CN106398675B - Emulsification viscosity reducer, preparation method and application thereof, and thick oil emulsification viscosity reduction method - Google Patents
Emulsification viscosity reducer, preparation method and application thereof, and thick oil emulsification viscosity reduction method Download PDFInfo
- Publication number
- CN106398675B CN106398675B CN201510459108.1A CN201510459108A CN106398675B CN 106398675 B CN106398675 B CN 106398675B CN 201510459108 A CN201510459108 A CN 201510459108A CN 106398675 B CN106398675 B CN 106398675B
- Authority
- CN
- China
- Prior art keywords
- viscosity
- viscosity reducer
- thick oil
- emulsification
- alcohol
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
-
- 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
- C09K8/588—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 polymers
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Colloid Chemistry (AREA)
- Lubricants (AREA)
Abstract
The invention relates to the field of emulsification and viscosity reduction, and discloses an emulsification viscosity reducer which contains a cationic surfactant, a nonionic surfactant, alcohol and a high-molecular polymer. Also discloses a preparation method of the emulsifying viscosity reducer and application of the emulsifying viscosity reducer in thick oil emulsifying viscosity reduction. Also discloses a method for emulsifying and reducing the viscosity of the thick oil by adopting the emulsifying viscosity reducer. The emulsifying viscosity reducer can effectively reduce the viscosity of the thick oil, is particularly suitable for the thick oil with high wax content, can also be applied to common thick oil and super thick oil with low wax content, and has excellent adaptability to the thick oil of formation water containing high calcium and magnesium ions.
Description
Technical Field
The invention relates to the field of emulsification and viscosity reduction, in particular to an emulsification viscosity reducer, a preparation method and application of the emulsification viscosity reducer, and a method for emulsifying and reducing viscosity of thick oil by using the emulsification viscosity reducer.
Background
The thickened oil refers to crude oil with viscosity of more than 50mPa.s at 50 ℃. The thick oil has high viscosity, so that the thick oil has poor fluidity, and a plurality of adverse effects are brought to the processes of exploitation, lifting and gathering of the thick oil. The emulsification viscosity reduction is a viscosity reduction method which adopts an additional surfactant to form oil-in-water type emulsion by thickened oil and a surfactant aqueous solution, thereby reducing the viscosity of crude oil and improving the fluidity of thickened oil.
The development of the thickened oil occupies a certain proportion in the development of oil and gas in China, and the thickened oil distribution exists in Liaohe oil field, Shengli oil field, Xinjiang oil field, Central China oil field and Jiangsu oil field. The proportion of the heavy oil production to the whole oil production is also increased. Improving the fluidity of thick oil is a key technology in the processes of thick oil exploitation, lifting and gathering and transportation. The emulsification and viscosity reduction can realize the cold recovery of the thick oil under the condition of low temperature, the shaft lifting and the low-temperature transportation. The emulsification and viscosity reduction have important effects on improving the development effect of the heavy oil reservoir and improving the economic benefit.
CN103320110A discloses a nanometer composite high-temperature resistant extraction aid for thick oil and ultra-thick oil exploitation and a preparation method thereof. The modified nano-scale oil is prepared from a modified nano-inorganic auxiliary agent, petroleum sulfonate, a viscosity reducer, an emulsifier, a surface wetting agent, a penetrating agent, a high-molecular modifier and a catalyst. The main component of the material is nano SiO2Anionic surfactant, nonionic surfactant and high molecular polymer. The viscosity reducer can be used for reducing viscosity of thick oil under the condition of high temperature.
CN102618245A discloses an emulsifying viscosity reducer and application thereof. The viscosity reducer mainly comprises sodium dodecyl sulfate, sulfonate anionic surfactant, alkylbenzene sulfonate anionic surfactant and carboxylate anionic surfactant. The viscosity reducer can realize the emulsification and viscosity reduction of common thick oil and ultra-thick oil under the condition that the mineralization degree is 20000 mg/L.
CN102604618A discloses a viscosity reducer for thick oil cold production formation crude oil, which is applied to treatment of formation crude oil in cold production of thick oil in an oil field and improves the fluidity of the formation crude oil. The viscosity reducer consists of N, N-oleoyl ditallow sodium, sodium lauroyl methyltaurate, sodium secondary alkyl sulfate, emulsifier OPE-12, sodium oleate and sodium hydroxide.
The wax-containing heavy oil is a special type of heavy oil, and the viscosity and the condensation point of the heavy oil are high due to the high content of wax in the heavy oil. Because of the large amount of wax component, the thick oil is difficult to emulsify and reduce viscosity, and is easier to form water-in-oil emulsion. The existing thick oil emulsifying viscosity reducer is mainly composed of an anionic surfactant, a nonionic surfactant, a cosurfactant, a pH value regulator, a polymer and the like. The emulsifying viscosity reducer has good viscosity reducing effect on common thick oil and ultra-thick oil which are suitable, but has poor adaptability to the emulsifying viscosity reduction of the thick oil with high wax content and is not suitable for the emulsifying viscosity reduction of the thick oil containing high calcium and magnesium ion formation water.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a novel emulsification viscosity reducer which is not only suitable for emulsification viscosity reduction of high-wax-content thick oil, but also suitable for emulsification viscosity reduction of common thick oil and ultra-thick oil with low wax content, and has excellent adaptability to thick oil of formation water containing high calcium and magnesium ions.
