CN116622357A - Salt-tolerant thickened oil viscosity reducing composition, viscosity reducer and application thereof - Google Patents
Salt-tolerant thickened oil viscosity reducing composition, viscosity reducer and application thereof Download PDFInfo
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- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 96
- 239000000203 mixture Substances 0.000 title claims abstract description 70
- 230000001603 reducing effect Effects 0.000 title claims abstract description 34
- 239000003381 stabilizer Substances 0.000 claims abstract description 51
- 239000003945 anionic surfactant Substances 0.000 claims abstract description 45
- 239000002736 nonionic surfactant Substances 0.000 claims abstract description 44
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims abstract description 35
- 238000011161 development Methods 0.000 claims abstract description 14
- 150000002500 ions Chemical class 0.000 claims abstract description 11
- 239000003921 oil Substances 0.000 claims description 137
- 239000004094 surface-active agent Substances 0.000 claims description 49
- YWYZEGXAUVWDED-UHFFFAOYSA-N triammonium citrate Chemical compound [NH4+].[NH4+].[NH4+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O YWYZEGXAUVWDED-UHFFFAOYSA-N 0.000 claims description 39
- 239000003513 alkali Substances 0.000 claims description 29
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 claims description 19
- 229920001732 Lignosulfonate Polymers 0.000 claims description 15
- 239000000295 fuel oil Substances 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 150000002191 fatty alcohols Chemical class 0.000 claims description 9
- 239000003208 petroleum Substances 0.000 claims description 7
- SRSXLGNVWSONIS-UHFFFAOYSA-M benzenesulfonate Chemical compound [O-]S(=O)(=O)C1=CC=CC=C1 SRSXLGNVWSONIS-UHFFFAOYSA-M 0.000 claims description 4
- 229940077388 benzenesulfonate Drugs 0.000 claims description 4
- 230000033558 biomineral tissue development Effects 0.000 abstract description 33
- 230000000694 effects Effects 0.000 abstract description 18
- 150000003839 salts Chemical class 0.000 abstract description 14
- 230000018109 developmental process Effects 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 8
- 238000002360 preparation method Methods 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract 1
- 239000008398 formation water Substances 0.000 description 60
- 101100448223 Caenorhabditis elegans gcy-1 gene Proteins 0.000 description 35
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical group [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 26
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 26
- 239000011575 calcium Substances 0.000 description 24
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 23
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 23
- 229910001424 calcium ion Inorganic materials 0.000 description 23
- 229910001425 magnesium ion Inorganic materials 0.000 description 23
- 239000010779 crude oil Substances 0.000 description 22
- 230000009467 reduction Effects 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 16
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 14
- 239000011734 sodium Substances 0.000 description 14
- 229910052708 sodium Inorganic materials 0.000 description 14
- 229940051841 polyoxyethylene ether Drugs 0.000 description 12
- 229920000056 polyoxyethylene ether Polymers 0.000 description 12
- YDEXUEFDPVHGHE-GGMCWBHBSA-L disodium;(2r)-3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Na+].[Na+].COC1=CC=CC(C[C@H](CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O YDEXUEFDPVHGHE-GGMCWBHBSA-L 0.000 description 11
- 230000001804 emulsifying effect Effects 0.000 description 11
- 230000009286 beneficial effect Effects 0.000 description 9
- 238000004945 emulsification Methods 0.000 description 9
- 238000002474 experimental method Methods 0.000 description 8
- 239000000839 emulsion Substances 0.000 description 6
- 238000012216 screening Methods 0.000 description 6
- 230000006872 improvement Effects 0.000 description 5
- -1 polyoxyethylene nonylphenol Polymers 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000012795 verification Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910021645 metal ion Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 125000005233 alkylalcohol group Chemical group 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 125000000373 fatty alcohol group Chemical group 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 235000010413 sodium alginate Nutrition 0.000 description 2
- 239000000661 sodium alginate Substances 0.000 description 2
- 229940005550 sodium alginate Drugs 0.000 description 2
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 2
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 2
- 229920005552 sodium lignosulfonate Polymers 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- 238000013112 stability test Methods 0.000 description 2
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 2
- RNMDNPCBIKJCQP-UHFFFAOYSA-N 5-nonyl-7-oxabicyclo[4.1.0]hepta-1,3,5-trien-2-ol Chemical compound C(CCCCCCCC)C1=C2C(=C(C=C1)O)O2 RNMDNPCBIKJCQP-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- ULUAUXLGCMPNKK-UHFFFAOYSA-N Sulfobutanedioic acid Chemical compound OC(=O)CC(C(O)=O)S(O)(=O)=O ULUAUXLGCMPNKK-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 150000008051 alkyl sulfates Chemical class 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 150000003857 carboxamides Chemical class 0.000 description 1
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920002503 polyoxyethylene-polyoxypropylene Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- SLBXZQMMERXQAL-UHFFFAOYSA-M sodium;1-dodecoxy-4-hydroxy-1,4-dioxobutane-2-sulfonate Chemical compound [Na+].CCCCCCCCCCCCOC(=O)C(S(O)(=O)=O)CC([O-])=O SLBXZQMMERXQAL-UHFFFAOYSA-M 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 230000002195 synergetic effect Effects 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
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Geochemistry & Mineralogy (AREA)
- Lubricants (AREA)
Abstract
The invention relates to a salt-tolerant thick oil viscosity reducing composition, a viscosity reducer and application thereof, wherein the viscosity reducing composition comprises a nonionic surfactant, a sulfonate type anionic surfactant and an ionic stabilizer; the nonionic surfactant: sulfonate-type anionic surfactant: the mass ratio of the ion stabilizer is 0.5-1.5:0.5-1.5:0.2-1. The salt-resistant thickened oil viscosity reducing composition provided by the invention has the advantages of simple components, easily obtained raw materials and low price. The emulsified viscosity-reducing agent prepared by the method has low base number, pH value of about 8.5 and mineralization resistance of 10 multiplied by 10 4 mg/L, the temperature resistance reaches 300 ℃, the preparation is simple, the field application effect is good, and a new technical idea is provided for the development of high-salinity thick oil.
