Shale gas well flow-back fluid multi-path sampling device

Abstract

The invention discloses a shale gas well flow-back fluid multi-path sampling device. The shale gas well flow-back fluid multi-path sampling device comprises a rack, a multi-path sampling assembly and a storage tank connected with the multi-path sampling assembly through a pipeline. The multi-channel sampling assembly is fixedly arranged on the rack; specifically, the multi-channel sampling assembly comprises a driving motor and a selector, a plurality of evenly-distributed feeding connectors are arranged on the outer side of the selector at the top of the selector, the feeding connectors are communicated with the interior of the selector, a sampling connector is arranged at the bottom of the selector, and a mixed sampling connector is arranged on the outer side of the selector close to the sampling connector. According to the shale gas well flow-back fluid sampling device, multiple shale gas well flow-back fluids can be sampled through one device only by selecting the multiple sampling assemblies, multiple devices do not need to be adopted for collection, and the labor cost and the material cost are effectively reduced; and meanwhile, the work can be realized only through the cooperation of the driving motor, the multi-path adopting assembly and the various pipelines, so that the management, the operation and the maintenance are more convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of shale gas well flowback fluid processing equipment, and in particular relates to a shale gas well flowback fluid multi-channel sampling device. Background Art

[0002] Shale gas well flowback fluid refers to the fracturing fluid that has been injected into the ground to complete the fracturing purpose. The remaining material in the fracturing fluid must be returned to the ground for treatment or reuse.

[0003] Therefore, sampling and analyzing the return fluid produced by shale gas wells is an important process for monitoring the properties of the return fluid of shale gas wells. In the prior art, the sampling equipment for shale gas well return fluid can only collect samples from a single return fluid pipeline. When it is necessary to sample and analyze the return fluid samples of multiple gas wells on a platform, it is necessary to install sampling equipment on each return fluid pipeline, which is costly and requires separate operation and monitoring of each sampling equipment, which is inconvenient for unified management and use.

[0004] Therefore, there is an urgent need for a device that can sample and collect the return fluid from multiple gas wells. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a multi-channel sampling device for shale gas well flowback fluid.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] A shale gas well flowback fluid multi-channel sampling device, comprising a frame, a multi-channel sampling assembly and a storage tank connected to the multi-channel sampling assembly through a pipeline;

[0008] The multi-channel sampling component is fixedly arranged on the frame;

[0009] Specifically, the multi-channel sampling components include:

[0010] The driving motor is fixed on the top of the selector through a bracket;

[0011] The selector is arranged on the frame through pipelines. The selector is a shell structure with a hollow interior. A plurality of evenly distributed feed interfaces are arranged on the outside of the selector near the top of the selector. The feed interfaces are connected to the inside of the selector. A sampling interface is arranged at the bottom of the selector. A mixed sampling interface is arranged on the outside of the selector near the sampling interface. Both the sampling interface and the mixed sampling interface are connected to the inside of the selector. A flange is arranged at one end of the feed interface, the sampling interface and the mixed sampling interface away from the selector;

[0012] An inner core pipe connector is provided inside the selector, and the inner core pipe connector includes a rotating shaft, an inner tube, and a joint pipe fixed to a side of the inner tube close to the rotating shaft, the rotating shaft is connected to the driving end of the driving motor, the top of the inner tube is fixedly connected to the rotating shaft, the bottom of the inner tube is clamped to the inner side of the sampling interface, and the joint pipe and the feeding interface are located at the same horizontal line;

[0013] In the above device, a driving motor is used to drive the inner core pipe connector inside the selector to rotate, so that the joint pipe in the inner core pipe connector enters the sampling interface, thereby realizing selective and directional sampling of shale gas well return fluid.

[0014] Furthermore, a number of return liquid pipelines are fixedly installed on the frame, and valves are provided on the return liquid pipeline body. One end of the return liquid pipeline is connected to the feed interface of the selector through a flange, and the end away from the feed interface of the selector is provided with a flange, wherein the valve is used to control the on-off of the pipeline, and the setting of the flange is convenient for connection with the external shale gas well return liquid pipeline, so as to realize sampling of the shale gas well return liquid.

[0015] Furthermore, a sampling outlet pipeline is fixedly arranged on the frame, a valve is arranged on the pipe body of the sampling outlet pipeline, one end of the sampling outlet pipeline is connected to the sampling interface of the selector through a flange, and a flange is arranged on the end away from the sampling interface of the selector.

