CN108102633B - Viscoelastic acid-based fracturing fluid and preparation method thereof - Google Patents
Viscoelastic acid-based fracturing fluid and preparation method thereof Download PDFInfo
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- 239000002253 acid Substances 0.000 title claims abstract description 107
- 239000012530 fluid Substances 0.000 title claims abstract description 100
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- -1 ion salt Chemical class 0.000 claims abstract description 42
- 239000002562 thickening agent Substances 0.000 claims abstract description 36
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000003381 stabilizer Substances 0.000 claims abstract description 32
- 230000007797 corrosion Effects 0.000 claims abstract description 20
- 238000005260 corrosion Methods 0.000 claims abstract description 20
- 239000003112 inhibitor Substances 0.000 claims abstract description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052742 iron Inorganic materials 0.000 claims abstract description 18
- 239000000203 mixture Substances 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 43
- REZZEXDLIUJMMS-UHFFFAOYSA-M dimethyldioctadecylammonium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCCCC[N+](C)(C)CCCCCCCCCCCCCCCCCC REZZEXDLIUJMMS-UHFFFAOYSA-M 0.000 claims description 14
- 150000002500 ions Chemical class 0.000 claims description 13
- 230000002378 acidificating effect Effects 0.000 claims description 10
- YSJGOMATDFSEED-UHFFFAOYSA-M behentrimonium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCCCCCCCC[N+](C)(C)C YSJGOMATDFSEED-UHFFFAOYSA-M 0.000 claims description 10
- MRUAUOIMASANKQ-UHFFFAOYSA-O carboxymethyl-[3-(dodecanoylamino)propyl]-dimethylazanium Chemical compound CCCCCCCCCCCC(=O)NCCC[N+](C)(C)CC(O)=O MRUAUOIMASANKQ-UHFFFAOYSA-O 0.000 claims description 9
- MTNDZQHUAFNZQY-UHFFFAOYSA-N imidazoline Chemical compound C1CN=CN1 MTNDZQHUAFNZQY-UHFFFAOYSA-N 0.000 claims description 9
- 229940075468 lauramidopropyl betaine Drugs 0.000 claims description 9
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 8
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 6
- 235000019333 sodium laurylsulphate Nutrition 0.000 claims description 6
- NPFOYSMITVOQOS-UHFFFAOYSA-K iron(III) citrate Chemical compound [Fe+3].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NPFOYSMITVOQOS-UHFFFAOYSA-K 0.000 claims description 5
- 150000003839 salts Chemical class 0.000 claims description 5
- WXMKPNITSTVMEF-UHFFFAOYSA-M sodium benzoate Chemical compound [Na+].[O-]C(=O)C1=CC=CC=C1 WXMKPNITSTVMEF-UHFFFAOYSA-M 0.000 claims description 5
- 239000004299 sodium benzoate Substances 0.000 claims description 5
- 235000010234 sodium benzoate Nutrition 0.000 claims description 5
- 125000002619 bicyclic group Chemical group 0.000 claims description 4
- 235000010350 erythorbic acid Nutrition 0.000 claims description 4
- 229960002413 ferric citrate Drugs 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000001103 potassium chloride Substances 0.000 claims description 4
- 235000011164 potassium chloride Nutrition 0.000 claims description 4
- 239000001273 butane Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 claims description 3
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- HYZJCKYKOHLVJF-UHFFFAOYSA-N 1H-benzimidazole Chemical compound C1=CC=C2NC=NC2=C1 HYZJCKYKOHLVJF-UHFFFAOYSA-N 0.000 claims description 2
- ABBQHOQBGMUPJH-UHFFFAOYSA-M Sodium salicylate Chemical compound [Na+].OC1=CC=CC=C1C([O-])=O ABBQHOQBGMUPJH-UHFFFAOYSA-M 0.000 claims description 2
- WOWHHFRSBJGXCM-UHFFFAOYSA-M cetyltrimethylammonium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCC[N+](C)(C)C WOWHHFRSBJGXCM-UHFFFAOYSA-M 0.000 claims description 2
- ZCPCLAPUXMZUCD-UHFFFAOYSA-M dihexadecyl(dimethyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCC[N+](C)(C)CCCCCCCCCCCCCCCC ZCPCLAPUXMZUCD-UHFFFAOYSA-M 0.000 claims description 2
- 229940026231 erythorbate Drugs 0.000 claims description 2
- 229960002816 potassium chloride Drugs 0.000 claims description 2
- 229960003885 sodium benzoate Drugs 0.000 claims description 2
- 229960004025 sodium salicylate Drugs 0.000 claims description 2
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims 3
- JGVIYCAYGMXJBC-UHFFFAOYSA-N 2-octylpyridine Chemical compound CCCCCCCCC1=CC=CC=N1 JGVIYCAYGMXJBC-UHFFFAOYSA-N 0.000 claims 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 238000002474 experimental method Methods 0.000 description 22
- 239000003350 kerosene Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 239000002131 composite material Substances 0.000 description 6
- 238000007792 addition Methods 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 239000010779 crude oil Substances 0.000 description 4
- 239000008398 formation water Substances 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 229920002907 Guar gum Polymers 0.000 description 3
- 239000003431 cross linking reagent Substances 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000665 guar gum Substances 0.000 description 3
