Fracturing fluid flowback simulation device for shale gas reservoir fractured horizontal well

Abstract

The utility model relates to the field of natural gas extraction, and particularly discloses a shale gas reservoir fractured horizontal well fracturing fluid flow-back simulation device which comprises a fracturing fluid injection mechanism, a fracturing fluid flow-back simulation mechanism, a fracturing fluid flow-back simulation mechanism and a fracturing fluid flow-back simulation mechanism, and the fracturing fluid flow-back simulation mechanism comprises a fracturing fluid storage and recovery assembly and a sleeve assembly fixedly connected with the fracturing fluid storage and recovery assembly; the rock stratum simulating mechanism comprises a rock stratum simulating assembly connected with the sleeve assembly and an adjusting assembly installed on the rock stratum simulating assembly; the fracturing fluid recovery mechanism comprises a recovery assembly connected with the fracturing fluid storage and recovery assembly and a recovery box assembly connected with the recovery assembly; the fracturing fluid storage and recovery assembly is controlled, the recovery assembly is made to work, fracturing fluid can enter the recovery box assembly after passing through the rock stratum simulation assembly, the sleeve assembly and the recovery assembly through work of the recovery assembly, and the size of the interior of the rock stratum simulation assembly can be changed by controlling work of the adjusting assembly. Therefore, scenes with different rock crack numbers can be simulated.

Description

Technical Field

[0001] The utility model belongs to the field of natural gas exploitation, in particular to a shale gas reservoir fracturing horizontal well fracturing fluid return simulation device. Background Art

[0002] In shale gas extraction, it is usually necessary to first drill a vertical well several thousand meters underground, then drill hundreds to thousands of meters horizontally, and then use large-scale hydraulic fracturing technology. This technology injects a mixture of clean water, ceramic particles, chemicals, etc. into the ground to "pry open" the rock layer containing natural gas flow at a pressure of tens to hundreds of megapascals, allowing the shale gas hidden deep in the shale layer to be released. When the fracturing fluid completes the fracturing task, the remaining substances need to be returned to the ground through the flowback process.

[0003] The existing Chinese patent CN216517974U discloses a shale gas reservoir fracturing horizontal well fracturing fluid return simulation device, including: a base, an injection cylinder is placed on the upper end of the base, one end of the injection cylinder is connected to a pipe, a sealing gasket is arranged at the connection between the pipe and the injection cylinder, the other end of the pipe is connected to a plug, the other end of the plug is connected to a telescopic tube, the middle of the telescopic tube is equipped with a liquid pump, and the end of the telescopic tube away from the plug is connected to a mixed liquid barrel. The shale gas reservoir fracturing horizontal well fracturing fluid return simulation device is provided with a secondary liquid chamber, which is used to simulate the influence of cracks generated in different directions on the backflow of fracturing fluid. The staff can open a single or multiple secondary liquid chambers by pulling out the sealing plate to explore the influence of multiple cracks on the backflow of fracturing fluid, increase the controllable environmental variables, improve the simulation diversity of the simulation device, and make the simulation results more meaningful.

[0004] The above-mentioned backflow simulation device has two channels for the injection pipe and the return pipe. Since the actual construction requires drilling to coordinate the placement of the injection pipe and the return pipe, the above-mentioned backflow simulation device is relatively costly in actual application. At the same time, the existing simulation device is not convenient for controlling the number of rock fractures, making it difficult to determine the impact of different numbers of rock fractures on the fracturing fluid backflow process. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a shale gas reservoir fracturing horizontal well fracturing fluid flowback simulation device to solve the problem that the simulation device in the prior art is inconvenient to control the number of rock fractures.

[0006] A shale gas reservoir fracturing horizontal well fracturing fluid flowback simulation device comprises: a fracturing fluid injection mechanism, including a fracturing fluid storage and recovery component, and a casing component fixedly connected to the fracturing fluid storage and recovery component; a simulated rock formation mechanism, including a simulated rock formation component interconnected with the casing component, and an adjusting component installed on the simulated rock formation component; a fracturing fluid recovery mechanism, including a recovery component interconnected with the fracturing fluid storage and recovery component, and a recovery box component connected to the recovery component.

[0007] Preferably, the fracturing fluid storage and recovery assembly includes a fracturing fluid storage box body, the lower end of the outer side of the fracturing fluid storage box body is connected to a high-pressure centrifugal pump through a pipeline, one side of the high-pressure centrifugal pump is fixedly connected to a main pipeline, one side of the main pipeline is provided with a bifurcation pipe, the upper side of the main pipeline is provided with valve one, and the upper side of the bifurcation pipe is provided with valve two.

