An injection device for carbon dioxide flooding

Abstract

The utility model discloses an injection device for carbon dioxide oil displacement, including chassis, pressure tank, carbon dioxide inlet pipe and two groups of compensation column cavity shell, the pressure tank fixed mounting is to the chassis, two groups the one end of compensation column cavity shell all is connected to the pressure tank through one -way compensation exhaust pipe, the pressure tank is connected with injection pump head through pipeline, the outside installation of pressure tank has controller, the end of carbon dioxide inlet pipe is equipped with the four -way pipe head, one pipe head of four -way pipe head is connected to the pressure tank through pipe one -way inlet pipe, two pipe heads of four -way pipe head are connected to two compensation column cavity shell respectively through one -way compensation inlet pipe, and the sliding plug in the compensation column cavity of compensation column cavity shell is equipped with the compensation plug. Advantageous effect lies in the stability of carbon dioxide whole injection oil displacement process is realized through the compensation power structure cooperation pressure tank, reduces the unstable flow and the injection instability situation caused by the storage tank storage capacity change.

Description

Technical Field

[0001] This utility model relates to the field of injection devices for oil displacement, and in particular to an injection device for carbon dioxide displacement. Background Technology

[0002] Carbon dioxide flooding (CCF) is a technology that injects carbon dioxide into oil reservoirs to improve oil recovery rates. By mixing carbon dioxide with the formation crude oil, it can effectively drive the formation crude oil to production wells. At present, CCF has greater advantages than water flooding and is more widely used. Carbon dioxide is supplied through carbon dioxide storage tanks. However, as the amount of carbon dioxide in the storage tank changes, the injection of CCF using a single pump is not stable. Utility Model Content

[0003] The purpose of this invention is to provide an injection device for carbon dioxide flooding in order to solve the above-mentioned problems.

[0004] This utility model achieves the above objectives through the following technical solutions:

[0005] An injection device for carbon dioxide-driven oil recovery includes a base frame, a pressure stabilizing tank, a carbon dioxide inlet pipe, and two sets of compensating column housings. The pressure stabilizing tank is fixedly mounted on the base frame. One end of each of the two sets of compensating column housings is connected to the pressure stabilizing tank via a one-way compensating manifold. The pressure stabilizing tank is connected to an injection pump head via a pipe. A controller is installed on the outside of the pressure stabilizing tank. A four-way connector is installed at the end of the carbon dioxide inlet pipe. One end of the four-way connector is connected to the pressure stabilizing tank via a one-way inlet pipe. The other two ends of the four-way connector are respectively connected to the two compensating column housings via one-way compensating inlet pipes. A compensating plug is provided in the compensating column housing by a sliding plug. A compensating cylinder is fixedly mounted on one end of the compensating column housing. The piston rod end of the compensating cylinder extends into the compensating column housing and is connected to the compensating plug.

[0006] Furthermore, a pressure sensor is installed inside the pressure stabilizing tank, and the pressure sensor is communicatively connected to the controller.

[0007] Furthermore, one-way valves are installed on the one-way compensation inlet pipe, the one-way tank inlet pipe, and the one-way compensation outlet pipe.

[0008] Furthermore, a pump head drive unit is mounted on the base frame, and the pump head drive unit is connected to the injection pump head.

[0009] Furthermore, an injection pipe is installed at the outlet of the injection pump head, and flanges are installed at both the end of the injection pipe and the inlet of the carbon dioxide inlet pipe.

[0010] Furthermore, a lifting frame is installed on the base frame.

[0011] Furthermore, a flow meter is installed on the carbon dioxide inlet pipe.

[0012] Furthermore, a balance hole is provided on the side of the compensation cylinder near the compensation cylinder in the compensation column cavity.

[0013] Furthermore, the compensation column cavity shell is fixedly installed onto the base frame via a compensation bracket.

[0014] The beneficial effects are as follows: The injection device for carbon dioxide flooding described in this utility model achieves stability of the entire carbon dioxide injection flooding process through a compensating power structure and a pressure stabilizing tank, reducing the instability of flow rate and injection caused by changes in the storage tank volume. Attached Figure Description

[0015] Figure 1 This is a structural diagram of an injection device for carbon dioxide flooding according to the present invention;

[0016] Figure 2 This is a schematic diagram of the interior of the compensation column cavity shell of the injection device for carbon dioxide flooding described in this utility model.

[0017] The annotations in the attached figures are explained as follows:

[0018] 1. Base frame; 2. Pressure stabilizing tank; 3. Injection pump head; 4. Pump head drive unit; 5. Injection pipe; 6. Carbon dioxide inlet pipe; 7. Flow meter; 8. Four-way pipe head; 9. One-way compensation inlet pipe; 10. Tank one-way inlet pipe; 11. Controller; 12. Compensation column cavity shell; 13. Compensation frame; 14. Compensation cylinder; 15. Flange; 16. Lifting frame; 17. Balance hole; 18. Compensation plug; 19. One-way compensation pipe; 20. Compensation column cavity. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings:

[0020] like Figures 1-2 As shown, an injection device for carbon dioxide flooding consists of a base frame 1, a pressure stabilizing tank 2, a carbon dioxide inlet pipe 6, and two sets of compensating column cavity shells 12.

[0021] The pressure stabilizing tank 2 is fixedly installed on the base frame 1. One end of each of the two sets of compensation column shells 12 is connected to the pressure stabilizing tank 2 through a one-way compensation pipe 19. The pressure stabilizing tank 2 is connected to the injection pump head 3 through a pipeline, which is the main power structure for injecting liquid carbon dioxide downhole. A controller 11 is installed on the outside of the pressure stabilizing tank 2.