Description
Technical Field
The invention relates to a salt-tolerant thickened oil viscosity reducing composition, a viscosity reducer and application thereof, and belongs to the technical field of thickened oil reservoir development.
Background
With the rapid development of economy, the demand of the market for petroleum is increasing, and the exploitation of conventional crude oil cannot meet the demand of people for resources, so that the exploitation of thick oil is becoming more and more important, and the exploitation of thick oil is becoming a hot research direction of petroleum exploitation at present.
The thick oil is rich in colloid and asphaltene, has high viscosity, high density and poor fluidity, and brings great difficulty to exploitation and transportation. The method reduces the viscosity of the thick oil, improves the fluidity of the thick oil, and is a key for solving the problems of thick oil exploitation, gathering and refining. The addition of an emulsifying viscosity reducer in the development of thick oil is a common technical method, and the emulsifying viscosity reducer mainly enables the thick oil to form O/W type emulsion or converts W/O type emulsion into O/W type emulsion under the action of the emulsifier, so that the viscosity of crude oil is greatly reduced. Due to the increase of the exploitation depth of the thick oil and the complexity of geological conditions, the requirements of high temperature resistance and mineral salt resistance are put forward on the emulsifying viscosity reducer. Petroleum sulfonate, while inexpensive and used successfully in some oil fields, is a poor mineral salt resistance because it is an anionic emulsifying viscosity reducer. The nonionic viscosity reducer has the advantages of high salt resistance, low foamability, easiness in forming low-viscosity emulsion and the like, but is limited in practical application due to high price.
Chinese patent No. 201110446042.4 discloses a salt-resistant and temperature-resistant thick oil emulsifying viscosity reducer, which consists of sulfonate type anionic surfactant, sodium monolauryl sulfosuccinate, sodium polyoxyethylene nonylphenol ether sulfosuccinate, polyoxyethylene ether ester salt, polyoxyethylene nonylphenol polyoxypropylene alcohol ether segmented copolymer, carboxymethyl polyoxyethylene ether, organic amide polyoxyethylene ether, polyoxyethylene polyoxypropylene polyethylene polyamine, sulfonate type polyacrylamide, nonionic fluorocarbon surfactant, modified nano auxiliary agent, alkaline auxiliary agent and water. This antigenSalt resistance of the salt temperature-resistant thick oil emulsifying viscosity reducer reaches 24 multiplied by 10 4 mg/L, can realize the emulsification and viscosity reduction of thick oil with the viscosity of 500Pa.s at 50 ℃, but has the temperature resistance of only 150 ℃, complex composition components and high price.
Disclosure of Invention
The invention aims to provide a salt-tolerant thick oil viscosity reducing composition, which solves the problems of complex composition, high price and poor temperature resistance of thick oil viscosity reducer in the prior art.
The invention provides a salt-tolerant thick oil viscosity reducer, which aims to solve the problems of complex composition, high price and poor temperature resistance of the thick oil viscosity reducer in the prior art.
The third purpose of the invention is to provide the application of the salt-tolerant thick oil viscosity reducing composition or the salt-tolerant thick oil viscosity reducer in the development of the high-mineralization thick oil reservoir, wherein the salt-tolerant thick oil viscosity reducer comprises the common chemical products, has the advantages of small addition amount, wide sources, low price, pH value of about 8.5 and mineralization tolerance of 10 multiplied by 10 4 mg/L, the temperature resistance reaches 300 ℃, the emulsifying effect on high-viscosity heavy oil is good, and the method is widely applied to development of high-mineralization heavy oil reservoirs.
In order to achieve the purpose, the technical scheme of the salt-tolerant thickened oil viscosity-reducing composition provided by the invention is as follows:
a salt-tolerant thickened oil viscosity-reducing composition comprises a nonionic surfactant, a sulfonate type anionic surfactant and an ionic stabilizer; the nonionic surfactant: sulfonate-type anionic surfactant: the mass ratio of the ion stabilizer is 0.5-1.5:0.5-1.5:0.2-1.
The beneficial effects of the technical scheme are that: the salt-resistant thick oil viscosity-reducing composition disclosed by the invention is simple in components, is a common chemical product, is small in addition amount, wide in source and low in price, and the viscosity reducer prepared from the viscosity reducer is good in emulsifying effect on high-viscosity thick oil and is widely applied to development of high-mineralization thick oil reservoirs.
As a further improvement, the ionic stabilizer is one or two of ammonium citrate and EDTA-2Na.
The beneficial effects of the technical scheme are that: the ion stabilizer has strong chelating force and dispersing force, does not interact with other components in the system, and can effectively shield Ca in the process that the viscosity reducer enters into the stratum to carry out emulsification and viscosity reduction with crude oil 2+ 、Mg 2+ The metal ions prevent the phenomena of turbidity, precipitation, reduction of viscosity reducing capability and the like in the mixing process of the viscosity reducer and the hypersalinity stratum water; meanwhile, the alkali resistance is strong, the high-efficiency chelating performance is still maintained in a wide pH value range, the product performance is stable, and the environment is not polluted.
As a further improvement, the nonionic surfactant is any one of alkylphenol ethoxylates, fatty alcohol ethoxylates, and gemini surfactants.
