Carbon dioxide geological storage injection device and construction method

Abstract

The present invention discloses a carbon dioxide geological storage injection device and a construction method, belonging to the technical field of carbon dioxide storage. The carbon dioxide geological storage injection device comprises: an injection pipe, an energy extractor and a pump body. An injection channel is provided in the injection pipe, and the injection channel is connected with an injection hole and a first exhaust hole arranged up and down; the energy extractor is connected to the injection pipe, arranged in the injection channel and located between the injection hole and the first exhaust hole, and is configured to extract kinetic energy of the gas flowing through the injection channel; the pump body is connected to the lower end of the injection pipe and connected to the energy extractor, and the energy extractor can drive the pump body to operate. The pump body is configured to pump liquid at the lower end of the injection pipe into the carbon dioxide reservoir above the first exhaust hole, and can simultaneously realize gas injection and water injection, and utilize the water circulation of the storage area to improve the carbon dioxide storage effect, which is conducive to reducing the number of pipelines arranged and reducing the construction difficulty.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide sequestration, and in particular to a carbon dioxide geological sequestration injection device and a construction method. Background Art

[0002] Carbon dioxide storage technology captures and stores carbon dioxide in reservoirs to reduce CO2 emissions. Because CO2 has a lower density than the liquid within the reservoir, when injected into a high-permeability underground reservoir, it spontaneously accumulates in the upper reservoir due to buoyancy, forming a funnel-shaped distribution with a larger top and smaller bottom, which is not conducive to improving reservoir utilization. Water injection is a method that accelerates CO2 dissolution and improves storage safety. It also inhibits lateral diffusion of CO2 below the reservoir, thereby improving reservoir utilization.

[0003] In related technologies, water sources for injecting water into reservoirs generally need to rely on surface transportation, and the number of pipelines arranged is large, making construction relatively inconvenient. Summary of the Invention

[0004] The present invention aims to address at least one of the technical problems existing in the prior art. To this end, it proposes a carbon dioxide geological storage injection device capable of simultaneously injecting gas and water, utilizing water circulation within the storage area to enhance carbon dioxide storage efficiency, thereby reducing the number of pipelines required and simplifying construction.

[0005] The invention also provides a construction method.

[0006] According to an embodiment of the first aspect of the present invention, a carbon dioxide geological storage injection device includes: an injection pipe having an injection channel provided therein, the injection channel communicating with an injection hole and a first exhaust hole arranged vertically therefrom; an energy extractor connected to the injection pipe, disposed in the injection channel and located between the injection hole and the first exhaust hole, and configured to extract kinetic energy of the gas flowing through the injection channel; a pump body connected to the lower end of the injection pipe and to the energy extractor, the energy extractor being capable of driving the pump body to operate, and the pump body being configured to pump liquid from the lower end of the injection pipe into the carbon dioxide reservoir above the first exhaust hole.

[0007] The carbon dioxide geological storage injection device according to the embodiment of the present invention has at least the following beneficial effects: the carbon dioxide geological storage injection device is applied to a construction well located in the storage site, an injection channel is provided in the injection pipe, the injection channel is connected with an injection hole and a first exhaust hole arranged up and down, the captured carbon dioxide gas can be passed into the injection channel from the injection hole, the energy extractor is connected to the injection pipe, the energy extractor is provided in the injection channel and is located between the injection hole and the first exhaust hole, so that the carbon dioxide gas can pass through the energy extractor, the energy extractor is configured to extract the kinetic energy of the gas flowing through the injection channel, and the carbon dioxide can be injected into the carbon dioxide reservoir from the first exhaust hole after flowing through the injection channel, the energy extractor is connected to the pump body in a transmission manner, the energy extractor can drive the pump body to operate, and the pump body is configured to inject The liquid at the lower end of the inlet pipe is pumped into the carbon dioxide reservoir above the first exhaust hole. Since the liquid has a tendency to penetrate downward, while the carbon dioxide gas has a tendency to gather upward, it is beneficial to increase the contact area between the liquid and the carbon dioxide. The carbon dioxide geological storage injection device utilizes the water circulation of the storage area and does not require the transportation of surface water sources, which is beneficial to accelerate the dissolution of carbon dioxide and improve the storage safety. It can also inhibit the lateral diffusion of carbon dioxide below the carbon dioxide reservoir and improve the utilization rate of the carbon dioxide reservoir. The carbon dioxide geological storage injection device utilizes the kinetic energy of carbon dioxide injection so that the energy extractor can drive the pump body to operate to realize the extraction of liquid, and uses the same injection pipe to realize water injection and gas injection at the same time, which is beneficial to reduce the number of pipeline arrangements and reduce the difficulty of construction.

[0008] According to some embodiments of the present invention, the carbon dioxide geological storage injection device further includes a transmission shaft, the energy extractor is a turbine motor, the upper end of the transmission shaft is connected to the turbine motor, and the lower end of the transmission shaft is connected to the pump body.

[0009] Specifically, the carbon dioxide geological storage injection device also includes a transmission shaft, the energy extractor is a turbine motor, the two ends of the transmission shaft are arranged up and down, the upper end and the lower end of the transmission shaft are connected to the turbine motor and the pump body respectively. When the carbon dioxide gas flows through the injection channel, it can drive the turbine of the turbine motor to rotate, that is, drive the turbine motor to operate. Under the transmission action of the transmission shaft, the kinetic energy obtained by the turbine motor is transmitted to the pump body. Under the pressure change action of the pump body, the liquid at the lower end of the injection pipe is pumped into the carbon dioxide reservoir above the first exhaust hole. Since the liquid has a tendency to penetrate downward and the carbon dioxide gas has a tendency to gather upward, it is beneficial to increase the contact area between the liquid and the carbon dioxide. The carbon dioxide geological storage injection device utilizes the water circulation of the storage area and does not require the transportation of surface water sources. It is beneficial to accelerate the dissolution of carbon dioxide and improve the storage safety. It can also inhibit the lateral diffusion of carbon dioxide below the carbon dioxide reservoir and improve the utilization rate of the carbon dioxide reservoir.

