CN117050741A - Temperature-resistant salt-resistant viscosity-reducing oil displacement agent for common thickened oil, and preparation method and application thereof - Google Patents
Temperature-resistant salt-resistant viscosity-reducing oil displacement agent for common thickened oil, and preparation method and application thereof Download PDFInfo
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- 150000003839 salts Chemical class 0.000 title claims abstract description 51
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 27
- 239000003945 anionic surfactant Substances 0.000 claims abstract description 21
- 239000002736 nonionic surfactant Substances 0.000 claims abstract description 20
- 230000033558 biomineral tissue development Effects 0.000 claims abstract description 6
- 238000004945 emulsification Methods 0.000 claims abstract description 6
- 229910001425 magnesium ion Inorganic materials 0.000 claims abstract description 6
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 5
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000003921 oil Substances 0.000 claims description 116
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 49
- 238000003756 stirring Methods 0.000 claims description 26
- AOMUHOFOVNGZAN-UHFFFAOYSA-N N,N-bis(2-hydroxyethyl)dodecanamide Chemical group CCCCCCCCCCCC(=O)N(CCO)CCO AOMUHOFOVNGZAN-UHFFFAOYSA-N 0.000 claims description 19
- 229940031957 lauric acid diethanolamide Drugs 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 108010077895 Sarcosine Proteins 0.000 claims description 11
- 229940048098 sodium sarcosinate Drugs 0.000 claims description 8
- 239000000295 fuel oil Substances 0.000 claims description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 229910001424 calcium ion Inorganic materials 0.000 claims description 3
- 125000000217 alkyl group Chemical group 0.000 claims description 2
- 239000003995 emulsifying agent Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 239000008398 formation water Substances 0.000 claims 2
- 238000011084 recovery Methods 0.000 abstract description 4
- 235000019198 oils Nutrition 0.000 description 96
- 239000000203 mixture Substances 0.000 description 16
- 230000001804 emulsifying effect Effects 0.000 description 15
- 235000019441 ethanol Nutrition 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 13
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 8
- 239000000523 sample Substances 0.000 description 8
- 229940071089 sarcosinate Drugs 0.000 description 8
- 239000010779 crude oil Substances 0.000 description 7
- 239000003027 oil sand Substances 0.000 description 7
- 239000012488 sample solution Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 238000001035 drying Methods 0.000 description 6
- FSYKKLYZXJSNPZ-UHFFFAOYSA-N sarcosine Chemical compound C[NH2+]CC([O-])=O FSYKKLYZXJSNPZ-UHFFFAOYSA-N 0.000 description 6
- 239000011734 sodium Substances 0.000 description 5
- 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 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000003208 petroleum Substances 0.000 description 4
- 229910052708 sodium Inorganic materials 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- QRMLKVVWCJUMPR-UHFFFAOYSA-N BrCC[Na] Chemical compound BrCC[Na] QRMLKVVWCJUMPR-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229940043230 sarcosine Drugs 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 101100041681 Takifugu rubripes sand gene Proteins 0.000 description 2
- 238000010828 elution Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 235000019476 oil-water mixture Nutrition 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- JHJLBTNAGRQEKS-UHFFFAOYSA-M sodium bromide Chemical compound [Na+].[Br-] JHJLBTNAGRQEKS-UHFFFAOYSA-M 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000002191 fatty alcohols Chemical class 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229940051841 polyoxyethylene ether Drugs 0.000 description 1
- 229920000056 polyoxyethylene ether Polymers 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
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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
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C303/00—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides
- C07C303/32—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of salts of sulfonic acids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/204—Keeping clear the surface of open water from oil spills
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- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
Abstract
The invention provides a temperature-resistant salt-resistant viscosity-reducing oil displacement agent for common thickened oil, and a preparation method and application thereof, belongs to the technical field of oilfield chemistry, and can solve the technical problem that the conventional thickened oil viscosity-reducing agent cannot effectively meet the temperature-resistant salt resistance in thickened oil cold recovery. The invention provides a temperature-resistant salt-resistant viscosity-reducing oil displacement agent for common thickened oil, which comprises, by mass, 20% -25% of nonionic surfactant, 25% -30% of anionic surfactant, 15% -20% of high-temperature-resistant emulsification viscosity-reducing agent, 5% of auxiliary agent and the balance of water. The temperature-resistant salt-resistant thickened oil viscosity reducing agent can be effectively applied to a thickened oil reservoir with the temperature not more than 90 ℃ and the mineralization degree of stratum water not less than 100000mg/L and the calcium-magnesium ion not less than 5500mg/L, and has the viscosity reducing rate not less than 95%, the wash oil rate not less than 45% and the interfacial tension not more than 8.2X10 ‑2 Can effectively improve the viscosity reduction rate of the thick oil of the high-temperature salt reservoirHigh thick oil recovery rate.
