CN103756664B - Densifier and fracturing fluid for shale gas fracturing fluid, preparation method and application thereof - Google Patents
Densifier and fracturing fluid for shale gas fracturing fluid, preparation method and application thereof Download PDFInfo
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- CN103756664B CN103756664B CN201410026220.1A CN201410026220A CN103756664B CN 103756664 B CN103756664 B CN 103756664B CN 201410026220 A CN201410026220 A CN 201410026220A CN 103756664 B CN103756664 B CN 103756664B
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- fracturing fluid
- fracturing
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- 239000012530 fluid Substances 0.000 title claims abstract description 142
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000004576 sand Substances 0.000 claims abstract description 40
- 239000004094 surface-active agent Substances 0.000 claims abstract description 24
- 239000000654 additive Substances 0.000 claims abstract description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 14
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 10
- 239000002562 thickening agent Substances 0.000 claims description 56
- 239000003795 chemical substances by application Substances 0.000 claims description 47
- 239000000203 mixture Substances 0.000 claims description 20
- 230000015572 biosynthetic process Effects 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- 229960000686 benzalkonium chloride Drugs 0.000 claims description 8
- CADWTSSKOVRVJC-UHFFFAOYSA-N benzyl(dimethyl)azanium;chloride Chemical group [Cl-].C[NH+](C)CC1=CC=CC=C1 CADWTSSKOVRVJC-UHFFFAOYSA-N 0.000 claims description 8
- 239000003513 alkali Substances 0.000 claims description 7
- 229960002233 benzalkonium bromide Drugs 0.000 claims description 7
- KHSLHYAUZSPBIU-UHFFFAOYSA-M benzododecinium bromide Chemical compound [Br-].CCCCCCCCCCCC[N+](C)(C)CC1=CC=CC=C1 KHSLHYAUZSPBIU-UHFFFAOYSA-M 0.000 claims description 7
- -1 heptanedioyl Chemical group 0.000 claims description 7
- 150000001298 alcohols Chemical class 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 5
- NFUDTVOYLQNLPF-UHFFFAOYSA-M trimethyl-[3-(2-methylprop-2-enoyloxy)propyl]azanium;chloride Chemical compound [Cl-].CC(=C)C(=O)OCCC[N+](C)(C)C NFUDTVOYLQNLPF-UHFFFAOYSA-M 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 4
- 238000003786 synthesis reaction Methods 0.000 claims description 4
- 230000003213 activating effect Effects 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- UZIQYAYUUNMDMU-UHFFFAOYSA-N N.[Br+] Chemical compound N.[Br+] UZIQYAYUUNMDMU-UHFFFAOYSA-N 0.000 claims 1
- 230000008719 thickening Effects 0.000 abstract description 8
- 150000003839 salts Chemical class 0.000 abstract description 2
- 239000003381 stabilizer Substances 0.000 abstract description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract 3
- DMLOUIGSRNIVFO-UHFFFAOYSA-N 3-(prop-2-enoylamino)butane-2-sulfonic acid Chemical compound OS(=O)(=O)C(C)C(C)NC(=O)C=C DMLOUIGSRNIVFO-UHFFFAOYSA-N 0.000 abstract 1
- QNILTEGFHQSKFF-UHFFFAOYSA-N n-propan-2-ylprop-2-enamide Chemical compound CC(C)NC(=O)C=C QNILTEGFHQSKFF-UHFFFAOYSA-N 0.000 abstract 1
- 238000010008 shearing Methods 0.000 abstract 1
- 235000011121 sodium hydroxide Nutrition 0.000 abstract 1
- NEQZXUBZTZDVAF-UHFFFAOYSA-M trimethyl(2-methylprop-2-enoyloxy)azanium;chloride Chemical compound [Cl-].CC(=C)C(=O)O[N+](C)(C)C NEQZXUBZTZDVAF-UHFFFAOYSA-M 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 65
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 44
- 238000012360 testing method Methods 0.000 description 26
- 239000003292 glue Substances 0.000 description 24
- 239000007789 gas Substances 0.000 description 16
- 238000010276 construction Methods 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 230000006378 damage Effects 0.000 description 14
- 239000002585 base Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 230000035699 permeability Effects 0.000 description 11
- 230000000996 additive effect Effects 0.000 description 9
- 239000011435 rock Substances 0.000 description 9
- 239000006004 Quartz sand Substances 0.000 description 8
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 8
- 239000000499 gel Substances 0.000 description 8
- 239000000047 product Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000003068 static effect Effects 0.000 description 7
- 208000027418 Wounds and injury Diseases 0.000 description 6
- 238000004220 aggregation Methods 0.000 description 6
- 230000002776 aggregation Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 6
- 208000014674 injury Diseases 0.000 description 6
- 238000000974 shear rheometry Methods 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- ZHCGVAXFRLLEFW-UHFFFAOYSA-N 2-methyl-3-(prop-2-enoylamino)propane-1-sulfonic acid Chemical compound OS(=O)(=O)CC(C)CNC(=O)C=C ZHCGVAXFRLLEFW-UHFFFAOYSA-N 0.000 description 4
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 4
- 238000005553 drilling Methods 0.000 description 4
- 239000006260 foam Substances 0.000 description 4
- 230000000887 hydrating effect Effects 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 230000008961 swelling Effects 0.000 description 4
- 229920002907 Guar gum Polymers 0.000 description 3
- 239000004927 clay Substances 0.000 description 3
- 239000003431 cross linking reagent Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000706 filtrate Substances 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
- 230000001965 increasing effect Effects 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000000975 bioactive effect Effects 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 230000001351 cycling effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000004945 emulsification Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000000306 recurrent effect Effects 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- MPNXSZJPSVBLHP-UHFFFAOYSA-N 2-chloro-n-phenylpyridine-3-carboxamide Chemical compound ClC1=NC=CC=C1C(=O)NC1=CC=CC=C1 MPNXSZJPSVBLHP-UHFFFAOYSA-N 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 244000241257 Cucumis melo Species 0.000 description 1
