Carbon dioxide storage and injection apparatus for shale reservoir exploitation and methods of use thereof

Abstract

The application discloses a kind of carbon dioxide storage and injection device in shale reservoir exploitation and its use method, belong to shale oil and gas development technical field, to solve the problem that carbon dioxide is susceptible to external environment temperature in storage and injection in shale reservoir exploitation, the carbon dioxide storage and injection device in shale reservoir exploitation includes carbon dioxide storage tank (1), shield pump (2) and plunger pump (3), carbon dioxide storage tank (1) and shield pump (2) are connected by transmission pipeline between, shield pump (2) and plunger pump (3) are also connected by transmission pipeline between, plunger pump outlet (17) outside also be connected with the transmission pipeline, the transmission pipeline is equipped with temperature adjusting structure outside.The carbon dioxide storage and injection device in shale reservoir exploitation can transmit the temperature in transmission pipeline, to ensure the stability and low temperature liquid state of carbon dioxide in transmission pipeline when conveying, improve the success rate of field construction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shale oil and gas development, in particular to a device for storing and injecting carbon dioxide in shale reservoir exploitation and a method for using the device. BACKGROUND

[0002] Compared with conventional reservoirs, shale reservoirs are more compact, and can only be economically developed after artificial fracturing. However, the overall recovery degree is still significantly lower than that of conventional oil and gas reservoirs. Shale oil and gas reservoirs have broad prospects and application value through carbon dioxide injection for enhanced recovery. In shale gas reservoirs, carbon dioxide can enter nanoscale pores and adsorb on the surface of shale to displace methane gas. In shale oil reservoirs, carbon dioxide can interact with crude oil to change the properties of crude oil and increase the flowability of shale oil in porous media. In addition, carbon dioxide entering shale reservoirs can achieve carbon sequestration, utilization and storage, which has a significant contribution to global low-carbon environmental protection.

[0003] The temperature and pressure of carbon dioxide are the determining factors of the phase state of carbon dioxide. To inject liquid carbon dioxide, a certain temperature and pressure need to be maintained, which is a necessary condition for continuous and normal construction. When the ambient temperature is high, it is not conducive to maintaining low-temperature liquid state of carbon dioxide and normal injection. However, when the ambient temperature is too low, the liquid carbon dioxide in the pipeline is also affected. Since there is a certain distance between the carbon dioxide storage tank and the shield pump, and between the shield pump and the plunger pump, in order to facilitate the transmission of liquid carbon dioxide, most of them are transmitted through the transmission pipeline. The transmission pipeline directly exposed to the outside is easily affected by the outside temperature.

[0004] The existing technology has the following technical problems: when storing and injecting carbon dioxide in shale reservoir exploitation, the transmission pipeline between the carbon dioxide storage tank and the shield pump, and between the shield pump and the plunger pump is exposed to the outside, which is easily affected by the ambient temperature of the exploitation. SUMMARY

[0005] In order to solve the problem that carbon dioxide is easily affected by the ambient temperature during storage and injection in shale reservoir exploitation, the present application provides a device for storing and injecting carbon dioxide in shale reservoir exploitation and a method for using the device. The device for storing and injecting carbon dioxide in shale reservoir exploitation can adjust the temperature in the transmission pipeline between the carbon dioxide storage tank and the shield pump, and between the shield pump and the plunger pump, thereby ensuring the stability of the internal liquid carbon dioxide temperature in the transmission pipeline between the carbon dioxide storage tank and the shield pump, and between the shield pump and the plunger pump during transmission. This can make carbon dioxide better maintain low-temperature liquid state and improve the success rate of on-site construction.

[0006] The technical solution adopted by the present application to solve the technical problems is:

[0007] The utility model provides a kind of carbon dioxide storage and injection device in shale reservoir exploitation, including carbon dioxide storage tank, shield pump and plunger pump, carbon dioxide storage tank and shield pump are connected by transmission pipeline between, shield pump and plunger pump are also connected by transmission pipeline between, the transmission pipeline is also connected with the outlet of plunger pump, the transmission pipeline is equipped with temperature adjusting structure, the temperature adjusting structure can adjust the temperature in the transmission pipeline.

[0008] A kind of carbon dioxide storage and injection device in shale reservoir exploitation method for the carbon dioxide storage and injection device in shale reservoir exploitation, the carbon dioxide storage and injection device in shale reservoir exploitation method for the carbon dioxide storage and injection device in shale reservoir exploitation described above, the carbon dioxide storage and injection device in shale reservoir exploitation method includes the following steps: when the temperature in the transmission pipeline is lower than set value, the temperature adjusting structure heats the transmission pipeline;When the temperature in the transmission pipeline is higher than set value, the temperature adjusting structure cools the transmission pipeline.

