Deep sea combustible ice mining and carbon dioxide sealing integrated operation tool and method

Abstract

The invention discloses a deep sea combustible ice mining and carbon dioxide sealing and jetting integrated operation tool which is mainly composed of a safety connector mechanism, a mechanical self-locking mechanism, an anchoring mechanism, a packing mechanism and a jetting mechanism. The mechanical self-locking mechanism comprises a switching self-locking connector, a slope guide ring and a spring I, switching and locking of different functions are achieved, and the practicability of the tool is improved; the anchoring mechanism is internally provided with an upper slip, a horse tooth shaft I, a double-stroke piston cylinder I, a double-stroke piston cylinder II, a horse tooth shaft II and a lower slip, so that the anchoring capability is enhanced, and the operation stability is ensured; through the change of the movement stroke of the mechanical self-locking mechanism, switching and locking of drilling, mining, injection and sealing functions are achieved, and mutual combination of multiple natural gas hydrate mining methods, fracturing transformation and hydrate carbon sequestration is achieved; integration is achieved through combination of all the mechanisms. By combining a process method, the risk of carbon dioxide hydrate downhole blockage is prevented, and the carbon sequestration amount is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas hydrate exploitation and carbon sequestration, and in particular to an integrated operation tool and method for deep-sea methane hydrate exploitation and carbon dioxide sequestration injection. Background Art

[0002] Deep-sea methane hydrate mining is one of the unconventional natural gas resources with the greatest potential that has not yet been developed. Compared with traditional oil and gas reservoirs, safe and efficient development is a huge challenge. At present, the main methods for deep-sea methane hydrate mining are: thermal shock mining, pressure reduction mining, and carbon dioxide replacement mining. In addition, scholars have proposed a solid fluidization mining method for deep-sea methane hydrate mining in my country's marine environment, which has the characteristics of weak cementation, no dense cap rock, and non-diagenetic properties.

[0003] Subsea carbon dioxide storage technology refers to the technology of storing carbon dioxide in the form of solid hydrates in the shallow seabed. This technology usually injects liquid carbon dioxide into seabed sediments to form stable solid hydrates under specific temperature and pressure conditions, thereby achieving long-term carbon storage. The principle of subsea carbon dioxide storage technology is similar to the formation mechanism of natural gas hydrates. In the shallow seabed environment, gases such as methane can combine with water molecules to form hydrates. This process is called hydration. Similarly, carbon dioxide can also form hydrates with water molecules under specific conditions. These hydrates are relatively stable in the shallow seabed environment and can store carbon dioxide for a long time.

[0004] At present, the combination of deep-sea methane hydrate mining and carbon dioxide storage has become a research hotspot, and its feasibility has been proven in theory and experiments. However, when these technologies are applied to actual projects, there is a lack of tools specifically used for deep-sea methane hydrate mining and carbon dioxide storage projects. Existing deep-sea methane hydrate mining tools are usually used for carbon dioxide storage. The generalization of such non-specialized tools has a great impact on the mining, carbon fixation efficiency and safety of deep-sea methane hydrate. Therefore, it is urgent to develop a special tool to meet the needs of this combined project, and it needs to meet the following specific functional requirements: ① It can combine a variety of natural gas hydrate mining methods, fracturing transformation methods, and hydrate carbon fixation methods; ② It can realize the isolation and anchoring functions when liquid carbon dioxide is injected; ③ It can effectively prevent the risk of carbon dioxide hydrate downhole blockage.

[0005] Through comprehensive and in-depth market and product research, it is found that there is currently no relevant downhole tool that can meet all the above functional requirements. Therefore, it is urgent to invent an integrated operation tool for deep-sea methane hydrate mining and carbon dioxide storage injection. Summary of the invention

[0006] The purpose of the present invention is to provide an integrated operation tool for deep-sea methane hydrate mining and carbon dioxide storage injection in response to the specific functional requirements in deep-sea methane hydrate mining and carbon dioxide storage projects, which is mainly composed of a safety joint mechanism, a mechanical self-locking mechanism, an anchoring mechanism, a sealing mechanism, and an injection mechanism. The mechanical self-locking mechanism includes a switching self-locking joint, a bevel guide ring, and a spring I, which realizes the switching and locking of different functions and improves the practicality of the tool; the anchoring mechanism is equipped with an upper slip, a tooth shaft I, a double-stroke piston cylinder I, a double-stroke piston cylinder II, a tooth shaft II, and a lower slip, which enhances the anchoring ability and ensures the stability of the operation; the present invention realizes the switching and locking of drilling, mining, injection and storage functions through the change of the movement stroke of the mechanical self-locking mechanism, and realizes the mutual combination of various natural gas hydrate mining methods, fracturing transformation, and hydrate carbon fixation; integration is achieved through the combination of various mechanisms; the risk of carbon dioxide hydrate downhole blockage is prevented by combining process methods, and the carbon storage volume is increased.

