CN114426828A - Oil washing demulsifier for fracturing fluid and application thereof - Google Patents
Oil washing demulsifier for fracturing fluid and application thereof Download PDFInfo
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- CN114426828A CN114426828A CN202011024609.4A CN202011024609A CN114426828A CN 114426828 A CN114426828 A CN 114426828A CN 202011024609 A CN202011024609 A CN 202011024609A CN 114426828 A CN114426828 A CN 114426828A
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- 239000012530 fluid Substances 0.000 title claims abstract description 50
- 238000005406 washing Methods 0.000 title claims abstract description 43
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000002736 nonionic surfactant Substances 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 230000018044 dehydration Effects 0.000 claims abstract description 6
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 28
- 239000004094 surface-active agent Substances 0.000 claims description 17
- WOWHHFRSBJGXCM-UHFFFAOYSA-M cetyltrimethylammonium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCC[N+](C)(C)C WOWHHFRSBJGXCM-UHFFFAOYSA-M 0.000 claims description 13
- DDXLVDQZPFLQMZ-UHFFFAOYSA-M dodecyl(trimethyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCC[N+](C)(C)C DDXLVDQZPFLQMZ-UHFFFAOYSA-M 0.000 claims description 13
- ICLYJLBTOGPLMC-KVVVOXFISA-N (z)-octadec-9-enoate;tris(2-hydroxyethyl)azanium Chemical compound OCCN(CCO)CCO.CCCCCCCC\C=C/CCCCCCCC(O)=O ICLYJLBTOGPLMC-KVVVOXFISA-N 0.000 claims description 5
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 5
- -1 polyoxyethylene Polymers 0.000 claims description 5
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims description 5
- 229940117013 triethanolamine oleate Drugs 0.000 claims description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 4
- 125000005609 naphthenate group Chemical group 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- HNNQYHFROJDYHQ-UHFFFAOYSA-N 3-(4-ethylcyclohexyl)propanoic acid 3-(3-ethylcyclopentyl)propanoic acid Chemical compound CCC1CCC(CCC(O)=O)C1.CCC1CCC(CCC(O)=O)CC1 HNNQYHFROJDYHQ-UHFFFAOYSA-N 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 14
- 230000002195 synergetic effect Effects 0.000 abstract description 7
- 238000004945 emulsification Methods 0.000 abstract description 6
- 239000003093 cationic surfactant Substances 0.000 abstract description 4
- 150000001768 cations Chemical class 0.000 abstract description 4
- 238000009736 wetting Methods 0.000 abstract description 4
- 239000012752 auxiliary agent Substances 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 70
- 239000010779 crude oil Substances 0.000 description 17
- 239000000839 emulsion Substances 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- 239000003129 oil well Substances 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- 239000011521 glass Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000001993 wax Substances 0.000 description 3
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000001804 emulsifying effect Effects 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 125000001183 hydrocarbyl group Chemical group 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000002888 zwitterionic surfactant Substances 0.000 description 2
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 230000002528 anti-freeze Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000003899 bactericide agent Substances 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 239000008384 inner phase Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000008385 outer phase Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920000056 polyoxyethylene ether Polymers 0.000 description 1
- 229940051841 polyoxyethylene ether Drugs 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 239000002562 thickening agent Substances 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
-
- 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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
-
- 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
-
- 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
- C09K8/885—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention provides a wash oil demulsifier for fracturing fluid and application thereof. The wash oil demulsifier comprises the following raw materials in percentage by weight: an oil washing agent: 20 to 36 percent; a demulsifier: 12 to 18 percent; demulsifying quick-acting agent: 40% -45%; the balance of water, the interfacial tension of the oil washing demulsifier for the fracturing fluid at room temperature is less than or equal to 2mN/m, the dehydration rate is more than or equal to 95 percent, and the oil washing efficiency is more than or equal to 50 percent. The wash oil demulsifier of the invention is based on cation and nonionic surfactant, and is added with a certain amount of inorganic auxiliary agent for compatibility, the wash oil and demulsification capability greatly exceed the simple superposition of the three, thereby generating obvious 'synergistic' effect and having good wetting inversion, emulsification and demulsification functions.
Description
Technical Field
The invention relates to the technical field of chemical additives for oil and gas fields, in particular to a wash oil demulsifier used in oil well fracturing fluid.
