CN103881693A - Inverse emulsion resistance reducing agent for fracturing of shale gas slickwater and preparation method thereof - Google Patents
Inverse emulsion resistance reducing agent for fracturing of shale gas slickwater and preparation method thereof Download PDFInfo
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- CN103881693A CN103881693A CN201410101052.8A CN201410101052A CN103881693A CN 103881693 A CN103881693 A CN 103881693A CN 201410101052 A CN201410101052 A CN 201410101052A CN 103881693 A CN103881693 A CN 103881693A
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- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 55
- 239000000839 emulsion Substances 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000000178 monomer Substances 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 17
- 239000012071 phase Substances 0.000 claims description 45
- 238000003756 stirring Methods 0.000 claims description 38
- UWNADWZGEHDQAB-UHFFFAOYSA-N 2,5-dimethylhexane Chemical group CC(C)CCC(C)C UWNADWZGEHDQAB-UHFFFAOYSA-N 0.000 claims description 22
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 19
- 239000000243 solution Substances 0.000 claims description 18
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical group [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 16
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 15
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 15
- 229920003169 water-soluble polymer Polymers 0.000 claims description 13
- 239000003995 emulsifying agent Substances 0.000 claims description 12
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical compound CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 claims description 11
- RPWFJAMTCNSJKK-UHFFFAOYSA-N Dodecyl gallate Chemical compound CCCCCCCCCCCCOC(=O)C1=CC(O)=C(O)C(O)=C1 RPWFJAMTCNSJKK-UHFFFAOYSA-N 0.000 claims description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 11
- NWGKJDSIEKMTRX-AAZCQSIUSA-N Sorbitan monooleate Chemical group CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O NWGKJDSIEKMTRX-AAZCQSIUSA-N 0.000 claims description 11
- 150000001409 amidines Chemical class 0.000 claims description 11
- 229940080643 dodecyl gallate Drugs 0.000 claims description 11
- 235000010386 dodecyl gallate Nutrition 0.000 claims description 11
- 239000000555 dodecyl gallate Substances 0.000 claims description 11
- 239000003999 initiator Substances 0.000 claims description 11
- 125000005395 methacrylic acid group Chemical group 0.000 claims description 11
- 229940047670 sodium acrylate Drugs 0.000 claims description 11
- PRXRUNOAOLTIEF-ADSICKODSA-N Sorbitan trioleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](OC(=O)CCCCCCC\C=C/CCCCCCCC)[C@H]1OC[C@H](O)[C@H]1OC(=O)CCCCCCC\C=C/CCCCCCCC PRXRUNOAOLTIEF-ADSICKODSA-N 0.000 claims description 10
- 239000008346 aqueous phase Substances 0.000 claims description 10
- 239000007864 aqueous solution Substances 0.000 claims description 8
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 8
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 8
- -1 SPAN85 compound Chemical class 0.000 claims description 7
- 239000012454 non-polar solvent Substances 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 5
- 230000000813 microbial effect Effects 0.000 claims description 5
- 241000254173 Coleoptera Species 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- PBOSTUDLECTMNL-UHFFFAOYSA-N lauryl acrylate Chemical compound CCCCCCCCCCCCOC(=O)C=C PBOSTUDLECTMNL-UHFFFAOYSA-N 0.000 claims description 3
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 claims description 2
- 238000004945 emulsification Methods 0.000 claims description 2
- 239000000600 sorbitol Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 11
- 239000007788 liquid Substances 0.000 abstract description 6
- 230000002209 hydrophobic effect Effects 0.000 abstract description 3
- 239000003208 petroleum Substances 0.000 abstract description 3
- 238000006073 displacement reaction Methods 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 abstract description 2
- 238000002347 injection Methods 0.000 abstract description 2
- 239000007924 injection Substances 0.000 abstract description 2
- 238000012688 inverse emulsion polymerization Methods 0.000 abstract description 2
- 238000002156 mixing Methods 0.000 abstract 1
- 238000010008 shearing Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 18
- 238000001802 infusion Methods 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000006116 polymerization reaction Methods 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000003825 pressing Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 4
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- 125000000129 anionic group Chemical group 0.000 description 3
- 238000006392 deoxygenation reaction Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 239000013543 active substance Substances 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000001603 reducing effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012674 dispersion polymerization Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- PYGSKMBEVAICCR-UHFFFAOYSA-N hexa-1,5-diene Chemical group C=CCCC=C PYGSKMBEVAICCR-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 125000004368 propenyl group Chemical group C(=CC)* 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
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- C—CHEMISTRY; METALLURGY
- 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
- C09K8/66—Compositions based on water or polar solvents
- C09K8/665—Compositions based on water or polar solvents containing inorganic 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
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- Chemical Kinetics & Catalysis (AREA)
- Polymerisation Methods In General (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention discloses an inverse emulsion resistance reducer for shale gas slickwater fracturing fluid and a preparation method thereof, and relates to the technical field of petroleum engineering. The drag reducer introduces long-chain hydrophobic monomers, improves the shearing resistance of the drag reducer in the high-displacement pump injection process, is prepared by inverse emulsion polymerization, is liquid and instant, meets the liquid preparation requirement of the shale gas fracturing continuous blending construction process, is used in site with the addition of 0.06-0.8 percent of the mass of clear water, and has the drag reduction rate of 73 percent at most.
