CN115892836B - Vibration-driven carbon dioxide electrocatalytic reduction geological sequestration method - Google Patents
Vibration-driven carbon dioxide electrocatalytic reduction geological sequestration methodInfo
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Abstract
The invention provides a method for vibration-driven carbon dioxide electrocatalytic reduction geological storage. Compared with the prior art, the method has the advantages that the quartz crystal in the sandstone reservoir is subjected to direct-current electric polarization to have a piezoelectric effect, then the quartz crystal in the reservoir is subjected to vibration activation to activate the catalytic activity of the CO 2 electric reduction catalyst, so that organic micromolecules such as formic acid, methanol and the like can be produced by catalyzing CO 2, the CO 2 is permanently and stably buried, meanwhile, snCl 2 can consume SnO 2 produced by O 2 produced by analysis of oxygen reaction at the anode part of the CO 2 electric reduction reaction, the SnO 2 can serve as a catalyst to further promote the CO 2 reduction reaction, the CO 2 buried quantity and buried efficiency are improved, H + is supplied to the cathode CO 2 reduction reaction, and the CO 2 reduction reaction is further accelerated.
Description
Technical Field
The invention belongs to the technical field of carbon dioxide geological sequestration, and particularly relates to a vibration-driven carbon dioxide electrocatalytic reduction geological sequestration method.
Background
The geological sequestration of CO 2 is the most feasible technology for sequestration of CO 2 at present due to the huge sequestration amount and low sequestration cost. However, the common geological CO 2 burying technology at present mainly injects CO 2 into a deep saline layer through high pressure, and utilizes structure trapping, hydrodynamic trapping and geochemical trapping (dissolution and mineralization trapping) to realize CO 2 burying. A plurality of problems are found in the implementation process of the CO 2 geological storage technology, including (1) poor storage stability and easy leakage of CO 2. Gaseous or supercritical CO 2 under high pressure is very easy to be emitted along high-permeability strips, cracks and the like in the geologic body, so that injected CO 2 returns to the environment again and is difficult to treat once leakage occurs, and (2) secondary geologic disasters are easy to be caused. The high-pressure gaseous and supercritical CO 2 injection damages a stratum stable pressure system, and causes the closing and opening of various stages of cracks in a short time, so that geological disasters such as earthquake, landslide and the like are caused. In conclusion, the existing CO 2 geological storage technology is optimized, so that the CO 2 storage function can be fully exerted, and the method has important practical significance.
The invention discloses an in-situ deep supercritical sealing method for flue gas, which is characterized in that a region within 10km from the surface of a flue gas discharge port is drilled, the flue gas is pressurized and then injected into a sealing layer in the deep region along the drilling well, the depth of the sealing layer from the surface is more than 2000 meters, the sealing layer is a key stratum in the deep region, the flue gas is stably and closely sealed below 2000 meters in a supercritical state, the long-term, safe and effective sealing effect is achieved, and the method adopts an in-situ deep injection mode of the flue gas near a power plant, does not need to carry out a process of trapping, purifying and transporting CO 2 and related technical equipment investment, simplifies injection links, and greatly saves operation cost.
The invention discloses a geological CO 2 sealing method and system, which comprise the steps of determining a CO 2 storage layer and a cover layer according to geological environment, excavating a CO 2 injection well and a saline water extraction well, wherein the CO 2 injection well and the saline water extraction well are communicated with the CO 2 storage layer, injecting CO 2 into the CO 2 storage layer through the CO 2 injection well, simultaneously extracting saline water in the CO 2 storage layer through the saline water extraction well, reducing the pressure of the CO 2 storage layer and improving the pore available space of the CO 2 storage layer, sealing CO 2 in the CO 2 storage layer, excavating the saline water extraction well while excavating the CO 2 injection well, injecting CO 2 into the CO 65356 storage layer through the CO 2 injection well, simultaneously extracting saline water in the CO 2 storage layer through the saline water extraction well, reducing the pressure of the CO 2 storage layer, improving the pressure of the CO 2 storage layer, and improving the total storage capacity of the CO 3448 storage layer, namely improving the sealing capacity of the storage layer, and sealing the storage layer of the CO 2.
