CN117986285A - Viscosity-reducing oil washing agent for cold recovery of thickened oil and preparation method thereof - Google Patents
Viscosity-reducing oil washing agent for cold recovery of thickened oil and preparation method thereof Download PDFInfo
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- 238000005406 washing Methods 0.000 title claims abstract description 62
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 238000011084 recovery Methods 0.000 title claims description 35
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 61
- GLUUGHFHXGJENI-UHFFFAOYSA-N Piperazine Chemical compound C1CNCCN1 GLUUGHFHXGJENI-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000002904 solvent Substances 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000003054 catalyst Substances 0.000 claims abstract description 23
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 claims abstract description 20
- ISAOCJYIOMOJEB-UHFFFAOYSA-N benzoin Chemical compound C=1C=CC=CC=1C(O)C(=O)C1=CC=CC=C1 ISAOCJYIOMOJEB-UHFFFAOYSA-N 0.000 claims abstract description 20
- -1 pyridine-2-yl Chemical group 0.000 claims abstract description 12
- 244000028419 Styrax benzoin Species 0.000 claims abstract description 10
- 235000000126 Styrax benzoin Nutrition 0.000 claims abstract description 10
- 235000008411 Sumatra benzointree Nutrition 0.000 claims abstract description 10
- 229960002130 benzoin Drugs 0.000 claims abstract description 10
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 claims abstract description 10
- 235000019382 gum benzoic Nutrition 0.000 claims abstract description 10
- 239000012956 1-hydroxycyclohexylphenyl-ketone Substances 0.000 claims abstract description 4
- MQDJYUACMFCOFT-UHFFFAOYSA-N bis[2-(1-hydroxycyclohexyl)phenyl]methanone Chemical compound C=1C=CC=C(C(=O)C=2C(=CC=CC=2)C2(O)CCCCC2)C=1C1(O)CCCCC1 MQDJYUACMFCOFT-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000012650 click reaction Methods 0.000 claims abstract description 4
- MZRQZJOUYWKDNH-UHFFFAOYSA-N diphenylphosphoryl-(2,3,4-trimethylphenyl)methanone Chemical compound CC1=C(C)C(C)=CC=C1C(=O)P(=O)(C=1C=CC=CC=1)C1=CC=CC=C1 MZRQZJOUYWKDNH-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000003921 oil Substances 0.000 claims description 127
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 17
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 239000000295 fuel oil Substances 0.000 claims description 10
- 239000012965 benzophenone Substances 0.000 claims description 9
- 239000010779 crude oil Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- AFBBKYQYNPNMAT-UHFFFAOYSA-N 1h-1,2,4-triazol-1-ium-3-thiolate Chemical compound SC=1N=CNN=1 AFBBKYQYNPNMAT-UHFFFAOYSA-N 0.000 claims description 4
- 239000004927 clay Substances 0.000 claims description 2
- 230000009467 reduction Effects 0.000 abstract description 49
- 230000003068 static effect Effects 0.000 abstract description 13
- 230000033558 biomineral tissue development Effects 0.000 abstract description 4
- 239000012752 auxiliary agent Substances 0.000 abstract description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 3
- 239000011707 mineral Substances 0.000 abstract description 3
- 239000003973 paint Substances 0.000 abstract description 2
- 150000003839 salts Chemical class 0.000 abstract description 2
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 51
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 28
- 239000000243 solution Substances 0.000 description 22
- 239000011259 mixed solution Substances 0.000 description 18
- 230000000694 effects Effects 0.000 description 11
- 238000003756 stirring Methods 0.000 description 10
- 238000011161 development Methods 0.000 description 9
- 230000018109 developmental process Effects 0.000 description 9
- 238000004090 dissolution Methods 0.000 description 9
- 238000001291 vacuum drying Methods 0.000 description 9
- 239000003638 chemical reducing agent Substances 0.000 description 6
- 238000004945 emulsification Methods 0.000 description 6
- 239000004094 surface-active agent Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 239000013043 chemical agent Substances 0.000 description 4
- 239000000839 emulsion Substances 0.000 description 4
