CN116144330A - Super-hydrophobic hydrolysis water locking agent for relieving gas well water locking injury, preparation method and filling process - Google Patents
Super-hydrophobic hydrolysis water locking agent for relieving gas well water locking injury, preparation method and filling process Download PDFInfo
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 97
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 230000003075 superhydrophobic effect Effects 0.000 title claims abstract description 83
- 230000006378 damage Effects 0.000 title claims abstract description 25
- 230000007062 hydrolysis Effects 0.000 title claims abstract description 22
- 238000006460 hydrolysis reaction Methods 0.000 title claims abstract description 22
- 208000027418 Wounds and injury Diseases 0.000 title claims abstract description 19
- 208000014674 injury Diseases 0.000 title claims abstract description 19
- 235000020681 well water Nutrition 0.000 title claims abstract description 16
- 239000002349 well water Substances 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 238000005429 filling process Methods 0.000 title claims abstract description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 198
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 92
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 92
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- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims abstract description 13
- BPCXHCSZMTWUBW-UHFFFAOYSA-N triethoxy(1,1,2,2,3,3,4,4,5,5,8,8,8-tridecafluorooctyl)silane Chemical compound CCO[Si](OCC)(OCC)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)CCC(F)(F)F BPCXHCSZMTWUBW-UHFFFAOYSA-N 0.000 claims abstract description 12
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- 239000003607 modifier Substances 0.000 claims abstract description 11
- PMQIWLWDLURJOE-UHFFFAOYSA-N triethoxy(1,1,2,2,3,3,4,4,5,5,6,6,7,7,10,10,10-heptadecafluorodecyl)silane Chemical compound CCO[Si](OCC)(OCC)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)CCC(F)(F)F PMQIWLWDLURJOE-UHFFFAOYSA-N 0.000 claims abstract description 8
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- 238000000034 method Methods 0.000 claims description 16
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 13
- -1 perfluorononenoxybenzenesulfonic acid sodium Chemical compound 0.000 claims description 13
- 229920000570 polyether Polymers 0.000 claims description 13
- 239000011148 porous material Substances 0.000 claims description 12
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 11
- 230000032683 aging Effects 0.000 claims description 11
- 238000010276 construction Methods 0.000 claims description 11
- 235000019441 ethanol Nutrition 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 10
- 229920001296 polysiloxane Polymers 0.000 claims description 10
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 9
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 claims description 9
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 125000005007 perfluorooctyl group Chemical group FC(C(C(C(C(C(C(C(F)(F)F)(F)F)(F)F)(F)F)(F)F)(F)F)(F)F)(F)* 0.000 claims description 7
- 150000002148 esters Chemical class 0.000 claims description 6
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- ZTOKUMPYMPKCFX-CZNUEWPDSA-N (E)-17-[(2R,3R,4S,5S,6R)-6-(acetyloxymethyl)-3-[(2S,3R,4S,5S,6R)-6-(acetyloxymethyl)-3,4,5-trihydroxyoxan-2-yl]oxy-4,5-dihydroxyoxan-2-yl]oxyoctadec-9-enoic acid Chemical compound OC(=O)CCCCCCC/C=C/CCCCCCC(C)O[C@@H]1O[C@H](COC(C)=O)[C@@H](O)[C@H](O)[C@H]1O[C@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](COC(C)=O)O1 ZTOKUMPYMPKCFX-CZNUEWPDSA-N 0.000 claims description 5
- FCBUKWWQSZQDDI-UHFFFAOYSA-N rhamnolipid Chemical compound CCCCCCCC(CC(O)=O)OC(=O)CC(CCCCCCC)OC1OC(C)C(O)C(O)C1OC1C(O)C(O)C(O)C(C)O1 FCBUKWWQSZQDDI-UHFFFAOYSA-N 0.000 claims description 5
- 229920001285 xanthan gum Polymers 0.000 claims description 5
- 239000000230 xanthan gum Substances 0.000 claims description 5
- 229940082509 xanthan gum Drugs 0.000 claims description 5
- 235000010493 xanthan gum Nutrition 0.000 claims description 5
- 108010028921 Lipopeptides Proteins 0.000 claims description 4
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 4
- XQSBLCWFZRTIEO-UHFFFAOYSA-N hexadecan-1-amine;hydrobromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[NH3+] XQSBLCWFZRTIEO-UHFFFAOYSA-N 0.000 claims description 4
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 4
- DAJSVUQLFFJUSX-UHFFFAOYSA-M sodium;dodecane-1-sulfonate Chemical compound [Na+].CCCCCCCCCCCCS([O-])(=O)=O DAJSVUQLFFJUSX-UHFFFAOYSA-M 0.000 claims description 4
- NWGKJDSIEKMTRX-AAZCQSIUSA-N Sorbitan monooleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O NWGKJDSIEKMTRX-AAZCQSIUSA-N 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 3
- SJWFXCIHNDVPSH-UHFFFAOYSA-N octan-2-ol Chemical compound CCCCCCC(C)O SJWFXCIHNDVPSH-UHFFFAOYSA-N 0.000 claims description 3
- 238000011161 development Methods 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 description 8
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- 239000000377 silicon dioxide Substances 0.000 description 7
- KBPLFHHGFOOTCA-UHFFFAOYSA-N 1-Octanol Chemical group CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 description 6
- 230000035699 permeability Effects 0.000 description 6
- 239000011435 rock Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
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- 239000011734 sodium Substances 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 3
- JRZJOMJEPLMPRA-UHFFFAOYSA-N 1-nonene Chemical compound CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
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- 230000009471 action Effects 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
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- 239000003129 oil well Substances 0.000 description 2
