An online filling device and filling method for filling large-size temporary plugging agent

Abstract

The present invention discloses an online filling device for filling a large-sized temporary plugging agent, including a temporary plugging agent filler, a skid-mounted pump, a pumping pipeline, a hydraulic control device, and a hydraulic pipeline. The fracturing vehicle group is connected to the gas wellhead through the fracturing pipeline; the temporary plugging agent filler is also connected to the fracturing pipeline, the temporary plugging agent filler is connected to the skid-mounted pump, and the temporary plugging agent filler is also connected to the hydraulic control device. The temporary plugging agent filler is a cylindrical high-pressure device, and there are six layers of partitions inside the device. There is a small hole in the middle of each layer of partition, so that the entire device is connected inside. The lower end of the temporary plugging agent filler is directly connected to the fracturing pipeline, and the upper end has a pumping pipeline interface, which is connected to the skid-mounted pump through the pumping pipeline. The present invention also proposes an online filling method for a large-sized temporary plugging agent. When filling the temporary plugging agent, the hydraulic control valve is opened through the hydraulic pipeline by the hydraulic control device, and the temporary plugging agent is sent into the fracturing pipeline through the pumping pipeline by the skid-mounted pump, and the temporary plugging agent is sent into the wellbore through the gas wellhead through the fracturing pipeline.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to an online filling device for filling a large-size temporary plugging agent, and also relates to a filling method of the filling device. Background Art

[0002] Temporary plugging and diversion fracturing can plug the original fractures, realize fracture diversion, form new fractures, thus forming a complex fracture network system, increase the fracture drainage area, and achieve the purpose of increasing production.

[0003] The conventional temporary plugging and diversion fracturing method is to inject temporary plugging agents during the fracturing process to temporarily plug the cracks and force the cracks to divert and extend. The currently commonly used temporary plugging agents use particles of different sizes to accumulate in the pores, or form filter cakes through gelling operations, thereby forming a temporary plugging barrier layer with extremely low permeability and high pressure resistance, achieving crack plugging and diverting the cracks to extend. The filling method is generally to stop the pump and fill from the sand mixer.

[0004] The existing temporary plugging and diversion fracturing has the following problems:

[0005] (1) Using temporary plugging and diversion materials of different sizes to temporarily plug the cracks formed by the first fracturing has the disadvantage of poor controllability, which makes the crack extension pressure increase slightly, the crack diversion extension is not obvious, and it is not easy to form diversion cracks;

[0006] (2) After the temporary plugging agent needs to be pumped off, it is connected to another fracturing pipeline to the wellhead through another sand mixing truck, and then delivered to the bottom of the well at a small displacement to plug the cracks. After the fracturing pump is started, the bottom hole pressure is easy to break through the plugging pressure under the action of a large construction displacement, resulting in poor temporary plugging and diversion effect of the cracks, and the increase of fracturing equipment makes the ground process more complicated.

[0007] Therefore, large-sized temporary plugging agents are used to plug the perforations to improve the temporary plugging effect. At present, large-particle temporary plugging agents need to be injected from the fracturing wellhead, and the filling process is cumbersome, inconvenient for on-site construction, and greatly increases the construction time. In view of the filling process of large-particle temporary plugging agents, it is necessary to develop an online filling device and filling method for filling large-sized temporary plugging agents to facilitate temporary plugging fracturing construction, improve construction efficiency, and simplify the filling process. Summary of the invention

[0008] The purpose of the present invention is to provide an online filling device for filling large-size temporary plugging agents, so as to realize online filling of large-size temporary plugging agents through fracturing pumping pipelines, plug perforations, and improve temporary plugging and diversion plugging effects.

[0009] The present invention also aims to provide a filling method of an online filling device for filling a large-sized temporary plugging agent.

[0010] The first technical solution adopted by the present invention is: an online filling device for filling large-size temporary plugging agents, including a fracturing vehicle group, which is connected to the gas wellhead through a fracturing pipeline; a temporary plugging agent filler is also connected to the fracturing pipeline, the temporary plugging agent filler is connected to a skid-mounted pump, and the temporary plugging agent filler is also connected to a hydraulic control device.