- 230000015784 hyperosmotic salinity response Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 125000004105 2-pyridyl group Chemical group N1=C([*])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 125000000623 heterocyclic group Chemical group 0.000 description 1
- GGQOPZKTDHXXON-UHFFFAOYSA-N hexane;methanol Chemical compound OC.CCCCCC GGQOPZKTDHXXON-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 239000000693 micelle Substances 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000007764 o/w emulsion Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000009671 shengli Substances 0.000 description 1
- 230000009154 spontaneous behavior Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
- C07F7/02—Silicon compounds
- C07F7/08—Compounds having one or more C—Si linkages
- C07F7/0834—Compounds having one or more O-Si linkage
- C07F7/0838—Compounds with one or more Si-O-Si sequences
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
- C07F7/02—Silicon compounds
- C07F7/08—Compounds having one or more C—Si linkages
- C07F7/0834—Compounds having one or more O-Si linkage
- C07F7/0838—Compounds with one or more Si-O-Si sequences
- C07F7/0872—Preparation and treatment thereof
- C07F7/0889—Reactions not involving the Si atom of the Si-O-Si sequence
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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
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention belongs to the technical field of thickened oil exploitation auxiliary agents, and particularly relates to a viscosity-reducing oil washing agent for thickened oil cold exploitation and a preparation method thereof. The preparation method comprises the following steps: under the condition of ultraviolet irradiation, 3-mercapto-alkyl-1, 3, 5-heptamethyl trisiloxane and 1- (3-olefine pyridine-2-yl) piperazine are subjected to click reaction in the presence of a catalyst and a solvent, wherein the catalyst is one of benzoin dimethyl ether, 2,4,6 (trimethyl benzoyl) diphenyl phosphine oxide, 1-hydroxy-cyclohexyl-phenyl ketone and diphenyl ketone. When the viscosity reduction oil washing agent is used at the concentration of 500mg/L, the static viscosity reduction rate of the thick oil with the viscosity of 5000-30000 mPa.s at 50 ℃ is more than 90%, and the static oil washing rate is more than 50%; meanwhile, the mineral water-based paint has excellent salt resistance, and the mineralization resistance reaches over 200000 mg/L.
Description
Technical Field
The invention belongs to the technical field of thickened oil exploitation auxiliary agents, relates to a chemical auxiliary agent with viscosity reduction and efficient oil washing functions for thickened oil cold exploitation and a preparation method thereof, and in particular relates to a viscosity reduction oil washing agent for thickened oil cold exploitation and a preparation method thereof.
Background
Thick oil resources account for about 50% of the reserves of global oil and gas resources, and along with development of conventional oil and gas resources, thick oil resources with huge reserves occupy more and more important positions in energy structures. The victory oil field is taken as one of the main production bases of domestic thick oil, steam heating power is always the dominant technology for thick oil development, and good development effect is achieved in the mine. However, the thermal oil recovery consumes a large amount of fuel, increases the oil recovery cost, has the problems of easy steam channeling and the like, and is limited in field application under the low oil price and high environmental protection requirements. On the other hand, the thermal oil recovery technology has poor adaptability to thin-layer, deep-layer, sensitive and side-bottom water active heavy oil reservoirs. The thickened oil cold recovery technology can effectively make up the defects of thermal recovery, and particularly can reduce the tension of an oil-water interface and emulsify and disperse thickened oil after the chemical viscosity reduction compound development technology is injected into an oil layer, so that an oil-in-water emulsion is formed, and the method has the characteristics of high viscosity reduction rate, low cost and easiness in operation. The victory oil field continuously explores a thickened oil cold recovery development technology in recent years, and a certain development effect is obtained on site at present.
