CN112961664A - High-efficiency oil displacement surfactant for oil field - Google Patents
High-efficiency oil displacement surfactant for oil field Download PDFInfo
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- CN112961664A CN112961664A CN202110206319.XA CN202110206319A CN112961664A CN 112961664 A CN112961664 A CN 112961664A CN 202110206319 A CN202110206319 A CN 202110206319A CN 112961664 A CN112961664 A CN 112961664A
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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
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/602—Compositions for stimulating production by acting on the underground formation containing surfactants
- C09K8/604—Polymeric surfactants
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- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
Abstract
The invention relates to the technical field of active agents, and discloses an efficient oil-displacing surfactant for oil fields, which comprises the following raw materials in parts by weight: 1-2% of gemini silicone surfactant, 1-3% of polyoxyethylene sorbitan monooleate, 2-4% of chelating agent, 2-3% of biological acid, 5-8% of scale inhibitor, 1-2% of macromolecular foam stabilizer and 60-70% of water. The oil field is with high-efficient displacement of reservoir oil type surfactant, through the oil field with high-efficient displacement of reservoir oil type surfactant, inject it into the back during use, thereby can effectively prevent in the oil field because formation water and storage rock are incompatible and can cause the injury to the reservoir, effectively prevent that metal ion from deposiing and causing the injury to the formation, because the wettability dispersibility of itself is strong, the oil washing efficiency is high, the problem that the water injection well ability diffusion is slow, oil well oil production is low has been solved well, can play the effect that reduces water injection pressure, increase water injection volume, improve displacement of reservoir oil efficiency effectively.
Description
Technical Field
The invention relates to the technical field of active agents, in particular to an efficient oil-displacing surfactant for oil fields.
Background
In tertiary oil recovery, binary combination flooding is an oil displacement technology which effectively utilizes the viscosity of a polymer and the activity of an active agent, compared with single polymer injection, the binary combination flooding can more effectively obtain the effects of precipitation and oil increment, the recovery ratio is greatly improved, the scale of oil field combination flooding projects is enlarged year by year, the oil displacement effect is gradually shown, and the active agent plays an important role in increasing the oil washing efficiency as one of important components in combination flooding.
Because the geological conditions of oil reservoirs in different blocks are greatly different, active agents suitable for compound flooding in different blocks need to be researched, when the injected water salinity is lower than the formation water salinity, and the chemical components are incompatible with the clay minerals in the reservoir, will cause the hydration expansion and dispersion of clay mineral, lead to the reduction of reservoir permeability, form water sensitivity damage, and lead to the blockage of solid phase to the reservoir throat, thus leading to the reduction of effective permeability, when reservoir fluid and external fluid are incompatible, organic precipitates or inorganic precipitates are generated, the precipitates are adsorbed on the surface of rock to form scales, reduce pore passages or block a flow passage along with the migration of liquid flow, so that the reservoir is seriously damaged, and common precipitates comprise calcium carbonate, barium sulfate, ferric hydroxide and calcium sulfate, and have compact lithology, low permeability and interface action to further increase the seepage resistance of oil and water.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the high-efficiency oil-displacing surfactant for the oil field, which has the advantages of strong chemical system performance, good compatibility, capability of being applied in combination with other chemical oil-displacing agents, improvement on the recovery rate of crude oil, no scaling and capability of solving the problems in the background art.
The invention provides the following technical scheme: the efficient oil displacement surfactant for the oil field comprises the following raw materials in percentage by weight: 1-2% of gemini type organic silicon surfactant, 1-3% of polyoxyethylene sorbitan monooleate, 2-4% of chelating agent, 2-3% of biological acid, 5-8% of scale inhibitor, 1-2% of macromolecular foam stabilizer and 60-70% of water, wherein the oil is C7-C9 normal alkane and is selected according to the principle that the equivalent alkane carbon number of crude oil is equal, and the gemini type organic silicon surfactant is composed of one or more than two compounds.
Preferably, the preparation steps of the efficient oil displacement surfactant for the oil field are as follows:
adding polyoxyethylene sorbitan monooleate into a reaction kettle, and placing the polyoxyethylene sorbitan monooleate into nitrogen air at 80 ℃ for purging for 30 min;
adding a Gemini organic silicon surfactant, polyoxyethylene sorbitan monooleate and a chelating agent into a reaction kettle, stirring and mixing uniformly, raising the temperature of the reaction kettle to 140 ℃ while stirring, then adding a macromolecular foam stabilizer into the reaction kettle at a stirring speed of 300-480 r/min, and keeping the temperature in the reaction kettle to 150 ℃ to obtain a mixed solution;
adding the biological acid into the mixed solution, stirring and heating for refluxing for 3 hours, after the reaction is finished, naturally cooling the reaction kettle to room temperature, performing suction filtration on the reaction kettle, washing, purifying the obtained solid substance, and storing for later use;
step four, placing the solid matter obtained in the step three into a reaction kettle, adding a foaming agent and a proper amount of water into the reaction kettle, stirring and dissolving the mixed phase formed by the foaming agent and the proper amount of water at room temperature, raising the temperature in the reaction kettle to 60 ℃, and carrying out constant-temperature reaction on the mixed phase for 1 hour to obtain a mixed solution;
and step five, adding the scale inhibitor into the mixed liquid obtained in the step four, mixing and stirring uniformly under the heating condition, then evaporating the solvent in the reaction kettle to dryness, washing the product in the reaction kettle with an organic solvent, filtering and drying the obtained substance, extracting with absolute ethyl alcohol, and drying to obtain the high-efficiency oil-displacing type surfactant.
