JP2011031154A - Storage of carbon dioxide in shallow aquifer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for restraining the consumption of energy required for carrying water to be supplied and dissolving carbon dioxide in the water when the carbon dioxide is dissolved and stored in the water. <P>SOLUTION: Carbon dioxide to be stored is pressurized with a pressure-applying device 10 installed on the ground, and the pressurized carbon dioxide is fed from a carbon dioxide-feeding port 3 provided at the upper end of an injection well 1. Further, underground water, seawater or salt water, is pumped up from a water-taking port 8 of a water-pumping well installed in an underground aquifer of hydraulic pressure of 5-50 atmosphere in which underground water, seawater or salt water in which the carbon dioxide is to be stored, exists, and the pressurized carbon dioxide fed from a carbon dioxide-feeding port 4 provided in the underground part of the injection well is fed to the underground water, the seawater or the salt water to mix the pressurized carbon dioxide with the underground water, the seawater or the salt water to dissolve the carbon dioxide in the water. Then, the carbon dioxide concerned is discharged from a discharging port 5 provided at the lower end of the injection well in the underground aquifer, in which the underground water, seawater or salt water of hydraulic pressure of 5-50 atmosphere exists, to store the carbon dioxide. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  This invention resides in carbon capture and storage and sequestration techniques for global warming suppression.

Increasing the amount of carbon dioxide emitted into the atmosphere due to recent production and distribution activities brings about climate change and is expected to have a serious impact on a wide global area (non-patent literature) 1).
For this reason, suppressing the amount of carbon dioxide emitted into the atmosphere is an urgent issue to be solved globally and needs to be solved urgently.
As a measure to reduce carbon dioxide emissions, it is necessary to develop Carbon Capture and Storage (CCS), a technology for storing and sequestering carbon dioxide, and the research is being promoted worldwide. ing.
The most promising method in CCS is to inject and store supercritical carbon dioxide into an underground aquifer having a depth of about 1000 m or more (Non-patent Document 2). The present inventors are also actively working on this problem.

  Carbon dioxide in the case of carbon capture and storage and sequestration is a supercritical carbon dioxide. Carbon dioxide in the supercritical state has a lower density than groundwater. It is considered that a sufficiently large sealing layer (cap lock) is required on the upper part of the carbon dioxide storage / separation site. This is because the attempts to prevent the supercritical carbon dioxide from leaking to the ground. The cap lock does not exist in a geographically limited area, and when the generated carbon dioxide is transported to an area where the cap lock exists, and carbon dioxide is stored and sequestered, a large cost is required. Is limited to resolving carbon capture and storage and sequestration in areas cap lock exists in that sense.

Rather than storing and sequestering carbon dioxide as a supercritical state, it can be injected and stored in the ground in a state dissolved in water (including fresh water, seawater, and brine). Specifically, it is as follows.
Sending carbon dioxide dissolved in water (Patent Document 2 Japanese Patent Laid-Open No. 3-188924), carbon dioxide gas is microbubbled and dispersed in water, carbon dioxide gas is microbubbled and dispersed in water, compared to the conventional case Liquid carbon dioxide is efficiently converted into liquid carbon dioxide or carbon dioxide hydrate microparticles (Patent Document 7 Japanese Patent Application Laid-Open No. 2004-050167), bubbled and mixed with injected water (Patent Document 3) No. 2008-6367), and pumping carbon dioxide into seawater in a liquefied state (Patent Document 4 JP 2000-227085 A) are known. The groundwater of the deep aquifer is pumped from the pumping well to make injection water, and the injected water is injected by applying pulsation pressure to the injection well provided to reach the deep aquifer. In addition, there is an invention in which carbon dioxide is bubbled and mixed or dissolved (Patent Document 8, Japanese Patent Application Laid-Open No. 2008-307383).
It is also known that hydrate is generated and stored (Japanese Patent Application Laid-Open No. 2003-284940).

  Water containing dissolved carbon dioxide several% density is higher than the ground water undissolved. Therefore, it is said that the possibility of carbon dioxide leaking to the ground is lower than that of supercritical carbon dioxide having a low density. In this case, because it does not require a cap lock, there is an advantage that fewer geographical constraints. The present inventors have made it possible to store carbon dioxide at a shallower depth (50 to 500 m) than the above-mentioned CCS method by dissolving carbon dioxide in water and storing it in the ground. The invention of the CCS corresponding to the distributed emission source is completed (Japanese Patent Application No. 2008-296580). Then, the method could be established with the new carbon capture and storage and sequestration techniques.

A carbon dioxide gas compression device that compresses carbon dioxide gas to a liquid or supercritical state, a pressure pump that compresses and conveys a solvent composed of seawater and / or water, a compressed carbon dioxide gas and a solvent are injected, and carbon dioxide gas is injected into the solvent. It is composed of one or a plurality of dissolution tanks to be dissolved into carbon dioxide-dissolved water, and an injection well penetrating from the ground surface to the aquifer where the generated carbon dioxide-dissolved water is pressed into the ground aquifer, The dissolution tank has a carbon dioxide gas inlet through which a carbon dioxide gas sent from a carbon dioxide compressor is injected and a solvent inlet through which a solvent sent from a solvent pump is injected into a lower part of a sealed container. There is an invention (Patent Document 9 Japanese Patent Application Laid-Open No. 2008-238054) that is formed and filled with a granular filler in a container.
In addition, when the carbon dioxide gas is bubbled into the solvent efficiently and with high processing capacity under high pressure conditions, the carbon dioxide gas supply line that externally fits the main flow line through which the solvent is flowed at a predetermined high flow rate is provided. It arrange | positions, a pore is formed in the pipe wall surface which partitions off the said solvent and carbon dioxide, The said carbon dioxide is mixed in a solvent, making it foam fine with the shear force of the solvent which flows through the said mainstream pipe 30. At this time, the flow rate of the solvent and the pore diameter of the pores are set so that the Weber number (We) is 10 or more (Japanese Patent Application Laid-Open No. 2009-112995).
In addition, as a method of isolating carbon dioxide gas in the deep sea, low-purity carbon dioxide gas is injected into the short leg tube of the reverse J-shaped tube in the sea, and the carbon dioxide gas is dissolved in seawater while rising in the existing pipe. Then, a method of discharging into the deep sea from the long legs of the existing pipe is confirmed (Patent Document 11 JP 2000-70702 A).

As can be understood from the above description, in the conventional method in which carbon dioxide is dissolved in water and sent to the storage portion, a method of mixing carbon dioxide with water on the ground is adopted. In these methods, it is necessary to pressurize water to the same extent as carbon dioxide on the ground. When carbon dioxide-dissolved water is to be injected into the ground, pressurization by hydrostatic pressure is further applied to the carbon dioxide-dissolved water. Therefore, at the outlet of the injection well, in addition to the energy for producing the carbon dioxide-dissolved water on the ground, the pressurizing energy by the hydrostatic pressure of the carbon dioxide-dissolved water is required.
For example, when injecting dissolved water having a carbon dioxide partial pressure of 20 atm at a depth of 200 m, the carbon dioxide-dissolved water needs to be pressurized to 20 atm on the ground in order to dissolve carbon dioxide, The total pressure becomes about 40 atm by pressurization by hydrostatic pressure at the release point (the differential pressure at the release point is about 20 atm). On the other hand, if the carbon dioxide partial pressure is about 1 atm, the differential pressure at the release point is about 1 atm, but the amount of carbon dioxide that can be stored is reduced.
The existence of differential pressure in this way leads to a large change in the water pressure near the injection point, and there is a concern that the possibility of leakage to the surface due to the destruction of the geological structure and the widespread diffusion of carbon dioxide-dissolved water will increase. Is done.
Therefore, it is necessary to take measures such as installing a back pressure control valve at the injection well outlet. In this case, since the energy reduced by the control valve is wasted, there is a concern that the energy required for injecting the carbon dioxide-dissolved water increases.

In a method of storing carbon dioxide dissolved in water, an important solution is how to suppress energy required for supplying water to be used. Next, it is important to solve how carbon dioxide, which is a gas, is stored as a sufficiently dissolved state in water. There is an urgent need for technological development to solve these problems.
Japanese Patent Application No. 2008-296580 Japanese Patent Laid-Open No. 3-188924 JP 2008-6367 A JP 2000-227085 A JP 2003-284940 A JP 2006-88129 A JP 2004-50167 A JP 2008-307383 A JP 2008-238504 A JP 2009-112995 A JP 2000-70702 A IPCC, IPCC 4th assessment report, Working Group I Report “The Physical Science Basis”, 2007, Cambridge University Press IPCC, “IPCC Special Report on Carbon Dioxide Capture and Storage”, Chapter 5, 2005, Cambridge University Press Peebles, F.E. N. and Garber, H .; J. et al. : Studies on the motion of gas bubbles in liquids, Chemical Engineering Progress. , 49-2 (1953), 88-97.

  The problem to be solved by the present invention is how to suppress the energy required for supplying the water to be used, and then the state in which carbon dioxide, which is a gas, is effectively sufficiently dissolved in water It is to solve that it stores.