The thick oil emulsification and viscosity reduction system is a water-soluble surfactant, and indoor researches show that the surfactant has the effects of changing reservoir wettability, reducing interfacial tension and the like while generating emulsification and viscosity reduction effects with the thick oil, and the action mechanisms are also beneficial to improving the thick oil recovery ratio. The traditional thick oil chemical emulsification viscosity reduction mechanism is that surfactant micelles are surrounded on the thick oil and water interface through the stirring action of external force, so that the internal friction force between crude oil and crude oil is converted into the friction force between water and water, and the flow property of crude oil is greatly improved. Because of the strong agitation required for this emulsification, in theory, the transfer from the wellbore to the reservoir production, thick oil emulsions may not form under weak reservoir power conditions.
The chemical agent systems for the prior mining field test comprise depolymerized viscosity-reducing agent, self-diffusion viscosity-reducing agent, emulsion viscosity-reducing system and the like, and have the characteristics of improving the oil well yield and reducing the production cost. Research shows that the chemical agent systems applied to the chemical cold recovery of the heavy oil reservoir have better performance, but are not applied on a large scale, and the main reason is that the existing chemical agents cannot simultaneously have the key performances of viscosity reduction, efficient oil washing and the like under the condition of weak power of the deep part of the reservoir.
Disclosure of Invention
In order to solve the problem that the existing chemical agent cannot achieve the performance of efficient emulsification viscosity reduction and stripping wash oil under the condition of weak deep shearing driving force of an oil reservoir, the invention provides the viscosity reduction wash oil agent for cold recovery of thick oil and a preparation method thereof, wherein the viscosity reduction wash oil agent has excellent viscosity reduction effect, when the using concentration is 500mg/L, the static viscosity reduction rate of the thick oil with the viscosity of 5000-30000 mPa.s at 50 ℃ reaches more than 90%, and the static wash oil rate reaches more than 50%; meanwhile, the mineral oil reservoir has excellent salt tolerance, the mineralization tolerance reaches over 200000mg/L, and the requirements of cold recovery development of most heavy oil reservoirs in China are met.
According to a first aspect of the invention, the invention provides a preparation method of a viscosity-reducing oil washing agent for cold recovery of thickened oil, which comprises the following steps: under the condition of ultraviolet irradiation, 3-mercapto-1, 3, 5-heptamethyl trisiloxane and 1- (3-olefine pyridine-2-yl) piperazine undergo a click reaction in the presence of a catalyst and a solvent, wherein the catalyst is one of benzoin dimethyl ether, 2,4,6 (trimethyl benzoyl) diphenyl phosphine oxide, 1-hydroxy-cyclohexyl-phenyl ketone and benzophenone; the structure of the 3-mercaptoalkyl-1, 3, 5-heptamethyltrisiloxane is shown as a formula (1), and the structure of the 1- (3-olefine pyridine-2-yl) piperazine is shown as a formula (2);
wherein m is a positive integer of 1 to 8; n is a positive integer of 1 to 12.
According to a second aspect of the invention, the invention provides the viscosity reduction wash oil agent prepared by the preparation method according to the first aspect of the invention, wherein the viscosity reduction wash oil agent has a structure shown in a formula (3):
Wherein:
m is a positive integer of 1 to 8;
n is a positive integer of 1 to 12.
According to a third aspect of the invention, the invention provides the use of the viscosity-reducing oil wash of the second aspect of the invention in cold recovery of heavy oil.
The viscosity reduction oil washing agent for cold recovery of thick oil has the molecular formula of a silicon-containing surfactant, hydrophobic groups of the silicon-containing surfactant are benzene ring-containing, heterocyclic ring-containing and long carbon chain alkyl-containing groups, and the viscosity reduction oil washing agent is very similar to four components of thick oil and has very excellent affinity; meanwhile, the hydrophilic group is a long-chain group containing a silica group, wherein O element is easy to form a hydrogen bond with water molecules in a water phase, so that a layer of water film is formed on the surface of the oil phase, and an emulsifying effect is realized; in addition, as the silicon-containing groups are introduced on the molecules, the silicon-based groups have similar effects with the main components of oil reservoir minerals, so that the molecules are easy to interact on the interfaces of oil reservoir gravel and rock, the adhesion between crude oil and rock is reduced, and the effect of oil film stripping is realized. The action effect also belongs to spontaneous behavior, so that the surfactant has extremely strong wash oil and viscosity reduction performance, and meets the wash oil and emulsification viscosity reduction requirements under the deep low-power condition of the oil reservoir.