[0010] According to some embodiments of the present invention, the carbon dioxide geological storage injection device also includes a connecting block connected to the inner wall of the injection channel, the drive shaft is provided with an injection channel extending up and down, the pump body is connected to the lower end of the water injection channel, the drive shaft is rotatably connected to the connecting block, the injection pipe has a first drainage hole located above the first exhaust hole, and the connecting block has a drainage channel connected to the upper end of the water injection channel and the first drainage hole.

[0011] Specifically, the carbon dioxide geological storage injection device also includes a connecting block, which is connected to the inner wall of the injection channel, and the transmission shaft is rotatably connected to the connecting block. The connecting block can provide support for the transmission of the transmission shaft and improve the positioning accuracy of the transmission shaft and the injection pipe. The transmission shaft is provided with an injection channel extending up and down, and the pump body is connected to the lower end of the water injection channel. After the pump body is operated, under the pressure change of the pump body, the liquid at the lower end of the injection pipe can be drawn into the water injection channel. The injection pipe has a first drainage hole located above the first exhaust hole, and the connecting block has a connection with the upper end of the water injection channel and the first drainage hole. The connected drainage channel, under the pressure-increasing action of the pump body, allows the liquid to pass through the water injection channel and the drainage channel in sequence and then be injected into the carbon dioxide reservoir from the first drainage hole. Since the liquid has a tendency to penetrate downward, while the carbon dioxide gas has a tendency to gather upward, it is beneficial to increase the contact area between the liquid and the carbon dioxide. The carbon dioxide geological storage injection device utilizes the water circulation of the storage area and does not require the transportation of surface water sources. It is beneficial to accelerate the dissolution of carbon dioxide and improve the storage safety. It can also inhibit the lateral diffusion of carbon dioxide below the carbon dioxide reservoir and improve the utilization rate of the carbon dioxide reservoir.

[0012] According to some embodiments of the present invention, the outer peripheral wall of the connecting block is connected to the inner peripheral wall of the injection channel, the connecting block is located above the turbine motor, and the connecting block has an air vent opposite to the turbine motor; and / or,

[0013] The carbon dioxide geological storage injection device also includes a threaded joint, which is connected to the upper end of the injection pipe, and the injection hole is arranged on the threaded joint.

[0014] Optionally, the outer circumferential wall of the connecting block is connected to the inner circumferential wall of the injection channel to achieve a fixed connection between the connecting block and the injection channel. The connecting block is located above the turbine motor, and the connecting block has an air vent opposite to the turbine motor. The setting of the air vent can pressurize the carbon dioxide passing through the air vent, so that the formed high-pressure and high-flow-rate carbon dioxide flows to the energy extractor, which is beneficial to improving the kinetic energy obtained by the energy extractor to achieve effective driving of the pump body; optionally, the carbon dioxide geological storage injection device also includes a threaded joint, which is connected to the upper end of the injection pipe, and the injection hole is provided at the threaded joint. The threaded joint is used to communicate with the external gas pipeline to achieve carbon dioxide injection, and the threaded connection between the threaded joint and the external gas pipeline is beneficial to improving the connection stability between the carbon dioxide geological storage injection device and the external gas pipeline.

[0015] According to some embodiments of the present invention, the carbon dioxide geological storage injection device also includes a first sealing member and a second sealing member. The first sealing member and the second sealing member are arranged up and down and are both sleeved on the outer circumference of the injection pipe. The first sealing member and the second sealing member are respectively located above and below the first exhaust hole.

[0016] Specifically, the carbon dioxide geological storage injection device also includes a first sealing member and a second sealing member. The carbon dioxide geological storage injection device can be inserted into a construction well located at the storage site. The first sealing member and the second sealing member are arranged up and down and are both located between the outer periphery of the injection pipe and the inner periphery of the construction well. The first sealing member and the second sealing member are respectively located above and below the first exhaust hole. The first sealing member, the second sealing member, the outer peripheral wall of the injection pipe and the inner peripheral wall of the construction well jointly define an exhaust chamber. The setting of the exhaust chamber is conducive to controlling the area of ​​carbon dioxide gas emission and improving the storage safety of carbon dioxide.

[0017] According to some embodiments of the present invention, the carbon dioxide geological storage injection device also includes a third sealing member, which is sleeved on the outer periphery of the injection pipe and located above the first sealing member. The third sealing member and the first sealing member are respectively located above and below the first drainage hole.

[0018] Specifically, the carbon dioxide geological storage injection device also includes a third sealing member, which is sleeved on the outer periphery of the injection pipe and located above the first sealing member. The third sealing member, the first sealing member, the outer peripheral wall of the injection pipe and the inner peripheral wall of the construction well jointly define a drainage chamber. The setting of the drainage chamber is conducive to controlling the water injection area, accelerating the dissolution of carbon dioxide and improving the storage safety, and inhibiting the lateral diffusion of carbon dioxide below the carbon dioxide reservoir. That is, the third sealing member, the first sealing member and the second sealing member are arranged in sequence from top to bottom, thereby dividing the space between the injection pipe and the construction well into four independent chambers to meet the needs of gas injection and water injection, which is conducive to avoiding the problem of carbon dioxide seeping upward or escaping from the space between the injection pipe and the construction well.

[0019] According to a construction method of an embodiment of the second aspect of the present invention, using any of the carbon dioxide geological storage injection devices of the first aspect, the construction method includes:

[0020] Drilling branch wells or horizontal wells in the predetermined storage area, extending the branch wells or horizontal wells to the water extraction layer of the storage area;

[0021] Establish a construction well at a preset location in the storage area, so that the construction well penetrates the carbon dioxide reservoir and the water intake layer, and a second exhaust hole is opened at the construction well corresponding to the carbon dioxide reservoir;

[0022] Insert the injection pipe into the construction well to connect the first exhaust hole with the second exhaust hole.

