CN115949383A - Positive displacement low-shear polymer injection device for polymer injection well and use method thereof - Google Patents
Positive displacement low-shear polymer injection device for polymer injection well and use method thereof Download PDFInfo
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- CN115949383A CN115949383A CN202111179917.9A CN202111179917A CN115949383A CN 115949383 A CN115949383 A CN 115949383A CN 202111179917 A CN202111179917 A CN 202111179917A CN 115949383 A CN115949383 A CN 115949383A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a positive displacement low shear polymer injection device for a polymer injection well and a using method thereof, the device comprises a first electric valve, a buffer device, a second electric valve, an energy accumulator and a third electric valve, a pipeline A is an input trunk line of polymer solution, an inlet and an outlet of the first electric valve are respectively connected with the pipeline A and the buffer device, an inlet and an outlet of the second electric valve are respectively connected with the buffer device and the energy accumulator, an inlet of the third electric valve is connected with the buffer device, an outlet connecting pipeline B is communicated with a wellhead device, and the buffer device and the energy accumulator indirectly regulate the speed of the polymer solution by regulating the flow of buffer liquid. The polymer injection well volumetric low-shear polymer injection device and the use method thereof can be used for the ground flow of the polymer injection well in an oil field, realize low-shear injection of a polymer solution from a trunk line to a well head, and have important significance for improving the viscosity retention rate of the polymer solution and improving the oil displacement effect.
Description
Technical Field
The invention relates to the technical field of ground distribution devices of polymer injection wells in oil fields, in particular to a volumetric low-shear polymer injection device of a polymer injection well and a using method thereof.
Background
The polymer flooding is a method for effectively improving the recovery ratio and is widely applied on site. The main principle is that the oil recovery rate is improved by increasing the viscosity of the injection liquid, improving the fluidity ratio and improving the displacement phase wave and area, so that the oil displacement effect is influenced to a great extent by the viscosity of the injection liquid. At present, the flow control device of polymer flooding low-shear ground mainly reduces the kinetic energy of fluid in an energy loss mode so as to reduce the damage of turbulence and mechanical shearing action on polymer molecular chains and realize low-shear flow control. The main problems of the existing method are that under the condition of large pressure difference, the molecular chain of the polymer is torn due to the too fast flow speed of the fluid, the retention rate of the solution viscosity is low, and the oil displacement effect is influenced.
In the application No.: CN98214357.5, which is a chinese patent application, relates to a cone valve type low shear flow controller, which comprises a valve body and a valve core, wherein the inner cavity wall of the valve body is in the shape of venturi tube, the valve body is provided with an inlet pipe, the upper end of the valve body is provided with a gland flange, a valve rod is arranged in the gland flange and the valve body static seal gland flange in series, the upper end of the valve rod is connected with an actuating mechanism, the lower end is linked with the valve core, and the valve core is in the shape of cone. The polymer flow rate regulating structure is one combination of Venturi tube reducing flow rate regulating principle and method and needle valve structure to form one conic flow rate controller comprising valve body and valve core.
In the application No.: CN201020579853.2, a chinese patent application relates to a low shear flow control valve, which comprises a valve body, an outlet stop cap, an adjusting ring, a right stop cap, an adjusting rod, a pressure cap, a first valve core, a second valve core, a third valve core, a fourth valve core, and a fifth valve core. The conical surface fit between the valve core and the adjusting rod are adopted to change the distance of the adjusting ring and the conical surface fit state between the valve core and the valve core so as to change the polymer inlet and outlet pressure difference. The retention rate of the polymer viscosity is more than 90 percent under the pressure difference of 3 Mpa.
In the application No.: CN201520023319.6, relating to a novel low-shear mother liquor flow controller for oil fields, wherein a static mixer consists of an outer shell (1) and a low-shear linear cone valve (2); the outer shell (1) contains a plurality of sealing parts, the low-shear shuttle cone valve (2) is inserted into the outer shell (1), and the center line of the low-shear shuttle cone valve (2) is superposed with the center line of the outer shell (1). The polymer mother liquor stably flows out from the outlet by the principle of radial rotation and diffusion of the fusiform cone valve, so that the mechanical shearing force of the conventional cone valve is avoided, and the polymer viscosity loss caused by a mother liquor flow controller is reduced.