Compared with the prior art, the viscosity reduction oil washing agent for cold recovery of thick oil has the following advantages and beneficial effects:
(1) The invention has the advantages of wide raw material sources, simple synthesis process, high yield, clean and pollution-free process;
(2) The viscosity reduction oil washing agent has excellent viscosity reduction effect, when the using concentration is 500mg/L, the static viscosity reduction rate of the thick oil with the viscosity ranging from 5000 to 30000 mPa.s at 50 ℃ reaches more than 98 percent, and the static oil washing rate reaches more than 50 percent;
(3) The viscosity-reducing oil washing agent has excellent salt tolerance, does not influence the viscosity-reducing oil washing performance of mineralized water within 200000mg/L, and meets the requirements of cold recovery development of most heavy oil reservoirs in China.
Detailed Description
The endpoints of the ranges and any values disclosed in the present invention are not limited to the precise range or value, and the range or value should be understood to include values close to the range or value. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
According to a first aspect of the invention, the invention provides a preparation method of a viscosity-reducing oil washing agent for cold recovery of thickened oil, which comprises the following steps: under the condition of ultraviolet irradiation, 3-mercapto-alkyl-1, 3, 5-heptamethyl trisiloxane and 1- (3-olefine pyridine-2-yl) piperazine are subjected to click reaction in the presence of a catalyst and a solvent.
In the invention, the catalyst is one of benzoin dimethyl ether, 2,4,6 (trimethylbenzoyl) diphenyl phosphine oxide, 1-hydroxy-cyclohexyl-phenyl ketone and benzophenone; the structure of the 3-mercaptoalkyl-1, 3, 5-heptamethyltrisiloxane is shown as a formula (1), and the structure of the 1- (3-olefine pyridine-2-yl) piperazine is shown as a formula (2);
wherein m is a positive integer of 1 to 8; n is a positive integer of 1 to 12.
Preferably, in formula (1), m is 2 or 3.
Preferably, in formula (2), n is 4 or 5.
In the invention, the molar ratio of the 3-mercaptoalkyl-1, 3, 5-heptamethyltrisiloxane to the 1- (3-olefin-based pyridin-2-yl) piperazine is 1:0.5-1.2; preferably, the molar ratio of the 3-mercaptoalkyl-1, 3, 5-heptamethyltrisiloxane to the 1- (3-olefinopyridin-2-yl) piperazine is 1:0.8-1.1; more preferably, the molar ratio of 3-mercaptoalkyl-1, 3, 5-heptamethyltrisiloxane to 1- (3-alkenylpyridin-2-yl) piperazine is 1:0.95-1.
Preferably, the catalyst is benzoin dimethyl ether or benzophenone.
In the invention, the dosage of the catalyst is 0.01 to 0.2 percent of the mass of the 3-mercaptoalkyl-1, 3, 5-heptamethyltrisiloxane; preferably, the catalyst is used in an amount of 0.05 to 0.1% by mass of 3-mercaptoalkyl-1, 3, 5-heptamethyltrisiloxane.
In the invention, the solvent is one or a mixture of deionized water and ethanol in any proportion.
In the invention, the solvent is 3-8 times of the mass of the 3-mercaptoalkyl-1, 3, 5-heptamethyltrisiloxane; preferably, the solvent is used in an amount of 4 to 6 times the mass of 3-mercaptoalkyl-1, 3, 5-heptamethyltrisiloxane.
