CN108641700B - Multi-effect fracturing additive and preparation method and application thereof - Google Patents
Multi-effect fracturing additive and preparation method and application thereof Download PDFInfo
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- 239000000654 additive Substances 0.000 title claims abstract description 51
- 230000000996 additive effect Effects 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title abstract description 13
- 239000012530 fluid Substances 0.000 claims abstract description 57
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 31
- 239000004927 clay Substances 0.000 claims abstract description 28
- 239000003381 stabilizer Substances 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 150000001412 amines Chemical class 0.000 claims abstract description 20
- 239000002280 amphoteric surfactant Substances 0.000 claims abstract description 20
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 11
- 230000000844 anti-bacterial effect Effects 0.000 claims abstract description 11
- 239000003899 bactericide agent Substances 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 229920000570 polyether Polymers 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 150000003863 ammonium salts Chemical group 0.000 claims abstract description 7
- 238000005303 weighing Methods 0.000 claims abstract description 6
- -1 octadecyl dihydroxyethyl Chemical group 0.000 claims description 8
- 239000001763 2-hydroxyethyl(trimethyl)azanium Substances 0.000 claims description 6
- 235000019743 Choline chloride Nutrition 0.000 claims description 6
- 229960003178 choline chloride Drugs 0.000 claims description 6
- SGMZJAMFUVOLNK-UHFFFAOYSA-M choline chloride Chemical group [Cl-].C[N+](C)(C)CCO SGMZJAMFUVOLNK-UHFFFAOYSA-M 0.000 claims description 6
- 229940031728 cocamidopropylamine oxide Drugs 0.000 claims description 5
- 239000008236 heating water Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 4
- 235000019270 ammonium chloride Nutrition 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 13
- 239000000839 emulsion Substances 0.000 abstract description 8
- 230000002265 prevention Effects 0.000 abstract description 6
- 230000001954 sterilising effect Effects 0.000 abstract description 4
- 238000004659 sterilization and disinfection Methods 0.000 abstract description 4
- 230000002195 synergetic effect Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 10
- 239000003921 oil Substances 0.000 description 7
- 239000012752 auxiliary agent Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000010779 crude oil Substances 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 238000005755 formation reaction Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 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 3
- 239000004480 active ingredient Substances 0.000 description 3
- 239000003139 biocide Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 2
- 230000002579 anti-swelling effect Effects 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000003115 biocidal effect Effects 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000004945 emulsification Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 239000004160 Ammonium persulphate Substances 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 1
- 235000019395 ammonium persulphate Nutrition 0.000 description 1
- 230000008485 antagonism Effects 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 229920013818 hydroxypropyl guar gum Polymers 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
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- 239000011148 porous material Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 230000019086 sulfide ion homeostasis Effects 0.000 description 1
- 241001148471 unidentified anaerobic bacterium Species 0.000 description 1
- 239000002569 water oil cream Substances 0.000 description 1
Classifications
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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
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
- C09K8/685—Compositions based on water or polar solvents containing organic compounds containing cross-linking agents
-
- 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
- C09K8/602—Compositions for stimulating production by acting on the underground formation containing surfactants
- C09K8/604—Polymeric surfactants
-
- 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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
The invention discloses a multi-effect fracturing additive which is prepared from the following raw materials in parts by weight: 10-20 parts of clay stabilizer, 8-15 parts of amine oxide type amphoteric surfactant, 5-10 parts of synergist, 7-10 parts of wrapping agent and 45-70 parts of water, wherein the synergist is prepared by the following method: weighing 25-40 parts of methanol into a reaction device, starting a stirrer, adding 25-40 parts of block polyether demulsifier into the stirrer, and reacting for 1 hour; then heating to 50 ℃, adding 20-50 parts of biquaternary ammonium salt bactericide, and reacting for 1 h; meanwhile, the invention also discloses a preparation method and application of the multi-effect fracturing additive, and the prepared fracturing additive has good compatibility among the components, can generate a synergistic effect, has better effects than single-agent use, has good functions of sterilization, drainage assistance, emulsion breaking and expansion prevention, realizes the purpose of one agent with multiple effects, and reduces the damage of the fracturing fluid to the stratum.
Description
Technical Field
The invention belongs to the technical field of oil and gas field fracturing, and particularly relates to a multi-effect fracturing auxiliary agent and a preparation method and application thereof.
