CN113187450B - CO (carbon monoxide) 2 Electric reduction burying and oil extraction method - Google Patents
CO (carbon monoxide) 2 Electric reduction burying and oil extraction method Download PDFInfo
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- CN113187450B CN113187450B CN202110656839.0A CN202110656839A CN113187450B CN 113187450 B CN113187450 B CN 113187450B CN 202110656839 A CN202110656839 A CN 202110656839A CN 113187450 B CN113187450 B CN 113187450B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
Abstract
The application discloses a CO 2 An electroreduction method for recovering oil and recovering oil based on the catalytic negative electrode and inert positive electrode respectively connected to the injection well and the extraction well in the same communicated well group includes adding CO 2 Injecting a crude oil reservoir through the injection well; energizing the catalytic negative electrode and the inert positive electrode; using the catalytic negative electrode and the inert positive electrode to CO 2 Performing in-situ electroreduction to remove CO 2 Conversion to the target product to CO 2 And the target product is used for displacing crude oil, and the catalytic cathode and the inert anode are also used for carrying out in-situ crude oil electrocatalytic cracking to improve the flowability of the crude oil. CO as described above 2 The method for electric reduction and oil recovery can improve CO 2 The method has the advantages of improving the recovery ratio of the oil deposit, ensuring the energy safety and reducing the emission of greenhouse gases.
Description
Technical Field
The invention belongs to crude oil extraction and CO 2 The technical field of sequestration, in particular to CO 2 An electroreduction burying and oil extraction method.
Background
Currently, CO 2 Emission reduction, capture and sequestration have risen to the national governance level, and CO 2 The technology of burying and improving the recovery ratio has important significance for national greenhouse gas emission reduction and fossil energy safety, and is concerned more and more widely. However, CO is now common 2 Technology for sequestration and enhanced recovery (CO) 2 Immiscible phase flooding, CO 2 Miscible flooding, CO 2 Supercritical flooding, carbonated water flooding, etc.) primarily of CO 2 Injection into reservoir for CO 2 Physical sequestration, in the process, CO is not sequestered 2 Undergoes chemical conversion so that CO is present 2 Low burying efficiency and poor effect of improving the recovery ratio.
For example, there is now a well over-critical over-injection of CO 2 The technology for realizing maximum solid burying and residual oil displacement comprises a high-pressure air pump injection well, an oil production well, a plugging area and pressureCracks, broken cracks and CO 2 A dispersion area, injecting CO into the oil layer of the waste oil field or the oil area by a high-pressure air pump through an injection well at supercritical pressure 2 The method utilizes the super-strong permeability, diffusivity and cleaning capacity of the solution to displace thick, sticky and scattered residual oil to be discharged from an oil well, and injects plugging materials into an injection well at intervals and repeatedly to block a smooth channel between the injection well and the oil well to force CO 2 Liquid diffusion pressurization, fracturing oil layer interlayer and penetrating same-layer oil area interval, diffusion to all intervals, dead angles and blind areas, and the scheme is used for completely displacing residual oil and burying and fixing CO 2 Large amount, stable storage, reduced air pollution and no underground pollution. However, this solution has the following drawbacks: injecting supercritical CO into the seam net development area 2 The gas channeling is serious, so the extraction effect is poor; large amount of supercritical CO 2 Extracting light components in the crude oil to cause asphaltene precipitation, so that a flow space is easy to block; supercritical CO 2 After injection, it is rapidly extracted, so that CO 2 The burying efficiency is low.
Disclosure of Invention
In order to solve the problems, the invention provides CO 2 The electroreduction method for burying and oil extraction can increase CO 2 The method has the advantages of improving the recovery ratio of the oil deposit, ensuring the energy safety and reducing the emission of greenhouse gases.