[0007] The following technical solution is adopted by the present invention patent to solve its technical problems: a deep-sea methane hydrate mining and carbon dioxide storage injection integrated operation tool, mainly composed of a safety joint mechanism, a mechanical self-locking mechanism, an anchoring mechanism, a sealing mechanism, and an injection mechanism, characterized in that:

[0008] The safety joint mechanism is composed of a continuous tubing joint, an O-type sealing ring I, a set screw, a connecting tool, a shear pin, and a movable barrel core: the continuous tubing joint is provided with a sealing groove I at the head end, a positioning installation groove at the front, a shear pin groove in the middle, and a conical boss inside. The continuous tubing joint is installed inside the end of the continuous tubing, the O-type sealing ring I is installed in the sealing groove I of the continuous tubing joint, the connecting tool is installed outside the end of the continuous tubing, the set screw is installed on the connecting tool, the shear pin is installed in the middle shear pin groove of the continuous tubing joint, and the head end of the movable barrel core is in contact with the conical boss of the continuous tubing joint;

[0009] The mechanical self-locking mechanism is composed of a switching self-locking joint, a bevel guide ring, a thrust bearing, and a spring I: the head end of the switching self-locking joint is installed inside the continuous tubing joint, the tail groove is provided at the end of the bevel guide ring, and is sleeved on the head end of the movable barrel core, the thrust bearing is installed in the tail groove of the bevel guide ring, and the spring I is sleeved outside the movable barrel core, and the head end is in contact with the thrust bearing;

[0010] The anchoring mechanism is composed of an upper cone joint, a slip cover Ⅰ, a spring Ⅱ, an upper slip, a tooth shaft Ⅰ, a double-stroke piston cylinder Ⅰ, a double-stroke piston cylinder Ⅱ, a tooth shaft Ⅱ, a slip cover Ⅱ, a spring Ⅲ, a lower slip, and a lower cone joint: the upper cone joint is sleeved outside the movable cylinder core, the head end is connected to the outer layer of the switching self-locking joint, a boss is provided inside to contact the end of the spring Ⅰ, an inclined surface Ⅰ is provided outside to contact the upper slip, and a concave platform Ⅰ is also provided in the middle; the double-stroke piston cylinder Ⅰ is installed outside the upper cone joint, the head end of the tooth shaft Ⅰ is in contact with the tail of the upper slip, and its tail end is installed at the head of the double-stroke piston cylinder Ⅰ The front end of the slip cover I is connected to the middle concave platform I of the upper cone joint, and the rear end is connected to the front end of the double-stroke piston cylinder I. The spring II is installed between the upper slip and the slip cover I. The lower cone joint is sleeved outside the movable cylinder core, and the front end is connected to the rear end of the upper cone joint. The outside is provided with an inclined surface II in contact with the rear part of the lower slip, and the middle is provided with a concave platform II. The double-stroke piston cylinder II is installed outside the lower cone joint. The front end of the tooth shaft II is in contact with the rear part of the lower slip, and the rear end is installed inside the front end of the double-stroke piston cylinder II. The spring III is installed between the lower slip and the slip cover II.

[0011] The sealing mechanism is composed of a piston shaft I, a rubber cylinder, a spacer ring, a piston shaft II, and an O-ring II: the rubber cylinder is sleeved on the tail of the upper cone joint, the spacer ring is installed between the rubber cylinders and sleeved on the tail of the upper cone joint, the head end of the piston shaft I contacts the rubber cylinder, and the tail end is installed inside the end of the double-stroke piston cylinder I, the head end of the piston shaft II contacts the rubber cylinder, and the tail end is installed inside the end of the double-stroke piston cylinder II, and the O-ring II are arranged in groups of two and are respectively installed on the movable cylinder core;

[0012] The injection mechanism is composed of an injection connector and a throttling plug: the head end of the injection connector is connected to the tail end of the lower cone joint, and the throttling plug is installed inside the tail end of the injection connector;

[0013] The movable cylinder core has a plurality of limit bosses at equal angles on the outside of the head end, a pressure drop slope is provided inside the head end, a plurality of valve core holes I, a plurality of valve core holes II, a plurality of valve core holes III, and a plurality of valve core holes IV are provided at equal angles on the circumference of different axial sections of the movable cylinder core valve body, and a plurality of groups of sealing grooves II are provided on different axial sections of the movable cylinder core valve body;

[0014] The switching self-locking joint has a self-locking shoulder at the head end, a shear pin groove in the middle, and self-locking guide slopes of different lengths cooperating with the slope guide ring at the tail end;

[0015] The injection connector is axially provided with a plurality of groups of jet injection holes, which are arranged in a circumferential spiral, and has a jet injection cavity inside. The jet injection holes are connected to the jet injection cavity, and a throttling plug mounting platform is provided inside the end;

[0016] The throttling plug has a plurality of interconnected holes at equal angles in the middle, a through hole is opened at the head end to communicate with the circumferential interconnected holes in the middle, and a mounting bolt is provided at the tail end;

[0017] The upper slip has a limit groove I in the middle, a spring II mounting groove I in the middle, and the lower slip has a limit groove II in the middle, a spring III mounting groove II in the middle;

[0018] The middle part of the double-stroke piston cylinder I is provided with a liquid inlet and outlet port I and an anti-blocking net, the upper cone joint is provided with a plurality of connecting holes at equal angles in the circumference, and the connecting holes coincide with the position of the liquid inlet and outlet port I of the double-stroke piston cylinder I, the middle part of the double-stroke piston cylinder II is provided with a liquid inlet and outlet port II and an anti-blocking net, the lower cone joint is provided with a plurality of connecting holes at equal angles in the circumference, and the connecting holes coincide with the position of the liquid inlet and outlet port II of the double-stroke piston cylinder II;