Background
With the continuous development of oil and gas reservoirs, the oil and gas yield is gradually reduced, particularly, the pore throat diameters of substrates of compact reservoirs and shale strata are extremely small, usually are nano-scale, the flow resistance of crude oil is large, and the crude oil is difficult to directly extract from the substrates. Implementing hydraulic fracturing is an important stimulation measure for improving the productivity of oil and gas wells and the recovery ratio of oil reservoirs. The hydraulic fracturing is that a viscoelastic fluid (namely fracturing fluid) with certain sand carrying capacity and exceeding the energy absorbed by the stratum is injected into the stratum through an oil well and a gas well by utilizing ground high-pressure equipment, a crack with certain flow conductivity can be generated when the pressure of the stratum exceeds the fracture pressure, and after the ground pressure is removed, sand carried by the fracturing fluid supports the crack to ensure an oil flow channel and a gas flow channel, so that the aim of increasing the yield of the oil well and the gas well is fulfilled.
Generally, the fracturing fluid only needs to meet the requirements of site construction to achieve the purpose of adding sand, and the fracturing fluid is not required to have the performance of improving the crude oil recovery ratio. However, during actual construction, the fracturing fluid system (tackifier mainly takes polymer) is used for influencing, after a horizontal well is fractured in a large scale (the liquid amount of each well is 3-5 ten thousand square), the polymer system and underground crude oil are seriously emulsified, and rapid gel breaking cannot be realized in the process of flowing back to the ground surface, so that a polluted stratum or a fracture channel is blocked, the condition can cause great damage to a reservoir stratum, the purpose of increasing the yield cannot be achieved, and the productivity can be reduced.
The use of wash agents in fracturing fluids to enhance oil recovery during fracturing is also disclosed in the prior art. For example, patent CN106350048A discloses an oil washing agent for oil well fracturing, which is prepared by compounding sulfonate anionic surfactant, cationic Gemini surfactant, polyoxyethylene ether nonionic surfactant and water, and achieves a good oil washing effect by using a surfactant with low surface tension.
For example, patent CN108504346A discloses an antifreeze clean fracturing fluid, which comprises the following components in percentage by mass: 2.0-15.0% of surfactant, 1.0-20.0% of water-soluble salt, 28.0-55.0% of alcohol and 36.0-55.0% of water. The surfactant can be selected from a zwitterionic surfactant with an unsaturated docosanoic hydrocarbyl chain as a hydrophobic tail chain or a zwitterionic surfactant with an unsaturated octadecanoic hydrocarbyl chain as a hydrophobic tail chain, the freezing point of the fracturing fluid is reduced while the performance of the fracturing fluid is ensured, the low-temperature-resistant service performance is improved, and the fracturing fluid can be safely used in a working environment lower than zero.
For example, patent CN102851018A discloses a recoverable surfactant fracturing fluid, which comprises the following components in parts by weight: recoverable surfactant fracturing fluid densifier: 5-10 parts; clear water or potassium chloride solution: 100 parts. Wherein the recoverable surfactant fracturing fluid thickening agent is composed of 55-65% of C by mass21H49O3N35-15% of CH3CH2OH and 25-35% H2O, wherein C21H49O3N3Is a paste of polyhydroxy quaternary ammonium salt.
However, the emulsification problem of the fracturing fluid and the crude oil during the fracturing flow-back process is not considered in the prior art disclosed above, and the existing demulsifier is generally used for solving the demulsification during the gathering and transportation process after the crude oil is produced, and is not improved for the demulsification during the fracturing flow-back process. Therefore, it is highly desirable to develop a multifunctional activator for fracturing fluid, which can not only fully perform the functions of dialyzing, discharging oil and increasing the recovery ratio, but also solve the problem of emulsification of the fracturing fluid and crude oil.
Disclosure of Invention
Aiming at the problems, the invention provides a wash oil demulsifier for fracturing fluid and application thereof. The wash oil demulsifier is based on cation and nonionic surfactant, and is added with a certain amount of inorganic auxiliary agent for compatibility, so that the wash oil demulsification capability greatly exceeds the simple superposition of the cation, the nonionic surfactant and the nonionic surfactant, an obvious 'synergistic' effect is generated, and the wash oil demulsifier has good wetting inversion, emulsification and demulsification functions.