Chinese patent application No. 201480022096.X discloses a method of storing CO 2 in a geological formation comprising (1) injecting a first composition comprising CO 2 into the formation, and (2) injecting a second composition comprising CO 2 and at least one CO 2 soluble polymer into the formation, wherein steps (1) and (2) are performed separately in any order, wherein the first and second compositions are different.
The invention discloses a method for sealing CO 2 by utilizing a goaf of a abandoned coal mine in a coal mine, which is characterized in that CO 2 gas obtained from a fixed emission source through separation and enrichment is compressed to a supercritical state and then is injected into the goaf of the abandoned coal mine in the coal mine, the goaf, an underground abandoned roadway and a chamber space are utilized for permanent sealing, a pressure measuring well is arranged to monitor the sealing condition of CO 2, and the safety of CO 2 sealing is ensured by controlling, reserving and reinforcing a separation coal pillar, arranging a separation wall and grouting to block a gap.
Chinese patent application number 201110126602.8 discloses a CO 2 geological storage system with excellent reliability for CO 2 geological storage and management. The CO 2 geological storage system comprises a CO 2 geological storage part for storing CO 2 stored in a plurality of storage tanks to a set horizon, and a CO 2 concentration detection part configured in an unsaturated zone below the ground surface corresponding to the stratum storing CO 2 and used for detecting the concentration of CO 2 on the unsaturated zone. The CO 2 geological storage unit includes a multi-manifold unit and a plurality of partial branches formed to introduce the geological storage CO 2 from a plurality of storage tanks, a distribution chamber unit having an inlet side connected to the multi-manifold unit and an outlet side connected to a perfusion pipe directed to the stratum, and supplying the CO 2 introduced through the multi-manifold unit to the perfusion pipe, a temperature adjusting unit for adjusting the temperature of the CO 2 introduced into the distribution chamber unit, and a flow rate and flow pressure adjusting unit for adjusting the flow rate and flow pressure of the CO 2 to be injected into the ground through the distribution chamber unit.
In the method, CO 2 is directly injected into various stratum through high pressure, and the method mainly has the following problems that (1) engineering difficulty is high. The geologic body has higher stratum pressure, the current CO 2 geologic burying technology can only press CO 2 into the geologic body by continuously increasing injection pressure, and (2) CO 2 is easy to leak. Inherent heterogeneity and anisotropy of the stratum cause CO 2 in a high-pressure gaseous state or a supercritical state to easily blow by along dominant seepage channels such as cracks, high-permeability strips and the like, so that the CO 2 burying efficiency is greatly reduced. And once leakage occurs, the leakage is difficult to treat, and (3) secondary geological disasters are caused. The high-pressure gaseous and supercritical CO 2 injection damages a stratum stable pressure system, and causes the closing and opening of various stages of cracks in a short time, so that geological disasters such as earthquake, landslide and the like are caused.
In order to effectively inhibit CO 2 gas channeling, researchers have researched a series of CO 2 channeling blocking agents, so that CO 2 gas channeling can be inhibited to a certain extent.
The Chinese patent with the application number 202111388475.9 discloses a chemical grouting liquid for repairing deep stratum CO 2 leakage and a preparation method thereof, belongs to the field of carbon dioxide trapping and emission reduction, and repairs faults and cracks of deep CO 2 geological reservoirs and solves the problem of CO 2 leakage by acid-resistant carbonate mineral particles formed by chemical reaction of the grouting liquid and the leaked CO 2. The reactive grouting liquid provided by the patent is environment-friendly, economical and simple to operate, can overcome the limitation of precipitation kinetics of acid-resistant magnesite particles, catalyzes rapid precipitation of acid-resistant magnesite particles in a CO 2 leakage area of a deep stratum, has the characteristics of low viscosity and wide permeation range, can enter fine pores and cracks and becomes a more promising reactive grouting liquid, can provide an effective chemical solution for leakage repair and fault healing of a deep CO 2 geological storage, and is suitable for popularization and application.