[0019] The present invention also provides a method for integrated operation of deep-sea methane hydrate mining and carbon dioxide storage injection, which is characterized by using any of the above-mentioned integrated operation tools for deep-sea methane hydrate mining and carbon dioxide storage injection, comprising the following steps:

[0020] SⅠ. Drilling into a natural gas hydrate reservoir includes the following steps:

[0021] Sa. Running tools: Install the lifting pump, deep-sea methane hydrate mining and carbon dioxide storage injection integrated operation tool, and hydrate drill bit on the coiled tubing, and run them into the casing through the coiled tubing storage mechanism on the drilling and production platform to the designated layer;

[0022] Sb. Vertical drilling: The drilling fluid enters the tool through the continuous tubing, passes through the oil safety joint and the movable barrel core, and reaches the hydrate drill bit, which controls the hydrate drill bit to drill to the target layer of the natural gas hydrate reservoir.

[0023] SⅡ, natural gas hydrate mining, specifically includes the following steps:

[0024] Sc. Solid fluidized production: the drilling fluid flow rate is changed, the movable barrel moves, the valve core hole III and the valve core hole IV coincide with the injection cavity inside the injection connector, the throttling plug enters the movable barrel, the tail end of the movable barrel is blocked, the tool is switched to the solid fluidized production mode, the drilling fluid is ejected through the jet injection hole on the injection connector, the hydrate slurry is returned by the lift pump, the coiled tubing is pulled back, and the solid fluidized cavity making operation of the natural gas hydrate reservoir is completed;

[0025] Sd. Post-fracturing depressurization and production: After completing the solid fluidization cavitation operation in the natural gas hydrate reservoir, the fracturing agent is injected from the coiled tubing and sprayed out through the jet injection holes on the injection connector to perform fracturing transformation on the target layer of the natural gas hydrate reservoir. After the fracturing transformation is completed, depressurization and production are carried out.

[0026] SⅢ, carbon dioxide hydrate storage, specifically includes the following steps:

[0027] Sd, anchoring, sealing: Drag the deep-sea methane hydrate mining and carbon dioxide storage injection integrated operation tool back to the designated position at the lower end of the casing, change the drilling fluid flow, move the movable barrel core, and the front end of the throttling plug enters the movable barrel core. The drilling fluid flows out from the middle intercommunication hole through the through hole at the head end of the throttling plug. The valve core hole Ⅰ coincides with the position of the inlet and outlet port Ⅰ of the two-stroke piston cylinder Ⅰ, and the valve core hole Ⅱ coincides with the position of the inlet and outlet port Ⅰ of the two-stroke piston cylinder Ⅱ. The tool is switched to the anchoring and sealing working mode, and the drilling fluid enters the two-stroke piston cylinder Ⅰ and the two-stroke piston cylinder Ⅱ. The pressure in the cylinder increases, pushing the tooth shaft Ⅰ, tooth shaft Ⅱ, piston shaft Ⅰ, and piston shaft Ⅱ to overcome the spring Ⅱ and spring Ⅲ respectively, squeezing the upper slip, lower slip, and rubber cylinder to complete the anchoring and sealing operations of the tool;

[0028] Se. Injection and sealing: After the tool is anchored and sealed, the drilling fluid flow is changed, the movable barrel core moves, the valve core hole III and the valve core hole IV coincide with the injection injection cavity inside the injection connector, the throttling plug enters the movable barrel core, the tail end is sealed, and the tool is switched to the carbon sequestration working mode, and liquid carbon dioxide is injected through the continuous oil pipe and ejected through the jet injection hole on the injection connector to generate carbon dioxide hydrate in the cavity created by the solid fluidization of the natural gas hydrate reservoir, completing the carbon dioxide hydrate sealing operation.

[0029] The beneficial effects of the present invention are:

[0030] 1. Aiming at the engineering needs of deep-sea natural gas hydrate exploitation and deep-sea carbon dioxide hydrate fixation, this integrated tool was proposed to solve the urgent need for the lack of special tools and improve the efficiency and safety of natural gas hydrate exploitation and fixation;

[0031] 2. The integrated operation tool utilizes the change of the stroke of the mechanical self-locking mechanism to realize the switching and locking of the tool's drilling, cavity making, injection and sealing functions, which greatly improves the efficiency of deep-sea methane hydrate mining and carbon sequestration, and greatly optimizes the effects of deep-sea natural gas hydrate mining and carbon dioxide hydrate fixation; by setting up the anchoring mechanism and the sealing mechanism, the anchoring and sealing capabilities are enhanced, the operation stability and reliability are ensured, and the practicality of the tool is improved;

[0032] 3. By combining process methods, the tool can inject liquid carbon dioxide into the solid fluidized cavity, which not only strengthens the cavity structure, but also prevents the risk of carbon dioxide hydrate blockage downhole and enhances the carbon storage capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is the appearance diagram of the present invention;

[0034] Figure 2 This is a diagram of the mechanical self-locking mechanism of the present invention;

[0035] Figure 3 It is a diagram of the anchoring mechanism and the packing mechanism of the present invention;

[0036] Figure 4 It is a plan view of the anchoring mechanism and the packing mechanism of the present invention;