[0011] The present invention is also characterized in that:

[0012] A pumping pipeline interface is provided on the upper part of the temporary plugging agent injector, and the skid-mounted pump is connected to the temporary plugging agent injector through the pumping pipeline, and the pumping pipeline is connected to the pumping pipeline interface.

[0013] The temporary plugging agent injector is a cylindrical high-pressure device. Six layers of partitions are arranged inside the temporary plugging agent injector. A small hole is arranged in the middle of each layer of partition to connect the entire device.

[0014] The temporary plugging agent filler divides the interior of the device into six hollow filling chambers through six layers of partitions. The hollow filling chambers are connected to the hydraulic control device through hydraulic pipelines; a hydraulic control valve is arranged on the hydraulic pipeline.

[0015] A large-sized temporary plugging agent is placed in the hollow injection cavity, and the large-sized temporary plugging agent is used to plug the perforation holes connecting the wellbore and the formation; the aperture of the small hole is not greater than 1 / 3 of the particle size of the large-sized temporary plugging agent.

[0016] The outer diameter of the large-size temporary plugging agent is 1.5 to 2.5 cm.

[0017] The temporary plugging agent injector has a pressure bearing capacity of 80-90 MPa.

[0018] The second technical solution adopted by the present invention is: an online filling method for filling a large-size temporary plugging agent, and the specific operation steps are as follows:

[0019] Step 1: Connect the fracturing and device surface process pipelines, close the first hydraulic control valve at the bottom of the temporary plugging agent injector, and load six large-sized temporary plugging agents into the six chambers of the temporary plugging agent injector respectively. Keep the skid-mounted pump and hydraulic control device in working condition;

[0020] Step 2: Perform the first stage fracturing construction. After the first stage fracturing construction is completed, stop the pump;

[0021] Step 3: Open the first hydraulic control valve at the bottom of the temporary plugging agent injector through the hydraulic control device, open the first baffle at the bottom, and use the skid-mounted pump to press the first large-size temporary plugging agent at the bottom into the fracturing pipeline, and start the fracturing vehicle, and use a displacement of 2 to 3 cubic meters / minute to send the temporary plugging agent into the wellbore through the fracturing pipeline. Stop the pump after the pump has injected 2 to 3 cubic meters of liquid;

[0022] Step 4: Open the first hydraulic control valve upward from the bottom of the temporary plugging agent injector through the hydraulic control device, open the first baffle upward from the bottom, and use the skid-mounted pump to send the first large-sized temporary plugging agent upward from the bottom into the fracturing pipeline, and start the fracturing vehicle, and send the temporary plugging agent into the wellbore at a displacement of 2-3 cubic meters / minute. Stop the pump after the pump has injected 2-3 cubic meters of liquid;

[0023] Step 5: Add the 3rd to 6th large-sized temporary plugging agents in sequence according to the steps;

[0024] Step 6: After completing the filling of large-size temporary plugging agent, start the fracturing vehicle group and carry out the second-stage fracturing construction. After the construction is completed, stop the pump.

[0025] The beneficial effects of the present invention are:

[0026] (1) Use large-size temporary plugging agents to temporarily plug the perforations, which has strong plugging reliability, realizes the diversion of the crack ends, and opens new fractures;

[0027] (2) Large-sized temporary plugging agents are added through temporary plugging agent injectors that are used for online filling of fracturing pipelines. The two processes of temporary plugging agent filling and fracturing construction in conventional temporary plugging fracturing are simplified into one process flow, realizing online filling of temporary plugging agents in the fracturing process, saving fracturing equipment such as fracturing pump trucks and sand mixing trucks, and reducing equipment investment costs and construction operation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of an online filling device for filling a large-sized temporary plugging agent according to the present invention;

[0029] Figure 2 The present invention Figure 1 Schematic diagram of the structure of the temporary plugging agent injector.

