A carbon dioxide geological storage well

Abstract

The present invention discloses a carbon dioxide geological storage well, comprising: a well body, a sealing self-locking component, a pressurized filling component and an air pressure sensor, the top of the well body is fixedly connected to a wellhead sleeve, and the outer periphery of the top of the wellhead sleeve is provided with a sealed well edge, the top surface of the sealed well edge is provided with a sealing cover, the sealing self-locking component comprises a fixed ear seat respectively fixed to one side of the wellhead sleeve and a fixed seat and a gas lift rod fixed to the top surface of the sealing cover, the surface of the fixed ear seat is rotatably connected with an ear plate, and the inner side of the fixed ear seat is rotatably installed with a driving cylinder. In the present invention, by integrating the wellhead sealing structure of the carbon dioxide geological storage well with the injection equipment, arranging the pressurized filling component on the surface of the sealing cover can perform daily pressurization on the storage well with insufficient pressure, so that the internal pressurization of the storage well makes the carbon dioxide enter the critical state of liquid state more easily absorbed by the rock formation, and the wellhead end is pressurized during the carbon dioxide injection process to increase the filling pressure and improve the filling effect.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide storage, and in particular to a carbon dioxide geological storage well. Background Art

[0002] Carbon dioxide geological storage refers to the technology of capturing carbon dioxide generated in the production process of large emission source enterprises through engineering and technical means and injecting it into deep geological reservoirs for storage, achieving the process of long-term isolation of carbon dioxide from the atmosphere. It is one of the key technologies for addressing global climate change. As a key channel for CO2 injection and storage, the sealing performance of the storage well is directly related to the storage effect and environmental safety. The wellhead sealing structure plays a vital role in the carbon dioxide geological storage well and is a key component to ensure the safety and effectiveness of the entire storage system.

[0003] The existing wellhead sealing structure of carbon dioxide geological storage wells is simple, and the wellhead is mainly fully sealed by the sealing structure. During the high-pressure injection process, leakage is prone to occur due to the connection between the sealed wellhead and the injection equipment. The traditional wellhead sealing structure needs to be complexly connected to the injection equipment. These connection points not only increase the difficulty of installation and operation, but also easily become weak links for leakage. The sealing effect of the connection is difficult to guarantee, and once a problem occurs, it is also difficult to repair. In addition, the traditional injection method cannot provide sufficient pressure, it is difficult to overcome the formation pressure, and effectively inject carbon dioxide into the target rock formation. The reduction in internal pressure of the storage well in the state of carbon dioxide deficiency may cause changes in the geological response of the underground rock, such as changes in formation pressure and permeability, thereby affecting the storage effect and geological stability, and there are many defects.

[0004] In view of this, research and improvement are carried out on the existing problems, and a carbon dioxide geological storage well is provided to solve the current problems. The purpose is to solve the problems and improve the practical value through this technology. Summary of the invention

[0005] The present invention aims to solve one of the technical problems existing in the prior art or related technology.

[0006] To this end, the technical solution adopted by the present invention is: a carbon dioxide geological storage well, comprising: a well body, a sealing self-locking component, a pressurized filling component and a gas pressure sensor, the top of the well body is fixedly connected to a wellhead sleeve, and the outer periphery of the top of the wellhead sleeve is provided with a sealing well edge, the top surface of the sealing well edge is provided with a sealing cover, the sealing self-locking component comprises a fixed ear seat respectively fixed to one side of the wellhead sleeve and a fixed seat and a gas lift rod fixed to the top surface of the sealing cover, the surface of the fixed ear seat is rotatably connected to an ear plate, the inner side of the fixed ear seat is rotatably installed with a driving cylinder and the output end of the driving cylinder is movably connected to the surface of the ear plate, the surface of the fixed seat is rotatably installed with a buckle lock, the surface of the ear plate is movably connected with a plurality of linkage bars, and the plurality of linkage bars are connected to the surface of the buckle lock in a one-to-one correspondence, and the surface of the fixed seat is fixedly installed with a guide bar rod for guiding the movement of the ear plate and the fixed seat;

[0007] The pressurized filling assembly includes a pressure injection chamber, a piston tube, an inclined handle shaft and an inclined disk seat, and a column pressure connecting rod movably connected to the surface of the inclined disk seat. A piston is slidably installed on the inner side of the piston tube, and the bottom end of the piston tube passes through the surface of the sealing cover. The bottom ends of the piston and the piston tube are fixedly installed with one-way valve components, and the two one-way valve components are arranged in opposite directions. The inclined handle shaft is fixedly installed on the inner side of the pressure injection chamber and rotatably sleeved on the inner side of the inclined disk seat. The inclined disk seat is obliquely arranged and rotatably sleeved on the surface of the inclined handle shaft. The top end of the inclined disk seat is connected to a transmission tooth for connecting to an external drive motor, and the surface of the pressure injection chamber is provided with a connecting port for the introduction of external gas and carbon dioxide.