Description
Technical Field
The invention belongs to the technical field of oilfield chemistry, and particularly relates to a temperature-resistant salt-resistant viscosity-reducing oil displacement agent for common thickened oil, and a preparation method and application thereof.
Background
Along with the deep development of water injection, the production of most heavy oil reservoirs is gradually reduced due to the influence of factors such as aggravation of injection and production contradiction, reduction of stratum energy, blockage of reservoirs and the like, and heavy oil blocks easy to produce are continuously reduced. Efficient thickened oil recovery is an important task in recent years. The main technologies of thickened oil exploitation are thermal exploitation and cold exploitation, wherein the technology of improving the recovery ratio of thickened oil cold exploitation is paid more attention to, and the chemical viscosity reducing agent method in thickened oil cold exploitation is a novel technology.
The existing thick oil viscosity reducing agent technology is generally resistant to temperature difference, easy to hydrolyze, difficult to form stable emulsion under high mineralization, difficult to expand swept volume and improve oil displacement efficiency in a high-temperature high-salt oil layer, and incapable of meeting the thick oil exploitation requirement of a high-temperature high-salt oil reservoir.
Disclosure of Invention
The invention provides a temperature-resistant salt-resistant viscosity-reducing oil displacement agent for common thickened oil, and a preparation method and application thereof.
In order to achieve the aim, the invention provides a temperature-resistant salt-resistant common thickened oil viscosity-reducing oil displacement agent which comprises, by mass, 20% -25% of a nonionic surfactant, 25% -30% of an anionic surfactant, 15% -20% of a high-temperature-resistant emulsifying viscosity-reducing agent, 5% of an auxiliary agent and the balance of water.
Preferably, the high temperature resistant emulsifying viscosity reducing agent AESO has the following structural formula:
CH 3 CH 2 CH 2 -CH 2 CH 2 (OCH 2 CH 2 )n-SO 3 na, wherein n is an integer of 3 to 5.
Preferably, the high temperature resistant emulsifying viscosity reducing agent AESO is obtained by the following synthesis method:
respectively weighing n (fatty alcohol polyoxyethylene ether AEO) and n (2-bromoethyl sodium sulfonate) in a molar ratio of 1:1.3, firstly placing AEO in a reaction container, heating until all AEO is molten, adding a proper amount of sodium hydroxide, stirring for 25-35min, and adding 2-bromoethyl sodium sulfonate while stirring;
after the reaction is finished, brown paste appears, the brown paste is dissolved in absolute ethyl alcohol, unreacted 2-bromoethyl sodium sulfonate is removed, absolute ethyl alcohol is evaporated at 80 ℃, finally, the product is recrystallized by absolute ethyl alcohol, and the AESO solid product is obtained after vacuum drying.
The synthesis principle of the high temperature resistant emulsification viscosity reducer AESO is as follows:
R(OCH 2 CH 2 )nONa+BrCH 2 CH 2 SO 3 Na→R(OCH 2 CH 2 )SO 3 Na+NaBr
preferably, the anionic surfactant N-acyl sarcosine sodium has a molecular formula as follows:
wherein R is a C8-C14 higher alkyl group.
Preferably, the nonionic surfactant is lauric acid diethanolamide.
Preferably, the auxiliary agent is ethanol.
The invention also provides a preparation method of the temperature-resistant salt-resistant common thickened oil viscosity-reducing oil displacement agent according to any one of the technical schemes, which comprises the following steps:
adding a high temperature resistant viscosity reducing emulsifier AESO into a reaction kettle, adding ethanol, stirring uniformly at 30-40 ℃, sequentially adding N-acyl sodium sarcosinate, lauric acid diethanolamide and water, and stirring for 30-40min to obtain the temperature resistant salt resistant common viscous oil viscosity reducing oil displacement agent.