[0030] In the figure, 1. fracturing vehicle assembly; 2. fracturing pipeline; 3. gas production wellhead; 4. temporary plugging agent injector; 4-1. partition; 4-2. hydraulic control valve; 4-3. small hole; 4-4. pumping pipeline interface; 5. temporary plugging agent; 6. hydraulic pipeline; 7. hydraulic control device; 8. pumping pipeline; 9. skid-mounted pump. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0032] The present invention proposes an online filling device for filling a large-sized temporary plugging agent, the structure of which is as follows: Figure 1 As shown, it includes a fracturing vehicle group 1, which is connected to a gas wellhead 3 through a fracturing pipeline 2; a temporary plugging agent injector 4 is also connected to the fracturing pipeline 2, the temporary plugging agent injector 4 is connected to a skid-mounted pump 9, and the temporary plugging agent injector 4 is also connected to a hydraulic control device 7.

[0033] A pumping pipeline interface 4 - 4 is provided on the upper part of the temporary plugging agent injector 4 , and the skid-mounted pump 9 is connected to the temporary plugging agent injector 4 through a pumping pipeline 8 , and the pumping pipeline 8 is connected to the pumping pipeline interface 4 - 4 .

[0034] like Figure 2 As shown, the temporary plugging agent injector 4 is a cylindrical high-pressure device, and six layers of partitions 4-1 are arranged inside the temporary plugging agent injector 4. A small hole 4-3 is arranged in the middle of each layer of partition to make the whole device internally connected.

[0035] The temporary plugging agent filler 4 divides the interior of the device into six hollow filling chambers through six layers of partitions 4-1. The hollow filling chambers are connected to the hydraulic control device 7 through hydraulic pipelines 6; a hydraulic control valve 4-2 is arranged on the hydraulic pipeline 6.

[0036] A large-sized temporary plugging agent 5 is placed in the hollow filling cavity, and the large-sized temporary plugging agent 5 is used to plug the perforation hole connecting the wellbore and the formation; the aperture of the small hole 4-3 is not larger than 1 / 3 of the particle size of the large-sized temporary plugging agent 5; the particle size of the large-sized temporary plugging agent 5 is slightly larger than the perforation hole.

[0037] The outer diameter of the large-sized temporary plugging agent 5 is 1.5 to 2.5 cm.

[0038] The temporary plugging agent injector 4 has a pressure bearing capacity of 80-90 MPa.

[0039] The present invention proposes an online filling method for filling a large-size temporary plugging agent, and the specific operation steps are as follows:

[0040] Step 1: Connect the fracturing and surface process pipelines of the device, close the first hydraulic control valve 4-2 at the bottom of the temporary plugging agent injector 4, and respectively load six large-sized temporary plugging agents 5 into the six chambers of the temporary plugging agent injector 4, and keep the skid-mounted pump 9 and the hydraulic control device 7 in working condition;

[0041] Step 2: Perform the first stage fracturing construction. After the first stage fracturing construction is completed, stop the pump;

[0042] Step 3: Open the first hydraulic control valve 4-2 at the bottom of the temporary plugging agent injector 4 through the hydraulic control device 7, open the first lower partition 4-1, and use the skid-mounted pump 9 to press the first large-size temporary plugging agent 5 at the bottom into the fracturing pipeline 2, and start the fracturing vehicle 1, and send the temporary plugging agent 5 into the wellbore through the fracturing pipeline 2 at a displacement of 2-3 cubic meters / minute, and stop the pump after the pumping volume is 2-3 cubic meters;

[0043] Step 4: Open the second hydraulic control valve 4-2 upward from the bottom of the temporary plugging agent injector 4 through the hydraulic control device 7, open the second baffle 4-1 upward from the bottom, and use the skid-mounted pump 9 to send the second large-sized temporary plugging agent 5 upward from the bottom into the fracturing pipeline 2, and start the fracturing vehicle 1, send the temporary plugging agent 5 into the wellbore at a displacement of 2-3 cubic meters / minute, and stop the pump after the pumping volume is 2-3 cubic meters;

[0044] Step 5: Add the 3rd to 6th large-size temporary plugging agents 5 in sequence according to step 4;

[0045] Step 6: After the large-size temporary plugging agent 5 is filled, the fracturing vehicle group 1 is started to carry out the second-stage fracturing construction, and the pump is stopped after the construction is completed.

[0046] The present invention utilizes a large-sized temporary plugging agent 5 to temporarily plug the perforation holes, has high plugging reliability, realizes crack diversion at the seam end, and opens a new fracture. The large-sized temporary plugging agent 5 is injected through a temporary plugging agent injector 4 injected online through the fracturing pipeline 2, which saves fracturing equipment, simplifies the ground process flow, and reduces equipment costs and construction operation costs.

