CN111087506A - Preparation of nano microemulsion and application of nano microemulsion in improving gas production rate of gas field - Google Patents
Preparation of nano microemulsion and application of nano microemulsion in improving gas production rate of gas field Download PDFInfo
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Abstract
The invention relates to the technical field of oil and gas exploitation, in particular to preparation of nano microemulsion and application of the nano microemulsion in improving gas production rate of a gas field. The nano microemulsion comprises the following components: 35-55 parts of an oily solvent, 20-40 parts of a water-soluble monomer, 5-10 parts of a cationic surfactant, 3-6 parts of an anionic-nonionic surfactant, 1-4 parts of a lipophilic emulsifier, 0.5-1.5 parts of a hydrophilic emulsifier and 0.3-0.8 part of a surfactant synergist. The preparation method comprises the following steps: preparing an oil phase, preparing a water phase, mixing the oil phase and the water phase, reacting and the like. The nano microemulsion can form ultralow interfacial tension with oil gas, so that the cohesion between oil gas is effectively overcome, the outflow of oil gas is facilitated, the gas recovery rate of a gas field is greatly improved, and in addition, the microemulsion is not easy to adsorb and elute in the exploitation process of the gas field, the surface activity loss is low, and the oil gas exploitation cost is favorably reduced.
Description
Technical Field
The invention relates to the technical field of oil and gas exploitation, in particular to preparation of nano microemulsion and application of the nano microemulsion in improving gas production rate of a gas field.
Background
With the increase of the world energy demand, the reasonable development and utilization of oil gas have attracted great attention of people, and the requirements on the oil gas production quantity and the oil gas production efficiency are higher and higher. The method realizes the efficient exploitation of oil and gas resources, and has practical significance and important strategic significance for improving the yield of crude oil.
Currently, oil and gas extraction is a process of extracting oil, natural gas, and the like buried in an underground oil reservoir from the ground. The mode of exploiting oil and gas from underground to the ground can be divided into the following steps according to whether the energy is artificially supplemented to the well bore fluid: self-spraying and artificial lifting. The self-spraying is a mode that the energy of an oil layer is sufficient, and the oil can be lifted to the ground by utilizing the energy of the oil layer; if the reservoir is low in energy, the crude oil must be lifted manually from the bottom of the well to the surface by manually adding energy to the wellbore fluid. Generally, some oil fields with insufficient natural energy have no self-spraying capability, and some oil fields have the self-spraying capability, but the self-spraying period is short, only about one year, at most, 3-5 years are not enough, and the production life of one oil field lasts for more than 20-30 years, so most of crude oil in an oil layer is recovered by an artificial lifting mode. The artificial lift oil production comprises: gas lift oil production, sucker rod pump oil production, submersible electric centrifugal pump oil production, hydraulic piston pump oil production, jet pump oil production, and the like.
At present, oil and gas exploitation is mostly concentrated on the aspect of deep water oil and gas exploitation, and the deep water oil and gas exploitation is usually distinguished according to the water depth: the water depth is normal water depth within 400m, the water depth is deep water from 400m to 1500m, and the water depth exceeding 1500m is ultra-deep water. Along with the reduction of the formation pressure of a gas well of the deep water gas field and the increase of water yield, the liquid carrying capacity of the gas well is deteriorated, the yield is sharply reduced, and the gas well is flooded by water and stops spraying when the yield is serious.
Based on the nano microemulsion, the invention provides the nano microemulsion to solve the problems in the prior art, and the nano microemulsion is applied to gas field exploitation to improve the gas production rate of the gas field.
Disclosure of Invention
The invention provides a preparation method of nano microemulsion and application thereof in improving gas production rate of a gas field, the nano microemulsion can form ultralow interfacial tension with oil gas, thereby effectively overcoming cohesion between oil gas and facilitating outflow of oil gas, thereby greatly improving gas production rate of the gas field, and in addition, the microemulsion is not easy to be adsorbed and eluted in the process of gas field exploitation, has low surface activity loss, and is beneficial to reducing oil gas exploitation cost.