The invention provides a CO 2 An electroreduction sequestration and oil recovery method based on a catalytic negative electrode and an inert positive electrode respectively connected to an injection well and a production well within the same interconnected well group, comprising:
introducing CO 2 Injecting a crude oil reservoir through the injection well;
energizing the catalytic negative electrode and the inert positive electrode;
using the catalytic negative electrode and the inert positive electrode to CO 2 Performing in-situ electroreduction to remove CO 2 Conversion to the target product to CO 2 And the target product is used for displacing crude oil, and the catalytic cathode and the inert anode are also used for carrying out in-situ crude oil electrocatalytic cracking so as to improve the fluidity of the crude oil.
Preferably, in the aboveCO mentioned above 2 In the electroreduction sequestration and oil recovery method, water and nano-particles are mixed with the CO 2 And injecting the nano particles into the crude oil reservoir through the injection well, wherein the nano particles at least comprise particles with the same material as the catalytic negative electrode.
Preferably, in the above CO 2 In the electroreduction sequestration and oil extraction method, the nanoparticles also comprise particles made of the same material as the inert positive electrode.
Preferably, in the above CO 2 In the electro-reduction sequestration and oil recovery method, the diameter of the nano-particles is 10nm to 150nm.
Preferably, in the above CO 2 In the electroreduction sequestration and oil recovery method, the water and nanoparticles are mixed with the CO 2 Prior to simultaneous injection into the crude oil reservoir through the injection well, further comprising:
CO injection using high temperature high pressure vessels simulating formation conditions 2 Water and the nano particles are stirred into a mixed solution.
Preferably, in the above CO 2 In the electroreduction oil-burying and oil-extracting method, when the low-permeability oil reservoir is exploited, 10m is used 3 D to 20m 3 (ii) injecting the mixed solution into the crude reservoir at a rate of/d;
when a fractured reservoir is produced, 10m 3 D to 15m 3 The velocity of/d injects the mixed solution into the crude oil reservoir.
Preferably, in the above CO 2 In the electroreduction sequestration and oil recovery method, the mass fraction of the nanoparticles in the mixed solution is 0.01% to 0.05%.
Preferably, in the above-mentioned CO 2 In the method for electroreduction sequestration and oil recovery, the energizing the catalytic negative electrode and the inert positive electrode comprises:
and electrifying the catalytic cathode and the inert anode until the voltage gradient is 500.0V/m to 1000.0V/m.
Preferably, in the above CO 2 In the electroreduction sequestration and oil extraction method, the catalytic cathode is a catalytic electrode with a target product of methane, and the target product is the catalysis of methanolThe electrode or the target product is a formic acid catalytic electrode, and the inert positive electrode is a C electrode or a Pt electrode.
Preferably, in the above CO 2 In the electroreduction sequestration and oil extraction method, the diameters of the catalytic cathode and the inert anode are 1cm to 6cm.
As apparent from the above description, the present invention provides the above CO 2 The electroreduction method for sequestration and oil production includes the first CO 2 Injecting a crude oil reservoir through the injection well; then electrifying the catalytic cathode and the inert anode; finally, the catalytic cathode and the inert anode are utilized to couple CO 2 Performing in-situ electroreduction to remove CO 2 Conversion to the target product to CO 2 The target product is used for displacing crude oil, and the catalytic cathode and the inert anode are used for carrying out in-situ crude oil electrocatalytic cracking to improve the fluidity of the crude oil, so that the method can improve CO 2 The oil reservoir burying efficiency can also improve the recovery ratio of the oil reservoir, ensure the energy safety and reduce the emission of greenhouse gases.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 shows a CO according to the present invention 2 A schematic of an embodiment of an electroreductive sequestration and recovery process;
FIG. 2 shows CO 2 A schematic diagram of an electrorecovery sequestration and production system;
FIG. 3 is a schematic diagram of a core recovery curve under different displacement regimes;
FIG. 4 shows CO 2 Displacement and CO 2 Electroreduction of displaced CO 2 And burying efficiency schematic diagram.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides CO 2 The method for electric reduction and oil recovery can improve CO 2 The method has the advantages of improving the recovery ratio of the oil deposit, ensuring the energy safety and reducing the emission of greenhouse gases.