According to a more specific preferred embodiment, the preparation method of the viscosity-reducing oil washing agent for cold recovery of thick oil specifically comprises the following steps:
(1) Adding 3-mercaptoalkyl-1, 3, 5-heptamethyltrisiloxane and 1- (3-olefinopyridin-2-yl) piperazine into a single-neck flask with a stirrer, then adding a solvent, regulating the stirring speed to 300-900 rpm, adding a catalyst after complete dissolution, irradiating ultraviolet light, and controlling the time to be 30-80 min to obtain a viscosity reduction oil washing agent solution;
(2) And removing the solvent from the viscosity-reducing oil-washing agent solution by using a rotary evaporator, extracting for 3-8 times by using a mixed solution of methanol and n-hexane, removing the extractant by using the rotary evaporator again, and placing the extract in a vacuum drying oven for 8-24 hours to obtain the viscosity-reducing oil-washing agent.
In the step (2), the mass ratio of the methanol-n-hexane mixed solution is 1:0.1-0.3, and the total dosage is 1-6 times of the mass of the 3-mercaptoalkyl-1, 3, 5-heptamethyltrisiloxane.
The viscosity reduction oil washing agent synthesis reaction equation is as follows:
According to a second aspect of the invention, the invention provides the viscosity reduction wash oil agent prepared by the preparation method according to the first aspect of the invention, wherein the viscosity reduction wash oil agent has a structure shown in a formula (3):
Wherein:
m is a positive integer from 1 to 8, preferably m=2 or 3;
n is a positive integer of 1 to 12, preferably n=4 or 5.
According to a third aspect of the invention, the invention provides the use of the viscosity-reducing oil wash of the second aspect of the invention in cold recovery of heavy oil. The method is particularly suitable for application in low-efficiency water flooding and multi-round huff and puff heavy oil reservoirs.
In the invention, the applied oil reservoir temperature is less than 90 ℃, the crude oil viscosity is less than 15000 mPa.s, and the clay content is less than 25% of the strong water-sensitive oil reservoir.
In the invention, the viscosity reduction oil washing agent is used at a concentration of not less than 500mg/L.
The invention will be further illustrated with reference to specific examples.
In the present invention, the devices or apparatus used are all conventional devices or apparatus known in the art, and are commercially available.
In the following examples and comparative examples, each reagent used was a chemically pure reagent from commercial sources, unless otherwise specified.
Example 1
(1) 1Mol of 3-mercaptomethyl-1, 3, 5-heptamethyltrisiloxane and 0.5mol of 1- (3-allylpyridin-2-yl) piperazine are added into a single-neck flask with a stirrer, 805g of solvent deionized water is then added, the stirring speed is adjusted to 300rpm, after complete dissolution, 0.027g of catalyst benzoin dimethyl ether is added, and ultraviolet light is irradiated for 30min, thus obtaining viscosity reduction oil washing agent solution;
(2) And removing the solvent deionized water from the viscosity reducing oil washing agent solution by using a rotary evaporator, extracting for 3 times by using 268g of mixed solution of methanol and n-hexane, wherein the mass ratio of the mixed solution of methanol and n-hexane is 1:0.1, removing the extractant by using the rotary evaporator again, and placing the solution in a vacuum drying box for 8 hours to obtain the viscosity reducing oil washing agent C 1.
Example 2
(1) 1Mol of 3-mercaptoethyl-1, 3, 5-heptamethyltrisiloxane and 0.6mol of 1- (3-butylpyridin-2-yl) piperazine were added into a single-neck flask equipped with a stirrer, then 1412g of solvent ethanol was added, the stirring rate was adjusted to 500rpm, after complete dissolution, 0.056g of catalyst benzophenone was added, and ultraviolet light was irradiated for 50 minutes to obtain a viscosity-reducing oil-washing agent solution;
(2) Removing solvent ethanol from the viscosity-reducing oil-washing agent solution by using a rotary evaporator, extracting for 5 times by using 564g of mixed solution of methanol and normal hexane, wherein the mass ratio of the mixed solution of methanol and normal hexane is 1:0.15, removing the extractant by using the rotary evaporator again, and placing the mixture in a vacuum drying oven for 10 hours to obtain the viscosity-reducing oil-washing agent C 2.