[0023] The construction method according to the embodiment of the present invention has at least the following beneficial effects: after selecting a storage site, construction personnel can drill branch wells or horizontal wells in the preset storage site, so that the branch wells or horizontal wells extend to the water intake layer of the storage site, that is, the flow of liquid in the storage site is controlled by the arrangement of the branch wells or horizontal wells, and then establish a construction well at a preset position in the storage site, so that the construction well is arranged through the carbon dioxide reservoir and the water intake layer, and a second exhaust hole is opened in the construction well corresponding to the carbon dioxide reservoir, and an injection pipe is inserted into the construction well so that the first exhaust hole is opposite to the carbon dioxide reservoir and connected to the second exhaust hole. In order to achieve the coordination between the carbon dioxide geological storage injection device and the construction well, through the operation of the carbon dioxide geological storage injection device, the water circulation of the storage site itself can be utilized, and there is no need for the transportation of surface water sources, which is conducive to accelerating the dissolution of carbon dioxide and improving the safety of storage. It can also inhibit the lateral diffusion of carbon dioxide below the carbon dioxide reservoir and improve the utilization rate of the carbon dioxide reservoir. This construction method uses the kinetic energy of carbon dioxide injection to enable the energy extractor to drive the pump body to operate to realize liquid extraction and injection, and uses the same injection pipe to realize water injection and gas injection at the same time, which is conducive to reducing the number of pipeline layouts and reducing construction difficulty.

[0024] According to some embodiments of the present invention, the construction method further comprises:

[0025] Inject carbon dioxide gas into the injection hole, so that the carbon dioxide gas flows through the energy extractor and flows out from the first exhaust hole. The energy extractor drives the pump body to operate to pump the liquid in the water extraction layer into the carbon dioxide reservoir above the first exhaust hole.

[0026] An injection channel is provided in the injection pipe, and the injection channel is connected with an injection hole and a first exhaust hole arranged above and below. The captured carbon dioxide gas can be passed into the injection channel from the injection hole. The energy extractor is connected to the injection pipe. The energy extractor is provided in the injection channel and is located between the injection hole and the first exhaust hole so that the carbon dioxide gas can pass through the energy extractor. The energy extractor is configured to extract the kinetic energy of the gas flowing through the injection channel. After the carbon dioxide flows through the injection channel, it passes through the first exhaust hole and the second exhaust hole in sequence to be injected into the carbon dioxide reservoir. The energy extractor is connected to the pump body in a transmission manner. The energy extractor can drive the pump body to operate. The pump body is configured to pump the liquid at the lower end of the injection pipe into the two exhaust holes above the first exhaust hole. In the carbon dioxide reservoir, since the liquid has a tendency to penetrate downward, while the carbon dioxide gas has a tendency to gather upward, it is beneficial to increase the contact area between the liquid and the carbon dioxide. This construction method utilizes the water circulation of the storage site itself and does not rely on the transportation of surface water sources. It is beneficial to accelerate the dissolution of carbon dioxide and improve the safety of storage. It can also inhibit the lateral diffusion of carbon dioxide below the carbon dioxide reservoir and improve the utilization rate of the carbon dioxide reservoir. This construction method uses the kinetic energy of carbon dioxide injection to enable the energy extractor to drive the pump body to operate to realize the extraction of liquid, and uses the same injection pipe to realize water injection and gas injection at the same time, which is beneficial to reduce the number of pipeline layouts and reduce the difficulty of construction.

[0027] According to some embodiments of the present invention, the carbon dioxide geological storage injection device further includes a first sealing member and a second sealing member arranged vertically, and the construction method further includes:

[0028] The second sealing member and the first sealing member are placed between the injection pipe and the construction well, so that the first sealing member, the second sealing member, the outer peripheral wall of the injection pipe and the inner peripheral wall of the construction well jointly define an exhaust chamber, and the exhaust chamber is connected to the first exhaust hole and the second exhaust hole.

[0029] Specifically, the carbon dioxide geological storage injection device also includes a first sealing member and a second sealing member. The carbon dioxide geological storage injection device can be inserted into a construction well located at the storage site. The first sealing member and the second sealing member are arranged up and down and are both located between the outer periphery of the injection pipe and the inner periphery of the construction well. The first sealing member and the second sealing member are respectively located above and below the first exhaust hole. The first sealing member, the second sealing member, the outer peripheral wall of the injection pipe and the inner peripheral wall of the construction well jointly define an exhaust chamber. The carbon dioxide gas flows through the injection channel, the first exhaust hole, the exhaust chamber and the second exhaust hole in sequence, so that the carbon dioxide gas is injected into the carbon dioxide reservoir. The setting of the exhaust chamber is conducive to controlling the area of ​​carbon dioxide gas emission and improving the storage safety of carbon dioxide.

[0030] According to some embodiments of the present invention, the carbon dioxide geological storage injection device further includes a third sealing member, the injection pipe is provided with a first drainage hole connected to the pump body, and the construction method further includes:

[0031] A second drainage hole is opened above the second exhaust hole corresponding to the construction well;

[0032] The third sealing member is placed between the injection pipe and the construction well, so that the third sealing member, the first sealing member, the outer peripheral wall of the injection pipe and the inner peripheral wall of the construction well jointly define a drainage chamber, and the drainage chamber is connected to the first drainage hole and the second drainage hole.