- 229920000056 polyoxyethylene ether Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000012224 working solution Substances 0.000 description 2
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229940051841 polyoxyethylene ether Drugs 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000012360 testing method Methods 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
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
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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
- C09K8/584—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 surfactants
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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
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Silicon Compounds (AREA)
Abstract
The invention discloses a super-hydrophobic hydrolysis water locking agent for relieving gas well water locking injury, a preparation method and a filling process, and relates to the technical field of oil gas development, wherein the super-hydrophobic hydrolysis water locking agent for relieving gas well water locking injury comprises the following components: 1-2% of super-hydrophobic modified nano silicon dioxide particles, 1.5-3% of surfactant, 0.5-1% of emulsifier, 0.5-2.5% of penetrating agent, 0.1-0.5% of foam inhibitor and 20-30% of cosolvent; the hydrophobic modifier of the super-hydrophobic modified nano silicon dioxide particles is tridecafluorooctyl triethoxysilane or heptadecafluorodecyl triethoxysilane; surfactants include fluorocarbon type surfactants and biosurfactants. The invention also discloses a preparation method and a filling process of the super-hydrophobic hydrolysis water locking agent for relieving the water locking injury of the gas well.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to a super-hydrophobic hydrolysis water locking agent for relieving gas well water locking injury, a preparation method and a filling process.
Background
Low permeability and tight gas reservoirs become key fields of exploration and development, but because the low permeability gas reservoirs generally have the characteristics of small pore throats, poor permeability, serious heterogeneity and the like, during the well drilling and completion process, external well-entering working fluid enters the gas reservoirs under the action of capillary force, the water saturation of near-well reservoirs is increased, meanwhile, water-sensitive mineral components of the reservoirs absorb water or swell by hydration to block airflow channels, the gas-phase permeability is reduced, water-locking damage of the gas well reservoirs is formed, and the flowback rate of the external well-entering working fluid is low (generally less than 50%). Thus, the main content of reservoir protection during drilling and completion of tight gas reservoirs is to prevent water lock damage to the reservoir.
The current domestic development and application of the water-unlocking locking agent for well flushing fluid, completion fluid and fracturing fluid have few results and are also the current research hot spot. Chinese patent CN105733543A is a water-unlocking agent for relieving the water-locking injury of low-water-content oil wells, and the water-unlocking agent is composed of nano silicon dioxide with the original granularity of 15-30 nm and ethylene glycol monobutyl ether. The water unlocking agent adopts nano silicon dioxide to enhance the hydrophilicity of the rock surface, so that free water is adsorbed to the rock surface to form a water film, and the relative permeability of oil phase is increased. The water unlocking agent further enhances the hydrophilic property of rock, and in the water flooding process, the capillary force is changed into oil flooding power, and if the water unlocking agent is used for a gas well, the damage of reservoir water locking is further aggravated, so that the water unlocking agent can only be used for oil well water unlocking.
CN202010373281.0, an unlocking agent for reservoir protection drilling fluid, and a preparation method and a use method thereof, adopt a cationic fluorocarbon surfactant or a non-ionic fluorocarbon surfactant type amphiphobic surfactant as a main component of the unlocking agent, although the surfactant type unlocking agent is easy to prepare, the effective period of action is shorter because the surfactant has weaker anti-scouring capability, only the permeability recovery rate of a tight sandstone gas reservoir is improved by about 10%, the effect of alleviating the damage of the tight sandstone gas reservoir by 'water locking' is not obvious, and the engineering practical requirements are difficult to be met.
Therefore, in order to improve the performance of the water-unlocking agent, the wettability of the rock needs to be changed, the surface tension is reduced, the water-locking effect caused by capillary pressure is reduced, and the purpose of improving the flowback rate of external working fluid is achieved.
Disclosure of Invention
The super-hydrophobic hydrolysis water locking agent solves the problems that in the prior art, the effect of a surfactant water locking agent is not ideal, and the flowback rate of a compact sandstone gas well external working solution is low, and provides a super-hydrophobic hydrolysis water locking agent for relieving gas well water locking injuries, wherein the flowback rate of the compact sandstone gas reservoir external well-entering working solution is improved to more than 80% by changing the wettability of rocks and reducing the surface tension.
The invention also discloses a preparation method and a filling process of the super-hydrophobic hydrolysis water locking agent for relieving the water locking injury of the gas well.