Description
Technical field
The present invention relates to petroleum engineering technical field, be specifically related to a kind of shale gas slippery water pressure break reversed-phase emulsion friction reducer and preparation method thereof.
Background technology
As the shale gas of unconventional petroleum resources, its reservoir reconstruction technique and conventional gas and oil resource have a great difference.In order to link up to greatest extent or to open the Fracture System in reservoir, shale gas reservoir volume increase transformation adopts large liquid measure, large discharge capacity fracturing technique.For shale gas volume increase transformation demand, reduce the energy waste that fracturing liquid fluid causes because of high infusion pressure influence generation turbulent flow in pumping procedure, improve infusion discharge capacity and the liquid injection rate under identical infusion discharge capacity particularly important.
Publication number is CN1487985A, the Chinese patent literature that open day is on April 7th, 2004 discloses a kind of surfactant-based friction reducer, relates to zwitterionics and ether sulfate or ether carboxylate tensio-active agent and is combined in the application as flow improver in aqueous based systems.But this class flow improver need to reach the micelle-forming concentration of tensio-active agent could be used above, and working concentration is high, is not suitable for shale gas low cost development demand.
Publication number is CN103333672A, within open day, be that the Chinese patent literature on October 2nd, 2013 discloses the application that made by acrylamide and propenyl tri alkyl ammomium chloride or alkyl acrylamide base tri alkyl ammomium chloride or the polymerization of dialkyl diallyl aqueous ammonium chloride solution and the sodium salt friction reducer of shale gas reservoir, friction reducer prepared by the method is pulvis, and pulvis is not suitable in the extensive shale gas pressing crack construction that adopts continuous mixture construction technology.
Publication number is CN102977877A, the Chinese patent literature that open day is on March 20th, 2013 discloses shale gas pressure break flow improver being made by acrylamide, sodium acrylate and 2-acrylamide-2 methyl propane sulfonic acid sodium and preparation method thereof, the method needs first to prepare stablizer by aqueous solution polymerization, prepare flow improver by dispersion polymerization again, in preparation process, need logical nitrogen deoxygenation and preparation time long (total reaction time is more than 20h) simultaneously, complex manufacturing, be unfavorable for suitability for industrialized production, this friction reducer solid content is low simultaneously, and dosage is larger in use.
Summary of the invention
The present invention is intended to for the existing defect of above-mentioned prior art and deficiency, a kind of shale gas slippery water pressure break reversed-phase emulsion friction reducer is provided, adopt the present invention, structural stability and resistance-reducing performance under high infusion discharge capacity are improved, this friction reducer is product emulsion simultaneously, be easy to dosing, be applicable to the extensive shale gas pressing crack construction of continuous mixture construction technology.
Simultaneously, the present invention also provides the preparation method of shale gas slippery water pressure break reversed-phase emulsion friction reducer, the method adopts super dense inverse emulsion polymerization, water accounts for system 70%～80%, solid content is high, and gained friction reducer just can reach good resistance reducing effect under low dosage condition, and in the time producing, one-step polymerization obtains product simultaneously, without logical nitrogen deoxygenation, production time section, greatly simplify production technique.
The present invention is by adopting following technical proposals to realize:
A kind of shale gas slippery water pressure break reversed-phase emulsion friction reducer, is characterized in that: by percentage to the quality, the proportioning of each component is as follows:
High molecular weight water soluble polymer 30%～37.5%;
Non-polar solvent 20%～25%;
Oil-soluble emulsifier 2.5%～2.75%;
Solubility promoter 0.2%～0.3%;
All the other are water.