[0033] Specifically, the carbon dioxide geological storage injection device also includes a third sealing member, which is sleeved on the outer periphery of the injection pipe and located above the first sealing member. The third sealing member, the first sealing member, the outer peripheral wall of the injection pipe and the inner peripheral wall of the construction well jointly define a drainage chamber. Under the variable pressure of the pump body, the liquid passes through the first drainage hole, the drainage chamber and the second drainage hole in sequence, so that the liquid is injected into the carbon dioxide reservoir above the first exhaust hole. The setting of the drainage chamber is conducive to controlling the water injection area, accelerating the dissolution of carbon dioxide and improving the storage safety, and inhibiting the lateral diffusion of carbon dioxide below the carbon dioxide reservoir. That is, the third sealing member, the first sealing member and the second sealing member are arranged in sequence from top to bottom, thereby dividing the space between the injection pipe and the construction well into four independent chambers to meet the needs of gas injection and water injection, which is conducive to avoiding the problem of carbon dioxide seeping upward or escaping from the space between the injection pipe and the construction well.

[0034] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0036] Figure 1 This is a structural schematic diagram of a carbon dioxide geological storage injection device installed at a storage site according to an embodiment of the present invention;

[0037] Figure 2 This is a schematic structural diagram of a carbon dioxide geological storage and injection device according to an embodiment of the present invention;

[0038] Figure 3 A flowchart of a construction method according to an embodiment of the present invention;

[0039] Figure 4 The present invention is a flowchart of a construction method for installing a first sealing member, a second sealing member, and a third sealing member according to an embodiment of the present invention.

[0040] Figure Number:

[0041] 100, injection pipe; 110, injection channel; 111, injection hole; 112, first exhaust hole; 113, first drainage hole;

[0042] 200, energy taker;

[0043] 300, pump body; 310, boost inlet; 320, boost outlet;

[0044] 400, transmission shaft; 410, water injection channel;

[0045] 500, connecting block; 510, drainage channel;

[0046] 600, threaded joint;

[0047] 710, first sealing member; 720, second sealing member; 730, third sealing member;

[0048] 800, construction well; 810, second exhaust hole; 820, second drainage hole;

[0049] 910, exhaust chamber; 920, drainage chamber;

[0050] 1000, branch well;

[0051] 1100. Carbon dioxide reservoir. DETAILED DESCRIPTION

[0052] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0053] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0054] In the description of the present invention, "a plurality" refers to more than two. The use of "first" or "second" is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of the indicated technical features, or implicitly indicating the order of the indicated technical features.

[0055] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0056] Reference Figure 1 and Figure 2 As shown, a carbon dioxide geological storage injection device according to one embodiment of the present invention is applied to a construction well 800 at a storage site. The device can be plugged into the construction well 800 to inject carbon dioxide. Specifically, the device includes an injection pipe 100, an energy extractor 200, and a pump body 300.

[0057] Reference Figure 1 and Figure 2 As shown, the two ends of the injection pipe 100 are arranged in the up and down direction, and an injection channel 110 is provided in the injection pipe 100. The injection channel 110 is connected with an injection hole 111 and a first exhaust hole 112. The captured carbon dioxide gas can be passed into the injection channel 110 from the injection hole 111. After the carbon dioxide gas flows through the injection channel 110, it can be injected into the carbon dioxide reservoir 1100 from the first exhaust hole 112 to realize the storage of carbon dioxide.

[0058] Reference Figure 1 and Figure 2 As shown, the energy extractor 200 is movably connected to the inner wall of the injection pipe 100. The energy extractor 200 is arranged in the injection channel 110 and is located between the injection hole 111 and the first exhaust hole 112, so that carbon dioxide gas can pass through the energy extractor 200. The energy extractor 200 is configured to extract the kinetic energy of the gas flowing through the injection channel 110.

[0059] Reference Figure 1 and Figure 2 As shown, the pump body 300 is connected to the lower end of the injection pipe 100 and to the energy extractor 200. The energy extractor 200 can transfer the obtained kinetic energy to the pump body 300, that is, the energy extractor 200 can drive the pump body 300 to operate. The pump body 300 is configured to pump the liquid at the lower end of the injection pipe 100 into the carbon dioxide reservoir 1100 above the first exhaust hole 112. Since the liquid has a tendency to penetrate downward and the carbon dioxide gas has a tendency to gather upward, it is beneficial to increase the contact area between the liquid and the carbon dioxide. The carbon dioxide geological storage injection device utilizes the water circulation of the storage area and does not need to rely on the transportation of surface water sources. It is beneficial to accelerate the dissolution of carbon dioxide and improve the storage safety. It can also inhibit the lateral diffusion of carbon dioxide below the carbon dioxide reservoir 1100, thereby improving the utilization rate of the carbon dioxide reservoir 1100.

[0060] Reference Figure 1 and Figure 2 As shown, the carbon dioxide geological storage injection device uses the kinetic energy of carbon dioxide injection to enable the energy extractor 200 to drive the pump body 300 to operate to achieve liquid extraction and injection. The same injection pipe 100 is used to simultaneously achieve water injection and gas injection, which is beneficial to reduce the number of pipeline arrangements and reduce construction difficulty.

[0061] Compared with the carbon dioxide storage device that transports water from the surface, the carbon dioxide geological storage injection device provided by the embodiment of the present invention can realize the extraction of the lower saline water layer, gas injection in the middle saline water layer, and synchronous water injection at the top, thereby realizing the circulation of saline water inside the storage area, increasing the dissolution rate of carbon dioxide, improving the storage safety of carbon dioxide, and being conducive to controlling the flow range of carbon dioxide in the reservoir, improving the reservoir utilization rate, realizing the function of top water injection, suppressing the lateral movement range of the plume at the top, and improving the storage capacity of the storage area.

[0062] Reference Figure 1 and Figure 2 As shown, it can be understood that the carbon dioxide geological storage injection device also includes a transmission shaft 400, the energy extractor 200 is a turbine motor, the upper end of the transmission shaft 400 is connected to the turbine motor, and the lower end of the transmission shaft 400 is connected to the pump body 300.