[0047] The present invention will be further described below in conjunction with specific embodiments.

[0048] Example 1

[0049] refer to Figure 1 The present invention proposes an online filling device for filling a large-size temporary plugging agent, which includes: a temporary plugging agent filler 4, a skid-mounted pump 9, a pumping pipeline 8, a hydraulic control device 7, and a hydraulic pipeline 6. The fracturing process includes a fracturing vehicle group 1, a fracturing pipeline 2, and a gas wellhead 3. The temporary plugging agent filler 4 includes a partition 4-1, a hydraulic control valve 4-2, and a pumping pipeline interface 4-4.

[0050] The fracturing process is connected smoothly as follows: the fracturing vehicle group 1 is connected to the gas wellhead 3 through the fracturing pipeline 2, and a temporary plugging agent injector 4 is installed on the fracturing pipeline 2.

[0051] The structure and connection process of the temporary plugging agent injector 4 are as follows: the temporary plugging agent injector 4 is a cylindrical high-pressure device, and there are six layers of partitions 4-1 inside the temporary plugging agent injector 4. There is a small hole 4-3 in the middle of each layer of partition, so that the whole device is connected inside, and each layer of partition 4-1 is provided with a hydraulic control valve 4-2, and the hydraulic control valve 4-2 is connected to the hydraulic control device 7 through a hydraulic pipeline 6. The lower end of the temporary plugging agent injector 4 is directly connected to the fracturing pipeline 2, and the upper end of the temporary plugging agent injector 4 is provided with a pumping pipeline interface 4-4, which is connected to the skid-mounted pump 9 through a pumping pipeline 8.

[0052] The temporary plugging agent injector 4 is a high-pressure device, and the pressure inside the device is consistent with the pressure of the fracturing pipeline 2.

[0053] The temporary plugging agent filler 4 divides the interior of the device into six chambers through six layers of partitions 4-1. A large-sized temporary plugging agent 5 is placed in each chamber. There is a small hole 4-3 in the middle of the partition, and the pressure in the six chambers is the same.

[0054] The large-sized temporary plugging agent 5 is used to plug the perforation holes. The pressure-bearing grade of the main body meets the plugging requirements of fracturing construction, and the pressure-bearing capacity reaches 80-90MPa. The outer diameter of the temporary plugging agent 5 is 1.5-2.5 cm.

[0055] Example 2

[0056] An online filling method for filling a large-size temporary plugging agent, the specific operation steps are as follows:

[0057] Step 1: Connect the fracturing and surface process pipelines of the device, close the first hydraulic control valve 4-2 at the bottom of the temporary plugging agent injector 4, and respectively load six large-sized temporary plugging agents 5 into the six chambers of the temporary plugging agent injector 4, and keep the skid-mounted pump 9 and the hydraulic control device 7 in working condition;

[0058] Step 2: Perform the first stage fracturing construction. After the first stage fracturing construction is completed, stop the pump;

[0059] Step 3: Open the first hydraulic control valve 4-2 at the bottom of the temporary plugging agent injector 4 through the hydraulic control device 7, open the first lower partition 4-1, and use the skid-mounted pump 9 to press the first large-size temporary plugging agent 5 at the bottom into the fracturing pipeline 2, and start the fracturing vehicle 1, and send the temporary plugging agent 5 into the wellbore through the fracturing pipeline 2 at a displacement of 2 to 3 cubic meters per minute, and stop the pump after the pump has injected 2 cubic meters of liquid;

[0060] Step 4: Open the second hydraulic control valve 4-2 upward from the bottom of the temporary plugging agent injector 4 through the hydraulic control device 7, open the second baffle 4-1 upward from the bottom, and use the skid-mounted pump 9 to send the second large-sized temporary plugging agent 5 upward from the bottom into the fracturing pipeline 2, and start the fracturing vehicle 1, send the temporary plugging agent 5 into the wellbore with a displacement of 2 cubic meters / minute, and stop the pump after the pump injects 2 cubic meters of liquid;

[0061] Step 5: Add the 3rd to 6th large-size temporary plugging agents 5 in sequence according to step 4;

[0062] Step 6: After the large-size temporary plugging agent 5 is filled, the fracturing vehicle group 1 is started to carry out the second-stage fracturing construction, and the pump is stopped after the construction is completed.