[0037] Figure 5 This is a diagram of a continuous tubing joint of the present invention;

[0038] Figure 6 This is a plan view of a coiled tubing joint of the present invention;

[0039] Figure 7 The self-locking joint diagram of the present invention is switched;

[0040] Figure 8 This is a diagram of the outer cylinder of the present invention;

[0041] Fig. 9 This is a plan view of the outer cylinder of the present invention;

[0042] Fig.10 This is a diagram of the inclined guide ring of the present invention;

[0043] Fig.11 This is a diagram of the injection connector of the present invention;

[0044] Fig.12 This is a planed view of the injection connector of the present invention

[0045] Fig.13 This is a diagram of a throttling plug of the present invention;

[0046] Fig.14 This is a plan view of the throttling plug of the present invention;

[0047] Fig.15 The movable cylinder core diagram of the present invention;

[0048] Fig.16 It is a partial planed view of the movable core of the present invention;

[0049] Fig.17 For the present invention, kavatu;

[0050] Fig.18It is a schematic diagram of the deep-sea natural gas hydrate solid fluidization mining and deep-sea carbon dioxide hydrate carbon fixation process of the present invention;

[0051] Fig.19 It is a process flow chart of the present invention.

[0052] In the figure, 1-coiled tubing joint, 101-sealing groove, 102-positioning installation groove, 103-shear pin groove, 104-conical boss, 2-O-ring I, 3-set screw, 4-connection tooling, 5-movable cylinder core, 501-limiting boss, 502-valve core hole I, 503-valve core hole II, 504-valve core hole III, 505-valve core hole IV, 506-sealing groove II, 507-pressure drop slope, 6-switch self-locking joint, 6 01-self-locking shoulder, 602-shear pin groove, 603-self-locking guide bevel, 7-bevel guide ring, 701-tail groove, 8-thrust bearing, 9-spring Ⅰ, 10-piston shaft Ⅰ, 11-rubber cylinder, 12-spacer ring, 13-piston shaft Ⅱ, 14-injection connector, 1401-jet injection hole, 1402-injection injection chamber, 1403-mounting table, 15-O-ring Ⅱ, 16-throttling plug, 1601-interconnecting hole, 1602-through hole, 17-upper cone joint, 1701-connecting hole, 18-slip cover Ⅰ, 19-spring Ⅱ, 20-upper slip, 2001-limiting groove Ⅰ, 2002-installation groove Ⅱ, 21-horse tooth shaft Ⅰ, 22-double stroke piston cylinder Ⅰ, 2201-inlet and outlet Ⅰ, 2202-anti-blocking net Ⅰ, 23-double stroke piston cylinder Ⅱ, 2301-inlet and outlet Ⅱ, 2302-anti-blocking net Ⅱ, 24-horse tooth shaft Ⅱ, 25-slip cover Ⅱ, 26-spring III, 27-lower slip, 2701-limiting groove II, 2702-installing groove II, 28-lower cone joint, 2801-connecting hole, 29-shear pin, 30-carbon dioxide hydrate, 31-coiled tubing, 32-casing, 33-lifting pump, 34-liquid carbon dioxide, 35-solid fluidization cavity making, 36-hydrate drill bit, 37-carbon dioxide hydrate, 38-natural gas hydrate reservoir, 39-drilling and production platform. DETAILED DESCRIPTION

[0053] The present invention is further described below in conjunction with the accompanying drawings, and the protection scope of the present invention is not limited to the following:

[0054] like Figures 1 to 19 As shown, a deep-sea methane hydrate mining and carbon dioxide storage injection integrated operation tool is mainly composed of a safety joint mechanism, a mechanical self-locking mechanism, an anchoring mechanism, a sealing mechanism, and an injection mechanism, and is characterized by:

[0055] like Figure 1As shown, the safety joint mechanism is composed of a continuous tubing joint 1, an O-ring I2, a set screw 3, a connecting tool 4, a shear pin 29, and a movable barrel core 5: the continuous tubing joint 1 is provided with a sealing groove I101 at the head end, a positioning installation groove 102 at the front, a shear pin groove 103 in the middle, and a conical boss 104 inside, the continuous tubing joint 1 is installed inside the end of the continuous tubing 31, the O-ring I2 is installed in the sealing groove I101 of the continuous tubing joint 1, the connecting tool 4 is installed outside the end of the continuous tubing 31, the set screw 3 is installed on the connecting tool 4, the shear pin 29 is installed in the middle shear pin groove 103 of the continuous tubing joint 1, and the head end of the movable barrel core 5 is in contact with the conical boss 104 of the continuous tubing joint 1;

[0056] like Figure 2 As shown, the mechanical self-locking mechanism is composed of a switching self-locking joint 6, a ramp guide ring 7, a thrust bearing 8, and a spring I9: the head end of the switching self-locking joint 6 is installed inside the continuous tubing joint 1, the end of the ramp guide ring 7 is provided with a tail groove 701, which is sleeved on the head end of the movable barrel core 5, the thrust bearing 8 is installed in the tail groove 701 of the ramp guide ring 7, and the spring I9 is ​​sleeved outside the movable barrel core 5, and the head end is in contact with the thrust bearing 8;