The present inventors diligently addressed the above-mentioned problems and found the following points to complete the present invention.
(1) (A) In the ground where underground water, seawater or flood water exists, after mixing carbon dioxide pressurized on the ground with water, as seen in conventional methods, When the aquifer is supplied from an injection well and stored, a large differential pressure is generated at the injection site, and it is necessary to reduce the pressure through a control valve or the like. In order to improve this, the following improvements were made.
(Ii) Pressurize the carbon dioxide to be stored with a pressurizing device installed on the ground, supply the pressurized carbon dioxide from the carbon dioxide supply port at the top of the injection well, and store the carbon dioxide. The underground water, seawater or flooded water is collected from the water intake of the pumping well provided in the underground aquifer where the underground water, seawater or inundated water exists. Pressurized carbon dioxide supplied from a carbon dioxide supply port provided in the middle part is supplied to underground water, seawater or brine, and the pressurized carbon dioxide is supplied to underground water, seawater or brine. Mixed and dissolved in the groundwater, 5-50 atm underground water, seawater or underground water in which the carbon dioxide is dissolved from the outlet at the lower end of the injection well provided in the underground aquifer Released as a mixture with water, seawater or brine A carbon dioxide storage method for storing carbon dioxide.
As a result, at the underground water, seawater, or brine supply port located in the middle of the injection well, the differential pressure can be made lower than in the conventional case, reducing the energy loss due to pressure reduction due to control valves, etc. And found that a part of the required energy can be suppressed.
(2) (A) Supplying pressurized carbon dioxide supplied from the carbon dioxide supply port provided in the injection well to underground water, seawater or brine, and supplying the pressurized carbon dioxide underground When mixing with water, seawater or brine, the solution is to increase the dissolution rate of carbon dioxide and increase the dissolution rate as much as possible.
In order to increase the amount of carbon dioxide dissolved under the above conditions, it is necessary to increase the carbon dioxide concentration in water such as underground water, seawater, or brine. It is known that the increasing rate of the carbon dioxide concentration follows the formula shown by the following formula.
F _w (Kg / m ³ / s) is an increase rate of carbon dioxide concentration in water due to dissolution of carbon dioxide in water.
In the equation, k is a coefficient called exchange rate (m / s). Specifically, it is a constant defined by the strength of the turbulence of the liquid phase.
S (Kg / m ³ / atm) and ΔfCO ₂ (atm) represent the difference between the carbon dioxide solubility in the liquid phase, the pressure of carbon dioxide gas, and the carbon dioxide partial pressure of water, respectively.
A / V represents the total surface area (m ² / m ³ ) of the gas-liquid interface per unit volume for carbon dioxide bubbles.
Rw is the volume ratio (m ³ / m ³ ) of water per unit volume required by carbon dioxide.
Among these parameters, the parameters other than k and A / V are determined by the injection rate of carbon dioxide into the ground and the ground conditions. Therefore, in order to directly increase the dissolution rate of carbon dioxide, k and It can be said that it is effective to increase A / V.
k is a constant defined by the strength of the turbulence of the liquid phase. It is a constant that can be determined from the flow results from experiments.
A / V is a value determined according to carbon dioxide bubbles generated when carbon dioxide is actually dissolved. In order to increase the value of A / V, specifically, to increase the gas-liquid interface per unit volume, it is known as a general method to make carbon dioxide gas into fine bubbles ( For example, patent document 3 Unexamined-Japanese-Patent No. 2008-6367). In the above method, carbon dioxide bubbles and water as a solvent are mixed on the ground and injected into the deep sea from the ground. In the method of the present invention, the present inventors determined by an original method.
The contents determined by experiments are as follows.
(3) Underground water, seawater, or flooded water from a water intake of a pumping well provided in a groundwater aquifer having a water pressure of 5 to 50 atmospheres where underground water, seawater, or flood water in which the carbon dioxide is to be stored are present. The pressurized carbon dioxide supplied from the carbon dioxide supply port provided in the underground part of the injection well is supplied to the underground water, seawater or brine, and the pressurized dioxide Mixing and dissolving carbon in underground water, seawater, or brine, the volume ratio of pressurized carbon dioxide to underground water, seawater, or brine (carbon dioxide / groundwater, seawater, or brine) is 0.2. Under the following conditions, carbon dioxide is mixed with underground water, seawater, or brine in the form of bubbles with a diameter of 5 mm or less, and the flow rate is higher than the rising speed of bubbles by a pump installed on the ground or injection well. Of water, seawater or A mixed-phase flow of flooded water is made to flow down in the injection well, and carbon dioxide is dissolved in underground water, seawater or brine in the dissolution zone in the injection well. The present inventors have found this point through experiments.
The bubble-shaped point having a diameter of 5 mm or less forms a bubble having a diameter of 5 mm or less by the bubble generating means.
(4) Underground water, seawater, or flooded water from a water intake of a pumping well provided in a groundwater aquifer having a water pressure of 5 to 50 atmospheres where underground water, seawater, or flood water in which the carbon dioxide is to be stored exists. The pressurized carbon dioxide supplied from the carbon dioxide supply port provided in the underground part of the injection well is supplied to the underground water, seawater or brine, and the pressurized dioxide Mixing and dissolving carbon in underground water, seawater, or brine, the volume ratio of pressurized carbon dioxide to underground water, seawater, or brine (carbon dioxide / groundwater, seawater, or brine) is 0.2. Under the following conditions, carbon dioxide is mixed with underground water, seawater, or brine in the form of bubbles with a diameter of 5 mm or less, and the flow rate is higher than the rising speed of bubbles by a pump installed on the ground or injection well. Of water, seawater or Carbon dioxide is dissolved in underground water, seawater, or brine in the melting section of the injection well as a spiral flow by using a mixed-phase flow of brine and using a static stirrer.
(5) Underground water, seawater or flooded water from a water intake of a pumping well provided in a groundwater aquifer having a water pressure of 5 to 50 atmospheres where underground water, seawater or flood water in which the carbon dioxide is to be stored exists. The pressurized carbon dioxide supplied from the carbon dioxide supply port provided in the underground part of the injection well is supplied to the underground water, seawater or brine, and the pressurized dioxide Mixing and dissolving carbon in underground water, seawater, or brine, the volume ratio of pressurized carbon dioxide to underground water, seawater, or brine (carbon dioxide / groundwater, seawater, or brine) is 0.2. Under the following conditions, carbon dioxide is mixed with underground water, seawater, or brine in the form of bubbles with a diameter of 5 mm or less, and the flow rate is higher than the rising speed of bubbles by a pump installed on the ground or injection well. Of water, seawater or Carbon dioxide is dissolved in underground water, seawater, or brine in the dissolution zone in the injection well by passing it through a structure that reduces the cross-sectional area of the injection well as a multiphase flow of brine.
(6) Underground water, seawater, or flooded water from a water intake of a pumping well provided in a groundwater aquifer having a water pressure of 5 to 50 atmospheres where underground water, seawater, or flood water in which carbon dioxide is to be stored are present. The pressurized carbon dioxide supplied from the carbon dioxide supply port provided in the underground part of the injection well is supplied to the underground water, seawater or brine, and the pressurized dioxide Mixing and dissolving carbon in underground water, seawater or brine to separate and supply carbon dioxide from multiple carbon dioxide supply ports provided in the injection well, mix and pressurize carbon dioxide and underground Water, seawater or brine water volume ratio (carbon dioxide / groundwater, seawater or brine) is 0.2 or less, and carbon dioxide is mixed with underground water, seawater or brine as bubbles with a diameter of 5 mm or less Set on the ground or in the injection well A mixed pump of carbon dioxide and underground water, seawater, or brine is used, and the carbon dioxide is dissolved in underground water, seawater, or brine in the dissolution zone in the injection well.
(7) Underground water, seawater or flooded water from the sampling well of the pumping well provided in the underground aquifer where the underground water, seawater or flood water in which the carbon dioxide is to be stored is present. The pressurized carbon dioxide supplied from the carbon dioxide supply port provided in the underground part of the injection well is supplied to the underground water, seawater or brine, and the pressurized dioxide Mixing and dissolving carbon in underground water, seawater or brine to separate and supply carbon dioxide from multiple carbon dioxide supply ports provided in the injection well, pressurized carbon dioxide and underground water The volume ratio of seawater or brine (carbon dioxide / groundwater, seawater or brine) is 0.2 or less, and carbon dioxide is mixed with underground water, seawater or brine as bubbles with a diameter of 5 mm or less, Installed on the ground or in the injection well The mixed flow of carbon dioxide and underground water, seawater, or brine is higher than the bubble rising speed by the pump, and by using a static stirrer, it is allowed to flow down as a spiral flow and carbon dioxide is dissolved in the dissolution zone in the injection well. Dissolve in underground water, seawater or brine.
(8) Underground water, seawater, or flooded water from a water intake of a pumping well provided in a groundwater aquifer having a water pressure of 5 to 50 atmospheres where underground water, seawater, or flood water in which the carbon dioxide is to be stored are present. The pressurized carbon dioxide supplied from the carbon dioxide supply port provided in the underground part of the injection well is supplied to the underground water, seawater or brine, and the pressurized dioxide Mixing and dissolving carbon in underground water, seawater or brine will split and supply carbon dioxide from multiple carbon dioxide supply ports provided in the injection well, The volume ratio of water, seawater or brine (carbon dioxide / underground water, seawater or brine) is in a state of 0.2 or less, and carbon dioxide is mixed with underground water, seawater or brine in the form of bubbles having a diameter of 5 mm or less, Installed on the ground or in the injection well The flow rate is higher than the rising speed of the bubbles by the pump, and it is made to flow through the structure that reduces the cross-sectional area of the injection well by making it a mixed phase flow of carbon dioxide and underground water, seawater or brine. Carbon dioxide is dissolved in underground water, seawater or brine in the dissolution zone.

  According to the present invention, the pressurized carbon dioxide supplied from the carbon dioxide supply port of the injection well in a state where the carbon dioxide is pressurized is supplied to underground water, seawater or brine, and the pressurized Carbon dioxide is mixed and dissolved in underground water, seawater or brine, and the outlet at the lower end of the injection well provided in the underground aquifer where underground water, seawater or brine is present at a water pressure of 5 to 50 atmospheres. Thus, carbon dioxide is released as a mixture with underground water, seawater or brine in which carbon dioxide is dissolved. Between ground water, seawater or brine collected from underground at the same depth as the discharge port of underground water, seawater or brine that dissolves carbon dioxide, and between the inlet and outlet of the injection well. Compared with the conventional method of mixing carbon dioxide and water as a solvent by mixing in the mixing section, since the differential pressure at the injection point of the injection well can be reduced, Energy loss can be reduced. In addition, carbon dioxide is mixed with underground water, seawater, or brine under specific conditions in underground water, seawater, or brine, and carbon dioxide can be sufficiently contained.

The present invention will be described with reference to FIG.
Carbon dioxide generated from a distributed power generation system (not shown) is sent to the upper end of the injection well 1 through the separation and recovery device 10 and the pressurizing equipment 11, and the carbon dioxide supply port 3 provided in the injection well 1. Then, it is fed into the injection well 1. The pressure applied to the carbon dioxide injected into the injection well 1 is a pressure calculated from a loss head necessary for supplying a supply amount for storing carbon dioxide in a place where carbon dioxide is to be stored.
Underground water, seawater, or flooded water is collected from a water sampling port 8 provided in an underground aquifer of 5-50 atm. The pressurized carbon dioxide from the carbon dioxide supply port 4 provided in the underground portion of the injection well with respect to the underground water, seawater or brine sent from the water, seawater or brine water distribution pipe 13 Supply carbon, mix the pressurized carbon dioxide with underground water, seawater or brine, dissolve carbon dioxide in underground water, seawater or brine, and subsurface water and seawater with a water pressure of 5 to 50 atmospheres Or it discharge | releases from the discharge port 5 of the lower end of the injection well provided in the underground aquifer in which a flood water exists as a mixture which melt | dissolved the carbon dioxide in underground water, seawater, or the brine, and stores a carbon dioxide. The level of underground water, seawater, or flooded water sent by underground water, seawater, or flooded water distribution pipes 13 is determined according to the height of the installation location and the ease of operation when installed at the installation location. Consider the above. FIG. 1 shows a case of equipment provided in seawater without pumping the ground.

FIG. 2 shows a sample of water collected from a water intake of a pumping well provided in a groundwater aquifer having a water pressure of 5 to 50 atmospheres where underground water, seawater, or flood water in which carbon dioxide is to be stored exists. After pumping up, the case where pressurized carbon dioxide supplied from a carbon dioxide supply port is supplied to the underground water, seawater or brine is supplied to the brine through the distribution pipe.
Carbon dioxide generated from a distributed power generation system (not shown) is sent to the upper end of the injection well 1 via the separation and recovery device 10 and the pressurizing equipment 11, and from the carbon dioxide supply port 3 provided in the injection well 1. To the injection well 1. The pressure applied to the carbon dioxide injected into the injection well 1 is a pressure calculated from a loss head necessary for supplying a supply amount for storing carbon dioxide in a place where carbon dioxide is to be stored.
On the other hand, underground water, seawater or flooded water from a sampling port 8 of a pumping well 6 provided in a groundwater aquifer having a water pressure of 5 to 50 atmospheres where underground water, seawater or flooded water in which carbon dioxide is to be stored exists. The water is pumped up to the ground, and then supplied to the underground portion of the injection well via the supply pipe 7 installed on the ground, through the underground water, seawater, or brine distribution pipe 13 in the injection well. The pressurized carbon dioxide supplied from the carbon dioxide supply port 4 is supplied to the submerged water in underground water, seawater or brine, mixed with the pressurized carbon dioxide, Dissolved in underground water, seawater or brine, and from the outlet 5 at the lower end of the injection well provided in the underground aquifer where the underground water, seawater or brine is present at a water pressure of 5 to 50 atmospheres, As a mixture of carbon dioxide dissolved in water, seawater or brine Release, and storing the carbon dioxide.

In any one of the above carbon dioxide storage methods, the discharge port 5 at the lower end of the injection well provided in the underground aquifer where the underground water, seawater or flood water having a water pressure of 5 to 50 atmospheres exists, and the underground It is necessary to set a certain distance for the well 8 of the pumping well provided in the groundwater aquifer having a water pressure of 5 to 50 atmospheres where carbon dioxide in which water, seawater or brine is present is stored. The underground water, seawater or brine collected from the sampling well 8 of the pumping well 6 and the underground water, seawater or brine mixture in which carbon dioxide released from the outlet 5 at the lower end of the injection well is dissolved are not combined. It is consideration to make it. If this distance is increased, there will be no problem, but the necessity for underground water, seawater or dredged water sampled from the sampling port 8 of the pumping well 6 results in increased power costs. As a result of discharging carbon dioxide-dissolved water to a tank simulating Examples 1 and 2 and an aquifer described later and sampling water in a simulated aquifer around the discharge point, the aquifer stored horizontally from the discharge port It is determined from the result that it is effective to be installed at a distance of 5 times or more the thickness of the layer.
In consideration of changing according to the installation location, the numerical value may change.