[0063] Example 3

[0064] An online filling method for filling a large-size temporary plugging agent, the specific operation steps are as follows:

[0065] Step 1: Connect the fracturing and surface process pipelines of the device, close the first hydraulic control valve 4-2 at the bottom of the temporary plugging agent injector 4, and respectively load six large-sized temporary plugging agents 5 into the six chambers of the temporary plugging agent injector 4, and keep the skid-mounted pump 9 and the hydraulic control device 7 in working condition;

[0066] Step 2: Perform the first stage fracturing construction. After the first stage fracturing construction is completed, stop the pump;

[0067] Step 3: Open the first hydraulic control valve 4-2 at the bottom of the temporary plugging agent injector 4 through the hydraulic control device 7, open the first lower partition 4-1, and use the skid-mounted pump 9 to press the first large-size temporary plugging agent 5 at the bottom into the fracturing pipeline 2, and start the fracturing vehicle 1, and send the temporary plugging agent 5 into the wellbore through the fracturing pipeline 2 at a displacement of 3 cubic meters per minute, and stop the pump after the pumping volume reaches 3 cubic meters;

[0068] Step 4: Open the second hydraulic control valve 4-2 upward from the bottom of the temporary plugging agent injector 4 through the hydraulic control device 7, open the second baffle 4-1 upward from the bottom, and use the skid-mounted pump 9 to deliver the second large-sized temporary plugging agent 5 upward from the bottom into the fracturing pipeline 2, and start the fracturing vehicle 1, and deliver the temporary plugging agent 5 into the wellbore at a displacement of 3 cubic meters / minute, and stop the pump after the pumping volume is 3 cubic meters;

[0069] Step 5: Add the 3rd to 6th large-size temporary plugging agents 5 in sequence according to step 4;

[0070] Step 6: After the large-size temporary plugging agent 5 is filled, the fracturing vehicle group 1 is started to carry out the second-stage fracturing construction, and the pump is stopped after the construction is completed.

[0071] Example 4

[0072] An online filling method for filling a large-size temporary plugging agent, the specific operation steps are as follows:

[0073] Step 1: Connect the fracturing and surface process pipelines of the device, close the first hydraulic control valve 4-2 at the bottom of the temporary plugging agent injector 4, and respectively load six large-sized temporary plugging agents 5 into the six chambers of the temporary plugging agent injector 4, and keep the skid-mounted pump 9 and the hydraulic control device 7 in working condition;

[0074] Step 2: Perform the first stage fracturing construction. After the first stage fracturing construction is completed, stop the pump;

[0075] Step 3: Open the first hydraulic control valve 4-2 at the bottom of the temporary plugging agent injector 4 through the hydraulic control device 7, open the first lower partition 4-1, and use the skid-mounted pump 9 to press the first large-size temporary plugging agent 5 at the bottom into the fracturing pipeline 2, and start the fracturing vehicle 1, and send the temporary plugging agent 5 into the wellbore through the fracturing pipeline 2 at a displacement of 2.5 cubic meters per minute, and stop the pump after the pumping volume is 2.5 cubic meters;

[0076] Step 4: Open the second hydraulic control valve 4-2 upward from the bottom of the temporary plugging agent injector 4 through the hydraulic control device 7, open the second baffle 4-1 upward from the bottom, and use the skid-mounted pump 9 to deliver the second large-sized temporary plugging agent 5 upward from the bottom into the fracturing pipeline 2, and start the fracturing vehicle 1, and deliver the temporary plugging agent 5 into the wellbore at a displacement of 2.5 cubic meters per minute, and stop the pump after the pumping liquid volume is 2.5 cubic meters;

[0077] Step 5: Add the 3rd to 6th large-size temporary plugging agents 5 in sequence according to step 4;

[0078] Step 6: After the large-size temporary plugging agent 5 is filled, the fracturing vehicle group 1 is started to carry out the second-stage fracturing construction, and the pump is stopped after the construction is completed.