In application No.: CN201520897670.8, a low shear polymer flow controller, which relates to a valve controller, comprises a valve body, a valve core and an electric valve, wherein the inner cavity of the valve body is in a venturi tube shape, the valve core is arranged in the valve body, the top end of the valve core is fixedly connected with a valve core pull rod, the top end of the valve core pull rod passes through a sealing upper cover connected with a screw rod at the top end of the valve body, the top end of the valve core pull rod is connected with an output rod of the electric valve through a connector, the middle of the valve core main body is a cylinder, and the top end of the cylinder is fixedly connected with the bottom surface of a cone i; the bottom of cylinder and the bottom surface fixed connection of cone II, the valve body bottom is equipped with the liquid outlet, and upper portion is equipped with the inlet. Connect the cone with original case top, increase the area of overflowing, reduce the velocity of flow, form the decompression storehouse simultaneously, very big reduction the viscosity loss.
The prior art is greatly different from the invention, and the technical problems which we want to solve are not solved, so we invent a novel polymer injection well volumetric low-shear polymer injection device and a use method thereof.
Disclosure of Invention
The invention aims to provide a polymer injection well volumetric low-shear polymer injection device and a using method thereof, wherein the polymer injection well volumetric low-shear polymer injection device can realize low-shear injection of a polymer solution from a trunk line to a well head, and has important significance for improving the viscosity retention rate of the polymer solution and improving the oil displacement effect.
The object of the invention can be achieved by the following technical measures: the positive displacement low-shear polymer injection device for the polymer injection well comprises a first electric valve, a buffer device, a second electric valve, an energy accumulator and a third electric valve, wherein a pipeline A is an input trunk line of polymer solution, an inlet and an outlet of the first electric valve are respectively connected with the pipeline A and the buffer device, an inlet and an outlet of the second electric valve are respectively connected with the buffer device and the energy accumulator, an inlet of the third electric valve is connected with the buffer device, an outlet connecting pipeline B leads to a wellhead device, and the buffer device and the energy accumulator indirectly regulate the speed of the polymer solution by regulating the flow of buffer liquid.
The object of the invention can also be achieved by the following technical measures:
the polymer injection well positive displacement low shear polymer injection device also comprises a time sequence module, wherein the time sequence module is connected with the first electric valve, the second electric valve and the third electric valve and controls the opening and closing sequence and the opening degree of the first electric valve, the second electric valve and the third electric valve.
The buffering device comprises a piston and a cylinder body, wherein the piston is arranged in the cylinder body and can reciprocate in the cylinder body, the initial position of the piston is located at the leftmost side of the cylinder body, and hydraulic oil is filled in a cavity on the right side of the piston in advance.
The accumulator comprises an air bag and a shell, wherein the air bag is positioned in the shell, and the pressure intensity in the air bag can be adjusted through a top end valve.
When polymer solution enters the polymer injection well volumetric low-shear polymer injection device from a main line A, the timing sequence module controls the first electric valve to open, keeps the third electric valve closed, and controls the opening of the second electric valve to enable the polymer solution to slowly enter the buffer device, wherein the piston is positioned at the leftmost end.
And when the piston reaches the rightmost side, the timing module closes the first electric valve and opens the third electric valve.
Because the pressure of the well head is less than the main line pressure, the air bag expands, the hydraulic oil is pressed back into the buffer device, and the piston is pushed to move leftwards; the time sequence module controls the opening of the second electric valve to control the movement speed of the piston, so that the piston slowly pushes the polymer solution to flow out of the buffer device and enter the polymer injection well through a pipeline B.
After the piston returns to the leftmost end, the timing module closes the third electric valve and opens the first electric valve, so that the polymer solution flows into the device again from the main line.