Background
The foreign fluids that perform fracturing and acidizing treatments on oilfield reservoirs are commonly referred to as fracturing fluids. The entry of water-based fracturing fluids used in oilfield development into reservoirs can subject oilfield reservoirs to a variety of insults, whether in highly permeable or low permeable formations. The reservoir of the low-permeability oilfield mainly comprises siltstone and fine sandstone, the permeability of the reservoir is poor, the radius of a pore throat of an oil-gas layer is small, and the problems of oil-water emulsification, residue blockage, water lock damage and the like are easily caused in the fracturing and acidizing treatment process. After the fracturing process is finished, the residual liquid of the fracturing fluid needs to be discharged from the reservoir. All fracturing fluids require chemical additives to improve the performance of their fluids.
Currently, there are many chemical additives used to improve the performance of fracturing fluids, such as anti-swelling agents, cleanup additives, foamer biocides, demulsifiers, and the like. The addition of some biocide to the fracturing fluid eliminates surface degradation of the polymer in the tank, and the production of anaerobic bacteria in the formation can be stopped by a suitable biocide. Many formations are sour from formation crude oil due to hydrogen sulfide production by sulfate-reducing bacteria. In addition, because the sandstone oil-gas reservoir has high clay content and high water sensitivity, the sandstone oil-gas reservoir can generate hydration expansion and dispersion migration after meeting water, block an oil-gas layer and reduce the permeability of the oil-gas layer. Therefore, the clay stabilizer can prevent hydration expansion and dispersion migration of clay minerals in the oil-gas layer. When the oil well is subjected to water-based fracturing, the water-based fracturing fluid and the crude oil of the stratum can form an oil-water emulsion. The natural emulsifier in the crude oil is attached to the water drops to form a protective film, so that the emulsion has higher stability. If emulsification is generated near a well hole, serious production blockage can occur, so that a demulsifier needs to be added, and the demulsifier can be strongly adsorbed on an oil/water interface to replace an original firm protective film, so that the strength of the interface film is greatly reduced, the protective effect is weakened, and the aim of demulsification and prevention can be achieved. All the well entering fluids can cause damage to the permeability of a reservoir stratum, and in order to achieve a good fracturing effect, the flowback of fracturing fluid must be enhanced. The cleanup additive can improve the flowback rate of the fracturing fluid and reduce the damage of the fracturing fluid to the reservoir of the oil field.
However, these chemical additives are relatively unique in their properties and are typically added individually to the fracturing fluid to alter a particular property of the fracturing fluid. Because the field situation is complex during fracturing, several additives are often required to be added simultaneously or sequentially to solve the corresponding problems, although the additives have good performance when being added as single agents, the compatibility of different products in a system is poor, the synergistic effect is not ideal, even antagonism can be generated due to different products of various manufacturers, and each single agent cannot exert the respective best effect, so that the comprehensive performance of the whole system of the fracturing fluid is reduced, the stratum is seriously damaged, and the production cost of oil and gas development is increased.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a multi-effect fracturing additive and a preparation method and application thereof, and the fracturing additive has higher sterilization, drainage assistance, emulsion breaking and expansion prevention effects, can improve the overall effect of a fracturing fluid, reduce the damage of the fracturing fluid to a stratum and increase the yield of oil gas.
A multi-effect fracturing additive is composed of the following raw materials in parts by weight: 10-20 parts of clay stabilizer, 8-15 parts of amine oxide type amphoteric surfactant, 5-10 parts of synergist, 7-10 parts of wrapping agent, 45-70 parts of water,
wherein, the synergist is prepared by the following method:
weighing 25-40 parts of methanol into a reaction device, starting a stirrer, adding 25-40 parts of block polyether demulsifier into the stirrer, and reacting for 1 hour; then heating to 50 ℃, adding 20-50 parts of biquaternary ammonium salt bactericide, and reacting for 1 h.
Preferably, the wrapping agent is OP-10 or OP-20, and the synergist can be wrapped.
Preferably, the clay stabilizer is choline chloride or polymethacryloxyethyltrimethyl ammonium chloride.
Preferably, the amine oxide type amphoteric surfactant is one of octadecyl dihydroxyethyl amine oxide, tetradecyl dihydroxyethyl amine oxide, or cocamidopropyl amine oxide.
Preferably, the block polyether demulsifier is one of TA1031, AF6231 and AF 3125.
The preparation method of the multi-effect fracturing additive comprises the following steps:
(1) heating water to 40 ℃, starting stirring, adding a clay stabilizer, and reacting for 1 h;
(2) adding an amine oxide type amphoteric surfactant into the product obtained in the step (1), and reacting for 1 h;
(3) adding a synergist into the product obtained in the step (2), heating to 40-60 ℃, and reacting for 2 hours;
(4) and (4) adding a wrapping agent into the product obtained in the step (3), and reacting for 30-60 min.