Described high molecular weight water soluble polymer is the multipolymer of acrylamide, sodium acrylate and three kinds of monomers of methacrylic dodecyl gallate, in high molecular weight water soluble polymer, the mass percent of described acrylamide is 65%～70%, and the mass percent of described sodium acrylate is 29%～33%; The mass percent of described water beetle base dodecyl acrylate is 1%～2%; Initiator in high molecular weight water soluble polymer is azo diisobutyl amidine hydrochloride and sodium bisulfite composite initiator, wherein, azo diisobutyl amidine hydrochloride accounts for 0.1%～0.3% of described three kinds of monomer total masses, and sodium bisulfite accounts for 0.1%～0.4% of described three kinds of monomer total masses.
Described non-polar solvent is 15# white oil.
Described oil-soluble emulsifier is sorbitan mono-oleic acid ester and SPAN85 compound emulsifying agent, and wherein the mass ratio of sorbitan mono-oleic acid ester and SPAN85 is 8～9:1～2.
Described solubility promoter is sodium bicarbonate.
A preparation method for reversed-phase emulsion friction reducer for shale gas slippery water pressure break, is characterized in that step is as follows:
1) prepare acrylamide, sodium acrylate and three kinds of monomers of methacrylic dodecyl gallate, first by soluble in water the sodium acrylate that accounts for three kinds of monomer total masses 23%～29%, add again account for three kinds of monomer total masses 70%～75% acrylamide, account for three kinds of monomer total masses, 0.1%～0.3% initiator azo diisobutyl amidine hydrochloride and account for the solubility promoter sodium bicarbonate of prepared friction reducer total mass 0.2%～0.3%, stirring and dissolving obtains aqueous phase solution;
2) in the 15# white oil that accounts for prepared friction reducer total mass 20%～25%, add the emulsifier sorbitol acid anhydride monoleate and the SPAN85 that account for prepared friction reducer total mass 2.5%～2.75%, wherein: the mass ratio of sorbitan mono-oleic acid ester and SPAN85 is 8～9:1～2; In described 15# white oil, add again the methacrylic dodecyl gallate that accounts for three kinds of monomer total masses 1%～2%, stir and obtain oil phase;
3) by above-mentioned 1) aqueous phase solution that obtains in step is added dropwise to above-mentioned 2 under continuously stirring state) in the oil phase that obtains of step, dropwise rear emulsification 30min and obtain reversed-phase emulsion;
4) under 15～25 ℃, continuously stirring state to above-mentioned 3) drip the aqueous solution of sodium bisulfite that accounts for three kinds of monomer total masses 0.1%～0.4% in the reversed-phase emulsion that obtains of step, after dropwising, stop stirring when also standing and reacting to system temperature rises to 35 ℃ and start and stir, be continuously stirring to and when temperature no longer changes, stop stirring and leave standstill insulation after 4 hours, naturally be cooled to blowing after envrionment temperature, obtain reversed-phase emulsion friction reducer.
In described step 1), acrylamide selects acrylamide performance prepared by microbial method more.
Compared with prior art, the beneficial effect that the present invention reaches is as follows:
1, select " high molecular weight water soluble polymer 30%～37.5%; Non-polar solvent 20%～25%; Oil-soluble emulsifier 2.5%～2.75%; Solubility promoter 0.2%～0.3%; All the other are water " friction reducer of specific like this proportioning, improve structural stability and resistance-reducing performance under high infusion discharge capacity, this friction reducer is product emulsion simultaneously, is easy to dosing, is applicable to the extensive shale gas pressing crack construction of continuous mixture construction technology
2, through overtesting, when recording this reversed-phase emulsion friction reducer and dissolving in water, tackify rapidly, in 3min, solution apparent viscosity can reach stable viscosity more than 90%.Therefore in the extensive fracturing reform process of shale gas, can adopt continuous mixture technique to carry out dosing construction, liquid friction reducer product can directly pump into manifold by metering with proportioning pump, reduces greatly construction dosing workload, improves operating efficiency.
3, to have adopted the hydrophobic methacrylic dodecyl gallate of long-chain be function monomer to reversed-phase emulsion friction reducer provided by the invention, utilizes hydrophobic association effect to strengthen friction reducer molecule (5～16 m under the high infusion discharge capacity of pressing crack construction at the scene
3/ min) there is good molecular structure stabilized.