- 235000015510 Cucumis melo subsp melo Nutrition 0.000 description 1
- 108010010803 Gelatin Proteins 0.000 description 1
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- FJJCIZWZNKZHII-UHFFFAOYSA-N [4,6-bis(cyanoamino)-1,3,5-triazin-2-yl]cyanamide Chemical compound N#CNC1=NC(NC#N)=NC(NC#N)=N1 FJJCIZWZNKZHII-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 125000002252 acyl group Chemical group 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229920006037 cross link polymer Polymers 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 229920013818 hydroxypropyl guar gum Polymers 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 150000003384 small molecules Chemical group 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000010189 synthetic method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- VVEPKWSPMLXNKZ-UHFFFAOYSA-M trimethyl(prop-2-enoyloxy)azanium;chloride Chemical compound [Cl-].C[N+](C)(C)OC(=O)C=C VVEPKWSPMLXNKZ-UHFFFAOYSA-M 0.000 description 1
Classifications
-
- 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F265/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00
- C08F265/10—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00 on to polymers of amides or imides
-
- 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
-
- 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
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
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- C—CHEMISTRY; METALLURGY
- 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
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/882—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Polymers & Plastics (AREA)
- Medicinal Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Detergent Compositions (AREA)
Abstract
The invention provides densifier and fracturing fluid for shale gas fracturing fluid, a preparation method and application thereof. The densifier is synthesized by viscoelastic surfactant, polyacrylamide, 2-propeneamido-methylpropanesulfonic acid, methacryloxy trimethyl ammonium chloride, N-isopropylacrylamide, pimeloyl and caustic soda flakes in a ratio of 3:(5-7):(0.4-0.6):(1-2):(1.5-2.5):(1.5-2.5):(0.8-1.2). The fracturing fluid comprises the densifier, a rheological aid mixed by surfactant and ethanol in a ratio of 1:(1.5-2.5), and a temperature stabilizing agent. The invention also provides application of the fracturing fluid in shale gas continuous sand fracturing and a shale gas continuous sand fracturing method. The fracturing fluid is clean fracturing fluid, has the characteristics of low hurt, effective thickening, temperature resistance, salt resistance, shearing resistance, low friction and the like, and is good in compatibility with other common water-borne fracturing fluid additives.
Description
Technical field
The present invention is with regard to a kind of shale gas fracturing fluid thickening agent, fracturing fluid and preparation method and application, concrete and
Speech, the present invention relates to a kind of active thickening agent being particularly suitable for the continuous sand fracturing of shale gas, the preparation method of this thickening agent,
The fracturing fluid composition comprising this thickening agent, the fracturing fluid comprising this thickening agent, fracturing fluid are in the continuous sand fracturing of shale gas
In application and shale gas continuous sand fracturing method.
Background technology
China's oil gas field less permeable layer rich reserves, but its natural production capacity is low or basic no natural production capacity.Application fracturing fluid
Technology this kind of oil-gas reservoir of exploitation is significant, and the major function of fracturing fluid is to take the palm agent (quartz sand, a haydite containing memory fluid
Deng) enter and press off stratum, increase permeability so that frscturing.
Shale gas show ultralow permeability, and reservoir fragility also differs.For fragility shale, need to take slippery water
And linear glue laminated splits system and improves yield by network pressure break；For the not high shale of brittleness index, then need by continuous
The mode of sand fracturing forms sufficiently long single crack to improve yield.Because slippery water and linear glue prop-carrying capacity have relatively
Limit, it is considered to the reality of shale reservoir intrinsic fracture growth, makes every effort to strut intrinsic fracture angle from construction, and fracturing fluid viscosity will
Control in 20-100cp, intrinsic fracture is more vulnerable to outside fluid injury simultaneously, fracturing fluid must possess low injury rate.
Traditional conventional fracturing fluid is aqueous fracturing fluid, and it is mainly with macromolecule guar gum glycan class or its modified product etc.
For thickening agent (thickener), with multivalent metal salt as crosslinking agent, through being sufficiently stirred for forming frozen glue.Complete to make seam in fracturing fluid and take
After sand, the permanent sand packed fracture of formation, make fracturing fluid break glue viscosity reduction rapidly using gel breaker, become the broken glue of approximate clear water
Change liquid to discharge from stratum.And insoluble matter level of residue is higher after traditional fracturing liquid rubber-breaking, these residues can block rock stratum hole, because
Fracturing fluid is incompatible and causes clay swell or emulsification etc. with the rock on stratum and fluid, all can cause to in-place permeability
Injury, have a strong impact on fracturing yield increasing effect, therefore it is required that the insolubles content in fracturing fluid is more low better, fracturing fluid and stratum
Middle material should not occur harmful physics and chemical change, be easy to discharge from stratum, reduce fracturing fluid over the ground as far as possible after pressure break
The pollution of layer.So the clean fracturing fluid of the low residue of Low Damage is developing direction.
