CN116515471A - Integrated CCUS-EOR method and oil displacement agent - Google Patents
Integrated CCUS-EOR method and oil displacement agent Download PDFInfo
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 43
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 122
- 239000012621 metal-organic framework Substances 0.000 claims abstract description 111
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 61
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000012530 fluid Substances 0.000 claims abstract description 37
- 238000002347 injection Methods 0.000 claims abstract description 33
- 239000007924 injection Substances 0.000 claims abstract description 33
- 230000000694 effects Effects 0.000 claims abstract description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 17
- 239000013105 nano metal-organic framework Substances 0.000 claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 239000013154 zeolitic imidazolate framework-8 Substances 0.000 claims description 40
- MFLKDEMTKSVIBK-UHFFFAOYSA-N zinc;2-methylimidazol-3-ide Chemical compound [Zn+2].CC1=NC=C[N-]1.CC1=NC=C[N-]1 MFLKDEMTKSVIBK-UHFFFAOYSA-N 0.000 claims description 35
- 239000002245 particle Substances 0.000 claims description 32
- 230000008569 process Effects 0.000 claims description 18
- 239000007787 solid Substances 0.000 claims description 18
- 150000001875 compounds Chemical class 0.000 claims description 17
- 239000007921 spray Substances 0.000 claims description 16
- 239000013289 nano-metal-organic framework Substances 0.000 claims description 14
- 239000008398 formation water Substances 0.000 claims description 11
- 239000008367 deionised water Substances 0.000 claims description 9
- 229910021641 deionized water Inorganic materials 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- LXBGSDVWAMZHDD-UHFFFAOYSA-N 2-methyl-1h-imidazole Chemical compound CC1=NC=CN1 LXBGSDVWAMZHDD-UHFFFAOYSA-N 0.000 claims description 4
- XIOUDVJTOYVRTB-UHFFFAOYSA-N 1-(1-adamantyl)-3-aminothiourea Chemical compound C1C(C2)CC3CC2CC1(NC(=S)NN)C3 XIOUDVJTOYVRTB-UHFFFAOYSA-N 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract description 52
- 238000011084 recovery Methods 0.000 abstract description 38
- 239000010779 crude oil Substances 0.000 abstract description 30
- 239000000463 material Substances 0.000 abstract description 28
- 230000008901 benefit Effects 0.000 abstract description 19
- 230000006872 improvement Effects 0.000 abstract description 16
- 230000009919 sequestration Effects 0.000 abstract description 16
- 238000001179 sorption measurement Methods 0.000 abstract description 14
- 230000009467 reduction Effects 0.000 abstract description 9
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- 230000007246 mechanism Effects 0.000 abstract description 8
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- 239000010457 zeolite Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 239000002332 oil field water Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000013153 zeolitic imidazolate framework Substances 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 229920001795 coordination polymer Polymers 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 239000013110 organic ligand Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
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- 230000000750 progressive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001338 self-assembly Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- 238000009736 wetting Methods 0.000 description 1
- -1 zeolite imidazole ester Chemical class 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/594—Compositions used in combination with injected gas, e.g. CO2 orcarbonated gas
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G83/00—Macromolecular compounds not provided for in groups C08G2/00 - C08G81/00
- C08G83/008—Supramolecular polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/10—Nanoparticle-containing well treatment fluids
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- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
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Abstract
The application relates to the technical field of oil displacement, and discloses an integrated CCUS-EOR method and an oil displacement agent, which are used for improving the crude oil recovery effect by simply using carbon dioxide for oil displacement in comparison with the prior art, and have poor carbon dioxide burying stability, and by adopting the technical scheme, a stable nanofluid is formed by mixing a nano MOFs material with oilfield injection water, and CO 2 Adsorption to MOFs nanofluids to form CO 2 -MOFs nanofluid. By CO 2 MOFs nano fluid increases sweep volume, eliminates gas channeling and realizes CO 2 And the high-efficiency synergy with the MOFs material for improving the recovery mechanism obviously improves the crude oil recovery. And, CO 2 Is adsorbed on MOFs material, injected into reservoir in adsorption state, and has higher buried stability than free CO 2 Better. By adopting the technical scheme, the improvement of the crude oil recovery ratio and the carbon sequestration efficiency is realized at the same time, and the emission reduction benefits of carbon dioxide capture, oil displacement and sequestration are further improved.