The invention also provides application of the temperature-resistant salt-resistant viscosity-reducing oil displacement agent for common heavy oil in exploitation of heavy oil reservoirs, wherein the temperature is less than or equal to 90 ℃, the mineralization degree of stratum water is more than or equal to 100000mg/L, and calcium and magnesium ions are more than or equal to 5500 mg/L.
Preferably, the temperature-resistant and salt-resistant aqueous solution with the concentration of 0.3% is used as the common thickened oil viscosity-reducing oil displacement agent.
Preferably, when the temperature-resistant salt-resistant common thickened oil viscosity-reducing oil displacement agent is applied to a thickened oil reservoir with the temperature of less than or equal to 90 ℃ and the mineralization degree of stratum water of more than or equal to 100000mg/L and the calcium and magnesium ions of more than or equal to 5500mg/L, the viscosity-reducing rate is more than or equal to 95%, the wash oil rate is more than or equal to 45%, and the interfacial tension is less than or equal to 8.2X10 -2 。
Compared with the prior art, the invention has the advantages and positive effects that:
1. the viscosity-reducing oil displacement agent for the temperature-resistant and salt-resistant thick oil has good solubility, excellent temperature resistance and salt resistance, strong solution stability and difficult hydrolysis under stratum for a long time.
2. The temperature-resistant and salt-resistant viscous oil-reducing oil-displacing agent can effectively change the wettability of a stratum at high temperature, increase the oil-water wave volume and improve the oil-displacing efficiency.
3. The temperature-resistant salt-resistant viscous oil displacement agent for thick oil has simple production process, easily purchased raw materials, does not contain organic chlorine, and meets the requirements of green environmental protection.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
150kg of temperature-resistant emulsifying viscosity reducer AESO is added into a reaction kettle, 50kg of ethanol is added, stirring is carried out uniformly at 30-40 ℃, 300kg of anionic surfactant N-acyl sarcosinate, 250kg of nonionic surfactant lauric acid diethanolamide and 250kg of water are sequentially added, and stirring is carried out for 30-40min, thus obtaining the temperature-resistant salt-resistant common thickened oil viscosity reducing oil displacement agent.
Example 2
160kg of temperature-resistant emulsifying viscosity reducer AESO is added into a reaction kettle, 50kg of ethanol is added, stirring is carried out uniformly at 30-40 ℃, 290kg of anionic surfactant N-acyl sarcosinate, 240kg of nonionic surfactant lauric acid diethanolamide and 260kg of water are sequentially added, and stirring is carried out for 30-40min, thus obtaining the temperature-resistant salt-resistant common thickened oil viscosity reducing oil displacement agent.
Example 3
170kg of temperature-resistant emulsifying viscosity reducer AESO is added into a reaction kettle, 50kg of ethanol is added, stirring is carried out uniformly at 30-40 ℃, 280kg of anionic surfactant N-acyl sarcosinate, 230kg of nonionic surfactant lauric acid diethanolamide and 270kg of water are sequentially added, and stirring is carried out for 30-40min, thus obtaining the temperature-resistant salt-resistant common thickened oil viscosity reducing oil displacement agent.
Example 4
180kg of temperature-resistant emulsifying viscosity reducer AESO is added into a reaction kettle, 50kg of ethanol is added, stirring is carried out uniformly at 30-40 ℃, 270kg of anionic surfactant N-acyl sarcosinate, 220kg of nonionic surfactant lauric acid diethanolamide and 280kg of water are sequentially added, and stirring is carried out for 30-40min, thus obtaining the temperature-resistant salt-resistant common thickened oil viscosity reducing oil displacement agent.
Example 5
Adding 190kg of temperature-resistant emulsifying viscosity reducer AESO into a reaction kettle, adding 50kg of ethanol, uniformly stirring at 30-40 ℃, sequentially adding 260kg of anionic surfactant N-acyl sodium sarcosinate, 210kg of nonionic surfactant lauric acid diethanolamide and 290kg of water, and stirring for 30-40min to obtain the temperature-resistant salt-resistant common thickened oil viscosity reducing oil displacement agent.
Example 6
200kg of temperature-resistant emulsifying viscosity reducer AESO is added into a reaction kettle, 50kg of ethanol is added, stirring is carried out uniformly at 30-40 ℃, 250kg of anionic surfactant N-acyl sarcosinate, 200kg of nonionic surfactant lauric acid diethanolamide and 300kg of water are sequentially added, and stirring is carried out for 30-40min, thus obtaining the temperature-resistant salt-resistant common thickened oil viscosity reducing oil displacement agent.