Clean fracturing liquid system with regard to viscoelastic surfactant base is reported in a large number in recent years.This kind of fracturing liquid
It is the result that its viscosity is molecular association is assembled, after meeting oil, coherent condition changes, englobement low-viscosity (mobile) liquid, automatically breaks glue,
And because it is small molecule no residue, little to formation damage.But in prior art this kind of viscoelastic surfactant fracturing fluid with
The reduction of viscosity, its prop-carrying capacity has declined, be that corresponding cost is relatively using higher concentration in large-scale application
High.
Additionally, the speed that current China major part fractured well can realize fracturing fluid base fluid is joined, but due to continuous mixture dress
Put also seldom it is impossible to realize the continuous mixture of fracturing fluid prepared in construction, variable concentrations can only be prepared with quick liquid-confecting car
Base fluid, is divided in different flow containers, uses from high to low by concentration in construction.Therefore, improve the instant of fracturing fluid gelatinizer
Performance is also one of key technology of fracturing fluid research and development.
To sum up, in the urgent need to researching and developing new fracturing fluid system.
Content of the invention
It is an object of the present invention to provide a kind of shale gas fracturing fluid thickening agent, it has good instant capacity,
Can be used for preparing clean fracturing fluid, possess Low Damage, high-effective viscosity characteristic, temperature resistance, salt-resistance, shear resistant, low frictional resistance etc.
Characteristic, and with other conventional Water-base Fracturing Fluid Additives, there is preferable compatibility.
Another object of the present invention is to providing the preparation method of described thickening agent.
Another object of the present invention is to providing a kind of fracturing fluid composition comprising described thickening agent.
Another object of the present invention is to providing a kind of fracturing fluid comprising described thickening agent.
Another object of the present invention is to providing application in the continuous sand fracturing of shale gas for the described fracturing fluid.
Another object of the present invention is to providing a kind of shale gas continuous sand fracturing method.
For reaching above-mentioned purpose, on the one hand, the invention provides a kind of fracturing fluid thickening agent, this thickening agent is mainly by gluing
Elastic surface activating agent, polyacrylamide, 2- acrylamido-methyl propane sulfonic acid, methacryloxypropyl trimethyl ammonium chloride, n-
N-isopropylacrylamide, heptanedioyl, piece alkali etc. press 3:5～7:0.4～0.6:1～2:1.5～2.5:1.5～2.5:0.8～1.2
Volume ratio synthesis.
According to the most preferred embodiment of the present invention, described thickening agent is mainly by viscoelastic surfactant, polypropylene
Acid amides, 2- acrylamido-methyl propane sulfonic acid, methacryloxypropyl trimethyl ammonium chloride, n- N-isopropylacrylamide, heptan two
Acyl, piece alkali synthesize according to the volume ratio of 3:6:0.5:1.5:2:2:1.
According to specific embodiments of the present invention, wherein, described viscoelastic surfactant is benzalkonium chloride (geramine)
And/or benzalkonium bromide (bromogeramine).
On the other hand, present invention also offers the preparation method of described thickening agent, the method includes: viscoelastic surface is lived
Property agent is mixed and heated with polyacrylamide resin and so that it is melted completely, is subsequently adding 2- acrylamido-methyl propane sulfonic acid, first
Base acryloyl-oxy trimethyl ammonium chloride, n- N-isopropylacrylamide, heptanedioyl, piece alkali, stir at a temperature of 120 DEG C～160 DEG C
Mix more than 1 hour, usually 1～2 hour, products therefrom was described thickening agent.
According to the preparation method of the present invention, it is solid that products therefrom is cooled to after normal temperature, can suitably pulverize, and obtains a kind of crystalline substance
The thickening agent product of body powder.This thickening agent product can be used for liquid thickening.
On the other hand, present invention also offers a kind of fracturing fluid compositions of additives, said composition includes institute of the present invention
The thickening agent stated.The thickening agent of the present invention can be used for preparing fracturing fluid as a kind of activity thickening agent.This thickening agent has good
Good instant capacity, and fracturing fluid can be made under relatively low concentration to have suitable viscosity.Preferably, described thickening agent is in pressure break
Addition in liquid is 0.2%～0.8%.
According to specific embodiments of the present invention, in the fracturing fluid compositions of additives of the present invention, except described thickening
Outside agent, also include auxiliary rheological agents.According to specific embodiments of the present invention, described auxiliary rheological agents are by surfactant and ethanol
Preferably form according to the volume ratio physical mixed of 1:2 by the volume ratio of 1:1.5～2.5.Preferably, described surfactant
For benzalkonium chloride (geramine) and benzalkonium bromide (bromogeramine).Such auxiliary rheological agents can be used for described thickening agent bioactive molecule
Between associate formed aggregation, formed space net structure, improve fracturing fluid hydroelasticity, simultaneously effectively change liquid in tubing string
Fluidised form and construction friction is greatly lowered.Preferably, addition in fracturing fluid for the described auxiliary rheological agents is 0.2%～0.8%.
According to specific embodiments of the present invention, in the fracturing fluid compositions of additives of the present invention, except described thickening
Outside agent, auxiliary rheological agents, also can further include temperature stability agent.Compositions of additives including temperature stability agent is applied to preparation
Fracturing fluid for formation temperature higher (for example, more than 120 DEG C).Preferably, described temperature stability agent is by surface-active
Agent and straight chain alcohols material press the volume ratio of 1～2:2 preferably according to the volume ratio synthesis of 1.5:2.Surfactant is benzene
Prick oronain (geramine) or benzalkonium bromide, alcohols is preferably ethanol.Such temperature stability agent can be used for stablizing fracturing fluid of the present invention
The not chain rupture under the conditions of high temperature superhigh temperature formation temperature and long-time continuous shear stress of space net structure aggregation.More specifically
Ground, described temperature stability agent can be formed by directly mixing by surfactant and straight chain alcohols material it is also possible to add suitable quantity of water
Mix for auxiliary material.Preferably, addition in fracturing fluid for the described temperature stability agent is 0.2%～0.8%, preferably 0.4%
～0.6%.