The object of the invention can also be achieved by the following technical measures: the volumetric low-shear polymer injection method for the polymer injection well is characterized in that a volumetric low-shear polymer injection device for the polymer injection well is adopted, and the method comprises the following steps:
step 1, polymer solution enters the volumetric low-shear polymer injection device of the polymer injection well from a main line A, a timing module controls a first electric valve to be opened and keeps a third electric valve to be closed, a piston of a buffer device is positioned at the leftmost end at the moment, and the timing module controls the opening of a second electric valve to enable the polymer solution to slowly enter the buffer device;
step 2, pushing the piston to move rightwards along with the liquid entering the buffer device, enabling hydraulic oil on the right side of the piston to enter the energy accumulator and compress an air bag of the energy accumulator, and after the piston reaches the rightmost side, closing the first electric valve and opening the third electric valve by the timing sequence module;
step 3, because the pressure of the well mouth is smaller than the pressure of the main line, the air bag expands, the hydraulic oil is pressed back into the buffer device, and the piston is pushed to move leftwards; the time sequence module controls the opening of the second electric valve to control the movement speed of the piston, so that the piston slowly pushes the polymer solution to flow out of the buffer device and enter the polymer injection well through a pipeline B;
and 4, after the piston returns to the leftmost end, closing the third electric valve by the timing module, and opening the first electric valve to enable the polymer solution to flow into the device again from the trunk line.
The volumetric low-shear polymer injection device for the polymer injection well and the use method thereof have the advantages that the volumetric device is applied to a polymer ground flow control system for the first time, and the polymer low-shear injection is realized in an energy conversion mode; and a buffer device and an energy accumulator are arranged, and the speed of the polymer liquid is indirectly regulated by regulating the flow of the buffer liquid. The invention can be mainly used for the ground flow of the polymer injection well in the oil field, realizes the low-shear injection of the polymer solution from the trunk line to the well mouth, and has important significance for improving the viscosity retention rate of the polymer solution and improving the oil displacement effect.
Drawings
FIG. 1 is a block diagram of one embodiment of a positive displacement low shear polymer injection apparatus for polymer injection wells of the present invention.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, and/or combinations thereof, unless the context clearly indicates otherwise.
The invention discloses a volumetric low-shear polymer injection device, which aims to solve the problem of low viscosity retention rate of a polymer ground flow control device under a large pressure difference. Mainly comprises three electric valves, a buffer device, an energy accumulator and the like. The electric valve adopts electric power to control the opening and closing and the opening degree, and controls the opening and closing sequence and time through a time sequence module. The buffer device is composed of a cylinder body, a piston and the like, the piston reciprocates in the cylinder body, a position sensor is arranged in the cylinder body, and the flow of the polymer solution can be obtained through measured piston position data. The accumulator mainly comprises a shell, an air bag and the like. The three electric valves are respectively arranged between the trunk line and the inlet of the buffer device, between the buffer device and the energy accumulator, and between the outlet of the buffer device and the wellhead.
The sequence and the opening degree of the electric valve are controlled by the time sequence module, so that the polymer solution can enter the buffer device at a non-shearing speed and charge the energy accumulator. The sequence and the opening degree of the electric valve are controlled again through the time sequence module, so that the polymer solution can flow out of the injection well of the buffer device at a shear-free speed, the low-shear injection of the polymer solution is realized, and meanwhile, the flow rate of the polymer solution can be controlled by controlling the volume of the solution entering the buffer device.
A buffer device and an energy accumulator are arranged, and low-shear injection is realized in an energy conversion mode. By controlling the opening and closing sequence and opening of the electric valve, the polymer solution can enter the buffer device at a shear-free speed, and the energy accumulator is charged. The polymer solution can flow out of the buffer device and enter the well at a shear-free speed by controlling the opening and closing sequence and the opening degree of the electric valve again, so that the low-shear injection of the polymer solution is realized, and meanwhile, the flow rate of the polymer solution can be controlled by controlling the volume of the solution entering the buffer device.
The following are several specific examples to which the present invention may be applied.
