An intelligent injection device suitable for gas and water wheel injection

Abstract

The present invention relates to the technical field of downhole instruments in oil fields, and provides an intelligent injector suitable for gas-water rotary injection, comprising an air injection injector and a water injection injector, wherein the water injection injector and the air injection injector are independently connected in series, the air flow channel of the air injection injector being connected to the water flow channel of the water injection injector via a drainage pipe, a linkage valve being provided on the drainage pipe for controlling the flow direction of the water and gas injection media; the linkage valve being composed of a linkage valve core movably assembled in a linkage valve seat, the rear end of the linkage valve core being coaxially connected to and installed with a water injection valve core, the water injection valve core being installed at the end of the water injection valve in the water injection injector, the linkage valve seat having a connecting cavity at the top and bottom, the linkage valve core being movably sealed in the middle of the connecting cavity. The present invention enables precise control of the amount of injected water and the flow rate of injected carbon dioxide during the water-gas rotary injection process in the oil field, ensuring that the water flow and impurities mixed in the water do not enter the gas injection channel during water injection and block relevant functional components in the gas injection channel, thereby improving the long-term reliability of the instrument.

Description

Technical Field

[0001] The invention relates to an intelligent injector suitable for gas-water turbine injection, belonging to the technical field of oilfield downhole instruments. Background Art

[0002] Carbon dioxide (CO2) flooding offers numerous advantages over traditional waterflooding in oilfields. CO2 injected into oil reservoirs can significantly increase oil recovery through dissolution, acidification, expansion, and extraction. However, due to the difficulty in obtaining CO2 and the high requirements for injection equipment, CO2 flooding is significantly more expensive than waterflooding. To balance recovery effectiveness and production costs, oilfields typically employ an alternating system of waterflooding and CO2 flooding (referred to herein as "gas-water injection").

[0003] Due to the varying geological characteristics of underground oil reservoirs, the required injection volume of injection medium varies. To improve the effectiveness of oil recovery processes, precise control of the injection volume for each reservoir is essential. Oil fields typically install an equal number of intelligent injectors downhole for each reservoir, connected to the surface control system via cables. These intelligent injectors dynamically adjust the opening of the injection valves based on real-time flow measurements, thereby precisely controlling the injection volume of the recovery medium into each reservoir.

[0004] Due to the vastly different physical properties of water and CO2, as well as the significant differences in injection volumes, smart injectors for water and CO2 injection differ significantly in their flow measurement principles, flow channel size, and valve structure, making them incompatible. Furthermore, due to the extremely tight clearances between the valves controlling the CO2 injection volume and components such as the flow measurement, coupled with the poor quality and high impurity content of the water being injected downhole, the injected water and impurities can easily cause the relevant components of the gas injector to become blocked, impacting the subsequent normal operation of the gas injection function. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides an intelligent injector suitable for gas-water wheel injection. The intelligent injector suitable for gas-water wheel injection can realize precise control of the injected water volume and the injected carbon dioxide flow rate, and also ensure that the water flow and impurities mixed in the water will not enter the gas injection channel during water injection and block the relevant functional components in the gas injection channel.

[0006] The present invention is achieved through the following technical solutions.

[0007] The present invention provides an intelligent injector suitable for gas-water wheel injection, comprising an air injection dispenser and a water injection dispenser, wherein the water injection dispenser and the air injection dispenser are independently connected in series, and the air flow channel of the air injection dispenser is connected to the water flow channel of the water injection dispenser through a drainage pipe, and a linkage valve is provided on the drainage pipe for controlling the flow direction of the water injection and air injection media; the linkage valve is composed of a linkage valve core movably assembled in a linkage valve seat, and the rear end of the linkage valve core is coaxially connected to the water injection valve core, and the water injection valve core is installed at the end of the water injection valve in the water injection dispenser, and a connecting cavity is provided on the top and bottom of the linkage valve seat, and the linkage valve core is movably sealed in the middle of the connecting cavity.

[0008] A water injection valve is arranged on the pipeline connected to the linkage valve in the water injection dispenser, and the water injection valve is driven to move by a water injection motor assembly installed at the outer end of the water injection dispenser.

[0009] An air injection valve is arranged on a pipeline connected to the linkage valve in the air injection dispenser, and the air injection valve is driven to move by an air injection motor assembly installed near the inner end of the air injection dispenser.

[0010] The water injection outlet on the water injection dispenser is located at the top position between the water injection valve and the linkage valve.

[0011] The gas injection outlet on the gas injection dispenser is located at the top position between the linkage valve and the gas injection valve.

[0012] A one-way valve is installed at the gas injection outlet; the outlet of the one-way valve faces upward, and a ball is movable to block the outlet.

[0013] When the linkage valve core is at the distal end position of the linkage valve seat, the connecting cavity is blocked, and the bottom of the connecting cavity is connected to the end of the linkage valve seat and is connected to the position of the air injection valve via the drainage tube and the air flow channel; when the linkage valve core is at the proximal end position of the linkage valve seat, the linkage valve core blocks the opening of the end of the linkage valve seat, and the liquid inlet of the connecting cavity is connected to the water injection outlet of the water injection distributor.