[0008] In a preferred example, the present invention can be further configured as follows: a turntable seat fixedly sleeved on the surface of the piston tube is provided on the inner side of the injection and pressure chamber, and the outer periphery of the turntable seat is in sealing contact with the inner side of the injection and pressure chamber.

[0009] In a preferred example, the present invention can be further configured as follows: a plurality of ball heads are provided on the surface of the inclined plate seat for movably connecting with the top end of the column pressure connecting rod, a circular disc fixed to the inner side of the injection chamber and arranged obliquely is sleeved on the surface of the inclined handle shaft, and the top surface of the inclined plate seat is in sliding contact with the bottom surface of the inclined plate, and the inclined handle shaft is fixedly installed at the axis center of the turntable seat.

[0010] In a preferred example, the present invention can be further configured as follows: the one-way valve component includes a valve seat, a valve core body and a spring fixed to one end of the valve core body, the inner side of the valve seat is provided with a plurality of evenly distributed air channels, the outer side of the valve core body is in sliding contact with the inner side of the valve seat and is used for sealing the air channel port.

[0011] In a preferred example, the present invention can be further configured as follows: the driving cylinder is an electric rod or a hydraulic rod structure used for deflection driving of the ear plate, the ear plate is slidably guided by the guide rod on the surface of the cover and the fixed seat, the guide rod is arranged in parallel with the gas lift rod, and the bottom end of the column pressure connecting rod passes through the cover and is connected to the inner cavity of the well body.

[0012] In a preferred example, the present invention can be further configured as follows: the buckle lock is a C-shaped structure for buckling on the edge of the sealing cover and the sealing well edge to lock the sealing well edge and the sealing cover.

[0013] In a preferred example, the present invention can be further configured as follows: the two ends of the linkage strip are movably connected to the surfaces of the buckle and the ear plate respectively, and the bottom surface of the cover is provided with a sealing cushion layer abutting against the bottom surface of the sealing well.

[0014] In a preferred example, the present invention can be further configured as follows: the air pressure sensor is embedded and installed on the cover surface to detect the change of air pressure inside the wellhead casing, and the output end of the air pressure sensor is electrically connected to a control unit for controlling the pressurized filling component.

[0015] The beneficial effects achieved by the present invention are:

[0016] 1. In the present invention, by integrating the wellhead sealing structure of the carbon dioxide geological storage well with the injection equipment, a pressurized filling component is arranged on the sealing surface to perform daily pressurization on the storage well with insufficient pressure, so that the internal pressurization of the storage well makes the carbon dioxide enter the critical state of liquid state and is more easily absorbed by the rock formation, and during the carbon dioxide injection process, the wellhead end is pressurized to increase the filling pressure and improve the filling effect.

[0017] 2. In the present invention, by setting up a leakage detection structure, the inside of the well body can be pressurized through the pressurized filling component in daily use or in a low-pressure environment in the well, the rate of change of the pressure state in the well can be detected to determine the air tightness, the sealing effect of the well body can be measured in time and an alarm can be given, and the inside of the well body can be filled in a continuous column pressure manner through a multi-piston tube and a column pressure connecting rod, so that the filling gas pressure shows a steady rising effect, effectively performing airtight leakage detection, and improving the filling effect during the carbon dioxide storage process.

[0018] 3. In the present invention, a new type of pneumatic self-locking structure is provided, and the connecting effect between the internal air pressure of the well body and the air lift rod is utilized to lift the ear plate, and the wellhead sleeve and the sealing well edge are locked by the linkage bar linkage lock deflection, thereby improving the sealing and locking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the exploded structure of a sealing self-locking component according to an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of the cross-sectional structure of a sealing self-locking component according to an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of a partial cross-sectional structure of a pressurized filling assembly according to an embodiment of the present invention;

[0023] Figure 5 It is a schematic diagram of the structure of a piston tube, an inclined handle shaft and an inclined disc seat according to an embodiment of the present invention;

[0024] Figure 6 A schematic diagram of the piston tube and the inclined plate seat structure of an embodiment of the present invention;

[0025] Figure 7 The figure is a schematic diagram of the cross-sectional structure of a one-way valve component according to an embodiment of the present invention.