The Chinese patent with the application number of 202110396172.5 discloses a biological dissipation method for sealing CO 2 in a deep stratum, belongs to the field of carbon dioxide emission reduction, and can solve the problem that carbon dioxide is easy to leak and dissipate, and comprises the following steps of collecting geological data of sealing points of CO 2 and defining a CO 2 leakage path; arranging injection wells and production wells in the stratum above the sealing points, detecting whether the total amount of hydrogen sources in the stratum meets the biological conversion requirement of CO 2, injecting biological liquid and hydrogen-rich organic matters into the selected stratum through the injection wells, monitoring the content of methane and CO 2 in the selected stratum in real time, periodically detecting the microbial community composition, evaluating the leakage and biological conversion degree of the sealing CO 2, adjusting the flora structure, and extracting CH 4 generated through the production wells. The invention utilizes the capability of converting CO 2 by microorganisms to convert leaked CO 2 into CH 4 or organic matters above the sealing layer, thereby preventing CO 2 from escaping, and simultaneously, the invention can also recycle the leaked CO 2, thereby having environmental protection and energy significance.
The Chinese patent with the application number 201310297000.8 discloses a CO 2 gas-driven channeling-blocking agent for a high-temperature low-permeability oil reservoir, which belongs to the technical field of application of petroleum drilling engineering chemical agents and comprises, by weight, 4.5-7.5% of acrylamide, 0.2-0.5% of a modifier, 0.05-0.1% of an emulsifier, 0.02-0.05% of an initiator, 0.3-1% of N, N-methylene bisacrylamide, 0.1-0.5% of formaldehyde, 0.5-4.5% of a retarder and the balance of water. The channeling sealing agent provided by the patent has the characteristics of low viscosity under normal temperature without forming an adhesive tape piece, easiness in pumping into a stratum, high strength after gel formation, acid resistance, high temperature resistance, scouring resistance, stable performance, controllable gel formation time and high plugging rate.
However, the CO 2 channeling sealing agent has the following problems that (1) compared with other CO 2 embedding technologies, the CO 2 geological embedding technology has the advantages of large embedding quantity, low cost, economy and high efficiency. Injection of various complex channeling sealing agents, although improving the CO 2 embedding effect to a certain extent, the cost increase caused by the channeling sealing agents and the cost increase caused by the increase of engineering implementation difficulty, and greatly reducing the application value of the CO 2 geological embedding technology (2) triggering secondary geological disasters. The high-pressure gaseous and supercritical CO 2 injection damages a stratum stable pressure system, and causes the closing and opening of various stages of cracks in a short time, so that geological disasters such as earthquake, landslide and the like are caused.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a method for electrocatalytic reduction of geological sequestration of carbon dioxide driven by vibration, which can improve the sequestration amount and sequestration efficiency of CO 2.
The invention provides a vibration-driven carbon dioxide electrocatalytic reduction geological storage method, which comprises the following steps:
s1) taking a sandstone stratum rich in quartz as a sealing stratum, drilling an injection well and a production well to the sealing stratum, and shooting;
S2) connecting the injection well with the positive electrode of the power supply, connecting the extraction well with the negative electrode of the power supply, and disconnecting after applying voltage for a period of time;
S3) extracting formation water of the sealed formation through a production well, mixing the formation water with the CO 2 electro-reduction catalyst, and reinjecting the mixture into the sealed formation through an injection well;
S4) placing the vibration transmitter in an injection well, descending to a sealed stratum, and opening the vibration transmitter to transmit vibration waves;
S5) extracting formation water through a production well, mixing the formation water with CO 2 and SnCl 2, and continuously injecting the obtained mixed solution into a sealed formation through an injection well;
S6) stopping vibrating and injecting the mixed solution when the intensity of the vibration signal is reduced to a critical threshold value and the formation pressure is rapidly increased, and applying voltage between the injection well and the extraction well by the re-communicating circuit, wherein the positive and negative directions are opposite to the last time.