Description
Technical Field
The application relates to the technical field of oil displacement, in particular to an integrated CCUS-EOR method and an oil displacement agent.
Background
The carbon dioxide trapping, oil displacement and burying (CCUS-EOR) has the dual benefits of greatly improving the recovery ratio of crude oil and burying carbon for reducing emission, and is a practical and feasible technical means for realizing carbon neutralization at present. The CCUS-EOR injects the captured carbon dioxide into the developed oil reservoir with complete geological structure, good sealing performance and detailed basic data, improves the recovery ratio of crude oil by displacement and realizes the carbon dioxide burying, thereby being the CCUS technology with the maximum application standard at present and having wide application prospect.
However, because of the density and viscosity difference of the carbon dioxide and the crude oil, gas channeling is very easy to occur in the carbon dioxide oil displacement process, so that the swept volume is reduced, and the effect of improving the recovery ratio of the crude oil is affected. In addition, after carbon dioxide is injected into a reservoir in a free state, a considerable part of carbon dioxide exists in a free state for a long time, leakage is easy to occur, and the buried stability is poor.
Therefore, how to achieve the improvement of the recovery ratio of crude oil and the carbon sequestration efficiency at the same time and further improve the emission reduction benefits of carbon dioxide capture, oil displacement and sequestration is a problem to be solved by the technicians in the field.
Disclosure of Invention
The purpose of the application is to provide an integrated CCUS-EOR method and an oil displacement agent, which are used for simultaneously improving the recovery ratio of crude oil and the carbon sequestration efficiency and further improving the emission reduction benefits of carbon dioxide capture, oil displacement and sequestration.
In order to solve the above technical problems, the present application provides an integrated CCUS-EOR method, comprising:
mixing nano metal organic framework compound solid particles with oilfield injection water according to a preset proportion to obtain MOFs nano fluid;
contacting carbon dioxide with MOFs nanofluids to form CO 2 -MOFs nanofluids;
CO is processed by 2 -MOFs nanofluid is injected into the reservoir to effect flooding.
Preferably, the solid particles of the nano metal organic framework compound are ZIF-8 particles with the mass fraction of 0.06%.
Preferably, the preparation process of the ZIF-8 particles comprises the following steps: one part of zinc nitrate hexahydrate is dissolved in 7 parts of deionized water, and the other 30 parts of 2-methylimidazole is dissolved in 60 parts of deionized water, the two are mixed and stirred for 30 minutes at 60 ℃, then the suspension is centrifuged for 20 minutes at 10000rpm to obtain a product, the product is washed three times by the deionized water, and the product is put into a 60 ℃ oven for drying, so as to obtain ZIF-8 particles.
Preferably, the mixing the solid particles of the nano metal organic framework compound with the oilfield injection water according to a preset proportion to form the MOFs nano fluid comprises the following steps: adding ZIF-8 particles into oilfield injection water at a mass fraction of 0.06%, stirring for 6 hours by using a magnetic stirrer, transferring into a sealed glass bottle, and dispersing for 3 hours by using ultrasonic waves to obtain the stable ZIF-8 nanofluid.
Preferably, CO 2 The manufacturing process of the MOFs nanofluid comprises the following steps: carbon capture using a spray tower, spraying MOFs nanofluid from the top of the spray tower, carbon dioxide entering from the bottom of the spray tower, and contacting the carbon dioxide with the sprayed MOFs nanofluid to form CO 2 -MOFs nanofluid.
Preferably, the method further comprises: detecting the carbon dioxide flow change of the air inlet end and the air outlet end of the spray tower, and considering the formation of CO when the flow is consistent and stable 2 -MOFs nanofluid.
Preferably, the carbon dioxide is carbon dioxide in industrial tail gas.
Preferably, the oilfield injection water is formation water of a reservoir.
Preferably, the said method comprises the step of mixing CO 2 -MOFs nanofluid injection into reservoirs to effect flooding includes:
using formation water to inject oil reservoir for displacement to oil-free output, and then injecting CO 2 -MOFs nanofluid continued displacement.
In order to solve the technical problem, the application also provides an oil displacement agent, which comprises: mixing solid particles of nano metal organic framework compound with oilfield injection water according to a preset proportion to form MOFs nano fluid, and then contacting with carbon dioxide to form CO 2 -MOFs nanofluid.
