CN114790385A - Calcium chloride-weighted high-density slickwater as well as preparation method and application thereof - Google Patents
Calcium chloride-weighted high-density slickwater as well as preparation method and application thereof Download PDFInfo
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- CN114790385A CN114790385A CN202110095925.9A CN202110095925A CN114790385A CN 114790385 A CN114790385 A CN 114790385A CN 202110095925 A CN202110095925 A CN 202110095925A CN 114790385 A CN114790385 A CN 114790385A
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- calcium chloride
- slickwater
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- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 title abstract description 21
- 239000011575 calcium Substances 0.000 title abstract description 21
- 229910052791 calcium Inorganic materials 0.000 title abstract description 21
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 56
- 239000001110 calcium chloride Substances 0.000 claims abstract description 51
- 229910001628 calcium chloride Inorganic materials 0.000 claims abstract description 51
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 36
- 229920000642 polymer Polymers 0.000 claims abstract description 23
- 239000007864 aqueous solution Substances 0.000 claims abstract description 15
- 239000006184 cosolvent Substances 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 52
- 229960002713 calcium chloride Drugs 0.000 claims description 48
- 239000000178 monomer Substances 0.000 claims description 42
- 125000000129 anionic group Chemical group 0.000 claims description 34
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 31
- 238000006243 chemical reaction Methods 0.000 claims description 29
- 239000000654 additive Substances 0.000 claims description 28
- 230000000996 additive effect Effects 0.000 claims description 27
- 239000007789 gas Substances 0.000 claims description 26
- 229920002401 polyacrylamide Polymers 0.000 claims description 21
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 18
- LLSDKQJKOVVTOJ-UHFFFAOYSA-L calcium chloride dihydrate Chemical group O.O.[Cl-].[Cl-].[Ca+2] LLSDKQJKOVVTOJ-UHFFFAOYSA-L 0.000 claims description 16
- 229940052299 calcium chloride dihydrate Drugs 0.000 claims description 16
- 239000003999 initiator Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 14
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 13
- 239000012986 chain transfer agent Substances 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 12
- 239000004094 surface-active agent Substances 0.000 claims description 12
- 125000002091 cationic group Chemical group 0.000 claims description 11
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 6
- 239000003945 anionic surfactant Substances 0.000 claims description 6
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 6
- 230000000977 initiatory effect Effects 0.000 claims description 6
- 229920000570 polyether Polymers 0.000 claims description 6
- 238000006116 polymerization reaction Methods 0.000 claims description 6
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims description 6
- XFTALRAZSCGSKN-UHFFFAOYSA-M sodium;4-ethenylbenzenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C1=CC=C(C=C)C=C1 XFTALRAZSCGSKN-UHFFFAOYSA-M 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 4
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 4
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 claims description 4
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 claims description 4
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 4
- KSCHLNBLIAOANF-UHFFFAOYSA-M ethyl-hexadecyl-dimethylazanium;chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCC[N+](C)(C)CC KSCHLNBLIAOANF-UHFFFAOYSA-M 0.000 claims description 4
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000001632 sodium acetate Substances 0.000 claims description 4
- 235000017281 sodium acetate Nutrition 0.000 claims description 4
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 4
- KSVSZLXDULFGDQ-UHFFFAOYSA-M sodium;4-aminobenzenesulfonate Chemical compound [Na+].NC1=CC=C(S([O-])(=O)=O)C=C1 KSVSZLXDULFGDQ-UHFFFAOYSA-M 0.000 claims description 4
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 claims description 3
- GQOKIYDTHHZSCJ-UHFFFAOYSA-M dimethyl-bis(prop-2-enyl)azanium;chloride Chemical compound [Cl-].C=CC[N+](C)(C)CC=C GQOKIYDTHHZSCJ-UHFFFAOYSA-M 0.000 claims description 3
- DDXLVDQZPFLQMZ-UHFFFAOYSA-M dodecyl(trimethyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCC[N+](C)(C)C DDXLVDQZPFLQMZ-UHFFFAOYSA-M 0.000 claims description 3
- 239000007858 starting material Substances 0.000 claims description 3
- 230000000638 stimulation Effects 0.000 claims description 3
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 2
- 239000004280 Sodium formate Substances 0.000 claims description 2
- 239000012298 atmosphere Substances 0.000 claims description 2
- KXHPPCXNWTUNSB-UHFFFAOYSA-M benzyl(trimethyl)azanium;chloride Chemical compound [Cl-].C[N+](C)(C)CC1=CC=CC=C1 KXHPPCXNWTUNSB-UHFFFAOYSA-M 0.000 claims description 2
- 239000004310 lactic acid Substances 0.000 claims description 2
- 235000014655 lactic acid Nutrition 0.000 claims description 2
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 2
- HLBBKKJFGFRGMU-UHFFFAOYSA-M sodium formate Chemical compound [Na+].[O-]C=O HLBBKKJFGFRGMU-UHFFFAOYSA-M 0.000 claims description 2
- 235000019254 sodium formate Nutrition 0.000 claims description 2
- RRHXZLALVWBDKH-UHFFFAOYSA-M trimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]azanium;chloride Chemical compound [Cl-].CC(=C)C(=O)OCC[N+](C)(C)C RRHXZLALVWBDKH-UHFFFAOYSA-M 0.000 claims description 2