The invention provides the following technical scheme:
the invention provides a washing oil demulsifier for fracturing fluid, which comprises the following raw materials in percentage by weight:
an oil washing agent: 20 to 36 percent
A demulsifier: 12 to 18 percent
Demulsifying quick-acting agent: 40 to 45 percent
The balance of water;
the interfacial tension of the wash oil demulsifier at room temperature is less than or equal to 2mN/m, the dehydration rate is more than or equal to 95%, and the wash oil efficiency is more than or equal to 50%.
Specifically, the oil washing agent is one or a combination of a quaternary ammonium salt surfactant and a nonionic surfactant.
Specifically, the quaternary ammonium salt surfactant is one or a combination of hexadecyl trimethyl ammonium chloride and dodecyl trimethyl ammonium chloride.
Specifically, the nonionic surfactant is one or a combination of triethanolamine oleate and polyoxyethylene naphthenate.
Specifically, based on the total mass of the oil washing demulsifier for fracturing fluid, the oil washing agent comprises the following components in percentage by weight:
hexadecyltrimethylammonium chloride: 12 to 20 percent of the total weight of the mixture,
dodecyl trimethyl ammonium chloride: 5 to 8 percent.
Triethanolamine oleate: 1 to 3 percent
Polyoxyethylene naphthenic acid ether: 2 to 5 percent.
Wherein, the hexadecyl trimethyl ammonium chloride and the dodecyl trimethyl ammonium chloride are cation and nonionic surfactants such as triethanolamine oleate, polyoxyethylene naphthenate and the like, can greatly reduce the interfacial tension of the solution, and have the effects of wetting inversion, emulsification, oil washing and the like. The cationic surfactant is easy to adsorb on the rock so as to change the wettability of the rock surface, the rock is changed from oleophylic to hydrophilic, and residual oil originally existing in a film state adsorbed on the oleophylic rock surface is easier to separate to form flowable oil drops which are displaced by active water; the surfactant has the function of reducing the interfacial tension, so that the crude oil can be dispersed in the active water to form O/W type emulsion, and the surfactant has the stabilizing function, so that oil drops are not easy to stick back to the surface of the stratum; the oil washing efficiency is improved under multiple actions of wetting inversion, reducing interfacial tension, emulsifying dispersion and the like, and the surfactant with very low concentration has obvious oil washing effect; but also has a certain sterilization effect and has a synergistic effect with the bactericide in the fracturing fluid.
When the oil well is subjected to hydraulic fracturing, the hydraulic 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 demulsifier (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.
Specifically, the demulsifier is AE 1910. The demulsifier AE1910 added in the invention is block polyether taking amine as initiator, and is a multi-branch nonionic surfactant. At different temperatures, different chain segments in AE1910 molecules are adsorbed on an oil-water interface, so that the interfacial tension and interfacial film strength of emulsified water drops can be reduced, the formed W/O type emulsion becomes unstable, and the interfacial film is easy to crack under the action of external force, so that water in the inner phase of emulsion particles breaks through the interfacial film and enters the outer phase, and the oil and the water are separated. AE1910 has high demulsification speed and also has synergistic effects of reducing interfacial tension, reducing viscosity, preventing wax, reducing coagulation and the like. Tests prove that AE1910 can reduce the interfacial tension to enable oil drops to be easy to deform, and the resistance is reduced when the oil drops pass through a pore throat, so that residual oil in a highly dispersed state in hydrophilic rock can be displaced to form flowing oil, and a synergistic oil washing effect is achieved; due to the multi-branch structure of the molecules, tiny networks are easily formed, so that paraffin single crystals formed in the crude oil can not move freely in the networks and are prevented from being connected with one another to form a paraffin net structure, the viscosity and the freezing point of the crude oil are reduced, the flowability of the crude oil is increased, and the recovery ratio of the fractured crude oil is greatly improved together with the oil washing agent.