The inventor of the invention discovers in research that the emulsifying viscosity reducer contains a cationic surfactant, a nonionic surfactant, alcohol and a high molecular polymer, can be applied to emulsifying and viscosity reducing of high-wax-content thick oil, can also be applied to emulsifying and viscosity reducing of common thick oil and ultra-thick oil with low wax content, and has excellent adaptability to thick oil of formation water containing high calcium and magnesium ions.
Accordingly, in order to achieve the above objects, in one aspect, the present invention provides an emulsification viscosity reducer comprising a cationic surfactant, a nonionic surfactant, an alcohol, and a high molecular polymer.
Preferably, the emulsifying viscosity reducer also contains water.
Preferably, based on the weight of the emulsification viscosity reducer, the content of the cationic surfactant is 0.05-5 wt%, the content of the nonionic surfactant is 0.01-1 wt%, the content of the alcohol is 0.01-0.2 wt%, the content of the high molecular polymer is 0.01-1 wt%, and the balance is water; more preferably, based on the weight of the emulsification viscosity reducer, the content of the cationic surfactant is 0.1-0.8 wt%, the content of the nonionic surfactant is 0.05-0.2 wt%, the content of the alcohol is 0.05-0.1 wt%, the content of the high molecular polymer is 0.05-0.2 wt%, and the balance is water.
Preferably, the cationic surfactant is alkyl trimethyl ammonium chloride and/or alkyl trimethyl ammonium bromide, and the number of carbon atoms of the alkyl is 3-20, more preferably 12-18; the cationic surfactant is more preferably at least one of dodecyltrimethylammine chloride, tetradecyltrimethylamine chloride, hexadecyltrimethylammine chloride and octadecyltrimethylamine chloride.
Preferably, the nonionic surfactant is at least one of alkylphenol polyoxyethylene ether, alkylphenol polyoxypropylene ether, fatty alcohol polyoxyethylene ether and fatty alcohol polyoxypropylene ether. The number of carbon atoms of the alkyl group of the alkylphenol polyoxyethylene ether or alkylphenol polyoxypropylene ether is preferably 5 to 15, more preferably 7 to 10, and the degree of polymerization of the polyoxyethylene of the alkylphenol polyoxyethylene ether or polyoxypropylene of the alkylphenol polyoxypropylene ether is preferably 5 to 20, more preferably 7 to 15; the number of carbon atoms of the alkyl group of the fatty alcohol-polyoxyethylene ether or fatty alcohol-polyoxypropylene ether is preferably 5 to 20, more preferably 8 to 14, and the degree of polymerization of the polyoxyethylene of the fatty alcohol-polyoxyethylene ether or polyoxypropylene of the fatty alcohol-polyoxypropylene ether is preferably 3 to 20, more preferably 7 to 15.
Preferably, the alcohol is a monohydric alcohol having from 1 to 12 carbon atoms, more preferably from 2 to 6 carbon atoms, and even more preferably ethanol and/or butanol.
Preferably, the high molecular polymer is at least one of polyacrylamide, xanthan gum, carboxymethyl cellulose, scleroglucan and polyvinyl alcohol. The viscosity average molecular weight of the polyacrylamide is preferably 500X 104-3000×104。
Preferably, the degree of mineralization of said water is between 0 and 25X 104mg/L, calcium and magnesium ion content of 0-2 × 104mg/L。
In a second aspect, the present invention provides a method for preparing the emulsifying viscosity reducer, which comprises: the cationic surfactant, the nonionic surfactant, the alcohol and the high molecular polymer are completely dissolved in water.
Preferably, the dissolving comprises: under the condition of stirring, adding the high molecular polymer into partial water, stirring until the high molecular polymer is fully dissolved, then adding the cationic surfactant, the nonionic surfactant and the alcohol, adding the rest water, and stirring until the high molecular polymer is fully dissolved.
In a third aspect, the invention provides the application of the emulsification viscosity reducer in thick oil emulsification viscosity reduction.
Preferably, the wax content in the thick oil is 5 to 25 wt%.
In a fourth aspect, the invention provides a method for emulsifying and viscosity reducing thick oil, which comprises the following steps: and (3) contacting an emulsification viscosity reducer with the thick oil, wherein the emulsification viscosity reducer is the emulsification viscosity reducer.
Preferably, the conditions of the contacting include: keeping the temperature at 25-200 deg.C, preferably 40-60 deg.C for 2-240min, preferably 90-150min, and stirring for 10-20 min.
Preferably, the amount of the emulsifying viscosity reducer is more than 30 wt% of the thick oil, and more preferably 30-70 wt%.
Preferably, the wax content in the thick oil is 5 to 25 wt%.
The emulsifying viscosity reducer can effectively reduce the viscosity of the thick oil, is particularly suitable for the thick oil with high wax content, can also be applied to common thick oil and super thick oil with low wax content, and has excellent adaptability to the thick oil of formation water containing high calcium and magnesium ions.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In one aspect, the invention provides an emulsification viscosity reducer comprising a cationic surfactant, a nonionic surfactant, an alcohol, and a high molecular weight polymer.
It should be understood by those skilled in the art that the emulsification viscosity reducer should be used by sufficiently dissolving each component in water in actual use, and therefore, it is preferable that the emulsification viscosity reducer of the present invention further contains water.