- KVCGISUBCHHTDD-UHFFFAOYSA-M sodium;4-methylbenzenesulfonate Chemical compound [Na+].CC1=CC=C(S([O-])(=O)=O)C=C1 KVCGISUBCHHTDD-UHFFFAOYSA-M 0.000 claims 1
- 230000009467 reduction Effects 0.000 abstract description 9
- 238000004090 dissolution Methods 0.000 abstract description 7
- 150000003839 salts Chemical class 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000035699 permeability Effects 0.000 abstract description 2
- 229960005069 calcium Drugs 0.000 description 19
- 241000894006 Bacteria Species 0.000 description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 239000012530 fluid Substances 0.000 description 12
- 238000010276 construction Methods 0.000 description 10
- 238000000855 fermentation Methods 0.000 description 10
- 230000004151 fermentation Effects 0.000 description 10
- 239000002994 raw material Substances 0.000 description 9
- GLDOVTGHNKAZLK-UHFFFAOYSA-N octadecan-1-ol Chemical compound CCCCCCCCCCCCCCCCCCO GLDOVTGHNKAZLK-UHFFFAOYSA-N 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 230000000813 microbial effect Effects 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 239000012267 brine Substances 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 230000002708 enhancing effect Effects 0.000 description 4
- 230000015784 hyperosmotic salinity response Effects 0.000 description 4
- 238000005342 ion exchange Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000005374 membrane filtration Methods 0.000 description 4
- 238000013048 microbiological method Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- 238000007873 sieving Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 238000006555 catalytic reaction Methods 0.000 description 3
- 238000012258 culturing Methods 0.000 description 3
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010899 nucleation Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000002194 synthesizing effect Effects 0.000 description 3
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- OVHHHVAVHBHXAK-UHFFFAOYSA-N n,n-diethylprop-2-enamide Chemical compound CCN(CC)C(=O)C=C OVHHHVAVHBHXAK-UHFFFAOYSA-N 0.000 description 2
- DNTMQTKDNSEIFO-UHFFFAOYSA-N n-(hydroxymethyl)-2-methylprop-2-enamide Chemical compound CC(=C)C(=O)NCO DNTMQTKDNSEIFO-UHFFFAOYSA-N 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- KFZUDNZQQCWGKF-UHFFFAOYSA-M sodium;4-methylbenzenesulfinate Chemical compound [Na+].CC1=CC=C(S([O-])=O)C=C1 KFZUDNZQQCWGKF-UHFFFAOYSA-M 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical class [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- MNCGMVDMOKPCSQ-UHFFFAOYSA-M sodium;2-phenylethenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C=CC1=CC=CC=C1 MNCGMVDMOKPCSQ-UHFFFAOYSA-M 0.000 description 1
- 230000003335 steric effect Effects 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
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- 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
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
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- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
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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
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
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Abstract
The invention provides a calcium chloride weighted high-density slickwater and a preparation method and application thereof, wherein the calcium chloride weighted high-density slickwater comprises the following components: 100 parts by volume of calcium chloride aqueous solution; 0.1-0.3 parts by weight of polymer drag reducer; 0.4-1.0 volume part of cosolvent; 0.3-0.5 volume part of discharge assistant. The calcium chloride-weighted high-density slickwater provided by the invention has the advantages of high-concentration ionic salt resistance, good dissolution performance of a drag reducer, excellent drag reduction performance and the like, and can be applied to fracturing production increase of three-super (ultrahigh temperature, ultrahigh pressure and super deep) and one-low (low permeability) oil and gas reservoirs.
Description
Technical Field
The invention relates to a calcium chloride-weighted high-density slickwater and a preparation method and application thereof, belonging to the technical field of oil-gas field development.
Background
In recent years, the deep ultra-deep layer oil gas in China has become an important exploration field, and the deep layer oil gas gradually becomes the next important resource succession field of the Chinese oil gas exploration by taking blocks in front of Tarim warehouse vehicle mountains, in-north oil fields of Tahe, Xinjiang Quger south edge, Zhongshan mountain of Sichuan basin and the like as representatives. However, the three-super characteristic of deep oil gas is obvious, and the world-level problems of super depth (6500-8882m), high temperature (150-200 ℃), and high pressure (105-136MPa) are faced, so that the construction pressure of the modified well is high, the displacement is low, and reservoir modification in the field can not realize large displacement and large liquid quantity all the time so as to meet the requirement of ultra-deep well volume modification.
In recent years, the heavy fracturing fluid is taken as one of effective measures for solving the yield increase transformation of the ultra-deep high-pressure reservoir, and certain development is achieved. However, friction resistance is an important factor for restricting the use of the aggravated fracturing fluid, statistics of the ultra-deep aggravated fracturing fluid construction well shows that the liquid density is increased generally, and the construction pressure reduction value does not reach the theoretical effect.