The integrated CCUS-EOR method provided by the application comprises the steps of organically forming a nano metal skeletonMixing the compound solid particles with oilfield injection water according to a preset proportion to obtain MOFs nano-fluid; contacting carbon dioxide with MOFs nanofluids to form CO 2 -MOFs nanofluids; CO is processed by 2 -MOFs nanofluid is injected into the reservoir to effect flooding. Compared with the prior art, the method has the advantages that the effect of improving the crude oil recovery ratio is affected by simply using the carbon dioxide for oil displacement, the burying stability of the carbon dioxide is poor, the nano material is utilized to adsorb CO by virtue of the advantages of small size, large specific surface area, surface activity and the like of the nano material, and the MOFs material is combined 2 Is characterized in that the nanometer MOFs material is mixed with the oilfield injection water to form stable nanometer fluid, CO 2 Adsorption to MOFs nanofluids to form CO 2 -MOFs nanofluid. By CO 2 MOFs nano fluid increases sweep volume, eliminates gas channeling and realizes CO 2 And the high-efficiency synergy with the MOFs material for improving the recovery mechanism obviously improves the crude oil recovery. And, CO 2 Is adsorbed on MOFs material, injected into reservoir in adsorption state, and has higher buried stability than free CO 2 Better. By adopting the technical scheme, the improvement of the crude oil recovery ratio and the carbon sequestration efficiency is realized at the same time, and the emission reduction benefits of carbon dioxide capture, oil displacement and sequestration are further improved.
In addition, the oil displacement agent provided by the application comprises CO formed by mixing solid particles of nano metal organic framework compound and oilfield injection water according to a preset proportion to form MOFs nano fluid and then contacting the MOFs nano fluid with carbon dioxide 2 -MOFs nanofluid. By adopting the technical scheme, the nano material has the advantages of small size, large specific surface area, surface activity and the like by virtue of the small size, and is combined with the MOFs material to adsorb CO 2 Is characterized in that the nanometer MOFs material is mixed with the oilfield injection water to form stable nanometer fluid, CO 2 Adsorption to MOFs nanofluids to form CO 2 -MOFs nanofluid. By CO 2 MOFs nano fluid increases sweep volume, eliminates gas channeling and realizes CO 2 And the high-efficiency synergy with the MOFs material for improving the recovery mechanism obviously improves the crude oil recovery. And, CO 2 Is adsorbed on MOFs material, injected into reservoir in adsorption state, and has higher buried stability than free CO 2 Better. By adopting the technical scheme, the crude oil is simultaneously realizedAnd the recovery ratio and the carbon burying efficiency are improved, and the emission reduction benefits of carbon dioxide trapping, oil displacement and burying are further improved.
Drawings
For a clearer description of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described, it being apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of an integrated CCUS-EOR method provided in an embodiment of the present application;
FIG. 2 is a microscopic morphology of the prepared nano ZIF-8 particles according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a ZIF-8 nanofluid outlet end CO according to an embodiment of the present application 2 A flow rate variation curve with time;
FIG. 4 is a schematic diagram of an oil displacement process according to an embodiment of the present disclosure;
FIG. 5 (a) is a graph of formation water improvement effect;
FIG. 5 (b) is a graph showing the effect of ZIF-8 nanofluid improvement;
FIG. 5 (c) is CO 2 -ZIF-8 nanofluid improvement effect profile;
FIG. 6 (a) is a graph of ZIF-8 nanofluid extraction according to an example of the present application;
FIG. 6 (b) is a schematic illustration of a CO according to an embodiment of the present application 2 -ZIF-8 nanofluid recovery profile.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments herein without making any inventive effort are intended to fall within the scope of the present application.