- 229960002154 guar gum Drugs 0.000 description 3
- 235000010417 guar gum Nutrition 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 239000010742 number 1 fuel oil Substances 0.000 description 3
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid group Chemical group C(CCCCCCC\C=C/CCCCCCCC)(=O)O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 230000000638 stimulation Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229940006076 viscoelastic substance Drugs 0.000 description 3
- 239000003190 viscoelastic substance Substances 0.000 description 3
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 2
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 2
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 2
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 2
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Natural products OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 2
- 239000005642 Oleic acid Substances 0.000 description 2
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 229940026239 isoascorbic acid Drugs 0.000 description 2
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 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 description 2
- UOMQUZPKALKDCA-UHFFFAOYSA-K 2-[2-[bis(carboxylatomethyl)amino]ethyl-(carboxymethyl)amino]acetate;iron(3+) Chemical compound [Fe+3].OC(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O UOMQUZPKALKDCA-UHFFFAOYSA-K 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- RCEAADKTGXTDOA-UHFFFAOYSA-N OS(O)(=O)=O.CCCCCCCCCCCC[Na] Chemical compound OS(O)(=O)=O.CCCCCCCCCCCC[Na] RCEAADKTGXTDOA-UHFFFAOYSA-N 0.000 description 1
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012660 binary copolymerization Methods 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- VFEVXBKBGMAKME-UHFFFAOYSA-N butane;hydrobromide Chemical compound Br.CCCC VFEVXBKBGMAKME-UHFFFAOYSA-N 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- HJLHTTJLVALHOP-UHFFFAOYSA-N hexane;hydron;chloride Chemical compound Cl.CCCCCC HJLHTTJLVALHOP-UHFFFAOYSA-N 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- NFXCUPVBISCOSF-UHFFFAOYSA-N propan-2-ol;dihydrochloride Chemical compound Cl.Cl.CC(C)O NFXCUPVBISCOSF-UHFFFAOYSA-N 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/602—Compositions for stimulating production by acting on the underground formation containing 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
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/72—Eroding chemicals, e.g. acids
- C09K8/74—Eroding chemicals, e.g. acids combined with additives added for specific purposes
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/28—Friction or drag reducing additives
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/30—Viscoelastic surfactants [VES]
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
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Abstract
The invention provides a viscoelastic acid-based fracturing fluid and a preparation method thereof. The composition of the viscoelastic acid-based fracturing fluid of the invention comprises: a thickening agent: 2.0-7.5 parts by weight; 31-37 wt.% concentrated hydrochloric acid: 50.0 to 75.0 parts by weight; a counter ion salt: 0.5-2.5 parts by weight; corrosion inhibitor: 0.5-2.5 parts by weight; iron ion stabilizer: 1.5-5.0 parts by weight. The system of the invention is strong acid, high temperature resistant, high viscosity, automatic gel breaking, no residue in gel breaking liquid, and has the advantages of simple raw material, low cost, convenient liquid preparation, etc.
Description
Technical Field
The invention relates to a viscoelastic acid-based fracturing fluid and a preparation method thereof, belonging to the technical field of oil and gas exploitation.
Background
The hydraulic sand-adding composite fracturing technology integrated with fracturing and acidizing can form cracks with high flow conductivity. The conventional fracturing fluid is water-based fracturing fluid, the higher the viscosity of the fracturing fluid is, the better the sand carrying performance is, the water-based fracturing fluid mainly adopts thickening agents of guar gum and a cross-linking agent of borax for cross-linking and the like under an alkaline condition, the molecular weight of the guar gum is more than 100 ten thousand, macromolecular substances of the guar gum are easy to adsorb and retain to block a fluid seepage passage of a reservoir stratum, fracturing fluid residues block a supporting crack, and filter cakes cause damage to the wall surface of the crack. In recent years, a great deal of research work is carried out at home and abroad aiming at the aspects, but the problems of adsorption and retention of macromolecular substances in reservoir pore channels, invasion and damage of alkaline fluid to the reservoir and the like are not solved all the time. In addition, the conventional hydrochloric acid has high acidification speed and short action distance, and the viscosity of the acid solution needs to be improved to reduce the reaction speed of acid rocks.