On the other hand, the invention provides a kind of fracturing fluid, on the basis of the gross weight of this fracturing fluid, its component includes:
Thickening agent 0.2%～0.8% of the present invention；
Auxiliary rheological agents 0.2%～0.8% of the present invention.
According to specific embodiments of the present invention, when the fracturing fluid of the present invention is used for temperature higher stratum, wherein also may be used
Further include described temperature stability agent.Preferably, addition in fracturing fluid for the described temperature stability agent is 0.2%～0.8%,
It is preferably 0.4%～0.6%.
In addition to described thickening agent, auxiliary rheological agents, temperature stability agent, also alternative in the fracturing fluid of the present invention add or not
Add other fracturing fluid conven-tional adjuvants.Additionally, the surplus group of fracturing fluid is divided into water, can be common fracturing fluid preparation water.
According to specific embodiments of the present invention, the fracturing fluid of the present invention can coordinate co2Carry out co2Mixing pressure break.
Each raw material in the thickening agent of the present invention and fracturing fluid is all commercially available, each raw material of different manufacturers different model
Performance may be different, as long as but each raw material meets corresponding Industry code requirements, that is, it is used equally to the present invention.Preferably employ this
The preferable raw material of quality is generally believed in field.Wherein said polyacrylamide can be that oil field fracturing fluid additive agent field is normal
Polyacrylamide, for example, can be polyacrylamide of model jhj15 that Jilin Chemical Jusheng produces etc..
On the other hand, present invention also offers application in the continuous sand fracturing of shale gas for the described fracturing fluid.Preferably
Ground, is to coordinate co using the fracturing fluid of the present invention2Carry out co2Mixing pressure break.In addition, the fracturing fluid of the present invention can also be used for routine
Pressure break.
On the other hand, present invention also offers a kind of shale gas continuous sand fracturing method, it is wherein using institute of the present invention
The fracturing fluid stated.
Preferably, it is to coordinate co using described fracturing fluid2Carry out co2Mixing pressure break.Specifically, the shale gas of the present invention
The routine operation that continuous sand fracturing method is referred in described field is carried out.
When being embodied as, when preparing the fracturing fluid of the present invention, liquid equipment of joining used specifically includes that mixing vehicle or joins liquid
Car, flow container, liquid distribution pipe line, jet pump etc..Join liquid step: using liquid distribution pipe line by mixing vehicle or liquid distributing vehicle, flow container, jet pump
Connect Deng equipment, sucked thickening agent in flow container (tank content assembles liquid water) using mixing vehicle or liquid distributing vehicle jet pump, with
When ensure flow container treat after recurrent state, suction always liquid swelling (about 5-15 minute, concrete swelling time with add thickening agent
Amount relevant) add auxiliary rheological agents and other additives afterwards.Join liquid after continuing cycling through 10-15 minute to complete, obtain active fracturing
Liquid.
Active fracturing liquid system provided by the present invention, mainly use in Fracture fluid solution pass through between molecule non-covalent
Key (electrostatic, hydrogen bond, hydrophobic association effect etc.) interacts, and forms intermolecular aggregated structure, this aggregated structure can
To become big with shear perturbation or to diminish or even break completely, after shear perturbation eliminates, aggregation recovers again, is formed at oneself
The so rare one kind in boundary " reversible construction solution ", thus the multiple association effect occurring stronger molecule interchain reversible forms oversubscription
Sub- aggregation, has the spacial framework similar to cross-linked polymer it is not necessary to crosslinking can have the complete of clean fracturing fluid
Portion's performance, simultaneously but also with characteristics such as cleaning Low Damage, high-effective viscosity characteristic, temperature resistance, salt-resistance, shear resistant, low frictional resistances,
There is good rheological characteristic and sand carrying effect, and with other conventional Water-base Fracturing Fluid Additives, there is preferable compatibility.
Brief description
Fig. 1 is 50 DEG C of shear rheology curves of fracturing fluid in the present invention one specific embodiment；
Fig. 2 is 100 DEG C of shear rheology curves of fracturing fluid in the present invention one specific embodiment；
Fig. 3 is 120 DEG C of shear rheology curves of fracturing fluid in the present invention one specific embodiment；
Fig. 4 is 130 DEG C of shear rheology curves of fracturing fluid in the present invention one specific embodiment；
Fig. 5 is 150 DEG C of shear rheology curves of fracturing fluid in the present invention one specific embodiment；
Fig. 6 is quartz sand and haydite sinking speed test curve in fracturing fluid in the present invention one specific embodiment；
Fig. 7 is dh-db activity co in the present invention one specific embodiment2Foam fracturing fluid construction curve；
Fig. 8 is live flow container sampling 150 DEG C of continuous shear stress viscosity temperature characteristic curves of detection in the present invention one specific embodiment；
Fig. 9 is the deep 17 well sand fracturing construction curve of Pu in the present invention one specific embodiment；
Figure 10 is sectional well completion tubing string schematic diagram in the present invention one specific embodiment；
Figure 11 is segmentation sand fracturing construction curve in the present invention one specific embodiment；On the left of picture, ordinate data is from upper
To under be followed successively by: total amount of liquid (m3), sand discharge capacity (m3/ min), oil pressure (mpa)；On the right side of picture ordinate data from top to bottom according to
Secondary it is: casing pressure (mpa), pump truck output (m3/ min)；
Figure 12 is production curve (Soviet Union's 53-82-48h gas production curve) after pressure in the present invention one specific embodiment.