Example 3
(1) 1Mol of 3-mercaptopropyl-1, 3, 5-heptamethyltrisiloxane and 0.7mol of 1- (3-pentylpyridin-2-yl) piperazine are added into a single-neck flask with a stirrer, 2144g of solvent deionized water is then added, the stirring speed is regulated to 600rpm, after complete dissolution, 0.148g of catalyst benzoin dimethyl ether is added, and ultraviolet light is irradiated for 60min, so that a viscosity reduction oil washing agent solution is obtained;
(2) Removing solvent deionized water from the viscosity-reducing oil-washing agent solution by using a rotary evaporator, extracting for 3 times by using 888g of mixed solution of methanol and n-hexane, wherein the mass ratio of the mixed solution of methanol and n-hexane is 1:0.12, removing the extractant by using the rotary evaporator again, and placing the solution in a vacuum drying oven for 12 hours to obtain the viscosity-reducing oil-washing agent C 3.
Example 4
(1) 1Mol of 3-mercaptopropyl-1, 3, 5-heptamethyltrisiloxane and 0.8mol of 1- (3-cycloheptylpyridin-2-yl) piperazine (n is 5) are added into a single-neck flask with a stirrer, 1185g of solvent ethanol is then added, the stirring speed is regulated to 700rpm, after complete dissolution, 0.237g of catalyst benzophenone is added, and ultraviolet light is irradiated for 80min, so as to obtain a viscosity reduction oil washing agent solution;
(2) Removing solvent ethanol from the viscosity-reducing oil-washing agent solution by using a rotary evaporator, extracting for 5 times by using 1480g of mixed solution of methanol and n-hexane, wherein the mass ratio of the mixed solution of methanol and n-hexane is 1:0.18, removing the extractant by using the rotary evaporator again, and placing the mixture in a vacuum drying oven for 16 hours to obtain the viscosity-reducing oil-washing agent C 4.
Example 5
(1) 1Mol of 3-mercaptopentyl-1, 3, 5-heptamethyltrisiloxane and 0.9mol of 1- (3-alkenyloctylpyridin-2-yl) piperazine (n is 6) are added into a single-neck flask with a stirrer, 1946g of deionized water as a solvent is added, the stirring speed is regulated to 800rpm, after complete dissolution, 0.324g of benzoin dimethyl ether as a catalyst is added, ultraviolet light is irradiated, and the time is controlled to 60min, so that a viscosity reduction oil washing agent solution is obtained;
(2) Removing solvent deionized water from the viscosity-reducing oil-washing agent solution by using a rotary evaporator, extracting for 6 times by using 1608g of mixed solution of methanol and n-hexane, wherein the mass ratio of the mixed solution of methanol and n-hexane is 1:0.2, removing the extractant by using the rotary evaporator again, and placing in a vacuum drying oven for 15 hours to obtain the viscosity-reducing oil-washing agent C 5.
Example 6
(1) 1Mol of 3-mercaptoalkyl-1, 3, 5-heptamethyltrisiloxane and 1.0mol of 1- (3-olefinopyridin-2-yl) piperazine (n is 6) are added into a single-neck flask with a stirrer, 1692g of solvent ethanol is added, stirring speed is adjusted to 500rpm, after complete dissolution, 0.406g of catalyst benzophenone is added, ultraviolet light is irradiated, and time is controlled to 50min, thus obtaining viscosity reduction oil washing agent solution;
(2) Removing solvent ethanol from the viscosity-reducing oil-washing agent solution by using a rotary evaporator, extracting for 6 times by using 1290g of mixed solution of methanol and n-hexane, wherein the mass ratio of the mixed solution of methanol and n-hexane is 1:0.25, removing the extractant by using the rotary evaporator again, and placing the mixture in a vacuum drying oven for 18 hours to obtain the viscosity-reducing oil-washing agent C 6.