Yangdong discloses a crosslinked acid-based fracturing fluid system crosslinked acid in a research on a crosslinked acid-based fracturing fluid system (Master academic thesis 2006 of southwest oil university), wherein a route for chemically synthesizing a cationic high-molecular compound as a thickening agent is selected, cheap Acrylamide (AM) and methacryloyloxyethyl trimethyl ammonium chloride (DMC) are used for binary copolymerization to synthesize a novel acid thickener CH-II, and a matched crosslinking agent ZJL and a composite gel breaker DP are developed and optimized on the basis of the developed thickener CH-II. The cross-linked acid-base fracturing fluid system has the advantages of high viscosity, low filtration loss, low friction resistance, easiness in pumping, low acid-rock reaction speed, high joint forming efficiency, easiness in flowback, good rheological property, capability of carrying sand and the like, so that the aims of realizing deep penetration of an acid system, improving the flow conductivity of acid-etched fractures, prolonging the effective period after fracturing and improving the single-well productivity can be fulfilled. However, in the crosslinked acid-based fracturing fluid system, the thickening agent is a polymer high molecular substance and heavy metals such as a crosslinking agent need to be added, so that the damage of the high molecular substance to the stratum cannot be reduced.
Disclosure of Invention
An object of the present invention is to provide a viscoelastic acid-based fracturing fluid that is resistant to high temperatures, has high viscosity, and reduces damage to the formation.
Another object of the present invention is to provide a method for preparing the viscoelastic acid-based fracturing fluid.
In one aspect, the present invention provides a viscoelastic acid-based fracturing fluid composition comprising:
a thickening agent: 2.0-7.5 parts by weight;
31-37 wt.% concentrated hydrochloric acid: 50.0 to 75.0 parts by weight;
a counter ion salt: 0.5-2.5 parts by weight;
corrosion inhibitor: 0.5-2.5 parts by weight;
iron ion stabilizer: 1.5-5.0 parts by weight.
According to a particular embodiment of the invention, the viscoelastic acid-based fracturing fluid composition of the invention further comprises an amount of water such that the sum of the components is 100 parts by weight.
According to a particular embodiment of the invention, the viscoelastic acid-based fracturing fluid composition of the invention, based on 100% of its total weight, comprises the following components:
a thickening agent: 2.0wt.% to 7.5 wt.%;
31-37 wt.% concentrated hydrochloric acid: 50.0wt.% to 75.0 wt.%;
a counter ion salt: 0.5wt.% to 2.5 wt.%;
corrosion inhibitor: 0.5wt.% to 2.5 wt.%;
iron ion stabilizer: 1.5wt.% to 5.0 wt.%;
water: and (4) the balance.
According to a specific embodiment of the present invention, in the viscoelastic acid-based fracturing fluid composition of the present invention, the viscosifying agent may comprise one or more of cetyltrimethylammonium chloride, behenyltrimethylammonium chloride, dicetyldimethylammonium chloride, dioctadecyldimethylammonium chloride, lauramidopropylbetaine. When a mixture of a plurality of components is used as the thickener of the present invention, the components may be mixed in any ratio.
According to a particular embodiment of the invention, in the viscoelastic acid-based fracturing fluid composition of the invention, the counter-ion salt comprises one or more of sodium lauryl sulfate, sodium salicylate, sodium benzoate, potassium chloride. When multiple component counter ion salts are employed, the components can be mixed in any ratio.
According to a particular embodiment of the invention, in the viscoelastic acid-based fracturing fluid composition of the invention, the corrosion inhibitor comprises one or more of 1,6- (a-octylpyridine) hexane chloride, 1, 3-pyridine dichloride-2-hydroxypropane, 1, 4- (a-octylpyridine) butane bromide, oleic imidazoline, bicyclic imidazoline, benzimidazole.
According to a particular embodiment of the invention, in the viscoelastic acid-based fracturing fluid composition of the invention, the iron ion stabilizer comprises one or more of a ferric citrate ion stabilizer, a ferric ethylenediaminetetraacetic acid sodium salt ion stabilizer, and a ferric erythorbate ion stabilizer.