[0016] Furthermore, the storage tank includes a tank body, a ladder is provided on one side of the tank body, and an observation port, a pressure relief port, a feed port and a transfer port are provided in sequence on the top of the tank body close to the ladder. The observation port, pressure relief port, feed port and transfer port are all connected to the interior of the tank body, and seals are provided at the positions of the observation port, pressure relief port, feed port and transfer port. The feed port collects the return liquid through a sampling outlet pipeline.

[0017] Furthermore, a plurality of reserved openings are arranged on the rack, and the reserved openings are provided with flanges. The reserved openings are connected to the sampling outlet pipelines through reserved pipelines, and valves are arranged at the pipe bodies of the reserved pipelines.

[0018] Furthermore, the mixed sampling interface is connected to the mixed sampling outlet through a mixed sampling pipeline, the mixed sampling outlet is provided with a flange, the mixed sampling pipeline is provided with a branch pipeline which is conductively connected to the sampling outlet pipeline, and the branch pipeline is provided with a valve.

[0019] Furthermore, the cross-sectional diameter of the sampling pipeline is smaller than the cross-sectional diameter of the mixed sampling pipeline. The mixed sampling pipeline is used to sample and output the return fluids from multiple shale gas wells. Since there are differences in parameters between the return fluids from individual shale gas wells, the use of a pipeline with a larger cross-sectional diameter ensures the smoothness and safety of the transportation of the return fluids from the shale gas wells.

[0020] Furthermore, the end of the joint pipe away from the inner pipe is a flexible joint. The flexible joint can be more closely embedded in the feed interface and reduce the friction between the joint pipe and the inner wall of the selector, thereby greatly improving the service life of the selector.

[0021] Furthermore, a plurality of detection ports for connecting sampling instruments are provided on the top of the storage tube tank.

[0022] Furthermore, a reagent port for adding detection auxiliary reagents is provided on the top of the storage tube tank.

[0023] The beneficial effects of the present invention are:

[0024] In the embodiment of the present invention, through the setting of a multi-channel sampling component, when it is necessary to sample multiple shale gas well return fluids, the driving motor in the multi-channel sampling component is actuated to rotate the inner core pipe connector in the selector, so that the pipe joint in the inner core pipe connector is aligned with the different feed interfaces set on the selector, so as to achieve sampling of different shale gas well return fluids. That is, the multi-channel sampling device for shale gas well return fluid only needs to select the multi-channel sampling component to achieve sampling of multiple shale gas well return fluids with one device, without the need to use multiple devices for collection, effectively reducing the labor cost and material cost; at the same time, the present invention can be achieved through the action of the driving motor, which is convenient for management and operation, and solves the problem that in the prior art, when collecting shale gas well return fluids in multiple channels, a sampling device needs to be installed on each return fluid pipeline, the implementation cost is high, and each sampling device needs to be operated and monitored separately, which is inconvenient for unified management and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of a multi-channel sampling component of the present invention;

[0027] Figure 3 It is a cross-sectional view of a multi-channel sampling assembly of the present invention;

[0028] Figure 4 This is a schematic diagram of the selector structure of the present invention;

[0029] Figure 5 It is a schematic diagram of the structure of the inner core pipe connector of the present invention;

[0030] Figure 6 This is a schematic diagram of the storage tank structure of the present invention;

[0031] Figure 7 It is the working principle diagram of the present invention;

[0032] In the figure, 1- rack;

[0033] 2-Multi-channel sampling components,

[0034] 2.1-driving motor, 2.2-selector, 2.21-feeding interface, 2.22-sampling interface, 2.23-mixing sampling interface, 2.24-rotating shaft, 2.25-inner tube, 2.26-connector tube;

[0035] 3- Storage tank,

[0036] 3.1-tank body, 3.2-observation port, 3.3-pressure relief port, 3.4-feeding port, 3.5-adapter, 3.6-detection port, 3.7-reagent port, 3.8-ladder;

[0037] 4-return liquid pipeline, 5-sampling outlet pipeline, 6-reserved port, 7-mixed sampling pipeline. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0039] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0042] Embodiment 1:

[0043] See also Figure 1-Figure 5 The present invention provides a shale gas well flowback fluid multi-channel sampling device, comprising a frame 1, a multi-channel sampling component 2 and a storage tank 3 connected to the multi-channel sampling component 2 through a pipeline; the multi-channel sampling component 2 is fixedly arranged on the frame 1.