The application of the multi-effect fracturing additive is that the multi-effect fracturing additive is added into a base fluid of a fracturing fluid, and the mass of the multi-effect fracturing additive accounts for 0.25-0.4% of the total mass of the fracturing fluid.
The synergist prepared in the formula can be strongly adsorbed on an oil/water interface, so that the strength of an interfacial film is greatly reduced, the protection effect is weakened, and the growth of bacteria in a stratum can be prevented.
The parts referred to in the invention are parts by weight.
The invention has the advantages that:
the fracturing auxiliary agent prepared by the invention has good compatibility among all components, can generate a synergistic effect, has better effects than a single agent, has good functions of sterilization, drainage assistance, emulsion breaking and expansion prevention, realizes the purpose of one agent with multiple effects, improves the overall performance of the fracturing fluid, ensures that the fracturing fluid has better rheological property and wettability, and simultaneously reduces the damage of the fracturing fluid to a stratum; the multi-effect fracturing additive is simple in preparation method, is added into fracturing fluid on site, and is simple to operate.
Detailed Description
Preparation of the synergist
A synergist A: weighing 25 parts of methanol into a reaction kettle, starting a stirrer, adding 25 parts of block polyether demulsifier TA1031, and reacting for 1 h; then heating to 50 ℃, adding 20 parts of biquaternary ammonium salt bactericide, and reacting for 1 h.
A synergist B: weighing 40 parts of methanol into a reaction kettle, starting a stirrer, adding 40 parts of block polyether demulsifier AF6231, and reacting for 1 h; then heating to 50 ℃, adding 50 parts of biquaternary ammonium salt bactericide, and reacting for 1 h.
And (3) a synergist C: weighing 30 parts of methanol into a reaction kettle, starting a stirrer, adding a 30-block polyether demulsifier AF3125, and reacting for 1 h; then heating to 50 ℃, adding 35 parts of biquaternary ammonium salt bactericide, and reacting for 1 h.
Example 1
1. A multi-effect fracturing additive is composed of the following raw materials in parts by weight: 10 parts of clay stabilizer, 8 parts of amine oxide type amphoteric surfactant, 5 parts of synergist A, 7 parts of wrapping agent and 45 parts of water,
wherein the wrapping agent is OP-10;
the clay stabilizer is choline chloride;
the amine oxide type amphoteric surfactant is octadecyl dihydroxyethyl amine oxide.
2. The preparation method of the multi-effect fracturing additive comprises the following steps:
(1) heating water to 40 ℃ in a reaction kettle, starting stirring, adding a clay stabilizer, and reacting for 1 h;
(2) adding an amine oxide type amphoteric surfactant into the product obtained in the step (1), and reacting for 1 h;
(3) adding a synergist A into the product obtained in the step (2), heating to 40 ℃, and reacting for 2 hours;
(4) and (4) adding a wrapping agent into the product obtained in the step (3), and reacting for 30 min.
Example 2
1. A multi-effect fracturing additive is composed of the following raw materials in parts by weight: 20 parts of clay stabilizer, 15 parts of amine oxide type amphoteric surfactant, 10 parts of synergist A, 10 parts of wrapping agent and 70 parts of water,
wherein the wrapping agent is OP-20;
the clay stabilizer is polymethacryloxyethyl trimethyl ammonium chloride;
the amine oxide type amphoteric surfactant is tetradecyl dihydroxyethyl amine oxide.
2. The preparation method of the multi-effect fracturing additive comprises the following steps:
(1) heating water to 40 ℃ in a reaction kettle, starting stirring, adding a clay stabilizer, and reacting for 1 h;
(2) adding an amine oxide type amphoteric surfactant into the product obtained in the step (1), and reacting for 1 h;
(3) adding a synergist A into the product obtained in the step (2), heating to 60 ℃, and reacting for 2 hours;
(4) and (4) adding a wrapping agent into the product obtained in the step (3), and reacting for 60 min.
Example 3
1. A multi-effect fracturing additive is composed of the following raw materials in parts by weight: 13 parts of clay stabilizer, 12 parts of amine oxide type amphoteric surfactant, 10 parts of synergist B, 9 parts of wrapping agent and 56 parts of water,
wherein the wrapping agent is OP-10;
the clay stabilizer is polymethacryloxyethyl trimethyl ammonium chloride;
the amine oxide type amphoteric surfactant is octadecyl dihydroxyethyl amine oxide.