[0063] Reference Figure 1 and Figure 2 As shown, the turbine motor includes a turbine and a first housing, the turbine being rotatably connected to the first housing. The pump body 300 includes an impeller and a second housing, the impeller being rotatably connected to the second housing. The upper end of the transmission shaft 400 is coaxially disposed and fixedly connected to the turbine, and the lower end of the transmission shaft 400 is coaxially disposed and fixedly connected to the impeller.

[0064] Reference Figure 1 and Figure 2 As shown, when the carbon dioxide gas flows through the injection channel 110, it can drive the turbine of the turbine motor to rotate, that is, drive the turbine motor to operate. Under the transmission action of the transmission shaft 400, the kinetic energy obtained by the turbine motor is transmitted to the pump body 300. Under the pressure change action of the pump body 300, the liquid at the lower end of the injection pipe 100 is pumped into the carbon dioxide reservoir 1100 above the first exhaust hole 112. Since the liquid has a tendency to penetrate downward and the carbon dioxide gas has a tendency to gather upward, it is beneficial to increase the contact area between the liquid and the carbon dioxide. The carbon dioxide geological storage injection device utilizes the water circulation of the storage area and does not require the transportation of surface water sources. It is beneficial to accelerate the dissolution of carbon dioxide and improve the storage safety. It can also inhibit the lateral diffusion of carbon dioxide below the carbon dioxide reservoir 1100, thereby improving the utilization rate of the carbon dioxide reservoir 1100.

[0065] Reference Figure 1 and Figure 2As shown, it can be understood that the carbon dioxide geological storage injection device also includes a connecting block 500 connected to the inner wall of the injection channel 110, the drive shaft 400 is provided with an injection channel 410 extending up and down, the pump body 300 is connected to the lower end of the injection channel 410, the drive shaft 400 is rotatably connected to the connecting block 500, the drive shaft 400 and the connecting block 500 are dynamically sealed, the injection pipe 100 has a first drainage hole 113 located above the first exhaust hole 112, and the connecting block 500 has a drainage channel 510 connected to the upper end of the injection channel 410 and the first drainage hole 113.

[0066] Reference Figure 1 and Figure 2 As shown, the connecting block 500 can provide support for the transmission of the transmission shaft 400 and improve the positioning accuracy of the transmission shaft 400 and the injection pipe 100. The transmission shaft 400 is provided with an injection channel 110 extending up and down.

[0067] Specifically, the pump body 300 is a booster pump, and the impeller of the booster pump and the second shell together define a booster cavity, and the booster cavity is connected to a booster inlet 310 and a booster outlet 320, wherein the booster inlet 310 is open downward to enable the extraction of liquid below, and the booster outlet 320 is connected to the lower end of the water injection channel 410. Under the transmission action of the drive shaft 400, the impeller of the booster pump rotates, thereby causing the booster inlet 310 to generate attraction, so that the liquid in the water-taking layer of the sealed area is sucked into the booster cavity from the booster inlet 310, and under the boosting action of the booster pump, the liquid is passed from the booster outlet 320 into the water injection channel 410.

[0068] Reference Figure 1 and Figure 2 As shown, after the pump body 300 is in operation, the liquid at the lower end of the injection pipe 100 can be drawn into the water injection channel 410 under the variable pressure of the pump body 300. The injection pipe 100 has a first drainage hole 113 located above the first exhaust hole 112. The connecting block 500 has a drainage channel 510 connected to the upper end of the water injection channel 410 and the first drainage hole 113. Under the pressurization of the pump body 300, the liquid passes through the water injection channel 410 and the drainage channel in sequence and is injected into the carbon dioxide reservoir 1100 from the first drainage hole 113. Since the liquid has a tendency to permeate downward and the carbon dioxide gas has a tendency to gather upward, the contact area between the liquid and the carbon dioxide is increased. The carbon dioxide geological storage injection device utilizes the water circulation of the storage area and does not require the transportation of surface water sources. This is conducive to accelerating the dissolution of carbon dioxide and improving the storage safety. It can also inhibit the lateral diffusion of carbon dioxide below the carbon dioxide reservoir 1100, thereby improving the utilization rate of the carbon dioxide reservoir 1100.

[0069] Reference Figure 1 and Figure 2As shown, it can be understood that the outer peripheral wall of the connecting block 500 is connected to the inner peripheral wall of the injection channel 110, the connecting block 500 is located above the turbine motor, and the connecting block 500 has an air vent opposite to the turbine motor.

[0070] Reference Figure 1 and Figure 2 As shown, the provision of the air holes can pressurize the carbon dioxide passing therethrough, so that the formed high-pressure and high-flow carbon dioxide flows toward the energy extractor 200 , which is beneficial to increasing the kinetic energy obtained by the energy extractor 200 to achieve effective driving of the pump body 300 .

[0071] It should be understood that, in some other embodiments, the carbon dioxide geological storage injection device further includes a booster, which is configured to boost the pressure of the gas entering the injection channel 110 so that the formed high-pressure and high-flow-rate carbon dioxide flows toward the energy extractor 200, thereby increasing the kinetic energy obtained by the energy extractor 200 and achieving effective driving of the pump body 300.

[0072] Reference Figure 1 and Figure 2 As shown, it is understood that, in this embodiment, the carbon dioxide geological storage injection device further includes a threaded joint 600, which is connected to the upper end of the injection pipe 100, and the injection hole 111 is provided on the threaded joint 600.

[0073] Reference Figure 1 and Figure 2 As shown, the threaded joint 600 is used to communicate with an external gas pipeline to achieve carbon dioxide injection. The threaded connection between the threaded joint 600 and the external gas pipeline is beneficial to improving the connection stability between the carbon dioxide geological storage injection device and the external gas pipeline.

[0074] Reference Figure 1 and Figure 2 As shown, the outer edge of the threaded joint 600 is connected to the inner circumferential wall of the injection pipe 100. The threaded joint 600 can be used as an upper cover of the injection channel 110. The threaded joint 600 is in the shape of a truncated cone that gradually narrows from bottom to top.