[0044] like Figure 2 As shown, specifically, the multi-channel sampling assembly 2 includes: a driving motor 2.1, which is fixed to the top of the selector 2.2 through a bracket; the selector 2.2 is fixed to the bracket through a pipeline, and is a shell structure with a hollow interior. The hollow structure setting allows the sampling of the selector 2.2 to have more optimization schemes. By setting the volume of the inner cavity of the selector 2.2, it is possible to achieve sampling of liquids of different densities, so that the present invention has more diverse uses. It should be noted that tools that achieve other sampling functions by changing the volume or interface position of the selector 2.2 of the present invention are considered to fall within the protection scope of the present invention.

[0045] like Figure 4 As shown, the selector 2.2 is provided with a plurality of evenly distributed feed interfaces 2.21 on the outside of the selector 2.2 near the top of the selector 2.2, and the feed interface 2.21 is connected to the inside of the selector 2.2. A sampling interface 2.22 is provided at the bottom of the selector 2.2, and a mixed sampling interface 2.23 is provided on the outside of the selector 2.2 near the sampling interface 2.22, and both the sampling interface 2.22 and the mixed sampling interface 2.23 are connected to the inside of the selector 2.2. A flange is provided at one end of the feed interface 2.21, the sampling interface 2.22 and the mixed sampling interface 2.23 away from the selector 2.2, wherein the setting of the flange can be connected to the external pipeline more quickly;

[0046] like Figure 3As shown, it can be seen that when the device needs to perform mixed sampling, there is no need to start the drive motor, and it is sufficient to connect the return liquid pipeline 4. When the return liquid pipeline 4 is connected, the shale gas well return liquid enters the selector 2.2 through the return liquid pipeline 4, and is output to the mixed sampling pipeline 7 through the mixed sampling interface 2.23 and finally enters the storage tank 3 for storage.

[0047] like Figure 2 and Figure 4 As shown, the selector 2.2 is mounted on the frame 1 after being connected to the pipeline through a flange, so the selector 2.2 can be separated from the frame 1 by disassembling the flange and the pipeline, which makes it convenient to maintain the selector 2.2 and also enables the present invention to have more usage scenarios, such as sampling of other liquids that need to be sampled in multiple ways, which can be achieved by reasonably connecting the flange on the selector 2.2;

[0048] like Figure 5 As shown, the selector 2.2 is provided with an inner core pipe connector inside, and the inner core pipe connector is used to receive shale gas well return fluid from different feed interfaces 2.21, and its specific structure is as follows:

[0049] It includes a rotating shaft 2.24, an inner tube 2.25 and a joint pipe 2.26 fixed on one side of the inner tube 2.25 near the rotating shaft 2.24, the rotating shaft 2.24 is connected to the driving end of the driving motor 2.1, the top of the inner tube 2.25 is fixedly connected to the rotating shaft 2.24, the bottom of the inner tube 2.25 is clamped on the inner side of the sampling interface 2.22, and the joint pipe 2.26 and the feeding interface 2.21 are located at the same horizontal line. It should be noted that the end of the joint pipe 2.26 away from the inner tube 2.25 is a soft joint, and the rotating shaft 2.24 is driven to rotate by the driving motor 2.1, and the inner tube 2.25 rotates in the selector 2.2. At the same time, because the joint pipe 2.26 and the feeding interface 2.21 are on the same horizontal line, the size of the joint pipe 2.26 can be set to allow the joint pipe 2.26 to dock and enter the sampling interface 2.22, so as to realize the sampling and collection of shale gas well return fluid at different sampling interface 2.22 positions.

[0050] like Figure 3 and Figure 4As shown, in this embodiment, through the action of the multi-channel sampling component 2, the sampling of shale gas well return fluid can be achieved from different shale gas wells, and the sampled shale gas well return fluid is stored in the storage tank 3; the specific implementation steps are as follows: start the driving motor 2.1 in the multi-channel sampling component 2, and the working end of the driving motor 2.1 works to drive the rotating shaft 2.24 in the selector 2.2 to rotate, and the rotation of the rotating shaft 2.24 drives the rotation of the inner tube 2.25, so that the joint pipe 2.26 is docked into different feed interfaces 2.21, and the sampling of shale gas well return fluid is achieved from different feed interfaces 2.21; after the sampling is completed, the sampled shale gas well return fluid enters the storage tank 3 through the sampling interface 2.22 or the mixed sampling interface 2.23.