According to the single-term fluid friction coefficient relation proposed by jamin (Jain) (1976): the formula (1) and the formula (3) show that the other important parameter influencing the wellhead construction pressure is the on-way friction resistance.
It can be seen from formula (1) that after the fracturing string is determined, the friction loss Pf is only related to the liquid density and the friction coefficient, and further from formula (2) to formula (3), the increase of the liquid density, the friction coefficient and the viscosity increases the on-way friction, and it can be seen that the viscosity and the density are key parameters of the construction pressure.
Accordingly, it is important to formulate weighting brines with weighting agents to increase the density of slickwater, but high density brines are challenging to dissolve and viscosity affect on thickeners that typically do not have salt tolerance, particularly, divalent hypersalinity salts.
In view of the above, it is a technical problem to be solved in the art to provide a calcium chloride aggravated high-density slickwater and to make the drag reducer resistant to high-concentration ionic salts.
Disclosure of Invention
To address the above-described disadvantages and shortcomings, it is an object of the present invention to provide a calcium chloride weighted high density slickwater. The calcium chloride-weighted high-density slickwater provided by the invention has the advantages of high-concentration ionic salt resistance, good dissolution performance of a drag reducer, excellent drag reduction performance and the like, and can be applied to fracturing production increase of three-super (ultrahigh temperature, ultrahigh pressure and ultra-deep) and one-low (low permeability) oil and gas reservoirs.
It is another object of the present invention to provide a method for preparing the above-described calcium chloride-weighted high-density slickwater.
The invention also aims to provide application of the calcium chloride weighted high-density slickwater in fracturing stimulation of deep and ultra-deep oil and gas reservoirs.
To achieve the above objects, in one aspect, the present invention provides a calcium chloride-weighted high-density slickwater, wherein the calcium chloride-weighted high-density slickwater comprises:
as a specific embodiment of the invention, the calcium chloride aggravated high-density slippery water has a density of 1.15g/mL-1.5g/mL, preferably 1.15g/mL-1.35 g/mL.
In a specific embodiment of the present invention, the calcium chloride aggravates the high-density slickwater, wherein the solute for preparing the calcium chloride aqueous solution is calcium chloride dihydrate. The adoption of calcium chloride dihydrate has the advantages of better aggravation efficiency and cost.
As a specific embodiment of the present invention, the calcium chloride-weighted high-density slickwater is a calcium chloride-weighted high-density slickwater, wherein the polymer drag reducer is an anionic acrylamide polymer, and the raw material composition of the anionic acrylamide polymer comprises, based on 100% by weight of the total raw materials used for preparing the anionic acrylamide polymer: 15-25 wt% of acrylamide monomer, 5-12 wt% of cationic monomer, 8-15 wt% of anionic monomer, 1-5 wt% of nonionic monomer, 0.01-0.1 wt% of initiator, 0.05-0.2 wt% of chain transfer agent and the balance of water.
The anionic acrylamide polymer provided by the invention is a polymer capable of resisting high-concentration salt, particularly divalent calcium ion salt, and the salt tolerance of the polymer can reach 25-46 ppm. In the polymer, acrylamide has the functions of providing a C-C rigid main chain and an amido crosslinking group which can improve the shearing resistance and the temperature resistance of a high polymer and can also improve the drag reduction rate; the cationic monomer has the functions of providing stronger solubility, structural viscosity and elasticity and enhancing structural stability; the function of the anionic monomer is to provide salt tolerance and thermal stability; the function of the nonionic monomer is to improve the temperature resistance and salt tolerance of the anionic acrylamide polymer by using the steric effect of the nonionic monomer.
The polymer mainly comprises a C-C rigid main chain for improving the shearing resistance and the temperature resistance of a macromolecule, a sulfonic group for improving the salt resistance, a hydrophobic group for enhancing hydrophobicity, a hydrolysis-resistant group for enhancing the stability of the macromolecule and a strong coordination group for enhancing instant crosslinking.
As a specific embodiment of the present invention, the calcium chloride-weighted high-density slickwater comprises one or more cationic monomers selected from the group consisting of hexadecyl dimethyl ethyl ammonium chloride, dodecyl trimethyl ammonium chloride, dimethyl diallyl ammonium chloride, methacryloyl oxyethyl trimethyl ammonium chloride, and benzyl trimethyl ammonium chloride.
As a specific embodiment of the present invention, the calcium chloride aggravates the high-density slickwater, wherein the anionic monomer comprises one or more of sodium 4-aminobenzenesulfonate, sodium p-styrenesulfonate, methacrylic acid, acrylonitrile, sodium p-toluenesulfinate, sodium 4-styrenesulfonate, sodium p-styrenesulfonate, and acrylamide.
As a specific embodiment of the present invention, the calcium chloride-weighted high-density slickwater comprises one or more of N-tris (hydroxymethyl) methyl-acrylamide, N-vinylpyrrolidone, N-dimethylacrylamide and N, N-diethylacrylamide.
As a specific embodiment of the present invention, the calcium chloride aggravates the high-density slickwater, wherein the initiator comprises one or more of sodium persulfate, potassium persulfate, ammonium persulfate, and hydrogen peroxide.