In the present invention, preferably, based on the weight of the emulsification viscosity reducer, the content of the cationic surfactant is 0.05 to 5 wt%, the content of the nonionic surfactant is 0.01 to 1 wt%, the content of the alcohol is 0.01 to 0.2 wt%, the content of the high molecular polymer is 0.01 to 1 wt%, and the balance is water; more preferably, based on the weight of the emulsification viscosity reducer, the content of the cationic surfactant is 0.1-0.8 wt%, the content of the nonionic surfactant is 0.05-0.2 wt%, the content of the alcohol is 0.05-0.1 wt%, the content of the high molecular polymer is 0.05-0.2 wt%, and the balance is water. In the above preferable case, the viscosity of the thick oil can be more effectively reduced.
In the present invention, the cationic surfactant is preferably alkyltrimethyl ammonium chloride and/or alkyltrimethyl ammonium bromide, and the number of carbon atoms in the alkyl group is preferably 3 to 20, more preferably 12 to 18; the cationic surfactant is more preferably at least one of dodecyltrimethyl ammonium chloride, tetradecyltrimethyl ammonium chloride, hexadecyltrimethyl ammonium chloride and octadecyltrimethyl ammonium chloride. In this preferable case, the viscosity of the thick oil can be reduced more effectively.
In the present invention, the nonionic surfactant is preferably at least one of alkylphenol ethoxylate, alkylphenol polyoxypropylene ether, fatty alcohol polyoxyethylene ether, and fatty alcohol polyoxypropylene ether. Among them, the alkyl group of the alkylphenol polyoxyethylene ether or the alkylphenol polyoxypropylene ether preferably has 5 to 15 carbon atoms, more preferably 7 to 10 carbon atoms, and the polymerization degree of the polyoxyethylene of the alkylphenol polyoxyethylene ether or the polyoxypropylene of the alkylphenol polyoxypropylene ether is preferably 5 to 20, more preferably 7 to 15, and for example, NP-7, NP-10, NP-15, OP-7, OP-10, OP-15, and the like produced by Jiangsu Haian petrochemical plants can be used. The number of carbon atoms of the alkyl group of the fatty alcohol-polyoxyethylene ether or fatty alcohol-polyoxypropylene ether is preferably 5-20, more preferably 8-14, and the degree of polymerization of the polyoxyethylene of the fatty alcohol-polyoxyethylene ether or the polyoxypropylene of the fatty alcohol-polyoxypropylene ether is preferably 3-20, more preferably 7-15, and for example, AEO-7, AEO-9, AEO-13, JFC-4, JFC-6, etc., which are produced in Jiangsu Haian petrochemical plants, may be used.
In the present invention, the alcohol is preferably a monohydric alcohol, the number of carbon atoms of the alcohol is preferably 1 to 12, more preferably 2 to 6, and the alcohol is more preferably ethanol and/or butanol.
In the present invention, the high molecular polymer is preferably at least one of polyacrylamide, xanthan gum, carboxymethyl cellulose, scleroglucan and polyvinyl alcohol, and the viscosity average molecular weight of polyacrylamide is preferably 500 × 104-3000×104. As the carboxymethyl cellulose, scleroglucan and polyvinyl alcohol, carboxymethyl cellulose commonly used in the art may be usedScleroglucan and polyvinyl alcohol.
The emulsifying viscosity reducer has excellent adaptability to the thick oil of formation water containing high calcium and magnesium ions, namely, the thick oil cannot be failed due to the high content of the calcium and magnesium ions in the formation water, so the requirement on the water in the emulsifying viscosity reducer is wider, for example, the mineralization degree of the water can be 0-25 multiplied by 104mg/L, calcium and magnesium ion content can be 0-2 × 104mg/L. In the present invention, the content of calcium and magnesium ions refers to the total content of calcium ions and magnesium ions. The water of the invention can be distilled water, oilfield injection water, oilfield produced water and the like.
In a second aspect, the present invention provides a method for preparing the emulsifying viscosity reducer, which comprises: the cationic surfactant, the nonionic surfactant, the alcohol and the high molecular polymer are completely dissolved in water.
In the present invention, there is no particular requirement on the specific dissolution mode, and various modes can be adopted as will occur to those skilled in the art, so long as the cationic surfactant, the nonionic surfactant, the alcohol and the high molecular polymer are completely dissolved in water in respective amounts to obtain the emulsifying viscosity reducer of the present invention. Since the high molecular polymer is relatively insoluble, for example, the following method can be used for dissolution to prepare the emulsifying viscosity reducer of the present invention: under the condition of stirring, adding the high molecular polymer into partial water, stirring until the high molecular polymer is fully dissolved, then adding the cationic surfactant, the nonionic surfactant and the alcohol, adding the rest water, and stirring until the high molecular polymer is fully dissolved.
It will be understood by those skilled in the art that "fully dissolved" means that no visible insoluble material is present after dissolution and "completely dissolved" means that all is dissolved away.
In the present invention, stirring is generally referred to as stirring at 200-400 rpm.
It will be appreciated by those skilled in the art that for better dissolution of the high molecular weight polymer, slow addition is preferred when adding the high molecular weight polymer. The portion of water is generally 1/3-2/3 of the total amount of water. Stirring to dissolve completely, typically at room temperature, e.g. 15-30 deg.C, for 3.5-4.5 hr. Stirring to dissolve completely, and stirring at normal temperature, such as 15-30 deg.C for 20-30min to dissolve completely.