In order to achieve the above object, the present application provides the following technical solutions: the super-hydrophobic hydrolysis water locking agent for relieving the gas well water locking injury comprises the following components in percentage by mass: 1-2% of super-hydrophobic modified nano silicon dioxide particles, 1.5-3% of surfactant, 0.5-1% of emulsifier, 0.5-2.5% of penetrating agent, 0.1-0.5% of foam inhibitor, 20-30% of cosolvent and the balance of water;
further, the particle size of the super-hydrophobic modified nano silicon dioxide particles is 5-30 nm, and the hydrophobic modifier of the super-hydrophobic modified nano silicon dioxide particles is tridecafluorooctyl triethoxysilane or heptadecafluorodecyl triethoxysilane;
further, the emulsifier is one or more of sodium dodecyl benzene sulfonate, sodium dodecyl sulfonate, cetyl ammonium bromide, span80, triton X-100 and OP-10;
further, the surfactant comprises a fluorocarbon type surfactant and a biosurfactant, wherein the mass ratio of the fluorocarbon type surfactant to the biosurfactant is 1-2: 1, wherein the fluorocarbon type surfactant is any one of perfluorononenoxybenzenesulfonic acid sodium or perfluorooctyl polyether type surfactant, and the biosurfactant is any one of rhamnolipid, lipopeptide, sophorolipid or xanthan gum biological molecule;
further, the penetrating agent is one or more of alkylphenol ethoxylates and secondary octanol ethoxylates;
further, the foam inhibitor is at least one of polysiloxane and polyether ester;
further, the cosolvent comprises 95% ethanol and 5% sodium dodecyl sulfate by mass.
The preparation method of the super-hydrophobic hydrolysis water locking agent for relieving the gas well water locking injury comprises the following steps:
s1) preparing a nano silicon dioxide precursor: adding nano silicon dioxide into absolute ethyl alcohol, stirring and dispersing, then adding diethylenetriamine and methyl acrylate, stirring and uniformly mixing, slowly dropwise adding ammonia water, stirring and reacting completely, and then centrifuging and drying to obtain a nano silicon dioxide precursor;
s2) dispersing the nano silicon dioxide precursor in absolute ethyl alcohol, adding a hydrophobic modifier, stirring and dispersing uniformly, heating to 50-65 ℃, and continuing stirring and dispersing for 30-90 min to obtain super-hydrophobic modified nano silicon dioxide particles;
s3) taking 1/2 of the surfactant and the cosolvent according to the formula, and adding the super-hydrophobic modified nano silicon dioxide particles into the surfactant and the cosolvent to perform ultrasonic stirring dispersion to obtain a pre-dispersion liquid;
s4) adding the residual 1/2 of the surfactant, the cosolvent, the emulsifier, the penetrating agent and the water into the pre-dispersion liquid obtained in the step S3), and stirring and dispersing to obtain the super-hydrophobic hydrolysis water locking agent for relieving the damage of the well water lock.
Further, the mass ratio of the nano silicon dioxide precursor to the hydrophobic modifier to the absolute ethyl alcohol is 1: 1.5-4:20-50.
The super-hydrophobic nano water-unlocking locking agent disclosed or prepared in the technical scheme is injected into a stratum through an oil pipe by adopting a high-pressure pump truck, the injection amount is designed according to the thickness and the blocking removal radius of a reservoir, the injection amount is 1.5-3 times of the pore volume of the reservoir, after the injection is completed, the aging time is 50-72 h, the well is opened for flowback, the construction is repeated for 2-3 times according to the gas production and water production changes of the gas well, and the flowback rate of external working fluid reaches more than 80%.
Compared with the prior art, the invention has the following beneficial effects:
the application discloses a super-hydrophobic hydrolysis water locking agent for relieving gas well water locking injury, a preparation method and a filling process, wherein a hydrophobic modifier with good hydrophobicity is adopted to modify nano silicon dioxide particles, so that the super-hydrophobic modified nano silicon dioxide particles are obtained, the water locking agent shows super-hydrophobic performance, the surface energy of a stratum is reduced, and the water locking performance of the water locking agent is improved. In addition, the water unlocking agent disclosed by the application improves the water unlocking effect through the synergistic effect of the biosurfactant and the fluorocarbon surfactant, and simultaneously improves the anti-interference capability of the water unlocking agent, so that the applicability of the water unlocking agent is wider. The water-unlocking agent prepared by the method is characterized in that the surfactant and the cosolvent are divided into two in the preparation process, the super-hydrophobic modified nano silicon dioxide particles are pre-dispersed, so that the super-hydrophobic modified nano silicon dioxide particles have good dispersion effect, agglomeration of the super-hydrophobic modified nano silicon dioxide particles is reduced, and the water-unlocking agent is prepared according to a formula, so that the obtained water-unlocking agent has good dispersion and water-unlocking performance and can be fully reflected. The water unlocking agent prepared by the method can improve the flowback rate of the working fluid entering the well from the outside of the tight sandstone gas reservoir to more than 80%.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should not be construed that the scope of the above subject matter of the present invention is limited to the following embodiments, and all techniques realized based on the present invention are within the scope of the present invention.