[0026] Reference numerals:

[0027] 100, well body; 110, wellhead casing; 120, well edge sealing; 130, capping;

[0028] 200, sealing self-locking assembly; 210, fixed ear seat; 220, driving cylinder; 230, ear plate; 240, fixed seat; 250, gas lift rod; 260, buckle lock; 231, linkage bar; 232, guide bar;

[0029] 300, pressurized filling assembly; 310, pressure filling chamber; 320, piston tube; 330, inclined handle shaft; 340, inclined plate seat; 350, column pressure connecting rod; 360, one-way valve member; 311, connecting port; 321, piston; 361, valve seat; 362, valve core body; 363, spring; 364, airway;

[0030] 400. Air pressure sensor. DETAILED DESCRIPTION

[0031] To make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in combination with specific implementations and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0032] It is to be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention.

[0033] A carbon dioxide geological storage well provided by some embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0034] Combination Figure 1-7As shown, a carbon dioxide geological storage well provided by the present invention comprises: a well body 100, a sealing self-locking assembly 200, a pressurized filling assembly 300 and a gas pressure sensor 400, the top of the well body 100 is fixedly connected to a wellhead casing 110, and the outer periphery of the top of the wellhead casing 110 is provided with a sealing well edge 120, and the top surface of the sealing well edge 120 is provided with a sealing cover 130, and the sealing self-locking assembly 200 comprises a fixed ear seat 210 respectively fixed to one side of the wellhead casing 110, a fixed seat 240 fixed to the top surface of the sealing cover 130, and a gas lift rod 250. 0, the surface of the fixed ear seat 210 is rotatably connected with the ear plate 230, the inner side of the fixed ear seat 210 is rotatably installed with a driving cylinder 220, and the output end of the driving cylinder 220 is movably connected with the surface of the ear plate 230, the surface of the fixed seat 240 is rotatably installed with a buckle lock 260, the surface of the ear plate 230 is movably connected with a plurality of linkage bars 231, and the plurality of linkage bars 231 are connected to the surface of the buckle lock 260 in a one-to-one correspondence, and the surface of the fixed seat 240 is fixedly installed with a guide bar rod 232 for guiding the movement of the ear plate 230 and the fixed seat 240;

[0035] The pressurized filling assembly 300 includes a filling and pressure chamber 310, a piston tube 320, an inclined handle shaft 330 and an inclined disk seat 340, and a column pressure connecting rod 350 movably connected to the surface of the inclined disk seat 340. A piston 321 is slidably installed on the inner side of the piston tube 320, and the bottom end of the piston tube 320 passes through the surface of the cover 130. The bottom ends of the piston 321 and the piston tube 320 are fixedly installed with a one-way valve member 360, and the two one-way valve members 360 are arranged in opposite directions. The inclined handle shaft 330 is fixedly installed on the inner side of the filling and pressure chamber 310 and is rotatably sleeved on the inner side of the inclined disk seat 340. The inclined disk seat 340 is arranged obliquely and is rotatably sleeved on the surface of the inclined handle shaft 330. The top end of the inclined disk seat 340 is connected with a transmission tooth for connecting to an external drive motor. The surface of the filling and pressure chamber 310 is provided with a connecting port 311 for the introduction of external gas and carbon dioxide.

[0036] In this embodiment, a turntable seat fixedly sleeved on the surface of the piston tube 320 is provided on the inner side of the injection and pressure chamber 310 , and the outer periphery of the turntable seat is in sealing contact with the inner side of the injection and pressure chamber 310 .

[0037] Specifically, when the swash plate seat 340 rotates, the synchronous rotation of the turntable seat drives the plurality of piston tubes 320 to perform synchronous orbital motion.

[0038] Furthermore, the surface of the inclined plate seat 340 is provided with a plurality of ball heads for movably connecting with the top end of the column pressure connecting rod 350, and the surface of the inclined handle shaft 330 is sleeved with a circular disc fixed to the inner side of the injection and pressure chamber 310 and arranged obliquely, and the top surface of the inclined plate seat 340 is in sliding contact with the bottom surface of the inclined plate, and the inclined handle shaft 330 is fixedly installed at the axis center of the turntable seat.

[0039] Specifically, the top surface of the swash plate seat 340 is in contact with the swash plate inside the injection and pressure chamber 310 to guide the swash plate seat 340 to rotate in an inclined state, thereby realizing the up and down reciprocating motion of the pistons 321 inside the multiple piston tubes 320 and the column pressure connecting rods 350.