[0057] like Figures 3-4 As shown, the anchoring mechanism consists of an upper cone joint 17, a slip cover I 18, a spring II 19, an upper slip 20, a tooth shaft I 21, a double-stroke piston cylinder I 22, a double-stroke piston cylinder II 23, a tooth shaft II 24, a slip cover II 25, a spring III 26, a lower slip 27, and a lower cone joint 28: the upper cone joint 17 is sleeved on the outside of the movable cylinder core 5, the head end is connected to the outer layer of the switching self-locking joint 6, a boss 1704 is provided inside to contact the end of the spring I 9, an inclined surface I 1703 is provided outside to contact the upper slip 20, and a concave platform I 1702 is also provided in the middle, the double-stroke piston cylinder I 22 is installed on the outside of the upper cone joint 17, the head end of the tooth shaft I 21 is in contact with the tail of the upper slip 20, and its tail end is installed on the double-stroke piston Inside the front end of the cylinder Ⅰ22, the front end of the slip cover Ⅰ18 is connected to the middle concave platform Ⅰ1702 of the upper cone joint 17, and the rear end is connected to the front end of the double-stroke piston cylinder Ⅰ22. The spring Ⅱ19 is installed between the upper slip 20 and the slip cover Ⅰ18. The lower cone joint 28 is sleeved outside the movable cylinder core 5, and the front end is connected to the rear end of the upper cone joint 17. The outside is provided with a slope Ⅱ2803 that contacts the rear end of the lower slip 27, and the middle is provided with a concave platform Ⅱ2802. The double-stroke piston cylinder Ⅱ23 is installed outside the lower cone joint 28. The front end of the horse tooth shaft Ⅱ24 contacts the rear end of the lower slip 27, and the rear end is installed inside the front end of the double-stroke piston cylinder Ⅱ23. The spring Ⅲ26 is installed between the lower slip 27 and the slip cover Ⅱ25;

[0058] The sealing mechanism is composed of a piston shaft I 10, a rubber cylinder 11, a spacer ring 12, a piston shaft II 13, and an O-ring II 15: the rubber cylinder 11 is sleeved on the tail of the upper cone joint 17, the spacer ring 12 is installed between the rubber cylinders 11 and sleeved on the tail of the upper cone joint 17, the piston shaft I 10 is in contact with the rubber cylinder 11 at the head end, and the tail end is installed inside the end of the double-stroke piston cylinder I 22, the piston shaft II 13 is in contact with the rubber cylinder 11 at the head end, and the tail end is installed inside the end of the double-stroke piston cylinder II 23, and the O-ring II 15 is in groups of two, and is respectively installed on the movable cylinder core 5;

[0059] The injection mechanism is composed of an injection connector 14 and a throttling plug 16 : the head end of the injection connector 14 is connected to the tail end of the lower cone joint 28 , and the throttling plug 16 is installed inside the tail end of the injection connector 14 .

[0060] like Figures 15-16 As shown, the movable cylinder core 5 is provided with a plurality of limit bosses 501 at equal angles on the outside of the head end, a pressure drop slope 507 is provided inside the head end, a plurality of valve core holes I 502, a plurality of valve core holes II 503, a plurality of valve core holes III 504, and a plurality of valve core holes IV 505 are provided at equal angles on the circumference of different axial sections of the valve body of the movable cylinder core 5, and a plurality of groups of sealing grooves II 506 are provided on different axial sections of the valve body of the movable cylinder core 5;

[0061] like Fig.10 As shown, the switching self-locking joint 6 has a self-locking shoulder 601 at the head end, a shear pin groove 602 in the middle, and a self-locking guide inclined plane 603 of different lengths at the tail end to cooperate with the inclined plane guide ring 7;

[0062] like Figures 11-12 As shown, the injection connector 14 is axially provided with a plurality of groups of jet injection holes 1401, which are arranged in a circumferential spiral, and has a jet injection cavity 1402 inside. The jet injection holes 1401 are connected to the jet injection cavity 1402, and a throttling plug 16 mounting platform 1403 is provided inside the end;

[0063] like Figures 13-14 As shown, the throttling plug 16 has a plurality of interconnected holes 1601 at equal angles in the middle, a through hole 1602 is opened at the head end to communicate with the circumferential interconnected holes 1601 in the middle, and a mounting bolt 1603 is provided at the tail end;

[0064] like Fig.17 As shown, the upper slip 20 has a limit groove Ⅰ2001 in the middle, and a spring Ⅱ19 mounting groove Ⅰ2002 in the middle of the limit groove; the lower slip 27 has a limit groove Ⅱ2701 in the middle, and a spring Ⅲ26 mounting groove Ⅱ2702 in the middle of the limit groove;

[0065] The middle of the double-stroke piston cylinder Ⅰ22 is provided with a liquid inlet and outlet port Ⅰ2201 and an anti-blocking net 2202, and the upper cone joint 17 is provided with a plurality of connecting holes 1701 at equal angles in the circumferential direction. Figure 7 As shown, the communicating hole 1701 coincides with the liquid inlet and outlet port Ⅰ2201 of the double-stroke piston cylinder Ⅰ22, the liquid inlet and outlet port Ⅱ2301 and the anti-blocking net 2302 are provided in the middle of the double-stroke piston cylinder Ⅱ23, and the lower cone joint 28 is provided with a plurality of communicating holes 2801 at equal angles in the circumferential direction, and the communicating hole 2801 coincides with the liquid inlet and outlet port Ⅱ2301 of the double-stroke piston cylinder Ⅱ23;