Specific embodiment
Below by way of specific embodiment and be described with reference to the accompanying drawings technical scheme and can be generated by beneficial
Effect it is intended to help reader to more fully understand essence and the feature of the present invention, not as to this case can practical range restriction.
Embodiment 1
1st, the preparation of fracturing fluid key additive
1.1 thickening agent dh-db-1
Thickening agent in the present embodiment is by viscoelastic surfactant (benzalkonium chloride), polyacrylamide, amps, methyl-prop
Alkene acyl-oxygen trimethyl ammonium chloride, n- N-isopropylacrylamide, heptanedioyl, piece alkali etc. press the volume ratio of 3:6:0.5:1.5:2:2:1
Example synthesis, concrete synthetic method is as follows:
Viscoelastic surfactant is mixed with polyacrylamide resin and middle heating makes it melt completely, be subsequently adding 2-
Acrylamido-methyl propane sulfonic acid, methacryloxypropyl trimethyl ammonium chloride, n- N-isopropylacrylamide, heptanedioyl, piece alkali,
Stirring reaction about 2 hours at 150 DEG C, products therefrom is the thickening agent of the present embodiment, is solid product after being cooled to normal temperature, powder
Broken, obtain final product crystal powder, for liquid thickening.This thickening agent of the present invention is called active thickening agent dh-db-1.This dh-db-1 is thick
Agent thickening capabilities are strong, have instant performance, are highly susceptible to extemporaneous preparation, and in the case of not adopting the mixed tune of high speed, glue does not produce
Raw flake, dispersiveness and swellability are preferable.
1.2 auxiliary rheological agents dh-db-2
Auxiliary rheological agents in the present embodiment press the volume ratio normal temperature physics of 1:2 by surfactant benzalkonium chloride and ethanol
Mix, liquid, for dh-db-1 bioactive molecule between associate formed aggregation, formed space net structure, improve liquid shell
Property, effectively change fluidised form in tubing string for the liquid simultaneously and construction friction is greatly lowered.In the present invention, this auxiliary rheological agents is called
dh-db-2.
1.3 temperature stability agent dh-db-3
Temperature stability agent in the present embodiment presses 1.5:2 volume ratio by surfactant benzalkonium bromide and straight chain alcohols material
Example normal temperature mixes, for stablize the space net structure aggregation of dh-db fracturing fluid in high temperature superhigh temperature formation temperature and
Not chain rupture under the conditions of long-time continuous shear stress.In the present invention, this temperature stability agent is called dh-db-3.Only when formation temperature exceedes
This additive is just used when 120 DEG C.
1.4 fracturing fluid dh-db
Using described active thickening agent dh-db-1, auxiliary rheological agents dh-db-2, or add temperature stability agent dh- further
The fracturing fluid that db-3 prepares, the present invention is referred to as dh-db active fracturing liquid.
During concrete preparation, (tank content assembling liquid is used using mixing vehicle or liquid distributing vehicle jet pump, thickening agent to be sucked flow container
Water) in, simultaneously ensure flow container treat after recurrent state, suction always liquid swelling (about 5-15 minute, concrete swelling time with plus
The amount entering thickening agent is relevant) add auxiliary rheological agents and other additive afterwards.Join liquid after continuing cycling through 10-15 minute to complete, obtain
Active fracturing liquid dh-db.Device therefor is this field conventional equipment.
2nd, dh-db active fracturing fluidity energy
2.1 rheological property
1) base fluid and gelatin viscosity
The apparent viscosity of the dh-db active fracturing liquid-based liquid of different formulations and frozen glue is referring to table 1.
Table 1dh-db active fracturing liquid-based liquid and the apparent viscosity of frozen glue
2) shear at high temperature stability
Crosslinking agent type, shear rate, temperature, base fluid viscosity, oxygen content, ph value etc. are all impact fracturing fluid rheological characteristics
Factor.In rheological characteristic test, mainly investigate temperature resistance thickening and the anti-shear ability of dh-db active fracturing liquid.
Tested using mas- HTHP rheometer.
Install fracturing fluid and set flow graph heating-up temperature, change over trend with apparent viscosity and determine cutting of fracturing fluid
Cut stability.With 170s-1Lower continuous shear stress, until fracturing fluid apparent viscosity be 50mpa.s when till.
Shear rheology curve under different temperatures refers to shown in Fig. 1～Fig. 5, and in table one, the rheological curve of sequence number 1-5 divides
Other corresponding diagram 1- Fig. 5.Test result indicate that, several groups of fracturing fluid 170s-1Under, after continuous shear stress 120min, viscosity is all existing
More than 50mpa.s, meets or exceeds petroleum industry relevant criterion and requires.
The instant performance of 2.2dh-db-1 thickening agent
For checking the instant performance of dh-db-1 thickening agent, the present embodiment has carried out dissolubility test, the reality of measured amounts
Test and use water, by 0.6% and 0.8% mass concentration, thickening agent is slowly poured into, stirring while adding, place 4 hours, observe viscosity at any time
Between change, experimental result is shown in Table 2.