As a specific embodiment of the calcium chloride weighted high-density slickwater, the chain transfer agent comprises one or more of sodium formate, sodium acetate, mercaptan and isopropanol.
As a preferable embodiment of the present invention, the calcium chloride-fortified high-density slickwater is prepared by copolymerizing acrylamide, hexadecyl dimethyl ethyl ammonium chloride, sodium 4-aminobenzenesulfonate, N-vinyl pyrrolidone, ammonium persulfate, and mercaptan.
As a specific embodiment of the present invention, the calcium chloride-weighted high-density slickwater is prepared by polymerizing the anionic acrylamide polymer by a method comprising the following steps:
1) adding an acrylamide monomer, a cationic monomer, an anionic monomer and a nonionic monomer into water, and adding a chain transfer agent;
2) adjusting the pH and the temperature of a reaction system, and introducing protective gas; adding an initiator into the reaction system under the atmosphere of protective gas, and stopping introducing the protective gas after initiating the polymerization reaction;
3) controlling the peak temperature of the reaction system to be less than 100 ℃, and continuing to react for 4-6h after the reaction system reaches the highest temperature to obtain a polymerization product.
As a specific embodiment of the present invention, in the step 2), the pH is 6 to 7, and the temperature is 40 to 60 ℃.
As a specific embodiment of the present invention, the calcium chloride-weighted high-density slickwater is prepared by, in step 2), introducing the shielding gas for 15min, sequentially adding the initiator into the reaction system every 5min, and stopping introducing the shielding gas after initiating the polymerization reaction; the amount of initiator added at each time was 10% of its total amount.
As a specific embodiment of the present invention, the calcium chloride aggravated high-density slickwater further comprises the following steps:
4) the resultant polymer gel was added with a dispersing agent to granulate, followed by drying, pulverization, and sieving.
As a specific embodiment of the calcium chloride weighted high-density slickwater, the calcium chloride weighted high-density slickwater is characterized in that the drying temperature is 50-70 ℃, and 80-120 meshes of particles are crushed and screened and reserved.
As a specific embodiment of the present invention, the calcium chloride-weighted high-density slickwater is characterized in that the dispersing substance comprises octadecanol.
As a specific embodiment of the calcium chloride-weighted high-density slickwater according to the invention, the acrylamide monomer is prepared by the following microbiological method:
adding acrylonitrile into fermentation liquor with enough bacteria quantity to metabolize acrylonitrile universal for bacteria to generate acrylamide, and refining the generated acrylamide aqueous solution through membrane filtration and an ion exchange column to obtain the acrylamide monomer.
As a specific embodiment of the present invention, the calcium chloride aggravates the high-density slickwater, wherein the cosolvent comprises one or a combination of lactic acid, acetic acid and hydrochloric acid.
As a specific embodiment of the present invention, the calcium chloride aggravates the high-density slickwater, wherein the cleanup additive is a fluorocarbon anionic cleanup additive, and the cleanup additive comprises, by taking the total weight of the cleanup additive as 100%, 1-2 wt% of a fluorocarbon anionic surfactant, 5-15 wt% of a polyether surfactant, 5-10 wt% of a quaternary ammonium salt surfactant, and the balance of water. The cleanup additive used in the invention has excellent salt resistance.
The fluorocarbon anionic surfactant, the polyether surfactant and the quaternary ammonium salt surfactant are conventional substances and can be prepared by commercial products or laboratories.
On the other hand, the invention also provides a preparation method of the calcium chloride aggravated high-density slickwater, wherein the preparation method comprises the following steps:
and adding a polymer drag reducer, a cosolvent and a cleanup additive into the calcium chloride aqueous solution under the stirring state to form a uniform solution.
In another aspect, the invention also provides application of the calcium chloride weighted high-density slickwater in fracturing stimulation of deep and ultra-deep oil and gas reservoirs.
Compared with the prior art, the invention has the following beneficial effects:
(1) the calcium chloride aggravated high-density slickwater provided by the invention has the advantages of simple formula, stable performance, economy and applicability;
(2) according to the invention, by analyzing the characteristics of the weighted fracturing fluid construction well and the conventional slickwater, the calcium chloride weighted high-density slickwater suitable for the high-temperature deep well is researched and developed, the weighted density is 1.15-1.5g/mL, the use concentration of the drag reducer is 0.1-0.3% (mass-volume ratio, calculated by taking the volume of a calcium chloride aqueous solution as a reference), the viscosity is 6-15mPa & s, the high-temperature-resistant shear-resistant water has good temperature-resistant shear-resistant performance and drainage-assistant performance, the drag reduction rate can reach 63.4%, the core damage rate is below 15.0%, the high-density slickwater has better sand carrying performance than the conventional slickwater, has a better drag reduction effect than the conventional weighted fracturing fluid, can effectively reduce the construction pressure and the construction risk, and provides a new technical support for the modification of an ultrahigh-pressure ultra-deep well reservoir stratum.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a graph of the dissolution of polymer drag reducer FA31 and shale gas well conventional drag reducer in 46 ppm of calcium chloride dihydrate water, respectively, in test example 1 of the present invention;
in the figure, 1 is the dissolution state of shale gas drag reducer 1 used in oil fields in 46 ten thousand ppm calcium chloride dihydrate water;
in the figure 2, the shale gas drag reducer 2 for oil field is dissolved in 46 ppm calcium chloride dihydrate water;
FIG. 3 is a graph showing the dissolution of polymeric drag reducer FA31 in 46 ppm calcium chloride dihydrate water.