Preferably, the electric field strength of the voltage applied in the step S2) is 1800-2200V/100 m, and the time of applying the voltage is 10-30 h.
Preferably, the CO 2 electro-reduction catalyst in the step S3) is selected from one or more of Sn, pb, in, bi, ti, an oxide of the metal and an alloy catalyst of the metal, and the mass ratio of the formation water to the CO 2 electro-reduction catalyst is (50-150): 0.1.
Preferably, the CO 2 electro-reduction catalyst in the step S3) is selected from SnO 2, and the mass ratio of the formation water to the CO 2 electro-reduction catalyst is 100:0.1.
Preferably, in the step S4), the power of the vibration wave emitted by the vibration emitter is 400-800 w.
Preferably, in the step S5), the mass ratio of the formation water, the CO 2 and the SnCl 2 is (50-150): (10-20): 0.025 under the formation pressure condition.
Preferably, the mass ratio of the formation water, the CO 2 and the SnCl 2 in the step S4) under the formation pressure condition is 100:15:0.025.
Preferably, the speed of extracting formation water in the steps S3) and S5) is 100-200 cubic meters per day independently, and the speed of injecting the mixed solution into the sealed-up formation in the step S4) is 100-150 cubic meters per day.
Preferably, the electric field strength of the applied voltage in the step S5) is 1800-2200V/100 m, and the time of applying the voltage is 10-30 h.
The invention provides a vibration-driven carbon dioxide electrocatalytic reduction geological storage method, which comprises the steps of S1) taking a sandstone stratum rich in quartz as a sealed stratum, drilling an injection well and a production well to the sealed stratum and shooting the sandstone stratum, S2) connecting the injection well with a positive electrode of a power supply, connecting the production well with a negative electrode of the power supply, disconnecting the production well after a period of time after voltage is applied, S3) mixing formation water of the sealed stratum with CO 2 electric reduction catalyst after the production well is produced, reinjecting the formation water into the sealed stratum through the injection well, S4) lowering a vibration transmitter into the sealed stratum, opening the vibration transmitter to transmit vibration waves, placing a vibration signal collector into the production well, S5) extracting the formation water through the production well, then mixing the formation water with CO 2 and SnCl 2, continuously injecting the obtained mixed solution into the sealed stratum through the injection well, and S6) reducing the vibration signal strength to a critical threshold value, The formation pressure rises rapidly, vibration and mixed solution injection are stopped, the re-communication circuit applies voltage between the injection well and the extraction well, and the positive and negative directions are opposite to the last time. Compared with the prior art, the invention firstly uses the quartz crystal in the DC electrically polarized sandstone reservoir to have piezoelectric effect, and then uses the quartz crystal in the vibration activated reservoir to discharge and activate the catalytic activity of the CO 2 electro-reduction catalyst, thus catalyzing CO 2 to generate formic acid, Meanwhile, snCl 2 can consume SnO 2 generated by O 2 generated by analysis of oxygen reaction at the anode part of CO 2 electroreduction reaction, can be used as a catalyst to further promote CO 2 reduction reaction, improves CO 2 storage amount and storage efficiency, and also supplies H + for cathode CO 2 reduction reaction to further accelerate CO 2 reduction reaction.