The carbon dioxide trapping, oil displacement and burying (CCUS-EOR) has the dual benefits of greatly improving the recovery ratio of crude oil and burying carbon for reducing emission, and is a practical and feasible technical means for realizing carbon neutralization at present. The CCUS-EOR injects the captured carbon dioxide into the developed oil reservoir with complete geological structure, good sealing performance and detailed basic data, improves the recovery ratio of crude oil by displacement and realizes the carbon dioxide burying, thereby being the CCUS technology with the maximum application standard at present and having wide application prospect. In the prior art, a physical or chemical adsorption separation method is generally adopted to trap CO2 in tail gas discharged from industrial devices such as coal and electricity, cement, steel, building materials, refining and the like, the CO2 is transported to an oil field in a vehicle-mounted or pipeline mode, and the CO2 is injected into an oil reservoir in a gaseous state or supercritical state through an injection well to drive oil so as to realize the burying and the improvement of the crude oil recovery ratio.
However, because of the density and viscosity difference of the carbon dioxide and the crude oil, gas channeling is very easy to occur in the carbon dioxide oil displacement process, so that the swept volume is reduced, and the effect of improving the recovery ratio of the crude oil is affected. In addition, after carbon dioxide is injected into a reservoir in a free state, a considerable part of carbon dioxide exists in a free state for a long time, leakage is easy to occur, and the buried stability is poor.
Therefore, how to achieve the improvement of the recovery ratio of crude oil and the carbon sequestration efficiency at the same time and further improve the emission reduction benefits of carbon dioxide capture, oil displacement and sequestration is a problem to be solved by the technicians in the field.
The core of the application is to provide an integrated CCUS-EOR method and an oil displacement agent, which are used for simultaneously improving the recovery ratio of crude oil and the carbon sequestration efficiency and further improving the emission reduction benefits of carbon dioxide capture, oil displacement and sequestration.
In order to provide a better understanding of the present application, those skilled in the art will now make further details of the present application with reference to the drawings and detailed description.
Fig. 1 is a flowchart of an integrated CCUS-EOR method according to an embodiment of the present application, as shown in fig. 1, where the method includes:
s10: mixing nano metal organic framework compound solid particles with oilfield injection water according to a preset proportion to obtain MOFs nano fluid;
s11: will be oxidizedCarbon and MOFs nanofluidic contact to form CO 2 -MOFs nanofluids;
s12: CO is processed by 2 -MOFs nanofluid is injected into the reservoir to effect flooding.
The metal organic framework compound (Metal organic Framework, MOFs) material is a crystalline porous material with a periodic network structure, which is formed by connecting an inorganic metal center (metal ions or metal clusters) and a bridged organic ligand through self-assembly, and can be subjected to directional design to realize the chemical regulation and control of dimension, spatial configuration, surface and interface. MOFs are organic-inorganic hybrid materials, also known as coordination polymers, which differ from inorganic porous materials, as well as from general organic complexes. Has both the rigidity of inorganic materials and the flexibility of organic materials. So that the material has great development potential and attractive development prospect in the aspect of current material research. Based on these advantages, especially in CO 2 In terms of adsorption separation, MOFs exhibit great potential for use.
Whereas nanomaterials refer to materials that are at least one-dimensional in three dimensions in the nanoscale (1-100 nm) or that are made up of them as basic units, which corresponds approximately to the scale of 10-1000 atoms closely spaced together. Nanoparticles tend to have a very large specific surface area, which can reach hundreds or even thousands of square meters per gram of such solids, making them useful as highly active adsorbents and catalysts.
Therefore, based on the above characteristics, in this embodiment, after solid particles of the nano metal organic framework compound are mixed with oilfield injection water according to a predetermined ratio to form MOFs nanofluid, carbon dioxide is adsorbed to the MOFs nanofluid to form CO 2 -MOFs nanofluid. CO 2 Is adsorbed on MOFs material, injected into reservoir in adsorption state, and has higher buried stability than free CO 2 Better. And by CO 2 MOFs nano fluid increases sweep volume, eliminates gas channeling and realizes CO 2 The high-efficiency synergy with the MOFs material for improving the recovery mechanism can obviously improve the crude oil recovery.