Preferably, the gemini silicone surfactant is trimethoxy silicon-based gemini silicone surfactant, glucose amide organosilicon gemini surfactant or quaternary ammonium salt gemini silicone surfactant, and the chelating agent is methacryloyl ethyl betaine or citric acid.
Preferably, the Gemini type organosilicon surfactant is trimethoxysilyl Gemini type organosilicon surfactant or glucose amide organosilicon gemini surfactant.
Preferably, the biological acid is a vegetable acid, and the scale inhibitor is polymethacrylic acid or polyacrylic acid.
Preferably, the content of the amphoteric surfactant is 1-3%, the content of the macromolecular foam stabilizer is 1-2%, and the balance is water.
Compared with the prior art, the invention has the following beneficial effects:
the efficient oil displacement surfactant for the oil field can effectively prevent formation water from being incompatible with stored rocks in the oil field to damage a reservoir and effectively prevent metal ions from precipitating to damage the formation after being injected into the surfactant for use, has strong wettability and dispersibility and high oil washing efficiency, well solves the problems of slow diffusion of water injection well capacity and low oil production of an oil well, can play a role in reducing water injection pressure and increasing water injection amount, effectively improves oil displacement efficiency, effectively reduces oil extraction cost, has no toxicity, no harm to the formation and good compatibility, and can be applied with other chemical oil displacement agents in a composite way to greatly improve the recovery ratio.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The efficient oil displacement surfactant for the oil field comprises the following raw materials in parts by weight: 1-2% of gemini organosilicon surfactant, 1-3% of polyoxyethylene sorbitan monooleate, 2-4% of chelating agent, 2-3% of biological acid, 5-8% of scale inhibitor, 1-2% of macromolecular foam stabilizer and 60-70% of water, wherein the oil is normal paraffin of C7-C9 and is selected according to the principle of equivalent alkane carbon number of crude oil, the gemini organosilicon surfactant is composed of one or more than two compounds, the gemini organosilicon surfactant is trimethoxy silicon-based gemini organosilicon surfactant, glucosamido organosilicon gemini surfactant and quaternary ammonium salt gemini organosilicon surfactant, the chelating agent is methacryloyl ethyl betaine or citric acid, the gemini organosilicon surfactant is trimethoxy silicon-based gemini organosilicon surfactant and glucosamido organosilicon gemini surfactant, the biological acid is plant acid, the scale inhibitor is polymethacrylic acid or polyacrylic acid, the content of the amphoteric surfactant is 1-3%, the content of the macromolecular foam stabilizer is 1-2%, and the balance is water, and the preparation steps of the efficient oil displacement surfactant for the oil field are as follows:
adding polyoxyethylene sorbitan monooleate into a reaction kettle, and placing the polyoxyethylene sorbitan monooleate into nitrogen air at 80 ℃ for purging for 30 min;
adding a Gemini organic silicon surfactant, polyoxyethylene sorbitan monooleate and a chelating agent into a reaction kettle, stirring and mixing uniformly, raising the temperature of the reaction kettle to 140 ℃ while stirring, then adding a macromolecular foam stabilizer into the reaction kettle at a stirring speed of 300-480 r/min, and keeping the temperature in the reaction kettle to 150 ℃ to obtain a mixed solution;
adding the biological acid into the mixed solution, stirring and heating for refluxing for 3 hours, after the reaction is finished, naturally cooling the reaction kettle to room temperature, performing suction filtration on the reaction kettle, washing, purifying the obtained solid substance, and storing for later use;
step four, placing the solid matter obtained in the step three into a reaction kettle, adding a foaming agent and a proper amount of water into the reaction kettle, stirring and dissolving the mixed phase formed by the foaming agent and the proper amount of water at room temperature, raising the temperature in the reaction kettle to 60 ℃, and carrying out constant-temperature reaction on the mixed phase for 1 hour to obtain a mixed solution;
and step five, adding the scale inhibitor into the mixed liquid obtained in the step four, mixing and stirring uniformly under the heating condition, then evaporating the solvent in the reaction kettle to dryness, washing the product in the reaction kettle with an organic solvent, filtering and drying the obtained substance, extracting with absolute ethyl alcohol, and drying to obtain the high-efficiency oil-displacing surfactant.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The oil displacement type surfactant for the oil field is characterized in that: comprises the following raw materials in percentage by weight: 1-2% of gemini type organic silicon surfactant, 1-3% of polyoxyethylene sorbitan monooleate, 2-4% of chelating agent, 2-3% of biological acid, 5-8% of scale inhibitor, 1-2% of macromolecular foam stabilizer and 60-70% of water, wherein the oil is C7-C9 normal alkane and is selected according to the principle that the equivalent alkane carbon number of crude oil is equal, and the gemini type organic silicon surfactant is composed of one or more than two compounds.
