CN113072921A - Viscosity reducer for ultra-thick oil in shaft - Google Patents
Viscosity reducer for ultra-thick oil in shaft Download PDFInfo
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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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
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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
Abstract
The invention belongs to the technical field of oilfield application chemistry, and particularly relates to a viscosity reducer for ultra-thick oil of a shaft. The viscosity reducer comprises the following components in parts by weight: 1-10 parts of nano auxiliary agent, 10-100 parts of anionic non-ionic polymer surfactant, 10-100 parts of anionic surfactant, 1-10 parts of penetrating agent, 1-10 parts of dispersing agent and 0.1-2000 times of water in total amount of the components. The viscosity reducer for thick oil in the shaft has the characteristic of strong salt and temperature resistance, can efficiently emulsify and disperse thick oil with high colloid and asphaltene content in the viscosity reducing shaft under the condition of micro disturbance, and has the viscosity reduction rate of more than 98 percent.
Description
Technical Field
The invention belongs to the technical field of oilfield application chemistry, and particularly relates to a viscosity reducer for ultra-thick oil of a shaft.
Background
The super heavy oil has low light component content, high asphaltene and colloid content and low straight chain hydrocarbon content, so that most of the super heavy oil has the characteristics of high viscosity and high density, and is difficult to recover and transport. Especially, in the gathering and transportation process, when the super heavy oil is lifted to the ground from the shaft, the viscosity of the super heavy oil is rapidly increased along with the influence of factors such as temperature reduction and the like, so that a channel is blocked. The addition of the emulsifying viscosity reducer is a relatively new viscosity reduction technology for the ultra-thick oil in the shaft, the main component of the emulsifying viscosity reducer is a surfactant, and the ultra-thick oil in the shaft is changed from a water-in-oil emulsified state to an emulsified state taking water as an external phase by reducing the tension of an oil-water interface, so that the viscosity of the ultra-thick oil is greatly reduced, and the energy consumption and the operation cost can be greatly saved.
Since the 90 s of the 20 th century, a plurality of heavy oil reservoirs realize field tests of heavy oil pipe transportation by adding a surfactant, and a plurality of precious experiences are obtained, great progress is made in the aspects of heavy oil exploitation and transportation, and the emulsification viscosity reduction rate of the heavy oil exceeds 90%. Meanwhile, the demulsification and dehydration technology of crude oil emulsion is also researched, and valuable technical support is provided for realizing the emulsification and normal-temperature transportation of the thickened oil. Many articles and patents have been published on the viscosity reduction of thick oil, but many problems still exist at present, such as universality of viscosity reducers, temperature and salt resistance, demulsification after viscosity reduction, and the like. Especially, the viscosity reduction of the super heavy oil is very difficult. The following are typical viscosity reduction study examples:
recently, a new composite viscosity reducer is reported in China, and the viscosity reducer combines the advantages of oil-soluble viscosity reducers and water-soluble viscosity reducers. The molecular chain of the viscosity reducer is grafted with amphiphilic groups with higher carbon number and salt-resistant hydrophilic groups, and the viscosity is reduced through dispersing and emulsifying capabilities. Experimental tests show that the viscosity reducer can realize 50% viscosity reduction of the super-heavy oil without water. The agent can realize ultra-low interfacial tension and form stable O/W emulsion.
Chinese patent application CN 102140909A discloses a method for emulsifying and reducing viscosity of thick oil, which comprises mixing agent A selected from one or more of distillate oil of refinery, light oil or medium oil with thick oil; adding agent B into the mixture of the thickened oil and the agent A, and mixing to form an oil-in-water emulsion, wherein the agent B consists of an anionic surfactant, a nonionic-anionic surfactant and water. The emulsification viscosity reduction method disclosed by the invention does not use alkali, has strong mineral salt resistance, can emulsify the ultrahigh-viscosity thick oil with the viscosity of more than 500000mPa.s at 50 ℃, and has low viscosity and moderate emulsification cost. The method is complex and high in cost, and light oil is used for reducing viscosity in the first step.
