Small molecule imbibition agent injection pump pry

Abstract

The utility model discloses a small-molecule imbibition agent injection pump skid, and relates to the technical field of tight oil reservoir exploitation. The bottom pry is provided with a centrifugal pump, a medicament storage box and a boosting injection mechanism, the boosting injection mechanism comprises a right valve body and a left valve body, the left side of the right valve body is in threaded sealing connection with the left valve body, the right side of the right valve body is connected with a centrifugal pump outlet through a pipeline, and a centrifugal pump inlet is connected with the medicament storage box through a pipeline. The small molecule imbibition agent injection device has the advantages that due to the fact that each one-way valve is sealed in a conical ring surface contact mode, when the one-way valves are opened and closed (compared with line contact sealing of ordinary steel ball type one-way valves), the shearing effect of the agent is reduced, injection work of the small molecule imbibition agent can be completed through a standard hydraulic cylinder and an ordinary centrifugal pump, and the injection efficiency is improved. The device is simple in structure, low in cost, capable of being hoisted and transported and suitable for different well mouths.

Description

Technical Field

[0001] The utility model relates to the technical field of tight oil reservoir exploitation, in particular to a small molecule imbibing agent injection pump skid. Background Art

[0002] The small molecule imbibition agent has an excellent spontaneous imbibition effect, thereby penetrating into the micro-nano pore throats of tight oil reservoirs and improving the spontaneous imbibition recovery rate of tight oil reservoirs. The small molecule imbibition agent is composed of isopropanolamide, isopentyl polyoxyethylene ether phosphate, 2-ethylhexyl alcohol benzene sulfonate and water.

[0003] At present, small molecule imbibing agents are generally injected into the formation at the wellhead using a high-pressure plunger pump. When a traditional plunger pump is used to inject small molecule imbibing agents, the inlet and outlet check valves of the plunger pump have a large shearing effect on the small molecule imbibing agents, resulting in a high degradation rate, which affects the imbibing effect. The use of a dedicated plunger pump increases costs and has high energy consumption. Utility Model Content

[0004] In order to solve the problem of high degradation rate of small molecule imbibing agent during injection, the utility model provides a small molecule imbibing agent injection pump skid.

[0005] The technical solution provided by the utility model is: a small molecule imbibition agent injection pump skid, including a bottom skid, a centrifugal pump, a medicine storage box and a boost injection mechanism are installed on the bottom skid, the boost injection mechanism includes a right valve body and a left valve body, the left side of the right valve body is threaded and sealed to the left valve body, the right side of the right valve body is provided with a pipeline connected to the centrifugal pump outlet, the centrifugal pump inlet is provided with a pipeline connected to the medicine storage box, a valve seat B and a valve head B are installed in the right valve body, a compression spring is provided between the valve seat B and the valve head B, the valve head B and the right valve body are sealed and connected through a conical ring surface, and the right valve body, the valve seat B, the valve head B and the compression spring form a one-way valve;

[0006] The left valve body is provided with a valve seat A and a valve head A, a compression spring is arranged between the valve seat A and the valve head A, the valve head A and the left valve body are connected by a conical ring seal, the left valve body, the valve seat A, the valve head A and the compression spring form a one-way valve, and the above structure enables the liquid to flow only from the right side to the left side in the boost injection mechanism;

[0007] The left valve body is connected to a cylinder sleeve on the right side of the valve head A. The piston is connected to the cylinder sleeve through a sealing ring gap. The outer side of the piston is fixedly connected to the plunger of the hydraulic cylinder. The hydraulic cylinder is fixedly connected to the left valve body, and the right valve body is fixedly connected to the bottom skid.

[0008] The hydraulic cylinder is a single-acting cylinder with a pressure relief pipe.

[0009] There is no check valve in the centrifugal pump outlet pipe.

[0010] The beneficial effects of the utility model are as follows: a boost injection mechanism is provided, and the function of two one-way valves is utilized so that a centrifugal pump with a small lift can deliver the agent into between the two one-way valves, and the hydraulic cylinder is started intermittently to inject the agent into the high-pressure manifold. Since each one-way valve adopts a conical annular contact seal, when the one-way valve is opened and closed (relative to the line contact seal of an ordinary steel ball one-way valve), the shearing effect of the agent is reduced, and the injection of small molecule imbibing agents can be completed using a standard hydraulic cylinder and an ordinary centrifugal pump. The utility model has a simple structure, low cost, and can be hoisted and transported to adapt to use at different wellheads. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Attached Figure 1 It is a structural schematic diagram of the utility model.