Specifically, the demulsification quick-acting agent is ethanol. The ethanol is used as a quick-acting demulsifying agent and has a polycondensation effect on polymers in a fracturing fluid-crude oil emulsifying system, so that the stability of an emulsion is destroyed, and demulsification is accelerated. The ethanol is also a supplementary solvent of the surfactant, and the polarity of an oil phase and a water phase is adjusted, so that the lipophilicity and the hydrophilicity of the surfactant are fully balanced, the AE1910 demulsifier is favorably dispersed and dissolved, is more easily and uniformly dispersed into crude oil, and the demulsification speed is accelerated; the ethanol enables the oil washing agent to be adsorbed on an oil-water interface to the maximum extent to form a micellar solution, and a lower interfacial tension is generated between the micellar solution and oil, so that the oil washing efficiency of the oil washing agent is qualitatively leaped.
Specifically, the washing oil demulsifier for the fracturing fluid is obtained according to the following preparation method: and adding the oil washing agent, the demulsifier, the demulsification quick-acting agent and the water which are measured according to the mass percentage in sequence, and uniformly stirring to obtain the oil washing demulsifier for the fracturing fluid.
The invention also provides application of the oil-washing demulsifier for the fracturing fluid in chemical additives of oil and gas fields.
The embodiment of the invention has the following technical effects:
the prepared wash oil demulsifier for the fracturing fluid has good compatibility among all components, can generate synergistic effect, has better effects than single-agent use, has good drainage assisting, demulsifying and wax preventing functions, 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 the stratum; and the preparation method of the wash oil demulsifier for the fracturing fluid is simple, and the wash oil demulsifier is added into the fracturing fluid on site and is simple to operate.
Examples
The present invention is described in detail below with reference to examples:
example 1
The wash oil demulsifier sample 1 was composed of the following raw materials in weight percent:
an oil washing agent: hexadecyl trimethyl ammonium chloride, 12%
Dodecyl trimethyl ammonium chloride, 8%
A demulsifier: AE1910, 12%
Demulsifying quick-acting agent: ethanol, 40%
Water: 28 percent of
The preparation method of the wash oil demulsifier sample 1 is as follows:
in a 250ml glass reactor, 12% hexadecyl trimethyl ammonium chloride, 8% dodecyl trimethyl ammonium chloride, 12% AE1910, 40% ethanol and 28% clear water are added in sequence, and the mixture is stirred uniformly to obtain the oil-washing demulsifier No. 1.
Example 2
The wash oil demulsifier sample 2 was composed of the following raw materials in weight percent:
an oil washing agent: hexadecyl trimethyl ammonium chloride, 15%
Dodecyl trimethyl ammonium chloride, 5%
A demulsifier: AE1910, 15%
Demulsifying quick-acting agent: ethanol, 42%
Water: 23 percent of
The preparation method of the wash oil demulsifier sample 2 is as follows:
15% of hexadecyl trimethyl ammonium chloride, 5% of dodecyl trimethyl ammonium chloride, 15% of AE1910, 42% of ethanol and 23% of clear water are sequentially added into a 250ml glass reactor and uniformly stirred to obtain the oil-washing demulsifier No. 2.
Example 3
The wash oil demulsifier sample 3 was composed of the following raw materials in weight percent:
an oil washing agent: cetyl trimethyl ammonium chloride, 18%
Dodecyl trimethyl ammonium chloride, 5%
A demulsifier: AE1910, 15%
Demulsifying quick-acting agent: ethanol, 40%
Water: 22 percent
The preparation method of the wash oil demulsifier sample 3 is as follows:
in a 250ml glass reactor, 18% hexadecyl trimethyl ammonium chloride, 5% dodecyl trimethyl ammonium chloride, 15% AE1910, 40% ethanol and 22% water are added in sequence, and the mixture is stirred uniformly to obtain the number 3 oil-washing demulsifier.
Example 4
The wash oil demulsifier sample 4 was composed of the following raw materials in weight percent:
an oil washing agent: cetyl trimethyl ammonium chloride, 20%
Dodecyl trimethyl ammonium chloride, 8%
A demulsifier: AE1910, 18%
Demulsifying quick-acting agent: ethanol, 45%
Water: 9 percent of
The preparation method of the wash oil demulsifier sample 4 was as follows:
20% of hexadecyl trimethyl ammonium chloride, 8% of dodecyl trimethyl ammonium chloride, 18% of AE1910, 45% of ethanol and 9% of water are sequentially added into a 250ml glass reactor and uniformly stirred to obtain the oil-washing demulsifier No. 4.