The super-hydrophobic hydrolysis water locking agent for relieving the gas well water locking injury comprises the following components in percentage by mass: 1-2% of super-hydrophobic modified nano silicon dioxide particles, 1.5-3% of surfactant, 0.5-1% of emulsifier, 0.5-2.5% of penetrating agent, 0.1-0.5% of foam inhibitor, 20-30% of cosolvent and the balance of water;
further, the particle size of the super-hydrophobic modified nano silicon dioxide particles is 5-30 nm, and the hydrophobic modifier of the super-hydrophobic modified nano silicon dioxide particles is tridecafluorooctyl triethoxysilane or heptadecafluorodecyl triethoxysilane;
further, the emulsifier is one or more of sodium dodecyl benzene sulfonate, sodium dodecyl sulfonate, cetyl ammonium bromide, span80, triton X-100 and OP-10;
further, the surfactant comprises a fluorocarbon type surfactant and a biosurfactant, wherein the mass ratio of the fluorocarbon type surfactant to the biosurfactant is 1-2: 1, wherein the fluorocarbon type surfactant is any one of perfluorononenoxybenzenesulfonic acid sodium or perfluorooctyl polyether type surfactant, and the biosurfactant is any one of rhamnolipid, lipopeptide, sophorolipid or xanthan gum biological molecule;
further, the penetrating agent is one or more of alkylphenol ethoxylates and secondary octanol ethoxylates;
further, the foam inhibitor is at least one of polysiloxane and polyether ester;
further, the cosolvent comprises 95% ethanol and 5% sodium dodecyl sulfate by mass.
The invention also discloses a preparation method of the super-hydrophobic hydrolysis water locking agent for relieving the water locking injury of the gas well, which comprises the following steps:
s1) preparing super-hydrophobic modified nano silicon dioxide particles;
s2) taking 1/2 of surfactant and cosolvent according to the formula, and adding modified nano silicon dioxide particles into the surfactant and the cosolvent to perform ultrasonic stirring dispersion to obtain pre-dispersion liquid;
and S3) adding the rest of surfactant, cosolvent, emulsifier, penetrating agent and water into the pre-dispersion liquid, and stirring and dispersing to obtain the super-hydrophobic nano water-unlocking agent.
In the technical scheme, the surfactant and the cosolvent are divided into two parts, and the super-hydrophobic modified nano silicon dioxide particles are pre-dispersed, so that the super-hydrophobic modified nano silicon dioxide particles have good dispersing effect, agglomeration of the super-hydrophobic modified nano silicon dioxide particles is reduced, and the super-hydrophobic modified nano silicon dioxide particles are configured according to a formula, so that the obtained water unlocking agent has good dispersibility and water unlocking performance can be fully reflected.
Further, the step S1) specifically includes the following steps:
s11) preparing a nano silica precursor:
adding nano silicon dioxide into absolute ethyl alcohol, stirring and dispersing, then adding diethylenetriamine and methyl acrylate, stirring and uniformly mixing, slowly dropwise adding ammonia water, stirring and reacting completely, and then centrifuging and drying to obtain a nano silicon dioxide precursor;
s12) dispersing the nano silicon dioxide precursor in the medium absolute ethyl alcohol, adding the hydrophobic modifier, stirring and dispersing uniformly, heating to 50-65 ℃, and continuing stirring and dispersing for 30-90 min to obtain the super-hydrophobic nano silicon dioxide particles; further, the mass ratio of the nano silicon dioxide precursor to the hydrophobic modifier to the absolute ethyl alcohol is 1: 1.5-4:20-50.
The super-hydrophobic nano water-unlocking locking agent disclosed or prepared in the technical scheme is injected into a stratum through an oil pipe by adopting a high-pressure pump truck, the injection amount is designed according to the thickness and the blocking removal radius of a reservoir, the injection amount is 1.5-3 times of the pore volume of the reservoir, after the injection is completed, the aging time is 50-72 h, the well is opened for flowback, the construction is repeated for 2-3 times according to the gas production and water production changes of the gas well, and the flowback rate of external working fluid reaches more than 80%.
Example 1
The water-unlocking agent is prepared by adopting the following formula, wherein the formula comprises the following components in percentage by mass: 1% of super-hydrophobic modified nano silicon dioxide particles, 1% of perfluor nonenoxybenzene sodium sulfonate, 0.5% of xanthan gum biological molecules, 0.5% of OP-10.5% of alkylphenol ethoxylates, 0.1% of polysiloxane, 20% of cosolvent and the balance of water. Wherein the cosolvent is 95% ethanol and 5% sodium dodecyl sulfate.
The water unlocking agent is prepared by the following method:
s1) preparing super-hydrophobic modified nano silicon dioxide particles;
s11) preparing a nano silica precursor:
adding nano silicon dioxide into absolute ethyl alcohol, stirring and dispersing, then adding diethylenetriamine and methyl acrylate, stirring and uniformly mixing, slowly dropwise adding ammonia water, stirring and reacting completely, and then centrifuging and drying to obtain a nano silicon dioxide precursor;
s12) taking a nano silicon dioxide precursor, tridecafluorooctyl triethoxysilane and absolute ethyl alcohol according to the mass ratio of 1:1.5:20, dispersing the nano silicon dioxide precursor in the absolute ethyl alcohol, adding the tridecafluorooctyl triethoxysilane, stirring and dispersing uniformly, heating to 50 ℃, continuing stirring and dispersing for 90min, and stirring at the speed of 300r/min to obtain the super-hydrophobic nano silicon dioxide particles.