[0012] In the figure: 1- bottom skid, 2- centrifugal pump, 3- reagent storage box, 4- boost injection mechanism, 5- right valve body, 6- left valve body, 7- valve head A, 8- valve head B, 9- conical ring surface, 10- cylinder sleeve, 11- piston, 12- hydraulic cylinder, 13- valve seat A, 14- valve seat B. DETAILED DESCRIPTION

[0013] like Figure 1 As shown, a small molecule imbibition agent injection pump skid comprises a bottom skid 1, on which a centrifugal pump 2, a medicine storage box 3 and a boost injection mechanism 4 are installed, the boost injection mechanism 4 comprises a right valve body 5 and a left valve body 6, the left side of the right valve body 5 is threaded and sealed to the left valve body 6, the right side of the right valve body 5 is provided with a pipeline connected to the outlet of the centrifugal pump 2, the inlet of the centrifugal pump 2 is provided with a pipeline connected to the medicine storage box 3, a valve seat B14 and a valve head B8 are installed in the right valve body 5, a compression spring is provided between the valve seat B14 and the valve head B8, the valve head B8 and the right valve body 5 are sealed and connected via a conical ring surface 9, and the right valve body 5, the valve seat B14, the valve head B8 and the compression spring form a one-way valve;

[0014] A valve seat A13 and a valve head A7 are installed in the left valve body 6, a compression spring is arranged between the valve seat A13 and the valve head A7, the valve head A7 and the left valve body 6 are sealed and connected via a conical ring surface 9, the left valve body 6, the valve seat A13, the valve head A7 and the compression spring form a one-way valve, and the above structure enables the liquid to flow only from the right side to the left side in the boost injection mechanism 4;

[0015] The left valve body 6 is connected to a cylinder sleeve 10 on the right side of the valve head A7. The piston 11 is connected to the cylinder sleeve 10 through a sealing ring gap. The outer side of the piston 11 is fixedly connected to the plunger of the hydraulic cylinder 12. The hydraulic cylinder 12 is fixedly connected to the left valve body 6, and the right valve body 5 is fixedly connected to the bottom skid 1.

[0016] The hydraulic cylinder 12 is a single-acting cylinder and has a pressure relief pipe.

[0017] There is no one-way valve on the outlet pipe of the centrifugal pump 2. When the centrifugal pump 2 starts to transport the agent into the one-way valve of the right valve body 5, the lift of the centrifugal pump 2 is not enough to open the one-way valve of the left valve body 6. At this time, the centrifugal pump 2 is in an idling state and there is no need to stop the pump. At this time, the hydraulic cylinder 12 is actuated to push the piston 11 into the space between the two one-way valves. The hydraulic pressure pushes open the one-way valve of the left valve body 6 to inject the agent into the high-pressure manifold. The hydraulic cylinder 12 works intermittently. When the hydraulic cylinder 12 is depressurized, the centrifugal pump 2 continues to transport the agent into the space between the two one-way valves.

[0018] A boost injection mechanism 4 is provided, and the function of two one-way valves is utilized so that the centrifugal pump 2 with a small lift can deliver the agent into between the two one-way valves. The hydraulic cylinder 12 is started intermittently to inject the agent into the high-pressure manifold. Since each one-way valve adopts a conical annular surface 9 for contact sealing, when the one-way valve is opened and closed (relative to the line contact seal of an ordinary steel ball one-way valve), the shearing effect of the agent is reduced. The injection of small molecule imbibing agents can be completed using a standard hydraulic cylinder 12 and an ordinary centrifugal pump 2. The structure is simple, the cost is low, and the agent can be hoisted and transported to adapt to the use of different wellheads.

Claims

1. A small molecule imbibing agent injection pump skid, comprising a bottom skid (1), characterized in that: A centrifugal pump (2), a medicine storage box (3) and a boost injection mechanism (4) are installed on the bottom skid (1). The boost injection mechanism (4) comprises a right valve body (5) and a left valve body (6). The left side of the right valve body (5) is threadedly connected to the left valve body (6). The right side of the right valve body (5) is provided with a pipeline connected to the outlet of the centrifugal pump (2). The inlet of the centrifugal pump (2) is provided with a pipeline connected to the medicine storage box (3). A valve seat B (14) and a valve head B (8) are installed in the right valve body (5). A compression spring is provided between the valve seat B (14) and the valve head B (8). The valve head B (8) and the right valve body (5) are sealedly connected via a conical ring surface (9). The right valve body (5), the valve seat B (14), the valve head B (8) and the compression spring form a one-way valve. A valve seat A (13) and a valve head A (7) are installed in the left valve body (6), a compression spring is arranged between the valve seat A (13) and the valve head A (7), the valve head A (7) and the left valve body (6) are sealed by a conical ring surface (9), the left valve body (6), the valve seat A (13), the valve head A (7) and the compression spring form a one-way valve, and the above structure enables the liquid to flow only from the right side to the left side in the boost injection mechanism (4); The left valve body (6) is connected to a cylinder sleeve (10) on the right side of the valve head A (7). The cylinder sleeve (10) is connected to a piston (11) through a sealing ring clearance fit. The outer side of the piston (11) is fixedly connected to a plunger of a hydraulic cylinder (12). The hydraulic cylinder (12) is fixedly connected to the left valve body (6). The right valve body (5) is fixedly connected to the bottom skid (1).

2. A small molecule imbibing agent injection pump skid according to claim 1, characterized in that: The hydraulic cylinder (12) is a single-acting cylinder and has a pressure relief pipeline.

3. A small molecule imbibing agent injection pump skid according to claim 1, characterized in that: The outlet pipe of the centrifugal pump (2) is not provided with a check valve.

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