The invention also provides a viscoelastic acid-based fracturing fluid which is prepared from the viscoelastic acid-based fracturing fluid composition.
The invention also provides a method of preparing a viscoelastic acid-based fracturing fluid, the method comprising the steps of:
a. dissolving the thickening agent in water, adding a corrosion inhibitor and an iron ion stabilizer (without limiting the sequence of adding the corrosion inhibitor and the iron ion stabilizer), and then adding concentrated hydrochloric acid to obtain an acidic thickening agent liquid;
b. dissolving a counter ion salt in water to obtain a counter ion solution;
c. and mixing the acidic thickening agent liquid and the counter ion solution, and uniformly stirring to obtain the viscoelastic acid-based fracturing fluid system.
The preparation method of the viscoelastic acid-based fracturing fluid can be carried out at normal temperature and normal pressure.
The viscoelastic acid-based fracturing fluid system is formed by crosslinking a surfactant and a counter-ion salt in an acid solution, has the molecular weight of less than 1000, does not contain any high polymer, is strong in acidity, high-temperature resistance and high in viscosity, can automatically break gel, has no residue in gel breaking liquid, and can realize a hydraulic sand-adding composite fracturing technology integrating fracturing and acidizing The acid etching-supporting composite fracture with longer-term flow conductivity can thoroughly improve the seepage capability of a near-wellbore zone and a near-fracture zone.
Overall, the viscoelastic acid-based fracturing fluid and the preparation method thereof of the invention have the following beneficial effects:
1. the viscoelastic acid-based fracturing fluid provided by the invention can be used for a hydraulic sand-adding composite fracturing technology integrating fracturing and acidizing, can resist a carbonate rock reservoir with the temperature of 90-110 ℃, has the viscosity of 100-180 mPa & s, and can be used for matrix acidizing around an artificial fracture during fracturing, so that the acidizing range is greatly increased, not only can pollution and seepage resistance in a near-wellbore area be relieved, but also a fracture with high flow conductivity as same as that of hydraulic fracturing can be formed, and meanwhile, the damage of the fracturing fluid in a near-fracture wall filtration zone to a stratum can be relieved by acid in the fracturing fluid, so that an acid-etching-supporting composite fracture with higher flow conductivity and longer-period flow conductivity can be formed.
2. The traditional water-based fracturing fluid is incomplete in gel breaking, the content of water insoluble substances is high, more residues are generated after gel breaking, and the formation is damaged, while the thickening agent used by the viscoelastic acid-based fracturing fluid is a surfactant and has a small molecular weight, and the formed viscoelastic acid-based fracturing fluid automatically breaks gel when contacting crude oil, formation water or natural gas.
3. The viscoelastic acid-based fracturing fluid has the advantages of simple raw materials, low cost, convenience in fluid preparation and the like.
Drawings
Figure 1 is a graph of the viscosity of an acid based fracturing fluid of dioctadecyldimethylammonium chloride as a function of temperature.
Figure 2 is a graph of acid-based fracturing fluid viscosity versus temperature for lauramidopropyl betaine.
FIG. 3 is a graph of acid based fracturing fluid viscosity of behenyl trimethyl ammonium chloride as a function of temperature.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
Example 1:
the embodiment provides an acid-based fracturing fluid, which comprises the following components in percentage by mass:
a thickening agent: dioctadecyldimethylammonium chloride 7.5wt. -%)
31wt.% concentrated hydrochloric acid: 50.0wt. -%)
A counter ion salt: 0.5wt.% of sodium dodecyl sulfate
Corrosion inhibitor: 0.5wt.% of bicyclic imidazoline
Iron ion stabilizer: 1.5wt.% of ethylenediaminetetraacetic acid sodium salt iron ion stabilizer
The balance being water.
The preparation process comprises the following steps:
according to the proportion, dioctadecyl dimethyl ammonium chloride is added into water at normal temperature to be fully dissolved, corrosion inhibitor dicyclo imidazoline 3, ethylene diamine tetraacetic acid disodium salt iron ion stabilizer and 31wt.% concentrated hydrochloric acid are sequentially added to obtain an acidic thickening agent solution, and counter ion salt lauryl sodium sulfate is dissolved into water, then the two solutions are mixed and stirred uniformly, so that a viscoelastic acid base fracturing fluid system can be obtained, and the data is shown in table 1.