S2) taking 1/2 of surfactant and cosolvent according to the formula, and adding modified nano silicon dioxide particles into the surfactant and the cosolvent to perform ultrasonic stirring dispersion to obtain pre-dispersion liquid;
and S3) adding the rest of surfactant, cosolvent, emulsifier, penetrating agent and water into the pre-dispersion liquid, and stirring and dispersing to obtain the super-hydrophobic nano water-unlocking agent A.
Injecting the super-hydrophobic nano water unlocking agent A into a gas well X1 by adopting a high-pressure pump truck, wherein the flowback rate of the fracturing fluid of the well before injection is 38.6%; the injection pressure is 11.7-13.5 MPa, the discharge capacity is 6 m/h, the injection amount is 3.45 tons, the pore volume is 1.6 times, the well closing aging reaction is 50h, the well opening flowback is carried out, the construction is repeated for 2 times, and the fracturing fluid flowback rate is 81.7%.
Example 2
The water-unlocking agent is prepared by adopting the following formula, wherein the formula comprises the following components in percentage by mass: 1.5% of super-hydrophobic modified nano silicon dioxide particles, 1% of perfluor nonene oxybenzene sodium sulfonate, 0.5% of rhamnolipid, 0.5% of sodium dodecyl benzene sulfonate, 2.5% of sec-octyl alcohol polyoxyethylene ether, 0.5% of polysiloxane, 30% of cosolvent and the balance of water. Wherein the cosolvent is 95% ethanol and 5% sodium dodecyl sulfate.
The water unlocking agent is prepared by the following method:
s1) preparing super-hydrophobic modified nano silicon dioxide particles;
s11) preparing a nano silica precursor:
adding nano silicon dioxide into absolute ethyl alcohol, stirring and dispersing, then adding diethylenetriamine and methyl acrylate, stirring and uniformly mixing, slowly dropwise adding ammonia water, stirring and reacting completely, and then centrifuging and drying to obtain a nano silicon dioxide precursor;
s12) taking a nano silicon dioxide precursor, heptadecafluorodecyl triethoxysilane and absolute ethyl alcohol according to the mass ratio of 1:4:50, dispersing the nano silicon dioxide precursor in the absolute ethyl alcohol, adding the heptadecafluorodecyl triethoxysilane, stirring and dispersing uniformly, heating to 65 ℃, continuing stirring and dispersing for 30min, and stirring at the speed of 400r/min to obtain the super-hydrophobic nano silicon dioxide particles.
S2) taking 1/2 of surfactant and cosolvent according to the formula, and adding the modified nano silicon dioxide particles into the water surfactant and the cosolvent to carry out ultrasonic stirring and dispersion to obtain pre-dispersion liquid;
and S3) adding the rest of surfactant, cosolvent, emulsifier, penetrating agent and water into the pre-dispersion liquid, and stirring and dispersing to obtain the super-hydrophobic nano water-unlocking agent B.
Injecting the super-hydrophobic nano water unlocking agent B into a gas well X2 by adopting a high-pressure pump truck, wherein the flowback rate of the fracturing fluid of the well before injection is 43.2%; the injection pressure is 15.2-18.6 MPa, the discharge capacity is 6 m/h, the injection amount is 3.62 tons, the pore volume is 2.1 times, the well closing aging reaction is 60h, the well opening flowback is carried out, the construction is repeated for 3 times, and the flowback rate of the fracturing fluid is 85.2%.
Example 3
The water-unlocking agent is prepared by adopting the following formula, wherein the formula comprises the following components in percentage by mass: 2% of super-hydrophobic modified nano silicon dioxide particles, 1% of perfluorooctyl polyether surfactant, 0.5% of lipopeptide, 0.8% of sodium dodecyl sulfonate, 1.2% of alkylphenol ethoxylates, 0.4% of polyether ester, 25% of cosolvent and the balance of water. Wherein the cosolvent is 95% ethanol and 5% sodium dodecyl sulfate.
The water unlocking agent is prepared by the following method:
s1) preparing super-hydrophobic modified nano silicon dioxide particles;
s11) preparing a nano silica precursor:
adding nano silicon dioxide into absolute ethyl alcohol, stirring and dispersing, then adding diethylenetriamine and methyl acrylate, stirring and uniformly mixing, slowly dropwise adding ammonia water, stirring and reacting completely, and then centrifuging and drying to obtain a nano silicon dioxide precursor;
s12) according to the mass ratio of 1:2:35, dispersing the nano silicon dioxide precursor in the absolute ethyl alcohol, adding the heptadecafluorodecyltriethoxysilane, stirring and dispersing uniformly, heating to 60 ℃, continuously stirring and dispersing for 50min, wherein the stirring speed is 350r/min, and obtaining the super-hydrophobic nano silicon dioxide particles.
S2) taking 1/2 of surfactant and cosolvent according to the formula, and adding modified nano silicon dioxide particles into the surfactant and the cosolvent to perform ultrasonic stirring dispersion to obtain pre-dispersion liquid;
and S3) adding the rest of surfactant, cosolvent, emulsifier, penetrating agent and water into the pre-dispersion liquid, and stirring and dispersing to obtain the super-hydrophobic nano water-unlocking agent C.