[0008] Preferably, the sleeve assembly includes a sleeve body, one end of the sleeve body is fixedly connected to joint one, and the other end of the sleeve body is fixedly connected to joint two; the recovery assembly includes a recovery pipe body, one side of the recovery pipe body is fixedly connected to a self-priming pump, and the other end of the recovery pipe body is fixedly connected to a filter box; the recovery box assembly includes a recovery box body, and the lower end of the outer side of the recovery box body is fixedly connected to a guide pipe.

[0009] Preferably, the valve 1 is located between the high-pressure centrifugal pump and the bifurcated pipe, the joint 1 is fixedly connected to the main pipe, and the joint 2 is fixedly connected to the simulated rock formation assembly; one side of the self-priming pump is connected to the bifurcated pipe through a pipe, and one side of the filter box extends into the recovery box body through a pipe.

[0010] Preferably, the simulated rock formation component includes a hollow pipe, a pressure gauge is provided on the upper side of the hollow pipe, a plurality of branch pipes are provided inside the hollow pipe, and the lower end of one side of the hollow pipe is fixedly connected to a support frame; the adjustment component includes a connecting rod, a threaded rod and a motor, one end of the connecting rod is fixedly connected to a threaded block, the other end of the connecting rod is fixedly connected to a piston, and one end of the threaded rod is fixedly connected to a gear.

[0011] Preferably, the threaded rod is fixedly mounted on the support frame via a bearing, the motor can drive the gear to drive the threaded rod to rotate, the rotation of the threaded rod can drive the threaded block to slide along the support frame, and the piston is slidably embedded in the interior of the hollow pipe.

[0012] Compared with the prior art, the utility model has the following beneficial effects: by controlling the operation of the fracturing fluid storage and recovery component, the fracturing fluid can be injected into the simulated rock formation component through the casing component, and the injection of the fracturing fluid is stopped when the interior of the simulated rock formation component reaches a certain pressure, and the fracturing fluid storage and recovery component is controlled, and the recovery component is made to operate, and the operation of the recovery component can enable the fracturing fluid to pass through the simulated rock formation component, the casing component and the recovery component and then enter the recovery box component, and by controlling the operation of the adjustment component, the internal size of the simulated rock formation component can be changed, thereby simulating the scene of different numbers of rock fractures. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 It is a schematic diagram of the exploded structure of the utility model;

[0015] Figure 3 It is a structural schematic diagram of the fracturing fluid injection mechanism of the utility model;

[0016] Figure 4 It is a structural schematic diagram of the fracturing fluid recovery mechanism of the utility model;

[0017] Figure 5 It is a structural schematic diagram of the rock formation simulation mechanism of the utility model.

[0018] In the figure: 1. Fracturing fluid injection mechanism; 11. Fracturing fluid storage and recovery component; 111. Fracturing fluid storage box body; 112. High-pressure centrifugal pump; 113. Main pipeline; 114. Bifurcated pipe; 115. Valve 1; 116. Valve 2; 12. Casing component; 121. Casing body; 122. Connector 1; 123. Connector 2; 2. Simulated rock formation mechanism; 21. Simulated rock formation component; 211. Hollow pipe; 212. Support frame; 22. Adjustment component; 221. Connecting rod; 222. Threaded rod; 223. Motor; 224. Threaded block; 225. Piston; 226. Gear; 3. Fracturing fluid recovery mechanism; 31. Recovery component; 311. Recovery pipe body; 312. Self-priming pump; 313. Filter box; 32. Recovery box component; 321. Recovery box body; 322. Export pipe. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] like Figures 1 to 5 As shown:

[0021] Embodiment 1: The utility model provides a shale gas reservoir fracturing horizontal well fracturing fluid flowback simulation device, comprising: a fracturing fluid injection mechanism 1, including a fracturing fluid storage and recovery component 11, and a casing component 12 fixedly connected to the fracturing fluid storage and recovery component 11; a simulated rock formation mechanism 2, including a simulated rock formation component 21 interconnected with the casing component 12, and an adjustment component 22 installed on the simulated rock formation component 21; a fracturing fluid recovery mechanism 3, including a recovery component 31 interconnected with the fracturing fluid storage and recovery component 11, and a recovery box component 32 connected to the recovery component 31;

[0022] Among them, by controlling the operation of the fracturing fluid storage and recovery component 11, the fracturing fluid can be injected into the simulated rock formation component 21 through the casing component 12. When the internal pressure of the simulated rock formation component 21 reaches a certain level, the injection of the fracturing fluid is stopped. The fracturing fluid storage and recovery component 11 is controlled, and the recovery component 31 is made to operate. The operation of the recovery component 31 allows the fracturing fluid to pass through the simulated rock formation component 21, the casing component 12 and the recovery component 31 and then enter the recovery box component 32. By controlling the operation of the adjustment component 22, the internal size of the simulated rock formation component 21 can be changed, thereby simulating a scene with different numbers of rock fractures.