Drawings
FIG. 1 is a schematic diagram of quartz crystals in sandstone reservoirs polarized by direct current in accordance with the present invention;
FIG. 2 is a schematic diagram of the distribution of the CO 2 injection electro-reduction catalyst in a formation according to the present invention;
FIG. 3 is a schematic diagram of the electrocatalytic conversion of voltage activated CO 2 in accordance with the present invention;
FIG. 4 is a graph showing the variation of formation pressure during carbon dioxide sequestration in example 1 and comparative example 1 of the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a vibration-driven carbon dioxide electrocatalytic reduction geological storage method which comprises the steps of S1) taking a sandstone stratum rich in quartz as a sealed stratum, drilling an injection well and a production well to the sealed stratum and shooting the sealed stratum, S2) connecting the injection well with a positive electrode of a power supply, connecting the production well with a negative electrode of the power supply, disconnecting the production well after a period of applied voltage, S3) mixing formation water of the sealed stratum with CO 2 electric reduction catalyst after the production well is used for producing the formation water, reinjecting the mixture into the sealed stratum through the injection well, S4) lowering a vibration transmitter into the sealed stratum, opening the vibration transmitter to transmit vibration waves, and placing a vibration signal collector into the production well, S5) continuously injecting the obtained mixed solution into the sealed stratum through the injection well, S6) stopping the injection of the vibration and the mixed solution after the vibration signal intensity is reduced to a critical threshold value, and rapidly rising the formation pressure, and applying a voltage between the injection well and the positive and negative electrodes in a reverse direction by a new circuit.
The source of all the raw materials is not particularly limited, and the raw materials are commercially available.
The invention takes a sandstone stratum rich in quartz as a sealing stratum, and drills an injection well and a production well to a target sealing stratum and shoots out, wherein the injection well and the production well are preferably two vertical wells.
Then, disconnecting after applying voltage between the injection well and the production well; in the invention, the injection well is preferably connected with the positive electrode of the power supply, the extraction well is preferably connected with the negative electrode of the power supply, the voltage is preferably direct current, the electric field strength is preferably 1800-2200V/100 m, more preferably 2000V/100m, the electric field strength in the sealed stratum is preferably 1800-2500V/100 m, more preferably 2000V/100m, the time for applying the voltage is preferably 10-30 h, more preferably 12-24 h, and the purpose of the step is to polarize quartz crystals in the sandstone reservoir by using direct current, as shown in figure 1. The natural quartz crystal has isotropic characteristics, and the piezoelectric effect is weak. After the electric field is applied, the symmetry of the quartz crystal structure is destroyed, a polarization axis different from other crystal axes is formed, positive and negative charge centers are not coincident, the polarization effect is obviously enhanced, and the piezoelectric effect is more obvious. The quartz crystal can keep certain residual polarization after the external electric field is removed, and has stronger piezoelectric effect.
The method comprises the steps of mixing formation water of a sealed formation with CO 2 electro-reduction catalyst after the formation water is extracted through an extraction well, wherein the extraction speed of the formation water is preferably 50-150 cubic meters per day, more preferably 80-120 cubic meters per day, still more preferably 100 cubic meters per day, the CO 2 electro-reduction catalyst is preferably nano particles, the type of the CO 2 electro-reduction catalyst is preferably Sn, pb, in, bi, ti, one or more of the metal oxides and the metal alloy catalysts is more preferably SnO 2, the mass ratio of the formation water to the CO 2 electro-reduction catalyst is preferably (50-150): 0.1, more preferably (80-120): 0.1, still more preferably (90-110): 0.1, most preferably 100:0.1, and the obtained mixed solution is continuously injected back into the sealed formation through an injection well, the injection speed is preferably 50-150 cubic meters per day, more preferably 100-130 cubic meters per day, and the mass ratio of the mixed solution is shown in FIG. 2, and the mass ratio of the mixed solution is shown as the CO 2 in the electro-reduction catalyst.