[0009] The utility model has the advantages of solving the problem that carbon dioxide storage tank and shield pump, shield pump and plunger pump are exposed to the outside and are easily affected by the temperature of the external environment during the carbon dioxide storage and injection in shale reservoir exploitation, ensuring that carbon dioxide can be better maintained in a low-temperature liquid state during the transmission of the transmission pipeline between the carbon dioxide storage tank and the shield pump and the shield pump and the plunger pump. BRIEF DESCRIPTION OF DRAWINGS

[0010] The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the application and are incorporated herein by reference. The embodiments disclosed herein illustrate the present application and do not limit the application as claimed.

[0011] Figure 1 is a schematic view of the carbon dioxide storage and injection device in shale reservoir exploitation described in the utility model.

[0012] Figure 2 is a cross-sectional view of the temperature adjusting structure.

[0013] Figure 3 is a schematic view of the half cover.

[0014] Figure 4 is a schematic view of the sealing connection structure.

[0015] Figure 5 is an external schematic view of the protection structure.

[0016] Figure 6 is an internal schematic view of the protection structure.

[0017] The reference signs are explained as follows:

[0018] 1, carbon dioxide storage tank; 2, shield pump; 3, plunger pump; 4, gas injection well pipe; 5, sealing connection structure; 6, front end pipe; 7, storage tank gas outlet valve; 8, storage tank check valve; 9, shield pump inlet; 10, shield pump gas inlet valve; 11, shield pump outlet; 12, intermediate pipe; 13, shield pump gas outlet valve; 14, shield pump check valve; 15, plunger pump inlet; 16, plunger pump gas inlet valve; 17, plunger pump outlet; 18, plunger pump gas outlet valve; 19, tail end pipe; 20, plunger pump check valve; 21, well pipe inlet valve; 22, cover; 23, limiting plate; 24, fixed plate; 25, heating pipe; 26, refrigeration pipe; 27, pipe mounting through hole; 28, support cover; 29, handle; 30, threaded sleeve; 31, fixed rod; 32, threaded pipe; 33, limiting ring; 34, storage tank outlet; 35, storage tank inlet; 36, storage tank gas inlet valve; 38, security control single-chip microcomputer; 39, temperature sensor; 40, temperature control single-chip microcomputer; 41, sealing cover plate;

[0019] 511, first flange; 512, second flange; 513, screw rod; 514, second sealing convex ring; 515, first sealing groove; 516, sealing rubber gasket; 517, first sealing convex ring; 518, second sealing groove. DETAILED DESCRIPTION

[0020] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0021] A carbon dioxide storage and injection device in shale reservoir exploitation includes a carbon dioxide storage tank 1, a shield pump 2 and a plunger pump 3. The carbon dioxide storage tank 1 and the shield pump 2 are connected through a transmission pipe. The shield pump 2 and the plunger pump 3 are also connected through a transmission pipe. The shield pump 2 and the gas injection well pipe 4 are also connected through a transmission pipe (i.e. the transmission pipe is also connected to the plunger pump outlet 17). The transmission pipe is provided with a temperature adjusting structure which can adjust the temperature in the transmission pipe, as shown in Figure 1 .

[0022] The carbon dioxide storage and injection device in shale reservoir exploitation solves the problem that the transmission pipes between the carbon dioxide storage tank and the shield pump, between the shield pump and the plunger pump and between the shield pump and the gas injection well pipe are exposed to the outside and are easily affected by the temperature of the external environment during the storage and injection of carbon dioxide in the existing shale reservoir exploitation. The transmission pipes between the carbon dioxide storage tank and the shield pump and between the shield pump and the plunger pump can ensure that the carbon dioxide can be better maintained in a low-temperature liquid state during transmission.

[0023] In the embodiment, the carbon dioxide storage tank 1 comprises a storage tank outlet 34 and a storage tank inlet 35, the shield pump 2 comprises a shield pump inlet 9 and a shield pump outlet 11, the plunger pump 3 comprises a plunger pump inlet 15 and a plunger pump outlet 17, the storage tank outlet 34 and the shield pump inlet 9, the shield pump outlet 11 and the plunger pump inlet 15, and the plunger pump outlet 17 and the injection well pipe 4 are connected by the transmission pipeline.