Table 2dh-db-1 thickening agent dissolution velocity is tested
Test result indicate that, under conditions of dh-db-1 thickening agent is stirred with glass bar, after 8 minutes, base fluid viscosity can reach
More than the 90% of final viscosity, and there is no flake；Under conditions of mixed tune device high-speed stirred, after 3 minutes, base fluid viscosity can reach
The 98% of whole viscosity, illustrates that this thickening agent dissolution velocity is fast, good dispersion, and thickening is fast, can meet the requirement of continuous mixture.
2.3 surface and interface tension force
Test the surface tension of base fluid using surface tension instrument ring method, method test base fluid is dripped using interfacial tensimeter rotation
Interfacial tension, thus making an appraisal to the row's of returning characteristic of fracturing fluid, the again preferred offer for surfactant, cleanup additive simultaneously
Reference.The dh-db active fracturing liquid surface and interface tension force of different formulations is referring to table 3.
Table 3dh-db active fracturing liquid surface and interface tension force
By test result as can be seen that the thickening agent as fracturing fluid host of the present invention belongs to low molecule activating agent, have
Good reduction table, interfacial tension act on, and low surface and interface tension force advantageously reduces water lock phenomenon, accelerates the row of returning of breaking glue solution.
From experiment, the row of helping of breaking glue solution leads all more than 17%, is above the index request of professional standard 15%.
2.4 outstanding sand abilities
The dh-db active fracturing liquid of the present invention is a kind of fluid with viscous-elastic behaviour, and proppant sedimentation is to investigate in reality
Test at temperature and static conditions, the rate of settling of proppant.The settling height of proppant and sedimentation time have linear relationship, its
Slope is the static rate of settling of this proppant.
Experimental technique:
100ml dh-db5 fracturing fluid sample (0.8%dh-db-1+0.5%dh-db-2+ is measured in 100ml graduated cylinder
0.6%dh-db-3)；
Fracturing fluid selection several proppants (the haydite, quartz sand) sample that sphericity is preferable, grain size is medium, after putting into
The down position in test each comfortable difference moment, and averaged；
Simulate the relational expression of settling height and time using linear relationship, slope is sinking speed.
Fig. 6 gives and adds haydite and quartz sand, haydite and quartz sand sinking speed test knot in dh-db active fracturing liquid
Really.Knowable to test result, in dh-db active fracturing liquid, the sinking speed of quartz sand is slightly less than haydite, linear fit table
Bright: the sinking speed of quartz sand is 0.005cm/s, haydite is 0.0058cm/s.
Because the dh-db active fracturing liquid of the present invention is a kind of system being totally different from conventional aqueous fracturing fluid, its property
Can method of testing nor carry out fully according to professional standard " aqueous fracturing fluid performance test methods ".Interior according to the present invention
Result of study, apparent viscosity should be combined by the test of solid-carrying performance with sinking speed.
The main test index of the solid-carrying performance of conventional fracturing fluid is apparent viscosity (with 170s-1Based on) it is generally recognized that viscous
Degree, in more than 50mpa.s, can meet solid-carrying performance and require.But inventor finds under study for action, with traditional melon
Fracturing fluid is compared, and under identical viscosity, the sinking speed of the dh-db active fracturing liquid of the present invention is substantially low, therefore exists
In the rheological characteristic test of active fracturing liquid, test proppant (or steel ball) sinking speed test need to be supplemented.
Understand (to hang sand data with the static state that static outstanding sand instrument records indoors as follows: single by outstanding sand ability contrast test
Quartz sand, static outstanding sand speed is less than 0.06cm/min, and when sand ratio is during for 35%, static outstanding sand speed is less than 0.40cm/min, by
This data can be seen that), dh-db active fracturing liquid has good outstanding sand ability, wherein No. 5 dh-db(0.8%dh-db-1+
0.5%dh-db-2+0.6%dh-db-3) fracturing fluid viscosity at room temperature is 165mpa.s, and 30% sand is than placement 24 in the quiescent state
Do not settle, and the viscosity of guar gum fracturing fluid (0.55% hydroxypropyl guar gum hpg+0.3% crosslinking agent htc-160) be 1600mpa.s,
The outstanding sand ability of the two is substantially suitable.
2.5 broken colloidality energy
The effect of gel breaker is to complete to make seam in fracturing fluid and take sand, after forming permanent sand packed fracture, makes fracturing fluid
Break rapidly glue viscosity reduction, the broken glue hydrating fluid becoming approximate clear water is discharged from stratum.Reduce the time of staying in stratum for the hydrating fluid
And level of residue, also just decrease the possibility of reservoir and sand packed fracture permeability impairment.
Substantial amounts of practice is it has been proved that the viscosity of fracturing liquid rubber-breaking hydrating fluid is lower, less to formation damage.Hydrating fluid glues
Degree height, raffinate during the increase row of returning is passed through the resistance in crack duct, reduces drain age velocity and lifting rate, when increasing delay
Between.
In the present embodiment, using ammonium persulfate as dh-db active fracturing liquid gel breaker, by the requirement of professional standard,
In 80-100 DEG C of water-bath, glue performance test is carried out brokenly to the ammonium persulfate of different dosages.
Test result is referring to table 4.
Table 4dh-db active fracturing liquid breaks colloidality energy
Experiment finds, ammonium persulfate has good broken glue effect to dh-db active fracturing liquid, and broken gel water is thorough.
2.6 residue content
The insoluble matter residue containing in fracturing fluid can block rock stratum hole, because fracturing fluid is unworthy of with the rock on stratum and fluid
5 and cause clay swell or emulsification etc., all can cause the injury to in-place permeability.In the present embodiment, to the present invention's
Dh-db active fracturing liquid residue content after breaking gel is detected.Result is referring to table 5.