[0075] Reference Figure 1 and Figure 2 As shown, specifically, the outer periphery of the threaded joint 600 is provided with an external thread section, which can be threadedly connected to the internal thread section provided on the gas pipeline, thereby achieving a fixed connection between the injection pipe 100 and the external gas pipeline.

[0076] Reference Figure 1 and Figure 2As shown, it can be understood that the carbon dioxide geological storage injection device also includes a first sealing member 710 and a second sealing member 720. The first sealing member 710 and the second sealing member 720 are arranged up and down and are both sleeved on the outer periphery of the injection pipe 100. The first sealing member 710 and the second sealing member 720 are respectively located above and below the first exhaust hole 112.

[0077] Reference Figure 1 and Figure 2 As shown, the first and second packing members 710, 720 can be arranged in an annular shape and sleeved around the outer circumference of the injection pipe 100. This carbon dioxide geological storage injection device can be used in a construction well 800 located at the storage site. The first and second packing members 710, 720 are located between the injection pipe 100 and the construction well 800. The inner circumferences of the first and second packing members 710, 720 abut against the injection pipe 100, while the outer circumferences of the first and second packing members 710, 720 abut against the construction well 800. A plurality of first exhaust holes 112 can be provided, and the plurality of first exhaust holes 112 are arranged circumferentially and spaced apart to improve the efficiency of carbon dioxide injection.

[0078] Reference Figure 1 and Figure 2 As shown, the first sealing member 710, the second sealing member 720, the outer peripheral wall of the injection pipe 100 and the inner peripheral wall of the construction well 800 jointly define the exhaust chamber 910. The setting of the exhaust chamber 910 is conducive to controlling the area of ​​carbon dioxide gas emission and improving the storage safety of carbon dioxide.

[0079] Reference Figure 1 and Figure 2 As shown, it can be understood that the carbon dioxide geological storage injection device also includes a third sealing member 730, which is sleeved on the outer periphery of the injection pipe 100 and located above the first sealing member 710. The third sealing member 730 and the first sealing member 710 are respectively located above and below the first drainage hole 113.

[0080] Reference Figure 1 and Figure 2 As shown, the third sealing member 730 can be arranged in an annular shape and sleeved on the outer periphery of the injection pipe 100. The carbon dioxide geological storage injection device can be used in a construction well 800 located at the storage site. The third sealing member 730 is located between the injection pipe 100 and the construction well 800. The inner periphery of the third sealing member 730 abuts against the injection pipe 100, and the outer periphery of the third sealing member 730 abuts against the construction well 800.

[0081] A plurality of first drainage holes 113 may be provided, and the plurality of first drainage holes 113 are arranged at intervals in a circumferential manner to improve the efficiency of liquid injection.

[0082] Reference Figure 1 and Figure 2 As shown, the third sealing member 730, the first sealing member 710, the outer peripheral wall of the injection pipe 100 and the inner peripheral wall of the construction well 800 jointly define the drainage chamber 920. The setting of the drainage chamber is conducive to controlling the water injection area, accelerating the dissolution of carbon dioxide and improving the storage safety, and inhibiting the lateral diffusion of carbon dioxide below the carbon dioxide reservoir 1100.

[0083] That is, the third sealing member 730, the first sealing member 710 and the second sealing member 720 are arranged in sequence from top to bottom, thereby dividing the space between the injection pipe 100 and the construction well 800 into four independent chambers, corresponding to the wellhead section, water injection section, gas injection section and pumping section respectively, to meet the needs of gas injection and water injection, which is conducive to avoiding the problem of carbon dioxide infiltrating or escaping upward from the space between the injection pipe 100 and the construction well 800.

[0084] Reference Figures 1 to 4 As shown, a construction method according to an embodiment of the present invention is applied to the carbon dioxide geological storage injection device according to any of the above embodiments. The construction method comprises the following steps:

[0085] Step S100: drilling a branch well 1000 or a horizontal well in a predetermined storage area, extending the branch well 1000 or the horizontal well to the water extraction layer of the storage area;

[0086] Step S200: Establishing a construction well 800 at a preset location in the storage area, so that the construction well 800 penetrates the carbon dioxide reservoir 1100 and the water intake layer, and a second exhaust hole 810 is opened in the construction well 800 corresponding to the carbon dioxide reservoir 1100;

[0087] Step S300: insert the injection pipe 100 into the construction well 800 to connect the first exhaust hole 112 with the second exhaust hole 810;

[0088] In step S400 , carbon dioxide gas is injected into the injection hole 111 , causing the carbon dioxide gas to flow through the energy extractor 200 and out of the first exhaust hole 112 . The energy extractor 200 drives the pump body 300 to operate, thereby pumping liquid from the water extraction layer into the carbon dioxide reservoir 1100 above the first exhaust hole 112 .

[0089] Reference Figure 1 、 Figure 2 and Figure 3 As shown, in step S100, after selecting the storage site, the construction personnel can drill a branch well 1000 or a horizontal well in the preset storage site, so that the branch well 1000 or the horizontal well extends to the water intake layer of the storage site, that is, the flow of liquid in the storage site is controlled through the branch well 1000 or the horizontal well.

[0090] Reference Figure 1 、 Figure 2and Figure 3 As shown, in step S200 and step S300, a construction well 800 is then established at a preset position in the storage site, so that the construction well 800 is penetrated through the carbon dioxide reservoir 1100 and the water intake layer, and a second exhaust hole 810 is opened in the construction well 800 corresponding to the carbon dioxide reservoir 1100, and the injection pipe 100 is penetrated into the construction well 800, so that the first exhaust hole 112 is opposite to the carbon dioxide reservoir 1100 and connected to the second exhaust hole 810, so as to realize the coordination between the carbon dioxide geological storage injection device and the construction well 800.