Injecting the super-hydrophobic nano water unlocking agent C into a gas well X3 by adopting a high-pressure pump truck, wherein the flowback rate of the fracturing fluid of the well before injection is 51.7%; the injection pressure is 16.3-17.4 MPa, the discharge capacity is 6 m/h, the injection amount is 2.72 tons, the pore volume is 1.7 times, the well closing aging reaction is 60h, the well opening flowback is carried out, the construction is repeated for 1 time, and the flowback rate of the fracturing fluid is 86.4%.
Example 4
The water-unlocking agent is prepared by adopting the following formula, wherein the formula comprises the following components in percentage by mass: 2% of super-hydrophobic modified nano silicon dioxide particles, 1% of perfluor nonenoxybenzene sodium sulfonate, 1% of sophorolipid, 1% of cetyl ammonium bromide, 1% of alkylphenol ethoxylates, 1.5% of secondary octanol ethoxylates, 0.2% of polysiloxane, 0.3% of polyether ester, 25% of cosolvent and the balance of water. Wherein the cosolvent is 95% ethanol and 5% sodium dodecyl sulfate.
The water unlocking agent is prepared by the following method:
s1) preparing super-hydrophobic modified nano silicon dioxide particles;
s11) preparing a nano silica precursor:
adding nano silicon dioxide into absolute ethyl alcohol, stirring and dispersing, then adding diethylenetriamine and methyl acrylate, stirring and uniformly mixing, slowly dropwise adding ammonia water, stirring and reacting completely, and then centrifuging and drying to obtain a nano silicon dioxide precursor;
s12) according to the mass ratio of 1:2:35, dispersing the nano silicon dioxide precursor, tridecafluorooctyl triethoxysilane and absolute ethyl alcohol in the absolute ethyl alcohol, adding tridecafluorooctyl triethoxysilane, stirring and dispersing uniformly, heating to 60 ℃, continuously stirring and dispersing for 50min, wherein the stirring speed is 350r/min, and obtaining the super-hydrophobic nano silicon dioxide particles.
S2) taking 1/2 of surfactant and cosolvent according to the formula, and adding modified nano silicon dioxide particles into the surfactant and the cosolvent to perform ultrasonic stirring dispersion to obtain pre-dispersion liquid;
and S3) adding the rest of surfactant, cosolvent, emulsifier, penetrating agent and water into the pre-dispersion liquid, and stirring and dispersing to obtain the super-hydrophobic nano water-unlocking agent D.
Injecting the super-hydrophobic nano water unlocking agent D into a gas well X4 by adopting a high-pressure pump truck, wherein the flowback rate of the fracturing fluid of the well before injection is 47.3%; the injection pressure is 18.1-22.5 MPa, the discharge capacity is 6 m/h, the injection amount is 2.72 tons, the pore volume is 1.5 times, the well closing aging reaction is 60h, the well opening flowback is carried out, the construction is repeated for 2 times, and the fracturing fluid flowback rate is 82.7%.
Example 5
The water-unlocking agent is prepared by adopting the following formula, wherein the formula comprises the following components in percentage by mass: 2% of super-hydrophobic modified nano silicon dioxide particles, 1.5% of perfluorooctyl polyether surfactant, 0.8% of rhamnolipid, 0.6% of TritonX-100, 1.2% of alkylphenol ethoxylates, 0.4% of polysiloxane, 25% of cosolvent and the balance of water. Wherein the cosolvent is 95% ethanol and 5% sodium dodecyl sulfate.
The water unlocking agent is prepared by the following method:
s1) preparing super-hydrophobic modified nano silicon dioxide particles;
s11) preparing a nano silica precursor:
adding nano silicon dioxide into absolute ethyl alcohol, stirring and dispersing, then adding diethylenetriamine and methyl acrylate, stirring and uniformly mixing, slowly dropwise adding ammonia water, stirring and reacting completely, and then centrifuging and drying to obtain a nano silicon dioxide precursor;
s12) according to the mass ratio of 1:2:50, dispersing the nano silicon dioxide precursor, tridecafluorooctyl triethoxysilane and absolute ethyl alcohol in the absolute ethyl alcohol, adding tridecafluorooctyl triethoxysilane, stirring and dispersing uniformly, heating to 60 ℃, continuously stirring and dispersing for 50min, wherein the stirring speed is 350r/min, and obtaining the super-hydrophobic nano silicon dioxide particles.
S2) taking 1/2 of the super-surfactant and the cosolvent according to the formula, and adding the modified nano-silica particles into the surfactant and the cosolvent to perform ultrasonic stirring and dispersion to obtain a pre-dispersion liquid;
and S3) adding the rest of surfactant, cosolvent, emulsifier, penetrating agent and water into the pre-dispersion liquid, and stirring and dispersing to obtain the super-hydrophobic nano water-unlocking agent E.