TABLE 1 viscosity of dioctadecyl dimethyl ammonium chloride acid base fracturing fluid as a function of temperature
| Temperature/. |
60 | 70 | 80 | 90 | 100 | 110 | 120 |
| viscosity/ |
120 | 115 | 110 | 100 | 60 | 30 | 20 |
After the viscoelastic acid-based fracturing fluid completes the acidizing and fracturing effects in the stratum, the viscoelastic acid-based fracturing fluid is contacted with crude oil, formation water or natural gas to break gelled water, otherwise, viscoelastic substances can have negative effects on the acidizing and stimulation effects of the stratum. The viscoelastic acid-based fracturing fluid has the great characteristics that the gel is broken simply and thoroughly by the residual acid without adding a gel breaker, and the gel can be broken by the residual acid when the residual acid meets hydrocarbon.
Gel breaking experiments 1,
In the experiment, kerosene is selected as a gel breaker, acid-based fracturing fluid and the kerosene are mixed according to different proportions during the experiment, the mixture is stirred for 60min at 60 ℃ and 90 ℃, and then residual acid fracturing fluid is taken out to measure the viscosity (the apparent viscosity at the experiment temperature is less than 5mPa & s, namely the complete gel breaking). The data are shown in Table 2.
Gel breaking experiment 2,
In the experiment, a large amount of water is added, and the viscosity of the gel is measured (the apparent viscosity is less than 5mPa & s at the experiment temperature, namely the gel is broken completely). The data are shown in Table 3.
TABLE 2 viscosity of viscoelastic acid-based fracturing fluids at different temperatures after 60min with addition of different amounts of kerosene
| Coal oil content/wt. -%) | 5 | 6 | 8 | 10 | 12 |
| viscosity/mPas at 60 DEG C | 4 | 3 | 2 | 1 | 1 |
| viscosity/mPas at 90 DEG C | 1 | 1 | 0 | 0 | 0 |
TABLE 3 viscosity of viscoelastic acid-based fracturing fluids at different temperatures with different water additions
| Water/wt. -%) | 100 | 200 | 300 | 400 | 500 |
| viscosity/mPas at 60 DEG C | 45 | 24 | 5 | 1 | 0 |
| viscosity/mPas at 90 DEG C | 22 | 12 | 3 | 0 | 0 |
As can be seen from Table 1 and FIG. 1, the acid-based fracturing fluid prepared from the thickening agent dioctadecyl dimethyl ammonium chloride has viscosity decreasing with temperature rising, and the viscosity reaches 100mPa & s at 90 ℃, so that the viscosity required by fracturing sand carrying can be met.
As can be seen from Table 2, at a low temperature of 60 ℃, the kerosene content of 5wt.% can meet the gel breaking requirement, and the dioctadecyl dimethyl ammonium chloride acid-based fracturing fluid can completely break gel within 60-90 ℃.
As can be seen from Table 3, the dioctadecyldimethylammonium chloride acid based fracturing fluid broke completely when 3 times as much water was added.
Example 2:
the embodiment provides an acid-based fracturing fluid, which comprises the following components in percentage by mass:
a thickening agent: lauramidopropyl betaine 7.5wt. -%)
37wt.% concentrated hydrochloric acid: 50wt. -%)
A counter ion salt: 2.5wt.% of potassium chloride
Corrosion inhibitor: oleic acid imidazoline 2.5wt. -%)
Iron ion stabilizer: isoascorbic acid iron ion stabilizer 4.5wt. -%)
The balance being water.
The preparation process comprises the following steps:
according to the proportion, lauramidopropyl betaine is added into water at normal temperature and fully dissolved, corrosion inhibitor oleic acid imidazoline, isoascorbic acid iron ion stabilizer and 37wt.% concentrated hydrochloric acid are sequentially added to obtain an acidic thickening agent solution, a counter ion salt potassium chloride is dissolved in water, the two solutions are mixed and stirred uniformly, and a viscoelastic acid group fracturing fluid system can be obtained, wherein the data are shown in table 4.
TABLE 4 viscosity of lauramidopropyl betaine acid based fracturing fluid as a function of temperature
| Temperature- |
60 | 70 | 80 | 90 | 100 | 110 | 120 |
| viscosity/ |
150 | 140 | 130 | 120 | 100 | 60 | 20 |
After the viscoelastic acid-based fracturing fluid completes the acidizing fracturing effect in the stratum, gelled water needs to be broken when the viscoelastic acid-based fracturing fluid contacts crude oil, formation water or natural gas, otherwise, viscoelastic substances can have negative effects on the acidizing and stimulation effects of the stratum. The viscoelastic acid-based fracturing fluid has the great characteristics that the gel is broken simply and thoroughly by the residual acid without adding a gel breaker, and the gel can be broken by the residual acid when the residual acid meets hydrocarbon.