[0024] The transmission structure comprises a head pipeline 6, an intermediate pipeline 12 and a tail pipeline 19, the storage tank outlet 34 is connected with the head pipeline 6 through the sealing connection structure 5 far from one end of the carbon dioxide storage tank 1, and the head pipeline 6 is connected with the shield pump inlet 9 through another sealing connection structure 5 far from the carbon dioxide storage tank 1, the storage tank outlet 34 is provided with a storage tank gas outlet valve 7, the shield pump inlet 9 is provided with a shield pump gas inlet valve 10, the shield pump outlet 11 is connected with the intermediate pipeline 12 through the sealing connection structure 5, the intermediate pipeline 12 is provided with a shield pump gas outlet valve 13 near one end of the shield pump 2, the plunger pump inlet 15 is provided with a plunger pump gas inlet valve 16, the plunger pump outlet 17 is provided with a plunger pump gas outlet valve 18, the plunger pump outlet 17 is connected with the tail pipeline 19 through the sealing connection structure 5, and the tail pipeline 19 is provided with a well pipe inlet valve 21 near one end of the injection well pipe 4, the head pipeline 6, the intermediate pipeline 12 and the tail pipeline 19 between the storage tank gas outlet valve 7 and the storage tank check valve 8, the shield pump check valve 14 and the plunger pump gas inlet valve 16, and the well pipe inlet valve 21 and the injection well pipe 4 are all provided with the temperature adjusting structure.

[0025] The head pipeline 6 is provided with the storage tank check valve 8 near one end of the shield pump inlet 9, the intermediate pipeline 12 between the shield pump gas outlet valve 13 and the plunger pump inlet 15 is provided with the shield pump check valve 14, the tail pipeline 19 between the well pipe inlet valve 21 and the plunger pump outlet 17 is provided with the plunger pump check valve 20, the storage tank inlet 35 is provided with a storage tank gas inlet valve 36, each shield pump inlet 9 and plunger pump inlet 15 is provided with a liquid sensor, each shield pump 2 and plunger pump 3 is provided with an intelligent control single-chip microcomputer 38, the output end of the liquid sensor on the shield pump inlet 9 is electrically connected with the input end of the intelligent control single-chip microcomputer 38 on the shield pump 2, the output end of the intelligent control single-chip microcomputer 38 on the shield pump 2 is electrically connected with the input end of the shield pump 2, the output end of the liquid sensor on the plunger pump inlet 15 is electrically connected with the input end of the intelligent control single-chip microcomputer 38 on the plunger pump 3, and the output end of the intelligent control single-chip microcomputer 38 on the plunger pump 3 is electrically connected with the input end of the plunger pump 3.

[0026] First, open the storage tank inlet valve 36, fill the liquid carbon dioxide into the carbon dioxide storage tank 1 through the storage tank inlet 35, and close the storage tank inlet 35 after filling. After closing the storage tank inlet 35, open the storage tank outlet valve 7, the storage tank check valve 8, and the shield pump inlet valve 10, so that the carbon dioxide in the carbon dioxide storage tank 1 is discharged into the first-end pipeline 6 through the storage tank outlet 34, and then discharged into the shield pump inlet 9 through the first-end pipeline 6. After the liquid sensor in the shield pump inlet 9 detects the liquid carbon dioxide, a signal is transmitted to the safety control single-chip microcomputer 38, so that the shield pump 2 is opened by the safety control single-chip microcomputer 38, the shield pump 2 is pressurized and fed, and the shield pump outlet valve 13, the shield pump check valve 14 and the plunger pump inlet valve 16 are opened at the same time, so that the shield pump 2 delivers carbon dioxide to the plunger pump inlet 15. After the plunger pump inlet 15 detects the liquid carbon dioxide, a signal is also transmitted to the safety control single-chip microcomputer 38 by the liquid sensor, so that the plunger pump 3 is controlled to run by the safety control single-chip microcomputer 38, and the plunger pump outlet valve 18, the plunger pump check valve 20 and the well pipe inlet valve 21 are opened at the same time. The plunger pump 3 can inject liquid carbon dioxide into the injection well pipe 4 through the tail-end pipeline 19, and then inject the injection well pipe 4 into the shale reservoir for gas drive.