In order to achieve the above object, the present invention provides the following technical solutions:
the first aspect of the invention provides a preparation method of nano microemulsion, which comprises the following components in percentage by weight:
(1) 35-55 parts of an oily solvent;
(2) 20-40 parts of water-soluble monomer;
(3) 5-10 parts of a cationic surfactant;
(4) 3-6 parts of an anionic-nonionic surfactant;
(5) 1-4 parts of a lipophilic emulsifier;
(6) 0.5-1.5 parts of hydrophilic emulsifier;
(7) 0.3-0.8 parts of a surfactant synergist;
and the preparation of the nano microemulsion comprises the following steps:
(a) preparing an oil phase: respectively adding the cationic surfactant, the lipophilic emulsifier and the surfactant synergist into the oily solvent, and uniformly stirring to obtain an oil phase;
(b) preparing a water phase: adding a hydrophilic emulsifier into a water-soluble monomer, uniformly stirring to prepare a solution, adding an anionic-nonionic surfactant into the solution, and stirring until the anionic-nonionic surfactant is completely dissolved to obtain a water phase;
(c) and (c) adding the oil phase prepared in the step a into a reactor, heating to 70-90 ℃, then adding the water phase prepared in the step b, uniformly stirring, reacting for 1-3h, and cooling to room temperature to obtain the nano microemulsion.
In a further embodiment of the invention, the nanomicroemulsion comprises the following components in percentage by weight:
(1) 45 parts of an oily solvent;
(2) 30 parts of a water-soluble monomer;
(3) 7.5 parts of a cationic surfactant;
(4) 4.5 parts of an anionic-nonionic surfactant;
(5) 2.5 parts of a lipophilic emulsifier;
(6) 1 part of hydrophilic emulsifier;
(7) 0.6 part of a surface active synergist.
In a further embodiment of the invention, the oily solvent is selected from at least one of a hydrocarbon, preferably a C6-C10 aromatic hydrocarbon, or an ester, preferably a C4-C8 monoester.
In a further embodiment of the present invention, the water-soluble monomer is an anionic monomer, in particular at least one of vinylbenzenesulfonic acid and salts thereof, allylbenzenesulfonic acid and salts thereof, or vinylcarboxylic acid and salts thereof.
In a further embodiment of the present invention, the cationic surfactant is selected from at least one of quaternary ammonium salts or quaternary ammonium bases.
In a further embodiment of the present invention, the anionic-nonionic surfactant is selected from at least one of alkanolamide polyoxyethylene/propylene ether carboxylates or alkanolamide polyoxyethylene/propylene ether sulfonates.
In a further embodiment of the invention, the lipophilic emulsifier is Span60 and/or Span 80.
In a further embodiment of the invention, the hydrophilic emulsifier is Tween80 and/or sodium lauryl sulfate.
In a further embodiment of the invention, the surfactant builder is polyacrylamide.
The second aspect of the invention provides the application of the nano microemulsion prepared by the method in improving the gas production rate of a gas field.
Compared with the prior art, the invention has the following beneficial effects:
(1) the nano microemulsion has a synergistic effect among the components, and can form ultralow interfacial tension with oil gas through the coordination of an oily solvent, a water-soluble monomer, a cationic surfactant, an anionic-nonionic surfactant, a lipophilic emulsifier, a hydrophilic emulsifier and a surfactant synergist, so that the cohesion among the oil gas is effectively overcome, the outflow of the oil gas is facilitated, the gas recovery rate of a gas field is greatly improved, in addition, the microemulsion is not easy to adsorb and elute in the exploitation process of the gas field, the loss of surface activity is low, and the oil gas exploitation cost is reduced;
(2) the microemulsion which is matched with the oil phase and the water phase is used, so that the microemulsion can be better dissolved in oil water, oil-in-water is converted into water-in-oil, the oil-in-water is beneficial to the overflow of oil gas, meanwhile, the added water-soluble monomer is matched with the oily solvent, so that the oily solvent is deeply inserted into the oil water, the oil gas is separated from the water through the volatilization overflow of the oily solvent, and meanwhile, the water-soluble monomer can reduce the adhesion work of the oil gas on the solid surface and is beneficial to the stripping of the oil gas;
(3) according to the invention, through the mutual matching of the cationic surfactant, the anionic-nonionic surfactant, the lipophilic emulsifier and the hydrophilic emulsifier, the aqueous solution and the oil gas can form ultralow interfacial tension, so that the cohesion among the oil gas is effectively overcome, the overflow of the oil gas is facilitated, and the recovery ratio of the oil gas is further improved.