The invention provides CO 2 The embodiment of the electroreduction sequestration and oil recovery method is shown in figures 1 and 2, wherein figure 1 is CO provided by the invention 2 FIG. 2 is a schematic diagram of an embodiment of an electroreductive sequestration and oil recovery process, with CO 2 The schematic diagram of the electric reduction sequestration and oil production system is that based on the catalytic negative electrode 203 and the inert positive electrode 204 which are respectively connected to the injection well 201 and the production well 202 in the same communicated well group, the proper catalytic negative electrode can be selected according to the characteristics of crude oil, and different types of catalytic negative electrodes correspond to different CO 2 The electrical reduction product, different crude oil catalytic cracking paths, may play different roles in the enhanced oil recovery process, wherein the catalytic cathode 203 is powered by the cathode 207 of the power generation device 205, and the inert anode 204 is powered by the anode 206 of the power generation device 205, it should be noted that the power generation device is not limited to a common generator, and may also be a power generation device using renewable energy, such as a wind power generation device or a photovoltaic power generation device, and the method may include the following steps:
s1: introducing CO 2 Injecting a crude oil reservoir through an injection well 201;
note that CO is 2 The injection can be carried out under normal pressure or high pressure, and is not limited in the above, and the injection can be used for displacing crude oil, and the appropriate injection speed can be selected according to the actual situation of the crude oil.
S2: electrifying the catalytic cathode and the inert anode;
the electric field intensities of the catalytic negative electrode and the inert positive electrode can be adjusted to optimum values by adjusting the power generation device.
S3: using catalytic negative and inert positive electrode to CO 2 Performing in-situ electroreduction to remove CO 2 Conversion to the target product to CO 2 The target products can be, but are not limited to, formic acid, methanol and methane, and the crude oil is displaced by the target products, and the crude oil is subjected to in-situ electro-catalytic cracking by a catalytic cathode and an inert anode so as to improve the fluidity of the crude oil.
Note that, in this case, CO 2 The catalytic negative electrode can be CO simultaneously injected and the electric field applied 2 Reaction occurs, so that the buried CO is not easy to leak, and CO is realized 2 The sequestration efficiency is greatly improved, and theoretically CO firstly occurs 2 Electroreduction of CO 2 Is totally consumed to generate formic acid, methanol and the like which are dissolved in water to displace crude oil, and actually, the efficiency of a catalytic electrode is limited, and part of CO 2 The electric reduction generates formic acid, methanol is dissolved in water to displace crude oil, and the other part of unreduced CO 2 The two electrodes can be used for carrying out crude oil catalytic cracking, so that the flowability of the crude oil is improved, and the crude oil can be further conveniently exploited.
It is also noted that the presence of the electric field and the catalytic electrode catalyzes CO 2 Formic acid, methanol, methane and the like generated by electroreduction can change the original oil-water-rock reaction of the oil reservoir, so that the recovery ratio is improved, in addition, the crude oil can be effectively catalytically cracked by the existence of an electric field and a catalytic electrode, the in-situ modification of the crude oil is realized, the viscosity of the crude oil is reduced, the flowability is improved, and the three actions are mutually cooperated and jointly promoted, so that the recovery ratio of the oil reservoir can be obviously improved.
As apparent from the above description, the present invention provides the above CO 2 In the embodiment of the electroreduction sequestration and oil production method, the CO is firstly added 2 Injecting a crude oil reservoir through an injection well; then electrifying the catalytic cathode and the inert anode; finally, CO is paired by utilizing a catalytic cathode and an inert anode 2 Performing in-situ electroreduction to remove CO 2 Conversion to the target product to CO 2 The target product is used for displacing the crude oil, and the catalytic cathode and the inert anode are used for carrying out in-situ crude oil electrocatalytic cracking to improve the fluidity of the crude oil, so that the method can improve CO 2 The oil reservoir burying efficiency can also improve the recovery ratio of the oil reservoir, ensure the energy safety and reduce the emission of greenhouse gases.