Gel breaking experiment 3,
In the experiment, kerosene is selected as a gel breaker, acid-based fracturing fluid and the kerosene are mixed according to different proportions during the experiment, the mixture is stirred for 60min at 60 ℃ and 100 ℃, and then residual acid fracturing fluid is taken out to measure the viscosity (the apparent viscosity at the experiment temperature is less than 5mPa & s, namely the complete gel breaking). The data are shown in Table 5.
Gel breaking experiment 4,
In the experiment, a large amount of water is added, and the viscosity of the gel is measured (the apparent viscosity is less than 5mPa & s at the experiment temperature, namely the gel is broken completely). The data are shown in Table 6.
TABLE 5 viscosity of viscoelastic acid-based fracturing fluids at different temperatures after 60min with addition of different amounts of kerosene
| Coal oil content/wt. -%) | 5 | 6 | 8 | 10 | 12 |
| viscosity/mPas at 60 DEG C | 4 | 3 | 2 | 1 | 1 |
| viscosity/mPas at 100 DEG C | 1 | 0 | 0 | 0 | 0 |
TABLE 6 viscosity of viscoelastic acid-based fracturing fluids at different temperatures after addition of different amounts of water
| Water/wt. -%) | 100 | 200 | 300 | 400 | 500 |
| viscosity/mPas at 60 |
50 | 25 | 5 | 1 | 0 |
| viscosity/mPas at 100 DEG C | 25 | 10 | 0 | 0 | 0 |
As can be seen from Table 4 and FIG. 2, the acid-based fracturing fluid prepared from the thickening agent lauramidopropyl betaine has viscosity decreasing with temperature rising, and the viscosity reaches 100mPa & s at 100 ℃, so that the viscosity required by fracturing sand carrying can be met.
As can be seen from table 5, at a low temperature of 60 ℃, 5wt.% of kerosene can meet the gel breaking requirement, and the lauramidopropyl betaine acid-based fracturing fluid can completely break gel within 60 ℃ to 100 ℃.
As can be seen from Table 6, the lauramidopropyl betaine acid-based fracturing fluid broke thoroughly when 3 times as much water was added.
Example 3:
the embodiment provides an acid-based fracturing fluid, which comprises the following components in percentage by mass:
a thickening agent: docosyltrimethylammonium chloride 4wt. -%)
31wt.% concentrated hydrochloric acid: 75.0wt. -%)
A counter ion salt: sodium benzoate 2.5wt. -%)
Corrosion inhibitor: 2.5wt.% of bromo-1, 4 (a-octylpyridine) butane
Iron ion stabilizer: iron citrate ion stabilizer 5.0wt. -%)
The balance being water.
The preparation process comprises the following steps:
according to the proportion, behenyl trimethyl ammonium chloride is added into water at normal temperature to be fully dissolved, corrosion inhibitors of bromo-1, 4 (a-octyl pyridine) butane, ferric citrate ion stabilizer and 31wt.% of concentrated hydrochloric acid are sequentially added to obtain an acidic thickening agent solution, counter ion salt sodium benzoate is dissolved into water, the two solutions are mixed and stirred uniformly, and a viscoelastic acid group fracturing fluid system can be obtained, wherein the data are shown in table 7.
TABLE 7 viscosity of behenyl trimethyl ammonium chloride acid based fracturing fluids as a function of temperature
| Temperature/. |
60 | 70 | 80 | 90 | 100 | 110 | 120 |
| viscosity/ |
180 | 165 | 150 | 138 | 124 | 100 | 60 |
After the viscoelastic acid-based fracturing fluid completes the acidizing fracturing effect in the stratum, gelled water needs to be broken when the viscoelastic acid-based fracturing fluid contacts crude oil, formation water or natural gas, otherwise, viscoelastic substances can have negative effects on the acidizing and stimulation effects of the stratum. The viscoelastic acid-based fracturing fluid has the great characteristics that the gel is broken simply and thoroughly by the residual acid without adding a gel breaker, and the gel can be broken by the residual acid when the residual acid meets hydrocarbon.