The oil-washing demulsifier samples 1 to 4 prepared in examples 1 to 4 were prepared into 0.5% aqueous solutions (the oil-washing demulsifier was regarded as a pure sample), the interfacial tension thereof was measured at room temperature (25 ℃) by the full-automatic spinning drop interfacial tension of TX500C, the dehydration rate was measured according to the technical requirements for crude oil demulsifiers of Q/SHCG66-2013, and the oil-washing efficiency was measured according to the technical requirements for surfactants for oil displacement of Q/SHCG 79-2014. The test results are shown in table 1.
TABLE 1 test results of different test samples
| Test sample | Interfacial tension, mN/m | A rate of dehydration% | Oil washing efficiency% |
| Wash oil demulsifier sample 1 | 1.82 | 95.7 | 55.1 |
| Wash oil demulsifier sample 2 | 1.46 | 97.8 | 68.8 |
| Wash oil demulsifier sample 3 | 0.85 | 96.5 | 72.2 |
| Wash oil demulsifier sample 4 | 0.58 | 99.0 | 77.4 |
As can be seen from the table 1, the interfacial tension of the wash oil demulsifier at room temperature is less than or equal to 2mN/m, the dehydration rate determined according to Q/SHCG66-2013 is more than or equal to 95%, and the wash oil efficiency determined according to Q/SHCG 79-2014 is more than or equal to 50%. Because the compatibility of each component is good, the synergistic effect can be generated, the effect is better than that of single agent use, and the functions of drainage assistance, emulsion breaking and wax prevention are good, thereby realizing the purpose of multiple effects of one agent.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, but any modifications or equivalent variations made according to the technical spirit of the present invention are within the scope of the present invention as claimed.
Claims (8)
1. The oil washing demulsifier for the fracturing fluid is characterized by comprising the following raw materials in percentage by weight:
an oil washing agent: 20 to 36 percent
A demulsifier: 12 to 18 percent
Demulsifying quick-acting agent: 40 to 45 percent
The balance of water;
the interfacial tension of the wash oil demulsifier for the fracturing fluid at room temperature is less than or equal to 2mN/m, the dehydration rate is more than or equal to 95 percent, and the wash oil efficiency is more than or equal to 50 percent.
2. The wash oil demulsifier for fracturing fluid of claim 1, wherein the wash oil agent is one or a combination of quaternary ammonium salt surfactant and nonionic surfactant.
3. The oil washing demulsifier for fracturing fluid of claim 2, wherein the quaternary ammonium salt surfactant is one or a combination of hexadecyl trimethyl ammonium chloride and dodecyl trimethyl ammonium chloride.
4. The oil washing demulsifier for fracturing fluid of claim 2, wherein the nonionic surfactant is one or a combination of triethanolamine oleate and polyoxyethylene naphthenate.
5. The oil washing demulsifier for fracturing fluid of claim 2, wherein the oil washing agent consists of the following components in percentage by weight based on the total mass of the oil washing demulsifier for fracturing fluid:
hexadecyltrimethylammonium chloride: 12 to 20 percent
Dodecyl trimethyl ammonium chloride: 5 to 8 percent of
Triethanolamine oleate: 1 to 3 percent
Polyoxyethylene naphthenic acid ether: 2 to 5 percent.
6. The wash oil demulsifier for fracturing fluid of claim 1, wherein the demulsifier is AE 1910.
7. The wash oil demulsifier for fracturing fluid of claim 1, wherein the quick-acting demulsifying agent is ethanol.
8. Use of the wash oil demulsifier for fracturing fluid of any one of claims 1 to 7 for chemical assistants in oil and gas fields.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011024609.4A CN114426828A (en) | 2020-09-25 | 2020-09-25 | Oil washing demulsifier for fracturing fluid and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011024609.4A CN114426828A (en) | 2020-09-25 | 2020-09-25 | Oil washing demulsifier for fracturing fluid and application thereof |
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| CN (1) | CN114426828A (en) |
Cited By (2)
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| CN115386392A (en) * | 2022-11-01 | 2022-11-25 | 胜利油田凯渡石油技术开发有限公司 | Thick oil demulsifier and preparation method thereof |
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