[0027] In the embodiment, the temperature adjusting structure comprises an outer cover 22, a heating pipe 25 and a refrigeration pipe 26. The outer cover 22 is a cylindrical structure with both ends closed, and the axis of the outer cover 22 coincides with the axis of the transmission pipeline. An annular cavity is formed between the outer cover 22 and the transmission pipeline. The heating pipe 25 and the refrigeration pipe 26 are both arranged in the annular cavity in the outer cover 22. The heating pipe 25 can increase the temperature in the outer cover 22, and the refrigeration pipe 26 can decrease the temperature in the outer cover 22. The heating pipe 25 can be an existing device capable of heating liquid carbon dioxide (such as an electric heating device), and the refrigeration pipe 26 can be an existing device capable of cooling liquid carbon dioxide, such as Figure 2 and Figure 3 as shown.

[0028] Along the axis direction of the outer cover 22, both ends of the outer cover 22 are provided with pipeline mounting through holes 27, and the transmission pipeline is matchedly arranged through the pipeline mounting through holes 27. A plurality of heating pipes 25 and a plurality of refrigeration pipes 26 are arranged in the outer cover 22 of the temperature adjusting structure. The axes of the heating pipes 25 and the refrigeration pipes 26 are parallel to the axis of the outer cover 22. The heating pipes 25 and the refrigeration pipes 26 are alternately and uniformly arranged along the circumferential direction of the outer cover 22.

[0029] In the embodiment, the outer cover 22 comprises two half cover bodies arranged symmetrically along the circumference of the outer cover 22, the edges of the half cover bodies are provided with fixing plates 24, and the fixing plates 24 of the two half cover bodies are connected and fixed by bolts and nuts. The transmission pipeline is provided with two limiting plates 23, and the outer cover 22 is arranged between the two limiting plates 23 in a matched manner, that is, along the axis of the outer cover 22, the length of the outer cover 22 is equal to the distance between the two limiting plates 23, and the outer diameters of the limiting plates 23 are both greater than the diameter of the pipeline mounting through hole 27, so that the limiting plates 23 can limit the outer cover 22. The outer cover 22 should have good sealing performance, and the annular cavity is an annular sealing cavity.

[0030] The temperature adjusting structure is arranged outside the first end pipeline 6 between the tank gas outlet valve 7 and the shield pump inlet 9, outside the middle pipeline 12 between the shield pump gas outlet valve 13 and the plunger pump inlet 15, and outside the tail end pipeline 19 close to the gas injection well pipeline 4, that is, the temperature adjusting structure is arranged outside the first end pipeline 6, the middle pipeline 12 and the tail end pipeline 19. The surfaces of the first end pipeline 6, the middle pipeline 12 and the tail end pipeline 19 outside each outer cover 22 are provided with a heat preservation coating, and the outer side of the heat preservation coating is wrapped with heat insulation material, so as to facilitate heat preservation of the first end pipeline 6, the middle pipeline 12 and the tail end pipeline 19. The outer cover 22 can also be provided with heat insulation material.

[0031] In the embodiment, a temperature sensor 39 is arranged in the transmission pipeline, a temperature control single-chip microcomputer 40 is arranged on the outer cover 22, the output end of the temperature sensor 39 is electrically connected with the input end of the temperature control single-chip microcomputer 40, and the output end of the temperature control single-chip microcomputer 40 is electrically connected with the input end of the heating pipe 25 and the input end of the refrigeration pipe 26, as shown in Figure 2 .

[0032] Specifically, the temperature sensor 39 is arranged on the inner wall of the first end pipeline 6, the middle pipeline 12 and the tail end pipeline 19 inside each outer cover 22, the temperature control single-chip microcomputer 40 is arranged on each outer cover 22, the output end of each temperature sensor 39 is electrically connected with the input end of the corresponding temperature control single-chip microcomputer 40, the output end of each temperature control single-chip microcomputer 40 is electrically connected with the input end of the corresponding heating pipe 25 and refrigeration pipe 26, and the limiting plate 23 is fixed on the first end pipeline 6, the middle pipeline 12 and the tail end pipeline 19 at both ends of each outer cover 22.

[0033] During injection, the temperature sensor 39 inside the first end pipeline 6, the middle pipeline 12 and the tail end pipeline 19 detects the temperature of the internal carbon dioxide, when the temperature exceeds the safety value, the temperature sensor 39 transmits a signal to the temperature control single-chip microcomputer 40, the temperature control single-chip microcomputer 40 receives the signal and controls the heating pipe 25 or the refrigeration pipe 26 to operate, that is, the temperature of the outer side of the first end pipeline 6 can be raised or lowered, so as to adjust the temperature of the carbon dioxide inside the first end pipeline 6, the middle pipeline 12 or the tail end pipeline 19.