Chinese patent CN 105001847B discloses a salt-resistant thickened oil dispersion drag reducer and a preparation method thereof, wherein the salt-resistant thickened oil dispersion drag reducer comprises the following components in percentage by weight: 5-10% of an intermediate, 5-10% of fatty alcohol polyoxyethylene polyoxypropylene ether, 20-30% of EDY, and the balance of water; the intermediate comprises the following components in percentage by weight: 5-10% of modified acrylic acid, 80-90% of acrylamide, 5-10% of fatty alcohol-polyoxyethylene ether acrylate, and the proportion of the modified acrylic acid is 75-85% of dodecylaniline and 15-25% of acrylic acid. The salt-resistant type viscous oil dispersion drag reducer is suitable for the exploitation of viscous oil in an oil field, and can permeate into colloid asphaltene molecules in crude oil under the condition of no stirring or micro stirring to disperse a stacked colloid asphaltene molecule structure, wherein the reversed-phase component can change the hydrophilic-lipophilic balance of the colloid asphaltene molecules, so that the production viscosity of the viscous oil is reduced, and the yield of the crude oil is increased. The method does not describe the viscosity reduction of the crude oil with the viscosity exceeding 50000 mP.s.
CN100516164C discloses a high-temperature and high-salt resistant nano-emulsion viscosity reducer. The viscosity reducer consists of a nonionic surfactant, an anionic surfactant, a modified nano-additive, NaOH, an accelerator and water. The preparation method comprises the following steps: adding OP-105-7%, promoter 2-5% and modified nano-additive 0.5-2% at normal temperature and pressure, and stirring uniformly; then adding 30-45% of anionic surfactant and 1-3% of peregal; and finally, adding 20-30% of NaOH and 20-40% of water, and continuously stirring at the rotating speed of 60-120 r/min for 60-90 min to obtain the nano-emulsion viscosity reducer product. The viscosity reducer has good system stability, and can not be agglomerated during storage; the formed oil-in-water particles are smaller and more uniform, and the seepage capability is improved; the method can greatly reduce the interfacial tension and improve the oil displacement efficiency, and can be used in the fields of thick oil exploitation and transportation. The method has the problem that the demulsification difficulty is increased after emulsification and viscosity reduction, and is not beneficial to oil-water separation in the later period.
However, the existing emulsification viscosity reduction technology for reducing viscosity of shaft super-heavy oil has several problems, namely, the surfactant has poor temperature resistance and salt tolerance, and the condition of shaft high temperature resistance after steam flooding cannot be met; secondly, emulsion system formed after emulsification and viscosity reduction is difficult to break; thirdly, the viscosity reducer is mixed with produced liquid without violent disturbance in a shaft, and the viscosity reducing effect is not good.
Disclosure of Invention
In order to overcome the technical defects, the invention provides a viscosity reducer for ultra-thick oil in a shaft. The thick oil viscosity reducer prepared by the invention has the advantages of high viscosity reduction rate, low use concentration and good temperature resistance and salt tolerance. Under the condition of micro disturbance, the chemical agent can effectively and fully act with the super heavy oil in a shaft, reduce the viscosity and improve the fluidity.
The invention mainly aims to provide a viscosity reducer for ultra-thick oil in a shaft, which comprises the following chemical agents in parts by weight: 1-10 parts of nano auxiliary agent, 10-100 parts of anionic non-ionic polymer surfactant, 10-100 parts of anionic surfactant, 1-10 parts of penetrating agent, 1-10 parts of dispersing agent and 0.1-2000 times of water in total amount of the components.
Preferably, the composition comprises the following components in parts by weight: 1 part of nano-additive, 20-90 parts of anionic non-ionic polymer surfactant, 20-90 parts of anionic surfactant, 2-9 parts of penetrating agent, 2-9 parts of dispersing agent and 0.2-1500 times of water of the total amount of the components.
Preferably, the nano auxiliary agent is modified nano silicon dioxide.
Preferably, the particle size of the modified nano silicon dioxide is 10-100 nm, and the surface of the modified nano silicon dioxide is modified by a silane coupling agent K570.
Preferably, the anionic-nonionic high molecular surfactant is phosphate ester salt or sulfate ester salt of a phenolic resin polyoxyethylene polyoxypropylene block polymer.
Preferably, the anionic surfactant is sodium dodecylbenzenesulfonate. The anionic activator is cheap and easy to obtain, and can easily react with colloid and asphaltene in the thick oil.