In the above-mentioned CO 2 In one embodiment of the electroreductive sequestration and oil recovery process, with continued reference to FIG. 2, water and nanoparticles 208 may be admixed with CO 2 Simultaneously injecting the crude oil reservoir through an injection well, wherein the nano particles at least comprise particles made of the same material as the catalytic negative electrode, and the nano particles can be used for realizing the purpose of being contacted with CO when the distance between the two electrodes is larger 2 Ensures that the reaction is carried out more rapidly, and also mixes water and nanoparticles with CO 2 Before the crude oil reservoir is injected through the injection well, the method can also comprise the following steps:
with continued reference to FIG. 2, the CO is introduced using a high temperature, high pressure vessel 209 that simulates formation conditions 2 Water and nanoparticles into a mixed solution, so that as much CO as possible can be injected 2 And the nanoparticles allow the reaction to proceed faster, water being the solvent. In a further preferred embodiment, the nanoparticles may further include particles made of the same material as that of the inert positive electrode, so that the reaction rate of the negative electrode can be increased, and the reaction rate of the positive electrode can be increased. After the nanoparticles are injected, the micro-nano-scale electrodes are injected into the oil reservoir, and once the electrodes are electrified, CO exists in the oil reservoir 2 The reaction rate is faster through the electro-reduction and crude oil cracking reaction.
Wherein the nanoparticles may preferably have a diameter of 10nm to 150nm, and the nanoparticles are of a size that accelerates the reaction to allow CO to react 2 The electrode reacts more rapidly to obtain the target product, although other diameters can be selected according to actual needs, and are not limited herein.
In one specific example, when low permeability reservoirs are produced, it may be at 10m 3 D to 20m 3 The mixed solution is injected at a speed of/dIn a crude oil reservoir;
when a fractured reservoir is produced, 10m 3 D to 15m 3 The velocity of/d injects the mixed solution into the crude reservoir.
Of course, this can be chosen according to the actual situation, and the speed is not limited here.
In the above-mentioned CO 2 In a preferred embodiment of the method for electroreductive sequestration and oil recovery, the mass fraction of nanoparticles in the mixed solution may preferably be 0.01% to 0.05%. In the above-mentioned CO 2 In a preferred embodiment of the electroreductive sequestration and oil recovery process, energizing the catalytic negative electrode and the inert positive electrode may comprise energizing the catalytic negative electrode and the inert positive electrode to a voltage gradient of 500.0V/m to 1000.0V/m.
It will be appreciated by those skilled in the art that the catalytic negative electrode described above may be a catalytic electrode targeted to methane, methanol or formic acid, and the inert positive electrode may be a C electrode or Pt electrode. In particular, the catalytic negative electrode may be a Cu electrode, the product of which may be an alcohol or a hydrocarbon including methanol, and CO may be introduced 2 The electro-reduction is methane, and can be a Pb electrode, hg electrode, in electrode, sn electrode, bi electrode, cd electrode or Tl electrode, and the product can be formic acid or formate.
In the above-mentioned CO 2 In a preferred embodiment of the process for electroreduction sequestration and oil recovery, the catalytic negative electrode and the inert positive electrode have a diameter of 1cm to 6cm, the electrodes being of such a large size as to be compatible with CO 2 The contact area between the two is larger, so that the reaction rate is faster and more sufficient, and other sizes can be selected according to the actual perforation length of the oil well, and the size is not limited here, and further 5cm can be preferred.
Note that the existing CO 2 Sequestration and CO 2 In the displacement process, CO 2 The sequestration efficiency of (CO) is only 30% -50%, and the CO is adopted 2 The mode of electroreduction and sequestration can greatly promote CO 2 The burying efficiency is even up to 70%.