Table 5dh-db active fracturing liquid residue content is tested
From above-mentioned laboratory test results, the dh-db active fracturing liquid of the present invention no residue substantially after breaking gel, breaking glue solution
Clear, substantially no residue, and the residue content about 860mg/l of the guar gum of routine and organic boron crosslinked fracturing fluid, breaking glue solution
Obvious flocky precipitate is arranged at bottom.
2.7 HTHP static filtrations measure
Measure the leak-off that the fracturing fluid without proppant passes through filter paper under high temperature, condition of high voltage；Temperature of the measurement: pressure break
Liquid Applicable temperature scope；Measure pressure: instrument regulation test pressure reduction is 3.5mpa；Back pressure is pressed instrument requirements and is determined.Record Isosorbide-5-Nitrae,
Filter loss when 9,16,25,30,36min, with leak-off data on filter paper for the fracturing fluid, with filter loss as ordinate, with the time
Square root be abscissa, on rectangular co-ordinate map.Experimental result refers to table 6.
Filtration property experimental result under table 6 different temperatures
As seen from the above table, dh-db active fracturing liquid has good filtrate loss controllability, can meet the requirement of professional standard.
2.8 core damage performances
Although the viscosity of breaking glue solution is very low shows that fracturing fluid cracks, it is also possible to the permeability of rock core be caused hinder
Evil.In the present embodiment, the breaking glue solution of dh-db active fracturing liquid is carried out with the detection of rock core permeability, to investigate breaking glue solution to rock core
Nocuity.
1) experimental technique
Choose the natural core of surface hydrophilic, test instrument is pressure core flow tester:
Prepare the breaking glue solution of dh-db active fracturing liquid, collect filtrate；
Rock core is loaded in clamper；
Just lead to normal saline solution (40000ppm), survey core permeability k1；
Instead lead to breaking glue solution filtrate to stability of flow；
Just lead to normal saline solution (40000ppm), survey core permeability k2.
Using following formula calculating core damage rate:
2) experimental result
Experimental result is referring to table 7.
Table 7 core damage result of the test
From experimental result, dh-db active fracturing liquid to the injury rate of rock core between 5.09%～9.4%, with hpg pressure
Split liquid phase ratio, injury rate reduces by 80% about；Also it is significantly lower than conventional ves fracturing fluid.
By experiment above, the nocuity of the dh-db activity breaking glue solution of the present invention also has the following characteristics that
1. no filter cake generates, and maintains the primary permeability of hole pore throat to greatest extent；
2. no residue is formed substantially, hole wall will not be caused adsorb；
3. fracturing fluid ph value is maintained at neutrality, it is to avoid ca, mg plasma generates precipitation in the basic conditions.
2.9 prevent swollen performance
Test method: measured with clay stabilizer performance measurement method sy/t5762-1995 according to fracture acidizing.Test knot
Fruit is referring to table 8.
Table 8dh-db active fracturing liquid prevents swollen performance test results
The test of above properties can be with surface, and the fracturing fluid of the present invention has a following main feature:
1) good viscoelastic systems can be formed after the crosslinking of dh-db active fracturing liquid, there is good prop-carrying capacity；And table
See viscosity relatively low, advantageously reduce frictional resistance in work progress and improve infusion discharge capacity；
2) dh-db-1 thickening agent good dispersion, dissolution velocity in water is fast, and additive types are few, consumption is low, join liquid side
Just, the extemporaneous preparation of fracturing fluid can be smoothly completed；
3) viscoplasticity is strong, suspension is good, is not easy to build up sand setting during high sand ratio, is conducive to improving sanding concentration.
4) this fracturing fluid host be surfactant, have the characteristics that anti-swollen, be unlikely to deteriorate；Broken gel water thoroughly, will not
Cause Adsorption And Retention or impact supporting crack flow conductivity；Prepare simple, be not required to increase special installation.
Embodiment 2
Dh-db active fracturing liquid scene possesses the construction ability using continuous mixture, can meet fracturing blender truck 8-10m3/
The operational discharge capacity of min requires.
According to different reservoir temperature, determine each additive formula, according to additive dh-db-1 → dh-db-2 → dh-db-3
→ ammonium persulfate addition sequence, adds continuous mixing truck agitator tank, is configured to liquid supply fracturing blender truck.The liquid preparing is led to
Cross fracturing blender truck and send into well head, enter eventually in stratum.
The compound method of huge discharge jet-loop in the case of not having continuous mixing truck, can be taken, also can meet to mixed
Sand car provides 8-10m3The operational discharge capacity of/min requires.Additive addition sequence is identical with continuous mixture.
Live applicable cases
Example 1:
Trying 3 wells is to close down well, target zone mountain 1,90 DEG C of reservoir temperature, pressure break well section 2622.0-2626.0m flatly.For the first time
Pressure break adopts hpg crosslinked gel, and average sand compares 21.6%, sand feeding amount 35.1m3, termination of pumping pressure 27mpa.After pressure adopt 3.0mm,
4.0mm, 5.0mm oil nozzle controls open flow discharge opeing, and the later stage opens wide open flow discharge opeing, and fracturing fluid recovery (backflow) rate is 72.83%.Using one point method
Ask product, average temperature gas production 0.6400 × 104m3/ d, average product water 0.13m3/ d, calculate open-flow capacity be 2.1533 ×
104m3/d.Fracturing transformation effect is poor.