[0066] like Figures 18-19 As shown, a deep-sea methane hydrate mining and carbon dioxide storage injection integrated operation tool and method is characterized in that: in the specific engineering implementation, it includes the following steps:

[0067] SⅠ. Drilling into a natural gas hydrate reservoir includes the following steps:

[0068] Sa. Running tools: Install the lifting pump 33, the deep-sea methane hydrate mining and carbon dioxide storage injection integrated operation tool, and the hydrate drill bit 36 ​​on the coiled tubing 31, and run them into the casing 32 through the coiled tubing storage mechanism 30 on the drilling and production platform 39, and deliver them to the designated layer;

[0069] Sb. Vertical drilling: The drilling fluid enters the tool through the coiled tubing 31, passes through the oil safety joint 1 and the movable core 5, and reaches the hydrate drill bit 36, which controls the hydrate drill bit 36 ​​to drill to the target layer of the natural gas hydrate reservoir 38.

[0070] SⅡ, natural gas hydrate mining, specifically includes the following steps:

[0071] Sc. Solid fluidized production: the drilling fluid flow rate is changed, the movable barrel core 5 moves, the valve core hole III 503 and the valve core hole IV 504 coincide with the injection injection cavity 1402 inside the injection connector 14, the throttling plug 16 enters the movable barrel core 5, blocks the tail end of the movable barrel core 5, and the tool is switched to the solid fluidized production working mode. The drilling fluid is ejected through the jet injection hole 1401 on the injection connector 14, and the hydrate slurry is returned upward through the lift pump 33, and the coiled tubing 31 is pulled back to complete the solid fluidized cavity making 35 operation of the natural gas hydrate reservoir. Fig.12 As shown;

[0072] Sd, decompression production after fracturing: After the solid fluidization cavity making 35 operation of the natural gas hydrate reservoir is completed, the fracturing agent is injected from the coiled tubing 31 and sprayed out through the jet injection hole 1401 on the injection connector 14 to perform fracturing transformation on the target layer of the natural gas hydrate reservoir, and decompression production is performed after the fracturing transformation is completed;

[0073] SⅢ, carbon dioxide hydrate storage, specifically includes the following steps:

[0074] Sd. Anchoring and sealing: Drag the deep-sea methane hydrate mining and carbon dioxide storage injection integrated operation tool back to the designated position at the lower end of the casing 32, change the drilling fluid flow, move the movable barrel core 5, and the front end of the throttling plug 16 enters the movable barrel core 5. The drilling fluid flows out from the middle intercommunication hole 1601 through the through hole 1602 at the head end of the throttling plug 16. The valve core hole Ⅰ501 coincides with the inlet and outlet port Ⅰ2201 of the double-stroke piston cylinder Ⅰ22, and the valve core hole Ⅱ 502 coincides with the position of the inlet and outlet port Ⅰ2301 of the double-stroke piston cylinder Ⅱ23, and the tool switches to the anchoring and sealing working mode. The drilling fluid enters the double-stroke piston cylinder Ⅰ22 and the double-stroke piston cylinder Ⅱ23, and the pressure in the cylinder increases, pushing the tooth shaft Ⅰ21, the tooth shaft Ⅱ24, the piston shaft Ⅰ10, and the piston shaft Ⅱ13 to overcome the spring Ⅱ19 and the spring Ⅲ26 respectively, squeezing the upper slip 20, the lower slip 27, and the rubber cylinder 11 to complete the anchoring and sealing operations of the tool;

[0075] Se. Injection and sealing: After the tool is anchored and sealed, the drilling fluid flow is changed, the movable barrel core 5 moves, the valve core hole III 503 and the valve core hole IV 504 coincide with the injection injection cavity 1402 inside the injection connector 14, the throttling plug 16 enters the movable barrel core 5, seals the tail end, and the tool is switched to the carbon sequestration working mode, and the liquid carbon dioxide 34 is injected through the continuous oil pipe 31 and ejected through the jet injection hole 1401 on the injection connector 14, and carbon dioxide hydrate 37 is generated in the cavity 35 created by the solid fluidization of the natural gas hydrate reservoir 38, completing the carbon dioxide hydrate sealing operation.

[0076] Obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0077] In the description of the present invention, it should be noted that the directions or positional relationships indicated by "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are directions or positional relationships based on the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 limiting the present invention. In addition, "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0078] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0079] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0080] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention.

