CN113563859A - Use of carbon-rich fluids for enhanced oil recovery - Google Patents

Use of carbon-rich fluids for enhanced oil recovery Download PDF

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CN113563859A
CN113563859A CN202110804340.XA CN202110804340A CN113563859A CN 113563859 A CN113563859 A CN 113563859A CN 202110804340 A CN202110804340 A CN 202110804340A CN 113563859 A CN113563859 A CN 113563859A
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carbon
rich fluid
carbon dioxide
oil
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CN113563859B (en
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柳沛丰
刘磊
周晓寒
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Jinan Yage New Material Technology Co ltd
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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
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/607—Compositions for stimulating production by acting on the underground formation specially adapted for clay formations
    • 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
    • C08G83/002—Dendritic macromolecules
    • C08G83/005—Hyperbranched macromolecules
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    • 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
    • C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
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    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/607—Compositions for stimulating production by acting on the underground formation specially adapted for clay formations
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    • C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
    • C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
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Abstract

The invention discloses an application of a carbon-rich fluid in improving the oil recovery ratio, and mainly relates to an application of the carbon-rich fluid in inhibiting clay swelling, an application of the carbon-rich fluid in preparing a clay stabilizer, an application of the carbon-rich fluid in oil displacement and an application of the carbon-rich fluid in preparing an oil displacement agent. The carbon-rich fluid is obtained after the hyperbranched polyamine carbon dioxide absorbent absorbs carbon dioxide. Preparing a carbon-rich fluid solution with the mass concentration of 0.5-5% by using the carbon-rich fluid and water to obtain a clay stabilizer; the mass concentration ratio of the carbon-rich fluid to the oil displacing polymer is 1: (1-3) mixing to obtain the oil displacement agent. The carbon-rich fluid has high quaternary ammonium cation density and a dendritic structure, can act with clay minerals to inhibit clay expansion, and can improve the oil displacement effect of polymers; the recovery ratio of petroleum is improved, and carbon fixation and emission reduction are realized.

Description

Use of carbon-rich fluids for enhanced oil recovery
Technical Field
The invention relates to the technical field of CCUS, in particular to application of a carbon-rich fluid in improving oil recovery.
Background
Most oil fields in China enter the middle and later stages of development at the present stage, the comprehensive water content of some oil fields exceeds 90%, the oil field reserves are reduced, and the yield is reduced in the current situation of successive years. The water injection development is to inject water into the oil reservoir to recover the pressure of the oil reservoir, so that the exploitation efficiency of the oil field is improved. The produced water quantity of the oil field is huge, the oil field needs to be reinjected after treatment, and a series of oil field chemical agents can be added according to the requirement of the oil reservoir on water quality in the period.
Among the many factors that cause damage to hydrocarbon reservoirs, damage to clay minerals is one of its major factors. The clay minerals mainly comprise montmorillonite, kaolinite, illite (hydromica), chlorite, illite mixed layer, smectite mixed layer and the like, and the damage of the clay minerals to the oil-gas layer is mainly represented by two modes of expansion and migration. The damage mode of the water-sensitive clay minerals (such as montmorillonite, illite, chlorite and the like) to the stratum is mainly hydration expansion plugging, and the damage mode of the non-water-sensitive clay minerals (such as kaolinite, illite and the like) to the stratum is mainly particle migration plugging. In order to protect the permeability of a hydrocarbon reservoir, a clay stabilizer with excellent performance is added into various water-based working fluids, and the inhibition of the damage of the clay to the hydrocarbon reservoir is one of the current economic and effective measures for protecting the hydrocarbon reservoir. The clay stabilizer can effectively inhibit the expansion of clay and can better control the migration of particles.
The carbon-rich fluid being CO2Absorbent with CO2The solution formed after the reaction. The carbon-rich fluid is a neutral aqueous solution after low-temperature reaction, is not corroded, is very convenient to store, transport and use, is injected along with an oilfield water injection system, does not need equipment transformation and extra investment, is simple and convenient to operate, and is a brand-new CCUS technology. Therefore, a carbon-rich fluid is needed, which has high quaternary ammonium cation density and a dendritic structure, can not only react with clay minerals to inhibit clay expansion, but also improve the oil displacement effect of polymers; the recovery ratio of petroleum is improved, and carbon fixation and emission reduction are realized.