In a third aspect, the invention provides the application of the emulsification viscosity reducer in thick oil emulsification viscosity reduction.
The emulsifying viscosity reducer can be used for emulsifying and reducing viscosity of common thick oil and super thick oil with low wax content, and is also suitable for emulsifying and reducing viscosity of high wax content thick oil, wherein the wax content in the high wax content thick oil is generally 5-25 wt%. Moreover, the emulsifying viscosity reducer has excellent adaptability to thick oil of formation water containing high calcium and magnesium ions.
In a fourth aspect, the invention provides a method for emulsifying and viscosity reducing thick oil, which comprises the following steps: and (3) contacting the emulsification viscosity reducer with the thick oil, wherein the emulsification viscosity reducer is the emulsification viscosity reducer.
The invention aims at the emulsification and viscosity reduction of thick oil by a specific emulsification viscosity reducer, so that no special requirement is required on a specific method for emulsification and viscosity reduction, and various methods commonly used in the field can be adopted, for example, the conditions for contacting the emulsification viscosity reducer with the thick oil can comprise: keeping the temperature at 25-200 deg.C, preferably 40-60 deg.C for 2-240min, preferably 90-150min, and stirring for 10-20 min.
The emulsifying viscosity reducer can be contacted with the thick oil at the temperature of 200 ℃ for emulsifying viscosity reduction, so the emulsifying viscosity reducer can be suitable for emulsifying viscosity reduction of the high-temperature thick oil.
In the present invention, the amount of the emulsification viscosity reducer used is preferably 30% by weight or more, more preferably 30 to 70% by weight, based on the viscous oil.
As mentioned above, the emulsifying viscosity reducer of the invention is suitable for emulsifying viscosity reduction of high wax content thick oil, and the wax content in the high wax content thick oil is generally 5-25 wt%.
Examples
The following examples further illustrate the invention but are not intended to limit the invention thereto.
In the following examples and comparative examples:
measurement of viscosity: at 50 deg.CUsing a Brookfield DV-II viscometer at a shear rate of 7.34S-1Under the conditions of (1).
Example 1
This example is intended to illustrate the emulsifying viscosity-reducing agent and the method for emulsifying viscosity-reducing thick oil according to the present invention.
(1) 50g of water (degree of mineralization: 160000mg/L, Ca in it) was taken2+Concentration: 10000Mg/L, Mg2+Concentration: 10000mg/L), 0.05g of polyacrylamide (viscosity average molecular weight 1000X 10) was slowly added with stirring at 400rpm4And the degree of hydrolysis is 20%), stirring for 4 hours at 25 ℃, adding 0.1g of cationic surfactant octadecyl trimethyl ammonium chloride, adding 0.05g of nonylphenol polyoxyethylene ether (the polymerization degree of polyoxyethylene is 10), adding 0.05g of ethanol, adding water to 100g, and stirring until the mixture is completely dissolved to obtain the emulsifying viscosity reducer A1.
(2) In a 200mL beaker, 30g of the emulsifying viscosity reducer A1 is added into 70g of Jiangsu oilfield wax-containing thick oil (the viscosity at 50 ℃ is 9630mPa.s, the wax content is 25 wt%, and the wax content in the crude oil is determined according to SY/T0537-2008), the beaker is placed in a water bath at 50 ℃ for constant temperature for 2h, stirring is carried out for 10 min, the thick oil is uniformly emulsified, and then the viscosity is determined to be 65mPa.s at 50 ℃.
Example 2
This example is intended to illustrate the emulsifying viscosity-reducing agent and the method for emulsifying viscosity-reducing thick oil according to the present invention.
(1) 50g of distilled water (degree of mineralization: 0mg/L, wherein Ca is present)2+Concentration: 0Mg/L, Mg2+Concentration: 0mg/L), 0.2g of polyacrylamide (viscosity average molecular weight 500X 10) was slowly added with stirring at 300rpm4And the degree of hydrolysis is 25%), stirring for 4.5h at 15 ℃, adding 0.8g of cationic surfactant dodecyl trimethyl ammonium chloride, adding 0.2g of octyl phenol polyoxypropylene ether (the polymerization degree of polyoxypropylene is 15), adding 0.1g of butanol, adding water to 100g, and stirring until complete dissolution to obtain the emulsifying viscosity reducer A2.
(2) In a 200mL beaker, 30g of the emulsifying viscosity reducer A2 is added into 70g of crude oil field wax-containing thick oil (the viscosity at 50 ℃ is 98000mPa.s, the wax content is 13 percent, and the wax content in the crude oil is determined according to SY/T0537-2008), the beaker is placed in a water bath at 40 ℃ for constant temperature for 2.5h, the stirring is carried out for 15 min, the thick oil is evenly emulsified, and then the viscosity is determined to be 35mPa.s at 50 ℃.
Example 3
This example is intended to illustrate the emulsifying viscosity-reducing agent and the method for emulsifying viscosity-reducing thick oil according to the present invention.