Example 7
(1) 1Mol of 3-mercaptoalkyl-1, 3, 5-heptamethyltrisiloxane and 1.1mol of 1- (3-dodecenyl) pyridin-2-yl) piperazine are added into a single-neck flask with a stirrer, 1467g of solvent deionized water is then added, the stirring speed is adjusted to 800rpm, after complete dissolution, 0.528g of catalyst benzoin dimethyl ether is added, and ultraviolet light is irradiated for 70min, so as to obtain viscosity reduction oil washing agent solution;
(2) And removing the solvent deionized water from the viscosity reducing oil washing agent solution by using a rotary evaporator, extracting for 8 times by using 1408g of mixed solution of methanol and normal hexane, wherein the mass ratio of the mixed solution of methanol and normal hexane is 1:0.27, removing the extractant by using the rotary evaporator again, and placing the solution in a vacuum drying oven for 20 hours to obtain the viscosity reducing oil washing agent C 7.
Example 8
(1) 1Mol of 3-mercaptooctyl-1, 3, 5-heptamethyltrisiloxane and 1.2mol of 1- (3-tetradecylpyridin-2-yl) piperazine are added into a single-neck flask with a stirrer, 1198g of solvent ethanol is then added, the stirring speed is adjusted to 900rpm, after complete dissolution, 0.732g of catalyst benzophenone is added, ultraviolet light is irradiated, the time is controlled to 80 minutes, and a viscosity reduction oil-washing agent solution is obtained;
(2) Removing solvent ethanol from the viscosity-reducing oil-washing agent solution by using a rotary evaporator, extracting for 8 times by using 2196g of mixed solution of methanol and normal hexane, wherein the mass ratio of the mixed solution of methanol and normal hexane is 1:0.3, removing the extractant by using the rotary evaporator again, and placing the mixture in a vacuum drying oven for 24 hours to obtain the viscosity-reducing oil-washing agent C 8.
Test example 1 evaluation of static viscosity reduction Rate, oil washing Rate, salt tolerance
The experiment is aimed at thick oil M in a certain block of a victory oil field, the oil reservoir temperature is 50 ℃, the ground crude oil viscosity is 11943 mPa.s at 50 ℃, the emulsified water content is 38.3% and the mineralization degree of injected water is 202391mg/L, and the calcium and magnesium ion concentration is 1036mg/L. The viscosity reduction oil washing agent C 1～C8 and the commercial water-soluble viscosity reducer products S 1 (purchase enterprises: shaoxing Shao Yu Mo organic chemistry institute) and S 2 (purchase enterprises: shandong Shengli chemical Co., ltd.) of the embodiment of the invention are respectively adopted to evaluate the viscosity reduction and the oil washing effect of the thick oil and the salt tolerance of the viscosity reduction oil washing agent.
The method for measuring the viscosity reduction rate of the viscosity reducer refers to Q/SH 102041519-2016 general technical condition of viscosity reducer for heavy oil. Static wash oil rate is tested according to the method 7.11 in the general technical condition of the Q/SH 102022871-2021 thick oil viscosity-reducing oil displacement agent, and the test results are shown in Table 1.
TABLE 1 viscosity reduction wash C 1-C8 and S 1-S2 test results
The test results show that: the viscosity reduction oil washing agent has a static viscosity reduction effect and a static wash oil rate which are superior to those of the commercially available water-soluble viscosity reducer, the viscosity reduction rate of the viscosity reduction oil washing agent is more than 98.5% under the conditions of 500mg/L concentration and 50 ℃, the viscosity of emulsion after viscosity reduction is less than 150 mPa.s, dispersed emulsion particles are uniformly dispersed, and the viscosity reduction rate of S 1 and S 2 is lower than 93%; the static wash oil rate reaches more than 50%, wherein the static wash oil rate of C 3 reaches more than 60%, and the static wash oil rates of S 1 and S 2 are lower than 44%. Meanwhile, the mineral water-based paint has excellent salt resistance, and the mineralization resistance reaches over 200000 mg/L. The viscosity-reducing oil washing agent disclosed by the invention completely meets the development requirements of thickened oil cold recovery.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of the individual technical features in any other suitable way, which simple variants and combinations should likewise be regarded as being disclosed by the invention, all falling within the scope of protection of the invention.