When supplying pressurized carbon dioxide supplied from a carbon dioxide supply port to underground water, seawater or brine, and mixing the pressurized carbon dioxide with underground water, seawater or brine, The following conditions are adopted every time the amount of carbon dissolved is increased and the dissolution rate is increased.
Collect underground water, seawater or brine from the sampling well provided in the underground aquifer where the underground water, seawater or inundation where carbon dioxide is to be stored exists. The pressurized carbon dioxide supplied from the carbon dioxide supply port 4 provided in the underground part of the injection well is supplied to underground water, seawater or brine, and the pressurized carbon dioxide is underground The volume ratio of pressurized carbon dioxide to underground water, seawater, or brine (carbon dioxide / groundwater, seawater, or brine) is 0.2 or less. Yes, carbon dioxide in the form of bubbles with a diameter of 5 mm or less and mixed with underground water, seawater or brine, and carbon dioxide and underground water at a flow rate higher than the rising speed of the bubbles by a pump installed on the ground or injection well, Mixed seawater or brine And the flow, through the injection well by a stream of water carbon dioxide underground in dissolution zone 2 in injection well, is dissolved in sea water or brine.
The adjustment of the gas-liquid volume flow ratio (carbon dioxide / water) in the melting section of the injection well to a state of 0.2 or less was confirmed and determined by an example described later. Exceeding 0.2 is not appropriate as a result of the excessive presence of carbon dioxide. It is not preferable to further reduce the gas-liquid volume flow ratio (carbon dioxide / water) from 0.2, which ultimately leads to a reduction in the amount of carbon dioxide stored. The lower limit can be set to a value smaller than this value. In this case, the amount of carbon dioxide that can be stored also decreases.
Supplying carbon dioxide in the form of bubbles having a diameter of 5 mm or less is effective for mixing and dissolving. In order to make carbon dioxide into bubbles having a diameter of 5 mm or less, the carbon dioxide is supplied through a supply port of carbon dioxide having a small hole diameter.
Taking the preconditions of FIGS. 1 and 2 as an example, carbon dioxide needs to have a volumetric flow rate of 20% or less of the volumetric flow rate of underground water, seawater or brine. The volumetric flow rate of underground water, seawater or brine is determined by the amount and depth of carbon dioxide stored, and is 289 l / min under the conditions of FIG. Therefore, the volume flow rate of carbon dioxide needs to be 58 l / min.
Regarding the flow rate of the multiphase flow, the rising speed of the bubbles having a diameter of 5 mm or less is 0.4 m / s at the maximum from the document of Non-Patent Document 3, so that the bubbles can flow down at a flow rate higher than that. In consideration of the volume flow of the above-mentioned underground water, seawater or brine, and carbon dioxide, if a pump that can press-fit only the volume flow described above is used for a press-fit well having a diameter of 12 cm or less, the required flow rate can be obtained. .

When performing the above treatment, carbon dioxide is dissolved in underground water, seawater or brine in the melt zone in the injection well as a spiral flow by using a mixed phase flow of carbon dioxide and underground water, seawater or brine and using a static stirrer. It is done.
Underground water, seawater or dredged water is collected from the water intake 8 of the pumping well provided in the underground aquifer where the underground water, seawater or flood water in which carbon dioxide is to be stored exists. The pressurized carbon dioxide supplied from the carbon dioxide supply port 4 provided in the underground portion of the injection well is supplied to the underground water, seawater or brine, and the pressurized carbon dioxide is supplied. Mixing and dissolving in underground water, seawater or brine, the volume ratio of pressurized carbon dioxide to underground water, seawater or brine (carbon dioxide / groundwater, seawater or brine) is 0.2 or less Carbon dioxide and underground water, which is in a state, is mixed with underground water, seawater or brine in the form of bubbles with a diameter of 5 mm or less, and the flow rate is higher than the rising speed of the bubbles by a pump installed on the ground or injection well. , Seawater or brine And phase flow, by using a static stirrer to dissolve the carbon dioxide in the dissolution section 2 in injection well as spiral flow of water underground, the sea water or brine.

Dissolve carbon dioxide in underground water, seawater, or brine in the melting section of the injection well by passing it through a structure that reduces the cross-sectional area of the injection well, using a mixed phase flow of carbon dioxide and underground water, seawater, or brine. It is also effective to make it.
Collect underground water, seawater or brine from the sampling well provided in the underground aquifer where the underground water, seawater or inundation where carbon dioxide is to be stored exists. The pressurized carbon dioxide supplied from the carbon dioxide supply port provided in the underground part of the injection well is supplied to underground water, seawater or brine, and the pressurized carbon dioxide is supplied to the underground Mixing and dissolving in water, seawater or brine will cause the volume ratio of pressurized carbon dioxide to underground water, seawater or brine (carbon dioxide / groundwater, seawater or brine) to be 0.2 or less , Carbon dioxide in the form of bubbles with a diameter of 5 mm or less and mixed with underground water, seawater or brine, and the flow rate higher than the rising speed of bubbles by a pump installed on the ground or injection well, carbon dioxide and underground water, seawater Or mixed phase And then, passing the structure in to reduce the cross-sectional area of the injection well.
The structure in which the cross-sectional area of the pipe is reduced refers to a pipe orifice, a nozzle, and a venturi pipe.

It is effective to divide and supply carbon dioxide from a plurality of carbon dioxide supply ports provided in the injection well.
Collect underground water, seawater or brine from the sampling well of the pumping well provided in the underground aquifer where the underground water, seawater or flood water where the carbon dioxide is to be stored exists. The pressurized carbon dioxide supplied from the carbon dioxide supply port provided in the underground portion of the injection well is supplied to underground water, seawater or brine, and the pressurized carbon dioxide is underground. Mixed and dissolved in water, seawater or brine, split carbon dioxide from a plurality of carbon dioxide supply ports provided in the injection well, mixed and pressurized carbon dioxide and underground water, The volume ratio of seawater or brine (carbon dioxide / underground water, seawater or brine) is in a state of 0.2 or less, and carbon dioxide is mixed with underground water, seawater or brine in the form of bubbles with a diameter of 5 mm or less. Or installed in the injection well Pumped by a flow rate of more than the rising speed of the bubbles, the carbon dioxide and underground water, and mixed flow of sea water or brackish water carbon dioxide underground in lysis zone in the injection well, it is dissolved in sea water or brine.

It is effective to divide and supply carbon dioxide from a plurality of carbon dioxide supply ports provided in the injection well and to form a spiral flow using a static stirrer.
Collect underground water, seawater or brine from the sampling well of the pumping well provided in the underground aquifer where the underground water, seawater or flood water where the carbon dioxide is to be stored exists. The pressurized carbon dioxide supplied from the carbon dioxide supply port provided in the underground portion of the injection well is supplied to underground water, seawater or brine, and the pressurized carbon dioxide is underground. It can be mixed and dissolved in water, seawater or brine, splitting and supplying carbon dioxide from a plurality of carbon dioxide supply ports provided in the injection well, pressurized carbon dioxide and underground water, seawater Or the volume ratio (carbon dioxide / underground water, seawater or brine) is 0.2 or less, and carbon dioxide is mixed with underground water, seawater or brine in the form of bubbles having a diameter of 5 mm or less, Po installed in the injection well By using a static stirrer, the carbon dioxide is submerged in the dissolution zone in the injection well by using a static stirrer. Dissolve in water, seawater or brine.

It is effective to divide and supply carbon dioxide from a plurality of carbon dioxide supply ports provided in the injection well and to pass through a structure that reduces the cross-sectional area of the injection well.
Collect underground water, seawater or brine from the sampling well of the pumping well provided in the underground aquifer where the underground water, seawater or flood water where the carbon dioxide is to be stored exists. The pressurized carbon dioxide supplied from the carbon dioxide supply port provided in the underground portion of the injection well is supplied to underground water, seawater or brine, and the pressurized carbon dioxide is underground. It can be mixed and dissolved in water, seawater or brine, splitting and supplying carbon dioxide from a plurality of carbon dioxide supply ports provided in the injection well, pressurized carbon dioxide and underground water, seawater Or the volume ratio (carbon dioxide / underground water, seawater or brine) is in a state of 0.2 or less, and carbon dioxide is mixed with underground water, seawater or brine in the form of bubbles with a diameter of 5 mm or less, and injected on the ground or injected. Pong installed in the well This is a mixed phase flow of carbon dioxide and underground water, seawater, or brine, which has a flow rate higher than the rising speed of the bubbles, and passes through a structure that reduces the cross-sectional area of the injection well, allowing it to flow down and dissolve in the injection well. Carbon dioxide is dissolved in underground water, seawater or brine in the section.

  Carbon dioxide that has remained in an undissolved state and could not be flowed down as a mixed phase flow of carbon dioxide and underground water, seawater, or brine is trapped by the mesh in the water distribution pipe installed in the injection well and injected. Prevents the well from reaching the pressurized carbon dioxide supply port of the well.

  It is effective to use multiple pumping wells, and at least one of them is used as an observation well for monitoring the abundance of carbon dioxide contained in the groundwater, seawater or brine collected. is there.

By separately installing a carbon dioxide supply pipe and underground water, seawater or brine distribution pipes in the injection well, carbon dioxide and underground water, seawater or brine can be reliably transported.
The present invention will be described with reference to FIG.
Carbon dioxide generated from a distributed power generation system (not shown) is sent to the upper end of the injection well 1 through the separation and recovery device 10 and the pressurizing equipment 11, and the carbon dioxide supply port 3 provided in the injection well 1. From the sampling port 8 provided in the underground aquifer where the water pressure is 5 to 50 atmospheres where underground water, seawater, or brine in which carbon dioxide is to be stored is present. Groundwater, seawater or brine is sampled and installed in the underground part of the injection well for underground water, seawater or brine sent from the underground water, seawater or brine distribution pipe 13 in the injection well The pressurized carbon dioxide is supplied from a carbon dioxide supply port 4 of a distribution pipe of underground water, seawater, or brine, and the pressurized carbon dioxide and underground water, seawater, or brine are mixed. Carbon dioxide, underground water, seawater or Dissolved in water, from the outlet 5 at the lower end of the injection well provided in the underground aquifer where there is underground water, seawater or brine with a water pressure of 5 to 50 atmospheres, into underground water, seawater or brine The carbon dioxide is released as a dissolved mixture, and the carbon dioxide is stored.
The level of underground water, seawater, or flooded water sent by underground water, seawater, or flooded water distribution pipes 13 is determined according to the height of the installation location and the ease of operation when installed at the installation location. Consider the above. FIG. 3 shows a case of equipment provided in seawater without pumping to the ground.