4, reversed-phase emulsion friction reducer provided by the invention only need obtain product by one-step polymerization in process of production, and can reach product application performance without passing into nitrogen deoxygenation in production process, production time short (6h left and right), greatly simplify production process, reduced production cost.
5, to fall dosage low for reversed-phase emulsion friction reducer provided by the invention, and resistance reducing effect is good, and in shale gas slippery water pressing crack construction, under 0.05%～0.1% friction reducer dosage condition, its resistance-reducing yield can reach more than 70% at the scene.
6, providing following contrast experiment's data, illustrate in this preparation method the 4th with this) selection of the parameters of step has specific reason:
| Comparative example | The temperature of reversed-phase emulsion (℃) | After aqueous solution of sodium bisulfite dropwises, start stir time system temperature (℃) | Standing soaking time (hour) | Comparing result |
| 1 | 15～25 | 35 | 4 | Polymerization is steady, and product is placed stable, and resistance-reducing yield can reach more than 70% |
| 2 | 25～30 | 35 | 4 | Polymerization is steady, and product shelf-stability is poor, very easily after blowing, occurs and breakdown of emulsion caking sudden and violent gathering in 24 hours |
| 3 | 15～25 | 25～30 | 4 | Polymerization is steady, and product is poor at non-lucifuge place shelf-stability, and in 2 days, autohemagglutination caking, place and stablize, but resistance-reducing yield is only 30% left and right at lucifuge place |
| 4 | 15～25 | More than 40 | 4 | Polymerization in early stage is steady, and after temperature rises to more than 40 ℃, polymerization temperature climbing speed is sharply accelerated, then drives agitator and water coolant is also difficult to control rising sharply of temperature, and material sudden and violent coalescence in reactor is lumpd |
| 5 | 15～25 | 35 | 1～3 | Polymerization is steady, and product has autohemagglutination exothermic phenomenon while placement at non-lucifuge place, but does not occur breakdown of emulsion caking, places and stablizes at lucifuge place, and resistance-reducing yield is in 50% left and right |
Accompanying drawing explanation
Below in conjunction with specification drawings and specific embodiments, the present invention is described in further detail, wherein:
Fig. 1 is the friction test graphic representation under the coiled tubing, 700 type fracturing truck infusions, 0.1% reversed-phase emulsion friction reducer dosage condition of the long internal diameter 25.4mm of 375m.
Fig. 2 is the frictional resistance graphic representation of the relative clear water of the friction reducer aqueous solution under different displacements under above-mentioned test condition.
Embodiment
embodiment 1(presses 400kg and produces)
In reactor, add 121.7kg clear water, add the anionic monomer acrylic acid of 30kg, add the sodium hydroxide solution of 16.7kg sodium hydroxide and the preparation of 25kg clear water, regulate pH value in 6.5 left and right, add the solubility promoter sodium bicarbonate of non-ionic monomer microbial method acrylamide, 0.3kg initiator azo diisobutyl amidine hydrochloride and the 1kg of 98.5kg, be stirred to completely and dissolve and obtain aqueous phase solution; The oil-soluble monomer methacrylic dodecyl gallate that adds 9kg sorbitan mono-oleic acid ester and 1kg SPAN85 and 1.5kg in the 15# of 90kg white oil, stirs and obtains oil phase; Above-mentioned aqueous phase solution is added dropwise in oil phase under continuously stirring state, dropwises rear emulsify at a high speed 30min and obtain stable reversed-phase emulsion system; With 5kg clear water dissolving 0.3kg sodium bisulfite, under 20 ℃, continuously stirring state, in reversed-phase emulsion system obtained above, drip this aqueous solution of sodium bisulfite, when stopping to stir standing and reacting to system temperature after dropwising and rising to 35 ℃, start and stir, be continuously stirring to stop stirring when temperature no longer changes and leave standstill insulation and after 4 hours, be naturally cooled to blowing after envrionment temperature, obtain homogeneous, stable reversed-phase emulsion friction reducer.Get 10kg friction reducer and add 10m
3in clear water (friction reducer mass percentage concentration is 0.1%), adopt the coiled tubing of the long internal diameter 25.4mm of 375m, with 700 type fracturing truck infusion friction reducer solution, record resistance-reducing yield and can reach 70.7%.