Preferably, the penetrant is high-temperature-resistant high-alcohol polyoxyethylene ether phosphate.
Preferably, the dispersant is a water-soluble polymer, polyvinyl alcohol, polyacrylate or polyacrylamide.
Preferably, the degree of polymerization of the phenolic resin in the anionic-nonionic high molecular surfactant is 2-10, the block polyether is a triblock polymer, the triblock polymer is polyethylene oxide-polypropylene oxide-polyethylene oxide respectively, and the degree of polymerization is 3-90, 3-90 and 3-90 respectively.
Preferably, the penetrant is a higher alcohol with 8-18 carbon atoms and 3-20 polymerization degree of polyoxyethylene.
The higher the polymerization degree of the phenolic resin and the block polyether is, the higher the carbon atom number and the polymerization degree of the penetrant are, the higher the corresponding viscosity reduction efficiency is, but the too high polymerization degree is difficult to realize in production, the too high carbon atom number is easy to generate solidification, and the application effect of the polymerization degree in the range of the invention is the best.
The viscosity reducer for thick oil in the shaft has the characteristic of strong salt and temperature resistance, can efficiently emulsify and disperse thick oil with high colloid and asphaltene content in the viscosity reducing shaft under the condition of micro disturbance, and has the viscosity reduction rate of more than 98 percent.
The thick oil viscosity reducer is suitable for reducing viscosity of common thick oil, extra thick oil and ultra thick oil in a shaft, has the water content of over 30 percent, and is suitable for reducing viscosity of ultra thick oil under the stratum conditions with various degrees of mineralization. The dispersion system after emulsification and viscosity reduction is beneficial to pipe transportation and does not influence the subsequent demulsification work.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, and/or combinations thereof, unless the context clearly indicates otherwise.
In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments.
Example 1
Taking 1g of modified nano-silica, 30g of alkyl phenolic resin polyoxyethylene polyoxypropylene block polyether sulfate (the polymerization degree of phenolic resin is 10, the polymerization degree of block polyether is polyethylene oxide-polypropylene oxide-polyethylene oxide, and the polymerization degrees are respectively 90), 20g of sodium dodecyl benzene sulfonate, 1g of lauryl polyoxyethylene ether (polymerization degree of 10) phosphate, 1g of polyacrylate and 47g of water, and stirring in a 250mL three-necked bottle at 30 ℃ for 30min to obtain the viscosity reducer.
Example 2
Taking 0.5g of modified nano silicon dioxide, 20g of alkyl phenolic resin polyoxyethylene polyoxypropylene block polyether sulfate (the polymerization degree of phenolic resin is 10, the polymerization degree of block polyether is polyethylene oxide-polypropylene oxide-polyethylene oxide, and the polymerization degrees are respectively 90), 10g of sodium dodecyl benzene sulfonate, 0.5g of lauryl alcohol polyoxyethylene ether (polymerization degree of 10) phosphate, 1g of polyacrylate and 68g of water, and stirring in a 250mL three-necked bottle at 30 ℃ for 30min to obtain the viscosity reducer.
Example 3
Taking 0.1g of modified nano silicon dioxide, 10g of alkyl phenolic resin polyoxyethylene polyoxypropylene block polyether sulfate (the polymerization degree of phenolic resin is 10, the polymerization degree of block polyether is polyethylene oxide-polypropylene oxide-polyethylene oxide, and the polymerization degrees are respectively 90), 5g of sodium dodecyl benzene sulfonate, 0.4g of lauryl alcohol polyoxyethylene ether (polymerization degree of 10) phosphate, 0.5g of polyacrylate and 84g of water, and stirring in a 250mL three-necked bottle at 30 ℃ for 30min to obtain the viscosity reducer.
Example 4
Taking 0.05g of modified nano silicon dioxide, 5g of alkyl phenolic resin polyoxyethylene polyoxypropylene block polyether sulfate (the polymerization degree of phenolic resin is 10, the polymerization degree of block polyether is polyethylene oxide-polypropylene oxide-polyethylene oxide, and the polymerization degrees are respectively 90), 3g of sodium dodecyl benzene sulfonate, 0.25g of lauryl alcohol polyoxyethylene ether (polymerization degree of 10) phosphate, 0.2g of polyacrylate and 91.5g of water, and stirring in a 250mL three-necked bottle at 30 ℃ for 30min to obtain the viscosity reducer.