Example 1
The device comprises a first electric valve 1, a buffer device 2, a second electric valve 3, an energy accumulator 4, a third electric valve 5, a time sequence module 6 and the like. Line a is the input trunk for the polymer solution. The inlet and outlet of the electric valve 1 are respectively connected with the pipeline A and the buffer device 2, the opening and closing states of the electric valve are controlled by electric power, and the electric valve is connected with a 6-time sequence device through an electric wire. The damper 2 includes a piston 21 and a cylinder 22. The piston 21 is installed in the cylinder 22 and can reciprocate in the cylinder 22, the initial position of the piston 21 is located at the leftmost side of the cylinder 22, and the cavity on the right side of the piston is filled with hydraulic oil in advance. The inlet and outlet of the second electric valve 3 are respectively connected with the buffer device 2 and the energy accumulator 4, the opening and closing state and the opening degree of the second electric valve are controlled by electric power, and the second electric valve is connected with the 6 time sequence device through electric wires. The accumulator 4 includes an airbag 41 and a case 42. The pressure in the bladder 41 can be regulated by a top valve. The inlet of the third electric valve 5 is connected with the buffer device 2, the outlet connecting pipeline B leads to the wellhead device, the opening and closing states of the third electric valve are controlled by electric power, and the third electric valve is connected with the 6 time sequence device through an electric wire.
Example 2
The using method of the device comprises the steps that the polymer solution enters the device from the trunk line A, the time sequence module controls the electric valve 1 to be opened, the third electric valve 5 is kept closed, the piston 21 is located at the leftmost end, and the opening degree of the second electric valve 3 is controlled to enable the polymer solution to slowly enter the buffer device 2. When the piston is pushed to the right as the liquid enters the buffer device, the hydraulic oil on the right side of the piston enters the accumulator 4 and compresses the air bag 41. When the piston 21 reaches the rightmost side, the timing module 6 closes the first electric valve 1 and opens the third electric valve 5. Since the wellhead pressure is less than the rail pressure, the bladder 41 of the accumulator 4 expands, pressing hydraulic oil back into the damping device 2 and pushing the piston 21 to move to the left. The movement speed of the piston 21 can be controlled by controlling the opening of the electric valve 2 through the timing module 6, so that the piston 21 slowly pushes the polymer solution to flow out of the buffer device 2 and enter the polymer injection well through the pipeline B. After the piston returns to the leftmost end, the third electric valve is closed, and the first electric valve is opened, so that the polymer solution flows into the device again from the main line.
In the working process of the device, the first electric valve 1 and the third electric valve 5 are always kept in a fully open or fully closed state, so that the mechanical shearing caused by the sudden change of the inner diameter when the polymer solution flows through the valves is effectively avoided, and the viscosity retention rate is improved. The movement speed of the piston 21 can be controlled by controlling the opening of the second electric valve 3, namely, the polymer solution is always controlled to flow into or out of the device at a lower speed, so that the conditions that the molecular chain of the polymer solution is torn and the viscosity is reduced due to the overhigh flow speed are avoided. Through the design of the two aspects, the viscosity retention rate of the polymer solution is greatly improved, and the low-shear injection of the polymer is realized.
Example 3:
in embodiment 3 to which the present invention is applied, the valves 1 and 5 may also be pneumatic ball valves, which are relatively fast in execution speed, and can reduce the opening and closing time of the ball valves, further reduce the shearing action on the polymer during the opening and closing processes, and improve the viscosity retention rate.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
In addition to the technical features described in the specification, the technology is known to those skilled in the art.
Claims (9)
1. The volumetric low-shear polymer injection device for the polymer injection well is characterized by comprising a first electric valve, a buffer device, a second electric valve, an energy accumulator and a third electric valve, wherein a pipeline A is an input trunk line of polymer solution, an inlet and an outlet of the first electric valve are respectively connected with the pipeline A and the buffer device, an inlet and an outlet of the second electric valve are respectively connected with the buffer device and the energy accumulator, an inlet of the third electric valve is connected with the buffer device, an outlet connecting pipeline B leads to a wellhead device, and the buffer device and the energy accumulator indirectly adjust the speed of polymer liquid by adjusting the flow of buffer liquid.