Disclosure of Invention
In view of the above prior art, it is an object of the present invention to provide the use of carbon-rich fluids for enhanced oil recovery. The carbon-rich fluid has high quaternary ammonium cation density and a dendritic structure, can act with clay minerals to inhibit clay expansion, and can improve the oil displacement effect of polymers; the recovery ratio of petroleum is improved, and carbon fixation and emission reduction are realized.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect of the invention, there is provided the use of a carbon-rich fluid in 1) or 2) as follows:
1) inhibiting clay swelling;
2) preparing a clay stabilizer.
Preferably, the carbon-rich fluid is obtained after carbon dioxide is absorbed by the hyperbranched polyamine carbon dioxide absorbent.
Preferably, the structural formula of the hyperbranched polyamine carbon dioxide absorbent has a repeating structural unit of-A-C-or-B-C-, and the structural formula of A, B, C is as follows:
Figure BDA0003165837290000021
R1,R2,R3,R4each independently represents-Ar-or C1-C8 unsubstituted or substituted alkyl, wherein Ar is a divalent aromatic group; n is 0 to 4.
According to a second aspect of the invention, a clay stabilizer is provided, wherein the clay stabilizer is a carbon-rich fluid solution which is prepared from a carbon-rich fluid and water and has a mass concentration of 0.5-5%.
Preferably, the carbon-rich fluid is obtained by absorbing carbon dioxide by using a hyperbranched polyamine carbon dioxide absorbent;
preferably, the structural formula of the hyperbranched polyamine carbon dioxide absorbent has a repeating structural unit of-A-C-or-B-C-, and the structural formula of A, B, C is as follows:
Figure BDA0003165837290000022
R1,R2,R3,R4each independently represents-Ar-or C1-C8 unsubstituted or substituted alkyl, wherein Ar is a divalent aromatic group; n is 0 to 4. .
In a third aspect of the invention, there is provided the use of a carbon-rich fluid in 1) or 2) as follows:
1) oil displacement;
2) and (4) preparing an oil displacement agent.
Preferably, the carbon-rich fluid is obtained after carbon dioxide is absorbed by the hyperbranched polyamine carbon dioxide absorbent.
Preferably, the structural formula of the hyperbranched polyamine carbon dioxide absorbent has a repeating structural unit of-A-C-or-B-C-, and the structural formula of A, B, C is as follows:
Figure BDA0003165837290000031
R1,R2,R3,R4each independently represents-Ar-or C1-C8 unsubstituted or substituted alkyl, wherein Ar is a divalent aromatic group; n is 0 to 4.
In a fourth aspect of the present invention, there is provided an oil-displacing agent comprising:
the mass concentration ratio of the carbon-rich fluid to the flooding polymer is 1: (1-3).
Preferably, the carbon-rich fluid is obtained by absorbing carbon dioxide by using a hyperbranched polyamine carbon dioxide absorbent;
preferably, the structural formula of the hyperbranched polyamine carbon dioxide absorbent has a repeating structural unit of-A-C-or-B-C-, and the structural formula of A, B, C is as follows:
Figure BDA0003165837290000032
R1,R2,R3,R4each independently represents-Ar-or C1-C8 unsubstituted or substituted alkyl, wherein Ar is a divalent aromatic group; n is 0-4;
preferably, the flooding polymer is polyacrylamide.
The hyperbranched polyamine carbon dioxide absorbent with the repeating structural unit of-A-C-is prepared by the following method:
1) in an organic solvent, pentaerythritol reacts with phosphorus tribromide to obtain tetrabromo-pentaerythritol:
Figure BDA0003165837290000033
2) in an organic solvent, tetrabromo-pentaerythritol reacts with a compound with a general formula P1 under the action of alkali to obtain a compound with a structural formula A, wherein R and R in the general formula P11、R2、R3、R4The expression ranges of (c) are consistent:
Figure BDA0003165837290000041
3) in an organic solvent, obtaining the hyperbranched polyamine carbon dioxide absorbent- (A-C) with-A-C-repetitive structural unit by the compound with the structural formula A and the compound with the structural formula C under the action of a reducing agentn-：
Figure BDA0003165837290000042
The hyperbranched polyamine carbon dioxide absorbent with the repeating structural unit of-B-C-is prepared by the following method:
1) in an organic solvent, glycerol reacts with phosphorus tribromide to obtain tribromoglycerol:
Figure BDA0003165837290000043
2) in an organic solvent, tribromoglycerol reacts with a compound with a general formula P1 under the action of alkali to obtain a compound with a structural formula B, wherein R and R in the general formula P11、R2、R3、R4The expression ranges of (c) are consistent:
Figure BDA0003165837290000044
3) in an organic solvent, under the action of a reducing agent, the compound with the structural formula B and the compound with the structural formula C obtain a hyperbranched polyamine carbon dioxide absorbent- (B-C) with a-B-C-repeating structural unitn-：
Figure BDA0003165837290000051
The invention has the beneficial effects that:
(1) the carbon-rich fluid is obtained after the hyperbranched polyamine absorbent absorbs carbon dioxide, can be used for improving the recovery ratio of petroleum, and has very important theoretical and practical significance for carbon neutralization and carbon emission reduction.