[0040] In this embodiment, the one-way valve component 360 includes a valve seat 361, a valve core body 362 and a spring 363 fixed to one end of the valve core body 362. A plurality of evenly distributed air channels 364 are provided on the inner side of the valve seat 361. The outer side of the valve core body 362 slides against the inner side of the valve seat 361 and is used to seal the port of the air channel 364.

[0041] Specifically, the movement position of the valve core body 362 is controlled by the airflow and the spring 363 to open and close the airway 364, thereby realizing the unidirectional flow-guiding movement of the airflow.

[0042] In this embodiment, the drive cylinder 220 is an electric rod or hydraulic rod structure used for deflection drive of the ear plate 230. The ear plate 230 is slidably guided by the guide rod 232 on the surface of the cover 130 and the fixed seat 240. The guide rod 232 is arranged parallel to the gas lift rod 250. The bottom end of the column pressure connecting rod 350 passes through the cover 130 and is connected to the inner cavity of the well body 100.

[0043] Specifically, the ejection work of the gas ejector rod 250 is realized by connecting the internal air pressure of the well body 100 and the cover 130, and the spacing between the ear plate 230 and the cover 130 is controlled, and the linkage buckle 260 is deflected and automatically locked.

[0044] The buckle lock 260 is a C-shaped structure for buckling on the edge of the sealing cover 130 and the sealing well edge 120 to lock the sealing well edge 120 and the sealing cover 130 .

[0045] In this embodiment, the two ends of the linkage bar 231 are movably connected to the surface of the buckle 260 and the ear plate 230 respectively, and the bottom surface of the cover 130 is provided with a sealing gasket layer abutting against the bottom surface of the sealing well edge 120.

[0046] In this embodiment, the air pressure sensor 400 is embedded and installed on the surface of the cover 130 to detect the change of air pressure inside the wellhead casing 110 , and the output end of the air pressure sensor 400 is electrically connected to a control unit for controlling the pressurized filling assembly 300 .

[0047] Specifically, when the air pressure sensor 400 detects that the air pressure inside the well body 100 is lower than the set value, the pressurizing and filling assembly 300 can be automatically started to work and perform a self-inspection of the air tightness inside the well body 100.

[0048] The working principle and use process of the present invention:

[0049] During carbon dioxide storage in the geological storage well, the gas lift rod 250 is connected to the internal gas pressure of the well body 100 to drive the gas lift rod 250 to lift up to provide a pre-tightening force between the ear plate 230 and the fixing seat 240, so that the ear plate 230 rises along the surface of the guide bar rod 232, and drives the linkage bar 231 and the buckle 260 to deflect and move, so that the buckle 260 is buckled on the surface of the cover 130 and the sealing well edge 120, thereby ensuring the sealing effect of the cover 130;

[0050] During the carbon dioxide sealing process, the carbon dioxide gas source is connected through the connecting port 311 to introduce airflow, so that the inclined plate seat 340 synchronously drives the inclined plate seat 340 and several piston tubes 320 to rotate during the rotation movement on the surface of the inclined handle shaft 330. The inclined plate seat 340 performs reciprocating tilting movement during the rotation of the surface of the inclined handle shaft 330, and the column pressure connecting rod 350 and the piston 321 slide up and down inside the piston tube 320. When the piston 321 slides upward, the internal gas of the injection and pressure chamber 310 enters the piston tube 320 through the linkage bar 231 and the one-way valve component 360 at the bottom of the piston 321, and is blocked by the one-way valve component 360 at the bottom of the piston 321 during the downward movement of the piston 321. The one-way valve component 360 at the bottom of the piston tube 320 releases the internal airflow of the piston tube 320, so that the internal gas of the injection and pressure chamber 310 is pressurized and passed into the well body 100 for efficient filling.

[0051] When the air pressure sensor 400 detects that the air pressure inside the well body 100 is lower than the set value, the pressurized filling component 300 can be automatically started to work, and the external gas can be pressurized and injected into the well body 100. The multi-piston tube 320 and the column pressure connecting rod 350 perform continuous column pressure to fill the inside of the well body 100, so that the filling air pressure shows a steady rising effect. If a leak occurs in the sealed well during this rising state, the air pressure sensor 400 senses that the air pressure rising curve is discontinuous or has no pressurization effect, indicating that there is a leak point in the geological sealing well.