(1) 50g of water (degree of mineralization: 250000mg/L, Ca in it) was taken2+Concentration: 18000Mg/L, Mg2+Concentration: 2000mg/L), 0.1g of polyacrylamide (viscosity average molecular weight 3000X 10) was slowly added with stirring at 200rpm4Hydrolysis degree of 20%), stirring at 30 deg.C for 3.5h, adding 0.4g of cationic surfactant cetyl trimethyl ammonium chloride, adding 0.1g of lauryl polyoxyethylene ether (polymerization degree of polyoxyethylene is 13), adding 0.08g of butanol, adding water to 100g, and stirring until completely dissolved to obtain the emulsifying viscosity reducer A3.
(2) In a 200mL beaker, 70g of the emulsifying viscosity reducer A3 is added into 100g of crude oil field wax-containing thick oil (viscosity at 50 ℃ of 36000mPa.s, wax content of 5 wt%, wax content in crude oil is determined according to SY/T0537-2008), the beaker is placed in a water bath at 60 ℃ for constant temperature of 1.5h, stirring is carried out for 20min, the thick oil is evenly emulsified, and then the viscosity is determined to be 52mPa.s at 50 ℃.
Example 4
This example is intended to illustrate the emulsifying viscosity-reducing agent and the method for emulsifying viscosity-reducing thick oil according to the present invention.
An emulsifying viscosity-reducing agent was prepared according to example 1, except that the cationic surfactant, octadecyltrimethylammonium chloride, was used in an amount of 0.05g, to obtain an emulsifying viscosity-reducing agent A4. The thick oil of example 1 was subjected to emulsification viscosity reduction using emulsification viscosity reducer a4 according to the method of example 1, and then the viscosity was measured at 50 ℃ to be 160 mpa.s.
Example 5
This example is intended to illustrate the emulsifying viscosity-reducing agent and the method for emulsifying viscosity-reducing thick oil according to the present invention.
An emulsifying viscosity-reducing agent was prepared according to example 1, except that nonylphenol polyoxyethylene ether was used in an amount of 0.01g to obtain emulsifying viscosity-reducing agent A5. The thick oil of example 1 was subjected to emulsification viscosity reduction using emulsification viscosity reducer a5 in the same manner as in example 1, and then measured at 50 ℃ to have a viscosity of 129 mpa.s.
Example 6
This example is intended to illustrate the emulsifying viscosity-reducing agent and the method for emulsifying viscosity-reducing thick oil according to the present invention.
An emulsifying viscosity reducer was prepared according to example 1, except that ethanol was used in an amount of 0.01g, to obtain an emulsifying viscosity reducer A6. The thick oil of example 1 was subjected to emulsification viscosity reduction using emulsification viscosity reducer a6 in the same manner as in example 1, and then the viscosity was measured at 50 ℃ to be 167 mpa.s.
Example 7
This example is intended to illustrate the emulsifying viscosity-reducing agent and the method for emulsifying viscosity-reducing thick oil according to the present invention.
An emulsifying viscosity reducer was prepared according to example 1 except that polyacrylamide was used in an amount of 0.01g, to obtain an emulsifying viscosity reducer A7. The thick oil of example 1 was subjected to emulsification viscosity reduction using emulsification viscosity reducer a7 according to the method of example 1, and then the viscosity was measured at 50 ℃ to be 220 mpa.s.
Example 8
This example is intended to illustrate the emulsifying viscosity-reducing agent and the method for emulsifying viscosity-reducing thick oil according to the present invention.
An emulsifying viscosity reducer was prepared as in example 1, except that octadecyltrimethylammonium chloride was replaced with decaalkyltrimethylammoniumchloride to give emulsifying viscosity reducer A8. The thick oil of example 1 was subjected to emulsification viscosity reduction using emulsification viscosity reducer A8 according to the method of example 1, and then the viscosity was measured at 50 ℃ to be 460 mpa.s.
Example 9
This example is intended to illustrate the emulsifying viscosity-reducing agent and the method for emulsifying viscosity-reducing thick oil according to the present invention.
An emulsification viscosity reducer was prepared as in example 1, except that nonylphenol polyoxyethylene ether (polyoxyethylene having a polymerization degree of 10) was replaced with hexylphenol polyoxyethylene ether (polyoxyethylene having a polymerization degree of 5) to obtain emulsification viscosity reducer A9. The thick oil of example 1 was subjected to emulsification viscosity reduction using emulsification viscosity reducer a9 according to the method of example 1, and then the viscosity was measured at 50 ℃ to be 230 mpa.s.
Example 10
This example is intended to illustrate the emulsifying viscosity-reducing agent and the method for emulsifying viscosity-reducing thick oil according to the present invention.
An emulsification viscosity reducer was prepared as in example 3, except that lauryl polyoxyethylene ether (polyoxyethylene having a degree of polymerization of 13) was replaced with heptanol polyoxyethylene ether (polyoxyethylene having a degree of polymerization of 5) to obtain emulsification viscosity reducer a 10. The thick oil of example 3 was subjected to emulsification viscosity reduction using emulsification viscosity reducer a10 according to the method of example 3, and then the viscosity was measured at 50 ℃ to be 280 mpa.s.
Example 11
This example is intended to illustrate the emulsifying viscosity-reducing agent and the method for emulsifying viscosity-reducing thick oil according to the present invention.