2. The oil-displacing surfactant for oil field of claim 1, which is characterized in that: the preparation method of the efficient oil displacement surfactant for the oil field comprises the following steps:
adding polyoxyethylene sorbitan monooleate into a reaction kettle, and placing the polyoxyethylene sorbitan monooleate into nitrogen air at 80 ℃ for purging for 30 min;
adding a Gemini organic silicon surfactant, polyoxyethylene sorbitan monooleate and a chelating agent into a reaction kettle, stirring and mixing uniformly, raising the temperature of the reaction kettle to 140 ℃ while stirring, then adding a macromolecular foam stabilizer into the reaction kettle at a stirring speed of 300-480 r/min, and keeping the temperature in the reaction kettle to 150 ℃ to obtain a mixed solution;
adding the biological acid into the mixed solution, stirring and heating for refluxing for 3 hours, after the reaction is finished, naturally cooling the reaction kettle to room temperature, performing suction filtration on the reaction kettle, washing, purifying the obtained solid substance, and storing for later use;
step four, placing the solid matter obtained in the step three into a reaction kettle, adding a foaming agent and a proper amount of water into the reaction kettle, stirring and dissolving the mixed phase formed by the foaming agent and the proper amount of water at room temperature, raising the temperature in the reaction kettle to 60 ℃, and carrying out constant-temperature reaction on the mixed phase for 1 hour to obtain a mixed solution;
and step five, adding the scale inhibitor into the mixed liquid obtained in the step four, mixing and stirring uniformly under the heating condition, then evaporating the solvent in the reaction kettle to dryness, washing the product in the reaction kettle with an organic solvent, filtering and drying the obtained substance, extracting with absolute ethyl alcohol, and drying to obtain the efficient oil displacement surfactant.
3. The oil-displacing surfactant for oil field of claim 1, which is characterized in that: the Gemini type organic silicon surfactant is trimethoxy silicon-based Gemini type organic silicon surfactant, glucose amide organic silicon Gemini surfactant and quaternary ammonium salt Gemini type organic silicon surfactant, and the chelating agent is methacryloyl ethyl betaine or citric acid.
4. The oil-displacing surfactant for oil field of claim 1, which is characterized in that: the Gemini type organosilicon surfactant is trimethoxy silicon-based Gemini type organosilicon surfactant and glucose amide organosilicon gemini surfactant.
5. The oil-displacing surfactant for oil field of claim 1, which is characterized in that: the biological acid is vegetable acid, and the scale inhibitor is polymethacrylic acid or polyacrylic acid.
6. The oil-displacing surfactant for oil field of claim 1, which is characterized in that: the content of the amphoteric surfactant is 1-3%, the content of the macromolecular foam stabilizer is 1-2%, and the balance is water.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110206319.XA CN112961664A (en) | 2021-02-24 | 2021-02-24 | High-efficiency oil displacement surfactant for oil field |
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| CN202110206319.XA CN112961664A (en) | 2021-02-24 | 2021-02-24 | High-efficiency oil displacement surfactant for oil field |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109762548A (en) * | 2019-03-05 | 2019-05-17 | 西安市轻工业研究所 | A kind of increasing injection oil displacement agent of the low permeability oil field containing Gemini surface active agent |
| CN110055045A (en) * | 2019-04-26 | 2019-07-26 | 中国石油化工股份有限公司 | A kind of low poly-cationic quaternary surfactant Synergistic type oil displacement agent |
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2021
- 2021-02-24 CN CN202110206319.XA patent/CN112961664A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109762548A (en) * | 2019-03-05 | 2019-05-17 | 西安市轻工业研究所 | A kind of increasing injection oil displacement agent of the low permeability oil field containing Gemini surface active agent |
| CN110055045A (en) * | 2019-04-26 | 2019-07-26 | 中国石油化工股份有限公司 | A kind of low poly-cationic quaternary surfactant Synergistic type oil displacement agent |
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