Comparative example 1
50kg of ethanol, 300kg of anionic surfactant N-acyl sarcosine sodium, 250kg of nonionic surfactant lauric acid diethanolamide and 400kg of water are added into a reaction kettle, and the mixture is stirred for 30-40min to obtain the temperature-resistant salt-resistant common thickened oil viscosity-reducing oil displacement agent.
Comparative example 1 is a temperature-resistant and salt-resistant normal thickened oil viscosity-reducing oil displacement agent obtained by removing the high temperature-resistant emulsification viscosity-reducing agent AESO in the formula of example 1, wherein the amount of the high temperature-resistant emulsification viscosity-reducing agent is supplemented by water.
Comparative example 2
150kg of temperature-resistant emulsifying viscosity reducer AESO is added into a reaction kettle, 50kg of ethanol is added, the mixture is stirred uniformly at 30-40 ℃, 250kg of nonionic surfactant lauric acid diethanolamide and 550kg of water are added, and the mixture is stirred for 30-40min, so that the temperature-resistant salt-resistant common viscous oil viscosity reducing oil displacement agent is obtained.
Comparative example 2 is a temperature-resistant and salt-resistant normal thickened oil viscosity-reducing oil displacement agent obtained by removing the anionic surfactant N-acyl sodium sarcosinate in the formula of example 1, wherein the amount of the anionic surfactant N-acyl sodium sarcosinate is supplemented by water.
Comparative example 3
150kg of temperature-resistant emulsifying viscosity reducer AESO is added into a reaction kettle, 50kg of ethanol is added, the mixture is stirred uniformly at the temperature of 30-40 ℃, 300kg of anionic surfactant N-acyl sodium sarcosinate and 500kg of water are added, and the mixture is stirred for 30-40min, so that the temperature-resistant salt-resistant common thickened oil viscosity reducing oil displacement agent is obtained.
Comparative example 3 is a temperature-resistant and salt-resistant normal thickened oil viscosity-reducing oil displacement agent obtained by removing the non-ionic surfactant lauric acid diethanolamide in the formula of example 1, wherein the amount of the non-ionic surfactant lauric acid diethanolamide is supplemented by water.
Comparative example 4
Adding 140kg of high-temperature-resistant emulsifying viscosity-reducing agent AESO into a reaction kettle, adding 50kg of ethanol, uniformly stirring at 30-40 ℃, sequentially adding 300kg of anionic surfactant N-acyl sodium sarcosinate, 250kg of nonionic surfactant lauric acid diethanolamide and 260kg of water, and stirring for 30-40min to obtain the temperature-resistant salt-resistant common thickened oil viscosity-reducing oil displacement agent.
Comparative example 4 is a temperature-resistant salt-resistant common thickened oil viscosity-reducing oil displacement agent obtained by adjusting the amount of the high-temperature-resistant emulsification viscosity-reducing agent AESO in the formula of example 1 to 140kg (the content is reduced to 14%), and the reduced amount is supplemented by water.
Comparative example 5
150kg of temperature-resistant emulsifying viscosity reducer AESO is added into a reaction kettle, 50kg of ethanol is added, stirring is carried out uniformly at 30-40 ℃, 300kg of anionic surfactant N-acyl sarcosinate, 190kg of nonionic surfactant lauric acid diethanolamide and 310kg of water are sequentially added, and stirring is carried out for 30-40min, thus obtaining the temperature-resistant salt-resistant common thickened oil viscosity reducing oil displacement agent.
Comparative example 5 is a high temperature resistant emulsified viscosity reducing agent obtained by adjusting the amount of the nonionic surfactant lauric acid diethanolamide in the formulation of example 1 to 190kg (content reduced to 19%), the reduced amount being made up by water.
Comparative example 6
150kg of temperature-resistant emulsifying viscosity reducer AESO is added into a reaction kettle, 50kg of ethanol is added, stirring is carried out uniformly at 30-40 ℃, 240kg of anionic surfactant N-acyl sarcosinate, 250kg of nonionic surfactant lauric acid diethanolamide and 310kg of water are sequentially added, and stirring is carried out for 30-40min, thus obtaining the temperature-resistant salt-resistant common thickened oil viscosity reducing oil displacement agent.