Detailed Description
In order to clearly understand the technical features, objects and advantages of the present invention, the following detailed description of the technical solutions of the present invention will be made with reference to the following specific examples, which should not be construed as limiting the implementable scope of the present invention.
Example 1
This example provides a calcium chloride-fortified high-density slickwater prepared by the following method:
adding 620g of calcium chloride dihydrate into 730g of water to prepare 1000mL of calcium chloride brine (with the mass concentration of 46%) with the density of 1.35mg/L, continuously adding 2g of polymer drag reducer under the stirring state, stirring for 5 minutes, adding 5mL of cosolvent and 3mL of cleanup additive, and uniformly stirring to prepare the calcium chloride aggravated high-density slickwater for later use.
In this embodiment, the cleanup additive is a fluorocarbon anionic cleanup additive, and comprises 1 wt% of a fluorocarbon anionic surfactant, 6 wt% of a polyether surfactant, 9 wt% of a quaternary ammonium salt surfactant, and the balance of water, where the total weight of the cleanup additive is 100%.
In this example, acetic acid was used as the co-solvent.
In this example, the polymeric drag reducer used is an anionic acrylamide polymer, based on 100% by total weight of the starting materials used to prepare the anionic acrylamide polymer: the raw material composition comprises: 19% of acrylamide monomer, 8% of cationic monomer dodecyl trimethyl ammonium chloride, 9% of anionic monomer sodium p-toluenesulfinate, 4% of nonionic monomer N-tri (hydroxymethyl) methyl-acrylamide, 0.03% of initiator sodium persulfate, 0.08% of chain transfer agent sodium acetate and the balance of water.
Wherein, the acrylamide monomer is prepared according to the following steps (preparing acrylamide by a microbiological method):
the method comprises the steps of firstly carrying out three-stage amplification culture on special microbial bacteria, culturing the special microbial bacteria into fermentation liquor with sufficient bacteria quantity through a strain bottle, a seeding tank and a fermentation tank, then transferring the fermentation liquor into a hydration catalytic reaction kettle, and adding acrylonitrile to enable the bacteria to metabolize the acrylonitrile to generate acrylamide. The acrylamide aqueous solution produced later contains residual bacteria, residual acrylonitrile and other impurities, so that membrane filtration and ion exchange columns are required for refining treatment, and the finally produced acrylamide aqueous solution is the main raw material for synthesizing the anionic acrylamide polymer.
The anionic acrylamide polymer is prepared by the following specific steps:
1) mixing acrylamide monomer, cationic monomer, anionic monomer and nonionic monomer according to the proportion;
sequentially adding the proportioned monomers into quantitative deionized water to prepare a solution, and adding a required amount of chain transfer agent;
2) adjusting the pH value of the solution to 6-7; adjusting the reaction temperature to 45 ℃, introducing nitrogen into the reaction system, adding 10 percent of the total amount of the initiator into the reaction system every 5min after 15min, and stopping the nitrogen after initiation;
3) controlling the peak temperature of the whole reaction system to be less than 100 ℃, and continuously reacting for 4 hours after the reaction of the reaction system reaches the highest temperature and discharging;
4) transferring the polymerized discharged material into a granulator, adding a dispersed substance octadecanol, and then transferring into a drying bed, a pulverizer and a sieving machine to form the final required product.
Example 2
This example provides a calcium chloride-fortified high-density slickwater prepared by the following method:
413g of calcium chloride dihydrate is added into 837g of water to prepare 1000mL of calcium chloride saline (with the mass concentration of 33%) with the density of 1.25mg/L, 2.5g of polymer drag reducer is added under the stirring state, the stirring is carried out for 5 minutes, 6mL of cosolvent and 3mL of cleanup additive are added, the stirring is carried out uniformly, and the calcium chloride weighted high-density slickwater is prepared for standby.
In this example, acetic acid was used as a co-solvent.
In this example, the polymeric drag reducer used is an anionic acrylamide polymer, based on 100% by total weight of the starting materials used to prepare the anionic acrylamide polymer: the raw material composition comprises: 21% of acrylamide monomer, 6% of cationic monomer dimethyl diallyl ammonium chloride, 12% of anionic monomer 4-aminobenzenesulfonic acid sodium salt, 3% of nonionic monomer N, N-diethyl acrylamide, 0.01% of initiator ammonium persulfate, 0.1% of chain transfer agent sodium acetate and the balance of water.