The beneficial effects of the technical scheme are that: the surface activity of the sulfonate type anionic surfactant and nonionic surfactant compound system with the high temperature resistance characteristic is higher than that of a single component, so that the high temperature resistance requirement can be met, and the mineral salt resistance requirement can be met.
As a further improvement, the sulfonate type anionic surfactant is alkali lignin sulfonate or petroleum benzene sulfonate.
The beneficial effects of the technical scheme are that: the product is a common chemical product, contains more active functional groups, has good compatibility with thick oil, and has wide sources and low cost.
In order to achieve the purpose, the technical scheme of the salt-tolerant thickened oil viscosity reducer is as follows:
the salt-tolerant thick oil viscosity reducer comprises the salt-tolerant thick oil viscosity reducing composition and water.
The beneficial effects of the technical scheme are that: the invention provides a salt-resistant thickened oil viscosity reducer, which consists of a nonionic surfactant, a sulfonate type anionic surfactant, an ionic stabilizer and water, wherein the nonionic surfactant, the sulfonate type anionic surfactant and the ionic stabilizer are compounded for use, and the components are synergistic, so that the salt-resistant thickened oil viscosity reducer has a good emulsifying effect on high-viscosity thickened oil, has a very remarkable viscosity reducing effect on thickened oil, and has mineralization resistance reaching the aim of10×10 4 mg/L, the temperature resistance reaches 300 ℃.
As a further improvement, the mass percentage of the ionic stabilizer in the viscosity reducer is 0.2-1.0%.
The beneficial effects of the technical scheme are that: the product can be used together with other two surfactants by using less ionic stabilizer, thereby having good viscosity reduction effect and being beneficial to reducing production cost.
In order to achieve the above purpose, the technical scheme of the application of the salt-tolerant thick oil viscosity-reducing composition or the salt-tolerant thick oil viscosity reducer in the development of the high-mineralization thick oil reservoir is as follows:
the application of the salt-tolerant thick oil viscosity reducing composition or the salt-tolerant thick oil viscosity reducer in the development of a high-salinity thick oil reservoir.
The beneficial effects of the technical scheme are that: proved by verification, the pH value of the salt-resistant thickened oil viscosity reducer is about 8.5, and the mineralization resistance reaches 10 multiplied by 10 4 mg/L, the temperature resistance reaches 300 ℃. The viscosity reducer has simple components, easy preparation and good field application effect. The method is popularized and applied in the spring light thick oil region of Henan oilfield division of China petrochemical industry, namely 159 times are accumulated, 27744 tons of oil is accumulated, the oil-gas ratio of a measure well reaches 0.41, the salt-resistant thick oil viscosity reducer is applied to remarkably improve the development effect of extra super thick oil of the spring light oilfield, and technical support is provided for normal exploitation of the spring light hypersalinity sensitive extra super thick oil.
As a further improvement, the mass ratio of the thick oil to the salt-tolerant thick oil viscosity reducer is 7 (3-4).
The beneficial effects of the technical scheme are that: the mass ratio is used for treatment, so that the viscosity reducing effect is good, the consumption of the viscosity reducer is reduced, and the production cost is reduced.
Drawings
FIG. 1 is a thermal stability test of the salt-tolerant thickened oil viscosity reducer in experimental example 6 of the invention.
Detailed Description
The present invention will be further described with reference to the following specific embodiments, and it should be noted that, on the premise of no conflict, new embodiments may be formed by any combination of the embodiments or technical features described below. The equipment and materials used, etc., are commercially available or are conventional in the art. The methods in the following examples are conventional in the art unless otherwise specified.
In the following examples, nonionic gemini surfactant, available from Zhengzhou Jieling technology Co., ltd., model GCY-1; alkylphenol ethoxylates, available from Nantong Queenship chemical Co., ltd, model OP-10; the fatty alcohol polyoxyethylene ether is purchased from Lvsen chemical industry Co., ltd in the Yi city, and the model is AEO; the alkali lignin sulfonate is alkali lignin sodium sulfonate, and is purchased from Xinhexian county nanometer surfactant factory in Hebei province, and the model is LDP-2; the petroleum benzene sulfonate is sodium dodecyl benzene sulfonate, and is purchased from Jiangsu qingting detergent Co., ltd.
1. The specific examples of the salt-tolerant thickened oil viscosity-reducing composition provided by the invention are as follows:
example 1
The salt-tolerant thickened oil viscosity-reducing composition of the embodiment consists of a nonionic surfactant, a sulfonate type anionic surfactant and an ionic stabilizer. The nonionic surfactant is nonionic Gimmy surfactant GCY-1, the sulfonate type anionic surfactant is alkali sodium lignosulfonate LDP-2, and the ionic stabilizer is ammonium citrate. The nonionic gemini surfactant GCY-1: sodium alkali lignin sulfonate LDP-2: the mass ratio of the ammonium citrate is 1:1:0.2.
example 2
The salt-tolerant thickened oil viscosity-reducing composition of the embodiment consists of a nonionic surfactant, a sulfonate type anionic surfactant and an ionic stabilizer. The nonionic surfactant is fatty alcohol polyoxyethylene ether AEO, the sulfonate type anionic surfactant is alkali lignin sodium sulfonate LDP-2, and the ionic stabilizer is EDTA-2Na. The fatty alcohol polyoxyethylene ether AEO: sodium alkali lignin sulfonate LDP-2: the mass ratio of EDTA-2Na is 1:1.5:0.2.
