Surface pipeline connecting method for pumping temporary plugging agent without stopping pump during fracturing

Abstract

The invention discloses a ground pipeline connection method for pumping a temporary plugging agent without pump interruption during fracturing, and particularly relates to the field of reservoir renovation, a temporary plugging agent skid-mounted tank is connected with a pump truck A and a temporary plugging agent pumping cylinder, a valve 2 is mounted on a pipeline connected between the temporary plugging agent skid-mounted tank and the temporary plugging agent pumping cylinder, and a valve 3 is mounted on the valve 2. A valve 1 is installed on a pipeline connected between the pump truck A and the temporary plugging agent pump injection cylinder, the temporary plugging agent pump injection cylinder is connected with a square hole liquid tank and a well mouth, a fracturing pump truck unit is installed on the well mouth in a matched mode, and a valve 4 is installed on a pipeline connected between the temporary plugging agent pump injection cylinder and the emptying liquid tank. And a valve 3 is arranged on the pipeline connected between the temporary plugging agent pumping cylinder and the wellhead. According to the method, the temporary plugging agent conveying pipeline is transformed for the pump in fracturing connection with the horizontal well, and the temporary plugging agent can be pumped efficiently and reliably without stopping the pump, so that a fractured crack is prevented from being closed again, and the temporary plugging effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of reservoir stimulation, and more specifically, to a method for connecting surface pipelines for pumping temporary plugging agents without stopping the pump during fracturing. Background Art

[0002] In order to solve the problems of strong heterogeneity of the reservoir in the long horizontal section, low efficiency of segmented fracturing, multi-cluster general initiation, and difficulty in achieving uniform distribution of hydraulic fractures, during the fracturing stimulation process, the means of dynamically plugging by pumping temporary plugging agents is often used to improve the initiation effectiveness of multi-cluster fractures, so as to achieve uniform fracture distribution in the entire long horizontal section and achieve the purpose of increasing the single-well production of horizontal wells. However, in the conventional pumping of temporary plugging agents, after the previous stage of fracturing construction is completed, the fracturing unit stops the pump and shuts down the well. The temporary plugging agent is pumped into the surface high-pressure pipeline through the temporary plugging agent skid-mounted unit, and then the fracturing unit is restarted to pump the temporary plugging agent. Due to the long pump stop time, the already fractured fractures will inevitably re-close, greatly affecting the temporary plugging effect. Therefore, a method for connecting surface pipelines for pumping temporary plugging agents without stopping the pump during fracturing is proposed. Summary of the Invention

[0003] The purpose of the present invention is to design a surface pipeline connection method for pumping temporary plugging agents without stopping the pump, efficiently and reliably, aiming at the problem of poor temporary plugging effect of temporary plugging agents due to the need to stop the pump for pumping temporary plugging agents in the existing horizontal well fracturing stimulation, so as to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A surface pipeline connection device for pumping temporary plugging agents without stopping the pump during fracturing, including a temporary plugging agent skid-mounted tank, the temporary plugging agent skid-mounted tank is connected to a pump truck A and a temporary plugging agent injection cylinder. A valve 2 is installed on the pipeline connecting the temporary plugging agent skid-mounted tank and the temporary plugging agent injection cylinder, and a valve 1 is installed on the pipeline connecting the pump truck A and the temporary plugging agent injection cylinder. The temporary plugging agent injection cylinder is connected to a square-hole liquid tank and a wellhead, and a fracturing pump truck unit is installed in cooperation with the wellhead.

[0005] Preferably, a valve 4 is installed on the pipeline connecting the temporary plugging agent injection cylinder and the drain liquid tank, and a valve 3 is installed on the pipeline connecting the temporary plugging agent injection cylinder and the wellhead.

[0006] Preferably, a valve 5 is installed on the pipeline connecting the wellhead and the fracturing pump unit.

[0007] Preferably, the temporary plugging agent skid-mounted tank, where the temporary plugging agent is mixed and added and then transported to the temporary plugging agent injection cylinder;

[0008] The temporary plugging agent injection cylinder, both ends of the cylinder body are respectively connected to the high-pressure pipeline, and the temporary plugging agent injection cylinder mainly plays the role of temporarily storing the temporary plugging agent;

[0009] For pump truck A, after the temporary plugging agent enters the pumping cylinder, the temporary plugging agent is pumped into the high-pressure wellbore.