(2) The carbon-rich fluid of the invention realizes the improvement of oil recovery from two aspects: on one hand, the carbon-rich fluid is prepared into a carbon-rich fluid solution with the mass concentration of 0.5-5%, the carbon-rich fluid solution can be used as a clay stabilizer, and the water injection effect is improved by inhibiting the clay from expanding and opening an oil path; on the other hand, the carbon-rich fluid can be used as a high-efficiency oil displacement agent for tertiary recovery of petroleum by matching with an oil displacement polymer, so that the recovery rate of the petroleum is improved.
Drawings
FIG. 1: the oil displacement agents prepared in the embodiments 8 to 11 and the comparative examples have oil displacement effects, and the number 1 in the figure is the comparative example: 2500 ppmHPAM; number 2 is oil-displacing agent 3 prepared in example 10; number 3 is oil-displacing agent 1 prepared in example 8; number 4 is oil-displacing agent 4 prepared in example 11; number 5 corresponds to oil-displacing agent 2 prepared in example 9.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the technical solutions of the present application will be described in detail below with reference to specific embodiments.
The test materials used in the examples of the present invention are all conventional in the art and commercially available.
Example 1
Preparation of carbon-rich stream P4-1:
(1) a repeating unit of the formula-A-C-, and R1＝R2＝R3＝R4＝
Figure BDA0003165837290000052
Preparation of compound P4-1 with n-2;
the structural formula of P4-1 is:
Figure BDA0003165837290000061
1) pentaerythritol (13.6g, 0.1mol) was dissolved in dry N, N-dimethylformamide (200mL) and phosphorus tribromide (133g, 0.5mol) was added in portions at 25 ℃. After stirring for 20 minutes, the temperature was slowly raised to 125 ℃ for 12 hours. After completion of the reaction, the reaction mixture was poured into ice water (500mL), and sodium hydroxide solution (0.2mol L) was added-1) The pH was adjusted to 8 and the residue was suction filtered to give tetrabromobisphenol (24.6g, 64%).1H NMR(CDCl3,400MHz):δ3.20(s,8H).13C NMR(CDCl3,100MHz):δ146.1,37.9.HR-MS(MALDI):m/z[M]+cacld for C5H8Br4,383.7860；found,387.7319.
2) Tetrabromoquaternary amyl alcohol (19.2g, 0.05mol) prepared in step 1), 4-hydroxybenzaldehyde (26.8g, 0.220mol), and potassium carbonate (41.4g, 0.30mol) were added to N, N-dimethylformamide (250mL) and the temperature was raised to 100 ℃ for reaction for 16 hours. The reaction was poured into ice water (500mL) and the residue was suction filtered to give intermediate A-1(22.9g, 83%).1H NMR(CDCl3,400MHz):δ3.82(s,8H),7.17(d,J＝8.0Hz,8H),7.78(d,J＝8.0Hz,8H),10.02(s,4H).13C NMR(CDCl3,100MHz):δ191.11,165.23,131.92,128.56,114.97,61.23,40.26.HR-MS(MALDI):m/z[M]+cacld for C33H28O8,552.1784；found,553.1790.