example 3
The salt-tolerant thickened oil viscosity-reducing composition of the embodiment consists of a nonionic surfactant, a sulfonate type anionic surfactant and an ionic stabilizer. The nonionic surfactant is nonionic Gimmy surfactant GCY-1, the sulfonate type anionic surfactant is sodium dodecyl benzene sulfonate ABS, and the ionic stabilizer is EDTA-2Na and ammonium citrate. The nonionic gemini surfactant GCY-1: sodium dodecyl benzene sulfonate ABS: EDTA-2Na: the mass ratio of the ammonium citrate is 1:1:0.1:0.1.
example 4
The salt-tolerant thickened oil viscosity-reducing composition of the embodiment consists of a nonionic surfactant, a sulfonate type anionic surfactant and an ionic stabilizer. The nonionic surfactant is nonionic Gimmy surfactant GCY-1, the sulfonate type anionic surfactant is alkali lignin sodium sulfonate LDP-2, and the ionic stabilizer is EDTA-2Na. The nonionic gemini surfactant GCY-1: sodium alkali lignin sulfonate LDP-2: the mass ratio of EDTA-2Na is 1.5:0.5:1.0.
example 5
The salt-tolerant thickened oil viscosity-reducing composition of the embodiment consists of a nonionic surfactant, a sulfonate type anionic surfactant and an ionic stabilizer. The nonionic surfactant is nonionic Gimmy surfactant GCY-1, the sulfonate type anionic surfactant is alkali sodium lignosulfonate LDP-2, and the ionic stabilizer is ammonium citrate. The nonionic gemini surfactant GCY-1: sodium alkali lignin sulfonate LDP-2: the mass ratio of EDTA-2Na is 0.5:0.5:0.5.
example 6
The salt-tolerant thickened oil viscosity-reducing composition of the embodiment consists of a nonionic surfactant, a sulfonate type anionic surfactant and an ionic stabilizer. The nonionic surfactant is alkylphenol ethoxylate Op-10, the sulfonate type anionic surfactant is alkali lignin sodium sulfonate LDP-2, and the ionic stabilizer is ammonium citrate. The alkylphenol ethoxylates Op-10: sodium alkali lignin sulfonate LDP-2: the mass ratio of the ammonium citrate is 1:1:0.2.
example 7
The salt-tolerant thickened oil viscosity-reducing composition of the embodiment consists of a nonionic surfactant, a sulfonate type anionic surfactant and an ionic stabilizer. The nonionic surfactant is fatty alcohol polyoxyethylene ether AEO, the sulfonate type anionic surfactant is alkali lignin sodium sulfonate LDP-2, and the ionic stabilizer is ammonium citrate. The fatty alcohol polyoxyethylene ether AEO: sodium alkali lignin sulfonate LDP-2: the mass ratio of the ammonium citrate is 1:1:0.2.
example 8
The salt-tolerant thickened oil viscosity-reducing composition of the embodiment consists of a nonionic surfactant, a sulfonate type anionic surfactant and an ionic stabilizer. The nonionic surfactant is nonionic Gimmy surfactant GCY-1, the sulfonate type anionic surfactant is sodium dodecyl benzene sulfonate ABS, and the ionic stabilizer is ammonium citrate. The nonionic gemini surfactant GCY-1: sodium dodecyl benzene sulfonate ABS: the mass ratio of the ammonium citrate is 1:1:0.2.
example 9
The salt-tolerant thickened oil viscosity-reducing composition of the embodiment consists of a nonionic surfactant, a sulfonate type anionic surfactant and an ionic stabilizer. The nonionic surfactant is nonionic Gimmy surfactant GCY-1, the sulfonate type anionic surfactant is sodium dodecyl benzene sulfonate ABS, and the ionic stabilizer is EDTA-2Na. The nonionic gemini surfactant GCY-1: sodium dodecyl benzene sulfonate ABS: the mass ratio of EDTA-2Na is 1:1:1.
example 10
The salt-tolerant thickened oil viscosity-reducing composition of the embodiment consists of a nonionic surfactant, a sulfonate type anionic surfactant and an ionic stabilizer. The nonionic surfactant is nonionic Gimmy surfactant GCY-1, the sulfonate type anionic surfactant is sodium dodecyl benzene sulfonate ABS, and the ionic stabilizer is ammonium citrate. The nonionic gemini surfactant GCY-1: sodium dodecyl benzene sulfonate ABS: the mass ratio of the ammonium citrate is 1:1:1.
example 11
The salt-tolerant thickened oil viscosity-reducing composition of the embodiment consists of a nonionic surfactant, a sulfonate type anionic surfactant and an ionic stabilizer. The nonionic surfactant is nonionic Gimmy surfactant GCY-1, the sulfonate type anionic surfactant is sodium dodecyl benzene sulfonate ABS, and the ionic stabilizer is ammonium citrate. The nonionic gemini surfactant GCY-1: sodium dodecyl benzene sulfonate ABS: the mass ratio of the ammonium citrate is 1:1:0.2.
example 12
The salt-tolerant thickened oil viscosity-reducing composition of the embodiment consists of a nonionic surfactant, a sulfonate type anionic surfactant and an ionic stabilizer. The nonionic surfactant is nonionic Gimmy surfactant GCY-1, the sulfonate type anionic surfactant is sodium dodecyl benzene sulfonate ABS, and the ionic stabilizer is ammonium citrate. The nonionic gemini surfactant GCY-1: sodium dodecyl benzene sulfonate ABS: the mass ratio of the ammonium citrate is 1:1:0.3.
2. the specific examples of the salt-tolerant thickened oil viscosity reducer are as follows:
example 13
The salt-tolerant thick oil viscosity reducer of the embodiment consists of the salt-tolerant thick oil viscosity reducing composition of the embodiment 1 and simulated formation water, wherein the mineralization degree of the simulated formation water is 10 multiplied by 10 4 mg/L, calcium and magnesium ion content is 2000mg/L. Specifically, the composition comprises the following components in percentage by mass: the alkali lignin sodium sulfonate LDP-2:1.0%, nonionic gemini surfactant GCY-1:1.0%, ammonium citrate: 0.2% and the balance of simulated formation water.
