprises a pipe string 4 with a packer 5 mounted between the aquifer 1 and the oil 2 formations.

The pipe string 4 above the upper oil reservoir 2 is provided with a self-compacting packer 6 that does not allow fluid to be pumped into the aquifer 1 from top to bottom. Between the packer 5 and the self-sealing packer 6, an internal sealed partition 7 is installed, above which in the pipe string 4 a submersible plunger pump 8 is concentrically mounted, consisting of a piston 9 with through longitudinal channels 10 and a valve 11, while the piston 9 is rigidly connected to the column of pump rods 12 .

The inner space 13 of the pipe string 4 between the pump 8 and the baffle 7 is communicated with the aquifer 1 through a radial hole 14 made in the housing of the self-sealing packer 6 and the pipe string 4, and the inner space 15 of the pipe string 4 above the submersible plunger pump 8 is communicated with a flow line ( not shown) wells 3.

The annular space 16 of the pipe string 4 above the self-sealing packer 6 is communicated with the lower aquifer 1 through an annular channel 17 made between the pipe string 4 and the self-sealing packer 6, as well as a radial hole 18 made in the pipe string 4 below the partition 7 and the inner space 19 pipe string 4 below the partition 7, and through holes 20 made in the perforated shank 21.

The packer 5 is made in the form of an elastic cuff 22, pressed from below by a perforated liner 21 while resting on the bottom hole 23 of the well 3. The perforated liner 21 is telescopically externally mounted on the bottom of the pipe string 4 with limited upward movement.

Installation works as follows.

Before starting the installation into operation, the installation of the installation is carried out in the well 3, as shown in the drawing, after which the upper end of the string 4 is tied at the wellhead 3 with a flow line (not shown), and the annular space 16 of the pipe string 4 at the wellhead 3 is connected to discharge line (not shown). After that, the installation is put into operation, while for the extraction of oil from the oil reservoir 2 from the wellhead 3, the piston 9 of the submersible plunger pump 8, mounted concentrically inside the pipe string 4, is driven by means of a pump rod string 12. The piston 9 makes a limited relative to the pipe string 4 reciprocating movement. In the process of moving the piston 9 upward, oil is sucked from the oil reservoir 2 through the radial hole 14 into the inner space 13 of the pipe string 4 between the pump 8 and the baffle 7, while the valve 11 of the submersible rod pump 8 is closed.

Next, the pump rods 12 and the piston 9 of the submersible plunger pump 8 rigidly connected to it move downward, while the valve 11 of the submersible rod pump 8 opens and the inner space 15 of the pipe string 4 is filled above the piston 9 through the inner space of the latter and its through longitudinal channels 10 . In the future, the cycle of operation of the submersible sucker-rod pump is repeated, while filling the internal space 15 of the pipe string 4 with oil above the piston 9 of the submersible plunger pump 8 the development of the column of oil in the pipe string 4 of the wellhead 3, oil flows into the flow line.

Thus, there is a process of oil production from the oil reservoir 2. At the same time, fluid (for example, wastewater) is injected into the aquifer 1 from the wellhead 3 along the injection line (not shown) into the annulus 16 of the pipe string 4 through the annular channel 17 , the radial hole 18 of the pipe string 4 and further along the inner space 19 of the pipe string 4 below the baffle 7 through the through holes 20 made in the case of the packer 5, enters the annular space 21, as it is filling, the fluid is pumped in aquifer 1 (depending on the pickup aquifer 1).

The proposed installation for injecting fluid into one formation and oil production from another formation of the well has a simple design, in addition, a deep-well pump is installed directly in the interval of the oil reservoir of the well, which improves its efficiency, and the possibility of simultaneous selection of products from one formation and injection fluid in another wellbore allows you to expand the functionality of the installation.

Claims (1)

Installation for pumping fluid into one formation and oil production from another formation of the well, containing a pipe string with a packer installed between the layers, a pump, characterized in that the pipe string above the upper aquifer is equipped with a self-sealing packer that does not pass from top to bottom, and between packers - an internal sealed partition, while the pump is made by a submersible plunger installed in the pipe string above the partition, and the space of the pipe string between the pump and the partition is communicated with the upper layer, and the column the pipe string, the space above the self-sealing packer - to the lower reservoir while the packer is in the form of an elastic cuff biasing bottom perforated liner during its reliance on the face which is externally telescopically fitted onto the bottom of the pipe string, with limited movement upwards.