2. The apparatus of claim 1, further comprising a timing module connected to the first, second and third electrically operated valves for controlling the opening and closing sequence and opening of the first, second and third electrically operated valves.
3. The positive displacement low shear polymer injection apparatus for polymer injection wells of claim 2, wherein the damping means comprises a piston and a cylinder, the piston is mounted inside the cylinder for reciprocating movement within the cylinder, the piston is initially positioned at the left-most side of the cylinder, and the chamber at the right side of the piston is filled with hydraulic fluid in advance.
4. The polymer injection well positive displacement low shear polymer injection apparatus of claim 3, wherein the accumulator comprises a bladder and a housing, the bladder being located in the housing, the pressure level in the bladder being adjustable by a top valve.
5. The positive displacement low shear polymer injection system of claim 4, wherein the timing module controls the first electrically operated valve to open when polymer solution enters the positive displacement low shear polymer injection system from the main line A, and keeps the third electrically operated valve closed when the piston is at the leftmost end, and controls the second electrically operated valve to open to allow polymer solution to slowly enter the buffer device.
6. The positive displacement low shear polymer injection system of claim 5, wherein as fluid enters the buffer device, the piston is pushed to move to the right, hydraulic oil on the right side of the piston enters the accumulator and compresses the bladder, and when the piston reaches the right-most side, the timing module closes the first electrically operated valve and opens the third electrically operated valve.
7. The positive displacement low shear polymer injection system of claim 6, wherein the bladder expands to force hydraulic oil back into the buffer and push the piston to the left due to wellhead pressure being less than the rail pressure; the time sequence module controls the opening of the second electric valve to control the movement speed of the piston, so that the piston slowly pushes the polymer solution to flow out of the buffer device and enter the polymer injection well through a pipeline B.
8. The polymer injection well positive displacement low shear polymer injection device of claim 7, wherein after the piston returns to the far left end, the timing module closes the third electrically operated valve and opens the first electrically operated valve to allow polymer solution to flow from the main line into the device again.
9. The volumetric low-shear polymer injection method for polymer injection wells, which is characterized by using the volumetric low-shear polymer injection device for polymer injection wells according to claim 1, comprising:
step 1, polymer solution enters the volumetric low-shear polymer injection device of the polymer injection well from a main line A, a timing module controls a first electric valve to be opened and keeps a third electric valve to be closed, a piston of a buffer device is positioned at the leftmost end at the moment, and the timing module controls the opening of a second electric valve to enable the polymer solution to slowly enter the buffer device;
step 2, pushing the piston to move rightwards along with the liquid entering the buffer device, enabling hydraulic oil on the right side of the piston to enter the energy accumulator and compress an air bag of the energy accumulator, and after the piston reaches the rightmost side, closing the first electric valve and opening the third electric valve by the timing sequence module;
step 3, because the pressure of the well mouth is smaller than the pressure of the main line, the air bag expands, the hydraulic oil is pressed back into the buffer device, and the piston is pushed to move leftwards; the time sequence module controls the opening of the second electric valve to control the movement speed of the piston, so that the piston slowly pushes the polymer solution to flow out of the buffer device and enter the polymer injection well through a pipeline B;
and 4, after the piston returns to the leftmost end, closing the third electric valve and opening the first electric valve by the time sequence module so that the polymer solution flows into the device again from the main line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111179917.9A CN115949383A (en) | 2021-10-09 | 2021-10-09 | Positive displacement low-shear polymer injection device for polymer injection well and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111179917.9A CN115949383A (en) | 2021-10-09 | 2021-10-09 | Positive displacement low-shear polymer injection device for polymer injection well and use method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN115949383A true CN115949383A (en) | 2023-04-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111179917.9A Pending CN115949383A (en) | 2021-10-09 | 2021-10-09 | Positive displacement low-shear polymer injection device for polymer injection well and use method thereof |
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| CN (1) | CN115949383A (en) |
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2021
- 2021-10-09 CN CN202111179917.9A patent/CN115949383A/en active Pending
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