[0051] Preferably, a plurality of return liquid pipelines 4 are fixedly arranged on the frame 1, a valve is provided on the pipe body of the return liquid pipeline 4, one end of the return liquid pipeline 4 is connected to the feed interface 2.21 of the selector 2.2 through a flange, and the end away from the feed interface 2.21 of the selector 2.2 is provided with a flange; the return liquid pipeline 4 is used to transport the return liquid of the shale gas well. This embodiment does not clearly indicate the way of connecting the return liquid pipeline 4 to the shale gas well, but it can be achieved by the flange provided on the return liquid pipeline 4. The use of the flange ensures the airtightness and safety of the pipeline. At the same time, due to the easy installation of the flange, the present invention can work in different scenarios and regions, which effectively improves the practicability of the present invention; similarly, the flange has a long service life, which greatly reduces the maintenance cost of the device of the present invention.

[0052] Preferably, a sampling outlet pipeline 5 is fixedly arranged on the frame 1, and a valve is provided at the pipe body of the sampling outlet pipeline 5. One end of the sampling outlet pipeline 5 is connected to the sampling interface 2.22 of the selector 2.2 through a flange, and the end away from the sampling interface 2.22 of the selector 2.2 is provided with a flange. The sampling outlet pipeline 5 is used to transport the shale gas well return fluid sampled in the selector 2.2 to the storage tank 3. The advantages of using a flange for the sampling outlet pipeline 5 are similar to those of the return fluid pipeline 4, so they are not repeated here.

[0053] Preferably, a plurality of reserved openings 6 are provided on the frame 1, and the reserved openings 6 are provided with flanges. The reserved openings 6 are connected to the sampling outlet pipeline 5 through a reserved pipeline, and a valve is provided at the position of the reserved pipeline body. It should be noted that the reserved openings 6 are used to divert the sampled shale gas well flowback fluid. When a large amount of shale gas well flowback fluid needs to be sampled, a single storage tank 3 may not be able to store all the sampled shale gas well flowback fluid due to volume reasons. Therefore, the excess shale gas well flowback fluid can be diverted through the reserved openings 6. Because a flange is provided, it is only necessary to connect the pipeline through the flange and then transport it to the remaining containers. This is not only convenient for operation, but also improves the fault tolerance of the device of the present invention, so that the present invention can be applied to more occasions without being restricted by storage.

[0054] Preferably, the mixed sampling interface 2.23 is connected to the mixed sampling outlet through the mixed sampling pipeline 7, the mixed sampling outlet is provided with a flange, the mixed sampling pipeline 7 is provided with a branch pipeline which is conductively connected to the sampling outlet pipeline 5, and the branch pipeline is provided with a valve. By setting the mixed sampling interface 2.23, the mixing and collection of the shale gas well return fluid can be achieved. The specific implementation method is as follows: the circulation of the sampling outlet pipeline 5 is closed by the valve, and the mixed sampling pipeline 7 is connected by the valve at the same time, thereby achieving mixed sampling and collection of the shale gas well return fluid.

[0055] Preferably, the cross-sectional diameter of the sampling pipeline is smaller than the cross-sectional diameter of the mixed sampling pipeline 7. According to the above scheme, it can be concluded that the sampling pipeline is used to transport the return liquid of individual sampling, and the mixed sampling pipeline 7 is used to transport the return liquid of multi-channel sampling. The use of the mixed sampling pipeline 7 with a larger inner diameter makes the sampling and transportation faster, thereby ensuring the sampling efficiency of the return liquid.

[0056] Preferably, the end of the joint pipe 2.26 away from the inner pipe 2.25 is a flexible joint, which can stably dock at the feed interface 2.21 and facilitate the rotation of the inner pipe 2.25 without wearing the inner wall of the selector 2.2, effectively improving the service life of the selector 2.2.