3) The intermediate a-1(27.6g, 0.05mol) prepared in step 2) and C-1(n ═ 2) triethylene tetramine (14.6g, 0.10mol) were added to methanol (100mL), and sodium borohydride (7.6g,0.20mol) was added slowly in portions at 0 to 10 ℃. After the addition, the reaction mixture was warmed to room temperature and reacted for 5 hours. The solvent was distilled off under reduced pressure, and the residue was dissolved in chloroform and filtered. The filtrate was distilled off under reduced pressure to give hyperbranched polyamine P4-1(33.4g, 86%).1H NMR(CDCl3,400MHz):δ2.52-2.66(m,48H),3.74(s,8H),3.80(s,8H),7.12(d,J＝8.0Hz,8H),7.54(d,J＝8.0Hz,8H).13C NMR(CDCl3,100MHz):δ157.71,156.63,131.82,130.26,127.17,114.20,61.23,52.33,51.20,49.12,48.25,41.26.
(2) And (3) introducing carbon dioxide gas into the compound P4-1 at normal temperature, and obtaining a carbon-rich fluid P4-1 when the pH value of the compound P4-1 is about 7.5.
Example 2
Preparation of carbon-rich stream P6-1:
(1) having the formula-B-C-repeating unit, and R1 ═ R2 ═ R3 ═ R4 ═ C
Figure BDA0003165837290000071
Preparation of compound P6-1 with n-2
The structural formula of P6-1 is:
Figure BDA0003165837290000072
1) glycerol (9.2g, 0.1mol) was dissolved in dry N, N-dimethylformamide (200mL) and phosphorus tribromide (106.4g, 0.4mol) was added in portions at 25 ℃. After stirring for 20 minutes, the temperature was slowly raised to 120 ℃ for 12 hours. After completion of the reaction, the reaction mixture was poured into ice water (500mL), and sodium hydroxide solution (0.2mol L) was added-1) The pH was adjusted to 8 and the residue was suction filtered to give tribromoglycerol (17.6g, 63%).1H NMR(CDCl3,400MHz):δ4.60-4.65(m,1H),3.74(d,J＝8.0Hz 4H).13C NMR(CDCl3,100MHz):δ48.9,34.7.HR-MS(MALDI):m/z[M]+cacld for C3H5Br3,277.7941；found,279.7921.
2) Tribromoglycerol (13.9g, 0.05mol) prepared in step 1), 4-hydroxybenzaldehyde (19.9g, 0.16mol) and potassium carbonate (27.6g, 0.20mol) were added to N, N-dimethylformamide (200mL), and the mixture was heated to 100 ℃ to react for 16 hours. The reaction was poured into ice water (500mL) and the residue was filtered off with suction to give intermediate B-1(17.2g, 85%).1H NMR(CDCl3,400MHz):δ4.20-4.25(m,1H),4.72(s,4H),7.15(d,J＝8.0Hz,6H),7.60(d,J＝8.0Hz,6H),9.89(s,3H).13C NMR(CDCl3,100MHz):δ191.01,165.23,163.21,131.90,128.46,114.92,81.85,67.53.HR-MS(MALDI):m/z[M]+cacld for C24H20O6,404.1260；found,405.1265.
3) Adding the intermediate product B-1(20.2g, 0.05mol) prepared in the step 2) and C-1 (n-2) triethylene tetramine (11.0g, 0.075mol) into methanol (100mL), and slowly adding sodium borohydride (5.7g,0.15mol) in portions at 0-10 ℃. After the addition, the reaction mixture was warmed to room temperature and reacted for 5 hours. The solvent was distilled off under reduced pressure, and the residue was dissolved in chloroform and filtered. The filtrate was distilled off under reduced pressure to obtain hyperbranched polyamine P6-1(27.4g, 89%).1H NMR(CDCl3,400MHz):δ2.50-2.55(m,36H),3.76(s,6H),4.17(d,J＝6.8Hz,4H),4.68-4.75(m,1H),7.12(d,J＝8.0Hz,6H),7.56(d,J＝8.0Hz,6H).13C NMR(CDCl3,100MHz):δ157.73,155.76,131.85,131.21,114.25,81.87,67.54,52.36,51.22,49.02,46.32,41.16.
(2) And (3) introducing carbon dioxide gas into the compound P6-1 at normal temperature, and preparing the carbon-rich fluid P6-1 when the pH value of the compound P6-1 is about 7.5.
Example 3
The carbon-rich fluid P4-1 prepared in example 1 and water were mixed to prepare a carbon-rich fluid solution with a mass concentration of 2%.