embodiment 2(presses 400kg and produces)
In reactor, add 121.6kg clear water, add the anionic monomer acrylic acid of 32kg, add the sodium hydroxide solution of 17.8kg sodium hydroxide and the preparation of 25kg clear water, regulate pH value in 6.5 left and right, add the solubility promoter sodium bicarbonate of non-ionic monomer microbial method acrylamide, 0.15kg initiator azo diisobutyl amidine hydrochloride and the 1kg of 96kg, be stirred to completely and dissolve and obtain aqueous phase solution; The oil-soluble monomer methacrylic dodecyl gallate that adds 9kg sorbitan mono-oleic acid ester and 1kg SPAN85 and 2kg in the 15# of 90kg white oil, stirs and obtains oil phase; Above-mentioned aqueous phase solution is added dropwise in oil phase under continuously stirring state, dropwises rear emulsify at a high speed 30min and obtain stable reversed-phase emulsion system; With 5kg clear water dissolving 0.45kg sodium bisulfite, under 20 ℃, continuously stirring state, in reversed-phase emulsion system obtained above, drip this aqueous solution of sodium bisulfite, when stopping to stir standing and reacting to system temperature after dropwising and rising to 35 ℃, start and stir, be continuously stirring to stop stirring when temperature no longer changes and leave standstill insulation and after 4 hours, be naturally cooled to blowing after envrionment temperature, obtain homogeneous, stable reversed-phase emulsion friction reducer.Get 10kg friction reducer and add 10m
3in clear water (friction reducer mass percentage concentration is 0.1%), adopt the coiled tubing of the long internal diameter 25.4mm of 375m, with 700 type fracturing truck infusion friction reducer solution, record resistance-reducing yield and can reach 70.2%.
embodiment 3(presses 400kg and produces)
In reactor, add 116.6kg clear water, add the anionic monomer acrylic acid of 35kg, add the sodium hydroxide solution of 19.5kg sodium hydroxide and the preparation of 25kg clear water, regulate pH value in 6.5 left and right, add the solubility promoter sodium bicarbonate of non-ionic monomer microbial method acrylamide, 0.3kg initiator azo diisobutyl amidine hydrochloride and the 1kg of 95kg, be stirred to completely and dissolve and obtain aqueous phase solution; The oil-soluble monomer methacrylic dodecyl gallate that adds 8.5kg sorbitan mono-oleic acid ester and 1.5kg SPAN85 and 2kg in the 15# of 90kg white oil, stirs and obtains oil phase; Above-mentioned aqueous phase solution is added dropwise in oil phase under continuously stirring state, dropwises rear emulsify at a high speed 30min and obtain stable reversed-phase emulsion system; With 5kg clear water dissolving 0.6kg sodium bisulfite, under 20 ℃, continuously stirring state, in reversed-phase emulsion system obtained above, drip this aqueous solution of sodium bisulfite, when stopping to stir standing and reacting to system temperature after dropwising and rising to 35 ℃, start and stir, be continuously stirring to stop stirring when temperature no longer changes and leave standstill insulation and after 4 hours, be naturally cooled to blowing after envrionment temperature, obtain homogeneous, stable reversed-phase emulsion friction reducer.Get 10kg friction reducer and add 10m
3in clear water (friction reducer mass percentage concentration is 0.1%), adopt the coiled tubing of the long internal diameter 25.4mm of 375m, with 700 type fracturing truck infusion friction reducer solution, record resistance-reducing yield and can reach 68.7%.
embodiment 4
As a preferred embodiments of the present invention, its shale gas slippery water pressure break reversed-phase emulsion friction reducer, by percentage to the quality, the proportioning of each component is as follows: high molecular weight water soluble polymer 35%; Non-polar solvent 23%; Oil-soluble emulsifier 2.5%; Solubility promoter 0.25%; All the other are water.Described high molecular weight water soluble polymer is the multipolymer of acrylamide, sodium acrylate and three kinds of monomers of methacrylic dodecyl gallate, in high molecular weight water soluble polymer, the mass percent of described acrylamide is 70%, and the mass percent of described sodium acrylate is 29%; The mass percent of described water beetle base dodecyl acrylate is 1%; Initiator in high molecular weight water soluble polymer is azo diisobutyl amidine hydrochloride and sodium bisulfite composite initiator, wherein, azo diisobutyl amidine hydrochloride accounts for 0.2% of described three kinds of monomer total masses, and sodium bisulfite accounts for 0.3% of described three kinds of monomer total masses.Described non-polar solvent is 15# white oil.Described oil-soluble emulsifier is sorbitan mono-oleic acid ester and SPAN85 compound emulsifying agent, and wherein the mass ratio of sorbitan mono-oleic acid ester and SPAN85 is 8～9:1～2.Described solubility promoter is sodium bicarbonate.