[0034] Before opening the tank outlet valve 7, the tank check valve 8, the shield pump inlet valve 10, the shield pump outlet valve 13, the shield pump check valve 14, the plunger pump inlet valve 16, the plunger pump outlet valve 18, the plunger pump check valve 20 and the well pipe inlet valve 21, the air tightness of the head pipe 6, the middle pipe 12 and the tail pipe 19 is checked, and the shield pump 2 and the plunger pump 3 are also checked. After confirming that there is no fault, the power supply is turned on to open the shield pump 2 and the plunger pump 3, so that the plunger pump 3 and the injection well pipe 4 run under no load for 5-10 minutes, and the head pipe 6, the middle pipe 12 and the tail pipe 19 are exhausted. The length of the head pipe 6 is 5-10 meters, and the length of the middle pipe 12 is 10-15 meters.

[0035] In this embodiment, the carbon dioxide tank 1, the shield pump 2 and the plunger pump 3 are connected with the transmission pipe through the sealing connection structure 5. The sealing connection structure 5 includes a first flange 511 and a second flange 512, and the first flange 511 and the second flange 512 are connected and fixed by a screw rod 513, as shown in the figure. Figure 4

[0036] The end face of the first flange 511 towards the second flange 512 is provided with a first sealing convex ring 517 and a first sealing groove 515. The axis of the first sealing convex ring 517 and the axis of the first sealing groove 515 are coincident with the axis of the first flange 511. The first sealing convex ring 517 and the first sealing groove 515 are in a concentric relationship. The diameter of the first sealing convex ring 517 and the diameter of the first sealing groove 515 are different. For example, the diameter of the first sealing convex ring 517 is smaller than the diameter of the first sealing groove 515.

[0037] The end face of the second flange 512 towards the first flange 511 is provided with a second sealing convex ring 514 and a second sealing groove 518. The first sealing convex ring 517 is matchingly inserted into the second sealing groove 518. A sealing rubber gasket 516 is arranged between the first sealing convex ring 517 and the second sealing groove 518. The first sealing convex ring 517 is sealingly connected with the second sealing groove 518 through the sealing rubber gasket 516. The second sealing convex ring 514 is matchingly inserted into the first sealing groove 515. A sealing rubber gasket 516 is arranged between the second sealing convex ring 514 and the first sealing groove 515. The second sealing convex ring 514 is sealingly connected with the first sealing groove 515 through the sealing rubber gasket 516. The thickness of the first sealing convex ring 517, the first sealing groove 515 and the sealing rubber gasket 516 is smaller than the thickness of the first flange 511 and the second flange 512.

[0038] ​The first flange 511 is fixed on one side of the head pipeline 6 close to the tank outlet 34, one side of the shield pump inlet 9 close to the head pipeline 6, one side of the intermediate pipeline 12 close to the shield pump outlet 11, one side of the plunger pump inlet 15 close to the intermediate pipeline 12, one side of the tail pipeline 19 close to the plunger pump outlet 17, one side of the injection well pipe 4 close to the tail pipeline 19, and one side of the tank outlet 34 close to the head pipeline 6. The second flange 512 is fixed on one side of the head pipeline 6 close to the shield pump inlet 9, one side of the shield pump outlet 11 close to the intermediate pipeline 12, one side of the intermediate pipeline 12 close to the plunger pump inlet 15, one side of the plunger pump outlet 17 close to the tail pipeline 19, one side of the tail pipeline 19 close to the injection well pipe 4, and one side of the tank outlet 34 close to the head pipeline 6. A plurality of fixed screws 513 are fixed on one side of each first flange 511 close to the second flange 512 at equal distances, and the end of the fixed screw 513 extending to the outside of the second flange 512 is threadedly sleeved with a nut.

[0039] In the embodiment, the transmission pipeline connected to the plunger pump outlet 17 is the tail pipeline 19, the outlet of the tail pipeline 19 is connected to the inlet of the injection well pipe 4, and a protection structure is arranged outside the outlet of the tail pipeline 19, which can support and reinforce the outlet of the tail pipeline 19 and the inlet of the injection well pipe 4. The protection structure contains a threaded pipe 32, a threaded sleeve 30 and a support cover 28 which are sequentially sleeved from inside to outside, as shown in Figure 5 and Figure 6

[0040] The threaded pipe 32 is fixedly sleeved outside the outlet of the tail pipeline 19, the outlet of the tail pipeline 19 is in an upright state, the threaded pipe 32 is threadedly connected with the threaded sleeve 30, the threaded sleeve 30 is connected and fixed with the support cover 28 through the fixed rod 31, the support cover 28 is externally fixed with a handle 29, the inlet of the injection well pipe 4 is sleeved with a sealing cover plate 41, and the lower end surface of the threaded pipe 32 is arranged obliquely relative to the axis of the threaded pipe 32. When the support cover 28 is screwed, the support cover 28 can move up and down, and the lower end of the support cover 28 can be lower than the lower end surface of the sealing cover plate 41.