FIG. 4 is a drawing of water from a water intake of a pumping well provided in a groundwater aquifer having a water pressure of 5 to 50 atmospheres where underground water, seawater, or flood water in which carbon dioxide is to be stored is present. After pumping up, the pressurized carbon dioxide supplied from the carbon dioxide supply port is supplied to the underground water, seawater or brine through the underground water, seawater or brine distribution pipes in the injection well. ing.
Carbon dioxide generated from a distributed power generation system (not shown) is sent to the upper end of the injection well 1 via the separation and recovery device 10 and the pressurizing equipment 11, and from the carbon dioxide supply port 3 provided in the injection well 1. , And supplied to the carbon dioxide supply pipe 9. The pressure applied to the carbon dioxide injected into the injection well 1 is a pressure calculated from a loss head necessary for supplying a supply amount for storing carbon dioxide in a place where carbon dioxide is to be stored.
On the other hand, underground water, seawater or flooded water from a sampling port 8 of a pumping well 6 provided in a groundwater aquifer having a water pressure of 5 to 50 atmospheres where underground water, seawater or flooded water in which carbon dioxide is to be stored exists. The water is pumped up to the ground, and then supplied to the underground portion of the injection well via the supply pipe 7 installed on the ground, through the underground water, seawater, or brine distribution pipe 13 in the injection well. The pressurized carbon dioxide supplied from the carbon dioxide supply port 4 of the distribution pipe of the underground water, seawater or brine is supplied to the underground water, seawater or brine and injected into the brine. The carbon dioxide is mixed with the generated carbon dioxide, and the carbon dioxide is dissolved in underground water, seawater or brine and injected into the underground aquifer where underground water, seawater or brine is present at a water pressure of 5 to 50 atmospheres. From the outlet 5 at the bottom of the well, to underground water, seawater or flooded water Released as a mixture prepared by dissolving carbon oxide, storing the carbon dioxide.

In any one of the above carbon dioxide storage methods, the discharge port 5 at the lower end of the injection well provided in the underground aquifer where the underground water, seawater or flood water having a water pressure of 5 to 50 atmospheres exists, and the underground It is necessary to set a certain distance for the well 8 of the pumping well provided in the groundwater aquifer having a water pressure of 5 to 50 atmospheres where carbon dioxide in which water, seawater or brine is present is stored. The underground water, seawater or brine collected from the sampling well 8 of the pumping well 6 and the underground water, seawater or brine mixture in which carbon dioxide released from the outlet 5 at the lower end of the injection well is dissolved are not combined. It is consideration to make it. If this distance is increased, there will be no problem, but the necessity for underground water, seawater or dredged water sampled from the sampling port 8 of the pumping well 6 results in increased power costs. As a result of discharging carbon dioxide-dissolved water to a tank simulating Examples 1 and 2 and an aquifer described later and sampling water in a simulated aquifer around the discharge point, the aquifer stored horizontally from the discharge port It is determined from the result that it is effective to be installed at a distance of 5 times or more the thickness of the layer.
In consideration of changing according to the installation location, the numerical value may change.

When supplying pressurized carbon dioxide supplied from a carbon dioxide supply port to underground water, seawater or brine, and mixing the pressurized carbon dioxide with underground water, seawater or brine, In order to increase the dissolution amount of carbon and increase the dissolution rate, the following conditions are employed.
Collect underground water, seawater or brine from the sampling well provided in the underground aquifer where the underground water, seawater or inundation where carbon dioxide is to be stored exists. The pressurized carbon dioxide supplied from the carbon dioxide supply port 4 of the underground water, seawater, or brine distribution pipe provided in the underground portion of the injection well is converted into underground water, seawater, or brine. The volume ratio of the pressurized carbon dioxide to the underground water, seawater or brine (carbon dioxide is mixed with and dissolved in the groundwater, seawater or brine). / Underground water, seawater or flooded water) is 0.2 or less, carbon dioxide is bubbled with a diameter of 5 mm or less and mixed with underground water, seawater or brine, and bubbles are generated by a pump installed on the ground or in the injection well The flow rate is higher than the rising speed of , Carbon dioxide and underground water, and mixed flow of sea water or brine, the in injection well by a stream of water carbon dioxide underground in dissolution zone 2 in injection well, is dissolved in sea water or brine.
The adjustment of the gas-liquid volume flow ratio (carbon dioxide / water) in the melting section of the injection well to a state of 0.2 or less was confirmed and determined by an example described later. Exceeding 0.2 is not appropriate as a result of the excessive presence of carbon dioxide. Further reduction of the gas-liquid volume flow ratio (carbon dioxide / water) from 0.2 is not preferable because it ultimately reduces the amount of carbon dioxide stored. The lower limit can be set to a value smaller than this value. In this case, the amount of carbon dioxide that can be stored also decreases.
Supplying carbon dioxide in the form of bubbles having a diameter of 5 mm or less is effective for mixing and dissolving. In order to make carbon dioxide into bubbles having a diameter of 5 mm or less, the carbon dioxide is supplied through a supply port of carbon dioxide having a small hole diameter.
For example, in the preconditions of FIGS. 3 and 4, carbon dioxide needs to have a volumetric flow rate of 20% or less of the volumetric flow rate of underground water, seawater or brine. The volumetric flow rate of underground water, seawater or brine is determined by the amount and depth of carbon dioxide stored, and is 289 l / min under the conditions of FIG. Therefore, the volume flow rate of carbon dioxide needs to be 58 l / min.
Regarding the flow rate of the multiphase flow, the rising speed of the bubbles having a diameter of 5 mm or less is 0.4 m / s at the maximum from the document of Non-Patent Document 3, so that the bubbles can flow down at a flow rate higher than that. In consideration of the volume flow of the above-mentioned underground water, seawater or brine, and carbon dioxide, if a pump that can press-fit only the volume flow described above is used for a press-fit well having a diameter of 12 cm or less, the required flow rate can be obtained. .

When performing the above treatment, carbon dioxide is dissolved in underground water, seawater or brine in the melt zone in the injection well as a spiral flow by using a mixed phase flow of carbon dioxide and underground water, seawater or brine and using a static stirrer. It is done.
Underground water, seawater or dredged water is collected from the water intake 8 of the pumping well provided in the underground aquifer where the underground water, seawater or flood water in which carbon dioxide is to be stored exists. The pressurized carbon dioxide supplied from the carbon dioxide supply port 4 of the underground water, seawater or brine water distribution pipe provided in the underground part of the injection well is put into the underground water, seawater or brine. Supplying and mixing and dissolving the pressurized carbon dioxide into underground water, seawater or brine, the volume ratio of pressurized carbon dioxide to underground water, seawater or brine (carbon dioxide / groundwater) , Seawater or brine) is in a state of 0.2 or less, carbon dioxide is bubbled with a diameter of 5 mm or less and mixed with underground water, seawater or brine, and above the rising speed of the bubbles by a pump installed on the ground or injection well Is the flow rate of dioxide Iodine and underground water, and mixed flow of sea water or brine, by using a static stirrer to dissolve the carbon dioxide in the dissolution section 2 in injection well as spiral flow of water underground, the sea water or brine.

Dissolve carbon dioxide in underground water, seawater, or brine in the melting section of the injection well by passing it through a structure that reduces the cross-sectional area of the injection well, using a mixed phase flow of carbon dioxide and underground water, seawater, or brine. It is also effective to make it.
Collect underground water, seawater or brine from the sampling well provided in the underground aquifer where the underground water, seawater or inundation where carbon dioxide is to be stored exists. The pressurized carbon dioxide supplied from the carbon dioxide supply port of the underground water, seawater or brine water pipe installed in the underground part of the injection well is supplied to the underground water, seawater or brine. , Mixing and dissolving the pressurized carbon dioxide in underground water, seawater or brine is a volume ratio of pressurized carbon dioxide to underground water, seawater or brine (carbon dioxide / underground water, seawater Or water) is 0.2 or less, carbon dioxide is bubbled with a diameter of 5 mm or less and mixed with underground water, seawater or brine, and the flow rate is higher than the rising speed of the bubbles by a pump installed on the ground or injection well. Is carbon dioxide Water underground, a multiphase flow of sea water or brine, is passed through a structure in which reducing the cross-sectional area of the injection well.
The structure in which the cross-sectional area of the pipe is reduced refers to a pipe orifice, a nozzle, and a venturi pipe.

It is effective to divide and supply carbon dioxide from a plurality of carbon dioxide supply ports provided in the injection well.
Collect underground water, seawater or brine from the sampling well of the pumping well provided in the underground aquifer where the underground water, seawater or flood water where the carbon dioxide is to be stored exists. The pressurized carbon dioxide supplied from the carbon dioxide supply port provided in the underground portion of the injection well is supplied to underground water, seawater or brine, and the pressurized carbon dioxide is underground. It is possible to mix and dissolve in water, seawater or brine, and supply and mix carbon dioxide separately from the multiple carbon dioxide supply ports of underground water, seawater or brine water pipes installed in the injection well. The volume ratio of pressurized carbon dioxide to underground water, seawater or brine (carbon dioxide / underground water, seawater or brine) is 0.2 or less, and carbon dioxide is bubbled with a diameter of 5 mm or less underground. Mixed with water, seawater or brine , A mixed phase flow of carbon dioxide and underground water, seawater or brine with a flow rate higher than the rising speed of bubbles by a pump installed on the ground or in the injection well, and carbon dioxide in the dissolution zone 2 in the injection well, Dissolve in seawater or brine.

It is effective to divide and supply carbon dioxide from a plurality of carbon dioxide supply ports provided in the injection well and to form a spiral flow using a static stirrer.
Collect underground water, seawater or brine from the sampling well of the pumping well provided in the underground aquifer where the underground water, seawater or flood water where the carbon dioxide is to be stored exists. The pressurized carbon dioxide supplied from the carbon dioxide supply port provided in the underground portion of the injection well is supplied to underground water, seawater or brine, and the pressurized carbon dioxide is underground. Mixing and dissolving in the water, seawater or brine, separates and supplies carbon dioxide from the multiple carbon dioxide supply ports of the underground water, seawater or brine distribution pipes provided in the injection well. The volume ratio of compressed carbon dioxide to underground water, seawater or brine (carbon dioxide / underground water, seawater or brine) is 0.2 or less, and carbon dioxide is bubbled with a diameter of 5 mm or less Mixed with water, seawater or brine, A mixed phase flow of carbon dioxide and underground water, seawater, or brine with a flow rate higher than the rising speed of bubbles by a pump installed above or in the injection well, and using a static stirrer, it flows down as a spiral flow in the injection well The carbon dioxide is dissolved in underground water, seawater or brine in the dissolution zone 2.

It is effective to divide and supply carbon dioxide from a plurality of carbon dioxide supply ports provided in the injection well and to pass through a structure that reduces the cross-sectional area of the injection well.
Collect underground water, seawater or brine from the sampling well of the pumping well provided in the underground aquifer where the underground water, seawater or flood water where the carbon dioxide is to be stored exists. The pressurized carbon dioxide supplied from the carbon dioxide supply port 4 of the underground water, seawater or brine water distribution pipe provided in the underground part of the injection well is put into the underground water, seawater or brine. Supplying, mixing and dissolving the pressurized carbon dioxide in underground water, seawater or brine, dividing and supplying carbon dioxide from a plurality of carbon dioxide supply ports provided in the injection well, The volume ratio of pressurized carbon dioxide to underground water, seawater or brine (carbon dioxide / underground water, seawater or brine) is 0.2 or less, and carbon dioxide is bubbled with a diameter of 5 mm or less Mixed with water, seawater or brine, A mixed-phase flow of carbon dioxide and underground water, seawater, or brine with a flow rate higher than the rising speed of bubbles by a pump installed above or in the injection well and passing through a structure that reduces the cross-sectional area of the injection well Thus, carbon dioxide is dissolved in underground water, seawater or brine in the dissolution zone in the injection well.
The adjustment of the gas-liquid volume flow ratio (carbon dioxide / water) in the melting section of the injection well to a state of 0.2 or less was confirmed and determined by an example described later. Exceeding 0.2 is not appropriate as a result of the excessive presence of carbon dioxide. Further reduction of the gas-liquid volume flow ratio (carbon dioxide / water) from 0.2 is not preferable because it ultimately reduces the amount of carbon dioxide stored. The lower limit can be set to a value smaller than this value. In this case, the amount of carbon dioxide that can be stored also decreases.
Supplying carbon dioxide in the form of bubbles having a diameter of 5 mm or less is effective for mixing and dissolving. In order to make carbon dioxide into bubbles having a diameter of 5 mm or less, the carbon dioxide is supplied through a supply port of carbon dioxide having a small hole diameter.