Wherein, the acrylamide monomer is prepared according to the following steps (the acrylamide is prepared by a microbiological method):
the method comprises the steps of firstly carrying out three-stage amplification culture on special microbial bacteria, culturing the special microbial bacteria into fermentation liquor with sufficient bacteria number through a strain bottle, a seeding tank and a fermentation tank, then transferring the fermentation liquor into a hydration catalytic reaction kettle, and adding acrylonitrile to enable the bacteria to metabolize the acrylonitrile to generate acrylamide. The acrylamide aqueous solution produced later contains residual bacteria, residual acrylonitrile and other impurities, so membrane filtration and ion exchange columns are required for refining treatment, and the finally produced acrylamide aqueous solution is the main raw material for synthesizing the anionic acrylamide polymer.
The anionic acrylamide polymer is prepared by the following specific steps:
1) mixing acrylamide monomer, cationic monomer, anionic monomer and nonionic monomer according to the proportion;
sequentially adding the proportioned monomers into quantitative deionized water to prepare a solution, and adding a required amount of chain transfer agent;
2) adjusting the pH value of the solution to 6-7; adjusting the reaction temperature to 55 ℃, introducing nitrogen into the reaction system, adding 10 percent of the total amount of the initiator into the reaction system every 5min after 15min, and stopping nitrogen after initiation;
3) controlling the peak temperature of the whole reaction system to be less than 100 ℃, continuing the reaction for 5 hours after the reaction of the reaction system reaches the highest temperature, and discharging;
4) transferring the polymerized discharged material into a granulator, adding a dispersed substance octadecanol, and then transferring into a drying bed, a pulverizer and a sieving machine to form the final required product.
In this embodiment, the cleanup additive is a fluorocarbon anionic cleanup additive (denoted as ZD-4), and comprises 1.8% of a fluorocarbon anionic surfactant, 8% of a polyether surfactant, 7% of a quaternary ammonium salt surfactant, and the balance water, based on 100% of the total weight of the cleanup additive.
Example 3
This example provides a calcium chloride-fortified high-density slickwater prepared by the following method:
adding 620g of calcium chloride dihydrate into 730g of water to prepare 1000mL of calcium chloride brine (with the mass concentration of 46%) with the density of 1.35mg/L, continuously adding 1.5g of polymer drag reducer under the stirring state, stirring for 5 minutes, adding 4mL of cosolvent and 5mL of cleanup additive, and uniformly stirring to prepare the calcium chloride aggravated high-density slickwater for later use.
In this embodiment, the used cleanup additive is a fluorocarbon anionic cleanup additive, and the cleanup additive comprises, based on 100% of the total weight of the cleanup additive, 1.2% of a fluorocarbon anionic surfactant, 10% of a polyether surfactant, 6% of a quaternary ammonium salt surfactant, and the balance water.
In this example, the cosolvent used was hydrochloric acid.
In this example, the polymeric drag reducer used was an anionic acrylamide polymer, based on 100% by total weight of the raw materials used to prepare the anionic acrylamide polymer: the raw materials comprise: 17% of acrylamide monomer, 10% of cationic monomer hexadecyl dimethyl ethyl ammonium chloride, 13% of anionic monomer sodium styrene sulfonate, 2% of nonionic monomer N-tri (hydroxymethyl) methyl-acrylamide, 0.05% of initiator sodium persulfate, 0.12% of chain transfer agent mercaptan and the balance of water.
Wherein, the acrylamide monomer is prepared according to the following steps (preparing acrylamide by a microbiological method):
the method comprises the steps of firstly carrying out three-stage amplification culture on special microbial bacteria, culturing the special microbial bacteria into fermentation liquor with sufficient bacteria number through a strain bottle, a seeding tank and a fermentation tank, then transferring the fermentation liquor into a hydration catalytic reaction kettle, and adding acrylonitrile to enable the bacteria to metabolize the acrylonitrile to generate acrylamide. The acrylamide aqueous solution produced later contains residual bacteria, residual acrylonitrile and other impurities, so that membrane filtration and ion exchange columns are required for refining treatment, and the finally produced acrylamide aqueous solution is the main raw material for synthesizing the anionic acrylamide polymer.
The anionic acrylamide polymer is prepared by the following specific steps:
1) proportioning an acrylamide monomer, a cationic monomer, an anionic monomer and a nonionic monomer according to the proportion;
sequentially adding the proportioned monomers into quantitative deionized water to prepare a solution, and adding a required amount of chain transfer agent;
2) adjusting the pH value of the solution to 6-7; regulating the reaction temperature to 50 ℃, introducing nitrogen into the reaction system, adding 10 percent of the total amount of the initiator into the reaction system every 5min after 15min, and stopping nitrogen after initiation;
3) controlling the peak temperature of the whole reaction system to be less than 100 ℃, and continuing to react for 6 hours after the reaction of the reaction system reaches the highest temperature and discharging;
4) transferring the polymerized discharged material into a granulator, adding a dispersed substance octadecanol, and transferring into a drying bed, a pulverizer and a sieving machine to form the final required product.