2. The preparation method of the multi-effect fracturing additive comprises the following steps:
(1) heating water to 40 ℃ in a reaction kettle, starting stirring, adding a clay stabilizer, and reacting for 1 h;
(2) adding an amine oxide type amphoteric surfactant into the product obtained in the step (1), and reacting for 1 h;
(3) adding a synergist B into the product obtained in the step (2), heating to 50 ℃, and reacting for 2 hours;
(4) and (4) adding a wrapping agent into the product obtained in the step (3), and reacting for 60 min.
Example 4
1. A multi-effect fracturing additive is composed of the following raw materials in parts by weight: 15 parts of clay stabilizer, 10 parts of amine oxide type amphoteric surfactant, 7 parts of synergist B, 8 parts of wrapping agent and 62 parts of water,
wherein the wrapping agent is OP-20;
the clay stabilizer is choline chloride;
the amine oxide type amphoteric surfactant is cocamidopropyl amine oxide.
2. The preparation method of the multi-effect fracturing additive is the same as that of example 3.
Example 5
1. A multi-effect fracturing additive is composed of the following raw materials in parts by weight: 13 parts of clay stabilizer, 13 parts of amine oxide type amphoteric surfactant, 5 parts of synergist C, 8 parts of wrapping agent and 58 parts of water,
wherein the wrapping agent is OP-10;
the clay stabilizer is choline chloride;
the amine oxide type amphoteric surfactant is cocamidopropyl amine oxide.
2. The preparation method of the multi-effect fracturing additive is the same as that of example 4.
Performance testing of multi-effect fracturing additive
The multiple-effect fracturing additive prepared in each example is tested for the performances of expansion prevention rate, surface interfacial tension, emulsion breaking rate, base fluid viscosity reduction rate and the like.
Wherein the anti-swelling rate is measured by the method specified in SY/T5971-2016 oil and gas field fracturing acidification and clay stabilizer performance evaluation method for water injection, and the concentration of the multi-effect fracturing additive aqueous solution is 1% (w/w);
the surface tension and the interfacial tension are measured by the method specified in SY/T5755-2016 cleanup additive performance evaluation method for fracture acidizing, and the concentration of the multi-effect fracturing additive aqueous solution is 0.3% (w/w);
the demulsification rate is performed according to the specification of 6.15.1 in a water-based fracturing fluid performance evaluation method SY/T5107: emulsifying the fracturing fluid gel breaking liquid and the crude oil according to the proportion of 1:1 at 35 ℃, respectively recording the volume of the separated gel breaking liquid for 15min, 30min, 60min and 90min, and calculating the emulsion breaking rate;
the determination of the viscosity reduction rate of the base fluid is carried out according to the specification of 5.2 in a water-based fracturing fluid performance evaluation method SY/T5107, wherein the concentration of hydroxypropyl guar gum is 0.4 percent, and the concentration of the multi-effect fracturing auxiliary agent is 0.1 percent.
The test results are shown in table 1.
Table 1 performance test results of multiple effect fracturing aids
As can be seen from Table 1, the multi-effect fracturing additive prepared by the invention has good functions of sterilization, drainage assistance, emulsion breaking and expansion prevention, and realizes the function of one agent with multiple effects.
Performance test of adding multi-effect fracturing additive in fracturing fluid system
The multi-effect fracturing additive prepared by the invention is added into base fluid of the fracturing fluid according to the proportion of 0.25-0.4% of the total mass of the fracturing fluid, and the performance of the fracturing fluid is detected according to SY/T6376 and SY/T5107, and the results are shown in Table 2. Wherein, the damage rate is the damage rate to the permeability of the rock core.