[0010] The drain liquid tank temporarily stores the drained liquid in the pumping cylinder when the temporary plugging agent is transported by the skid-mounted pump of the temporary plugging agent.

[0011] Preferably, it further includes a method for connecting ground pipelines. The specific steps are as follows:

[0012] S1: Use the skid-mounted tank of the temporary plugging agent to mix and pump the temporary plugging agents with different particle sizes.

[0013] S2: Connect the skid-mounted tank of the temporary plugging agent to the pumping cylinder of the temporary plugging agent, and install valve 2 on the connected pipeline.

[0014] S3: Then connect pump truck A to the skid-mounted tank of the temporary plugging agent and the pumping cylinder of the temporary plugging agent together, and install valve 1 on the connected pipeline. Pump truck A can provide the minimum displacement to transport the temporary plugging agent in the pumping cylinder into the high-pressure wellbore.

[0015] S4: Connect the pumping cylinder of the temporary plugging agent to the corresponding horizontal well, and install valve 3 on the connected pipeline.

[0016] S5: Connect the drain liquid tank to the pipeline connecting the horizontal well of the pumping cylinder of the temporary plugging agent, and install valve 4 on the pipeline connected to the drain liquid tank.

[0017] S6: Cooperatively connect a fracturing pump truck unit on the horizontal well, and install valve 5 on the pipeline connected to the fracturing pump truck unit.

[0018] Preferably, the volume of the pumping cylinder of the temporary plugging agent is larger than the added volume of the temporary plugging agent, and its compressive strength is not lower than the strength of the ground high-pressure pipe manifold.

[0019] Preferably, the volume of the drain liquid tank meets the volume of the liquid discharged due to pumping of all the temporary plugging agents for one horizontal well.

[0020] Preferably, it further includes the working process of the method for connecting the ground pipeline for pumping the temporary plugging agent without stopping the pump. The process is as follows:

[0021] a: Close valve 3, open valve 5, and start the fracturing unit to complete the pre-temporary plugging fracturing construction.

[0022] b: After the first-stage fracturing is completed, the fracturing unit does not stop pumping, continues to pump fracturing fluid to keep the fracture in an open state, and record the pipeline pumping pressure P1.

[0023] c: Close valve 1, open valve 2 and valve 4, start the skid-mounted device of the temporary plugging agent, and slowly inject the mixed temporary plugging agents with different particle sizes into the pumping cylinder of the temporary plugging agent.

[0024] d: Close valve 2 and valve 4; open valve 1, start pump truck A, and increase the pressure in the temporary plugging agent injection cylinder to P2 at a displacement rate lower than 0.5 m³ / min, with the requirement that P2 is slightly greater than P1.

[0025] e: Slowly open valve 3. After it is fully opened, increase the displacement rate of pump truck A, pump all the temporary plugging agent into the wellbore, quickly close valve 3, and then stop pump truck A.

[0026] f: The fracturing unit increases the displacement rate and pumps the temporary plugging agent in the wellbore to the fracture orifice to complete the temporary plugging operation without stopping the pump.

[0027] Advantages of the present invention:

[0028] A method for connecting surface pipelines for pumping temporary plugging agent without stopping the pump in fracturing provided by the present invention. The temporary plugging agent is mixed and added from the temporary plugging agent skid-mounted tank and transported to the temporary plugging agent injection cylinder, which temporarily stores the temporary plugging agent. After the temporary plugging agent of the pump truck enters the injection cylinder, pump truck A pumps the temporary plugging agent into the high-pressure wellbore. Finally, the emptying liquid tank empties the liquid temporarily stored in the injection cylinder when the temporary plugging agent skid-mounted pump pumps the temporary plugging agent. By transforming the pipeline for transporting the temporary plugging agent by the pump in the horizontal well fracturing connection, it is possible to pump the temporary plugging agent without stopping the pump, efficiently and reliably, thereby avoiding the re-closure of the already fractured cracks and improving the temporary plugging effect. Description of the Drawings