[0057] Embodiment 2:

[0058] See also Figure 6The storage tank 3 includes a tank body 3.1, a ladder 3.8 is provided on one side of the tank body 3.1, an observation port 3.2, a pressure relief port 3.3, a feed port 3.4 and a transfer port 3.5 are provided on the top of the tank body 3.1 near the ladder 3.8, and the observation port 3.2, the pressure relief port 3.3, the feed port 3.4 and the transfer port 3.5 are all connected to the inside of the tank body 3.1, and the observation port 3.2, the pressure relief port 3.3, the feed port 3.4 and the transfer port 3.5 are all provided with seals, and the feed port 3.4 collects the return fluid through the sampling outlet pipeline 5; it should be noted that the capacity of the storage tank 3 can be determined according to the specific implementation of the present invention. When the sampling volume of the return fluid of the shale gas well is small, it can be replaced with other storage methods that are convenient for transportation;

[0059] like Figure 6 As shown, the arrangement of the storage tank 3 is further described. This embodiment provides a storage tank 3 used for sampling a large amount of shale gas return fluid. The storage tank 3 includes a tank body 3.1. A tripod is provided at the bottom of the tank body 3.1, and a ladder 3.8 is provided on one side of the tank body 3.1. The ladder 3.8 is convenient for workers to climb to the top of the tank body 3.1 to perform relevant test operations on the storage tank 3. Furthermore, an observation port 3.2 is provided at the top of the tank body 3.1 near the ladder 3.8. The observation port 3.2 is sealed with a lid that is easy to open and has good sealing performance. Closed; a pressure relief port 3.3 is provided near the observation port 3.2. Because the shale gas well flowback fluid stored in the storage tank 3 contains gas impurities, a strong air pressure will be generated due to the discharge of the gas impurities in the sealed state. By providing a pressure relief valve to discharge the gas impurities inside the tank body 3.1, the air pressure in the tank body 3.1 is reduced, which greatly improves the safety of the storage tank 3 when storing the shale gas well flowback fluid. It should be noted that the pressure relief port 3.3 also needs to be sealed, and can be replaced by a pluggable piston or other seals that are convenient for opening the pressure relief port 3.3 for pressure relief;

[0060] A feed port 3.4 is provided on one side of the pressure relief port 3.3 for conveying the shale gas well return fluid sampled by the multi-channel sampling assembly 2 into the storage tank 3 for storage. A transfer port 3.5 is provided on one side of the feed port 3.4. Through the setting of the transfer port 3.5, multiple storage tanks 3 can be connected in parallel to realize the storage of a larger batch of shale gas well return fluid. At the same time, through the transfer port 3.5, the sampled shale gas well return fluid can be conveyed to other storage containers for further testing or detection.

[0061] Preferably, the top of the storage tube tank 3.1 is provided with a plurality of detection ports 3.6 for connecting sampling instruments. Through the setting of the detection ports 3.6, the following detection methods can be realized:

[0062] The sampling and testing instrument is introduced into the shale gas well flowback fluid through the testing port 3.6 to directly perform the measurement;

[0063] The shale gas well flowback fluid is led out through the detection port 3.6 for more precise measurement.

[0064] Preferably, a reagent port 3.7 for adding detection auxiliary reagents is provided on the top of the storage tube tank 3.1; it should be noted that the addition of the reagent port 3.7 is not necessary, and in this embodiment, the reagent port 3.7 is generally used for the detection of a smaller amount of shale gas return fluid.

[0065] Embodiment three:

[0066] See also Figure 7 This embodiment provides an implementation method of the present invention. When it is necessary to sample the return fluid of a shale gas well, the selector 2.2 is used to select the return fluid of a single shale gas well or multiple shale gas wells for sampling. This can be achieved by selecting different pipelines through the action of the drive motor 2.1 in the selector 2.2. After the sampling is completed, the sampled return fluid can be transported to the storage tank 3 through the sampling pipeline. It can be seen that the present invention has the advantages of simple operation and high feasibility. At the same time, when the sampled return fluid appears in a mixed form, the sampled return fluid is transported to the storage tank 3 through the mixed sampling pipeline 7. The sampled return fluid is transported through different pipelines, which can effectively improve the accuracy of return fluid detection.

[0067] It can be seen from this embodiment that, through the setting of the multi-channel sampling component 2, when it is necessary to sample the return fluids of multiple shale gas wells, the drive motor 2.1 in the multi-channel sampling component 2 is actuated to rotate the inner core pipe connector in the selector 2.2, so that the pipe joint in the inner core pipe connector is aligned with the different feed interfaces 2.21 set on the selector 2.2, and the return fluids of different shale gas wells can be sampled. That is, the invention only needs to select the multi-channel sampling component 2 to realize the sampling of multiple shale gas well return fluids with one device, and does not need to use multiple devices for collection, which effectively reduces the labor cost and material cost; at the same time, the present invention can be realized by the action of the drive motor 2.1, which is convenient for management and operation, and solves the problems in the prior art that when the return fluid of shale gas wells is collected in multiple channels, it is necessary to install a sampling device on each return fluid pipeline 4, the implementation cost is high, and each sampling device needs to be operated and monitored separately, which is inconvenient for unified management and use.