[0052] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0053] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A carbon dioxide geological storage well, characterized in that: include: A well body (100), a sealing self-locking component (200), a pressurized filling component (300) and an air pressure sensor (400), wherein the top of the well body (100) is fixedly connected to a wellhead casing (110), and the outer periphery of the top of the wellhead casing (110) is provided with a sealing well edge (120), and the top surface of the sealing well edge (120) is provided with a sealing cover (130), and the sealing self-locking component (200) comprises a fixed ear seat (210) respectively fixed to one side of the wellhead casing (110) and a fixed seat (240) and a gas lift rod (250) fixed to the top surface of the sealing cover (130), and the surface of the fixed ear seat (210) is provided with a sealing cover (130). The surface of the fixed ear seat (210) is rotatably connected with an ear plate (230); a driving cylinder (220) is rotatably installed on the inner side of the fixed ear seat (210), and the output end of the driving cylinder (220) is movably connected to the surface of the ear plate (230); a buckle lock (260) is rotatably installed on the surface of the fixed seat (240); a plurality of linkage bars (231) are movably connected to the surface of the ear plate (230), and the plurality of linkage bars (231) are connected to the surface of the buckle lock (260) in a one-to-one correspondence; a guide bar rod (232) for guiding the movement of the ear plate (230) and the fixed seat (240) is fixedly installed on the surface of the fixed seat (240); The pressurized filling assembly (300) comprises a pressure filling chamber (310), a piston tube (320), an inclined handle shaft (330), an inclined plate seat (340), and a column pressure connecting rod (350) movably connected to the surface of the inclined plate seat (340); a piston (321) is slidably mounted on the inner side of the piston tube (320), and the bottom end of the piston tube (320) penetrates the surface of the sealing cover (130); and a one-way valve member (360) is fixedly mounted on the bottom end of the piston (321) and the bottom end of the piston tube (320). ) and the two one-way valve members (360) are arranged in opposite directions, the inclined handle shaft (330) is fixedly installed on the inner side of the injection and pressure chamber (310) and is rotatably sleeved on the inner side of the inclined plate seat (340), the inclined plate seat (340) is arranged obliquely and is rotatably sleeved on the surface of the inclined handle shaft (330), the top end of the inclined plate seat (340) is connected with a transmission tooth for connecting to an external drive motor, and the surface of the injection and pressure chamber (310) is provided with a connecting port (311) for the introduction of external gas and carbon dioxide.

2. A carbon dioxide geological storage well according to claim 1, characterized in that: The inner side of the injection and pressure chamber (310) is provided with a turntable seat which is fixedly sleeved on the surface of the piston tube (320), and the outer periphery of the turntable seat is in sealing contact with the inner side of the injection and pressure chamber (310).

3. A carbon dioxide geological storage well according to claim 2, characterized in that: The surface of the inclined disk seat (340) is provided with a plurality of ball heads for active connection with the top end of the column pressure connecting rod (350); the surface of the inclined handle shaft (330) is sleeved with a circular disk fixed to the inner side of the injection and pressure chamber (310) and arranged obliquely; the top surface of the inclined disk seat (340) is in sliding contact with the bottom surface of the inclined disk; the inclined handle shaft (330) is fixedly installed at the axis center of the turntable seat.

4. A carbon dioxide geological storage well according to claim 1, characterized in that: The one-way valve component (360) comprises a valve seat (361), a valve core body (362) and a spring (363) fixed to one end of the valve core body (362); a plurality of evenly distributed air passages (364) are provided on the inner side of the valve seat (361); the outer side of the valve core body (362) is in sliding contact with the inner side of the valve seat (361) and is used to seal the port of the air passage (364).

5. The carbon dioxide geological storage well according to claim 1, characterized in that: The driving cylinder (220) is an electric rod or hydraulic rod structure used for deflection driving of the ear plate (230); the ear plate (230) is slidably guided by a guide bar rod (232) on the surface of the cover (130) and the fixing seat (240); the guide bar rod (232) is arranged in parallel with the gas lift rod (250); and the bottom end of the column pressure connecting rod (350) passes through the cover (130) and is connected to the inner cavity of the well body (100).

6. The carbon dioxide geological storage well according to claim 1, characterized in that: The buckle lock (260) is a C-shaped structure used for buckling on the surface edges of the sealing cover (130) and the sealing well edge (120) to lock the sealing well edge (120) and the sealing cover (130).

7. The carbon dioxide geological storage well according to claim 1, characterized in that: The two ends of the linkage strip (231) are movably connected to the surfaces of the buckle (260) and the ear plate (230) respectively, and the bottom surface of the sealing cover (130) is provided with a sealing cushion layer abutting against the bottom surface of the sealing well edge (120).

8. The carbon dioxide geological storage well according to claim 1, characterized in that: The air pressure sensor (400) is embedded and installed on the surface of the cover (130) to detect the change of air pressure inside the wellhead casing (110), and the output end of the air pressure sensor (400) is electrically connected to a control unit for controlling the pressurized filling component (300).

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