Gel breaking experiment 5,
In the experiment, kerosene is selected as a gel breaker, so that in the experiment, the kerosene is selected as a gel breaker, acid-based fracturing fluid and the kerosene are mixed according to different proportions in the experiment, the mixture is stirred for 60min at 60 ℃ and 110 ℃, and then residual acid fracturing fluid is taken out to measure the viscosity (the observed viscosity at the experiment temperature is less than 5mPa & s, namely complete gel breaking). The data are shown in Table 8.
Gel breaking experiment 6,
In the experiment, a large amount of water is added, and the viscosity of the gel is measured (the apparent viscosity is less than 5mPa & s at the experiment temperature, namely the gel is broken completely). The data are shown in Table 9.
TABLE 8 viscoelasticity of the acid-based fracturing fluids after 60min at different temperatures with different amounts of kerosene added
| Coal oil content/wt. -%) | 5 | 6 | 8 | 10 | 12 |
| viscosity/mPas at 60 DEG C | 4 | 3 | 2 | 1 | 1 |
| viscosity/mPas at 110 |
0 | 0 | 0 | 0 | 0 |
TABLE 9 viscosity of viscoelastic acid-based fracturing fluids at different temperatures after addition of different amounts of water
| Water/wt. -%) | 100 | 200 | 300 | 400 | 500 |
| viscosity/mPas at 60 |
60 | 40 | 5 | 1 | 0 |
| viscosity/mPas at 110 ℃ | 25 | 9 | 0 | 0 | 0 |
As can be seen from Table 7 and FIG. 3, the acid-based fracturing fluid prepared from the thickening agent behenyl trimethyl ammonium chloride has viscosity decreasing with temperature rising, and the viscosity reaches 100mPa & s at 110 ℃, so that the viscosity required by fracturing sand carrying can be met.
As can be seen from Table 8, at a low temperature of 60 ℃, the kerosene content of 5wt.% can meet the gel breaking requirement, and the behenyl trimethyl ammonium chloride acid base fracturing fluid can completely break gel within 60-110 ℃.
As can be seen from Table 9, the behenyl trimethyl ammonium chloride acid based fracturing fluid broke completely when 3 times more water was added.
Example 4:
in this example, the preparation method of comparative example 1 is to prepare an acid-based fracturing fluid, and the acid-based fracturing fluid comprises the following components in percentage by mass:
a thickening agent: dioctadecyldimethylammonium chloride 7.5wt. -%)
31wt.% concentrated hydrochloric acid: 50.0wt. -%)
A counter ion salt: 0.5wt.% of sodium dodecyl sulfate
Corrosion inhibitor: 0.5wt.% of bicyclic imidazoline
Iron ion stabilizer: 1.5wt.% of ethylenediaminetetraacetic acid sodium salt iron ion stabilizer
The balance being water.
The preparation process comprises the following steps:
according to the proportion, 31wt.% of concentrated hydrochloric acid is added into water at normal temperature, then corrosion inhibitor dicyclo imidazoline, ethylene diamine tetraacetic acid disodium salt iron ion stabilizer and dioctadecyl dimethyl ammonium chloride are sequentially added, the solution is fully dissolved to obtain an acidic thickening agent solution, a counter ion salt sodium dodecyl sulfate is dissolved into water, then the two solutions are mixed and stirred uniformly, and a viscoelastic acid base fracturing fluid system can be obtained, wherein the data are shown in table 10.
TABLE 10 viscosity as a function of temperature for different preparations of dioctadecyl dimethyl ammonium chloride acid based fracturing fluids
| Temperature/. |
60 | 70 | 80 | 90 | 100 | 110 | 120 |
| viscosity/mPas | 10 | 5 | 2 | 2 | 1 | 1 | 0 |
As can be seen from the data in tables 1 and 10, the thickening agent dioctadecyldimethylammonium chloride does not produce a viscoelastic acid-based fracturing fluid after being dissolved in acid, but does produce a viscoelastic acid-based fracturing fluid after being dissolved in water, so the thickening agent needs to be sufficiently dissolved in water.