[0029] Figure 1 It is a schematic structural diagram of the working process of the temporary plugging operation without stopping the pump of the present invention. Detailed Embodiment

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0031] As shown in the attached Figure 1 A surface pipeline connection device for pumping temporary plugging agent without stopping the pump in fracturing, including a temporary plugging agent skid-mounted tank, which is connected to pump truck A and a temporary plugging agent injection cylinder. A valve 2 is installed on the pipeline connecting the temporary plugging agent skid-mounted tank and the temporary plugging agent injection cylinder, and a valve 1 is installed on the pipeline connecting pump truck A and the temporary plugging agent injection cylinder. The temporary plugging agent injection cylinder is connected to a square-hole liquid tank and the wellhead, and a fracturing pump truck unit is installed in cooperation with the wellhead. A valve 4 is installed on the pipeline connecting the temporary plugging agent injection cylinder and the emptying liquid tank, a valve 3 is installed on the pipeline connecting the temporary plugging agent injection cylinder and the wellhead, and a valve 5 is installed on the pipeline connecting the wellhead and the fracturing pump unit.

[0032] A method for connecting surface pipelines, the specific steps are as follows:

[0033] S1: Use a temporary plugging agent skid-mounted tank to mix and pump temporary plugging agents of different particle sizes;

[0034] S2: Connect the temporary plugging agent skid-mounted tank to the temporary plugging agent injection cylinder, and install valve 2 on the connected pipeline. The volume of the temporary plugging agent injection cylinder is greater than the volume of the added temporary plugging agent, and its compressive strength is not lower than the strength of the surface high-pressure pipeline network;

[0035] S3: Then connect the pump truck A to the temporary plugging agent skid-mounted tank and the temporary plugging agent injection cylinder together, and install valve 1 on the connected pipeline. The pump truck A can provide the minimum displacement to transport the temporary plugging agent in the injection cylinder into the high-pressure wellbore;

[0036] S4: Connect the temporary plugging agent injection cylinder to the corresponding horizontal well, and install valve 3 on the connected pipeline;

[0037] S5: Connect a drain liquid tank to the pipeline connecting the temporary plugging agent injection cylinder and the horizontal well, and install valve 4 on the pipeline connected to the drain liquid tank. The volume of the drain liquid tank meets the volume of the liquid to be drained and discharged due to the pumping of all the temporary plugging agents in a horizontal well;

[0038] S6: Cooperatively connect a fracturing pump truck unit to the horizontal well, and install valve 5 on the pipeline connected to the fracturing pump truck unit.

[0039] The working process of the method for connecting surface pipelines for pumping temporary plugging agents without stopping the pump is as follows:

[0040] a: Close valve 3, open valve 5, and start the fracturing unit to complete the pre-temporary plugging fracturing construction;

[0041] b: After the first-stage fracturing is completed, the fracturing unit does not stop pumping, continues to pump fracturing fluid, keeps the fracture in an open state, and records the pipeline pumping pressure P1;

[0042] c: Close valve 1, open valve 2 and valve 4, start the temporary plugging agent skid-mounted unit, and slowly inject the mixed temporary plugging agents of different particle sizes into the temporary plugging agent injection cylinder;

[0043] d: Close valve 2 and valve 4; open valve 1, start pump truck A, and increase the pressure in the temporary plugging agent injection cylinder to P2 at a displacement lower than 0.5 cubic meters per minute, requiring P2 to be slightly greater than P1;

[0044] e: Slowly open valve 3, after it is fully opened, increase the displacement of pump truck A, pump all the temporary plugging agents into the wellbore, quickly close valve 3, and then stop pump truck A;

[0045] f: Increase the displacement of the fracturing unit, pump the temporary plugging agent in the wellbore to the fracture orifice, and complete the temporary plugging operation without stopping the pump.