[0091] Reference Figure 1 、 Figure 2 and Figure 3 As shown, through the operation of the carbon dioxide geological storage injection device, the water circulation of the storage area can be utilized, which is beneficial to accelerate the dissolution of carbon dioxide and improve the storage safety. It can also inhibit the lateral diffusion of carbon dioxide below the carbon dioxide reservoir 1100 and improve the utilization rate of the carbon dioxide reservoir 1100. The construction method uses the kinetic energy of carbon dioxide injection to enable the energy extractor 200 to drive the pump body 300 to operate to realize liquid extraction and injection, and uses the same injection pipe 100 to realize water injection and gas injection at the same time, which is beneficial to reduce the number of pipeline arrangements and reduce construction difficulty.

[0092] Reference Figure 1 、 Figure 2 and Figure 3 As shown, in step S400, specifically, when the construction personnel drive the carbon dioxide geological storage injection device to operate, the captured carbon dioxide gas can be passed into the injection channel 110 from the injection hole 111, and the energy extractor 200 is connected to the injection pipe 100. The energy extractor 200 is arranged in the injection channel 110 and is located between the injection hole 111 and the first exhaust hole 112, so that the carbon dioxide gas can pass through the energy extractor 200. The energy extractor 200 is configured to extract the kinetic energy of the gas flowing through the injection channel 110. After flowing through the injection channel 110, the carbon dioxide can be injected into the carbon dioxide reservoir 1100 from the first exhaust hole 112. The energy extractor 200 is transmission-connected to the pump body 300. The energy extractor 200 can drive the pump body 300 to operate. The pump body 300 is configured to pump the liquid at the lower end of the injection pipe 100 into the carbon dioxide reservoir 1100 above the first exhaust hole 112. Since the liquid has a tendency to penetrate downward, and the carbon dioxide gas has a tendency to gather upward, it is beneficial to increase the contact area between the liquid and the carbon dioxide.

[0093] Reference Figure 1 、 Figure 2 and Figure 3As shown, this construction method utilizes the water circulation of the storage site itself and does not need to rely on the transportation of surface water sources. It is beneficial to accelerate the dissolution of carbon dioxide and improve the safety of storage. It can also inhibit the lateral diffusion of carbon dioxide below the carbon dioxide reservoir 1100 and improve the utilization rate of the carbon dioxide reservoir 1100. This construction method utilizes the kinetic energy of carbon dioxide injection so that the energy extractor 200 can drive the pump body 300 to operate to realize the extraction of liquid, and uses the same injection pipe 100 to realize water injection and gas injection at the same time, which is beneficial to reduce the number of pipeline arrangements and reduce the difficulty of construction.

[0094] Reference Figure 1 、 Figure 2 and Figure 4 As shown, it is understandable that the carbon dioxide geological storage injection device further includes a first sealing member 710 and a second sealing member 720 arranged in an upper and lower manner, and the construction method further includes the following steps:

[0095] In step S500, the second sealing member 720 and the first sealing member 710 are placed between the injection pipe 100 and the construction well 800, so that the first sealing member 710, the second sealing member 720, the outer peripheral wall of the injection pipe 100 and the inner peripheral wall of the construction well 800 jointly define the exhaust chamber 910, and the exhaust chamber 910 is connected to the first exhaust hole 112 and the second exhaust hole 810.

[0096] Reference Figure 1 、 Figure 2 and Figure 4 As shown, specifically, the carbon dioxide geological storage injection device also includes a first sealing member 710 and a second sealing member 720. The carbon dioxide geological storage injection device can be inserted into a construction well 800 located at the storage site. The first sealing member 710 and the second sealing member 720 are arranged up and down and are both located between the outer periphery of the injection pipe 100 and the inner periphery of the construction well 800. The first sealing member 710 and the second sealing member 720 are respectively located above and below the first exhaust hole 112. The first sealing member 710, the second sealing member 720, the outer peripheral wall of the injection pipe 100 and the inner peripheral wall of the construction well 800 jointly define an exhaust chamber 910. The carbon dioxide gas flows through the injection channel 110, the first exhaust hole 112, the exhaust chamber 910 and the second exhaust hole 810 in sequence, so that the carbon dioxide gas is injected into the carbon dioxide reservoir 1100. The setting of the exhaust chamber 910 is conducive to controlling the area of ​​carbon dioxide gas emission and improving the storage safety of carbon dioxide. A plurality of second exhaust holes 810 are provided, and the plurality of second exhaust holes 810 are arranged circumferentially around the construction well 800 .

[0097] Reference Figure 1 、 Figure 2 and Figure 4As shown, it is understandable that the carbon dioxide geological storage injection device further includes a third sealing member 730, and the injection pipe 100 is provided with a first drainage hole 113 communicating with the pump body 300. The construction method further includes the following steps:

[0098] Step S600: Open a second drainage hole 820 above the construction well 800 corresponding to the second exhaust hole 810;

[0099] In step S700, the third sealing member 730 is placed between the injection pipe 100 and the construction well 800, so that the third sealing member 730, the first sealing member 710, the outer peripheral wall of the injection pipe 100 and the inner peripheral wall of the construction well 800 jointly define a drainage chamber 920, and the drainage chamber 920 is connected to the first drainage hole 113 and the second drainage hole 820.

[0100] Reference Figure 1 、 Figure 2 and Figure 4 As shown, specifically, the carbon dioxide geological storage injection device also includes a third sealing member 730, which is sleeved on the outer periphery of the injection pipe 100 and located above the first sealing member 710. The third sealing member 730, the first sealing member 710, the outer peripheral wall of the injection pipe 100 and the inner peripheral wall of the construction well 800 jointly define a drainage chamber 920. Under the variable pressure action of the pump body 300, the liquid passes through the first drainage hole 113, the drainage chamber 920 and the second drainage hole 820 in sequence, so that the liquid is injected into the carbon dioxide reservoir 1100 above the first exhaust hole 112. The setting of the drainage chamber is conducive to controlling the water injection area, accelerating the dissolution of carbon dioxide and improving the storage safety, and inhibiting the lateral diffusion of carbon dioxide below the carbon dioxide reservoir 1100.