And (3) crushing the coal sample of the Shanxi willow forest block aiming at the coal rock matrix core, screening 80-100 meshes of powder, and drying in a 110 ℃ drying oven for later use. Adding a carbon-rich fluid solution with the mass concentration of 2% into the coal bed gas fracturing fluid system, and detecting that the anti-swelling rate is 88.13%; KCl with the mass concentration of 2% is added as a control 1, and the anti-swelling rate is 80.22% through detection. The anti-swelling rate is determined by SY-T5971-2016 evaluation method for performances of clay stabilizers for oil and gas field fracturing acidification and water injection.
Example 4
The carbon-rich fluid P4-1 prepared in example 1 and water were mixed to prepare a carbon-rich fluid solution with a mass concentration of 5%.
For sodium montmorillonite, a carbon-rich fluid solution with the mass concentration of 5% is used, and the anti-swelling rate is 93.74% through detection; the use of 5% KCl solution as control 2, detected by the anti-swelling rate of 86.50%. The anti-swelling rate is determined according to SY-T5971-2016 evaluation method for performances of clay stabilizers for oil and gas field fracturing acidification and water injection.
Example 5
The carbon-rich fluid P6-1 prepared in example 2 and water were mixed to prepare a carbon-rich fluid solution with a mass concentration of 1%.
For calcium montmorillonite, a carbon-rich fluid solution with a mass concentration of 1% is used, and the anti-swelling rate is 82.12% through detection; the use of KCl solution with mass concentration of 1% as control 3 detected the anti-swelling rate of 68.09%. The anti-swelling rate is determined according to SY-T5971-2016 evaluation method for performances of clay stabilizers for oil and gas field fracturing acidification and water injection.
Example 6
The carbon-rich fluid P6-1 prepared in example 2 and water were mixed to prepare a carbon-rich fluid solution with a mass concentration of 0.5%.
And (3) crushing rock debris of a reservoir section of a target block of an Ordors basin, screening the rock debris with 80-100 meshes, and drying in a 110 ℃ drying oven for later use. Adding a carbon-rich fluid solution with the mass concentration of 0.5% into a low-permeability oil reservoir pressure-reducing and injection-increasing system, and detecting that the anti-swelling rate is 80.64%; KCl with the mass concentration of 0.5% is added as a control 4, and the anti-swelling rate is detected to be 66.48%. The anti-swelling rate is determined by SY-T5971-2016 evaluation method for performances of clay stabilizers for oil and gas field fracturing acidification and water injection.
Example 7
The carbon-rich fluid P6-1 prepared in example 2 was mixed with water to prepare a 4% carbon-rich fluid solution.
Aiming at sodium bentonite, a carbon-rich fluid solution with the mass concentration of 4% is used, and the anti-swelling rate is 91.15% through detection; the epichlorohydrin/ethylenediamine oligomer solution with the mass concentration of 4% is used, and the anti-swelling rate is 90.88% through detection. The anti-swelling rate is determined by SY-T5971-2016 evaluation method for performances of clay stabilizers for oil and gas field fracturing acidification and water injection.
Example 8
1000ppm of the carbon-rich fluid P4-1 prepared in example 1 was mixed with 2500ppm of polyacrylamide to give oil-displacing agent 1.
Example 9
2000ppm of the carbon-rich fluid P4-1 prepared in example 1 was mixed with 2500ppm of polyacrylamide to give oil-displacing agent 2.
Example 10
1000ppm of the carbon-rich fluid P6-1 prepared in example 2 was mixed with 2500ppm of polyacrylamide to give oil-displacing agent 3.
Example 11
2000ppm of the carbon-rich fluid P6-1 prepared in example 2 was mixed with 2500ppm of polyacrylamide to give oil-displacing agent 4.
Test examples
The oil-displacing agents 1 to 4 prepared in examples 8 to 11 were used for testing polymer flooding; and 2500ppmHPAM was used as a control.