Selecting a certain oil reservoir core to develop the coreDisplacement experiments, comparison of CO 2 Electroreduction displacement, CO 2 Displacement and formation water displacement vs. recovery and CO 2 The influence of the burial efficiency, the parameters are shown in table 1:
table 1 core physical properties parameters for displacement
FIG. 3 is a schematic diagram of the core recovery curves for different displacement systems, and from FIG. 3, it can be seen that the CO is relative to the formation water displacement mode 2 The electroreduction displacement can obviously improve the recovery ratio of the oil reservoir.
FIG. 4 shows CO 2 Displacement and CO 2 Electroreduction of displaced CO 2 The sequestration efficiency is illustrated schematically in FIG. 4, using CO 2 During displacement, CO 2 The sequestration efficiency is about 45.6%, and CO is used 2 In the electroreduction mode, CO 2 The burying efficiency of the buried layer is as high as 70.4 percent.
To sum up, CO can be seen 2 The electroreduction mode can effectively improve CO 2 The sequestration efficiency and the oil reservoir recovery rate have important practical significance for guaranteeing national energy safety and greenhouse gas emission reduction.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. CO (carbon monoxide) 2 The method for electric reduction sequestration and oil recovery is based on a catalytic negative electrode and an inert positive electrode which are respectively connected to an injection well and a production well in the same communicated well group, and is characterized by comprising the following steps:
mixing water and nanoparticles with CO 2 Simultaneously injecting the crude oil reservoir through the injection well, wherein the nano particles at least comprise particles with the same material as the catalytic cathode, and the nano particles also comprise particles with the same material as the inert anode;
energizing the catalytic negative electrode and the inert positive electrode;
using the catalytic negative electrode and the inert positive electrode to CO 2 Performing in-situ electro-reduction to remove CO 2 Conversion to the target product to CO 2 And the target product is used for displacing crude oil, and the catalytic cathode and the inert anode are also used for carrying out in-situ crude oil electrocatalytic cracking so as to improve the fluidity of the crude oil.
2. CO according to claim 1 2 The electro-reduction sequestration and oil recovery method is characterized in that the diameter of the nano-particles is 10nm to 150nm.
3. CO according to claim 1 2 Electroreduction sequestration and oil recovery process characterized in that said water and nanoparticles are mixed with said CO 2 Prior to simultaneous injection into the crude oil reservoir through the injection well, further comprising:
CO injection using high temperature high pressure vessels simulating formation conditions 2 Water and the nano particles are stirred into a mixed solution.
4. CO according to claim 3 2 The electroreduction sequestration and oil recovery method is characterized in that when low permeability oil reservoir is exploited, 10m is used 3 D to 20m 3 Injecting the mixed solution into the crude oil reservoir at a rate of/d;
when a fractured reservoir is produced, 10m 3 D to 15m 3 (ii) injecting the mixed solution into the crude reservoir at a rate/d.
5. CO according to claim 3 2 The electroreduction sequestration and oil recovery method is characterized in that the mass fraction of the nanoparticles in the mixed solutionThe number is 0.01% to 0.05%.
6. CO according to claim 1 2 The electroreduction sequestration and oil recovery method is characterized in that the electrifying the catalytic cathode and the inert anode comprises the following steps:
and electrifying the catalytic negative electrode and the inert positive electrode until the voltage gradient is 500.0V/m to 1000.0V/m.
7. CO according to any one of claims 1 to 6 2 The electroreduction sequestration and oil extraction method is characterized in that the catalytic cathode is a catalytic electrode with a target product of methane, a catalytic electrode with a target product of methanol or a catalytic electrode with a target product of formic acid, and the inert anode is a C electrode or a Pt electrode.
8. CO according to claim 7 2 The electroreduction sequestration and oil extraction method is characterized in that the diameters of the catalytic cathode and the inert anode are 1cm to 6cm.
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