Example 14
The salt-tolerant thick oil viscosity reducer of the embodiment consists of the salt-tolerant thick oil viscosity reducing composition of the embodiment 2 and simulated formation water, wherein the mineralization degree of the simulated formation water is 8 multiplied by 10 4 mg/L, calcium and magnesium ion content is 1800mg/L. Specifically, the composition comprises the following components in percentage by mass: the alkali lignin sodium sulfonate LDP-2:1.5% of fatty alcohol polyoxyethylene ether AEO:1.0%, EDTA-2Na:0.2% and the balance of simulated formation water.
Example 15
This embodimentThe salt-tolerant thick oil viscosity reducer consists of the salt-tolerant thick oil viscosity reducing composition of the embodiment 3 and simulated formation water, wherein the mineralization degree of the simulated formation water is 8 multiplied by 10 4 mg/L, calcium and magnesium ion content is 1800mg/L. Specifically, the composition comprises the following components in percentage by mass: the sodium dodecyl benzene sulfonate ABS:1.0%, nonionic gemini surfactant GCY-1:1.0%, ammonium citrate: 0.1%, EDTA-2Na:0.1% and the balance of simulated formation water.
Example 16
The salt-tolerant thick oil viscosity reducer of the embodiment consists of the salt-tolerant thick oil viscosity reducing composition of the embodiment 4 and simulated formation water, wherein the mineralization degree of the simulated formation water is 10 multiplied by 10 4 mg/L, calcium and magnesium ion content is 2000mg/L. Specifically, the composition comprises the following components in percentage by mass: the nonionic gemini surfactant GCY-1:1.5% of alkali lignin sodium sulfonate LDP-2:0.5% EDTA-2Na:1.0% and the balance of simulated formation water.
Example 17
The salt-tolerant thick oil viscosity reducer of the embodiment consists of the salt-tolerant thick oil viscosity reducing composition of the embodiment 5 and simulated formation water, wherein the mineralization degree of the simulated formation water is 8 multiplied by 10 4 mg/L, calcium and magnesium ion content is 1800mg/L. Specifically, the composition comprises the following components in percentage by mass: the nonionic gemini surfactant GCY-1:0.5% of alkali lignin sodium sulfonate LDP-2:0.5% EDTA-2Na:0.5% and the balance of simulated formation water.
Example 18
The salt-tolerant thick oil viscosity reducer of the embodiment consists of the salt-tolerant thick oil viscosity reducing composition of the embodiment 6 and simulated formation water, wherein the mineralization degree of the simulated formation water is 10 multiplied by 10 4 mg/L, calcium and magnesium ion content is 2000mg/L. Specifically, the composition comprises the following components in percentage by mass: the alkylphenol ethoxylates Op-10:1.0% of alkali lignin sodium sulfonate LDP-2:1.0%, ammonium citrate: 0.2% and the balance of simulated formation water.
Example 19
The salt-tolerant thick oil viscosity reducer of the embodiment consists of the salt-tolerant thick oil viscosity reducing composition of the embodiment 7 and simulated formation water, wherein the mineralization degree of the simulated formation water is 10 multiplied by 10 4 mg/L, calcium and magnesium ion content2000mg/L. Specifically, the composition comprises the following components in percentage by mass: the fatty alcohol polyoxyethylene ether AEO:1.0% of alkali lignin sodium sulfonate LDP-2:1.0%, ammonium citrate: 0.2% and the balance of simulated formation water.
Example 20
The salt-tolerant thick oil viscosity reducer of the embodiment consists of the salt-tolerant thick oil viscosity reducing composition of the embodiment 8 and simulated formation water, wherein the mineralization degree of the simulated formation water is 10 multiplied by 10 4 mg/L, calcium and magnesium ion content is 2000mg/L. Specifically, the composition comprises the following components in percentage by mass: the nonionic gemini surfactant GCY-1:1.0% sodium dodecylbenzenesulfonate ABS:1.0%, ammonium citrate: 0.2% and the balance of simulated formation water.
Example 21
The salt-tolerant thick oil viscosity reducer of the embodiment consists of the salt-tolerant thick oil viscosity reducing composition of the embodiment 9 and simulated formation water, wherein the mineralization degree of the simulated formation water is 10 multiplied by 10 4 mg/L, calcium and magnesium ion content is 2000mg/L. Specifically, the composition comprises the following components in percentage by mass: the nonionic gemini surfactant GCY-1:1.0% sodium dodecylbenzenesulfonate ABS:1.0%, EDTA-2Na:1.0% and the balance of simulated formation water.
Example 22
The salt-tolerant thick oil viscosity reducer of the embodiment consists of the salt-tolerant thick oil viscosity reducing composition of the embodiment 10 and simulated formation water, wherein the mineralization degree of the simulated formation water is 10 multiplied by 10 4 mg/L, calcium and magnesium ion content is 2000mg/L. Specifically, the composition comprises the following components in percentage by mass: the nonionic gemini surfactant GCY-1:1.0% sodium dodecylbenzenesulfonate ABS:1.0%, ammonium citrate: 1.0% and the balance of simulated formation water.
Example 23
The salt-tolerant thick oil viscosity reducer of the embodiment consists of the salt-tolerant thick oil viscosity reducing composition of the embodiment 11 and simulated formation water, wherein the mineralization degree of the simulated formation water is 10 multiplied by 10 4 mg/L, calcium and magnesium ion content is 2000mg/L. Specifically, the composition comprises the following components in percentage by mass: the nonionic gemini surfactant GCY-1:1.0% sodium dodecylbenzenesulfonate ABS:1.0%, ammonium citrate:0.2% and the balance of simulated formation water.