[0068] The above are only preferred embodiments of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the present invention through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A multi-channel sampling device for shale gas well flowback fluid, characterized in that: It includes a rack, a multi-channel sampling assembly, and a storage tank connected to the multi-channel sampling assembly through a pipeline; The multi-channel sampling component is fixedly arranged on the frame; Specifically, the multi-channel sampling components include: The driving motor is fixed on the top of the selector through a bracket; The selector is fixed to the frame through pipelines and is a shell structure with a hollow interior. A plurality of evenly distributed feed interfaces are arranged on the outside of the selector near the top of the selector, and the feed interfaces are connected to the inside of the selector. A sampling interface is arranged at the bottom of the selector, and a mixed sampling interface is arranged on the outside of the selector near the sampling interface. Both the sampling interface and the mixed sampling interface are connected to the inside of the selector. A flange is arranged at one end of the feed interface, the sampling interface and the mixed sampling interface away from the selector. An inner core pipe connector is provided inside the selector, and the inner core pipe connector includes a rotating shaft, an inner tube and a joint pipe fixed on the side of the inner tube close to the rotating shaft. The rotating shaft is connected to the driving end of the driving motor, the top of the inner tube is fixedly connected to the rotating shaft, the bottom of the inner tube is clamped on the inner side of the sampling interface, and the joint pipe and the feeding interface are located on the same horizontal line.

2. A shale gas well flowback fluid multi-channel sampling device according to claim 1, characterized in that: It comprises several return liquid pipelines, which are fixedly arranged on the frame, and valves are arranged on the pipe body of the return liquid pipeline. One end of the return liquid pipeline is connected to the feed interface of the selector through a flange, and the end away from the feed interface of the selector is provided with a flange.

3. A shale gas well flowback fluid multi-channel sampling device according to claim 1, characterized in that: It comprises a sampling outlet pipeline, which is fixedly arranged on a frame, a valve is arranged on the pipe body of the sampling outlet pipeline, one end of the sampling outlet pipeline is connected to the sampling interface of the selector through a flange, and a flange is arranged on the end away from the sampling interface of the selector.

4. A shale gas well flowback fluid multi-channel sampling device according to claim 1, characterized in that: The storage tank includes a tank body, a ladder is provided on one side of the tank body, and an observation port, a pressure relief port, a feed port and a transfer port are provided in sequence on the top of the tank body close to the ladder. The observation port, pressure relief port, feed port and transfer port are all connected to the inside of the tank body, and seals are provided at the positions of the observation port, pressure relief port, feed port and transfer port. The feed port collects the return liquid through a sampling outlet pipeline.

5. A shale gas well flowback fluid multi-channel sampling device according to claim 1, characterized in that: It also includes a plurality of reserved openings, each of which is provided with a flange. The reserved openings are connected to a sampling outlet pipeline through a reserved pipeline, and a valve is provided at the pipe body of the reserved pipeline.

6. A shale gas well flowback fluid multi-channel sampling device according to claim 1, characterized in that: The mixed sampling interface is connected to the mixed sampling outlet through a mixed sampling pipeline, the mixed sampling outlet is provided with a flange, the mixed sampling pipeline is provided with a branch pipeline which is conductively connected to the sampling outlet pipeline, and the branch pipeline is provided with a valve.

7. A shale gas well flowback fluid multi-channel sampling device according to claim 1, characterized in that: The cross-sectional diameter of the sampling pipeline is smaller than the cross-sectional diameter of the mixed sampling pipeline.

8. A shale gas well flowback fluid multi-channel sampling device according to claim 1, characterized in that: One end of the joint pipe away from the inner pipe is a flexible joint.

9. A shale gas well flowback fluid multi-channel sampling device according to claim 4, characterized in that: The top of the storage tube tank body is provided with a plurality of detection ports for connecting sampling instruments, and the detection ports penetrate into the interior of the tank body.

10. A shale gas well flowback fluid multi-channel sampling device according to claim 4, characterized in that: A reagent port for adding detection auxiliary reagents is provided on the top of the storage tube tank.

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