The integrated CCUS-EOR method provided by the application comprises the steps of organically binding nano metalMixing the solid particles of the scaffold compound with oilfield injection water according to a preset proportion to obtain MOFs nano-fluid; contacting carbon dioxide with MOFs nanofluids to form CO 2 -MOFs nanofluids; CO is processed by 2 -MOFs nanofluid is injected into the reservoir to effect flooding. Compared with the prior art, the method has the advantages that the effect of improving the crude oil recovery ratio is affected by simply using the carbon dioxide for oil displacement, the burying stability of the carbon dioxide is poor, the nano material is utilized to adsorb CO by virtue of the advantages of small size, large specific surface area, surface activity and the like of the nano material, and the MOFs material is combined 2 Is characterized in that the nanometer MOFs material is mixed with the oilfield injection water to form stable nanometer fluid, CO 2 Adsorption to MOFs nanofluids to form CO 2 -MOFs nanofluid. By CO 2 MOFs nano fluid increases sweep volume, eliminates gas channeling and realizes CO 2 And the high-efficiency synergy with the MOFs material for improving the recovery mechanism obviously improves the crude oil recovery. And, CO 2 Is adsorbed on MOFs material, injected into reservoir in adsorption state, and has higher buried stability than free CO 2 Better. By adopting the technical scheme, the improvement of the crude oil recovery ratio and the carbon sequestration efficiency is realized at the same time, and the emission reduction benefits of carbon dioxide capture, oil displacement and sequestration are further improved.
In a specific implementation, the solid particles of the nano metal organic framework compound can adopt ZIF-8 particles with the mass fraction of 0.06%. The zeolite imidazole ester framework structure (Zeolitic Imidazolate Frameworks, ZIFs) is an important subclass in metal organic framework Materials (MOFs), has a structure similar to that of aluminosilicate zeolite materials, combines the advantages of zeolite and MOFs, and has high thermal stability, chemical stability, high specific surface area and high pore volume. ZIF-8 is an ordered porous material formed by the coordination bond connection of metallic zinc ions and 2-methylimidazole. ZIF-8 has high hydrophobicity, chemical stability and thermal stability, and has wide application value.
The embodiment also provides a specific method for manufacturing ZIF-8 particles, in which the manufacturing process of the ZIF-8 particles includes: one part of zinc nitrate hexahydrate is dissolved in 7 parts of deionized water, and the other 30 parts of 2-methylimidazole is dissolved in 60 parts of deionized water, the two are mixed and stirred for 30 minutes at 60 ℃, then the suspension is centrifuged for 20 minutes at 10000rpm to obtain a product, the product is washed three times by the deionized water, and the product is put into a 60 ℃ oven for drying, so as to obtain ZIF-8 particles. FIG. 2 is a microscopic morphology of the prepared nano ZIF-8 particles according to the embodiment of the present application.
Further, mixing the nano metal organic framework compound solid particles with oilfield injection water according to a preset proportion to form MOFs nano fluid comprises the following steps: adding ZIF-8 particles into oilfield injection water at a mass fraction of 0.06%, stirring for 6 hours by using a magnetic stirrer, transferring into a sealed glass bottle, and dispersing for 3 hours by using ultrasonic waves to obtain the stable ZIF-8 nanofluid.
In a specific implementation, the oilfield injection water is formation water of a reservoir. It will be appreciated that the formation water of the oil reservoir is used as the oil field injection water in order to achieve a better displacement effect, as the material contained in the formation water of the oil reservoir is different for different oil reservoirs.
And then through CO capture 2 CO formation 2 -MOFs nanofluid to be transported to an oilfield distribution station via pipeline or tank car. CO is distributed in oil field water distribution station 2 The MOFs nano fluid is injected into the oil reservoir through the water injection well, and residual oil output in the oil reservoir is promoted through mechanisms such as reducing oil-water interfacial tension, improving rock surface wettability and the like, so that the crude oil recovery ratio is improved.
In particular, in order to capture, displace and embed carbon dioxide, it is necessary to use physical or chemical adsorption separation method to carry out CO on the tail gas discharged from industrial devices such as coal and electricity, cement, steel, building materials, refining and the like 2 Trapping, plant trapping CO 2 After that, CO is often required to be heated and the like 2 This process requires additional energy to separate, increasing the trapping costs.
In this application, since MOFs are fused to oilfield injection water to form MOFs nanofluids, which have good adsorption of carbon dioxide, in this example, CO 2 The manufacturing process of the MOFs nanofluid comprises the following steps: carbon trapping with spray tower, spraying MOFs nanometer fluid from the top of the spray tower, carbon dioxide entering from the bottom of the spray tower, carbon dioxide and sprayed MOFs nanofluidic contact to become CO 2 -MOFs nanofluid. In this embodiment, the carbon dioxide is carbon dioxide in the industrial tail gas, the industrial tail gas is directly connected to the spray tower, and the carbon dioxide is separated in a mode of heating the industrial tail gas or the like, so that compared with other gases in the industrial tail gas such as hydrogen sulfide, fluoride and the like, the carbon dioxide has stronger capacity of adsorbing nanofluid, and the carbon dioxide in the industrial tail gas can be adsorbed on MOFs nanofluid, thereby reducing trapping cost.