Test example 1
To compare the viscosity of the polymer drag reducer (designated as FA31) prepared in this example 1 with the viscosity of shale gas well drag reducers in clean water and 46 ten thousand ppm calcium chloride dihydrate water, respectively, the viscosity of the polymer drag reducer in clean water and the viscosity of the polymer drag reducer in 46 ten thousand ppm calcium chloride dihydrate water were tested. The viscosity of the polymer drag reducer (designated as FA31) prepared in example 1 and the viscosity of the shale gas well drag reducer in clean water and in 46 ten thousand ppm of calcium chloride dihydrate water are shown in table 1 below, and the dissolution states of the polymer drag reducer FA31 and the shale gas well drag reducer in 46 ten thousand ppm of calcium chloride dihydrate water are shown in fig. 1.
TABLE 1 viscosity of different drag reducing agents (0.1%) in clear water and brine solutions
Wherein, the concentration of 0.1 percent is the weight-volume ratio concentration calculated by taking the volume of clear water or saline water as a reference;
the viscosity is measured according to the method specified in the industry Standard 5107-2016 Water-based fracturing fluid Performance evaluation methods.
As can be seen from table 1 and fig. 1, the polymer drag reducer synthesized in this example has good solubility in high-concentration calcium chloride salt water (see 3 in fig. 1), the viscosity of the polymer drag reducer after dissolution at a concentration of 0.1% is 6.56mPa · s, while the conventional oilfield shale gas drag reducer 1-2 is insoluble in high-density calcium chloride salt water (see 1 and 2 in fig. 1), has a viscosity of less than 3.6mPa · s, and the viscosity of the calcium chloride dihydrate aqueous solution having a mass concentration of 46% is 3.21mPa · s, which indicates that the conventional oilfield shale gas drag reducer is insoluble in high-concentration brine and does not become sticky in high-concentration brine.
Test example 2
In order to compare the performance of the fluorocarbon anionic cleanup additive (ZD-4) provided in this example 2 with the performance of a cleanup additive (YL-3) for a certain conventional guanidine gum fracturing fluid, this test example evaluated the performance of the two cleanup additives, and specifically included the following steps:
preparing non-aggravated slick water: first, 1.5g of the polymer drag reducer prepared in example 2 was added to 1000g of water, stirred for 5 minutes, and then 4mL of a cosolvent (acetic acid) was added; then, the two discharge aids are respectively added according to the concentration of 0.3 percent and 0.5 percent (the volume ratio of the discharge aid to the water), and the mixture is uniformly stirred to prepare four non-aggravated slickwater containing the discharge aids with different concentrations and different types to be tested.
Preparing weighted slick water: firstly, adding 620g of calcium chloride dihydrate into 730g of water to prepare 1000mL of calcium chloride salt water with the density of 1.35mg/L, continuously adding 1.5g of the polymer drag reducer prepared in the embodiment 2 under the stirring state, stirring for 5 minutes, and then adding 4mL of cosolvent (acetic acid); then, the two discharge aids are respectively added according to the proportion of 0.3 percent and 0.5 percent (the volume ratio of the discharge aid to the water), and are uniformly stirred to prepare four non-weighted slickwater containing discharge aids with different concentrations and different types to be tested.
The drainage-assisting performance of the non-weighted slick water and the weighted slick water prepared by the method specified in the industry standard 5107-2016 water-based fracturing fluid performance evaluation method is tested, and the drainage-assisting performance data of the fluorocarbon anionic drainage-assisting agent ZD-4 used in the embodiment 2 and the conventional drainage-assisting agent YL-3 in the field are shown in the following table 2.
Table 2 surface tension data of the cleanup additive in different solutions
| Discharge aiding agent | YL-3, 0.3% in weight | YL-3, 0.5% in weight | ZD-4, 0.3% by weight | ZD-4, 0.5% in weight |
| Non-weighted slick water | 23.78mN/m | 21.54mN/m | 22.71mN/m | 20.98mN/m |
| Weighted slick water | 32.10mN/m | 29.81mN/m | 28.97mN/m | 26.53mN/m |
As can be seen from table 2, compared with the conventional cleanup additive YL-3, the fluorocarbon anionic cleanup additive ZD-4 used in this example 2 has a lower surface tension, which indicates that it has a better performance of reducing surface tension, is more beneficial to flowback of fracturing fluid, and can reduce damage to the reservoir.
Test example 3
In this test example, the properties of the calcium chloride-weighted high-density slickwater provided in examples 1 to 3 were respectively tested according to the method specified in the industry standard 5107-2016 water-based fracturing fluid performance evaluation method, and the test results are shown in table 3 below.
Table 3 performance data for calcium chloride weighted high density slickwater provided in examples 1-3
| Serial number | Viscosity, mPas | Surface tension, mN/m | A drag reduction ratio of% | Rate of damage% |
| Example 1 | 11.3 | 28.97 | 62.3 | 11.3 |
| Example 2 | 13.6 | 28.97 | 61.9 | 14.5 |
| Example 3 | 8.2 | 26.53 | 63.4 | 12.6 |
As can be seen from table 3, under the conditions that the water density of the calcium chloride salt used in the calcium chloride weighted high-density slickwater provided in the embodiment is 1.15-1.5g/mL, the use concentration of the drag reducer is 0.1-0.3% (mass-volume ratio, calculated based on the volume of the calcium chloride aqueous solution), the viscosity of the slickwater is 6-15mPa · s, the slickwater has good temperature resistance, shear resistance and drainage assistance performance, the drag reduction rate can reach 63.4%, the core damage rate is below 15%, the slickwater has better sand carrying performance than a conventional slickwater, has a better drag reduction effect than a conventional weighted fracturing fluid, can effectively reduce the construction pressure and the construction risk, and provides a new technical support for ultrahigh-pressure ultra-deep well reservoir transformation.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features and the technical inventions of the present invention, the technical features and the technical inventions, and the technical inventions can be freely combined and used.