The formula of the fracturing fluid comprises:
base liquid: clear water and 0.40 percent of guanidine gum;
crosslinking liquid: 0.4% borax +0.3% ammonium persulphate;
crosslinking ratio: 100:8-12
The single agents corresponding to the respective examples were added to the base fluid of the fracturing fluid, respectively, as reference examples. The single agents are conventional auxiliary agents sold in different manufacturers and are respectively as follows:
clay stabilizer a: the main effective component is choline chloride;
clay stabilizer b: the main effective component is polymethacryloxyethyl trimethyl ammonium chloride;
and (3) bactericide: the main active ingredient is a biquaternary ammonium salt bactericide;
and (3) emulsion breaker a: the main effective component is block polyether demulsifier TA 1031;
and (3) a demulsifier b: the main effective component is a block polyether demulsifier AF 6231;
and (3) a demulsifier c: the main effective component is a block polyether demulsifier AF 3125;
the cleanup additive a mainly comprises octadecyl dihydroxyethyl amine oxide as the active ingredient;
the cleanup additive b comprises the main effective component of cocamidopropyl amine oxide;
reference 1 is: respectively adding bactericide which accounts for 0.05 percent of the total mass of the fracturing fluid, demulsifier a which accounts for 0.05 percent of the total mass of the fracturing fluid, clay stabilizer a which accounts for 0.3 percent of the total mass of the fracturing fluid and cleanup additive a which accounts for 0.3 percent of the total mass of the fracturing fluid;
reference 2 is: respectively adding bactericide which accounts for 0.05 percent of the total mass of the fracturing fluid, demulsifier b which accounts for 0.05 percent of the total mass of the fracturing fluid, clay stabilizer b which accounts for 0.3 percent of the total mass of the fracturing fluid and cleanup additive a which accounts for 0.3 percent of the total mass of the fracturing fluid;
reference 3 is: 0.05 percent of bactericide, 0.05 percent of demulsifier c, 0.3 percent of clay stabilizer a and 0.3 percent of cleanup additive b which account for the total mass of the fracturing fluid are respectively added into the base fluid of the fracturing fluid.
The amounts of the active ingredients added to the respective adjuvants in references 1, 2 and 3 were equal to the contents of the corresponding substances in examples 1, 3 and 5, respectively, and were comparable to each other.
TABLE 2 fracturing fluid test results
As can be seen from Table 2, the addition of the multi-effect fracturing additive of the invention has little influence on the viscosity of a fracturing fluid system, has good compatibility, can effectively reduce the surface interfacial tension, shows that the multi-effect fracturing additive has better drainage assistance, and has good demulsification effect and small damage rate to the core permeability. However, when the single agents are respectively added into the base fluid of the fracturing fluid, the effect is obviously inferior to the case of adding the multi-effect fracturing auxiliary agent provided by the invention.
Claims (3)
1. A multi-effect fracturing additive is composed of the following raw materials in parts by weight: 10-20 parts of clay stabilizer, 8-15 parts of amine oxide type amphoteric surfactant, 5-10 parts of synergist, 7-10 parts of wrapping agent, 45-70 parts of water,
wherein, the synergist is prepared by the following method:
weighing 25-40 parts of methanol into a reaction device, starting a stirrer, adding 25-40 parts of block polyether demulsifier into the stirrer, and reacting for 1 hour; then heating to 50 ℃, adding 20-50 parts of biquaternary ammonium salt bactericide, and reacting for 1 h;
the wrapping agent is OP-10 or OP-20;
the clay stabilizer is choline chloride or polymethacryloxyethyltrimethyl ammonium chloride;
the amine oxide type amphoteric surfactant is one of octadecyl dihydroxyethyl amine oxide, tetradecyl dihydroxyethyl amine oxide or cocamidopropyl amine oxide;
the block polyether demulsifier is one of TA1031, AF6231 or AF 3125.
2. The method for preparing the multi-effect fracturing additive of claim 1, wherein the fracturing additive comprises: the method comprises the following steps:
(1) heating water to 40 ℃, starting stirring, adding a clay stabilizer, and reacting for 1 h;
(2) adding an amine oxide type amphoteric surfactant into the product obtained in the step (1), and reacting for 1 h;
(3) adding a synergist into the product obtained in the step (2), heating to 40-60 ℃, and reacting for 2 hours;
(4) and (4) adding a wrapping agent into the product obtained in the step (3), and reacting for 30-60 min.
3. The use of the multi-effect fracturing additive of claim 1, wherein: and adding the multi-effect fracturing additive into a base fluid of the fracturing fluid, wherein the mass of the multi-effect fracturing additive accounts for 0.25-0.4% of the total mass of the fracturing fluid.
Priority Applications (1)
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| CN109915098A (en) * | 2019-03-26 | 2019-06-21 | 山西沁盛煤层气作业有限责任公司 | Compact sandstone gas fracturing yield increasing technique |
| CN111574988A (en) * | 2020-05-19 | 2020-08-25 | 陕西省石油化工研究设计院 | Guar gum clean fracturing fluid for oil well and preparation method thereof |
| CN114656946A (en) * | 2022-03-09 | 2022-06-24 | 河南天祥新材料股份有限公司 | Emulsion breaking and gel breaking agent for emulsion fracturing fluid without residues |
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