Claims

1. A deep-sea methane hydrate mining and carbon dioxide storage integrated operation tool, including a safety joint mechanism, a mechanical self-locking mechanism, an anchoring mechanism, a sealing mechanism, and an injection mechanism, characterized in that: The safety joint mechanism is composed of a continuous tubing joint (1), an O-ring I (2), a set screw (3), a connecting tool (4), a shear pin (29), and a movable barrel core (5). The continuous tubing joint (1) is provided with a sealing groove I (101) at the head end, a positioning installation groove (102) at the front, a shear pin groove (103) in the middle, and a conical boss (104) inside. The continuous tubing joint (1) is installed on the continuous tubing (31). Inside the end, the O-ring I (2) is installed in the sealing groove I (101) of the continuous tubing joint (1), the connecting tool (4) is installed outside the end of the continuous tubing (31), the set screw (3) is installed on the connecting tool (4), the shear pin (29) is installed in the middle shear pin groove (103) of the continuous tubing joint (1), and the head end of the movable barrel core (5) is in contact with the conical boss (104) of the continuous tubing joint (1); The mechanical self-locking mechanism is composed of a switching self-locking joint (6), a bevel guide ring (7), a thrust bearing (8), and a spring I (9): the head end of the switching self-locking joint (6) is installed inside the continuous oil pipe joint (1), the tail end of the bevel guide ring (7) is provided with a tail groove (701), which is sleeved on the head end of the movable barrel core (5), the thrust bearing (8) is installed in the tail groove (701) of the bevel guide ring (7), and the spring I (9) is sleeved outside the movable barrel core (5), and the head end is in contact with the thrust bearing (8); The anchoring mechanism is composed of an upper cone joint (17), a slip cover I (18), a spring II (19), an upper slip (20), a tooth shaft I (21), a double-stroke piston cylinder I (22), a double-stroke piston cylinder II (23), a tooth shaft II (24), a slip cover II (25), a spring III (26), a lower slip (27), and a lower cone joint (28): the upper cone joint (17) is sleeved outside the movable cylinder core (5), the head end of which is connected to the outer layer of the switch self-locking joint (6), a boss (1704) is provided inside to contact the end of the spring I (9), an inclined surface I (1703) is provided outside to contact the upper slip (20), and a concave platform I (1702) is also provided in the middle; the double-stroke piston cylinder I (22) is installed outside the upper cone joint (17), the head end of the tooth shaft I (21) is in contact with the tail of the upper slip (20), and the tail end is installed on the double-stroke piston Inside the front end of the cylinder I (22), the front end of the slip cover I (18) is connected to the middle concave platform I (1702) of the upper cone joint (17), and the rear end is connected to the front end of the double-stroke piston cylinder I (22). The spring II (19) is installed between the upper slip (20) and the slip cover I (18). The lower cone joint (28) is sleeved outside the movable cylinder core (5), and the front end is connected to the rear end of the upper cone joint (17). An inclined surface II (2803) is provided on the outside to contact the tail of the lower slip (27), and a concave platform II (2802) is provided in the middle. The double-stroke piston cylinder II (23) is installed on the outside of the lower cone joint (28). The head end of the tooth shaft II (24) contacts the tail of the lower slip (27), and the tail end is installed inside the head end of the double-stroke piston cylinder II (23). The spring III (26) is installed between the lower slip (27) and the slip cover II (25). The sealing mechanism is composed of a piston shaft I (10), a rubber cylinder (11), a spacer ring (12), a piston shaft II (13), and an O-ring II (15): the rubber cylinder (11) is sleeved on the tail of the upper cone joint (17), the spacer ring (12) is installed between the rubber cylinder (11) and sleeved on the tail of the upper cone joint (17), the front end of the piston shaft I (10) contacts the rubber cylinder (11), and the rear end is installed inside the end of the double-stroke piston cylinder I (22), the front end of the piston shaft II (13) contacts the rubber cylinder (11), and the rear end is installed inside the end of the double-stroke piston cylinder II (23), and the O-ring II (15) is arranged in groups of two and is respectively installed on the movable cylinder core (5); The injection mechanism is composed of an injection connector (14) and a throttling plug (16): the head end of the injection connector (14) is connected to the tail end of the lower cone joint (28), and the throttling plug (16) is installed inside the tail end of the injection connector (14).

2. The deep-sea methane hydrate mining and carbon dioxide storage integrated operation tool according to claim 1 is characterized by: The movable cylinder core (5) is provided with a plurality of limit bosses (501) at equal angles on the outside of the head end, a pressure drop slope (507) is provided on the inside of the head end, a plurality of valve core holes I (502), a plurality of valve core holes II (503), a plurality of valve core holes III (504), and a plurality of valve core holes IV (505) are provided at equal angles on the circumference of different axial sections of the valve body of the movable cylinder core (5), and a plurality of groups of sealing grooves II (506) are provided on different axial sections of the valve body of the movable cylinder core (5).

3. The deep-sea methane hydrate mining and carbon dioxide storage integrated operation tool according to claim 1 is characterized by: The switching self-locking joint (6) is provided with a self-locking shoulder (601) at the head end, a shear pin groove (602) in the middle, and self-locking guide slopes (603) of different lengths at the tail end to match the slope guide ring (7).

4. The deep-sea methane hydrate mining and carbon dioxide storage integrated operation tool according to claim 1 is characterized by: The injection connector (14) is axially provided with a plurality of groups of jet injection holes (1401) arranged in a circumferential spiral, and is provided with a jet injection cavity (1402) inside. The jet injection holes (1401) are connected to the jet injection cavity (1402), and a throttling plug (16) mounting platform (1403) is provided inside the end.

5. The deep-sea methane hydrate mining and carbon dioxide storage integrated operation tool according to claim 1 is characterized by: The throttling plug (16) has a plurality of interconnected holes (1601) formed at equal angles in the middle, a through hole (1602) formed at the head end and connected to the circumferential interconnected holes (1601) in the middle, and a mounting bolt (1603) is provided at the tail end.