[0022] The end of the carbon dioxide inlet pipe 6 is equipped with a four-way pipe head 8, which is a one-inlet and three-outlet pipe head. One end of the four-way pipe head 8 is connected to the pressure stabilizing tank 2 through the tank one-way inlet pipe 10, and the other two ends of the four-way pipe head 8 are connected to the two compensation column shells 12 respectively through the one-way compensation inlet pipe 9.

[0023] The compensation cylinder 12 has a compensation plug 18 in the compensation cylinder cavity 20 of the compensation cylinder cavity shell 12. A compensation cylinder 14 is fixedly installed on one end of the compensation cylinder cavity shell 12. The piston rod end of the compensation cylinder 14 extends into the compensation cylinder cavity 20 and is connected to the compensation plug 18.

[0024] like Figures 1-2 As shown, this utility model also discloses the following more optimized specific structures:

[0025] A pressure sensor is installed inside the pressure stabilizing tank 2. The pressure sensor is connected to the controller 11 to facilitate feedback of the pressure inside the tank.

[0026] One-way valves are installed on the one-way compensation inlet pipe 9, the one-way tank inlet pipe 10, and the one-way compensation outlet pipe 19.

[0027] A pump head drive unit 4 is installed on the base frame 1. The pump head drive unit 4 is connected to the injection pump head 3 and drives the pump head 3 to run.

[0028] An injection pipe 5 is installed at the outlet of the injection pump head 3, and flanges 15 are installed at the end of the injection pipe 5 and the inlet of the carbon dioxide inlet pipe 6.

[0029] A lifting frame 16 is installed on the base frame 1 to facilitate the overall lifting and movement.

[0030] A flow meter 7 is installed on the carbon dioxide inlet pipe 6 to monitor the flow rate.

[0031] A balance hole 17 is provided on the side of the compensation cylinder 14 near the compensation cylinder 20 to facilitate the balance of gas in and out.

[0032] The compensation column cavity shell 12 is fixedly installed on the base frame 1 via the compensation bracket 13.

[0033] like Figures 1-2The injection device for carbon dioxide flooding shown is moved to the injection port by the lifting frame 16 and the lifting equipment, and is connected to the carbon dioxide storage tank and the injection end through the flange 15. At the beginning, the pressure in the storage tank is relatively high, and the compensation cylinder 14 is not activated. Carbon dioxide is introduced into the pressure stabilizing tank 2 through the tank one-way inlet pipe 10 and injected into the wellbore through the injection pump head 3. As the storage tank decreases, its flow rate gradually becomes insufficient, and the pressure in the pressure stabilizing tank 2 decreases. At this time, the compensation cylinder 14 is activated, and the carbon dioxide in the storage tank enters the pressure stabilizing tank 2 through negative pressure suction and discharge, so that the carbon dioxide in the pressure stabilizing tank 2 is at a quantitative level, and the flow rate detected by the flow meter 7 is stable. At this time, the injection pump head 3 can be continuously and stably supplied to carry out the carbon dioxide injection operation.

[0034] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of this utility model as claimed.

Claims

1. An injection device for carbon dioxide flooding, characterized in that: The device includes a base frame, a pressure stabilizing tank, a carbon dioxide inlet pipe, and two sets of compensating column housings. The pressure stabilizing tank is fixedly mounted on the base frame. One end of each set of compensating column housings is connected to the pressure stabilizing tank via a one-way compensating pipe. The pressure stabilizing tank is connected to an injection pump head via a pipe. A controller is installed on the outside of the pressure stabilizing tank. A four-way connector is installed at the end of the carbon dioxide inlet pipe. One end of the four-way connector is connected to the pressure stabilizing tank via a one-way inlet pipe. The two ends of the four-way connector are respectively connected to the two compensating column housings via one-way compensating inlet pipes. A compensating plug is provided in the sliding plug inside the compensating column housing. A compensating cylinder is fixedly mounted on one end of the compensating column housing. The piston rod end of the compensating cylinder extends into the compensating column housing and is connected to the compensating plug.

2. The injection device for carbon dioxide flooding according to claim 1, characterized in that: A pressure sensor is installed inside the pressure stabilizing tank, and the pressure sensor is communicatively connected to the controller.

3. The injection device for carbon dioxide flooding according to claim 1, characterized in that: One-way valves are installed on the one-way compensation inlet pipe, the one-way tank inlet pipe, and the one-way compensation outlet pipe.

4. The injection device for carbon dioxide flooding according to claim 1, characterized in that: A pump head drive unit is mounted on the base frame, and the pump head drive unit is connected to the injection pump head.

5. An injection device for carbon dioxide flooding according to claim 1, characterized in that: An injection pipe is installed at the outlet of the injection pump head, and flanges are installed at both the end of the injection pipe and the inlet of the carbon dioxide inlet pipe.

6. An injection device for carbon dioxide flooding according to claim 1, characterized in that: A lifting frame is installed on the base frame.

7. An injection device for carbon dioxide flooding according to claim 1, characterized in that: A flow meter is installed on the carbon dioxide inlet pipe.

8. An injection device for carbon dioxide flooding according to claim 1, characterized in that: A balance hole is provided on the side of the compensation cylinder near the compensation cylinder in the compensation column cavity.

9. An injection device for carbon dioxide flooding according to claim 1, characterized in that: The compensation column cavity shell is fixedly installed onto the base frame via a compensation bracket.

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