[0041] Specifically, the fixed rod 31 is symmetrically fixed outside the threaded sleeve 30, and the outer ends of the fixed rod 31 are fixed on the inner wall of the support cover 28. By holding the handle 29 and rotating the support cover 28, the fixed rod 31 can be rotated through the support cover 28, the threaded sleeve 30 is rotated when the fixed rod 31 is rotated, and the support cover 28 can be driven down through the threaded connection between the threaded sleeve 30 and the threaded pipe 32. When the support cover 28 moves down, it can be pressed into the soil layer or shale layer to support and reinforce the tail pipeline 19 and the injection well pipe 4.

[0042] ​The bottom end of the support cover 28 is provided with an inclined shape, and a plurality of handles 29 are fixed on the outer surface of the upper part of the support cover 28 at equal intervals. A limiting ring 33 is fixed on the tail pipe 19 at the top end of the threaded pipe 32, and the outer diameter of the limiting ring 33 is greater than the inner diameter of the threaded sleeve 30. A sealing cover plate 41 is fixed at the top end of the gas injection well pipe 4. After the gas injection well pipe 4 is installed, the sealing cover plate 41 is tightly abutted on the ground. The outer diameter of the sealing cover plate 41 is greater than the outer diameter of the sealing connection structure 5. The inner diameter of the support cover 28 is greater than the outer diameter of the sealing cover plate 41. The height between the bottom end of the threaded sleeve 30 and the bottom end of the threaded pipe 32 is greater than the height between the bottom end of the support cover 28 and the bottom end of the sealing cover plate 41, as shown in Figure 5 and Figure 6 .

[0043] After the gas injection well pipe is installed, the sealing cover plate is tightly abutted on the ground. The support cover is rotated by holding the handle. The fixed rod is rotated by the support cover. The threaded sleeve is rotated by the fixed rod. The threaded connection between the threaded sleeve and the threaded pipe is achieved. The support cover is lowered. The support cover is pressed into the soil or shale layer when it is lowered, so as to support and reinforce the tail pipe and the gas injection well pipe.

[0044] The use method of the carbon dioxide storage and injection device in shale reservoir exploitation will be introduced below. The use method of the carbon dioxide storage and injection device in shale reservoir exploitation adopts the carbon dioxide storage and injection device in shale reservoir exploitation. The use method of the carbon dioxide storage and injection device in shale reservoir exploitation includes the following steps: when the temperature in the transmission pipe is lower than the set value, the temperature adjusting structure heats the transmission pipe; when the temperature in the transmission pipe is higher than the set value, the temperature adjusting structure cools the transmission pipe.

[0045] The use method of the carbon dioxide storage and injection device in shale reservoir exploitation further includes:

[0046] 1、First open the storage tank inlet valve 36, through the storage tank inlet 35 into the liquid carbon dioxide carbon dioxide storage tank 1 inside, filled, close the storage tank inlet 35, close the storage tank inlet 35, open the storage tank outlet valve 7, storage tank check valve 8, shield pump inlet valve 10, so that the carbon dioxide storage tank 1 inside carbon dioxide through the storage tank outlet 34 discharge first end pipeline 6 inside, then through the first end pipeline 6 discharge shield pump inlet 9 inside, shield pump inlet 9 inside liquid sensor detects the liquid carbon dioxide, after the signal is transmitted to the security control single chip microcomputer 38, that can be through the security control single chip microcomputer 38 control shield pump 2 open, shield pump 2 pressurized feeding, at the same time open shield pump outlet valve 13, shield pump check valve 14 and plunger pump inlet valve 16, so that the shield pump 2 will carbon dioxide to the plunger pump inlet 15, plunger pump inlet 15 inside detects the liquid carbon dioxide, also through the liquid sensor signal is transmitted to the security control single chip microcomputer 38, that can be through the security control single chip microcomputer 38 control plunger pump 3 operation, at the same time open plunger pump outlet valve 18, plunger pump check valve 20 and well pipe inlet valve 21, plunger pump 3 can through the tail end pipeline 19 liquid carbon dioxide injection into the injection well pipe 4 inside, that can be through the injection well pipe 4 injection into the shale reservoir for gas drive;