6. The deep-sea methane hydrate mining and carbon dioxide storage integrated operation tool according to claim 1 is characterized by: The upper cava (20) has a limiting groove I (2001) in the middle, and a spring II (19) mounting groove I (2002) in the middle of the limiting groove; the lower cava (27) has a limiting groove II (2701) in the middle, and a spring III (26) mounting groove II (2702) in the middle of the limiting groove.

7. The deep-sea methane hydrate mining and carbon dioxide storage integrated operation tool according to claim 1 is characterized by: The double-stroke piston cylinder I (22) is provided with a liquid inlet and outlet port I (2201) and an anti-blocking net (2202) in the middle, the upper cone joint (17) is provided with a plurality of connecting holes (1701) at equal angles in the circumferential direction, and the connecting holes (1701) coincide with the positions of the liquid inlet and outlet port I (2201) of the double-stroke piston cylinder I (22), the double-stroke piston cylinder II (23) is provided with a liquid inlet and outlet port II (2301) and an anti-blocking net (2302) in the middle, and the lower cone joint (28) is provided with a plurality of connecting holes (2801) at equal angles in the circumferential direction, and the connecting holes (2801) coincide with the positions of the liquid inlet and outlet port II (2301) of the double-stroke piston cylinder II (23).

8. A method for integrating deep-sea methane hydrate mining and carbon dioxide storage, characterized in that: The deep-sea methane hydrate mining and carbon dioxide storage injection integrated operation tool according to any one of claims 1 to 7 comprises the following steps: SⅠ. Drilling into a natural gas hydrate reservoir includes the following steps: Sa. Running tools: installing a lifting pump (33), a deep-sea methane hydrate exploitation and carbon dioxide storage injection integrated operation tool, and a hydrate drill bit (36) on a coiled tubing (31), running them into a casing (32) through a coiled tubing storage mechanism (30) on a drilling and production platform (39), and delivering them to a designated layer; Sb. Vertical drilling: Drilling fluid enters the tool through the continuous oil pipe (31), passes through the oil safety joint (1) and the movable core (5), and reaches the hydrate drill bit (36), and controls the hydrate drill bit (36) to drill to the target layer of the natural gas hydrate reservoir (38). SⅡ, natural gas hydrate mining, specifically includes the following steps: Sc. Solid fluidized production: the drilling fluid flow rate is changed, the movable barrel core (5) is moved, the valve core hole III (503) and the valve core hole IV (504) coincide with the injection injection cavity (1402) inside the injection connector (14), the throttling plug (16) enters the movable barrel core (5), blocks the rear end of the movable barrel core (5), and the tool is switched to the solid fluidized production working mode. The drilling fluid is ejected through the jet injection hole (1401) on the injection connector (14), the hydrate slurry is returned upward through the lifting pump (33), and the coiled tubing (31) is pulled back to complete the solid fluidized cavity making (35) operation of the natural gas hydrate reservoir; Sd, decompression production after fracturing: after the solid fluidization cavity making (35) operation of the natural gas hydrate reservoir is completed, the fracturing agent is injected from the coiled tubing (31) and sprayed out through the jet injection hole (1401) on the injection connector (14) to perform fracturing transformation on the target layer of the natural gas hydrate reservoir, and decompression production is performed after the fracturing transformation is completed; SⅢ, carbon dioxide hydrate storage, specifically includes the following steps: Sd, anchoring, sealing: The deep-sea methane hydrate mining and carbon dioxide storage injection integrated operation tool is dragged back to the designated position at the lower end of the casing (32), the drilling fluid flow rate is changed, the movable barrel core (5) is moved, the front end of the throttling plug (16) enters the movable barrel core (5), and the drilling fluid flows out from the middle intercommunication hole (1601) through the through hole (1602) at the head end of the throttling plug (16), the valve core hole I (501) and the inlet and outlet port I (2201) of the double-stroke piston cylinder I (22) coincide with each other, and the valve core hole II (502 ) coincides with the position of the inlet and outlet port I (2301) of the double-stroke piston cylinder II (23), the tool switches to the anchoring and sealing working mode, the drilling fluid enters the double-stroke piston cylinder I (22) and the double-stroke piston cylinder II (23), the pressure in the cylinder increases, pushing the tooth shaft I (21), the tooth shaft II (24), the piston shaft I (10), and the piston shaft II (13) to overcome the spring II (19) and the spring III (26) respectively, squeezing the upper slip (20), the lower slip (27), and the rubber cylinder (11) to complete the anchoring and sealing operations of the tool; Se. Injection sealing: After the tool is anchored and sealed, the drilling fluid flow is changed, the movable barrel core (5) moves, the valve core hole III (503) and the valve core hole IV (504) coincide with the injection injection cavity (1402) inside the injection connector (14), the throttling plug (16) enters the movable barrel core (5), seals the tail end, and the tool is switched to the carbon sequestration working mode, and liquid carbon dioxide (34) is injected through the continuous oil pipe (31) and ejected through the jet injection hole (1401) on the injection connector (14), generating carbon dioxide hydrate (37) in the cavity (35) created by solid fluidization of the natural gas hydrate reservoir (38), completing the carbon dioxide hydrate sealing operation.

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