[0046] Example 1

[0047] A method for connecting surface pipelines for pumping temporary plugging agent during fracturing without stopping the pump provided in this Example 1, the specific steps are as follows:

[0048] S1: Use the temporary plugging agent skid-mounted tank to mix and pump temporary plugging agents of different particle sizes;

[0049] S2: Connect the temporary plugging agent skid-mounted tank to the temporary plugging agent injection cylinder, and install Valve 2 on the connected pipeline. The volume of the temporary plugging agent injection cylinder is larger than the volume of the added temporary plugging agent, and its compressive strength is not lower than the strength of the surface high-pressure pipeline network;

[0050] S3: Then connect the Pump Truck A to the temporary plugging agent skid-mounted tank and the temporary plugging agent injection cylinder together, and install Valve 1 on the connected pipeline. Pump Truck A can provide the minimum displacement to transport the temporary plugging agent in the injection cylinder into the high-pressure wellbore;

[0051] S4: Connect the temporary plugging agent injection cylinder to the corresponding horizontal well, and install Valve 3 on the connected pipeline;

[0052] S5: Connect a drain liquid tank to the pipeline connecting the temporary plugging agent injection cylinder and the horizontal well, and install Valve 4 on the pipeline connected to the drain liquid tank. The volume of the drain liquid tank meets the volume of the liquid that needs to be drained and discharged due to pumping of all the temporary plugging agents for one horizontal well;

[0053] S6: Connect a fracturing pump truck unit in cooperation with the horizontal well, and install Valve 5 on the pipeline connected to the fracturing pump truck unit.

[0054] This Example 1 also provides a specific working process of the method for connecting surface pipelines for pumping temporary plugging agent during fracturing without stopping the pump: The process is as follows:

[0055] a: Close Valve 3, open Valve 5, and start the fracturing unit to complete the pre-temporary plugging fracturing construction;

[0056] b: After the first-stage fracturing is completed, the fracturing unit does not stop the pump, continues to pump fracturing fluid, keeps the fracture in an open state, and records the pipeline pumping pressure P1;

[0057] c: Close Valve 1, open Valve 2 and Valve 4, start the temporary plugging agent skid-mounted unit, and slowly inject the mixed temporary plugging agents of various different particle sizes into the temporary plugging agent injection cylinder;

[0058] d: Close Valve 2 and Valve 4; open Valve 1, start Pump Truck A, and increase the pressure in the temporary plugging agent injection cylinder to P2 at a displacement lower than 0.5 m³ / min, and it is required that P2 is slightly greater than P1;

[0059] e: Slowly open valve 3. After it is fully opened, increase the displacement of pump truck A and pump all the temporary plugging agent into the wellbore. Then quickly close valve 3, and then pump truck A stops pumping.

[0060] f: Increase the displacement of the fracturing unit and pump the temporary plugging agent in the wellbore to the crack orifice to complete the temporary plugging operation without stopping the pump.

[0061] Example 2

[0062] A method for connecting surface pipelines for pumping temporary plugging agent without stopping the pump in fracturing provided in this Example 2 specifically includes the following steps:

[0063] S1: Mix and pump temporary plugging agents with different particle sizes using a temporary plugging agent skid-mounted tank.

[0064] S2: Connect the temporary plugging agent skid-mounted tank to the temporary plugging agent injection cylinder, and install valve 2 on the connected pipeline. The volume of the temporary plugging agent injection cylinder is larger than the added volume of the temporary plugging agent, and its compressive strength is not lower than that of the surface high-pressure pipe manifold.

[0065] S3: Then connect pump truck A to the temporary plugging agent skid-mounted tank and the temporary plugging agent injection cylinder together, and install valve 1 on the connected pipeline. Pump truck A can provide the minimum displacement to transport the temporary plugging agent in the injection cylinder into the high-pressure wellbore.

[0066] S4: Connect the temporary plugging agent injection cylinder to the corresponding horizontal well, and install valve 3 on the connected pipeline.

[0067] S5: Connect a drain liquid tank to the pipeline connecting the temporary plugging agent injection cylinder and the horizontal well, and install valve 4 on the pipeline connected to the drain liquid tank. The volume of the drain liquid tank meets the volume of the liquid to be drained due to pumping of all the temporary plugging agent for one horizontal well.

[0068] S6: Cooperatively connect a fracturing pump truck unit to the horizontal well, and install valve 5 on the pipeline connected to the fracturing pump truck unit.