When performing the above treatment, carbon dioxide is dissolved in underground water, seawater or brine in the melt zone in the injection well as a spiral flow by using a mixed phase flow of carbon dioxide and underground water, seawater or brine and using a static stirrer. It is done.
Collect underground water, seawater or brine from the sampling well of the pumping well provided in the underground aquifer where the underground water, seawater or flood water where the carbon dioxide is to be stored exists. The pressurized carbon dioxide supplied from the carbon dioxide supply port 4 of the underground water, seawater or brine water distribution pipe provided in the underground part of the injection well is used for the underground water, seawater or brine. And supplying the pressurized carbon dioxide to underground water, seawater or brine to dissolve and supply a plurality of carbon dioxide in the underground water, seawater or brine distribution pipes provided in the injection well Carbon dioxide is divided and supplied from the mouth, and the volume ratio of pressurized carbon dioxide to underground water, seawater or brine (carbon dioxide / groundwater, seawater or brine) is 0.2 or less, Carbon dioxide as bubbles with a diameter of 5 mm or less Mix with lower water, seawater or brine, and use a static stirrer to make a mixed phase flow of carbon dioxide and underground water, seawater or brine with a flow rate higher than the rising speed of bubbles by a pump installed on the ground or injection well Thus, carbon dioxide is dissolved in underground water, seawater or brine in the dissolution zone 2 in the injection well as a spiral flow.

Dissolve carbon dioxide in underground water, seawater, or brine in the melting section of the injection well by passing it through a structure that reduces the cross-sectional area of the injection well, using a mixed phase flow of carbon dioxide and underground water, seawater, or brine. It is also effective to make it.
Collect underground water, seawater or brine from the sampling well of the pumping well provided in the underground aquifer where the underground water, seawater or flood water where the carbon dioxide is to be stored exists. The pressurized carbon dioxide supplied from the carbon dioxide supply port 4 of the underground water, seawater or brine water distribution pipe provided in the underground part of the injection well is used for the underground water, seawater or brine. And supplying the pressurized carbon dioxide to underground water, seawater or brine to dissolve and supply a plurality of carbon dioxide in the underground water, seawater or brine distribution pipes provided in the injection well Carbon dioxide is divided and supplied from the mouth, and the volume ratio of pressurized carbon dioxide to underground water, seawater or brine (carbon dioxide / groundwater, seawater or brine) is 0.2 or less, Carbon dioxide as bubbles with a diameter of 5 mm or less Cross section of the injection well as a mixed phase flow of carbon dioxide and underground water, seawater or brine, which is mixed with the lower water, seawater or brine and flowed above the rising speed of the bubbles by a pump installed on the ground or injection well. Is passed through a structure to reduce
The structure in which the cross-sectional area of the pipe is reduced refers to a pipe orifice, a nozzle, and a venturi pipe.

  Carbon dioxide that has remained in an undissolved state and could not be flowed down as a mixed phase flow of carbon dioxide and underground water, seawater, or brine is trapped by the mesh in the water distribution pipe installed in the injection well and injected. Prevents the well from reaching the pressurized carbon dioxide supply port of the well.

  A plurality of the above-mentioned pumping wells are provided, and at least one of the pumping wells is effective to be used as an observation well for monitoring the abundance of carbon dioxide contained in the groundwater, seawater or brine collected. It is.

  The points that are not sufficient in the above description will be described below.

The carbon dioxide to be stored 6 is pressurized with a pressurizing device installed on the ground, and the pressurized carbon dioxide is supplied from the carbon dioxide supply port at the top of the injection well, while trying to store the carbon dioxide. The underground water, seawater or brine is sampled from the water intake of the pumping well provided in the underground aquifer where the underground water, seawater or inundated water exists. Supply underground water, seawater or brine from the underground water, seawater or brine supply port provided in the part, mix with the pressurized carbon dioxide, and convert the carbon dioxide into underground water, seawater or brine Dissolve carbon dioxide into the underground water, seawater or brine from the outlet at the lower end of the injection well provided in the underground aquifer where underground water, seawater or brine is present at a water pressure of 5 to 50 atmospheres. Release as a dissolved mixture to store carbon dioxide. To.
As a result, at the underground water, seawater, or brine supply port located in the middle of the injection well, the differential pressure can be made lower than in the conventional case, reducing the energy loss due to pressure reduction due to control valves, etc. And part of the required energy can be suppressed. The basis for this is as follows.
For the energy required to dissolve carbon dioxide in underground water, seawater or brine, and to store it by injecting it into the ground, the operation to dissolve carbon dioxide in water, seawater or brine is performed on the ground and in the ground. Compare the case of storage.
Table 1 shows the preconditions for numerical calculation and the breakdown of the calculated required energy. In the calculation, a 1000 kW distributed power generation system (efficiency 40%) is assumed as a carbon dioxide emission source. Further, it was assumed that the pressurization of carbon dioxide was an isothermal compression (15 ° C.) with an 80% efficiency compressor.
Furthermore, the saturation rate of dissolved carbon dioxide is 80%, the number of divisions of the carbon dioxide supply port is 3, and the section necessary for dissolving carbon dioxide in underground water, seawater or brine when stored in the ground Is assumed to be 10 m. The underground pressure is calculated from the hydrostatic pressure equilibrium. The supply amount of carbon dioxide was calculated from Equation 2 described later.
What is common to both the case of dissolving on the ground and the case of dissolving on the ground is that the ratio of energy required for pressurization of carbon dioxide is the largest.
Regarding the energy for injecting carbon dioxide and water into the ground, it was confirmed that the required energy can be reduced to about half when dissolved in the ground compared to the method of dissolving on the ground. The amount of energy required for sampling and injection of water by the method of dissolving in the ground was on the order of negligible. As a result, it was estimated that by creating carbon dioxide-dissolved water in the ground, the energy required for injecting carbon dioxide-dissolved water can be reduced to about 84% of the method of creating on the ground.

FIG. 5 shows the energy required for injecting carbon dioxide by dissolving it in water, the case where the operation for dissolving carbon dioxide in water is performed on the ground and the case where the operation for dissolving in the ground is performed. This is the case where compression energy is included.
FIG. 6 shows the energy required for injecting carbon dioxide dissolved in water, the case where the operation for dissolving carbon dioxide in water is performed on the ground and the case where the operation for dissolving in the ground is performed. This is the case where compression energy is not included.
The method of the present invention can significantly reduce the injection energy especially in carbon dioxide storage.

The reason why the volume ratio of pressurized carbon dioxide to underground water, seawater or brine (carbon dioxide / groundwater, seawater or brine) is 0.2 or less is as follows.
The underground water, seawater, or brine collected and pumped from the sampling well 8 of the pumping well is supplied from the supply port 4, and the carbon dioxide sent under pressure from the supply port 4 of the injection well 1 is supplied to the injection well. While passing through the mixing section 2 provided between the inlet 4 and the inlet 3, the pressurized carbon dioxide is mixed into underground water, seawater or brine collected from the underground, Pressurized carbon dioxide is dissolved in underground water, seawater or brine.

When carbon dioxide is dissolved in underground water, seawater or brine, the rate of increase in carbon dioxide concentration can be measured.
The increasing rate of the carbon dioxide concentration is based on the formula shown by the following formula (1).



In the formula, F _w (Kg / m ³ / s) is an increase rate of the carbon dioxide concentration of water due to dissolution.
k is a coefficient called an exchange rate (m / s). Specifically, it is defined by the strength of the liquid phase disturbance. S (Kg / m ³ / atm) and ΔfCO ₂ (atm) represent the difference between the carbon dioxide solubility in the liquid phase, the pressure of carbon dioxide gas, and the carbon dioxide partial pressure of water, respectively.
A / V represents the total surface area (m ² / m ³ ) of the gas-liquid interface per unit volume.
Rw is the volume ratio of water per unit volume (m ³ / m ³ ).

F _w (Kg / m ³ / s) is an increase rate of carbon dioxide concentration in water due to dissolution of carbon dioxide in water.
In the equation, k is a coefficient called exchange rate (m / s). Specifically, it is a constant defined by the strength of the turbulence of the liquid phase.
S (Kg / m ³ / atm) and ΔfCO ₂ (atm) represent the difference between the carbon dioxide solubility in the liquid phase, the pressure of carbon dioxide gas, and the carbon dioxide partial pressure of water, respectively.
A / V represents the total surface area (m ² / m ³ ) of the gas-liquid interface per unit volume for carbon dioxide bubbles.
Rw is the volume ratio (m ³ / m ³ ) of water per unit volume required by carbon dioxide.
Among these parameters, the parameters other than k and A / V are determined by the injection rate of carbon dioxide into the ground and the ground conditions. Therefore, in order to directly increase the dissolution rate of carbon dioxide, k and It can be said that it is effective to increase A / V.
k is a constant defined by the strength of the turbulence of the liquid phase. It is a constant that can be determined from the flow results from experiments.
A / V is a value determined according to carbon dioxide bubbles generated when carbon dioxide is actually dissolved.
In order to increase the value of A / V, specifically, to increase the gas-liquid interface per unit volume, it is known as a general method to make carbon dioxide into fine bubbles (for example, Patent Document 3 (Japanese Patent Laid-Open No. 2008-6367).

  In the case of the present invention, when a bubble of carbon dioxide supplied from the ground and water, seawater, or brine are mixed, a specific means that can increase A / V is actually measured. Preferred conditions can be determined, and it was determined by confirming the embodiment that the gas-liquid volume flow rate ratio (carbon dioxide / water) in the melting section of the injection well is adjusted to 0.2 or less. Exceed 0.2, as a result of carbon dioxide are present in excess, not appropriate. Further reduction of the gas-liquid volume flow ratio (carbon dioxide / water) from 0.2 is not preferable because it ultimately reduces the amount of carbon dioxide stored. In this sense, the lower limit can be set to a small value. Results also decreases the amount that can store carbon dioxide in this case, it comes to not practical.

In the method of the present invention, when carbon dioxide is supplied as fine bubbles, bubbles are formed using bubble generating means. Specifically, pressurized carbon dioxide is passed through the fine porous body to generate bubbles, and then supplied into the injection well. The bubble diameter is determined by the shape of the microporous material.
If 5 mm bubbles are to be obtained, a microporous material having a diameter of 5 mm is used. The diameter need not be 5 mm, and a diameter of 5 mm or less can be used.

Under pressure, carbon dioxide is supplied into the injection well from the supply port of the injection well. Between the pressurized carbon dioxide supply port 3 of the injection well 1 and the discharge port 5 at the lower end of the injection well, underground water is supplied. , Underground water, seawater or brine collected from a water intake of a pumping well provided in a groundwater aquifer with a water pressure of 5 to 50 atmospheres where carbon dioxide in which seawater or brine is present is stored, A supply port 5 for supplying underground water, seawater or brine is provided.
Between the underground water, seawater or brine supply port 4 of the injection well and the discharge port 5 at the lower end of the injection well, underground water and seawater supplied from the underground water, seawater or brine supply port 4 of the injection well Or the mixed water dissolution part which mixes underground water, seawater, or brine, and carbon dioxide, and dissolves carbon dioxide in underground water, seawater, or brine. 2 is mixed and dissolved.
When carbon dioxide is mixed and dissolved, it contains carbon dioxide bubbles and is mixed in a state where it flows down in the injection well as a mixed phase flow of carbon dioxide and underground water, seawater, or brine with a flow rate higher than the rising speed of the bubbles. Dissolved. The flow rate of the multiphase flow is increased to the rising speed of the bubbles of carbon dioxide by adjusting the flow rate of underground water, seawater, or brine with a pump installed on the ground or in the injection well. The bubble rising speed was calculated from a calculated value (Non-patent Document 3) using the bubble diameter as a parameter.