[0023] Specifically, the fracturing fluid storage and recovery component 11 includes a fracturing fluid storage box body 111, the lower end of the outer side of the fracturing fluid storage box body 111 is connected to a high-pressure centrifugal pump 112 through a pipeline, one side of the high-pressure centrifugal pump 112 is fixedly connected to a main pipeline 113, one side of the main pipeline 113 is provided with a bifurcated pipe 114, the upper side of the main pipeline 113 is provided with a valve 115, and the upper side of the bifurcated pipe 114 is provided with a valve 2 116.

[0024] Specifically, the sleeve assembly 12 includes a sleeve body 121, one end of the sleeve body 121 is fixedly connected to a joint 122, and the other end of the sleeve body 121 is fixedly connected to a joint 2 123; the recovery assembly 31 includes a recovery pipe body 311, one side of the recovery pipe body 311 is fixedly connected to a self-priming pump 312, and the other end of the recovery pipe body 311 is fixedly connected to a filter box 313; the recovery box assembly 32 includes a recovery box body 321, and the lower end of the outer side of the recovery box body 321 is fixedly connected to a guide pipe 322.

[0025] Specifically, valve 115 is located between the high-pressure centrifugal pump 112 and the bifurcated pipe 114, connector 122 is fixedly connected to the main pipe 113, and connector 2 123 is fixedly connected to the simulated rock formation assembly 21; one side of the self-priming pump 312 is interconnected with the bifurcated pipe 114 through a pipeline, and one side of the filter box 313 extends into the recovery box body 321 through a pipeline; wherein, the high-pressure centrifugal pump 112 and the self-priming pump 312 are both equipped with a flow display function.

[0026] As can be seen from the above, closing valve two 116 and opening valve one 115, and controlling the high-pressure centrifugal pump 112 to work can allow the fracturing fluid inside the fracturing fluid storage box body 111 to pass through the main pipeline 113 and the casing body 121 and then enter the simulated rock formation assembly 21. When the simulation is completed, closing valve one 115 and opening valve two 116, and controlling the self-priming pump 312 to work can allow the fracturing fluid in the hollow pipe 211 to pass through the casing body 121, the main pipeline 113, the recovery pipe body 311 and the filter box 313 and then be injected into the recovery box body 321. The filter box 313 can be used to filter the fracturing fluid, and the fracturing fluid in the recovery box body 321 can be discharged through the outlet pipe 322. The flow rate can be read out through the flow display function of the high-pressure centrifugal pump 112 and the self-priming pump 312.

[0027] Embodiment 2: This embodiment is basically the same as the previous embodiment, except that the simulated rock formation component 21 includes a hollow pipe 211, a pressure gauge is arranged on the upper side of the hollow pipe 211, a plurality of branch pipes are arranged inside the hollow pipe 211, and a support frame 212 is fixedly connected to the lower end of one side of the hollow pipe 211; the adjustment component 22 includes a connecting rod 221, a threaded rod 222 and a motor 223, one end of the connecting rod 221 is fixedly connected to a threaded block 224, the other end of the connecting rod 221 is fixedly connected to a piston 225, and one end of the threaded rod 222 is fixedly connected to a gear 226.

[0028] Specifically, the threaded rod 222 is fixedly mounted on the support frame 212 through a bearing, and the motor 223 can drive the gear 226 to drive the threaded rod 222 to rotate. The rotation of the threaded rod 222 can drive the threaded block 224 to slide along the support frame 212, and the piston 225 is slidably embedded in the interior of the hollow pipe 211.