Comparative example 6 the anionic surfactant sodium N-acyl sarcosinate in the formulation of example 1 was adjusted to 240kg (24% reduction) with water make up the reduction.
Performance testing
1. Test instrument: DV-3T rheometer, constant temperature drying oven, TX-500C type full-range rotary drop interface tensiometer
2. Experimental temperature: 90 DEG C
3. Experimental oil-water: a certain block of dehydrated crude oil (viscosity 3250mpa.s at reservoir temperature) of the victory oil field was block injected with water: 100000mg/L, calcium magnesium ion content: 5500mg/L
4. The common thickened oil viscosity-reducing oil displacement agent with the temperature resistance and the salt resistance is prepared into aqueous solution with the concentration of 0.3 percent by injecting water into a certain area of a victory oil field.
Interfacial tension test:
and measuring the interfacial tension between the oil displacement agent sample solution and the experimental oil sample at 90 ℃, and recording the lowest value of the interfacial tension.
And (3) viscosity reduction rate test:
placing the experimental oil sample in a constant temperature drying oven, and adding the experimental oil sample into the oilKeeping the temperature at the storage temperature for 1h. The temperature measured by the rotary viscometer is 90 ℃, the experimental oil sample is poured into a measuring cylinder of the rotary viscometer, and the shearing rate is set to be 60s -1 The experimental oil-sample viscosity at reservoir temperature was tested as specified in SY/T0520-2008 at 4.4.
Preparing 100g of a temperature-resistant salt-resistant viscosity-reducing oil displacement agent for common thickened oil with the concentration of 3%, weighing 20g of a sample solution, putting the sample solution into a 250mL beaker, and then adding 80g of an experimental oil sample to ensure that the mass ratio of the experimental oil sample to the sample solution is 8:2. Sealing, placing in a constant temperature drying oven, and keeping constant temperature for 2h at the oil reservoir temperature. Taking out the sample, continuously stirring the oil-water mixture with a glass rod at a speed of 100 times/min for 3min to uniformly mix the oil and the water, rapidly pouring the mixture into a measuring cylinder of a rotary viscometer, setting the shearing speed to be 60s < -1 >, and measuring the viscosity of the oil-water mixture at 90 ℃.
And (3) washing oil rate test:
mixing simulated stratum sand and experimental oil samples according to the mass ratio of 4:1, placing the mixture into a constant-temperature drying oven, aging the mixture for 7d at 90 ℃, stirring the mixture once a day, uniformly mixing the oil sand, and taking the mixture out for later use. Weighing 5g aged oil sand (with mass of m, accurate to 0.001 g) and placing into a conical flask (with mass of m 1 Accurate to 0.001 g), 50g of 0.3% oil displacement agent sample solution is added, and the mixture is fully and uniformly mixed and then is kept stand at 90 ℃ for 48h. The crude oil floating in the sample solution after standing and the crude oil adhering to the bottle wall were dipped out with clean cotton yarn, the sample solution was poured out, the oil sand was rinsed with distilled water until no foam was formed, and the solution was carefully poured out. The conical flask was baked to constant weight in a constant temperature oven at 105℃and weighed (noted m 2 Accurate to 0.001 g). The dried oil sand is subjected to crude oil elution by petroleum ether until the petroleum ether is colorless, and the conical flask of the eluted crude oil is placed in a baking oven at 120 ℃ for drying for 2 hours, and is weighed (recorded as m3 and accurate to 0.001 g). Crude oil elution is carried out on the dried oil sand by petroleum ether until the petroleum ether is colorless, a conical flask of the eluted crude oil is placed in a baking oven at 120 ℃ for drying for 2 hours, and the mixture is weighed (recorded as m 3 Accurate to 0.001 g)
The wash oil rate is calculated as follows:
δ＝(m+m 1 -m 2 )/(m+m 1 -m 3 )×100％
delta-wash oil ratio, expressed in percent;
the mass of the m-aged oil sand is expressed in grams;
m 1 the mass of the conical flask in grams;
m 2 -total mass of erlenmeyer flask and oil sand after washing oil, in grams;
m 3 -total mass of erlenmeyer flask and washed formation sand in grams;
the temperature-resistant salt-resistant common thickened oil viscosity-reducing oil displacement agent prepared in the examples 1-6 and the comparative examples 1-6 is subjected to interfacial tension, viscosity-reducing rate and oil washing rate tests according to the test methods, and the test results are shown in table 1. The following parameters are used as the standard: interfacial tension is less than or equal to 9.9X10 -2 The viscosity reduction rate is more than or equal to 95 percent, and the wash oil rate is more than or equal to 40 percent.