[0047] 2、Injection, first end pipeline 6, intermediate pipeline 12 and tail end pipeline 19 inside temperature sensor 39 operation detection inside carbon dioxide temperature, when the temperature exceeds the safety value, temperature sensor 39 signal is transmitted to the temperature control single chip microcomputer 40, temperature control single chip microcomputer 40 receives the signal, control heating tube 25 or refrigeration pipe 26 operation, that can be on the first end pipeline 6 outside heating or cooling, so as to adjust the temperature of the carbon dioxide in the first end pipeline 6, intermediate pipeline 12 or tail end pipeline 19;

[0048] 3、After the installation of injection well pipe 4, drive the sealing cover plate 41 tightly abut on the ground, hold the handle 29 rotation support cover 28, that can be through the support cover 28 drive fixed rod 31 rotation, fixed rod 31 rotation drive screw sleeve 30 rotation, at this time the screw sleeve 30 and threaded pipe 32 between the screw connection, that can drive the support cover 28 down, support cover 28 down, can extrude inserted into the soil or shale layer, so as to support and reinforce the tail end pipeline 19 and injection well pipe 4;

[0049] During the aforementioned gas drive process, before opening the storage tank outlet valve 7, storage tank check valve 8, canned pump inlet valve 10, canned pump outlet valve 13, canned pump check valve 14, plunger pump inlet valve 16, plunger pump outlet valve 18, plunger pump check valve 20, and well pipe inlet valve 21, the airtightness of the first end pipe 6, intermediate pipe 12, and tail end pipe 19 should be checked. At the same time, the canned pump 2 and plunger pump 3 should be checked. After confirming that there are no faults, the power should be turned on and the canned pump 2 and plunger pump 3 should be turned on, so that the plunger pump 3 and the gas injection well pipe 4 can run under no-load for 5-10 minutes. The first end pipe 6, intermediate pipe 12, and tail end pipe 19 should be vented to remove the gas from the outlets of the first end pipe 6, intermediate pipe 12, and tail end pipe 19.

[0050] Furthermore, for ease of understanding and description, this invention uses absolute positional relationships for description. Unless otherwise specified, the directional term "above" indicates... Figure 1 The direction above, the directional word "down" indicates Figure 1 The direction is below. This invention is described from the perspective of a user or reader, but the aforementioned directional terms should not be understood or interpreted as limiting the scope of protection of this invention. The circuits, electronic components, and modules involved in this invention are all prior art, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this application does not involve improvements to the software and methods.

[0051] The above description is merely a specific embodiment of the present invention and should not be construed as limiting the scope of the invention. Therefore, any substitution of equivalent components or equivalent changes and modifications made within the scope of protection of this patent should still fall within the scope of this patent. Furthermore, the technical features, technical solutions, and embodiments of the present invention can be freely combined and used together.

Claims

1. A device for carbon dioxide storage and injection in the exploitation of shale reservoirs, characterized in that, The device for storing and injecting carbon dioxide in shale reservoir exploitation comprises a carbon dioxide storage tank (1), a shield pump (2) and a plunger pump (3), the carbon dioxide storage tank (1) and the shield pump (2) are connected through a transmission pipeline, the shield pump (2) and the plunger pump (3) are also connected through a transmission pipeline, the transmission pipeline is also connected to the plunger pump outlet (17), and the transmission pipeline is provided with a temperature adjusting structure, which can adjust the temperature in the transmission pipeline. The temperature adjusting structure comprises an outer cover (22), a heating pipe (25) and a refrigeration pipe (26), the outer cover (22) is a cylindrical structure with closed two ends, the heating pipe (25) and the refrigeration pipe (26) are arranged in the outer cover (22), the heating pipe (25) can increase the temperature in the outer cover (22), and the refrigeration pipe (26) can decrease the temperature in the outer cover (22). The transmission pipeline is provided with a temperature sensor (39), the outer cover (22) is provided with a temperature control single-chip microcomputer (40), the output end of the temperature sensor (39) is electrically connected with the input end of the temperature control single-chip microcomputer (40), and the output end of the temperature control single-chip microcomputer (40) is electrically connected with the input end of the heating pipe (25) and the input end of the refrigeration pipe (26). The shield pump inlet (9) and the plunger pump inlet (15) are both provided with liquid sensors, the shield pump (2) and the plunger pump (3) are both provided with safety control single-chip microcomputers (38), the output end of the liquid sensor in the shield pump inlet (9) is electrically connected with the input end of the safety control single-chip microcomputer (38) on the shield pump (2), the output end of the safety control single-chip microcomputer (38) on the shield pump (2) is electrically connected with the input end of the shield pump (2), the output end of the liquid sensor in the plunger pump inlet (15) is electrically connected with the input end of the safety control single-chip microcomputer (38) on the plunger pump (3), and the output end of the safety control single-chip microcomputer (38) on the plunger pump (3) is electrically connected with the input end of the plunger pump (3).