And the CO can be formed by detecting the carbon dioxide flow changes of the air inlet end and the air outlet end of the spray tower when the flow is consistent and stable 2 -MOFs nanofluid.
FIG. 3 is a schematic diagram of a ZIF-8 nanofluid outlet end CO according to an embodiment of the present application 2 Flow rate versus time. When MOFs are ZIF-8, the ZIF-8 nanofluid is considered to saturate CO when the inlet end flow is unchanged and the outlet end flow is stable 2 Gas, CO formation 2 -ZIF-8 nanofluid.
In summary, fig. 4 is a schematic diagram of an oil displacement process provided in the embodiment of the present application, and as a preferred scheme, nano MOFs solid particles and oilfield injection water are uniformly mixed according to a certain proportion to form a nano fluid. Industrial tail gas carbon trapping by using a spray tower, spraying MOFs nano-fluid from the top of the tower body, allowing the factory tail gas to enter from the bottom of the tower body, contacting with the MOFs nano-fluid sprayed by the spray tower, and trapping high-concentration CO in the factory tail gas 2 . CO capture 2 The MOFs nano-fluid becomes CO 2 -MOFs nanofluid to be transported to an oilfield distribution station via pipeline or tank car. CO is distributed in oil field water distribution station 2 The MOFs nano fluid is injected into the oil reservoir through the water injection well, and residual oil output in the oil reservoir is promoted through mechanisms such as reducing oil-water interfacial tension, improving rock surface wettability and the like, so that the crude oil recovery ratio is improved.
In particular implementations, to reduce costs, formation water may be injected into the reservoir to displace to oil-free production prior to CO injection 2 -MOFs nanofluid continued displacement.
To verify CO 2 The oil displacement effect of MOFs nano-fluid,the embodiment also provides a specific verification result. Wherein the simulated oil is the oil field degassing crude oil of Bohai sea and kerosene 1:2, preparing.
Application of nanofluids obtained by the method of the present application to displacement processes, CO 2 The interfacial tension between oil and water is reduced from 19.92mN/m to 8.03mN/m by the ZIF-8 nano fluid, 59.69 percent is reduced, and if the ZIF-8 nano fluid is adopted, the interfacial tension can be reduced to 12.12mN/m, thus the CO can be seen 2 Compared with the traditional nano oil displacement agent, the ZIF-8 nano fluid has more remarkable effect of improving the interfacial tension. By CO 2 The wetting angle of the core is reduced from 110 degrees to 74 degrees, the rock surface is changed from oil humidity to water humidity, and meanwhile, compared with the ZIF-8 nano fluid, the improvement effect is improved. FIG. 5 is a graph showing comparative effects of nanofluid on improving core wettability angle, FIG. 5 (a) is a graph showing effects of improving formation water, FIG. 5 (b) is a graph showing effects of ZIF-8 nanofluid improvement, and FIG. 5 (c) is CO 2 -ZIF-8 nanofluid improvement effect graph.
In the experiment, the formation water is firstly used for displacement until oil-free output is achieved, then the nano fluid is injected for continuous displacement, fig. 6 (a) is a graph of the extraction degree of ZIF-8 nano fluid provided by the embodiment of the application, and fig. 6 (b) is a graph of the extraction degree of CO provided by the embodiment of the application 2 -ZIF-8 nanofluid recovery profile. It can be seen that the final recovery level can be increased by 6.98% with ZIF-8 nanofluid, and CO 2 The final recovery of the ZIF-8 nanofluid can be improved by 12.79 percent, and CO can be seen 2 The ZIF-8 nano fluid has very remarkable recovery efficiency improvement effect.
In addition, the application also provides an oil displacement agent, which comprises: mixing solid particles of nano metal organic framework compound with oilfield injection water according to a preset proportion to form MOFs nano fluid, and then contacting with carbon dioxide to form CO 2 -MOFs nanofluid.