Injecting the super-hydrophobic nano water unlocking agent E into a gas well X5 by adopting a high-pressure pump truck, wherein the flowback rate of the fracturing fluid of the well before injection is 36.9%; the injection pressure is 21.4-26.7 MPa, the discharge capacity is 6 m/h, the injection amount is 4.15 tons, the pore volume is 1.7 times, the well closing aging reaction is 60h, the well opening flowback is carried out, the construction is repeated for 1 time, and the flowback rate of the fracturing fluid is 83.1%.
Example 6
The water-unlocking agent is prepared by adopting the following formula, wherein the formula comprises the following components in percentage by mass: 2% of super-hydrophobic modified nano silicon dioxide particles, 1.5% of perfluorooctyl polyether surfactant, 1.5% of sophorolipid, 0.5% of TritonX-100, 0.5% of OP-10, 0.3% of alkylphenol ethoxylates, 0.5% of sec-octanol polyoxyethylene ethers, 0.1% of polysiloxane, 0.2% of polyether esters, 25% of cosolvent and the balance of water. Wherein the cosolvent is 95% ethanol and 5% sodium dodecyl sulfate.
The water unlocking agent is prepared by the following method:
s1) preparing super-hydrophobic modified nano silicon dioxide particles;
s11) preparing a nano silica precursor:
adding nano silicon dioxide into absolute ethyl alcohol, stirring and dispersing, then adding diethylenetriamine and methyl acrylate, stirring and uniformly mixing, slowly dropwise adding ammonia water, stirring and reacting completely, and then centrifuging and drying to obtain a nano silicon dioxide precursor;
s12) according to the mass ratio of 1:2:35, dispersing the nano silicon dioxide precursor in the absolute ethyl alcohol, adding the heptadecafluorodecyltriethoxysilane, stirring and dispersing uniformly, heating to 60 ℃, continuously stirring and dispersing for 50min, wherein the stirring speed is 350r/min, and obtaining the super-hydrophobic nano silicon dioxide particles.
S2) taking 1/2 of surfactant and cosolvent according to the formula, and adding modified nano silicon dioxide particles into the surfactant and the cosolvent to perform ultrasonic stirring dispersion to obtain pre-dispersion liquid;
and S3) adding the rest of surfactant, cosolvent, emulsifier, penetrating agent and water into the pre-dispersion liquid, and stirring and dispersing to obtain the super-hydrophobic nano water-unlocking agent F.
And (3) injecting the super-hydrophobic nano water-unlocking locking agent F into a gas well X6 by adopting a high-pressure pump truck, wherein the flowback rate of the fracturing fluid of the well before injection is 42.7%. The injection pressure is 12.6-15.2 MPa, the discharge capacity is 6 m/h, the injection amount is 3.74 tons, the pore volume is 2.8 times, the well closing aging reaction is 72h, the well opening and the flowback are carried out, the construction is repeated for 1 time, and the flowback rate of the fracturing fluid is 88.7%.
Comparative example:
comparative example 1
The water-unlocking agent is prepared by adopting the following formula, wherein the formula comprises the following components in percentage by mass: 1.5% of perfluorooctyl polyether surfactant, 1% of xanthan gum biological molecule, 0.8% of OP-10, 1.2% of alkylphenol ethoxylates, 0.4% of polysiloxane, 25% of cosolvent and the balance of water. Wherein the cosolvent is 95% ethanol and 5% sodium dodecyl sulfate.
The above ingredients were formulated directly into the water-lock releasing agent sample 1.
And (3) injecting the water-unlocking locking agent sample 1 into a gas well X7 by adopting a high-pressure pump truck, wherein the flowback rate of the fracturing fluid of the well before injection is 48.1%. The injection pressure is 13.2-14.8 MPa, the discharge capacity is 6m o/h, the injection amount is 2.63 tons (the pore volume is 2.2 times), the well is closed, the aging reaction is 72h, the well is opened, the flow back is carried out, the construction is repeated for 3 times, and the flow back rate of the fracturing fluid is 54.6%.
Comparative example 2
The water-unlocking agent is prepared by adopting the following formula, wherein the formula comprises the following components in percentage by mass: 1% of modified nano silicon dioxide particles, 0.8% of OP-10, 1.2% of alkylphenol ethoxylates, 0.4% of polysiloxane, 25% of cosolvent and the balance of water. Wherein the cosolvent is 95% ethanol and 5% sodium dodecyl sulfate.
The water unlocking agent is prepared by the following method:
s1) preparing super-hydrophobic modified nano silicon dioxide particles; and (3) taking nano silicon dioxide, tridecafluorooctyl triethoxysilane and absolute ethyl alcohol according to the mass ratio of 1:2:35, dispersing a nano silicon dioxide precursor in the absolute ethyl alcohol, adding tridecafluorooctyl triethoxysilane, stirring and dispersing uniformly, heating to 60 ℃, continuing stirring and dispersing for 50min, and obtaining modified nano silicon dioxide particles with the stirring speed of 350 r/min.
S2) taking 1/2 of cosolvent according to the formula, and adding modified nano silicon dioxide particles into a surfactant and the cosolvent to perform ultrasonic stirring dispersion to obtain a pre-dispersion liquid;
and S3) adding the rest cosolvent, the emulsifier, the penetrating agent and the water into the pre-dispersion liquid, and stirring and dispersing to obtain a water unlocking agent sample 2.