[0014] A water flow channel is provided at the bottom of the water injection distributor, and a screen tube is provided at the inlet position of the outer end of the water flow channel.

[0015] The one-way valve is a cylindrical tube body, the inner end surface of the end opening is a slope structure matched with the ball, and the middle part of the side wall of the one-way valve is provided with an opening inclined upward, and the diameter of the opening is smaller than the diameter of the ball.

[0016] The beneficial effects of the present invention are: achieving precise control of the injected water volume and the injected carbon dioxide flow rate during the water-gas injection process in the oil field, ensuring that the water flow and impurities mixed in the water will not enter the gas injection channel during water injection and block the relevant functional components in the gas injection channel, thereby improving the long-term reliability of the instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1is a schematic structural diagram of at least one embodiment of the present invention;

[0018] Figure 2 yes Figure 1 Schematic diagram of the structure of the intermediate linkage valve;

[0019] Figure 3 When water is injected Figure 2 Schematic diagram of the working status of the intermediate linkage valve;

[0020] Figure 4 When gas is injected Figure 2 Schematic diagram of the working status of the intermediate linkage valve;

[0021] Figure 5 yes Figure 1 Schematic diagram of the working principle of the one-way valve.

[0022] In the figure: 1-screen tube, 2-water injection motor assembly, 3-water injection valve, 4-water flow channel, 5-linked valve, 6-drainage pipe, 7-air injection motor assembly, 8-check valve, 9-air flow channel, 10-air injection valve, 11-water injection valve core, 12-linked valve core, 13-linked valve seat. Implementation Method

[0023] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0024] The core concept of this invention lies in connecting a smart dispenser specifically for water injection (referred to as the water dispenser) and a smart dispenser specifically for carbon dioxide injection (referred to as the gas dispenser) in series. Both components contain complete circuit control modules, motor assemblies, valve assemblies, flow rate measurement components, and other functional components. The two functional components are independent of each other and communicate via a single-core connection. The detailed design of the two dispenser bodies is essentially the same as that of the smart dispenser for single-mode applications, so it will not be discussed in detail in this invention.

[0025] The first embodiment of the present invention relates to an intelligent dispenser suitable for gas and water injection, such as Figures 1 to 5 As shown, it includes an air injection dispenser and a water injection dispenser. The water injection dispenser and the air injection dispenser are independently connected in series. The air flow channel 9 of the air injection dispenser is connected to the water flow channel 4 of the water injection dispenser through a drainage pipe 6. There is a linkage valve 5 on the drainage pipe 6 for controlling the flow direction of the water injection and air injection media.

[0026] Thus, the air flow channel 9 of the gas injection dispenser is connected to the water flow channel 4 of the water injection dispenser through a drainage pipe 6 and then a linkage valve 5. Whether injecting water or gas, the injection medium enters through the screen pipe 1 through the water flow channel 4. The linkage valve 5 controls the flow of the water and gas injection media into their respective valve control mechanisms, thereby achieving precise control of the injected water volume and carbon dioxide flow rate during the water and gas rotation injection process in the oil field.

[0027] The second embodiment of the present invention is essentially the same as the first embodiment, primarily in that a water injection valve 3 is provided on the pipeline connecting the water injection dispenser to the linkage valve 5. This valve 3 is driven by a water injection motor assembly 2 mounted on the outer end of the water injection dispenser. This allows precise control of the amount of water injected through circuitry controlling the water injection motor assembly 2.

[0028] Preferably, the water injection outlet on the water injection dispenser is located at the top position between the water injection valve 3 and the linkage valve 5. This facilitates the control of the water injection valve 3 on the amount of water injected.

[0029] Furthermore, a gas injection valve 10 is installed on the pipeline connected to the linkage valve 5 in the gas injection dispenser. The gas injection valve 10 is driven by the gas injection motor assembly 7 installed at the inner end of the gas injection dispenser. Thus, the gas injection motor assembly 7 can be controlled by the circuit to achieve precise control of the amount of carbon dioxide injected.

[0030] Preferably, the gas injection outlet on the gas injection dispenser is located at the top position between the linkage valve 5 and the gas injection valve 10. This facilitates the control of the amount of carbon dioxide injected by the gas injection valve 10.

[0031] The third embodiment of the present invention is basically the same as the first embodiment, mainly in that the linkage valve 5 is composed of a linkage valve core 12 movably assembled in the linkage valve seat 13, the rear end of the linkage valve core 12 is coaxially connected to the water injection valve core 11, the water injection valve core 11 is installed at the end of the water injection valve 3 in the water injection dispenser, and there is a connecting cavity at the top and bottom of the linkage valve seat 13, and the linkage valve core 12 is movably sealed in the middle of the connecting cavity.