The oil displacement agent provided by the application utilizes the advantages of small size, large specific surface area, surface activity and the like of the nano material, and combines MOFs material to adsorb CO 2 Is characterized in that the nanometer MOFs material is mixed with the oilfield injection water to form stable nanometer fluid, CO 2 Adsorbed to MOFs nanofluidsCO formation 2 -MOFs nanofluid. By CO 2 MOFs nano fluid increases sweep volume, eliminates gas channeling and realizes CO 2 And the high-efficiency synergy with the MOFs material for improving the recovery mechanism obviously improves the crude oil recovery. And, CO 2 Is adsorbed on MOFs material, injected into reservoir in adsorption state, and has higher buried stability than free CO 2 Better. By adopting the technical scheme, the improvement of the crude oil recovery ratio and the carbon sequestration efficiency is realized at the same time, and the emission reduction benefits of carbon dioxide capture, oil displacement and sequestration are further improved.
The integrated CCUS-EOR method and the oil displacement agent provided by the application are described in detail above. In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section. It should be noted that it would be obvious to those skilled in the art that various improvements and modifications can be made to the present application without departing from the principles of the present application, and such improvements and modifications fall within the scope of the claims of the present application.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. An integrated CCUS-EOR method, comprising:
mixing nano metal organic framework compound solid particles with oilfield injection water according to a preset proportion to obtain MOFs nano fluid;
contacting carbon dioxide with MOFs nanofluids to form CO 2 -MOFs nanofluids;
CO is processed by 2 -MOFs nanofluid is injected into the reservoir to effect flooding.
2. The integrated CCUS-EOR process of claim 1, wherein the solid particles of the nano-metal-organic framework compound are 0.06% by mass ZIF-8 particles.
3. The integrated CCUS-EOR process of claim 2, wherein the ZIF-8 particle is produced by a process comprising: one part of zinc nitrate hexahydrate is dissolved in 7 parts of deionized water, and the other 30 parts of 2-methylimidazole is dissolved in 60 parts of deionized water, the two are mixed and stirred for 30 minutes at 60 ℃, then the suspension is centrifuged for 20 minutes at 10000rpm to obtain a product, the product is washed three times by the deionized water, and the product is put into a 60 ℃ oven for drying, so as to obtain ZIF-8 particles.
4. The integrated CCUS-EOR process of claim 3, wherein mixing the solid particles of the nano-metal-organic framework compound with the oilfield injection water in a predetermined ratio to form MOFs nanofluid comprises: adding ZIF-8 particles into oilfield injection water at a mass fraction of 0.06%, stirring for 6 hours by using a magnetic stirrer, transferring into a sealed glass bottle, and dispersing for 3 hours by using ultrasonic waves to obtain the stable ZIF-8 nanofluid.
5. The integrated CCUS-EOR process of claim 1, wherein CO 2 The manufacturing process of the MOFs nanofluid comprises the following steps: carbon capture is carried out by using a spray tower, MOFs nanofluid is sprayed out from the top of the spray tower, and carbon dioxide is sprayed out from the top of the spray towerEntering from the bottom of the spray tower, carbon dioxide contacts with the ejected MOFs nanofluid to become CO 2 -MOFs nanofluid.
6. The integrated CCUS-EOR process of claim 5, further comprising: detecting the carbon dioxide flow change of the air inlet end and the air outlet end of the spray tower, and considering the formation of CO when the flow is consistent and stable 2 -MOFs nanofluid.
7. The integrated CCUS-EOR process of claim 5, wherein the carbon dioxide is carbon dioxide in an industrial tail gas.
8. The integrated CCUS-EOR process of claim 4, wherein the oilfield injection water is formation water of a reservoir.
9. The integrated CCUS-EOR process of any one of claims 1 to 8, wherein said CO is CO 2 -MOFs nanofluid injection into reservoirs to effect flooding includes:
using formation water to inject oil reservoir for displacement to oil-free output, and then injecting CO 2 -MOFs nanofluid continued displacement.
10. An oil displacement agent, comprising: mixing solid particles of nano metal organic framework compound with oilfield injection water according to a preset proportion to form MOFs nano fluid, and then contacting with carbon dioxide to form CO 2 -MOFs nanofluid.
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