[0101] The third sealing member 730, the first sealing member 710 and the second sealing member 720 are arranged in sequence from top to bottom, thereby dividing the space between the injection pipe 100 and the construction well 800 into four independent chambers, corresponding to the wellhead section, the water injection section, the gas injection section and the pumping section, respectively, to meet the needs of gas injection and water injection, which is conducive to avoiding the problem of carbon dioxide infiltrating or escaping upward from the space between the injection pipe 100 and the construction well 800.

[0102] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the scope of the present invention.

Claims

1. A carbon dioxide geological storage injection device, characterized in that: include: An injection pipe (100) is provided with an injection channel (110) therein, wherein the injection channel (110) is connected to an injection hole (111) and a first exhaust hole (112) arranged vertically. an energy extractor (200), connected to the injection pipe (100), disposed in the injection channel (110) and located between the injection hole (111) and the first exhaust hole (112), and configured to extract kinetic energy of the gas flowing through the injection channel (110); A pump body (300) is connected to the lower end of the injection pipe (100) and is connected to the energy extractor (200). The energy extractor (200) can drive the pump body (300) to operate. The pump body (300) is configured to pump the liquid at the lower end of the injection pipe (100) into the carbon dioxide reservoir (1100) above the first exhaust hole (112).

2. The carbon dioxide geological storage injection device according to claim 1, characterized in that: It also includes a transmission shaft (400), the energy extractor (200) is a turbine motor, the upper end of the transmission shaft (400) is connected to the turbine motor, and the lower end of the transmission shaft (400) is connected to the pump body (300).

3. The carbon dioxide geological storage injection device according to claim 2, characterized in that: The invention also includes a connecting block (500) connected to the inner wall surface of the injection channel (110); the transmission shaft (400) is provided with a water injection channel (410) extending up and down; the pump body (300) is connected to the lower end of the water injection channel (410); the transmission shaft (400) is rotatably connected to the connecting block (500); the injection pipe (100) has a first drainage hole (113) located above the first exhaust hole (112); and the connecting block (500) has a drainage channel (510) connected to the upper end of the water injection channel (410) and the first drainage hole (113).

4. The carbon dioxide geological storage injection device according to claim 3, characterized in that: The outer peripheral wall of the connecting block (500) is connected to the inner peripheral wall of the injection channel (110), the connecting block (500) is located above the turbine motor, and the connecting block (500) has an air vent opposite to the turbine motor; and / or, It also includes a threaded joint (600), the threaded joint (600) is connected to the upper end of the injection pipe (100), and the injection hole (111) is provided on the threaded joint (600).

5. The carbon dioxide geological storage injection device according to claim 3, characterized in that: The invention also includes a first sealing member (710) and a second sealing member (720), wherein the first sealing member (710) and the second sealing member (720) are arranged in an upper and lower manner and are both sleeved on the outer circumference of the injection pipe (100), and the first sealing member (710) and the second sealing member (720) are respectively located above and below the first exhaust hole (112).

6. The carbon dioxide geological storage injection device according to claim 5, characterized in that: The invention also includes a third sealing member (730), which is sleeved on the outer periphery of the injection pipe (100) and located above the first sealing member (710). The third sealing member (730) and the first sealing member (710) are respectively located above and below the first drainage hole (113).

7. Construction method, characterized in that: Applied to the carbon dioxide geological storage injection device according to any one of claims 1 to 6, the construction method comprises: Drilling a branch well (1000) at a predetermined storage site, extending the branch well (1000) to the water extraction layer of the storage site; Establishing a construction well (800) at a preset location of the storage site, such that the construction well (800) penetrates the carbon dioxide reservoir (1100) and the water extraction layer, and a second exhaust hole (810) is opened in the construction well (800) corresponding to the carbon dioxide reservoir (1100); The injection pipe (100) is inserted into the construction well (800) so that the first exhaust hole (112) and the second exhaust hole (810) are in communication.

8. The construction method according to claim 7, characterized in that: The construction method further comprises: Carbon dioxide gas is injected into the injection hole (111), so that the carbon dioxide gas flows through the energy extractor (200) and flows out from the first exhaust hole (112). The energy extractor (200) drives the pump body (300) to operate, so as to pump the liquid in the water extraction layer into the carbon dioxide reservoir (1100) above the first exhaust hole (112).

9. The construction method according to claim 7, characterized in that: The carbon dioxide geological storage injection device further comprises a first sealing member (710) and a second sealing member (720) arranged in an upper and lower manner, and the construction method further comprises: The second sealing member (720) and the first sealing member (710) are placed between the injection pipe (100) and the construction well (800), so that the first sealing member (710), the second sealing member (720), the outer peripheral wall of the injection pipe (100) and the inner peripheral wall of the construction well (800) jointly define an exhaust chamber (910), and the exhaust chamber (910) is connected to the first exhaust hole (112) and the second exhaust hole (810).

10. The construction method according to claim 9, characterized in that: The carbon dioxide geological storage injection device further includes a third sealing member (730), the injection pipe (100) is provided with a first drainage hole (113) communicating with the pump body (300), and the construction method further includes: A second drainage hole (820) is provided above the construction well (800) corresponding to the second exhaust hole (810); The third sealing member (730) is placed between the injection pipe (100) and the construction well (800), so that the third sealing member (730), the first sealing member (710), the outer peripheral wall of the injection pipe (100) and the inner peripheral wall of the construction well (800) jointly define a drainage chamber (920), and the drainage chamber (920) is connected to the first drainage hole (113) and the second drainage hole (820).

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