Claims (7)
1. a shale gas slippery water pressure break reversed-phase emulsion friction reducer, is characterized in that: by percentage to the quality, the proportioning of each component is as follows:
High molecular weight water soluble polymer 30%～37.5%;
Non-polar solvent 20%～25%;
Oil-soluble emulsifier 2.5%～2.75%;
Solubility promoter 0.2%～0.3%;
All the other are water.
2. described shale gas slippery water pressure break reversed-phase emulsion friction reducer according to claim 1, it is characterized in that: high molecular weight water soluble polymer is the multipolymer of acrylamide, sodium acrylate and three kinds of monomers of methacrylic dodecyl gallate, in high molecular weight water soluble polymer, the mass percent of described acrylamide is 65%～70%, and the mass percent of described sodium acrylate is 29%～33%; The mass percent of described water beetle base dodecyl acrylate is 1%～2%; Initiator in high molecular weight water soluble polymer is azo diisobutyl amidine hydrochloride and sodium bisulfite composite initiator, wherein, azo diisobutyl amidine hydrochloride accounts for 0.1%～0.3% of described three kinds of monomer total masses, and sodium bisulfite accounts for 0.1%～0.4% of described three kinds of monomer total masses.
3. described shale gas slippery water pressure break reversed-phase emulsion friction reducer according to claim 1, is characterized in that: described non-polar solvent is 15# white oil.
4. described shale gas slippery water pressure break reversed-phase emulsion friction reducer according to claim 1, it is characterized in that: described oil-soluble emulsifier is sorbitan mono-oleic acid ester and SPAN85 compound emulsifying agent, and wherein the mass ratio of sorbitan mono-oleic acid ester and SPAN85 is 8～9:1～2.
5. described shale gas slippery water pressure break reversed-phase emulsion friction reducer according to claim 1, is characterized in that: described solubility promoter is sodium bicarbonate.
6. a preparation method for reversed-phase emulsion friction reducer for shale gas slippery water pressure break, is characterized in that step is as follows:
1) prepare acrylamide, sodium acrylate and three kinds of monomers of methacrylic dodecyl gallate, first by soluble in water the sodium acrylate that accounts for three kinds of monomer total masses 23%～29%, add again account for three kinds of monomer total masses 70%～75% acrylamide, account for three kinds of monomer total masses, 0.1%～0.3% initiator azo diisobutyl amidine hydrochloride and account for the solubility promoter sodium bicarbonate of prepared friction reducer total mass 0.2%～0.3%, stirring and dissolving obtains aqueous phase solution;
2) in the 15# white oil that accounts for prepared friction reducer total mass 20%～25%, add the emulsifier sorbitol acid anhydride monoleate and the SPAN85 that account for prepared friction reducer total mass 2.5%～2.75%, wherein: the mass ratio of sorbitan mono-oleic acid ester and SPAN85 is 8～9:1～2; In described 15# white oil, add again the methacrylic dodecyl gallate that accounts for three kinds of monomer total masses 1%～2%, stir and obtain oil phase;
3) by above-mentioned 1) aqueous phase solution that obtains in step is added dropwise to above-mentioned 2 under continuously stirring state) in the oil phase that obtains of step, dropwise rear emulsification 30min and obtain reversed-phase emulsion;
4) under 15～25 ℃, continuously stirring state to above-mentioned 3) drip the aqueous solution of sodium bisulfite that accounts for three kinds of monomer total masses 0.1%～0.4% in the reversed-phase emulsion that obtains of step, after dropwising, stop stirring when also standing and reacting to system temperature rises to 35 ℃ and start and stir, be continuously stirring to and when temperature no longer changes, stop stirring and leave standstill insulation after 4 hours, naturally be cooled to blowing after envrionment temperature, obtain reversed-phase emulsion friction reducer.
7. described shale gas slippery water pressure break reversed-phase emulsion friction reducer according to claim 6, is characterized in that: in described step 1), acrylamide selects acrylamide performance prepared by microbial method more.
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