Claims (16)
1. A calcium chloride weighted high density slickwater, the calcium chloride weighted high density slickwater comprising:
2. the calcium chloride weighted high density slick water of claim 1 wherein the density of the aqueous calcium chloride solution is between 1.15g/mL and 1.5 g/mL.
3. A calcium chloride weighted high density slickwater according to claim 1 or 2, characterized in that the solute used for preparing the aqueous solution of calcium chloride is calcium chloride dihydrate.
4. The calcium chloride weighted high density slickwater according to claim 1 or 2, characterized in that the polymeric drag reducer is an anionic acrylamide polymer having a starting composition comprising, based on 100% by weight of the total starting materials used for the preparation of the anionic acrylamide polymer: 15-25 wt% of acrylamide monomer, 5-12 wt% of cationic monomer, 8-15 wt% of anionic monomer, 1-5 wt% of nonionic monomer, 0.01-0.1 wt% of initiator, 0.05-0.2 wt% of chain transfer agent and the balance of water.
5. The calcium chloride weighted high density slickwater according to claim 4, wherein the cationic monomer comprises one or more of hexadecyldimethylethylammonium chloride, dodecyltrimethylammonium chloride, dimethyldiallylammonium chloride, methacryloyloxyethyltrimethylammonium chloride, benzyltrimethylammonium chloride.
6. The calcium chloride weighted high-density slickwater according to claim 4, wherein the anionic monomer comprises one or more of sodium 4-aminobenzenesulfonate, sodium p-styrenesulfonate, methacrylic acid, acrylonitrile, sodium p-toluenesulfonate, sodium 4-styrenesulfonate, sodium p-styrenesulfonate, acrylamide.
7. The calcium chloride weighted high density slickwater according to claim 4, characterized in that the non-ionic monomer comprises one or several of N-tris (hydroxymethyl) methyl-acrylamide, N-vinylpyrrolidone, N-dimethylacrylamide, N-diethylacrylamide.
8. The calcium chloride weighted high density slickwater according to claim 4, characterized in that the initiator comprises one or several of sodium persulfate, potassium persulfate, ammonium persulfate, hydrogen peroxide.
9. The calcium chloride weighted high-density slickwater according to claim 4, characterized in that the chain transfer agent comprises one or several of sodium formate, sodium acetate, mercaptan, isopropanol.
10. A calcium chloride weighted high density slickwater according to any of the claims 4-9, characterised in that the anionic acrylamide polymer is polymerised by a process comprising the steps of:
1) adding an acrylamide monomer, a cationic monomer, an anionic monomer and a nonionic monomer into water, and adding a chain transfer agent;
2) adjusting the pH and temperature of the reaction system, and introducing protective gas; adding an initiator into the reaction system under the atmosphere of protective gas, and stopping introducing the protective gas after initiating the polymerization reaction;
3) controlling the peak temperature of the reaction system to be less than 100 ℃, and continuing to react for 4-6h after the reaction system reaches the highest temperature to obtain a polymerization product.
11. The calcium chloride weighted high density slickwater according to claim 10, characterized in that in step 2) the pH is 6-7 and the temperature is 40-60 ℃.
12. The calcium chloride weighted high-density slickwater as claimed in claim 10, wherein in the step 2), the protective gas is introduced for 15min, then the initiator is added into the reaction system in sequence every 5min, and the protective gas is stopped being introduced after the polymerization reaction is initiated; the amount of initiator added at each time was 10% of its total amount.
13. The calcium chloride weighted high-density slickwater according to claim 1 or 2, characterized in that the cosolvent comprises one or a combination of lactic acid, acetic acid, hydrochloric acid.
14. The calcium chloride weighted high-density slickwater according to claim 1 or 2, characterized in that the cleanup additive comprises 1-2 wt% of fluorocarbon anionic surfactant, 5-15 wt% of polyether surfactant, 5-10 wt% of quaternary ammonium salt surfactant and the balance of water, based on the total weight of the cleanup additive being 100%.
15. A process for the preparation of a calcium chloride weighted high density slickwater according to any one of the claims 1 to 14, characterized in that the process comprises:
and adding a polymer drag reducer, a cosolvent and a cleanup additive into the calcium chloride aqueous solution under the stirring state to form a uniform solution.
16. Use of the calcium chloride weighted high density slickwater of any one of claims 1-14 for stimulation of fracturing in deep and ultra deep reservoirs.
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Application publication date: 20220726 |