[0069] This Example 2 also provides a specific working process of the method for connecting surface pipelines for pumping temporary plugging agent without stopping the pump in fracturing: The process is as follows:

[0070] a: Close valve 3, open valve 5, and start the fracturing unit to complete the pre-temporary plugging fracturing construction.

[0071] b: After the first-stage fracturing is completed, the fracturing unit does not stop pumping, continues to pump fracturing fluid, keeps the crack in an open state, and records the pipeline pumping pressure P1.

[0072] c: Close valve 1, open valve 2 and valve 4, start the temporary plugging agent skid-mounted unit, and slowly inject the mixed temporary plugging agents with various different particle sizes into the temporary plugging agent injection cylinder.

[0073] d: Close valve 2 and valve 4; Open valve 1, start pump truck A, and increase the pressure in the temporary plugging agent injection cylinder to P2 at a displacement rate lower than 1 m³ / min, where P2 is required to be slightly greater than P1.

[0074] e: Slowly open valve 3. After it is fully opened, increase the displacement rate of pump truck A, pump all the temporary plugging agent into the wellbore, quickly close valve 3, and then stop pump truck A.

[0075] f: The fracturing unit increases the displacement rate and pumps the temporary plugging agent in the wellbore to the fracture mouth to complete the temporary plugging operation without stopping the pump.

[0076] Example 3

[0077] A method for connecting surface pipelines for pumping temporary plugging agent without stopping the pump in fracturing provided in this Example 3 specifically includes the following steps:

[0078] S1: Use the temporary plugging agent skid-mounted tank to mix and pump temporary plugging agents with different particle sizes.

[0079] S2: Connect the temporary plugging agent skid-mounted tank to the temporary plugging agent injection cylinder, and install valve 2 on the connected pipeline. The volume of the temporary plugging agent injection cylinder is larger than the added volume of the temporary plugging agent, and its compressive strength is not lower than that of the surface high-pressure pipe manifold.

[0080] S3: Then connect pump truck A to the temporary plugging agent skid-mounted tank and the temporary plugging agent injection cylinder together, and install valve 1 on the connected pipeline. Pump truck A can provide the minimum displacement rate to transport the temporary plugging agent in the injection cylinder into the high-pressure wellbore.

[0081] S4: Connect the temporary plugging agent injection cylinder to the corresponding horizontal well, and install valve 3 on the connected pipeline.

[0082] S5: Connect a drain liquid tank to the pipeline connecting the temporary plugging agent injection cylinder and the horizontal well, and install valve 4 on the pipeline connected to the drain liquid tank. The volume of the drain liquid tank meets the volume of the liquid discharged due to pumping of all the temporary plugging agents for one horizontal well.

[0083] S6: Cooperatively connect a fracturing pump truck unit to the horizontal well, and install valve 5 on the pipeline connected to the fracturing pump truck unit.

[0084] This Example 3 also provides a specific working process of the method for connecting surface pipelines for pumping temporary plugging agent without stopping the pump in fracturing: The process is as follows:

[0085] a: Close valve 3, open valve 5, and start the fracturing unit to complete the pre-temporary plugging fracturing construction.

[0086] b: After the first-stage fracturing is completed, the fracturing unit does not stop the pump, continues to pump fracturing fluid, keeps the fracture in an open state, and records the pipeline pumping pressure P1.

[0087] c: Close valve 1, open valve 2 and valve 4, start the temporary plugging agent skid-mounted unit, and slowly inject the mixed temporary plugging agents with various different particle sizes into the temporary plugging agent injection cylinder.

[0088] d: Close valve 2 and valve 4; open valve 1, start pump truck A, and increase the pressure in the temporary plugging agent injection cylinder to P2 at a displacement lower than 0.7 m³ / min, where P2 is required to be slightly greater than P1.

[0089] e: Slowly open valve 3. After it is fully opened, increase the displacement of pump truck A, pump all the temporary plugging agents into the wellbore, quickly close valve 3, and then stop pump truck A.

[0090] f: The fracturing unit increases the displacement and pumps the temporary plugging agents in the wellbore to the fracture tip to complete the temporary plugging operation without stopping the pump.