Example 5
Taking 0.5g of modified nano silicon dioxide, 20g of alkyl phenolic resin polyoxyethylene polyoxypropylene block polyether sulfate (the polymerization degree of phenolic resin is 2, the polymerization degree of block polyether is 3 respectively, polyethylene oxide-polypropylene oxide-polyethylene oxide is adopted, the polymerization degree is 3), 10g of sodium dodecyl benzene sulfonate, 0.5g of octanol polyoxyethylene ether phosphate (the polymerization degree of polyoxyethylene is 3), 1g of polyacrylate and 68g of water, and stirring in a 250mL three-necked bottle at 30 ℃ for 30min to obtain the viscosity reducer.
Example 6
Taking 0.5g of modified nano silicon dioxide, 20g of alkyl phenolic resin polyoxyethylene polyoxypropylene block polyether sulfate (the polymerization degree of phenolic resin is 10, the polymerization degree of block polyether is polyethylene oxide-polypropylene oxide-polyethylene oxide, and the polymerization degrees are respectively 90), 10g of sodium dodecyl benzene sulfonate, 0.5g of octadecanol polyoxyethylene ether phosphate (the polymerization degree of polyoxyethylene is 20), 1g of polyacrylate and 68g of water, and stirring in a 250mL three-necked bottle at 30 ℃ for 30min to obtain the viscosity reducer.
Comparative example 1
The difference from example 2 is that the anionic surfactant used is a petroleum sodium sulfonate formaldehyde condensate, and the rest is the same as example 2.
Comparative example 2
The difference from example 2 is that the anionic surfactant used is sodium nonylphenol polyoxyethylene ether carboxylate, and the rest is the same as example 2.
The application case is as follows:
selecting an ultra-thick oil sample (the viscosity at 50 ℃ is 30 ten thousand mPa.s, the mineralization degree of produced water is 20000ppm) of Zheng 411 blocks in an oil field petroleum development center victory management area, adopting the viscosity reducer prepared in examples 1-6 and comparative examples 1-2, and mixing the oil sample with the viscosity reducer according to the oil-water ratio of 3: 7, wherein the content of the viscosity reducer is 0.3 percent, the viscosity reduction temperature is 130 ℃, and the viscosity reduction rate is measured. The viscosity reduction rates are specifically shown in the following table 1:
TABLE 1
Selecting an ultra-thick oil sample (the viscosity is 30 ten thousand mPa.s at 50 ℃, and the mineralization degree of produced water is 20000ppm) of an Zheng 411 block in an oil field petroleum development center victory management area, adopting the viscosity reducer prepared in the example 2, and mixing the oil sample with the viscosity reducer according to an oil-water ratio of 3: 7, wherein the content of the viscosity reducer is 0.3 percent, the viscosity reduction temperature is 90 ℃, and the viscosity reduction rate is 99.5 percent.
Selecting an ultra-thick oil sample (the viscosity is 30 ten thousand mPa.s at 50 ℃, and the mineralization degree of produced water is 20000ppm) of an Zheng 411 block in an oil field petroleum development center victory management area, adopting the viscosity reducer prepared in the example 2, and mixing the oil sample with the viscosity reducer according to an oil-water ratio of 3: 7, wherein the content of the viscosity reducer is 0.3 percent, the viscosity reduction temperature is 70 ℃, and the viscosity reduction rate is 99.3 percent.
Selecting an ultra-thick oil sample (the viscosity is 30 ten thousand mPa.s at 50 ℃, and the mineralization degree of produced water is 20000ppm) of an Zheng 411 block in an oil field petroleum development center victory management area, adopting the viscosity reducer prepared in the example 2, and mixing the oil sample with the viscosity reducer according to an oil-water ratio of 3: 7, wherein the content of the viscosity reducer is 0.3 percent, the viscosity reduction temperature is 60 ℃, and the viscosity reduction rate is 93.5 percent.