Example 24
The salt-tolerant thick oil viscosity reducer of the embodiment consists of the salt-tolerant thick oil viscosity reducing composition of the embodiment 12 and simulated formation water, wherein the mineralization degree of the simulated formation water is 10 multiplied by 10 4 mg/L, calcium and magnesium ion content is 2000mg/L. Specifically, the composition comprises the following components in percentage by mass: the nonionic gemini surfactant GCY-1:1.0% sodium dodecylbenzenesulfonate ABS:1.0%, ammonium citrate: 0.3% and the balance of simulated formation water.
3. Comparative example
Comparative example 1
The salt-tolerant thickened oil viscosity reducer of the comparative example is based on the example 13, and the nonionic Gimmy surfactant GCY-1 is changed into alkyl alcohol polyoxyethylene ether sodium sulfate AES. Specifically, the composition comprises the following components in percentage by mass: sodium alkali lignin sulfonate LDP-2:1.0% alkyl alcohol polyoxyethylene ether sodium sulfate AES:1.0%, ammonium citrate: 0.2 percent of simulated formation water, the rest is simulated formation water, and the mineralization degree of the simulated formation water is 10 multiplied by 10 4 mg/L, calcium and magnesium ion content is 2000mg/L.
Comparative example 2
The salt-tolerant thick oil viscosity reducer of the comparative example is based on the example 13, and the nonionic Gimmy surfactant GCY-1 is changed into a fluorocarbon viscosity reducer FCX. Specifically, the composition comprises the following components in percentage by mass: sodium alkali lignin sulfonate LDP-2:1.0% fluorocarbon viscosity reducing agent FCX:1.0%, ammonium citrate: 0.2 percent of simulated formation water, the rest is simulated formation water, and the mineralization degree of the simulated formation water is 10 multiplied by 10 4 mg/L, calcium and magnesium ion content is 2000mg/L.
Comparative example 3
The salt-tolerant thick oil viscosity reducer of the comparative example is based on the example 13, and sodium alkali lignin sulfonate LDP-2 is changed into sodium alkyl sulfate SDS. Specifically, the composition comprises the following components in percentage by mass: sodium alkyl sulphate, SDS:1.0%, nonionic gemini surfactant GCY-1:1.0%, ammonium citrate: 0.2 percent of simulated formation water, the rest is simulated formation water, and the mineralization degree of the simulated formation water is 10 multiplied by 10 4 mg/L, calcium and magnesium ion content is 2000mg/L.
Comparative example 4
The salt-tolerant thick oil viscosity reducer of the comparative example is modified from EDTA-2Na to sodium hexametaphosphate on the basis of example 21. Specifically, the composition comprises the following components in percentage by mass: sodium dodecyl benzene sulfonate ABS:1.0%, nonionic gemini surfactant GCY-1:1.0%, sodium hexametaphosphate: 1.0% and the balance of simulated formation water with mineralization degree of 10×10 4 mg/L, calcium and magnesium ion content is 2000mg/L.
Comparative example 5
The salt-tolerant thick oil viscosity reducer of the comparative example is based on the example 21, and EDTA-2Na is changed into sodium alginate. Specifically, the composition comprises the following components in percentage by mass: sodium dodecyl benzene sulfonate ABS:1.0%, nonionic gemini surfactant GCY-1:1.0% sodium alginate: 1.0% and the balance of simulated formation water with mineralization degree of 10×10 4 mg/L, calcium and magnesium ion content is 2000mg/L.
Comparative example 6
The salt-tolerant thickened oil viscosity reducer of the comparative example does not contain an ion stabilizer on the basis of the example 21. Specifically, the composition comprises the following components in percentage by mass: sodium dodecyl benzene sulfonate ABS:1.0%, nonionic gemini surfactant GCY-1:1.0% and the balance of simulated formation water with mineralization degree of 10×10 4 mg/L, calcium and magnesium ion content is 2000mg/L.
Comparative example 7
The salt-tolerant thick oil viscosity reducer of the comparative example was changed from 0.2% to 0.1% in terms of example 23. Specifically, the composition comprises the following components in percentage by mass: sodium dodecyl benzene sulfonate ABS:1.0%, nonionic gemini surfactant GCY-1:1.0%, ammonium citrate: 0.1% of simulated formation water, the balance of simulated formation water having a mineralization of 10 x 10 4 mg/L, calcium and magnesium ion content is 2000mg/L.
4. Application of experimental example salt-tolerant thickened oil viscosity reducer in development of high-salinity thickened oil reservoir
Experimental example 1 screening of nonionic surfactants
In the experimental example, the viscosity reduction effect of the viscosity reducer is evaluated by changing the type of the nonionic surfactant and fixing the weight percentage of other components in the formula.
The anionic surfactant is sodium alkali lignin sulfonate, and the ionic stabilizer is ammonium citrate. Specifically, the salt-tolerant thick oil viscosity reducer consists of the following components in percentage by mass: sodium alkali lignin sulfonate: 1.0%, ammonium citrate: 0.2%, nonionic surfactant: 1.0% and the balance of simulated formation water, mineralization degree 10 x 10 4 mg/L, calcium and magnesium ion content is 2000mg/L.
In the experiment, the crude oil is spring 10 well crude oil of spring light oil field, the viscosity of the crude oil is 17847 mPa.s (50 ℃), and the experiment temperature is 50 ℃. The experimental results are shown in Table 1.