In the invention, the vibration transmitter is preferably arranged in the injection well and lowered to the sealed stratum, the vibration transmitter is arranged in the sealed stratum and used for collecting vibration signals, the power of the vibration transmitter for transmitting the vibration waves is preferably 400-800W, more preferably 500-700W, and still more preferably 600W. The purpose of this step is to vibrate to activate the piezoelectric material-quartz power generation in the sandstone reservoir. And binding charges appear at two ends of the polarized quartz, which are perpendicular to the polarization direction, and the binding charges attract free charges in the environment so that the quartz crystal is electrically neutral. And applying an external pressure parallel or perpendicular to the polarization direction to the polarized quartz crystal, so that the quartz crystal is deformed, the inter-layer distance of bound charges in the crystal is reduced, and free charges of the crystal face are excessive to generate discharge.
The method comprises the steps of extracting stratum water through an extraction well, mixing the stratum water with CO 2 and SnCl 2, injecting the obtained mixed solution into a sealed stratum through an injection well, wherein the speed of the extracted stratum water is preferably 100-200 cubic meters per day, more preferably 120-140 cubic meters per day, still more preferably 130 cubic meters per day, the mass ratio of the stratum water to CO 2 to the SnCl 2 is preferably (50-150): 10-20): 0.025), more preferably (80-120): 13-17): 0.025, still more preferably (90-110): 14-16): 0.025, most preferably 100:15:0.025, injecting the mixed solution into the sealed stratum through the injection well, preferably 100-200 cubic meters per day, more preferably 120-140 cubic meters per day, still more preferably 130 cubic meters per day, and recycling through adding CO 2 and SnCl 2. CO 2+H2O+SnCl2 is injected under the condition of pre-injecting CO 2 electro-reduction catalyst such as SnO 2, so that the long-term and stable conversion of CO 2 can be realized.
During the process, the ultrasonic wave stimulates the quartz crystal to generate electricity, and CO 2 is electrically reduced. Referring to fig. 3, fig. 3 is a schematic diagram of a quartz crystal power generation activated CO 2 electro-catalytic conversion, and in the reduction process, a CO 2 electro-reduction catalyst can catalyze CO 2 to generate formic acid, methanol and the like. Under the vibration action, quartz discharge activates the catalytic activity of the CO 2 electro-reduction catalyst to catalyze CO 2 to generate organic micromolecules such as formic acid, methanol and the like, so that CO 2 is permanently and stably buried. The reaction formula is as follows:
cathode reaction, CO 2+2H++2e- = HCOOH
Anodic reaction H 2O-4e-＝4H++O2
Meanwhile, the step can also realize that SnCl 2 consumes CO 2 reduction reaction by-product O 2 and generates SnO 2 to continue to catalyze CO 2 reduction. Oxygen evolution reaction occurs at the anode part in the CO 2 electrocatalytic reduction reaction, and SnCl 2 is injected to react with the evolved O 2, so that O 2 is consumed, and SnO 2,SnO2 is generated as a catalyst to further promote the CO 2 reduction reaction, and the CO 2 storage quantity and the storage efficiency are improved. Simultaneously, H + is supplied to the cathodic CO 2 reduction reaction, and the CO 2 reduction reaction is further accelerated. The reaction formula is as follows:
SnCl2+1/2O2+H2O＝SnO2+2HCl
When the vibration signal intensity is reduced to a critical threshold value, the formation pressure is quickly increased, the vibration and the mixed solution injection are stopped, the voltage is applied between the injection well and the extraction well by the re-communication circuit, and the positive and negative directions are opposite to the last time, in the invention, the voltage is preferably applied to ensure that the electric field intensity in the sealed formation is 1800-2200V/100 m, more preferably 2000V/100m, and the time of applying the voltage is preferably 10-30 h, more preferably 12-24 h. The quartz polarization gradually weakens along with the time extension, the capacity of vibration to generate charges gradually weakens, so that the CO 2 electric reduction speed is greatly reduced, the circuit is re-communicated, and quartz is polarized again, so that the quartz can always generate high-density charges under the vibration condition, and the CO 2 electric reduction efficiency is ensured.