Selecting an ultra-thick oil sample (the viscosity is 30 ten thousand mPa.s at 50 ℃, and the mineralization degree of produced water is 20000ppm) of an Zheng 411 block in an oil field petroleum development center victory management area, adopting the viscosity reducer prepared in the example 2, and mixing the oil sample with the viscosity reducer according to an oil-water ratio of 3: 7, wherein the content of the viscosity reducer is 0.2 percent, the viscosity reduction temperature is 130 ℃, and the viscosity reduction rate is 99.6 percent.
Selecting an ultra-thick oil sample (the viscosity is 30 ten thousand mPa.s at 50 ℃, and the mineralization degree of produced water is 20000ppm) of an Zheng 411 block in an oil field petroleum development center victory management area, adopting the viscosity reducer prepared in the example 2, and mixing the oil sample with the viscosity reducer according to an oil-water ratio of 3: 7, wherein the content of the viscosity reducer is 0.2 percent, the viscosity reduction temperature is 80 ℃, and the viscosity reduction rate is 99.1 percent.
Selecting an ultra-thick oil sample (the viscosity is 30 ten thousand mPa.s at 50 ℃, and the mineralization degree of produced water is 20000ppm) of an Zheng 411 block in an oil field petroleum development center victory management area, adopting the viscosity reducer prepared in the example 2, and mixing the oil sample with the viscosity reducer according to an oil-water ratio of 3: 7, wherein the content of the viscosity reducer is 0.15 percent, the viscosity reduction temperature is 80 ℃, and the viscosity reduction rate is 89.5 percent.
The viscosity reducer prepared in the example 2 is used for viscosity reduction of a well bore of a super-heavy oil well of Zheng 411 district Ping-19 # of victory oil field petroleum development center. The temperature of the well bore is 130-150 ℃, and the daily liquid production is 10m3About, the water content is 50-60%, the well is a serious emulsification oil well, and the produced liquid hardly flows out free water. The well directly adopts a continuous dosing mode, the daily dosing amount is reduced from 50kg to 6kg, and the electric heating is gradually reduced from 75A to 20A after 30 days.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. The viscosity reducer for the ultra-thick oil of the shaft is characterized by comprising the following components in parts by weight: 1-10 parts of nano auxiliary agent, 10-100 parts of anionic non-ionic polymer surfactant, 10-100 parts of anionic surfactant, 1-10 parts of penetrating agent, 1-10 parts of dispersing agent and 0.1-2000 times of water in total amount of the components.
2. The viscosity reducer according to claim 1, which comprises the following components in parts by weight: 1 part of nano-additive, 20-90 parts of anionic non-ionic polymer surfactant, 20-90 parts of anionic surfactant, 2-9 parts of penetrating agent, 2-9 parts of dispersing agent and 0.2-1500 times of water of the total amount of the components.
3. The viscosity reducer according to claim 1 or 2, wherein the nano auxiliary agent is modified nano zinc dioxide.
4. The chemical agent according to claim 3, wherein the particle size of the modified nano silica is 10-100 nm, and the surface of the modified nano silica is modified by a silane coupling agent K570.
5. The viscosity reducing agent according to claim 1 or 2, wherein the anionic nonionic polymer surfactant is a phosphate ester salt or a sulfate ester salt of a phenol resin polyoxyethylene polyoxypropylene block polymer.
6. Viscosity reducer according to claim 1 or 2, in which the anionic surfactant is sodium dodecylbenzenesulfonate.
7. Viscosity reducer according to claim 1 or 2, in which the penetrant is a high-temperature-resistant higher alcohol polyoxyethylene ether phosphate.
8. Viscosity reducer according to claim 1 or 2, in which the dispersant is a water-soluble polymer polyvinyl alcohol, polyacrylate or polyacrylamide.
9. The viscosity reducer according to claim 5, wherein the degree of polymerization of the phenolic resin is 2 to 10, the block polyether is a triblock polymer comprising polyethylene oxide-polypropylene oxide-polyethylene oxide in this order, and the degree of polymerization is 3 to 90, and 3 to 90, respectively.
10. The viscosity reducing agent according to claim 7, wherein the higher alcohol has 8 to 18 carbon atoms and the degree of polymerization of polyoxyethylene is 3 to 20.
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