An emulsifying viscosity-reducing agent was prepared as in example 1, except that polyacrylamide (viscosity average molecular weight 1000X 10)4Degree of hydrolysis of 20%) was replaced with polyacrylamide (viscosity average molecular weight 300X 10)4Degree of hydrolysis 20%) to obtain emulsifying viscosity reducer A12. The thick oil of example 1 was subjected to emulsification viscosity reduction using emulsification viscosity reducer a12 according to the method of example 1, and then the viscosity was measured at 50 ℃ to be 160 mpa.s.
Comparing example 1 with examples 4-7, respectively, it can be seen that the viscosity of the thick oil can be further reduced by using cationic surfactant 0.1-0.8 wt%, nonionic surfactant 0.05-0.2 wt%, alcohol 0.05-0.1 wt%, high molecular polymer 0.05-0.2 wt%, and water as the rest, based on the weight of the emulsifying viscosity reducer.
Comparing example 1 with example 8, it can be seen that the cationic surfactant is at least one of dodecyltrimethyl ammonium chloride, tetradecyltrimethyl ammonium chloride, hexadecyltrimethyl ammonium chloride and octadecyltrimethyl ammonium chloride, which can further reduce the viscosity of the thick oil.
Comparing example 1 with example 9, and comparing example 3 with example 10, it can be seen that the nonionic surfactant is at least one of alkylphenol polyoxyethylene ether, alkylphenol polyoxypropylene ether, fatty alcohol polyoxyethylene ether and fatty alcohol polyoxypropylene ether, wherein the carbon number of alkyl of the alkylphenol polyoxyethylene ether and the alkylphenol polyoxypropylene ether is 7-10, the polymerization degree of polyoxyethylene of the alkylphenol polyoxyethylene ether and polyoxypropylene of the alkylphenol polyoxypropylene ether is 7-15, the carbon number of alkyl of the fatty alcohol polyoxyethylene ether and fatty alcohol polyoxypropylene ether is 8-14, and the polymerization degree of polyoxyethylene of the fatty alcohol polyoxyethylene ether and polyoxypropylene of the fatty alcohol polyoxypropylene ether is 7-15, so that the viscosity of the thick oil can be further reduced.
As can be seen from a comparison between example 1 and example 11, the high-molecular polymer is at least one of polyacrylamide, xanthan gum, carboxymethyl cellulose, scleroglucan and polyvinyl alcohol, and the viscosity-average molecular weight of polyacrylamide is preferably 500X 104-3000×104The viscosity of the thick oil can be further reduced.
The emulsifying viscosity reducer can effectively reduce the viscosity of the thick oil, is particularly suitable for the thick oil with high wax content, can also be applied to common thick oil and super thick oil with low wax content, and has excellent adaptability to the thick oil of formation water containing high calcium and magnesium ions.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (16)
1. The emulsifying viscosity reducer is characterized by comprising a cationic surfactant, a nonionic surfactant, alcohol and a high molecular polymer, and further comprising water;
wherein, based on the weight of the emulsification viscosity reducer, the content of the cationic surfactant is 0.05-5 wt%, the content of the nonionic surfactant is 0.01-1 wt%, the content of the alcohol is 0.01-0.2 wt%, the content of the high molecular polymer is 0.01-1 wt%, and the balance is water;
wherein the cationic surfactant is alkyl trimethyl ammonium chloride and/or alkyl trimethyl ammonium bromide, and the carbon atom number of the alkyl is 12-18;
the nonionic surfactant is at least one of alkylphenol polyoxyethylene ether, alkylphenol polyoxypropylene ether, fatty alcohol polyoxyethylene ether and fatty alcohol polyoxypropylene ether; wherein, the carbon atom number of the alkyl of the alkylphenol polyoxyethylene ether and the alkylphenol polyoxypropylene ether is 7-10, and the polymerization degree of the polyoxyethylene of the alkylphenol polyoxyethylene ether and the polyoxypropylene of the alkylphenol polyoxypropylene ether is 7-15; the carbon atoms of the alkyl of the fatty alcohol-polyoxyethylene ether and the fatty alcohol-polyoxypropylene ether are 8-14, and the polymerization degree of polyoxyethylene of the fatty alcohol-polyoxyethylene ether and polyoxypropylene of the fatty alcohol-polyoxypropylene ether is 7-15;
the alcohol is monohydric alcohol, and the carbon atom number of the alcohol is 2-6;
the high molecular polymer is polyacrylamide; wherein the viscosity average molecular weight of the polyacrylamide is 500 multiplied by 104-3000×104。
2. The emulsification viscosity reducer of claim 1, wherein the cationic surfactant is present in an amount of 0.1-0.8 wt%, the nonionic surfactant is present in an amount of 0.05-0.2 wt%, the alcohol is present in an amount of 0.05-0.1 wt%, the high molecular polymer is present in an amount of 0.05-0.2 wt%, and the balance is water, based on the weight of the emulsification viscosity reducer.
3. The emulsification viscosity reducer of claim 1, wherein the cationic surfactant is at least one of dodecyl trimethyl ammonium chloride, tetradecyl trimethyl ammonium chloride, hexadecyl trimethyl ammonium chloride, and octadecyl trimethyl ammonium chloride.