Table 1: performance test of temperature-resistant salt-resistant common thickened oil viscosity-reducing oil displacement agent
As can be seen from the above Table 1, the formulation provided by the present invention can make the obtained temperature-resistant salt-resistant common thickened oil viscosity-reducing oil-displacing agent satisfy the interfacial tension of less than or equal to 9.9X10 under the synergistic effect of the temperature-resistant emulsifying viscosity-reducing agent, the anionic surfactant, the nonionic surfactant and the component proportions thereof -2 The viscosity reduction rate is more than or equal to 95%, the wash oil rate is more than or equal to 40%, and the performance is more advantageous than that of the oil washing agent, and the interfacial tension is less than or equal to 8.2 multiplied by 10 -2 This is because AESO can significantly improve viscosity reduction rate under high temperature and high salt, N-acyl sarcosine sodium can increase oil-water wave volume, oil displacement efficiency is improved, lauric acid diethanolamide can reduce effective low interfacial tension, and the three can effectively change formation wettability, increase oil-water wave volume, and improve oil displacement efficiency if a certain component or component is absentThe amount of the components used is not within the range defined by the present invention, and may affect the index to be tested, so that it is not acceptable.
Claims (9)
1. The temperature-resistant salt-resistant viscosity-reducing oil displacement agent for common thickened oil is characterized by comprising, by mass, 20% -30% of nonionic surfactant, 15% -25% of anionic surfactant, 10% -20% of high-temperature-resistant emulsification viscosity-reducing agent, 5% -10% of auxiliary agent and the balance of water.
2. The temperature-resistant salt-resistant common thickened oil viscosity-reducing oil displacement agent according to claim 1, wherein the high-temperature-resistant emulsified viscosity-reducing agent AESO has the following structural formula:
CH 3 CH 2 CH 2 -CH 2 CH 2 (OCH 2 CH 2 )n-SO 3 na, wherein n is an integer of 3 to 5.
3. The temperature-resistant salt-resistant common thickened oil viscosity-reducing oil displacement agent according to claim 1, wherein the anionic surfactant is N-acyl sodium sarcosinate, and the molecular formula of the anionic surfactant is shown as follows:
wherein R is a C8-C14 higher alkyl group.
4. The temperature-resistant salt-resistant common thickened oil viscosity-reducing oil displacement agent according to claim 1, wherein the nonionic surfactant is lauric acid diethanolamide.
5. The temperature-resistant salt-resistant common thickened oil viscosity-reducing oil displacement agent according to claim 1, wherein the auxiliary agent is ethanol.
6. The method for preparing the temperature-resistant salt-resistant common thickened oil viscosity-reducing oil displacement agent according to any one of claims 1 to 5, which is characterized by comprising the following steps:
adding a high temperature resistant viscosity reducing emulsifier AESO into a reaction kettle, adding ethanol, stirring uniformly at 30-40 ℃, sequentially adding N-acyl sodium sarcosinate, lauric acid diethanolamide and water, and stirring for 30-40min to obtain the temperature resistant salt resistant common viscous oil viscosity reducing oil displacement agent.
7. The use of the temperature-resistant and salt-resistant viscosity-reducing oil displacement agent for common heavy oil, according to any one of claims 1 to 5, in exploitation of heavy oil reservoirs with the temperature of not more than 90 ℃ and the mineralization degree of formation water of not less than 100000mg/L and the calcium and magnesium ions of not less than 5500 mg/L.
8. The use according to claim 7, wherein the temperature-resistant and salt-resistant common thickened oil viscosity-reducing oil displacement agent is an aqueous solution with a concentration of 0.3%.
9. The use according to claim 8, wherein the temperature-resistant and salt-resistant viscosity-reducing oil displacement agent for common thickened oil has viscosity-reducing rate of 95%, wash rate of 45% and interfacial tension of 8.2X10% or less when used in a thickened oil reservoir with temperature of 90 ℃ or less, formation water mineralization of 100000mg/L or more and calcium-magnesium ion of 5500mg/L or more -2 。
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