From the results of Example 1 described later, bubbles are not formed as a sufficient amount when the volumetric flow rate of carbon dioxide exceeds 20% (0.2) with respect to the volumetric flow rate of underground water, seawater, or brine. Was confirmed.
Therefore, it is necessary to make the injection condition that the gas-liquid volume flow ratio (carbon dioxide / water) is 0.2 or less. However, as the dissolution of carbon dioxide proceeds, the gas-liquid volume ratio decreases, so even if the amount of underground water, seawater, or brine used is small relative to the amount of carbon dioxide to be injected, it is supplied into the injection well. It is effective to set the gas-liquid volume flow rate ratio to 0.2 or less by installing a plurality of carbon dioxide supply ports to perform, dividing the pressurized carbon dioxide and mixing it with underground water, seawater, or brine. If the flow is maintained so as to maintain this state, mixing and dissolution of carbon dioxide become possible.
Since the volume of gaseous carbon dioxide is inversely proportional to pressure, the mass of carbon dioxide is relatively large as the carbon dioxide is supplied to a deep carbon dioxide supply port. For example, when the pressurized carbon dioxide is divided into three places with depths of 170 m, 180 m, and 190 m, the mass ratio of the divided carbon dioxide is 17:18:19, respectively. However, it is assumed that the pressure in the injection well is determined by the hydrostatic pressure.
In order to effectively carry out the above mixing method, the internal structure of the injection well is designed to inject one or more pressurized carbon dioxide in the vicinity of the pumped underground water, seawater and brine injection pipes. It is efficient to arrange the pipes concentrically.

Considering the cost for practical carbon dioxide storage and the period for performing injection, the carbon dioxide supply pressure is about the same as the pressure at the mixing point and is in the range of several to 50 atmospheres, and the supply amount is 10 ³ to 10 ^5. The order is t / year (≈0.1 to 100 t / hour).
For underground water, seawater, or flooded water, pressurization by hydrostatic pressure works, so the supply pressure on the ground need only be the amount of head loss. The supply amount varies depending on the depth of the injection point, and requires 20 to 130 times the mass of carbon dioxide (according to the inventors' patent application 2008-296580).
When carbon dioxide is supplied, it is necessary to supply it at a constant rate, and it is necessary to inject it in divided portions.
When carbon dioxide is divided and injected, it is necessary to change the supply pressure and supply amount of carbon dioxide for each mixing point. The inventor has clarified that an appropriate supply amount of carbon dioxide at a mixing point at a certain depth is expressed by the following equation.

W, w _n respectively represent the sum of the carbon dioxide supply mass, a feed mass in the mixing point there n. _pn is the supply pressure at a certain mixing point n, which is comparable to the water pressure at that point. N indicates the number of mixing points and is determined by the supply amount of carbon dioxide and water. In addition, in the range of the supply amount of carbon dioxide in the present invention from the experimental results, the supply port of underground water, seawater, or brine provided in the injection well is 6, at a depth of 50-100 m, 5, at 100-200 m, It has become clear that 200-350 m requires 4 and 350-500 m requires 3 and the interval between the supply ports is 10 m when the bubble diameter of carbon dioxide is 1 mm and 20 m when the bubble diameter is 5 mm or less.

  After the pressurized carbon dioxide is supplied from the pressurized carbon dioxide supply port provided in the injection well, the underground water is supplied from the underground water, seawater or brine supply port provided in the injection well. , Underground water, seawater or flooded water collected from the water intake of the pumping well provided in the underground aquifer with a water pressure of 5 to 50 atm to store carbon dioxide in which seawater or brine exists Supplying from the supply port of underground water, seawater or brine supplied to the injection well via the water, seawater or brine distribution pipe, mixing with the pressurized carbon dioxide is the pressurized After carbon dioxide is supplied from the pressurized carbon dioxide supply port provided in the injection well, underground water, seawater or brine is supplied from the ground water, seawater or brine supply port provided in the injection well. Water trying to store existing carbon dioxide Underground water, seawater, or brine collected from the well outlet of a pumping well provided in a 5-50 atm underground aquifer is installed in the injection well through underground water, seawater, or brine distribution pipes. its dependent water underground, be supplied by dividing a plurality of supply ports of seawater or brackish effective.

In this experimental result, it is observed that even when the flow velocity of the mixed phase flow of water and carbon dioxide is larger than the rising speed of the bubbles of carbon dioxide, the bubbles cannot flow down. This is considered to be due to the partial decrease in the flow velocity of the multiphase flow in the pipe wall portion of the injection well pipe. As a countermeasure, it was found that the flow velocity of the multiphase flow can be prevented by supplying a mixed phase flow of pressurized carbon dioxide bubbles and underground water, seawater or brine from the tangential direction to the static stirrer.
This was confirmed by the experiment described later.
Underground water, seawater, or flood water flows along the pipe wall and gradually flows down to form a mixed phase of carbon dioxide and a spiral state. At this time, since the bubbles are concentrated at the center of the pipeline where the flow velocity of the multiphase flow is relatively large, the bubbles can be prevented from rising. In addition, it was confirmed that the bubbles of carbon dioxide were narrowed in the spiral flow, and the dissolution rate in underground water, seawater or brine was increased.

In addition, as shown in FIG. 7, the mixed phase flow of carbon dioxide and underground water, seawater or brine containing bubbles of carbon dioxide and having a flow velocity higher than the rising speed of the bubbles is the pipe of the mixing part of the injection well. The flow velocity can be increased by passing through a structure whose cross-sectional area is reduced.
The structure in which the cross-sectional area of the pipe is reduced refers to a pipe orifice, a nozzle, and a venturi pipe. A multiphase flow consisting of carbon dioxide and underground water, seawater, or flooded water that has passed through a venturi tube, etc. can collect bubbles rising near the pipeline wall surface in the middle of the pipeline in a section with a reduced cross-sectional area. . Since the flow velocity increases in the section where the cross-sectional area is reduced, the aggregated bubbles can be efficiently flowed down. This state is shown in FIG.

  From the above results, the decrease in the flow velocity of the multiphase flow due to the friction near the wall surface of the pipe and the increase in the bubbles of carbon dioxide caused by this are as follows: (1) forming a spiral flow in the injection well and (2) It was confirmed that the use of a Venturi tube is most effective in reducing the cross-sectional area. In the above case, there is an effect of increasing the flow turbulence, and an effect of increasing the dissolution rate can be expected by increasing the exchange rate k.

As a method other than the above, an attempt was made to install a mesh-like obstacle serving as a filter against bubbles in the pipeline.
Specifically, in the carbon dioxide storage method described so far, the carbon dioxide that has remained in an undissolved state and could not be flowed down by the mixed phase flow of carbon dioxide and underground water, seawater, or brine. By trapping the carbon with a mesh in a water distribution pipe provided between the pressurized carbon dioxide supply port of the injection well and the underground water, seawater or brine supply port provided in the injection well, the injection well The carbon dioxide remaining in an undissolved state can be treated by dissolving before rising to the pressurized carbon dioxide supply port.

Regarding groundwater sampling, the thickness of the aquifer that stores the injection well and the pumping well in the horizontal direction in order to prevent the injected carbon dioxide dissolved water from being collected again. It is necessary to separate 5 times or more.
For this purpose, as shown in FIG. 1, it is effective to install a pumping well having a similar depth at a point away from the injection well. In actual carbon dioxide injection, such a pumping well can be used as an observation well for regular monitoring of water flow and water quality around the injection site. Note that at least two observation wells are required for monitoring the spatial distribution.

  In the case of the present invention, the underground water collected from the underground at the same depth as the injection point of the underground water, seawater or brine that dissolves carbon dioxide provided at the tip of the injection well, seawater Alternatively, two or more pumping wells that are installed at a specific distance from the injection point of the injection well are created, and underground water, seawater, or submerged water sampled by at least one of the pumping wells. it is effective in combination as observation well for monitoring the abundance of carbon dioxide contained in the.

  The contents of the present invention will be specifically described below with reference to examples. The present invention is not limited to this.

Using an experimental device simulating an actual carbon dioxide dissolution system, we measured the formation of bubbles by gas-liquid volume ratio and evaluated the effect on the dissolution rate of carbon dioxide.
FIG. 8 is a schematic diagram of an experimental apparatus for collecting data when carrying out the present invention.
The shape of the simulated injection well 44 is a tube having a diameter of 10 cm and a length of 10 m.
The simulated injection well 44 is provided with one water supply pipe 41 at the upper end and two pressurized carbon dioxide supply pipes 42 at a position 5 m from the upper end and the upper end.
Carbon dioxide gas and water are pumped and mixed by the mixed phase flow adjusting pump 43, and then carbon dioxide is dissolved in water. Gas-liquid (carbon dioxide and water) is separated in the gas-liquid separation / separation tank 46, carbon dioxide gas is discharged from the gas outlet 47, and water is led to the carbon dioxide concentration measuring device (410) through the control valve 48 for analysis. To do. Water is returned through the circulation line 45. Further, it can be discharged from the discharge port 49.
The average flow velocity in the simulated injection well was maintained at 1.5 m / s with respect to the direction indicated by the arrow in FIG. In addition, the value of the flow rate is a mixed phase in the dissolution zone where the pressurized carbon dioxide in the injection well is dissolved in water when the present invention is applied to a distributed power generation system (carbon dioxide emission is about several thousand tons / year). It is a reproduction of the flow velocity. During the experiment, the inside of the high-pressure pipe is always filled with tap water having a temperature and a pressure of 25 ° C. and 20 atmospheres, respectively.
The experiment was performed by changing the flow rate of carbon dioxide to 140 l / min, 210 l / min, and 280 l / min. These values were determined so that the gas-liquid volume flow ratio in the simulated injection well was about 0.20, 0.30, and 0.40. Carbon dioxide is injected into the simulated injection well as bubbles having a bubble diameter of about 0.5 mm, 1 mm, and 5 mm by passing through a porous body with different pore diameters installed at the end of injection. The bubble rising speed calculated from literature values from these bubble diameters is 0.4 m / s at the maximum, and in the calculation, the bubbles of carbon dioxide are set to flow down in a multiphase flow under all conditions.
The dissolution rate of carbon dioxide was calculated by sampling the carbon dioxide-dissolved water generated in the simulated injection well after gas-liquid separation in the lower gas-liquid separation tank and measuring the carbon dioxide concentration with a carbon dioxide concentration measuring device. . Note that the water decrease due to sampling is supplied from the water injection pipe 41.
From the measurement results, when the flow rate was 140 l / min, the dissolution rate of carbon dioxide was about 79, 34, and 13% with bubble diameters of 0.5, 1.0, and 5.0 mm, respectively. On the other hand, at flow rates of 210 l / min and 280 l / min, the dissolution rates were relatively low values of about 51, 20, and 9%, 42, 22, and 2%, respectively. The dissolution rate calculated from the undissolved carbon dioxide recovered from the upper and lower ends of the simulated injection well also agreed with the above measurement results within the error range.
When the flow rate is 210 l / min and 280 l / min, formation of irregularly shaped bubbles of several to several tens of centimeters in addition to bubbles is visually observed in the dissolution zone. From this, when the flow rate of carbon dioxide relative to water is large, bubbles are not maintained and larger bubbles are formed, and the aforementioned parameter A / V is reduced, so that the dissolution rate of carbon dioxide is reduced. It is thought that it decreased.
Therefore, in this plan, it was found that the gas-liquid volume flow ratio (carbon dioxide / water) in the dissolution zone must be 0.2 or less. However, in the dissolution zone, the volume of gas decreases with the dissolution of carbon dioxide, so by dividing the carbon dioxide and mixing it with underground water, seawater and brine, Thus, even when the amount of carbon dioxide is large, it is considered that the gas-liquid volume ratio in the dissolution zone can be reduced to the above value or less.
Further, in the experiment, even when the above gas method set was not confirmed at a gas-liquid volume ratio of 0.2 or less, an increase in bubbles having the same diameter was confirmed when the bubble diameter was 1 mm and 5 mm. This is considered to be caused by the fact that the flow velocity of the multiphase flow near the wall surface is lower than the bubble rising speed due to the friction of the pipe wall surface. A countermeasure against the rise of the relatively small bubbles will be described in Example 2 below.