Injecting a water unlocking locking agent sample 2 into a gas well X8 by adopting a high-pressure pump truck, wherein the flowback rate of the fracturing fluid of the well before injection is 51.8%; the injection pressure is 16.6-18.3 MPa, the discharge capacity is 6 m/h, the injection amount is 3.17 tons, the pore volume is 2.7 times, the well closing aging reaction is 72h, the well opening and the flowback are carried out, the construction is repeated for 2 times, and the flowback rate of the fracturing fluid is 61.3%.
The water unlocking agents prepared in the examples 1-6 and the comparative examples 1-2 are respectively measured to obtain the simulated stratum water contact angle with the surface tension and the mineralization degree of 10000mg/L, and the measurement results show that the lower the tension is, the larger the contact angle is, the higher the flowback rate of the external well entering liquid is, so that the purpose of knowing the water lock of the degassing well is achieved, and the results are as follows:
TABLE 1 Water-unlocking effect of the products
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (4)
1. A super-hydrophobic hydrolysis water locking agent for relieving gas well water locking injury is characterized in that: comprises the following components in percentage by mass: 1-2% of super-hydrophobic modified nano silicon dioxide particles, 1.5-3% of surfactant, 0.5-1% of emulsifier, 0.5-2.5% of penetrating agent, 0.1-0.5% of foam inhibitor, 20-30% of cosolvent and the balance of water;
the particle size of the super-hydrophobic modified nano silicon dioxide particles is 5-30 nm, and the hydrophobic modifier of the super-hydrophobic modified nano silicon dioxide particles is tridecafluorooctyl triethoxysilane or heptadecafluorodecyl triethoxysilane;
the emulsifier is one or more of sodium dodecyl benzene sulfonate, sodium dodecyl sulfonate, hexadecyl ammonium bromide, span80, tritonX-100 and OP-10;
the surfactant comprises a fluorocarbon type surfactant and a biosurfactant, wherein the mass ratio of the fluorocarbon type surfactant to the biosurfactant is 1-2: 1, wherein the fluorocarbon type surfactant is any one of perfluorononenoxybenzenesulfonic acid sodium or perfluorooctyl polyether type surfactant, and the biosurfactant is any one of rhamnolipid, lipopeptide, sophorolipid or xanthan gum biological molecule;
the penetrating agent is one or more of alkylphenol ethoxylates and sec-octanol ethoxylates;
the foam inhibitor is at least one of polysiloxane and polyether ester;
the cosolvent comprises 95% ethanol and 5% sodium dodecyl sulfate by mass fraction.
2. A preparation method of a super-hydrophobic hydrolysis water locking agent for relieving gas well water locking injury is characterized by comprising the following steps: the method for preparing the super-hydrophobic hydrolysis water locking agent for removing the water locking injury of a gas well by using the method for preparing the super-hydrophobic hydrolysis water locking agent comprises the following steps:
s1) preparing a nano silicon dioxide precursor: adding nano silicon dioxide into absolute ethyl alcohol, stirring and dispersing, then adding diethylenetriamine and methyl acrylate, stirring and uniformly mixing, slowly dropwise adding ammonia water, stirring and reacting completely, and then centrifuging and drying to obtain a nano silicon dioxide precursor;
s2) dispersing the nano silicon dioxide precursor in absolute ethyl alcohol, adding a hydrophobic modifier, stirring and dispersing uniformly, heating to 50-65 ℃, and continuing stirring and dispersing for 30-90 min to obtain super-hydrophobic modified nano silicon dioxide particles;
s3) taking 1/2 of the surfactant and the cosolvent according to the formula, and adding the super-hydrophobic modified nano silicon dioxide particles into the surfactant and the cosolvent to perform ultrasonic stirring dispersion to obtain a pre-dispersion liquid;
s4) adding the residual 1/2 of the surfactant, the cosolvent, the emulsifier, the penetrating agent and the water into the pre-dispersion liquid obtained in the step S3), and stirring and dispersing to obtain the super-hydrophobic hydrolysis water locking agent for relieving the damage of the well water lock.
3. The method for preparing the super-hydrophobic hydrolysis water locking agent for removing the water locking injury of a gas well according to claim 2, which is characterized by comprising the following steps: the mass ratio of the nano silicon dioxide precursor to the hydrophobic modifier to the absolute ethyl alcohol is 1: 1.5-4:20-50.
4. A filling process of a super-hydrophobic hydrolysis water locking agent for relieving gas well water locking injury is characterized by comprising the following steps of: the super-hydrophobic nano water unlocking agent disclosed or prepared in the technical scheme is injected into a stratum through an oil pipe by adopting a high-pressure pump truck, the injection quantity is designed according to the thickness and the blocking removal radius of a reservoir, the injection quantity is 1.5-3 times of the pore volume of the reservoir, after the injection is completed, the aging time is 50-72 h, the well is opened for flowback, and the construction is repeated for 2-3 times according to the gas production and the water production change of a gas well until the flowback rate of external working fluid reaches more than 80%.
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