[0029] As can be seen from the above, when the fracturing fluid is injected into the interior of the hollow pipe 211, the fracturing fluid will disperse into the bifurcated pipes, thereby simulating the effect of the fracturing fluid entering the rock fracture. The pressure inside the hollow pipe 211 can be monitored in real time through the pressure gauge, and the control motor 223 drives the gear 226 to drive the threaded rod 222 to rotate. The threaded rod 222 rotates to drive the threaded block 224 to slide along the support frame 212. The sliding of the threaded block 224 will cause the connecting rod 221 to drive the piston 225 to slide in the hollow pipe 211, thereby reducing the space in the hollow pipe 211. At the same time, the number of bifurcated pipes that the fracturing fluid can enter will also change, thereby better demonstrating the influence of the length of the hollow pipe 211 and the number of bifurcated pipes on the fracturing fluid return process.

[0030] The standard parts used in this utility model can be purchased from the market, and the special-shaped parts can be customized according to the description and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0031] In the description of the present utility model, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. The meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0035] In the drawings of the embodiments disclosed in the present utility model, only the structures related to the embodiments disclosed in the present utility model are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present utility model can be combined with each other.

[0036] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A shale gas reservoir fracturing horizontal well fracturing fluid flowback simulation device, characterized in that: include: A fracturing fluid injection mechanism (1) comprises a fracturing fluid storage and recovery component (11) and a casing component (12) fixedly connected to the fracturing fluid storage and recovery component (11); A simulated rock formation mechanism (2), comprising a simulated rock formation component (21) interconnected with the casing component (12), and an adjustment component (22) mounted on the simulated rock formation component (21); The fracturing fluid recovery mechanism (3) comprises a recovery component (31) interconnected with the fracturing fluid storage and recovery component (11), and a recovery box component (32) connected to the recovery component (31).

2. A shale gas reservoir fracturing horizontal well fracturing fluid flowback simulation device as claimed in claim 1, characterized in that: The fracturing fluid storage and recovery assembly (11) comprises a fracturing fluid storage box body (111), the lower end of the outer side of the fracturing fluid storage box body (111) is connected to a high-pressure centrifugal pump (112) via a pipeline, one side of the high-pressure centrifugal pump (112) is fixedly connected to a main pipeline (113), one side of the main pipeline (113) is provided with a bifurcated pipe (114), the upper side of the main pipeline (113) is provided with a valve 1 (115), and the upper side of the bifurcated pipe (114) is provided with a valve 2 (116).

3. A shale gas reservoir fracturing horizontal well fracturing fluid flowback simulation device as claimed in claim 2, characterized in that: The sleeve assembly (12) comprises a sleeve body (121), one end of the sleeve body (121) is fixedly connected to a joint 1 (122), and the other end of the sleeve body (121) is fixedly connected to a joint 2 (123); the recovery assembly (31) comprises a recovery pipe body (311), one side of the recovery pipe body (311) is fixedly connected to a self-priming pump (312), and the other end of the recovery pipe body (311) is fixedly connected to a filter box (313); the recovery box assembly (32) comprises a recovery box body (321), and the lower end of the outer side of the recovery box body (321) is fixedly connected to a guide pipe (322).

4. A shale gas reservoir fracturing horizontal well fracturing fluid flowback simulation device as claimed in claim 3, characterized in that: The valve 1 (115) is located between the high-pressure centrifugal pump (112) and the bifurcated pipe (114); the connector 1 (122) is fixedly connected to the main pipe (113); and the connector 2 (123) is fixedly connected to the simulated rock formation assembly (21); one side of the self-priming pump (312) is connected to the bifurcated pipe (114) through a pipe, and one side of the filter box (313) extends into the recovery box body (321) through a pipe.

5. A shale gas reservoir fracturing horizontal well fracturing fluid flowback simulation device as claimed in claim 3, characterized in that: The simulated rock formation component (21) comprises a hollow pipe (211), a pressure gauge is arranged on the upper side of the hollow pipe (211), a plurality of bifurcated pipes are arranged inside the hollow pipe (211), and a support frame (212) is fixedly connected to the lower end of one side of the hollow pipe (211); the adjustment component (22) comprises a connecting rod (221), a threaded rod (222) and a motor (223), one end of the connecting rod (221) is fixedly connected to a threaded block (224), the other end of the connecting rod (221) is fixedly connected to a piston (225), and one end of the threaded rod (222) is fixedly connected to a gear (226).

6. A shale gas reservoir fracturing horizontal well fracturing fluid flowback simulation device as claimed in claim 5, characterized in that: The threaded rod (222) is fixedly mounted on the support frame (212) via a bearing, and the motor (223) can drive the gear (226) to drive the threaded rod (222) to rotate. The rotation of the threaded rod (222) can drive the threaded block (224) to slide along the support frame (212), and the piston (225) is slidably embedded in the interior of the hollow pipe (211).

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