[0091] Example 4

[0092] A surface pipeline connection method for pumping temporary plugging agents without stopping the pump in fracturing provided in this Example 4 specifically includes the following steps:

[0093] S1: Use the temporary plugging agent skid-mounted tank to mix and pump temporary plugging agents with different particle sizes.

[0094] S2: Connect the temporary plugging agent skid-mounted tank to the temporary plugging agent injection cylinder, and install valve 2 on the connected pipeline. The volume of the temporary plugging agent injection cylinder is larger than the added volume of the temporary plugging agent, and its compressive strength is not lower than that of the surface high-pressure pipe manifold.

[0095] S3: Then connect pump truck A to the temporary plugging agent skid-mounted tank and the temporary plugging agent injection cylinder together, and install valve 1 on the connected pipeline. Pump truck A can provide the minimum displacement to transport the temporary plugging agents in the injection cylinder into the high-pressure wellbore.

[0096] S4: Connect the temporary plugging agent injection cylinder to the corresponding horizontal well, and install valve 3 on the connected pipeline.

[0097] S5: Connect a drain liquid tank to the pipeline connecting the temporary plugging agent injection cylinder and the horizontal well, and install valve 4 on the pipeline connected to the drain liquid tank. The volume of the drain liquid tank meets the volume of the liquid discharged due to pumping all the temporary plugging agents in a horizontal well.

[0098] S6: Cooperatively connect a fracturing pump truck unit to the horizontal well, and install valve 5 on the pipeline connected to the fracturing pump truck unit.

[0099] This Example 4 also provides a specific working process of the surface pipeline connection method for pumping temporary plugging agents without stopping the pump in fracturing: The process is as follows:

[0100] a: Close valve 3, open valve 5, and start the fracturing unit to complete the fracturing construction of the previous stage before temporary plugging.

[0101] b: After the first-stage fracturing is completed, the fracturing unit does not stop pumping, but continues to pump fracturing fluid to keep the fracture open, and records the pipeline pumping pressure P1.

[0102] c: Close valve 1, open valve 2 and valve 4, start the temporary plugging agent skid-mounted unit, and slowly inject the mixed temporary plugging agents with various different particle sizes into the temporary plugging agent injection cylinder.

[0103] d: Close valve 2 and valve 4; open valve 1, start pump truck A, and increase the pressure in the temporary plugging agent injection cylinder to P2 at a displacement lower than 0.9 m³ / min, and it is required that P2 is slightly greater than P1.

[0104] e: Slowly open valve 3. After it is fully opened, increase the displacement of pump truck A, pump all the temporary plugging agents into the wellbore, quickly close valve 3, and then stop pump truck A.

[0105] f: The fracturing unit increases the displacement and pumps the temporary plugging agents in the wellbore to the fracture orifice to complete the non-stop pumping temporary plugging operation.

[0106] Finally, the following points should be noted: First, in the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, which can be mechanical connection or electrical connection, or the communication inside two components, and can be directly connected. The terms "upper", "lower", "left", "right", etc. are only used to represent the relative position relationship. When the absolute position of the object being described changes, the relative position relationship may change.

[0107] Second: In the attached drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved. Other structures can refer to the general design. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0108] Finally: The above is only the preferred embodiment of the present invention and is not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A ground pipeline connection device for pumping temporary plugging agent without stopping the pump during fracturing, Characterized in that, it includes a temporary plugging agent skid-mounted tank, the temporary plugging agent skid-mounted tank is connected to Pump Truck A and a temporary plugging agent injection cylinder. A valve 2 is installed on the pipeline connecting the temporary plugging agent skid-mounted tank and the temporary plugging agent injection cylinder, and a valve 1 is installed on the pipeline connecting Pump Truck A and the temporary plugging agent injection cylinder. The temporary plugging agent injection cylinder is connected to a square-hole liquid tank and a wellhead, and a fracturing pump truck unit is fitted on the wellhead.

2. The ground pipeline connection device for pumping temporary plugging agent without stopping the pump during fracturing according to claim 1, Characterized in that, a valve 4 is installed on the pipeline connecting the temporary plugging agent injection cylinder and the drain liquid tank, and a valve 3 is installed on the pipeline connecting the temporary plugging agent injection cylinder and the wellhead.