In order to prevent bubbles from rising due to friction on the pipe wall surface in Example 1, the structure inside the pipe was changed and its influence was evaluated.
In the experiment, as in Example 1, in addition to the case where nothing is installed inside the simulated injection well (Case 1), the case where a static stirrer is installed inside and the flow is stirred (Case 2), and the pipe The experiment was conducted with respect to the case (case 3) in which a ventura tubular portion was provided every 1 m.
Carbon dioxide was injected into the simulated injection well at 70 l / min from the gas injection tube in order to prevent air bubbles from gathering as seen in Example 1. This flow rate is set so that the gas-liquid volume flow rate ratio (carbon dioxide / water) in the simulated injection well is 0.1.
In case 1, as in Example 1, when the bubble diameter was 1 mm and 5 mm, it was visually observed that some of the bubbles were rising. On the other hand, in Cases 2 and 3, no bubble rise was confirmed.
The dissolution rate of carbon dioxide at this time is 85, 33, 15% (case 1), 95, 88, 56% (case 2), 87, 86, under the conditions of a bubble diameter of 0.5 mm, 1 mm, and 5 mm, respectively. 46% (Case 3). Further, the exchange speed k obtained from this experiment is 0.39 × 10 ⁻⁴ m / s (case 1), 1.65 × 10 ⁻⁴ m / s (case 2), 1.13 × 10 ^−4. m / s (Case 3).
From the above results, it is shown that the static stirrer and the venturi tube are effective in preventing bubbles from rising.
In addition, from the calculated exchange speed k, when a gas-liquid flow volume ratio is 0.2 or less and a static stirrer or a venturi tube is installed inside the injection well, a dissolution zone within 10 m with a bubble diameter of carbon dioxide of about 1 mm It was confirmed that about 80% of the carbon dioxide injected in the dissolution zone with a bubble diameter of 5 mm or less and within 20 m can be dissolved. However, when underground water, seawater or brine is actually used, the above values may change due to the influence of the respective viscosity and surface tension.
The following figure summarizes the measurement results obtained in Example 2. However, the distance required to dissolve 80% carbon dioxide in FIG. 4 was calculated from the exchange rate k obtained from the experiment and the amount of air bubbles detected at the gas outlet 47.

It is a figure which shows the content of this invention. It is a figure which shows the content of this invention. It is a figure which shows the content of this invention. It is a figure which shows the content of this invention. It shows a comparison of calculation results of the required energy of carbon dioxide dissolution method that has been made from the present invention and the conventional. It shows a comparison of calculation results of the required energy of carbon dioxide dissolution method that has been made from the present invention and the conventional. It is a diagram showing the structure of injection well in order to flow down the bubbles of carbon dioxide. 1 is a conceptual diagram of an experimental apparatus used in Example 1. FIG.

1: Injection well 2: Dissolution zone in the injection well 3: Carbon dioxide supply port provided in the injection well 4: Carbon dioxide supply port 5: Groundwater aquifer with underground water, seawater or brine and carbon dioxide mixture 6: Pumping well 7: Supply channel for supplying pumped water to the injection well 8: Sampling port for underground water, seawater or brine in the underground aquifer 9: Supply pipe for carbon dioxide 10: Dioxide Carbon separation and recovery equipment 11: Carbon dioxide pressurization equipment 12: Underground aquifer 13: Distribution pipe for underground water, seawater or brine 31: Multiphase flow of underground water, seawater or brine and carbon dioxide 32: Movement of bubbles Path 33: Structure for reducing the cross-sectional area of the injection well 41: Water supply pipe 42: Pressurized carbon dioxide supply pipe 43: Multiphase flow velocity adjustment pump 44: Simulated injection well 45: Circulation pipe 46: Gas-liquid separation layer 47: Undissolved carbon dioxide gas emission 48: Control valve 49: drain port 410: carbon dioxide concentration measuring device

Claims (22)