TABLE 1 non-ionic surfactant screening
As shown in Table 1, the gemini surfactant has two hydrophilic groups and hydrophobic groups, and reduces the electrostatic repulsive force between two polarities and the acting force between hydration layers, so that the gemini surfactant has better performance than the traditional surfactant. The alkylphenol ethoxylates and the fatty alcohol ethoxylates also have good viscosity reduction performance on the spring-light thick oil. The fluorocarbon viscosity reducing agent has the reverse phase phenomenon of water-in-oil, and the viscosity is obviously increased. Therefore, the nonionic surfactant has good viscosity reduction effect on the spring-light thick oil by using the Gibby surfactant, the alkylphenol ethoxylates and the fatty alcohol ethoxylates.
Experimental example 2 screening of anionic surfactant
In the experimental example, the viscosity reduction effect of the viscosity reducer is evaluated by changing the type of the anionic surfactant and fixing the weight percentage of other components in the formula.
The nonionic surfactant is nonionic Gilmidz surfactant, and the ionic stabilizer is ammonium citrate. Specifically, the salt-tolerant thick oil viscosity reducer consists of the following components in percentage by mass: nonionic gemini surfactant: 1.0%, ammonium citrate: 0.2%, anionic surfactant: 1.0%, which isThe balance being simulated formation water, the mineralization degree is 10 multiplied by 10 4 mg/L, calcium and magnesium ion content is 2000mg/L.
In the experiment, the crude oil is spring 10 well crude oil of spring light oil field, the viscosity of the crude oil is 17847 mPa.s (50 ℃), and the experiment temperature is 50 ℃. The experimental results are shown in Table 2.
TABLE 2 anionic surfactant screening
From Table 2, it is clear that the anionic surfactant has good viscosity reduction effect on the spring-light thick oil by using alkali lignin sulfonate and petroleum benzene sulfonate.
Experimental example 3 screening of ionic stabilizer species
The experimental example evaluates the viscosity reduction effect of the viscosity reducer and the phenomenon of the stratum water after mixing by changing the type of the ion stabilizer and fixing the weight percentage of other components in the formula.
The nonionic surfactant is nonionic Gilmis surfactant, and the anionic surfactant is sodium dodecyl benzene sulfonate. Specifically, the salt-tolerant thick oil viscosity reducer consists of the following components in percentage by mass: nonionic gemini surfactant: 1.0%, sodium dodecyl benzene sulfonate: 1.0%, ionic stabilizer: 1.0% and the balance of simulated formation water, mineralization degree 10 x 10 4 mg/L, calcium and magnesium ion content is 2000mg/L.
In the experiment, the crude oil is spring 10 well crude oil of spring light oil field, the viscosity of the crude oil is 17847 mPa.s (50 ℃), and the experiment temperature is 50 ℃. The experimental results are shown in Table 3.
TABLE 3 screening of ion stabilizers
From Table 3, it is clear that EDTA-2Na and ammonium citrate have a remarkable shielding effect on metal ions of spring-light formation water.
Experimental example 4 optimization of the amount of the ion stabilizer
The experimental example fixes the weight percentage of other components in the formula by changing the dosage of the ionic stabilizer, and specifically fixes the nonionic gemini surfactant: 1.0%, sodium dodecyl benzene sulfonate: 1.0% and the balance of simulated formation water, mineralization degree 10 x 10 4 mg/L, calcium and magnesium ion content is 2000mg/L. And evaluating the viscosity reduction effect of the viscosity reducer and the phenomenon of the mixed formation water.
In the experiment, the crude oil is spring 10 well crude oil of spring light oil field, the viscosity of the crude oil is 17847 mPa.s (50 ℃), the stratum water is 206-10 wells, and the experiment temperature is 50 ℃. The experimental results are shown in Table 4.
TABLE 4 optimization of the amount of ionic stabilizers used
| Experimental group | Adhesive code number | Mixing with formation water | Viscosity reduction condition | Viscosity after viscosity reduction |
| Comparative example 7 | 0.1% ammonium citrate | Clear, with a small amount of floc in the lower part | Dispersing and flocculating crude oil | / |
| Example 23 | 0.2% ammonium citrate | Clear and clear | Emulsifying uniformly | 68.72 |
| Example 24 | 0.3% ammonium citrate | Clear and clear | Emulsifying uniformly | 66.85 |
From Table 4, it is clear that the ion stabilizer can play a role of shielding and complexing metal ions at an amount of 0.2%, and reduce the influence of formation water on the viscosity reducer.
Experimental example 5 mineralization resistance test of salt-tolerant heavy oil viscosity reducer
The experimental example examines the viscosity reduction effect of the salt-tolerant thickened oil viscosity reducer under different mineralization degrees. The viscosity reducer formulation of example 13 was used, wherein simulated formation water of varying degrees of mineralization was added when formulating the viscosity reducer. The crude oil sample adopts spring 10-well crude oil, the experimental temperature is 50 ℃, and the experimental results are shown in Table 5.
TABLE 5 mineralization resistance test of salt tolerant thickened oil viscosity reducer
| Simulated formation water mineralization degree mg/L | Viscosity before action mPas | Post-action viscosity mPas | Viscosity-reducing rate% |
| 89257 | 17847 | 67.1 | 99.6 |
| 95781 | 17847 | 85.9 | 99.5 |
| 100281 | 17847 | 95.5 | 99.5 |
Experimental example 6 temperature resistance test of viscosity reducer
The temperature resistance of the salt-tolerant thickened oil viscosity reducer is examined in the embodiment. The viscosity reducer of example 13 was used, placed in a reactor, and placed at high temperature and high pressure for a period of time, and then surface tension and viscosity reduction before and after aging were measured, and the experimental crude oil was spring 10-well crude oil, and the results are shown in Table 6 and FIG. 1 below.