Detailed Description
The present invention is further described below in conjunction with specific examples to enable those skilled in the art to better understand the present invention and to practice it, but the examples are not intended to limit the present invention.
Example 1
The nano microemulsion of the present example is prepared, and comprises the following components by weight percentage:
(1) 35 parts of an oily solvent;
(2) 20 parts of a water-soluble monomer;
(3) 5 parts of a cationic surfactant;
(4) 3 parts of an anionic-nonionic surfactant;
(5) 1 part of lipophilic emulsifier;
(6) 0.5 part of hydrophilic emulsifier;
(7) 0.3 part of a surfactant synergist;
and the preparation of the nano microemulsion comprises the following steps:
(a) preparing an oil phase: respectively adding the cationic surfactant, the lipophilic emulsifier and the surfactant synergist into the oily solvent, and uniformly stirring to obtain an oil phase;
(b) preparing a water phase: adding a hydrophilic emulsifier into a water-soluble monomer, uniformly stirring to prepare a solution, adding an anionic-nonionic surfactant into the solution, and stirring until the anionic-nonionic surfactant is completely dissolved to obtain a water phase;
(c) and (c) adding the oil phase prepared in the step a into a reactor, heating to 70 ℃, then adding the water phase prepared in the step b, uniformly stirring, reacting for 1 hour, and cooling to room temperature to obtain the nano microemulsion.
Wherein the oily solvent is selected from hydrocarbons selected from aromatic hydrocarbons of C6-C10.
Wherein the water-soluble monomer is an anionic monomer, in particular to vinyl benzene sulfonic acid and salts thereof.
Wherein the cationic surfactant is selected from quaternary ammonium salts.
Wherein the anionic-nonionic surfactant is selected from alkanolamide polyoxyethylene/propylene ether carboxylates.
Wherein the lipophilic emulsifier is Span 60.
Wherein the hydrophilic emulsifier is Tween 80.
Wherein the surface active synergist is polyacrylamide.
Example 2
The nano microemulsion of the present example is prepared, and comprises the following components by weight percentage:
(1) 55 parts of an oily solvent;
(2) 40 parts of a water-soluble monomer;
(3) 10 parts of a cationic surfactant;
(4) 6 parts of an anionic-nonionic surfactant;
(5) 4 parts of a lipophilic emulsifier;
(6) 1.5 parts of a hydrophilic emulsifier;
(7) 0.8 part of a surfactant synergist;
and the preparation of the nano microemulsion comprises the following steps:
(a) preparing an oil phase: respectively adding the cationic surfactant, the lipophilic emulsifier and the surfactant synergist into the oily solvent, and uniformly stirring to obtain an oil phase;
(b) preparing a water phase: adding a hydrophilic emulsifier into a water-soluble monomer, uniformly stirring to prepare a solution, adding an anionic-nonionic surfactant into the solution, and stirring until the anionic-nonionic surfactant is completely dissolved to obtain a water phase;
(c) and (c) adding the oil phase prepared in the step a into a reactor, heating to 90 ℃, then adding the water phase prepared in the step b, uniformly stirring, reacting for 3 hours, and cooling to room temperature to obtain the nano microemulsion.
Wherein the oily solvent is selected from esters selected from monoesters of C4-C8.
Wherein the water-soluble monomer is an anionic monomer, in particular to allyl benzene sulfonic acid and salts thereof.
Wherein the cationic surfactant is selected from quaternary ammonium bases.