The specific test process is as follows:
adopting simulated crude oil and simulated water; reservoir temperature 65 ℃ and porosity>20%, permeability about 1500 mD; the simulated water total mineralization is about 6000mg/L, wherein the NaCl 5500mg/L, CaCl2500 mg/L; the experimental oil was a simulated oil having an apparent viscosity of 45 mPas (65 ℃ C., shear rate of 7.34 s)-1)。
The physical model is a quartz sand epoxy resin bonded two-dimensional longitudinal heterogeneous artificial core, and the physical dimension is as follows: height × width × length ═ 4.5 × 4.5 × 30cm3Comprises 3 penetration layers with gas permeability of 3000 × 10-3、1500×10-3And 500X 10-3μm2。
The displacement experiment comprises the following specific steps: firstly, vacuumizing a rock core at room temperature, saturating simulated water, and obtaining the pore volume of the rock core; secondly, saturating the core with simulated oil at 60 ℃, and calculating the oil saturation; thirdly, water is driven to 70 percent of water content, and water drive recovery ratio is obtained; and fourthly, injecting 1-4 of the oil displacement agent or the oil displacement agent of the comparative example, and then performing water displacement until the water content is 98 percent, and calculating the recovery ratio. The injection rate for the above experimental procedure was 0.3 mL/min.
The oil displacement result is shown in figure 1, and as can be seen from figure 1, the recovery degree of the polymer HPAM oil displacement synergy is increased along with the increase of the addition amount of the carbon-rich fluid. The carbon-rich fluid can be used as a high-efficiency oil displacement agent for tertiary recovery of petroleum by matching with an oil displacement polymer, so that the recovery rate of the petroleum is improved. Has very important theoretical and practical significance for carbon neutralization and carbon emission reduction.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. Use of a carbon-rich fluid in 1) or 2) as follows:
1) inhibiting clay swelling;
2) preparing a clay stabilizer.
2. The use according to claim 1, wherein the carbon-rich fluid is obtained after absorption of carbon dioxide by a hyperbranched polyamine carbon dioxide absorbent.
3. The use according to claim 2, wherein the hyperbranched polyamine carbon dioxide absorbent has a structural formula of a repeating structural unit of-a-C-or-B-C-, A, B, C having a structural formula as follows:
Figure FDA0003165837280000011
R1,R2,R3,R4each independently represents-Ar-or C1-C8 unsubstituted or substituted alkyl, wherein Ar is a divalent aromatic group; n is 0 to 4.
4. The clay stabilizer is characterized in that a carbon-rich fluid solution with the mass concentration of 0.5-5% is prepared by a carbon-rich fluid and water.
5. The clay stabilizer according to claim 4, wherein the carbon-rich fluid is obtained after absorption of carbon dioxide by a hyperbranched polyamine carbon dioxide absorbent;
preferably, the structural formula of the hyperbranched polyamine carbon dioxide absorbent has a repeating structural unit of-A-C-or-B-C-, and the structural formula of A, B, C is as follows:
Figure FDA0003165837280000012
R1,R2,R3,R4each independently represents-Ar-or C1-C8 unsubstituted or substituted alkyl, wherein Ar is a divalent aromatic group; n is 0 to 4.
6. Use of a carbon-rich fluid in 1) or 2) as follows:
1) oil displacement;
2) and (4) preparing an oil displacement agent.
7. The use according to claim 6, wherein the carbon-rich fluid is obtained after absorption of carbon dioxide by a hyperbranched polyamine carbon dioxide absorbent.
8. The use according to claim 7, wherein the hyperbranched polyamine carbon dioxide absorbent has a structural formula of a repeating structural unit of-A-C-or-B-C-, A, B, C has a structural formula as follows:
Figure FDA0003165837280000021
R1,R2,R3,R4each independently represents-Ar-or C1-C8 unsubstituted or substituted alkyl, wherein Ar is a divalent aromatic group; n is 0 to 4.
9. An oil-displacing agent, characterized by comprising:
the mass concentration ratio of the carbon-rich fluid to the flooding polymer is 1: (1-3).
10. The oil-displacing agent according to claim 9, wherein the carbon-rich fluid is obtained after carbon dioxide is absorbed by a hyperbranched polyamine carbon dioxide absorbent;
preferably, the structural formula of the hyperbranched polyamine carbon dioxide absorbent has a repeating structural unit of-A-C-or-B-C-, and the structural formula of A, B, C is as follows:
Figure FDA0003165837280000022
R1,R2,R3,R4each independently represents-Ar-or C1-C8 unsubstituted or substituted alkyl, wherein Ar is a divalent aromatic group; n is 0-4;
preferably, the flooding polymer is partially hydrolyzed polyacrylamide.
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