2. The apparatus for carbon dioxide storage and injection in shale reservoir production according to claim 1, wherein, The outer cover (22) is provided with pipeline mounting through holes (27) at two ends, the axis of the heating pipe (25) and the axis of the refrigeration pipe (26) are parallel to the axis of the outer cover (22), and the heating pipe (25) and the refrigeration pipe (26) are alternately arranged along the circumference of the outer cover (22).

3. The apparatus for carbon dioxide storage and injection in shale reservoir production of claim 1, wherein, Along the circumference of the outer cover (22), the outer cover (22) comprises two half cover bodies arranged symmetrically, the edges of the two half cover bodies are provided with fixing plates (24), and the fixing plates (24) of the two half cover bodies are fixedly connected through bolts and nuts; the transmission pipeline is provided with two limiting plates (23), and the outer cover (22) is matched arranged between the two limiting plates (23).

4. The apparatus for carbon dioxide storage and injection in shale reservoir production of claim 1, wherein, The carbon dioxide storage tank (1), the shield pump (2) and the plunger pump (3) are connected with the transmission pipeline through a sealing connection structure (5), and the sealing connection structure (5) comprises a first flange (511) and a second flange (512), and the first flange (511) and the second flange (512) are fixedly connected through a screw rod (513).

5. The apparatus for carbon dioxide storage and injection in shale reservoir production according to claim 4, wherein, The end face of the first flange (511) towards the second flange (512) is provided with a first sealing convex ring (517) and a first sealing groove (515), the axis of the first sealing convex ring (517) and the axis of the first sealing groove (515) are coincident with the axis of the first flange (511), the end face of the second flange (512) towards the first flange (511) is provided with a second sealing convex ring (514) and a second sealing groove (518), the first sealing convex ring (517) is inserted into the second sealing groove (518), and a sealing rubber gasket (516) is arranged between the first sealing convex ring (517) and the second sealing groove (518), the second sealing convex ring (514) is inserted into the first sealing groove (515), and a sealing rubber gasket (516) is arranged between the second sealing convex ring (514) and the first sealing groove (515).

6. The apparatus for carbon dioxide storage and injection in shale reservoir production of claim 1, wherein, The transmission pipeline connected to the outlet of the plunger pump is a tail-end pipeline (19), the outlet of the tail-end pipeline (19) is connected to the inlet of the gas injection well pipe (4), and a protection structure is arranged outside the outlet of the tail-end pipeline (19), which can support and reinforce the outlet of the tail-end pipeline (19) and the inlet of the gas injection well pipe (4).

7. The apparatus for carbon dioxide storage and injection in shale reservoir production according to claim 6, wherein, The protection structure comprises a threaded pipe (32), a threaded sleeve (30) and a support cover (28) which are sequentially sleeved from inside to outside, the threaded pipe (32) is fixedly sleeved outside the outlet of the tail-end pipeline (19), the outlet of the tail-end pipeline (19) is in an upright state, the threaded pipe (32) is threadedly connected with the threaded sleeve (30), the threaded sleeve (30) and the support cover (28) are connected and fixed through a fixing rod (31), a handle (29) is fixed outside the support cover (28), a sealing cover plate (41) is sleeved outside the inlet of the gas injection well pipe (4), the lower end surface of the threaded pipe (32) is inclined relative to the axis of the threaded pipe (32), when the support cover (28) is screwed, the support cover (28) can move up and down, and the lower end of the support cover (28) can be lower than the lower end surface of the sealing cover plate (41).

8. A method of using a carbon dioxide storage and injection device in the exploitation of a shale reservoir, characterized in that, The use method of the carbon dioxide storage and injection device in shale reservoir exploitation adopts the carbon dioxide storage and injection device in shale reservoir exploitation of claim 1, and comprises the following steps: When the temperature in the transmission pipeline is lower than a set value, the temperature adjusting structure heats the transmission pipeline; and when the temperature in the transmission pipeline is higher than a set value, the temperature adjusting structure cools the transmission pipeline.

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