Wherein the anionic-nonionic surfactant is selected from the group consisting of propylene ether sulfonates.
Wherein the lipophilic emulsifier is Span 80.
Wherein the hydrophilic emulsifier is sodium dodecyl sulfate.
Wherein the surface active synergist is polyacrylamide.
Example 3
The nano microemulsion of the present example is prepared, and comprises the following components by weight percentage:
(1) 45 parts of an oily solvent;
(2) 30 parts of a water-soluble monomer;
(3) 7.5 parts of a cationic surfactant;
(4) 4.5 parts of an anionic-nonionic surfactant;
(5) 2.5 parts of a lipophilic emulsifier;
(6) 1 part of hydrophilic emulsifier;
(7) 0.6 part of a surfactant synergist;
and the preparation of the nano microemulsion comprises the following steps:
(a) preparing an oil phase: respectively adding the cationic surfactant, the lipophilic emulsifier and the surfactant synergist into the oily solvent, and uniformly stirring to obtain an oil phase;
(b) preparing a water phase: adding a hydrophilic emulsifier into a water-soluble monomer, uniformly stirring to prepare a solution, adding an anionic-nonionic surfactant into the solution, and stirring until the anionic-nonionic surfactant is completely dissolved to obtain a water phase;
(c) and (c) adding the oil phase prepared in the step a into a reactor, heating to 80 ℃, then adding the water phase prepared in the step b, uniformly stirring, reacting for 2 hours, and cooling to room temperature to obtain the nano microemulsion.
Wherein the oily solvent is selected from hydrocarbon and ester mixture, preferably, the hydrocarbon is selected from aromatic hydrocarbon of C6-C10, and the ester is selected from monoester of C4-C8.
The water-soluble monomer is an anionic monomer, and specifically is vinyl benzene sulfonic acid and salts thereof and allyl benzene sulfonic acid and salts thereof.
Wherein the cationic surfactant is selected from quaternary ammonium salts and quaternary ammonium bases.
Wherein the anionic-nonionic surfactant is selected from the group consisting of alkanolamide polyoxyethylene/propylene ether carboxylates and alkanolamide polyoxyethylene/propylene ether sulfonates.
Wherein the lipophilic emulsifier is Span60 and Span 80.
Wherein the hydrophilic emulsifier is Tween80 and sodium dodecyl sulfate.
Wherein the surface active synergist is polyacrylamide.
Example 4
The nano microemulsion of the present example is prepared, and comprises the following components by weight percentage:
(1) 40 parts of an oily solvent;
(2) 25 parts of a water-soluble monomer;
(3) 6 parts of a cationic surfactant;
(4) 4 parts of an anionic-nonionic surfactant;
(5) 2 parts of a lipophilic emulsifier;
(6) 0.8 part of hydrophilic emulsifier;
(7) 0.4 parts of a surfactant synergist;
and the preparation of the nano microemulsion comprises the following steps:
(a) preparing an oil phase: respectively adding the cationic surfactant, the lipophilic emulsifier and the surfactant synergist into the oily solvent, and uniformly stirring to obtain an oil phase;
(b) preparing a water phase: adding a hydrophilic emulsifier into a water-soluble monomer, uniformly stirring to prepare a solution, adding an anionic-nonionic surfactant into the solution, and stirring until the anionic-nonionic surfactant is completely dissolved to obtain a water phase;
(c) and (c) adding the oil phase prepared in the step a into a reactor, heating to 75 ℃, then adding the water phase prepared in the step b, stirring uniformly, reacting for 1.5h, and cooling to room temperature to obtain the nano microemulsion.
Wherein, the oily solvent is preferably selected from hydrocarbons, and the hydrocarbons are selected from aromatic hydrocarbons of C6-C10.
The water-soluble monomer is an anionic monomer, and specifically is allyl benzene sulfonic acid and salts thereof and vinyl carboxylic acid and salts thereof.
Wherein the cationic surfactant is selected from quaternary ammonium salts.
Wherein the anionic-nonionic surfactant is selected from alkanolamide polyoxyethylene/propylene ether sulfonates.