The invention firstly uses quartz rich in a DC electrically polarized sandstone reservoir to enable the quartz to have piezoelectric effect, then uses vibration to activate quartz crystal to generate electricity, and uses the reservoir discharge to activate the catalytic activity of CO 2 electro-reduction catalyst under the vibration effect to catalyze CO 2 to generate formic acid, methanol and other small organic molecules, thus realizing the permanent stable burying of CO 2, meanwhile, snCl 2 can consume SnO 2 generated by O 2 generated by the analysis oxygen reaction at the anode part, and can be used as a catalyst to further promote the CO 2 reduction reaction, improve the burying amount and burying efficiency of CO 2, also supply H + for the cathode CO 2 reduction reaction and further accelerate the CO 2 reduction reaction.
In order to further illustrate the invention, a method for vibration-driven carbon dioxide electrocatalytic reduction geological storage is provided in detail below with reference to examples.
The reagents used in the examples below are all commercially available.
Example 1
(1) Selecting a sandstone stratum rich in quartz as a target horizon, wherein the stratum pressure of the target horizon is about 9.5MPa, and the stratum temperature is 40 ℃;
(2) Two vertical wells are used as injection wells and extraction wells, drilled to a target horizon and shot;
(3) The injection well is connected with the positive electrode of the power supply, the extraction well is connected with the negative electrode of the power supply, and a 2000V/100m direct current electric field is applied between the two wells. The circuit is disconnected after being communicated for 1 day;
(4) The formation water extracted at a rate of 100 cubic meters per day is uniformly mixed with nano SnO 2 particles or the like (CO 2 electro-reduction catalyst) at a mass ratio of 100:0.1 through the extraction well, and is reinjected into the target formation at a rate of 100 cubic meters per day through the injection well.
(4) The vibration transmitter is arranged in the injection well and descends to a target horizon, and the vibration transmitter is turned on to transmit vibration waves to the target stratum with 600W power;
(5) Formation water produced at a rate of 100 cubic meters per day was mixed uniformly with CO 2 and SnCl 2 (at a mass ratio of 100:15:0.025) (under formation pressure conditions) and injected slowly into the deep formation through the injection well at a rate of 130 cubic meters per day. At this stage, the formation pressure is around 14.0MPa and remains stable for a long period of time.
(6) When the signal intensity of the vibration signal collector is continuously reduced to a critical threshold value (25% of the initial signal intensity), the formation pressure is rapidly increased again. And (3) connecting the direct current circuit again, applying a 2000V/100m direct current electric field between the two wells for 1 day, and then continuing the CO 2 burying work.
Comparative example 1
(1) Selecting a sandstone stratum rich in quartz as a target horizon, wherein the stratum pressure of the target horizon is about 9.5MPa, and the stratum temperature is 40 ℃;
(2) Two vertical wells are used as injection wells and extraction wells, drilled to a target horizon and shot;
(3) Formation water produced at a rate of 100 cubic meters per day and CO 2 were mixed uniformly at a mass ratio (100:15) (under formation pressure conditions) and injected slowly through an injection well into a deep formation at a rate of 130 cubic meters per day. Because of unbalanced injection and production, the formation pressure continuously rises from 11.5MPa in the initial stage to about 13.7MPa and finally to about 16.6MPa, and then the well is shut in.
Referring to fig. 4, fig. 4 is a graph showing the variation of formation pressure during carbon dioxide sequestration in example 1 and comparative example 1 of the present invention. As can be seen from fig. 4, the formation pressure in the stage of CO 2 injection in the comparative example 1 is fast increased by the conventional method, which means that the conventional CO 2 has limited storage amount, poor storage stability, low storage efficiency and poor storage safety, and the formation pressure is fast reduced after the novel technique is used in the example 1, and along with long-term stability, it means that CO 2 injection has been converted, and is not in a gaseous state, so that the storage amount of CO 2 can be greatly increased, the storage stability of CO 2 can be significantly changed, and the storage safety can be significantly improved.
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| CN115892836A (en) | 2023-04-04 |
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