Claims (17)
1. The preparation method of the viscosity-reducing oil washing agent for cold recovery of the thickened oil is characterized by comprising the following steps of: under the condition of ultraviolet irradiation, 3-mercapto-1, 3, 5-heptamethyl trisiloxane and 1- (3-olefine pyridine-2-yl) piperazine undergo a click reaction in the presence of a catalyst and a solvent, wherein the catalyst is one of benzoin dimethyl ether, 2,4,6 (trimethyl benzoyl) diphenyl phosphine oxide, 1-hydroxy-cyclohexyl-phenyl ketone and benzophenone; the structure of the 3-mercaptoalkyl-1, 3, 5-heptamethyltrisiloxane is shown as a formula (1), and the structure of the 1- (3-olefine pyridine-2-yl) piperazine is shown as a formula (2);
wherein m is a positive integer of 1 to 8; n is a positive integer of 1 to 12.
2. The method for preparing a viscosity-reducing wash oil for cold recovery of thickened oil according to claim 1, wherein m in formula (1) is 2 or 3.
3. The method for preparing a viscosity-reducing wash oil for cold recovery of thickened oil according to claim 1, wherein n in formula (2) is 4 or 5.
4. The method for preparing the viscosity-reducing oil washing agent for cold recovery of thick oil according to claim 1, wherein the molar ratio of 3-mercaptoalkyl-1, 3, 5-heptamethyltrisiloxane to 1- (3-olefinopyridin-2-yl) piperazine is 1:0.5-1.2.
5. The method for preparing a viscosity-reducing oil washing agent for cold recovery of thickened oil according to claim 4, wherein the molar ratio of 3-mercapto-1, 3, 5-heptamethyltrisiloxane to 1- (3-olefinopyridin-2-yl) piperazine is 1:0.8-1.1.
6. The method for preparing a viscosity-reducing oil wash for cold recovery of thickened oil according to claim 5, wherein the molar ratio of 3-mercapto-1, 3, 5-heptamethyltrisiloxane to 1- (3-olefinopyridin-2-yl) piperazine is 1:0.95-1.
7. The method for preparing a viscosity-reducing wash oil for cold recovery of thickened oil according to claim 1, wherein the catalyst is benzoin dimethyl ether or benzophenone.
8. The method for preparing a viscosity-reducing wash oil for cold recovery of thickened oil according to claim 1 or 7, characterized in that the catalyst is used in an amount of 0.01 to 0.2% by mass of 3-mercaptoalkyl-1, 3, 5-heptamethyltrisiloxane.
9. The method for preparing a viscosity-reducing oil washing agent for cold recovery of thickened oil according to claim 8, wherein the catalyst is used in an amount of 0.05 to 0.1% by mass of 3-mercaptoalkyl-1, 3, 5-heptamethyltrisiloxane.
10. The method for preparing the viscosity-reducing oil washing agent for cold recovery of thick oil according to claim 1, wherein the solvent is one or a mixture of deionized water and ethanol in any proportion.
11. The method for preparing the viscosity-reducing oil washing agent for cold recovery of thick oil according to claim 1, wherein the solvent is 3-8 times of the mass of 3-mercaptoalkyl-1, 3, 5-heptamethyltrisiloxane.
12. The method for preparing a viscosity-reducing oil washing agent for cold recovery of thickened oil according to claim 11, wherein the solvent is used in an amount of 4 to 6 times the mass of 3-mercaptoalkyl-1, 3, 5-heptamethyltrisiloxane.
13. The viscosity-reducing oil washing agent for cold recovery of thick oil is characterized by having a structure shown in a formula (3):
Wherein:
m is a positive integer of 1 to 8;
n is a positive integer of 1 to 12.
14. The use of the viscosity reducing wash of claim 13 in cold recovery of heavy oil.
15. The use of claim 14, wherein the use is in an inefficient water flooding and multiple round trip heavy oil reservoir.
16. The use according to claim 14 or 15, wherein the use has a reservoir temperature of less than 90 ℃, a crude oil viscosity of less than 15000 mPa-s, and a clay content of less than 25%.
17. The use according to claim 14, wherein the viscosity reducing wash is used at a concentration of not less than 500mg/L.
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