Wherein the lipophilic emulsifier is Span 60.
Wherein the hydrophilic emulsifier is Tween 80.
Wherein the surface active synergist is polyacrylamide.
Example 5
The nano microemulsion of the present example is prepared, and comprises the following components by weight percentage:
(1) 50 parts of an oily solvent;
(2) 35 parts of a water-soluble monomer;
(3) 9 parts of a cationic surfactant;
(4) 5 parts of an anionic-nonionic surfactant;
(5) 3 parts of a lipophilic emulsifier;
(6) 1.2 parts of a hydrophilic emulsifier;
(7) 0.7 part of a surfactant synergist;
and the preparation of the nano microemulsion comprises the following steps:
(a) preparing an oil phase: respectively adding the cationic surfactant, the lipophilic emulsifier and the surfactant synergist into the oily solvent, and uniformly stirring to obtain an oil phase;
(b) preparing a water phase: adding a hydrophilic emulsifier into a water-soluble monomer, uniformly stirring to prepare a solution, adding an anionic-nonionic surfactant into the solution, and stirring until the anionic-nonionic surfactant is completely dissolved to obtain a water phase;
(c) and (c) adding the oil phase prepared in the step a into a reactor, heating to 85 ℃, then adding the water phase prepared in the step b, stirring uniformly, reacting for 2.5 hours, and cooling to room temperature to obtain the nano microemulsion.
Wherein the oily solvent is at least one selected from hydrocarbon or ester, preferably, the hydrocarbon is selected from aromatic hydrocarbon of C6-C10, and the ester is selected from monoester of C4-C8.
Wherein the water-soluble monomer is an anionic monomer, in particular vinyl carboxylic acid and salts thereof.
Wherein the cationic surfactant is selected from quaternary ammonium salts and quaternary ammonium bases.
Wherein the anionic-nonionic surfactant is selected from alkanolamide polyoxyethylates and propylene ether carboxylates or alkanolamide polyoxyethylates.
Wherein the lipophilic emulsifier is Span60 and Span 80.
Wherein the hydrophilic emulsifier is sodium dodecyl sulfate.
Wherein the surface active synergist is polyacrylamide.
In conclusion, the main innovation points of the nano microemulsion for oil displacement are as follows:
1. the nano microemulsion has a synergistic effect among the components, and can form ultralow interfacial tension with oil gas through the coordination of an oily solvent, a water-soluble monomer, a cationic surfactant, an anionic-nonionic surfactant, a lipophilic emulsifier, a hydrophilic emulsifier and a surfactant synergist, so that the cohesion among the oil gas is effectively overcome, the outflow of the oil gas is facilitated, the gas recovery rate of a gas field is greatly improved, in addition, the microemulsion is not easy to adsorb and elute in the exploitation process of the gas field, the loss of surface activity is low, and the oil gas exploitation cost is reduced;
2. the microemulsion which is matched with the oil phase and the water phase is used, so that the microemulsion can be better dissolved in oil water, oil-in-water is converted into water-in-oil, the oil-in-water is beneficial to the overflow of oil gas, meanwhile, the added water-soluble monomer is matched with the oily solvent, so that the oily solvent is deeply inserted into the oil water, the oil gas is separated from the water through the volatilization overflow of the oily solvent, and meanwhile, the water-soluble monomer can reduce the adhesion work of the oil gas on the solid surface and is beneficial to the stripping of the oil gas;
3. according to the invention, through the mutual matching of the cationic surfactant, the anionic-nonionic surfactant, the lipophilic emulsifier and the hydrophilic emulsifier, the aqueous solution and the oil gas can form ultralow interfacial tension, so that the cohesion among the oil gas is effectively overcome, the overflow of the oil gas is facilitated, and the recovery ratio of the oil gas is further improved.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. The preparation method of the nano microemulsion is characterized in that the nano microemulsion comprises the following components in percentage by weight:
(1) 35-55 parts of an oily solvent;
(2) 20-40 parts of water-soluble monomer;
(3) 5-10 parts of a cationic surfactant;
(4) 3-6 parts of an anionic-nonionic surfactant;
(5) 1-4 parts of a lipophilic emulsifier;
(6) 0.5-1.5 parts of hydrophilic emulsifier;
(7) 0.3-0.8 parts of a surfactant synergist;
and the preparation of the nano microemulsion comprises the following steps:
(a) preparing an oil phase: respectively adding the cationic surfactant, the lipophilic emulsifier and the surfactant synergist into the oily solvent, and uniformly stirring to obtain an oil phase;
(b) preparing a water phase: adding a hydrophilic emulsifier into a water-soluble monomer, uniformly stirring to prepare a solution, adding an anionic-nonionic surfactant into the solution, and stirring until the anionic-nonionic surfactant is completely dissolved to obtain a water phase;
(c) and (c) adding the oil phase prepared in the step a into a reactor, heating to 70-90 ℃, then adding the water phase prepared in the step b, uniformly stirring, reacting for 1-3h, and cooling to room temperature to obtain the nano microemulsion.