  The carbon dioxide to be stored is pressurized with a pressurization device installed on the ground, and the pressurized carbon dioxide is supplied from the carbon dioxide supply port at the top of the injection well, while the underground where the carbon dioxide is to be stored Water, underground water, seawater or inundated water is collected from the pumping well outlet located in the underground aquifer of 5 to 50 atm. Supply pressurized carbon dioxide supplied from a carbon dioxide supply port provided to underground water, seawater or brine, and mix the pressurized carbon dioxide with underground water, seawater or brine, Dissolved, underground water, seawater in which carbon dioxide is dissolved from the outlet at the lower end of the injection well provided in the underground aquifer where there is underground water, seawater or brine with a water pressure of 5 to 50 atmospheres Or released as a mixture with brine and diacid Storage method of carbon dioxide, which comprises storing carbon.   The discharge port at the lower end of the injection well provided in the underground aquifer where the underground water, seawater or flood water of 5 to 50 atmospheres of water exists, and the carbon dioxide where the underground water, seawater or brine exists. The water intake of the pumping well provided in the underground aquifer having a water pressure of 5 to 50 atmospheres to be stored is separated from the discharge port by a distance of 5 times or more the thickness of the aquifer stored in the horizontal direction. The carbon dioxide storage method according to claim 1, wherein the carbon dioxide storage method is installed.   Collect underground water, seawater or brine from the sampling well of the pumping well provided in the underground aquifer where the underground water, seawater or flood water where the carbon dioxide is to be stored exists. The pressurized carbon dioxide supplied from the carbon dioxide supply port provided in the underground portion of the injection well is supplied to underground water, seawater or brine, and the pressurized carbon dioxide is underground. Pumping wells provided in underground aquifers of 5 to 50 atmospheres of water in which underground water, seawater or flood water in which carbon dioxide is to be stored are mixed and dissolved in water, seawater or brine After collecting water from the water sampling port and pumping up to the ground, the pressurized carbon dioxide supplied from the carbon dioxide supply port is supplied to the underground water, seawater or brine under brine, The pressurized carbon dioxide underground Water, carbon dioxide method of storage according to claim 1, wherein the dissolution in seawater or brine.   Collect underground water, seawater or brine from the sampling well of the pumping well provided in the underground aquifer where the underground water, seawater or flood water where the carbon dioxide is to be stored exists. The pressurized carbon dioxide supplied from the carbon dioxide supply port provided in the underground portion of the injection well is supplied to underground water, seawater or brine, and the pressurized carbon dioxide is underground. The volume ratio of pressurized carbon dioxide to underground water, seawater, or brine (carbon dioxide / groundwater, seawater, or brine) is 0.2 or less. Carbon dioxide and groundwater that are mixed with underground water, seawater, or brine in the form of bubbles with a diameter of 5 mm or less, and that have a flow rate higher than the rising speed of bubbles by a pump installed on the ground or an injection well. , Seawater or brine And multiphase flow, through the injection well by a stream of water carbon dioxide underground in lysis zone in the injection well, the carbon dioxide method of storage according to claim 1, wherein the dissolution in the seawater or brine.   Collect underground water, seawater or brine from the sampling well of the pumping well provided in the underground aquifer where the underground water, seawater or flood water where the carbon dioxide is to be stored exists. The pressurized carbon dioxide supplied from the carbon dioxide supply port provided in the underground portion of the injection well is supplied to underground water, seawater or brine, and the pressurized carbon dioxide is underground. The volume ratio of pressurized carbon dioxide to underground water, seawater, or brine (carbon dioxide / groundwater, seawater, or brine) is 0.2 or less. Yes, carbon dioxide in the form of bubbles with a diameter of 5 mm or less and mixed with underground water, seawater or brine, and carbon dioxide and underground water at a flow rate higher than the rising speed of the bubbles by a pump installed on the ground or injection well, Seawater or brine And phase flow, by using a static stirrer, carbon dioxide method of storage according to claim 1, wherein the dissolving of carbon dioxide in the dissolution zone in the injection well as spiral flow of water underground, the sea water or brine.   Collect underground water, seawater or brine from the sampling well of the pumping well provided in the underground aquifer where the underground water, seawater or flood water where the carbon dioxide is to be stored exists. The pressurized carbon dioxide supplied from the carbon dioxide supply port provided in the underground portion of the injection well is supplied to underground water, seawater or brine, and the pressurized carbon dioxide is underground. The volume ratio of pressurized carbon dioxide to underground water, seawater, or brine (carbon dioxide / groundwater, seawater, or brine) is 0.2 or less. Yes, carbon dioxide in the form of bubbles with a diameter of 5 mm or less and mixed with underground water, seawater or brine, and carbon dioxide and underground water at a flow rate higher than the rising speed of the bubbles by a pump installed on the ground or injection well, Seawater or brine The carbon dioxide is dissolved in underground water, seawater, or brine in the dissolution zone in the injection well by passing through a structure that reduces the cross-sectional area of the injection well as a phase flow. Carbon dioxide storage method.   Collect underground water, seawater or brine from the sampling well of the pumping well provided in the underground aquifer where the underground water, seawater or flood water where the carbon dioxide is to be stored exists. The pressurized carbon dioxide supplied from the carbon dioxide supply port provided in the underground portion of the injection well is supplied to underground water, seawater or brine, and the pressurized carbon dioxide is underground. Mixed and dissolved in water, seawater or brine, split carbon dioxide from a plurality of carbon dioxide supply ports provided in the injection well, mixed and pressurized carbon dioxide and underground water, The volume ratio of seawater or brine (carbon dioxide / underground water, seawater or brine) is in a state of 0.2 or less, and carbon dioxide is mixed with underground water, seawater or brine in the form of bubbles with a diameter of 5 mm or less. Or installed in the injection well A mixed phase flow of carbon dioxide and underground water, seawater or brine with a flow rate higher than the rising speed of bubbles by a pump, and carbon dioxide is dissolved in underground water, seawater or brine in the dissolution zone in the injection well. The carbon dioxide storage method according to claim 1.   Collect underground water, seawater or brine from the sampling well of the pumping well provided in the underground aquifer where the underground water, seawater or flood water where the carbon dioxide is to be stored exists. The pressurized carbon dioxide supplied from the carbon dioxide supply port provided in the underground portion of the injection well is supplied to underground water, seawater or brine, and the pressurized carbon dioxide is underground. It can be mixed and dissolved in water, seawater or brine, splitting and supplying carbon dioxide from a plurality of carbon dioxide supply ports provided in the injection well, pressurized carbon dioxide and underground water, seawater Or the volume ratio (carbon dioxide / underground water, seawater or brine) is 0.2 or less, and carbon dioxide is mixed with underground water, seawater or brine in the form of bubbles having a diameter of 5 mm or less, Po installed in the injection well By using a static stirrer, the carbon dioxide is submerged in the dissolution zone in the injection well by using a static stirrer. The method for storing carbon dioxide according to claim 1, wherein the carbon dioxide is dissolved in water, seawater or brine.   Collect underground water, seawater or brine from the sampling well of the pumping well provided in the underground aquifer where the underground water, seawater or flood water where the carbon dioxide is to be stored exists. The pressurized carbon dioxide supplied from the carbon dioxide supply port provided in the underground portion of the injection well is supplied to underground water, seawater or brine, and the pressurized carbon dioxide is underground. It can be mixed and dissolved in water, seawater or brine, splitting and supplying carbon dioxide from a plurality of carbon dioxide supply ports provided in the injection well, pressurized carbon dioxide and underground water, seawater Or the volume ratio (carbon dioxide / underground water, seawater or brine) is in a state of 0.2 or less, and carbon dioxide is mixed with underground water, seawater or brine in the form of bubbles with a diameter of 5 mm or less, and then injected on the ground or injected. Pong installed in the well This is a mixed phase flow of carbon dioxide and underground water, seawater, or brine, which has a flow rate higher than the rising speed of the bubbles, and passes through a structure that reduces the cross-sectional area of the injection well, allowing it to flow down and dissolve in the injection well. The carbon dioxide storage method according to claim 1, wherein carbon dioxide is dissolved in underground water, seawater, or brine in a section.   The carbon dioxide storage method according to claim 1, wherein carbon dioxide that has remained in an undissolved state and could not be flowed down as a mixed phase flow of carbon dioxide and underground water, seawater, or brine is supplied to the injection well. A carbon dioxide storage method characterized by being trapped by a mesh in a provided water pipe and preventing rising to a pressurized carbon dioxide supply port of an injection well.   A plurality of the pumping wells are provided, and at least one of the pumping wells is used in combination as an observation well for monitoring the abundance of carbon dioxide contained in the groundwater, seawater, or brine collected. The carbon dioxide storage method according to claim 1.   The carbon dioxide to be stored is pressurized with a pressurizing device installed on the ground, and the pressurized carbon dioxide is supplied from the carbon dioxide supply port at the top of the injection well to the carbon dioxide supply pipe in the injection well. Collect underground water, seawater, or brine from the water intake of the pumping well provided in the underground aquifer of 5-50 atm. In addition, the water supplied from the carbon dioxide supply port of the underground water, seawater or brine water distribution pipe installed in the underground part of the injection well through the underground water, seawater or brine distribution pipe in the injection well. Supply compressed carbon dioxide into underground water, seawater or brine, mix and dissolve carbon dioxide in underground water, seawater or brine, and underground water, seawater or flooded water with a water pressure of 5 to 50 atm exists. In the underground aquifer From outlet at the lower end of Nyui, water underground dissolved carbon dioxide, was discharged as a mixture with sea water or brine, carbon dioxide method of the storage, characterized in that for storing carbon dioxide.   The discharge port at the lower end of the injection well provided in the underground aquifer where the underground water, seawater or flood water of 5 to 50 atmospheres of water exists, and the carbon dioxide where the underground water, seawater or brine exists. The water intake of the pumping well provided in the underground aquifer having a water pressure of 5 to 50 atmospheres to be stored is separated from the discharge port by a distance of 5 times or more the thickness of the aquifer stored in the horizontal direction. The carbon dioxide storage method according to claim 12, wherein the carbon dioxide storage method is installed.   The carbon dioxide to be stored is pressurized with a pressurizing device installed on the ground, and the pressurized carbon dioxide is supplied from the carbon dioxide supply port at the upper end of the injection well to the supply pipe for carbon dioxide in the injection well. on the other hand, adopted the water underground trying to storing carbon dioxide, seawater or brackish water pumping wells provided in the ground aquifer of existing water pressure 5-50 atm adopted underground water from Mizuguchi, seawater or brackish It is supplied from the supply port of carbon dioxide in the underground water, seawater or brine water distribution pipe installed in the underground part of the injection well through the underground water, seawater or brine distribution pipe in the injection well. Supplying pressurized carbon dioxide into underground water, seawater or brine, mixing and dissolving carbon dioxide in underground water, seawater or brine, the underground water, seawater trying to store the carbon dioxide Or there is flood water After collecting water from the water intake of the pumping well provided in the underground aquifer with a water pressure of 5 to 50 atmospheres, pumping up to the ground, the water pipes for underground water, seawater, or brine in the injection wells After that, pressurized carbon dioxide supplied from the carbon dioxide supply port installed in the underground water, seawater or brine water distribution pipe in the underground part of the injection well is put into the underground water, seawater or brine. The carbon dioxide storage method according to claim 12, wherein the carbon dioxide storage method is supplied. The carbon dioxide to be stored is pressurized with a pressurizing device installed on the ground, and the pressurized carbon dioxide is supplied from the carbon dioxide supply port at the upper end of the injection well to the supply pipe for carbon dioxide in the injection well. On the other hand, underground water, seawater or brine is collected from the water intake of the pumping well provided in the underground aquifer where the underground water, seawater or flood water where carbon dioxide is to be stored exists. It is supplied from the supply port of carbon dioxide in the underground water, seawater or brine water distribution pipe installed in the underground part of the injection well through the underground water, seawater or brine distribution pipe in the injection well. Supplying pressurized carbon dioxide into underground water, seawater or brine, and mixing and dissolving carbon dioxide in underground water, seawater or brine, pressurized carbon dioxide and underground water, seawater or Volume ratio of brine (carbon dioxide / The lower water, seawater or brine) is in a state of 0.2 or less, and carbon dioxide is mixed in the form of bubbles with a diameter of 5 mm or less with underground water, seawater or brine, and bubbles are generated by a pump installed on the ground or in the injection well. 13. A mixed phase flow of carbon dioxide and underground water, seawater, or brine that has a flow rate higher than the rising speed, and carbon dioxide is dissolved in underground water, seawater, or brine in a dissolution zone in the injection well. The carbon dioxide storage method described.   The carbon dioxide to be stored is pressurized with a pressurizing device installed on the ground, and the pressurized carbon dioxide is supplied from the carbon dioxide supply port at the upper end of the injection well to the supply pipe for carbon dioxide in the injection well. On the other hand, underground water, seawater or brine is collected from the water intake of the pumping well provided in the underground aquifer where the underground water, seawater or flood water where carbon dioxide is to be stored exists. It is supplied from the supply port of carbon dioxide in the underground water, seawater or brine water distribution pipe installed in the underground part of the injection well through the underground water, seawater or brine distribution pipe in the injection well. Supplying pressurized carbon dioxide into underground water, seawater or brine, and mixing and dissolving carbon dioxide in underground water, seawater or brine, pressurized carbon dioxide and underground water, seawater or Volume ratio of brine (carbon dioxide / The lower water, seawater or brine) is in a state of 0.2 or less, and carbon dioxide is mixed in the form of bubbles with a diameter of 5 mm or less with underground water, seawater or brine, and bubbles are generated by a pump installed on the ground or in the injection well. The carbon dioxide and groundwater, seawater, or brine mixed-phase flow that has a flow velocity higher than the rising speed, and using a static stirrer, flow down, mix, and dissolve as a spiral flow. Carbon storage method.   The carbon dioxide to be stored is pressurized with a pressurizing device installed on the ground, and the pressurized carbon dioxide is supplied from the carbon dioxide supply port at the upper end of the injection well to the supply pipe for carbon dioxide in the injection well. On the other hand, underground water, seawater or brine is collected from the water intake of the pumping well provided in the underground aquifer where the underground water, seawater or flood water where carbon dioxide is to be stored exists. It is supplied from the supply port of carbon dioxide in the underground water, seawater or brine water distribution pipe installed in the underground part of the injection well through the underground water, seawater or brine distribution pipe in the injection well. Supplying pressurized carbon dioxide into underground water, seawater or brine, and mixing and dissolving carbon dioxide in underground water, seawater or brine, pressurized carbon dioxide and underground water, seawater or Volume ratio of brine (carbon dioxide / The lower water, seawater or brine) is in a state of 0.2 or less, and carbon dioxide is mixed in the form of bubbles with a diameter of 5 mm or less with underground water, seawater or brine, and bubbles are generated by a pump installed on the ground or in the injection well. It is a multiphase flow of carbon dioxide and underground water, seawater, or brine, which has a flow rate higher than the ascending speed, and is passed through a structure that reduces the cross-sectional area of the injection well. The carbon dioxide storage method according to claim 12, wherein carbon is dissolved in underground water, seawater, or brine.   The carbon dioxide to be stored is pressurized with a pressurizing device installed on the ground, and the pressurized carbon dioxide is supplied from the carbon dioxide supply port at the upper end of the injection well to the supply pipe for carbon dioxide in the injection well. On the other hand, underground water, seawater or brine is collected from the water intake of the pumping well provided in the underground aquifer where the underground water, seawater or flood water where carbon dioxide is to be stored exists. It is supplied from the supply port of carbon dioxide in the underground water, seawater or brine water distribution pipe installed in the underground part of the injection well through the underground water, seawater or brine distribution pipe in the injection well. Supplying pressurized carbon dioxide into underground water, seawater or brine, and mixing and dissolving carbon dioxide in underground water, seawater or brine, pressurized carbon dioxide and underground water, seawater or Volume ratio of brine (carbon dioxide / The lower water, seawater or brine) is in a state of 0.2 or less, and carbon dioxide is mixed in the form of bubbles with a diameter of 5 mm or less with underground water, seawater or brine, and bubbles are generated by a pump installed on the ground or in the injection well. 13. A mixed phase flow of carbon dioxide and underground water, seawater, or brine that has a flow rate higher than the rising speed, and carbon dioxide is dissolved in underground water, seawater, or brine in a dissolution zone in the injection well. The carbon dioxide storage method described.   The carbon dioxide to be stored is pressurized with a pressurizing device installed on the ground, and the pressurized carbon dioxide is supplied from the carbon dioxide supply port at the upper end of the injection well to the supply pipe for carbon dioxide in the injection well. On the other hand, underground water, seawater or brine is collected from the water intake of the pumping well provided in the underground aquifer where the underground water, seawater or flood water where carbon dioxide is to be stored exists. It is supplied from the supply port of carbon dioxide in the underground water, seawater or brine water distribution pipe installed in the underground part of the injection well through the underground water, seawater or brine distribution pipe in the injection well. Supplying pressurized carbon dioxide into underground water, seawater or brine, and mixing and dissolving carbon dioxide in underground water, seawater or brine, the underground water, seawater or Several charcoal dioxide in flooded water distribution pipes Carbon dioxide is divided and supplied from the supply port, and the volume ratio of pressurized carbon dioxide to underground water, seawater or brine (carbon dioxide / groundwater, seawater or brine) is 0.2 or less. Yes, carbon dioxide in the form of bubbles with a diameter of 5 mm or less and mixed with underground water, seawater or brine, and carbon dioxide and underground water at a flow rate higher than the rising speed of the bubbles by a pump installed on the ground or injection well, The mixed phase flow of seawater or brine and using a static stirrer, the carbon dioxide is dissolved in underground water, seawater or brine in a dissolution zone in the injection well by flowing down as a spiral flow. Carbon dioxide storage method.   The carbon dioxide to be stored is pressurized with a pressurizing device installed on the ground, and the pressurized carbon dioxide is supplied from the carbon dioxide supply port at the upper end of the injection well to the supply pipe for carbon dioxide in the injection well. On the other hand, underground water, seawater or brine is collected from the water intake of the pumping well provided in the underground aquifer where the underground water, seawater or flood water where carbon dioxide is to be stored exists. It is supplied from the supply port of carbon dioxide in the underground water, seawater or brine water distribution pipe installed in the underground part of the injection well through the underground water, seawater or brine distribution pipe in the injection well. Supplying pressurized carbon dioxide into underground water, seawater or brine, and mixing and dissolving carbon dioxide in underground water, seawater or brine, the underground water, seawater or Several charcoal dioxide in flooded water distribution pipes Carbon dioxide is divided and supplied from the supply port, and the volume ratio of pressurized carbon dioxide to underground water, seawater or brine (carbon dioxide / groundwater, seawater or brine) is 0.2 or less , Carbon dioxide in the form of bubbles with a diameter of 5 mm or less and mixed with underground water, seawater or brine, and the flow rate higher than the rising speed of bubbles by a pump installed on the ground or injection well, carbon dioxide and underground water, seawater Alternatively, it is a mixed phase flow of flooded water, and is passed through a structure that reduces the cross-sectional area of the injection well, so that carbon dioxide is dissolved in underground water, seawater, or brine in the dissolution zone in the injection well. The carbon dioxide storage method according to claim 12.   The carbon dioxide storage method according to claim 12, wherein carbon dioxide that has remained in an undissolved state and could not be flowed down as a mixed phase flow of carbon dioxide and underground water, seawater, or brine is supplied to the injection well. A carbon dioxide storage method characterized by being trapped by a mesh in a provided water pipe and preventing rising to a pressurized carbon dioxide supply port of an injection well.   A plurality of the pumping wells are provided, and at least one of the pumping wells is used in combination as an observation well for monitoring the abundance of carbon dioxide contained in the groundwater, seawater, or brine collected. The carbon dioxide storage method according to claim 12.