[0032] Preferably, when the linkage valve core 12 is at the distal position of the linkage valve seat 13, the connecting cavity is blocked, and the bottom of the connecting cavity is connected to the end of the linkage valve seat 13 and is connected to the position of the gas injection valve 10 via the drainage tube 6 and the air flow channel 9; when the linkage valve core 12 is at the proximal position of the linkage valve seat 13, the linkage valve core 12 blocks the opening of the end of the linkage valve seat 13, and the liquid inlet of the connecting cavity is connected to the water injection outlet of the water injection distributor.

[0033] Generally, the position where the two parts are relatively far away from the maximum limit is the distal end, and the position where they are relatively close to the minimum limit is the proximal end. Therefore, the distal position of the linkage valve core relative to the linkage valve seat is as follows: Figure 3 The linkage valve core and the linkage valve seat are relatively far apart, and the proximal position of the linkage valve core relative to the linkage valve seat is as shown. Figure 4 The linkage valve core and linkage valve seat are shown in a relatively close position.

[0034] After the water injection valve 3 is closed, the motor is controlled to continue moving the water injection valve core 11 and the linkage valve core 12 toward the right in the diagram, keeping the water injection valve closed. After moving a certain distance, a clearance is formed between the linkage valve core 12 and the linkage valve seat 13, and the linkage valve opens. The injected carbon dioxide enters the air flow channel 9 of the gas injection dispenser through the drainage tube 6. The amount of gas injected is then adjusted by controlling the opening of the gas injection valve 10 in the gas injection dispenser.

[0035] Furthermore, a water flow channel 4 is provided at the bottom of the water injection distributor, and a screen tube 1 is provided at the inlet position of the outer end of the water flow channel 4 .

[0036] The fourth embodiment of the present invention is essentially the same as the first embodiment, except that a one-way valve 8 is installed at the gas injection outlet. The outlet of the one-way valve 8 faces upward and is removably sealed by a ball. The one-way valve prevents the injected water and impurities from entering the gas injection channel through the gas injection outlet during the water injection process.

[0037] As a preferred solution for the one-way valve 8, the one-way valve 8 is a cylindrical tube body, the inner end surface of the end opening is a slope structure that matches the sphere, and there is an upward-slanted opening in the middle of the side wall of the one-way valve 8, and the diameter of the opening is smaller than the diameter of the sphere.

Claims

1. An intelligent injector suitable for gas and water turbine injection, including an air injection injector and a water injection injector, characterized in that: The water injection dispenser and the gas injection dispenser are connected in series independently. The air flow channel (9) of the gas injection dispenser is connected to the water flow channel (4) of the water injection dispenser through a drainage pipe (6). The drainage pipe (6) is provided with a linkage valve (5) for controlling the flow direction of the water injection and gas injection media. The linkage valve (5) is composed of a linkage valve core (12) movably assembled in a linkage valve seat (13). The rear end of the linkage valve core (12) is coaxially connected to the water injection valve core (11). The water injection valve core (11) is installed at the end of the water injection valve (3) in the water injection dispenser. A connecting cavity is provided in the linkage valve seat (13). The linkage valve core (12) is movably blocked in the middle of the connecting cavity. A water injection valve (3) is provided on the pipeline connected to the linkage valve (5) in the water injection dispenser. The water injection valve (3) is provided by The water injection dispenser is driven to move by a water injection motor assembly (2) installed at the outer end thereof; an air injection valve (10) is provided on a pipeline connected to the linkage valve (5) in the air injection dispenser, and the air injection valve (10) is driven to move by an air injection motor assembly (7) installed at the inner end thereof; when the linkage valve core (12) is at the distal end position of the linkage valve seat (13), the connecting cavity is blocked, and the bottom of the connecting cavity is connected to the end of the linkage valve seat (13) and is connected to the position of the air injection valve (10) via the drainage pipe (6) and the air flow channel (9); when the linkage valve core (12) is at the proximal end position of the linkage valve seat (13), the linkage valve core (12) blocks the opening of the end of the linkage valve seat (13), and the liquid inlet of the connecting cavity is connected to the water injection outlet of the water injection dispenser.

2. The intelligent dispenser for gas and water injection according to claim 1, characterized in that: The water injection outlet on the water injection dispenser is located at the top position between the water injection valve (3) and the linkage valve (5).

3. The intelligent dispenser for gas and water injection according to claim 1, characterized in that: The gas injection outlet on the gas injection dispenser is located at the top position between the linkage valve (5) and the gas injection valve (10).

4. The intelligent dispenser for gas and water injection according to claim 3, characterized in that: A one-way valve (8) is installed at the gas injection outlet; the outlet of the one-way valve (8) faces upward, and a movable sealing ball is installed at the gas injection outlet.

5. The intelligent dispenser for gas and water injection according to claim 1, characterized in that: A water flow channel (4) is provided at the bottom of the water injection dispenser, and a screen tube (1) is provided at the inlet position of the outer end of the water flow channel (4).

6. The intelligent dispenser for gas and water injection according to claim 4, characterized in that: The one-way valve (8) is a cylindrical tube body, the inner end surface of the end opening is a slope structure that matches the sphere, and the middle part of the side wall of the one-way valve (8) has an opening that is inclined upward, and the diameter of the opening is smaller than the diameter of the sphere.

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