4. The emulsification viscosity reducer of claim 1, wherein the alcohol is ethanol and/or butanol.
5. The emulsifying viscosity reducer of claim 1 or 2, wherein the degree of mineralization of the water is 0-25 x 104mg/L, calcium and magnesium ion content of 0-2 × 104mg/L。
6. The process for the preparation of the emulsifying viscosity reducer according to any one of claims 1 to 5, characterized in that it comprises: the cationic surfactant, the nonionic surfactant, the alcohol and the high molecular polymer are completely dissolved in water.
7. The method of claim 6, wherein the dissolving comprises: under the condition of stirring, adding the high molecular polymer into partial water, stirring until the high molecular polymer is fully dissolved, then adding the cationic surfactant, the nonionic surfactant and the alcohol, adding the rest water, and stirring until the high molecular polymer is fully dissolved.
8. Use of the emulsification viscosity reducer of any one of claims 1-5 in thick oil emulsification viscosity reduction.
9. Use according to claim 8, wherein the heavy oil has a wax content of 5-25% by weight.
10. A method for reducing viscosity of thick oil by emulsification, which comprises the following steps: contacting an emulsification viscosity reducer with thick oil, wherein the emulsification viscosity reducer is the emulsification viscosity reducer of any one of claims 1-5.
11. The method of claim 10, wherein the conditions of the contacting comprise: keeping the temperature at 25-200 deg.C for 2-240min, and stirring for 10-20 min.
12. The method of claim 11, wherein the conditions of the contacting comprise: keeping the temperature at 40-60 deg.C for 2-240min, and stirring for 10-20 min.
13. The method of claim 12, wherein the conditions of the contacting comprise: keeping the temperature at 40-60 deg.C for 90-150min, and stirring for 10-20 min.
14. The method according to claim 10, wherein the amount of the emulsification viscosity reducer is 30 wt% or more of the heavy oil.
15. The method of claim 14, wherein the amount of the emulsification viscosity reducer is 30-70 wt% of the thick oil.
16. The method of claim 10, wherein the heavy oil has a wax content of 5-25 wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510459108.1A CN106398675B (en) | 2015-07-30 | 2015-07-30 | Emulsification viscosity reducer, preparation method and application thereof, and thick oil emulsification viscosity reduction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510459108.1A CN106398675B (en) | 2015-07-30 | 2015-07-30 | Emulsification viscosity reducer, preparation method and application thereof, and thick oil emulsification viscosity reduction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106398675A CN106398675A (en) | 2017-02-15 |
| CN106398675B true CN106398675B (en) | 2019-12-27 |
Family
ID=58009400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510459108.1A Active CN106398675B (en) | 2015-07-30 | 2015-07-30 | Emulsification viscosity reducer, preparation method and application thereof, and thick oil emulsification viscosity reduction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106398675B (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108624313A (en) * | 2017-03-15 | 2018-10-09 | 中国石油化工股份有限公司 | For reducing the composition and heavy crude thinner and preparation method and viscosity reduction method and heavy crude reservoir recovery method of viscosity of thickened oil |
| CN108641698A (en) * | 2018-04-23 | 2018-10-12 | 谢新昇 | A kind of preparation method of polydactyl acid base heavy crude thinner |
| CN108559470A (en) * | 2018-05-10 | 2018-09-21 | 山东安捷宇石油技术服务有限公司 | A kind of self-emulsifying heavy crude thinner and its preparation method and application |
| CN109169654A (en) * | 2018-10-28 | 2019-01-11 | 扬州润达油田化学剂有限公司 | A kind of heavy oil wells Produced Liquid viscosity reduction fungicide and preparation method thereof |
| CN109504360B (en) * | 2019-01-14 | 2020-11-10 | 克拉玛依市三达新技术股份有限公司 | Thick oil viscosity reducer and preparation method and application thereof |
| CN110129020B (en) * | 2019-04-26 | 2021-09-28 | 中国石油化工股份有限公司 | Viscoelastic surfactant system and application thereof in exploitation of water-drive heavy oil reservoir |
| CN110157403B (en) * | 2019-05-08 | 2020-09-29 | 中国石油大学(北京) | Low-permeability oil reservoir oil displacement agent |
| CN112680293B (en) * | 2019-10-18 | 2022-07-08 | 中国石油化工股份有限公司 | Emulsifier, preparation method and application thereof, and method for emulsifying butter in alkaline washing tower |
| CN113549441A (en) * | 2020-04-23 | 2021-10-26 | 吉林省安和石油技术服务有限公司 | Preparation method of automatic-arrangement rapid-diffusion amphiphilic molecule viscosity reducer for oil extraction |
| CN111453791B (en) * | 2020-04-30 | 2022-06-03 | 大庆华营化工有限公司 | Water purification viscosity reducer and preparation method thereof |
| CN113773824B (en) * | 2020-06-09 | 2023-04-07 | 中国石油化工股份有限公司 | Thickened oil viscosity-reducing synergistic composition and preparation method and application thereof |
| CN111848864B (en) * | 2020-07-28 | 2022-07-01 | 宁波锋成先进能源材料研究院 | Amphiphilic copolymer and preparation method and application thereof |
| CN114763481A (en) * | 2021-01-11 | 2022-07-19 | 中国石油化工股份有限公司 | Thick oil emulsifying viscosity reducer, emulsified thick oil and preparation method thereof |
