RU2325514C1 - Fluid injection in upper formation and oil extractions from bottom formation - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to engineering and technology of simultaneous bleeding of products from one formation and fluid injection in other formation of a hole. It provides simplification of installation, efficiency upgrading of pump operation and expansion of functionality due to simultaneous bleeding of products from one formation and fluid injection in other formation of a hole. Essence of the invention: device contains a pipe string with the packer installed between pointed formations, and also the pump. The pump is executed plunger and is installed concentrically as a part of a pipe string. The pump consists of the cylinder piston with end-to-end longitudinal channels and the flap, thus the cylinder piston is rigidly connected with a rod string. The packer is executed in the form of the resilient sleeve gasket which is drawn in from below by a perforated liner at its bearing on a bottom-hole which is put outside telescopically on a bottom of a pipe string with possibility of the bounded movement upwards. The bottom is executed in the form of a hollow landing seat screwed on a pipe string down hole end. The room of a pipe string below a ram pump is directly connected with the bottom formation through openings of a perforated liner and annulus room of a pipe string below a packer. The annulus room of a pipe string above a packer is connected with an upper formation.

EFFECT: installation simplification of products bleeding from one formation and fluid injection in other formation of a hole and efficiency upgrading of pump operation and expansion of functionality.

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Description

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

There is a method of pumping water into an oil reservoir (copyright certificate SU No. 283120, ЕВВ 43/00, publ. BI No. 31 of 10/06/1970), carried out using an installation for pumping liquid into a reservoir containing a packer, 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 35-40 ° C significantly reduces the service life of the motor winding, and at a higher temperature the motor loses its functionality;

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 in communication with a pump, while it is equipped with discharge and suction valves installed 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 stations 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 the upper reservoir and oil production from the lower reservoir containing a pipe string with a packer installed between the layers.

What is new is that the pump is made plunger installed in the pipe string, and the space of the pipe string below the pump is directly communicated with the lower layer through the annular space of the pipe string below the packer, and the annular space of the pipe string above the packer with the upper layer, while the packer is made in the form of an elastic cuff, pressed from the bottom by a perforated shank when it is supported on the bottom, which is telescopically worn from the outside on the bottom of the pipe string with the possibility of limited upward movement.

The drawing schematically shows the installation for pumping fluid into the upper reservoir and oil production from the lower reservoir.

Installation for pumping fluid into the upper reservoir 1 and oil production from the lower reservoir 2 in the well 3 includes a pipe string 4 with a packer 5 installed between the aquifer 1 and the oil reservoir 2, as well as a pump 6.

The pump 6 is made plunger and concentrically installed in the pipe string 4. The pump 6 consists of a piston 7 with through longitudinal channels 8 and a valve 9, while the piston 7 is rigidly connected to the string of pump rods 10.

The packer 5 is made in the form of an elastic cuff, pressed from below by a perforated shank 11 when it is supported on the face 12, which is telescopically mounted on the outside of the bottom 13 of the pipe string 4 with limited upward movement. The bottom 13 is made in the form of a hollow stop, screwed onto the lower end of the pipe string 4.

The space 14 of the pipe string below the plunger pump 6 is directly communicated with the lower layer 2 through the holes 15 of the perforated shank 11 and the annular space 16 of the pipe string 4 below the packer 5.

The annular space 17 of the pipe string 4 above the packer 5 is communicated with the upper layer 1.

Installation works as follows.

Before starting the installation into operation, the installation of the installation in the well 3 is performed, as shown in the drawing.

To do this, the assembled installation is lowered into the well to support the perforated liner with the lower end to the bottom 12 of the well 3. Next, the pipe string 4 is unloaded to the bottom of the well 3, while the packer 5, made in the form of an elastic cuff, is compressed, expanding outward under the influence from below and on top, respectively, of the perforated shank 11 and the bottom 13 of the pipe string 4, made in the form of a hollow stop. The column of pipes 4 is completely unloaded to the bottom 12 of the well 3, while the packer 5 is hermetically pressed against the inner walls of the well 3, separating the annular spaces 16 and 17 of the pipe string 4.

After that, the upper end of the pipe string 4 with a flow line (not shown) is tied at the wellhead 3, and the annulus 17 above the packer 5 at the wellhead 3 is connected to the injection line (not shown).

After that, the installation is put into operation, while for the extraction of oil from the oil-bearing formation 2 from the wellhead, the piston 7 of the plunger pump 6, which is installed as part of the pipe string 4, is activated by means of the pump rod string 10. The piston 7 makes a limited return relative to the pipe string 4 translational movement. In the process of moving the piston 7 upward, oil is sucked from the oil reservoir 2 through the annulus 16 below the packer 5 and the holes 15 of the perforated liner 11 into the space 14 of the pipe string 4, while the valve 9 of the plunger pump 6 is closed.

Next, the pump rods 10 and the piston 7 of the plunger pump 6 rigidly connected to it move downward, while the valve 9 of the plunger pump 8 opens and the inner space 18 of the pipe string 4 is filled above the piston 7 through the inner space of the latter and its through longitudinal channels 8. B the further cycle of the submersible sucker-rod pump is repeated, with the filling of the inner space 18 of the pipe string 4 with oil above the piston 7 of the plunger pump 8 and when the oil level in the pipe string 4 is reached stya hole 3 takes place in the oil delivery flow line.

Thus, there is a process of oil production from oil reservoir 2, and at the same time, fluid (for example, wastewater) can be injected into the overlying reservoir 1 of well 3 along the injection line (not shown) from the wellhead 3 into the annulus 17 of the column pipes 4, as the filling of which the fluid is pumped into the reservoir 1 (depending on its injectivity and the set discharge pressure).

The proposed installation for pumping fluid into the upper reservoir and oil production from the lower reservoir has a simple design, in addition, the 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 reservoir and injection of fluid into another wellbore allows you to expand the functionality of the installation.

Claims (1)

Installation for pumping fluid into the upper reservoir and oil production from the lower reservoir, containing a pipe string with a packer installed between the layers, a pump, characterized in that the pump is plunger installed in the pipe string, and the space of the pipe string below the pump is directly communicated with the lower layer through the annular space of the pipe string below the packer, and the annular space of the pipe string above the packer with the upper layer, while the packer is made in the form of an elastic cuff, pressed from below by perforated xv when it rests on the bottom, which is telescopically mounted on the bottom of the pipe string with the possibility of limited upward movement.