Claims (7)
1. A viscoelastic acid-based fracturing fluid is prepared from a viscoelastic acid-based fracturing fluid composition;
the viscoelastic acid-based fracturing fluid composition comprises: a thickening agent: 2.0-7.5 parts by weight; 31-37 wt.% concentrated hydrochloric acid: 50.0 to 75.0 parts by weight; a counter ion salt: 0.5-2.5 parts by weight; corrosion inhibitor: 0.5-2.5 parts by weight; iron ion stabilizer: 1.5-5.0 weight portions; the viscoelastic acid-based fracturing fluid composition further comprises an appropriate amount of water, such that the sum of the components is 100 parts by weight; wherein the thickening agent comprises one or more of hexadecyl trimethyl ammonium chloride, docosyl trimethyl ammonium chloride, dihexadecyl dimethyl ammonium chloride, dioctadecyl dimethyl ammonium chloride and lauramidopropyl betaine;
the preparation method comprises the following steps:
a. dissolving a thickening agent in water, adding a corrosion inhibitor and an iron ion stabilizer, and then adding concentrated hydrochloric acid to obtain an acidic thickening agent liquid;
b. dissolving a counter ion salt in water to obtain a counter ion solution;
c. and mixing the acidic thickening agent liquid with the counter ion solution, and uniformly stirring to obtain the viscoelastic acid-based fracturing fluid system.
2. The viscoelastic acid-based fracturing fluid of claim 1, having the composition, based on 100% of its total weight:
a thickening agent: 2.0wt.% to 7.5 wt.%;
31-37 wt.% concentrated hydrochloric acid: 50.0wt.% to 75.0 wt.%;
a counter ion salt: 0.5wt.% to 2.5 wt.%;
corrosion inhibitor: 0.5wt.% to 2.5 wt.%;
iron ion stabilizer: 1.5wt.% to 5.0 wt.%;
water: and (4) the balance.
3. The viscoelastic acid based fracturing fluid of claim 1, wherein the counterion salt comprises one or more of sodium lauryl sulfate, sodium salicylate, sodium benzoate, potassium chloride.
4. The viscoelastic acid-based fracturing fluid of claim 1, wherein the corrosion inhibitor comprises one or more of chlorinated-1, 6- (α -octylpyridine) hexane, 1, 3-dichloropyridine-2 hydroxypropane, brominated-1, 4(α -octylpyridine) butane, oleamidoimidazoline, bicycloalkylimidazoline, benzimidazole.
5. The viscoelastic acid-based fracturing fluid of claim 1, wherein the iron ion stabilizer comprises one or more of a ferric citrate ion stabilizer, a sodium ethylenediaminetetraacetate iron ion stabilizer, and a ferric erythorbate ion stabilizer.
6. The viscoelastic acid-based fracturing fluid of claim 1, wherein,
the thickening agent comprises behenyl trimethyl ammonium chloride and dioctadecyl dimethyl ammonium chloride;
the counter ion salt comprises sodium dodecyl sulfate and sodium benzoate;
the corrosion inhibitor comprises brominated-1, 4 (alpha-octyl pyridine) butane and bicyclic imidazoline;
the iron ion stabilizer comprises a ferric citrate ion stabilizer and an ethylenediaminetetraacetic acid sodium salt iron ion stabilizer.
7. A method of preparing a viscoelastic acid based fracturing fluid according to any one of claims 1 to 6, comprising the steps of:
a. dissolving a thickening agent in water, adding a corrosion inhibitor and an iron ion stabilizer, and then adding concentrated hydrochloric acid to obtain an acidic thickening agent liquid;
b. dissolving a counter ion salt in water to obtain a counter ion solution;
c. and mixing the acidic thickening agent liquid with the counter ion solution, and uniformly stirring to obtain the viscoelastic acid-based fracturing fluid system.
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| CN109456751B (en) * | 2018-12-20 | 2022-01-25 | 西南石油大学 | Low-damage thickening acid and preparation method and application thereof |
| CN110373173A (en) * | 2019-07-23 | 2019-10-25 | 孙国平 | A kind of repeatable crosslinking clean fracturing fluid thickener of high temperature resistant |
| CN110846017A (en) * | 2019-11-13 | 2020-02-28 | 深圳市百勤石油技术有限公司 | Acidic clean fracturing fluid for acidizing fracturing production increasing measures of oil and gas reservoir |
| CN111253929B (en) * | 2020-02-13 | 2022-05-10 | 成都英士瑞科技有限公司 | Diverting agent for high-temperature acid |
| CN115584250B (en) * | 2022-11-29 | 2024-01-16 | 四川大学 | High-temperature-resistant strong-acidity viscoelastic fluid, and preparation and application thereof |
| CN115895609B (en) * | 2022-11-29 | 2024-01-12 | 四川大学 | Strong temperature-resistant and salt-resistant worm-like micelle system based on supramolecular self-assembly and its preparation method and application |
| CN115678517A (en) * | 2022-11-29 | 2023-02-03 | 四川大学 | High temperature resistant viscoelastic fluid based on ultra-long chain surfactant and its preparation method and application |
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