2. The preparation of a nanomicroemulsion according to claim 1, characterized in that it comprises, in percentages by weight, the following components:
(1) 45 parts of an oily solvent;
(2) 30 parts of a water-soluble monomer;
(3) 7.5 parts of a cationic surfactant;
(4) 4.5 parts of an anionic-nonionic surfactant;
(5) 2.5 parts of a lipophilic emulsifier;
(6) 1 part of hydrophilic emulsifier;
(7) 0.6 part of a surface active synergist.
3. The preparation of nanomicroemulsions according to claim 1, characterized in that said oily solvent is selected from at least one of hydrocarbons or esters, preferably said hydrocarbons are selected from aromatic hydrocarbons from C6 to C10, said esters are selected from monoesters of C4 to C8.
4. The preparation of a nanomicroemulsion as claimed in claim 1, wherein the water-soluble monomer is an anionic monomer, in particular at least one of vinylbenzenesulfonic acid and salts thereof, allylbenzenesulfonic acid and salts thereof or vinylcarboxylic acid and salts thereof.
5. The preparation of nanomicroemulsions according to claim 1, characterized in that said cationic surfactant is selected from at least one of quaternary ammonium salts or quaternary ammonium bases.
6. The preparation of a nanomicroemulsion as claimed in claim 1, wherein the anionic-nonionic surfactant is selected from at least one of alkanolamide polyoxy ethyl/propylene ether carboxylates or alkanolamide polyoxy ethyl/propylene ether sulfonates.
7. The preparation of nanomicroemulsions according to claim 1, characterized in that said lipophilic emulsifier is Span60 and/or Span 80.
8. The preparation of nanomicroemulsions according to claim 1, characterized in that said hydrophilic emulsifier is Tween80 and/or sodium lauryl sulfate.
9. The preparation of a nanomicroemulsion as claimed in claim 1, wherein the surfactant synergist is polyacrylamide.
10. Use of the nanomicroemulsion prepared according to the process of any one of claims 1 to 9 for increasing the gas recovery in a gas field.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911302650.0A CN111087506A (en) | 2019-12-17 | 2019-12-17 | Preparation of nano microemulsion and application of nano microemulsion in improving gas production rate of gas field |
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| CN201911302650.0A CN111087506A (en) | 2019-12-17 | 2019-12-17 | Preparation of nano microemulsion and application of nano microemulsion in improving gas production rate of gas field |
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| CN114832865A (en) * | 2022-06-15 | 2022-08-02 | 中国石油大学(华东) | Preparation method of molybdenum-based microemulsion catalyst applied to hydrocracking |
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| CN114832865A (en) * | 2022-06-15 | 2022-08-02 | 中国石油大学(华东) | Preparation method of molybdenum-based microemulsion catalyst applied to hydrocracking |
| CN114832865B (en) * | 2022-06-15 | 2023-08-22 | 中国石油大学(华东) | Preparation method of molybdenum-based microemulsion catalyst applied to hydrocracking |
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