Refracturing selects dh-db activity co2Foam fracturing fluid is constructed, by fracturing liquid (0.6% thickening agent dh- during construction
Db-1+0.4% auxiliary rheological agents dh-db-2) and co2By different proportion (co2Foam quality than less than 30%) squeeze into stratum simultaneously
In, using co2The row of returning can be improved lead, contribute to increasing production further, dh-db activity co2Foam fracturing fluid construction curve is referring to figure
Shown in 7.15.0 × 10 are obtained after pressure4m3The high yield of/d.
Example 2:
Pu is deep, and 17 wells are sinopec emphasis exploration wells, pressure break well section 4646.0-4655.5m, and test reflection reservoir is high temperature
LOW PERMEABILITY RESERVOIR, real Well-temperature close to 160 degree, reservoir pressure coefficient 1.5.Using dh-db fracturing fluid (0.6% thickening agent dh-db-1+
0.4% auxiliary rheological agents dh-db-2+0.4% temperature stability agent dh-db-3) construction, live flow container sampling 150 DEG C of continuous shear stress of detection
Viscosity temperature characteristic is shown in Figure 8.Pu is deep, and 17 well sand fracturing construction curve are shown in Figure 9.In this example, complete design adds sand
30m3, day oil-producing 10m after pressure3, after pressure, yield reaches same block yield highest level.
Example 3:
Soviet Union 53-82-48h well finishing drilling well depth 5303m, horizontal segment drilling depth 1725m, sandstone Drilling ratio 96.23%, Effective Reservoirs
Drilling ratio 65.39%, 130 DEG C of formation temperature.12 sections of pressure break of design, adds haydite 474m altogether3, with fracturing fluid (0.6% thickening agent
Dh-db-1+0.4% auxiliary rheological agents dh-db-2+0.4% temperature stability agent dh-db-3) 4070m3, liquid nitrogen 174m3.
Sectional well completion tubing string meaning shown in Figure 10, segmentation sand fracturing construction curve referring to Figure 11, production curve after pressure
Referring to Figure 12.
Claims (11)
1. a kind of fracturing fluid thickening agent, this thickening agent is by viscoelastic surfactant, polyacrylamide, 2- acrylamide
Base-methyl propane sulfonic acid, methacryloxypropyl trimethyl ammonium chloride, n- N-isopropylacrylamide, heptanedioyl, piece alkali press 3:5～7:
The volume ratio synthesis of 0.4～0.6:1～2:1.5～2.5:1.5～2.5:0.8～1.2.
2. thickening agent according to claim 1, wherein, described viscoelastic surfactant is benzalkonium chloride and/or benzene is pricked
Bromine ammonium.
3. the preparation method of the thickening agent described in claim 1 or 2, the method includes:
Viscoelastic surfactant and polyacrylamide resin are mixed and heated makes it melt completely, is subsequently adding 2- acryloyl
Amido-methyl propane sulfonic acid, methacryloxypropyl trimethyl ammonium chloride, n- N-isopropylacrylamide, heptanedioyl, piece alkali, 120～
Stir more than 1 hour at a temperature of 160 DEG C, products therefrom is described thickening agent.
4. a kind of fracturing fluid compositions of additives, said composition includes the thickening agent described in claim 1 or 2.
5. composition according to claim 4, said composition also includes auxiliary rheological agents, and described auxiliary rheological agents are to be lived by surface
Property agent is formed by the volume ratio physical mixed of 1:1.5～2.5 with ethanol；
Wherein, described surfactant is benzalkonium chloride or benzalkonium bromide.
6. a kind of fracturing fluid, on the basis of the gross weight of this fracturing fluid, its component includes:
Thickening agent 0.2%～0.8% described in claim 1 or 2；
Auxiliary rheological agents 0.2%～0.8%；
Wherein said auxiliary rheological agents are to be formed by the volume ratio physical mixed of 1:1.5～2.5 with ethanol by surfactant, its
In, described surfactant is benzalkonium chloride or benzalkonium bromide.
7. fracturing fluid according to claim 6, wherein also includes temperature stability agent, and wherein, described temperature stability agent is by table
Face activating agent and straight chain alcohols material are synthesized in 1～2:2 ratio；Surfactant is benzalkonium chloride or benzalkonium bromide, and alcohols is
Ethanol.
8. application in the continuous sand fracturing of shale gas for the fracturing fluid described in claim 6 or 7.
9. application according to claim 8, wherein, is that usage right requires the fracturing fluid cooperation co described in 6 or 72Carry out
co2Mixing pressure break.
10. a kind of continuous sand fracturing method of shale gas, is wherein the fracturing fluid that usage right requires described in 6 or 7.
11. methods according to claim 10, wherein, are that usage right requires the fracturing fluid cooperation co described in 6 or 72Carry out
co2Mixing pressure break.
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| PCT/CN2014/095330 WO2015109917A1 (en) | 2014-01-21 | 2014-12-29 | Thickener for shale gas fracturing fluid, fracturing fluid and preparation method and use thereof |
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| CN103756664B (en) * | 2014-01-21 | 2017-01-25 | 东方宝麟科技发展(北京)有限公司 | Densifier and fracturing fluid for shale gas fracturing fluid, preparation method and application thereof |
| CN106289988B (en) * | 2015-05-29 | 2019-09-24 | 中国科学院地质与地球物理研究所 | Supercritical carbon dioxide rock fracture pilot system |
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| CN112410012A (en) * | 2019-08-21 | 2021-02-26 | 中国石油化工股份有限公司 | Application of modified polyacrylamide in water-based fracturing fluid |
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