[0079] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. The components and structures not described in detail in this embodiment are well-known components and common structures or common means in the industry, and are not described here one by one.

Claims

1. An online filling device for filling large-size temporary plugging agents, characterized in that: The invention comprises a fracturing vehicle group (1), wherein the fracturing vehicle group (1) is connected to a gas production wellhead (3) via a fracturing pipeline (2); a temporary plugging agent injector (4) is also connected to the fracturing pipeline (2), the temporary plugging agent injector (4) is connected to a skid-mounted pump (9), and the temporary plugging agent injector (4) is also connected to a hydraulic control device (7); The temporary plugging agent injector (4) is a cylindrical high-pressure device. Six layers of partitions (4-1) are arranged inside the temporary plugging agent injector (4). A small hole (4-3) is arranged in the middle of each layer of partitions, so that the entire device is connected internally. The temporary plugging agent injector (4) is divided into six hollow injecting chambers by six layers of partitions (4-1), and the hollow injecting chambers are connected to the hydraulic control device (7) via hydraulic pipelines (6); a hydraulic control valve (4-2) is provided on the hydraulic pipeline (6); A large-sized temporary plugging agent (5) is placed in the hollow injection cavity, and the large-sized temporary plugging agent (5) is used to plug the perforation hole connecting the wellbore and the formation; the aperture of the small hole (4-3) is not greater than 1 / 3 of the particle size of the large-sized temporary plugging agent (5); the outer diameter of the large-sized temporary plugging agent (5) is 1.5 to 2.5 centimeters.

2. An online filling device for filling a large-size temporary plugging agent according to claim 1, It is characterized in that A pumping pipeline interface (4-4) is provided on the upper portion of the temporary plugging agent injector (4); the skid-mounted pump (9) is connected to the temporary plugging agent injector (4) via a pumping pipeline (8); and the pumping pipeline (8) is connected to the pumping pipeline interface (4-4).

3. The online filling device for filling large-size temporary plugging agent according to claim 1 is characterized in that: The temporary plugging agent injector (4) has a main body pressure bearing capacity of 80-90 MPa.

4. An online filling method for filling a large-sized temporary plugging agent, using an online filling device for filling a large-sized temporary plugging agent according to any one of claims 1 to 3, characterized in that: The specific steps are as follows: Step 1: Connect the online filling device of the large-sized temporary plugging agent, close the first hydraulic control valve (4-2) at the bottom of the temporary plugging agent filler (4), and respectively load six large-sized temporary plugging agents (5) into the six chambers of the temporary plugging agent filler (4), while keeping the skid-mounted pump (9) and the hydraulic control device (7) in working condition; Step 2: Perform the first stage fracturing construction. After the first stage fracturing construction is completed, stop the pump; Step 3: Open the first hydraulic control valve (4-2) at the bottom of the temporary plugging agent injector (4) through the hydraulic control device (7), open the first baffle (4-1) at the bottom, and use the skid-mounted pump (9) to press the first large-sized temporary plugging agent (5) at the bottom into the fracturing pipeline (2), and start the fracturing vehicle group (1), and send the large-sized temporary plugging agent (5) into the wellbore through the fracturing pipeline (2) at a displacement of 2 to 3 cubic meters per minute, and stop the pump after the injection volume is 2 to 3 cubic meters; Step 4: Open the second hydraulic control valve (4-2) upward from the bottom of the temporary plugging agent injector (4) through the hydraulic control device (7), open the second baffle (4-1) upward from the bottom, and use the skid-mounted pump (9) to deliver the second large-sized temporary plugging agent (5) upward from the bottom into the fracturing pipeline (2), and start the fracturing vehicle group (1), deliver the large-sized temporary plugging agent (5) into the wellbore at a displacement of 2 to 3 cubic meters per minute, and stop the pump after the injection volume is 2 to 3 cubic meters; Step 5: Add the third to sixth large-sized temporary plugging agents (5) in sequence according to step 4; Step 6: After the large-size temporary plugging agent (5) is injected, the fracturing vehicle group (1) is started to carry out the second-stage fracturing operation. After the operation is completed, the pump is stopped.

Images