3. The ground pipeline connection device for pumping temporary plugging agent without stopping the pump during fracturing according to claim 1, Characterized in that, a valve 5 is installed on the pipeline connecting the wellhead and the fracturing pump unit.

4. The ground pipeline connection device for pumping temporary plugging agent without stopping the pump during fracturing according to claim 1, Characterized in that, the temporary plugging agent skid-mounted tank, where the temporary plugging agent is mixed and added and then transported to the temporary plugging agent injection cylinder; the temporary plugging agent injection cylinder, both ends of the cylinder body are connected to the high-pressure pipeline, and the temporary plugging agent injection cylinder mainly plays the role of temporarily storing the temporary plugging agent; Pump Truck A, after the temporary plugging agent enters the injection cylinder, pumps the temporary plugging agent into the high-pressure wellbore; the drain liquid tank, which temporarily stores the emptied liquid in the injection cylinder when the temporary plugging agent skid-mounted pump pumps the temporary plugging agent.

5. The ground pipeline connection device for pumping temporary plugging agent without stopping the pump during fracturing according to claims 1-4, Characterized in that, it further includes a ground pipeline connection method, and the specific steps are as follows: S1: Use the temporary plugging agent skid-mounted tank to mix and pump temporary plugging agents with different particle sizes; S2: Connect the temporary plugging agent skid-mounted tank to the temporary plugging agent injection cylinder, and install a valve 2 on the connecting pipeline; S3: Then connect Pump Truck A to the temporary plugging agent skid-mounted tank and the temporary plugging agent injection cylinder together, and install a valve 1 on the connecting pipeline. Pump Truck A can provide the minimum displacement to transport the temporary plugging agent in the injection cylinder into the high-pressure wellbore; S4: Connect the temporary plugging agent injection cylinder to the corresponding horizontal well, and install a valve 3 on the connecting pipeline; S5: Connect the drain liquid tank to the pipeline connecting the temporary plugging agent injection cylinder and the horizontal well, and install a valve 4 on the pipeline connecting to the drain liquid tank; S6: Connect the fracturing pump truck unit to the horizontal well through cooperation, and install a valve 5 on the pipeline connecting to the fracturing pump truck unit.

6. The ground pipeline connection method according to claim 5, Characterized in that, the volume of the temporary plugging agent injection cylinder is larger than the added volume of the temporary plugging agent, and the compressive strength is not lower than the strength of the ground high-pressure pipeline manifold.

7. The ground pipeline connection method according to claim 5, Characterized in that, the volume of the drain liquid tank meets the volume of the liquid discharged due to pumping of all the temporary plugging agents in a horizontal well.

8. The ground pipeline connection device for pumping temporary plugging agent without stopping the pump during fracturing and a ground pipeline connection method according to claims 1-7, Characterized in that, It also includes the working process of the connection method of the surface pipeline for pumping the temporary plugging agent without stopping the pump, and the process is as follows: a: Close valve 3, open valve 5, and start the fracturing unit to complete the pre-temporary plugging fracturing construction; b: After the first-stage fracturing is completed, the fracturing unit does not stop pumping, continues to pump the fracturing fluid to keep the fracture in an open state, and record the pipeline pumping pressure P1; c: Close valve 1, open valve 2 and valve 4, start the temporary plugging agent skid-mounted unit, and slowly inject the mixed temporary plugging agents with various different particle sizes into the temporary plugging agent injection cylinder; d: Close valve 2 and valve 4; open valve 1, start pump truck A, and increase the pressure in the temporary plugging agent injection cylinder to P2 at a displacement lower than 0.5 m³ / min, and require that P2 is slightly greater than P1; e: Slowly open valve 3, after it is fully opened, increase the displacement of pump truck A, pump all the temporary plugging agent into the wellbore, quickly close valve 3, and then stop pump truck A; f: The fracturing unit increases the displacement and pumps the temporary plugging agent in the wellbore to the fracture orifice to complete the temporary plugging operation without stopping the pump.

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