Table 6 thermal stability test of salt tolerant thickened oil viscosity reducer
The experimental result shows that the viscosity reducer has small change of surface tension after high temperature and small change of physical and chemical properties after high temperature.
The viscosity reducing agent is subjected to constant temperature heat treatment at 300 ℃ for 4 hours, 8 hours and 24 hours, the viscosity reducing performance change condition of the viscosity reducing agent is observed, and the indoor experimental results are shown in Table 7. As shown by the indoor experimental results, the viscosity reducing agent formula can still keep a good emulsification viscosity reducing effect after 24 hours of high-temperature treatment.
TABLE 7 evaluation of viscosity reduction effect by different heat treatment times (spring 10 well crude oil, 300 ℃ C.)
| Treatment time/h | Emulsification effect | Emulsion viscosity/(mPa.s) |
| 0 | Uniform and good emulsification | 68.72 |
| 4 | Uniform and good emulsification | 72.36 |
| 8 | Uniform and good emulsification | 73.25 |
| 24 | Uniform and good emulsification | 74.03 |
As can be seen from Table 7 and FIG. 1, the emulsions were uniformly dispersed at 300℃for different treatment times, indicating good temperature resistance of the viscosity-reducing agent.
Experimental example 7 viscosity reduction performance verification of salt-tolerant heavy oil viscosity reducer
The salt-tolerant thick oil viscosity reducer of examples 13-15 is used in the experimental example to perform viscosity reduction performance verification by referring to the national petrochemical group company enterprise standard Q/SHCG 65-2013 thick oil viscosity reducer technical requirement. Taking thick oil of a certain well, wherein the mass ratio of the thick oil to the viscosity reducer solution is 7: and 3, uniformly mixing the components by using a glass rod at 50 ℃ and performing viscosity reducer viscosity reduction test. The results of the performance test are shown in Table 8.
Table 8 verification of viscosity breaking Properties of salt-tolerant heavy oil viscosity reducer of examples 13-15
| Experimental group | Viscosity of the crude oil before treatment (mPa. S) | Viscosity of the treated heavy oil (mPa. S) | Viscosity reduction rate (%) |
| Example 13 | 25300 | 126.5 | 99.5 |
| Example 14 | 25300 | 75.9 | 99.7 |
| Example 15 | 25300 | 177.1 | 99.3 |
Experimental example 8 application effect of salt-tolerant thickened oil viscosity reducer in spring-light thickened oil area
The experimental example is that the salt-tolerant thick oil viscosity reducer of the embodiment 13 of the invention is used in a spring-light thick oil region of Henan oilfield division to develop field popularization and application.
Adding nonionic surfactant, anionic surfactant, ionic stabilizer and water into a stirring tank, stirring until the nonionic surfactant, anionic surfactant, ionic stabilizer and water are dissolved, continuously adding water, stirring uniformly, preparing into an aqueous solution with the mass fraction of 20-40%, extruding into an oil layer by using an extruding pump or a cement truck, then injecting steam normally, and carrying out production after stewing (at the moment, the content of each component is consistent with that in the embodiment 13). And 159 times of application are accumulated, 27744 tons of oil is added up, and the oil-gas ratio of the measure well reaches 0.41.
In conclusion, the salt-tolerant thickened oil viscosity-reducing composition provided by the invention has the advantages of wide sources, low price and simple preparation method, and the formed emulsified viscosity-reducing agent has low base number, pH value of about 8.5 and mineralization tolerance of 10 multiplied by 10 4 mg/L, the temperature resistance reaches 300 ℃, the emulsification effect on high-viscosity thick oil is good, the development effect of super-thick oil in spring-light oil fields is obviously improved in field application, provides technical support for normal exploitation of the hypersalinity sensitive super-heavy oil in spring light.
The above description is only a preferred embodiment of the present invention, and the patent protection scope of the present invention is defined by the claims, and all equivalent structural changes made by the specification and the drawings of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A salt-tolerant thickened oil viscosity-reducing composition, which is characterized in that: comprises nonionic surfactant, sulfonate type anionic surfactant and ionic stabilizer; the nonionic surfactant: sulfonate-type anionic surfactant: the mass ratio of the ion stabilizer is 0.5-1.5:0.5-1.5:0.2-1.
2. The salt-tolerant thickened oil viscosity reducing composition according to claim 1, characterized in that: the ion stabilizer is one or two of ammonium citrate and EDTA-2Na.
3. The salt-tolerant thickened oil viscosity reducing composition according to claim 1, characterized in that: the nonionic surfactant is any one of alkylphenol ethoxylates, fatty alcohol ethoxylates and gemini surfactants.
4. The salt-tolerant thickened oil viscosity reducing composition according to claim 1, characterized in that: the sulfonate type anionic surfactant is alkali lignin sulfonate or petroleum benzene sulfonate.
5. A salt-tolerant thick oil viscosity reducer is characterized in that: the viscosity reducer comprises the salt-tolerant thick oil viscosity reducing composition according to any one of claims 1 to 4 and water.
6. The salt-tolerant thickened oil viscosity reducer according to claim 5, characterized in that: the mass percentage of the ion stabilizer in the viscosity reducer is 0.2-1.0%.
7. Use of the salt-tolerant heavy oil viscosity reducing composition according to any one of claims 1 to 4 or the salt-tolerant heavy oil viscosity reducer according to claim 5 or 6 in development of a high salinity heavy oil reservoir.
8. The application of the salt-tolerant heavy oil viscosity reducing composition or the salt-tolerant heavy oil viscosity reducer in development of a high-salinity heavy oil reservoir, which is characterized in that: the mass ratio of the thick oil to the salt-tolerant thick oil viscosity reducer is 7 (3-4).
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