| CN113046173B (en) * | 2021-03-15 | 2024-01-23 | 宝钢湛江钢铁有限公司 | Method for reducing viscosity of waste oil in steel plant and method for treating low-viscosity mixed waste oil by using coal-fired power generation boiler |
| CN115368884B (en) * | 2021-05-21 | 2024-05-28 | 中国石油天然气股份有限公司 | Composite oil displacement system for high-freezing-point oil reservoir and preparation and application thereof |
| CN113930230A (en) * | 2021-12-16 | 2022-01-14 | 中海油田服务股份有限公司 | Thick oil viscosity reducer and preparation method thereof |
| CN115386359B (en) * | 2022-11-01 | 2023-01-17 | 山东东方盛嘉石油科技有限责任公司 | Viscous oil cold production dispersing huff and puff viscosity reducer and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3825585A1 (en) * | 1988-07-28 | 1990-02-08 | Rewo Chemische Werke Gmbh | Process for recovering crude oil by flooding with water with simultaneous use of nonionic, anionic and cationic surface-active substances |
| CN1778862A (en) * | 2004-11-17 | 2006-05-31 | 中国石油化工股份有限公司 | Inspissated oil emulsion viscidity reducer |
| CN103468235A (en) * | 2013-09-26 | 2013-12-25 | 东北石油大学 | Chemical assistant for thermal recovery of thick oil and application thereof |
| CN104610952A (en) * | 2014-12-23 | 2015-05-13 | 克拉玛依新科澳石油天然气技术股份有限公司 | Fluoro carbonic composite thickened oil viscosity reducer |
-
2015
- 2015-07-30 CN CN201510459108.1A patent/CN106398675B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3825585A1 (en) * | 1988-07-28 | 1990-02-08 | Rewo Chemische Werke Gmbh | Process for recovering crude oil by flooding with water with simultaneous use of nonionic, anionic and cationic surface-active substances |
| CN1778862A (en) * | 2004-11-17 | 2006-05-31 | 中国石油化工股份有限公司 | Inspissated oil emulsion viscidity reducer |
| CN103468235A (en) * | 2013-09-26 | 2013-12-25 | 东北石油大学 | Chemical assistant for thermal recovery of thick oil and application thereof |
| CN104610952A (en) * | 2014-12-23 | 2015-05-13 | 克拉玛依新科澳石油天然气技术股份有限公司 | Fluoro carbonic composite thickened oil viscosity reducer |
Non-Patent Citations (1)
| Title |
|---|
| 塔河油田超稠油乳化降黏剂的研制;裴海华 等;《油田化学》;20100625;第27卷(第2期);第137-140页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106398675A (en) | 2017-02-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106398675B (en) | Emulsification viscosity reducer, preparation method and application thereof, and thick oil emulsification viscosity reduction method | |
| CN109812249B (en) | Oil reservoir oil displacement method | |
| WO2019011045A1 (en) | Water-based viscosity reducer for emulsifying super heavy oils and preparation method therefor | |
| CN105733547B (en) | One kind low frictional resistance resistant to high temperatures aggravates clean fracturing fluid and preparation method thereof | |
| CN109111906B (en) | Thick oil emulsifying viscosity reducer | |
| CN108285784B (en) | Gelled emulsified acid and preparation method thereof | |
| CN110396401B (en) | Thick oil emulsification viscosity reducer and preparation method thereof, thick oil emulsification viscosity reduction method, application of thick oil emulsification viscosity reduction method in thick oil reservoir exploitation and exploitation method | |
| CN107365574A (en) | A kind of viscosity reduction oil displacement agent for common heavy oil reservoir and preparation method thereof | |
| CN109312226B (en) | High temperature viscoelastic surfactant (VES) fluids comprising polymeric viscosity modifiers | |
| CN102516976A (en) | Preparation method of multi-component organic cross-linked acid liquid | |
| CN109810685B (en) | Oil displacement agent composition and preparation method and application thereof | |
| CN103755868A (en) | Resistance reducing agent for fracturing quick water of shale gas and preparation method thereof | |
| CN100366702C (en) | High temperature proof acid-in-oil emulsion in low friction resistance | |
| CN110358517B (en) | Composite surfactant oil displacement system suitable for high-calcium-magnesium oil reservoir and preparation method thereof | |
| CN109504360B (en) | Thick oil viscosity reducer and preparation method and application thereof | |
| CN104559995A (en) | Delayed crosslinking fracturing fluid composition | |
| CN109609109A (en) | A kind of profile control system and preparation method thereof | |
| CN112195022B (en) | Foaming agent for carbon dioxide foam fracturing system and preparation method and application thereof | |
| CN111040752B (en) | Low-adsorption fracturing fluid system and preparation method thereof | |
| CN108545991B (en) | Concrete additive long-chain fatty acid emulsion and preparation method thereof | |
| CN110804316B (en) | Cationic system high-solid-content SBS (styrene butadiene styrene) modified emulsified asphalt | |
| CN106978156B (en) | High-temperature viscosity reduction foaming agent composition, high-temperature viscosity reduction foaming agent and preparation method of high-temperature viscosity reduction foaming agent composition | |
| CN105542732A (en) | Autogenetic foam micelle acid liquid for water injection well | |
| CN115746820A (en) | High-temperature-resistant carbon dioxide foam fracturing fluid and preparation method and application thereof | |
| CN114437705A (en) | Organic crosslinking acid and organic aluminum zirconium crosslinking agent for acid fracturing and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |