CN115466607A - Microemulsion paraffin removal and prevention agent and preparation method and application thereof - Google Patents
Microemulsion paraffin removal and prevention agent and preparation method and application thereof Download PDFInfo
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- CN115466607A CN115466607A CN202110646806.8A CN202110646806A CN115466607A CN 115466607 A CN115466607 A CN 115466607A CN 202110646806 A CN202110646806 A CN 202110646806A CN 115466607 A CN115466607 A CN 115466607A
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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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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing, limiting or eliminating the deposition of paraffins or like substances
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change
Abstract
The invention provides a microemulsion wax cleaning and preventing agent and a preparation method and application thereof, wherein the microemulsion wax cleaning and preventing agent comprises an oil phase, fatty alcohol ether acid salt, fatty alcohol polyether, fatty acid amide betaine, fatty acid glycol amide, a cosolvent and water, and the mass ratio of the oil phase, the fatty alcohol ether acid salt, the fatty alcohol polyether, the fatty acid amide betaine, the fatty acid glycol amide, the cosolvent and the water is (10-40): 6-15): 5-20): 3-10): 5-20): 20-70. The microemulsion paraffin removal and prevention agent has high paraffin prevention rate and surface activity.
Description
Technical Field
The invention belongs to the technical field of oil exploitation, and particularly relates to a microemulsion paraffin removal and prevention agent, and a preparation method and application thereof.
Background
Most of crude oil produced in China contains a certain amount of wax, the wax in the crude oil in the stratum usually exists in a dissolved state, but the wax dissolved in the crude oil in the stratum gradually separates out from the crude oil, crystallizes and deposits on the surface of an oil pipe along with the reduction of temperature and pressure in the production process, so that the wax on the surface of the oil pipe is precipitated. In addition, wax deposits also form on the surface of oil pipelines due to the reduction of temperature or pressure during the transportation of wax-containing crude oil. Wax precipitation can cause the pipeline to shrink, even block the pipeline, thereby greatly reducing the crude oil yield and the capability of conveying oil. Therefore, wax removal and wax control operations are often required in oil fields.
In order to ensure the yield and the production efficiency of an oil well, the methods for preventing paraffin deposition in crude oil production mainly comprise mechanical paraffin removal, thermal paraffin removal and prevention, chemical paraffin removal and prevention and the like. The earliest traditional paraffin removal and prevention method is a mechanical paraffin scraping method, and a hot oil or steam hot washing method is developed later, mechanical paraffin removal and thermal paraffin removal can effectively remove paraffin deposited in an oil well, but the oil well has to be stopped during operation of the two methods, the labor intensity is high, the energy consumption is high, a large amount of well washing water can enter a stratum to cause clay expansion when the pressure of an oil layer is low in the thermal paraffin removal mode, the oil layer is blocked, the stratum is polluted, and in addition, the thermal paraffin removal can cause a well washing liquid to flow backwards to influence normal production. During the hot washing and wax removal process, the heat loss on the shaft is large, and the wax at the bottom of the shaft is difficult to remove.
With the development of the technology, methods such as sound wave wax removal and prevention and bacterial wax removal and prevention appear, but the two methods have high requirements on equipment or environment, have very strong operation technology and are not beneficial to field application.
The chemical agent paraffin removal and prevention technology can overcome the defects of the method, has good paraffin removal effect and has good market application prospect. The paraffin removal and prevention agent used for chemical paraffin removal mainly comprises an oil-based paraffin removal agent and a water-based paraffin removal and prevention agent, the oil-based paraffin removal agent has high paraffin dissolution speed and high paraffin removal efficiency, but has low density and is not suitable for oil wells with higher water content, and the oil-based paraffin removal and prevention agent is volatile, flammable and explosive, has poor safety and needs strict fire prevention measures when in use. The water-based paraffin remover and inhibitor can overcome the defects of the oil-based paraffin remover and has certain advantages, but the water-based paraffin remover and inhibitor generally has poor paraffin removing effect. The emulsion type paraffin removal and prevention agent combines an oil-based paraffin removal and prevention agent and a water-based paraffin removal and prevention agent, and has better comprehensive performance. The emulsion type clear paraffin inhibitor not only has the advantages of oil-based clear paraffin inhibitor and water-based clear paraffin inhibitor, but also overcomes the defects of the oil-based clear paraffin inhibitor and the water-based clear paraffin inhibitor. The Chinese patent application with publication number CN105255468A discloses an emulsion wax removing and preventing agent, which comprises the following components in percentage by weight: 45-60% of No. 150 solvent oil, 4.5-6% of octylphenol polyoxyethylene ether, 4.5-6% of fatty alcohol polyoxyethylene ether, 2.25-3% of polyoxyethylene sorbitan monostearate, 3-4% of ether cosolvent and the balance of water. The wax removing and preventing agent in the patent is an emulsion type wax removing and preventing agent, but the wax removing and preventing agent has lower wax preventing rate. The Chinese patent application with publication number CN104371685A discloses a wax removing and preventing agent, which consists of the following components in percentage by weight: the wax-removing and wax-preventing agent comprises 15-25% of alcohol ether, 7-12% of fatty alcohol-polyoxyethylene ether, 0.15-0.25% of alkali, 13-15% of antifreeze, 5-10% of glycol and 30-40% of emulsifier, but also has the defect of low wax-preventing rate of the wax-removing and wax-preventing agent.
Disclosure of Invention
In view of the above, the present invention aims to solve the above problems in the prior art and provide a microemulsion paraffin removal and prevention agent, a preparation method and an application thereof, wherein the microemulsion paraffin removal and prevention agent has high paraffin prevention rate and surface activity.
The purpose of the invention is realized by the following technical scheme.
The microemulsion paraffin removal and prevention agent comprises an oil phase, fatty alcohol ether acid salt, fatty alcohol polyether, fatty acid amide betaine, fatty acid glycol amide, a cosolvent and water, wherein the mass ratio of the oil phase, the fatty alcohol ether acid salt, the fatty alcohol polyether, the fatty acid amide betaine, the fatty acid glycol amide, the cosolvent and the water is (10-40): 6-15): 5-20): 3-10: (5-20): 20-70).
Through a large number of experiments, the inventor of the application finds that fatty alcohol ether acid salt, fatty acid amide betaine, fatty acid glycol amide, fatty alcohol polyether and cosolvent are compounded and dissolved in oil phase such as condensate oil to prepare oil-in-water microemulsion, namely the microemulsion paraffin removal and prevention agent, and the microemulsion paraffin removal and prevention agent not only has the advantage of high paraffin dissolution speed of the oil-soluble paraffin removal and prevention agent, but also has the safety of the water-soluble paraffin removal and prevention agent due to the fact that the external phase of the paraffin removal and prevention agent is water, and is not easy to burn and explode. Furthermore, the microemulsion paraffin removal and prevention agent is close to neutrality in whole, does not have strong acidity or alkalinity, does not corrode oil extraction equipment, and has high safety. In addition, the microemulsion paraffin removal and prevention agent has higher relative density, is easy to sink to the bottom of a well, and is convenient to use.
The microemulsion paraffin removal and prevention agent provided by the invention is characterized in that the mass ratio of the oil phase, the fatty alcohol ether acid salt, the fatty alcohol polyether, the fatty acid amide betaine, the fatty acid glycol amide, the cosolvent and water is (10-30), (7-15), (5-10), (5-20) and (20-70).
The microemulsion paraffin remover and inhibitor provided by the invention can be used for removing paraffin and inhibiting paraffin. The condensate mainly comprises C5-C8 hydrocarbons.
The present invention is not particularly limited as to the type of condensate, and any known condensate in the art may be used. In some embodiments, the condensate is a paraffinic condensate, an intermediate based condensate, or a naphthenic condensate.
The microemulsion paraffin removal and prevention agent provided by the invention can be fatty alcohol ether carboxylate or fatty alcohol ether sulfonate, and is preferably C8-C18 fatty alcohol ether carboxylate or C8-C18 fatty alcohol ether sulfonate. Examples of fatty alcohol etherates suitable for use in the present invention include, but are not limited to: isomeric tridecanol ether carboxylate and isomeric tridecanol ether sulfonate.
In some embodiments, the fatty alcohol ether carboxylate is an isomeric tridecanol ether carboxylate. The number of polyoxyethylene structural units (EO) in the isomeric tridecanol ether carboxylates can be from 5 to 20, preferably from 5 to 10. In the invention, the isomeric tridecanol ether carboxylate can be obtained commercially, and can also be prepared in a laboratory. For example, the alcohol can be obtained by direct reaction of isomeric tridecanol polyoxyethylene, available from Keplerian Biotech, inc. of Shandong, under the trade name isomeric alcohol ether 1307, in the presence of oxygen and sodium hydroxide.
According to the microemulsion paraffin remover and inhibitor provided by the invention, the fatty alcohol polyether is fatty alcohol polyoxyethylene ether or fatty alcohol polyoxypropylene ether, and preferably C12-C18 fatty alcohol polyoxyethylene ether or C12-C18 fatty alcohol polyoxypropylene ether. In some embodiments, the fatty alcohol polyether is the isomeric tridecanol polyoxyethylene ether. The number of polyoxyethylene structural units (EO) in the isomeric tridecanol polyoxyethylene ethers may be from 5 to 20, preferably from 5 to 10. For example, the isomeric tridecanol polyoxyethylene ethers available from Kepler Biotech, inc. of Shandong under the trade designation isomeric alcohol ethers 1307 may be used in the present invention.
The microemulsion paraffin remover and inhibitor provided by the invention is characterized in that the fatty acid amide betaine is fatty acid amide propyl betaine. Examples of fatty acid amide propyl betaines suitable for use in the present invention include, but are not limited to: oleic acid amidopropyl betaine, stearic acid amidopropyl betaine, and lauric acid amidopropyl betaine. In some embodiments, the fatty acid amide betaine is oleamidopropyl betaine.
The microemulsion paraffin remover and inhibitor provided by the invention can be used for removing the paraffin in the microemulsion, wherein the fatty acid glycol amide can be fatty acid diethanolamide. Examples of fatty acid diethanolamides suitable for use in the present invention include, but are not limited to: oleic acid diethanolamide, stearic acid diethanolamide and lauric acid diethanolamide. In some embodiments, the fatty acid glycol amide is oleic acid diethanolamide.
The microemulsion paraffin remover and inhibitor provided by the invention is characterized in that the cosolvent is ethylene glycol butyl ether and/or diethylene glycol monopropyl ether. The ethylene glycol butyl ether and/or diethylene glycol monopropyl ether are/is used as a cosolvent, so that the dissolving efficiency and the dissolving effect of each component can be improved.
The microemulsion paraffin removal and prevention agent provided by the invention comprises or consists of the following components in percentage by weight: 10 to 30 percent of condensate oil, 5 to 20 percent of ethylene glycol butyl ether and/or diethylene glycol monopropyl ether, 7 to 15 percent of isomeric tridecanol ether carboxylate, 7 to 15 percent of oleic acid amide propyl betaine, 5 to 10 percent of oleic acid diethanol amide, 5 to 10 percent of isomeric tridecanol polyoxyethylene ether and 20 to 70 percent of water. In the invention, the isomeric tridecanol ether carboxylate, the oleic acid amide propyl betaine, the oleic acid diethanol amide and the isomeric tridecanol polyoxyethylene ether are compounded, so that irritant gas is not volatilized in the use process of the microemulsion paraffin remover, and the microemulsion paraffin remover is safe to human bodies and environment.
In some preferred embodiments, the microemulsion paraffin remover and inhibitor comprises or consists of the following components in percentage by weight: 15 to 25 percent of condensate oil, 5 to 10 percent of ethylene glycol monobutyl ether and/or diethylene glycol monopropyl ether, 10 to 15 percent of isomeric tridecanol ether carboxylate, 10 to 15 percent of oleic acid amide propyl betaine, 5 to 8 percent of oleic acid diethanol amide, 5 to 10 percent of isomeric tridecanol polyoxyethylene ether and 30 to 50 percent of water; and in some preferred embodiments, the microemulsion paraffin remover/inhibitor comprises or consists of the following components in percentage by weight: 22 to 24 percent of condensate oil, 5 to 6 percent of ethylene glycol butyl ether and/or diethylene glycol monopropyl ether, 14 to 15 percent of isomeric tridecanol ether carboxylate, 14 to 15 percent of oleic acid amide propyl betaine, 5 to 6 percent of oleic acid diethanol amide, 7 to 9 percent of isomeric tridecanol polyoxyethylene ether and 30 to 32 percent of water.
In a second aspect, the present invention provides a preparation method of a microemulsion paraffin remover and inhibitor, wherein the preparation method comprises the following steps: mixing the oil phase, fatty alcohol ether acid salt, fatty alcohol polyether, fatty acid amide betaine, fatty acid glycol amide, cosolvent and water to prepare the microemulsion paraffin remover and inhibitor.
In some embodiments, the method of preparation comprises the steps of:
s100, adding the oil phase, the fatty alcohol ether acid salt, the fatty alcohol polyether and the fatty acid glycol amide into water, and mixing to obtain a mixture A;
s200, adding a cosolvent into the mixture A, and mixing to obtain a mixture B;
and S300, adding fatty acid amide betaine into the mixture B, and mixing to obtain the microemulsion paraffin removal and prevention agent.
In a third aspect, the invention also provides the application of the microemulsion paraffin removal and prevention agent in oil pipe paraffin removal.
The invention has the following advantages:
(1) In the invention, fatty alcohol ether acid salt, fatty acid amide betaine, fatty acid glycol amide, fatty alcohol polyether and cosolvent are compounded and dissolved in oil phase such as condensate oil to prepare the oil-in-water microemulsion-microemulsion paraffin remover and inhibitor. In the microemulsion type wax removing and preventing agent, fatty alcohol hydrochloride (such as isomeric tridecanol ether carboxylate) and fatty acid amide betaine (such as oleamide propyl betaine) can play a role in wetting inversion, so that the wax deposition surface is inverted from an oleophylic surface to a hydrophilic surface, and the wax can fall off. At the same time, the penetration of these substances can weaken the adhesive force between the wax molecules and the pipe wall, thereby facilitating the removal of the wax molecules from the pipe wall.
The microemulsion paraffin removal and prevention agent has the advantages of high wax dissolution rate (up to more than 0.023 g/min) and high wax prevention rate (up to more than 80%) of an oil-soluble paraffin removal and prevention agent, can effectively prevent oil wells from being waxed, and has good paraffin removal and prevention effect. Moreover, due to the wax removing and preventing agentThe external phase is water, and has the safety of a water-soluble wax removing and preventing agent, so that the wax removing and preventing agent is not easy to burn and explode. Furthermore, the microemulsion paraffin removal and prevention agent is close to neutrality in whole, does not have strong acidity or alkalinity, does not corrode oil extraction equipment, and has high safety. In addition, the microemulsion paraffin removal and prevention agent has higher relative density (more than 0.92 g/cm) 3 ) The high-water-content oil well can be added from a casing, and the use is convenient.
(2) The preparation method of the microemulsion paraffin removal and prevention agent has simple and convenient operation and simple process, is very beneficial to industrial production, and is convenient for on-site preparation.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention in any way.
The raw materials used in the following examples and comparative examples are shown in Table 1.
TABLE 1 raw materials
The preparation method of the isomeric tridecanol ether carboxylate comprises the following steps:
adding 100g of isomeric alcohol ether 1307, 8.13g of NaOH, 2g of Pd/C catalyst and 400g of water into a high-pressure reaction kettle, heating to 80 ℃, introducing oxygen for reaction until the pressure does not decrease within 30min, finishing the reaction, discharging, and filtering to obtain a crude product.
Under the condition of stirring, adding 20 percent by mass of hydrochloric acid aqueous solution into the crude product, adjusting the pH value to be below 3, heating at 90 ℃ to promote oil-water separation, collecting an oil phase, washing, adding NaOH solution to adjust the pH value to be 8-9, and preparing the isomeric tridecanol ether carboxylate.
In addition, the raw materials used in the examples and comparative examples are, if not particularly limited, those disclosed in the prior art, and may be, for example, obtained as they are or prepared according to the production methods disclosed in the prior art.
Example 1
The microemulsion paraffin remover and inhibitor of the embodiment comprises the following components in percentage by weight: 15% of condensate oil, 8% of ethylene glycol butyl ether, 12% of isomeric tridecanol ether carboxylate, 5% of oleic acid diethanol amide, 12% of oleic acid amide propyl betaine, 5% of isomeric tridecanol polyoxyethylene ether and the balance of water.
The microemulsion paraffin remover and inhibitor is prepared according to the following method.
1) Adding the condensate oil, the isomeric tridecanol ether carboxylate, the oleic acid diethanolamide and the isomeric tridecanol polyoxyethylene ether into deionized water according to a proportion, and stirring to uniformly mix to obtain a mixture A;
2) Adding ethylene glycol monobutyl ether into the mixture A according to a proportion, and stirring to uniformly mix to obtain a mixture B;
3) And (3) under the stirring condition, dropwise adding the oleamide propyl betaine into the mixture B, and stirring until the mixture B is uniformly mixed to obtain the microemulsion paraffin removal and prevention agent.
Example 2
The microemulsion paraffin remover and inhibitor of the embodiment comprises the following components in percentage by weight: the oil-water separation and purification system comprises 18% of condensate oil, 8% of ethylene glycol butyl ether, 13% of isomeric tridecanol ether carboxylate, 5% of oleic acid diethanol amide, 14% of oleic acid amide propyl betaine, 7% of isomeric tridecanol polyoxyethylene ether and the balance of water.
The microemulsion paraffin remover and inhibitor is prepared according to the following method.
1) Adding the condensate oil, the isomeric tridecanol ether carboxylate, the oleic acid diethanolamide and the isomeric tridecanol polyoxyethylene ether into deionized water according to a proportion, and stirring to uniformly mix to obtain a mixture A;
2) Adding butyl cellosolve into the mixture A in proportion, and stirring to mix uniformly to obtain a mixture B;
3) And (3) under the stirring condition, dropwise adding the oleamide propyl betaine into the mixture B, and stirring until the mixture B is uniformly mixed to obtain the microemulsion paraffin removal and prevention agent.
Example 3
The microemulsion paraffin remover and inhibitor of the embodiment comprises the following components in percentage by weight: 23% of condensate oil, 5% of ethylene glycol butyl ether, 14% of isomeric tridecanol ether carboxylate, 5% of oleic acid diethanol amide, 15% of oleic acid amide propyl betaine, 8% of isomeric tridecanol polyoxyethylene ether and the balance of water.
The microemulsion paraffin remover and inhibitor is prepared according to the following method.
1) Adding the condensate oil, the isomeric tridecanol ether carboxylate, the oleic acid diethanolamide and the isomeric tridecanol polyoxyethylene ether into deionized water according to a proportion, and stirring to uniformly mix to obtain a mixture A;
2) Adding ethylene glycol monobutyl ether into the mixture A according to a proportion, and stirring to uniformly mix to obtain a mixture B;
3) And (3) dropwise adding the oleamidopropyl betaine into the mixture B under the stirring condition, and stirring until the mixture B is uniformly mixed to obtain the microemulsion paraffin removal and prevention agent.
Test 1
The microemulsion paraffin removal and prevention agent for the test consists of the following components in percentage by weight: 23% of condensate oil, 5% of butyl cellosolve, 5% of oleic acid diethanolamide, 15% of oleic acid amidopropyl betaine, 8% of isomeric tridecanol polyoxyethylene ether and the balance of water.
The microemulsion paraffin remover and inhibitor is prepared according to the following method.
1) Adding the condensate oil, oleic acid diethanolamide and isomeric tridecanol polyoxyethylene ether into deionized water according to a certain proportion, and stirring to uniformly mix to obtain a mixture A;
2) Adding butyl cellosolve into the mixture A in proportion, and stirring to mix uniformly to obtain a mixture B;
3) And (3) dropwise adding the oleamidopropyl betaine into the mixture B under the stirring condition, and stirring until the mixture B is uniformly mixed to obtain the microemulsion paraffin removal and prevention agent.
Test 2
The microemulsion paraffin removal and prevention agent for the test consists of the following components in percentage by weight: 23% of condensate oil, 5% of ethylene glycol butyl ether, 14% of isomeric tridecanol ether carboxylate, 5% of oleic acid diethanol amide, 8% of isomeric tridecanol polyoxyethylene ether and the balance of water.
The microemulsion paraffin remover and inhibitor is prepared according to the following method.
1) Adding condensate oil, isomeric tridecanol ether carboxylate, oleic acid diethanolamide and isomeric tridecanol polyoxyethylene ether into deionized water in proportion, and stirring to mix uniformly to obtain a mixture A;
2) And adding ethylene glycol monobutyl ether into the mixture A according to a proportion, and stirring to uniformly mix to obtain the microemulsion paraffin removal and prevention agent.
Test 3
The microemulsion paraffin removal and prevention agent for the test consists of the following components in percentage by weight: 23% of condensate oil, 5% of ethylene glycol butyl ether, 14% of isomeric tridecanol ether carboxylate, 5% of oleic acid diethanol amide, 15% of oleic acid amide propyl betaine and the balance of water.
The microemulsion paraffin remover and inhibitor is prepared according to the following method.
1) Adding the condensate oil, the isomeric tridecanol ether carboxylate and the oleic acid diethanol amide into deionized water according to a proportion, and stirring to uniformly mix to obtain a mixture A;
2) Adding ethylene glycol monobutyl ether into the mixture A according to a proportion, and stirring to uniformly mix to obtain a mixture B;
3) And (3) dropwise adding the oleamidopropyl betaine into the mixture B under the stirring condition, and stirring until the mixture B is uniformly mixed to obtain the microemulsion paraffin removal and prevention agent.
Performance testing
The microemulsion paraffin removal and prevention agent prepared in the examples 1 to 3 is used for measuring the density of a product according to a test method in GB/T2013-2010 liquid petrochemical product densitometry, measuring the paraffin dissolution rate of the product by using No. 58 paraffin according to a test method in SY/T6300-2009 paraffin removal and prevention agent technical conditions for oil extraction, and measuring the paraffin prevention rate of the product in crude oil of a certain oil field, wherein the paraffin content in the crude oil is 18.75%, and the paraffin prevention rate is calculated according to a formula (1).
In the formula:
e: the wax control rate is expressed by percentage;
m 0 : wax precipitation of oil sample without adding clear wax-proof agentAmounts in grams (g);
m: the wax precipitation amount of the oil sample added with the wax removing and preventing agent is gram (g).
The test results of the microemulsion paraffin remover and inhibitor of examples 1 to 3 are shown in table 2. In addition, example 1 of the chinese patent application CN105255468A was used as comparative example 1, an oil-soluble type wax remover consisting of 90 wt% of 150 # solvent oil and 10 wt% of diethylene glycol butyl ether was used as comparative example 2, and the wax removing performance index of the chinese patent application CN104371685A was used as comparative example 3, and the results are shown in table 2.
TABLE 2 clear wax control agent Properties
| Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | |
| Density, g/cm 3 | 0.94 | 0.93 | 0.92 | 0.95 | 0.82 | 0.087 |
| Wax dissolution rate, g/min | 0.023 | 0.025 | 0.028 | 0.022 | 0.014 | 0.016 |
| Wax control rate% | 80 | 82 | 85 | 75 | 66 | 55 |
As can be seen from Table 2, the wax removing and preventing effects of the microemulsion wax removing and preventing agents in examples 1, 2 and 3 are better than those of comparative examples 1 to 3, and the microemulsion wax removing and preventing agent in example 3 has the best wax removing and preventing effect. The micro-emulsion wax removing and preventing agent has the wax dissolving rate of over 0.023g/min and the wax preventing rate of over 80 percent, can effectively prevent oil wells from waxing and has good wax removing and preventing effect. The density of the microemulsion paraffin removal and prevention agent is more than 0.92g/cm 3 The high water content oil well can be added from the casing, and is easy to sink at the bottom of the well, and the use is very convenient.
The wax-dissolving rate and the wax-proofing rate of the wax-removing and anti-blocking agents of tests 1 to 3 were measured by the same method, and the results are shown in Table 3. In the tests 1 to 3, one of isomeric tridecanol ether carboxylate, oleamide propyl betaine and isomeric tridecanol polyoxyethylene ether is not used.
TABLE 3 Paraffin remover properties for example 3 and runs 1-3
| Examples | Experimental example 3 | Test 1 | Test 2 | Test 3 |
| Rate of wax dissolution, g/min | 0.028 | 0.017 | 0.015 | 0.018 |
| Percent wax control ratio% | 85 | 53 | 50 | 55 |
As is clear from Table 3, the wax removing and preventing effects of the wax removing and preventing agents of tests 1 to 3 are all inferior to those of experiment example 3, and the wax removing and preventing effect of experiment example 3 is the best. The results show that the combined action of the isomeric tridecanol ether carboxylate, the oleic acid amide propyl betaine and the isomeric tridecanol polyoxyethylene ether is beneficial to improving the wax dissolution rate and the wax control rate of the high-definition wax inhibitor
Interfacial tension
An American TX500C rotary droplet interfacial tension tester is adopted to test the interfacial tension of the clear paraffin inhibitor and crude oil in the experimental example 3, and the temperature (oil reservoir temperature) is tested; rotational speed (4500 rpm/min); oil-water density difference (0.15); test oils (four crude oils); test water (formation water). The results of the interfacial tension test are shown in Table 4.
TABLE 4 surface tension
As can be seen from Table 4, the microemulsion pour point depressant system of the present invention has high interfacial activity, and the surfactant system can form stable ultralow interfacial tension value with Jiangsu crude oil, shengli crude oil, daqing crude oil and crude oil: IFT is less than or equal to 1 x 10 -3 mN/m。
Freezing point
The microemulsion paraffin removal and prevention agent of the experimental example 3 is mixed with the victory crude oil according to the weight ratio of 1.
Therefore, the wax removing and preventing agent can achieve the following effective effects:
(1) The wax dissolving rate is more than 0.02g/min; the wax control rate is more than 80 percent;
(2) Small grain size, low viscosity, high and low temperature resistance, high stability and no delamination after long-term storage;
(3) Specific gravity of more than 0.92g/cm 3 The high-water-content crude oil well can be added from a casing and is easy to sink to the bottom of the well, so that the paraffin removal and prevention effects are achieved;
(4) The surfactant system can form a stable ultralow interfacial tension value with Jiangsu crude oil, shengli crude oil, daqing crude oil and crude oil: IFT is less than or equal to 1 x 10 -3 mN/m；
(5) The freezing point of the crude oil can be effectively reduced;
(6) The wettability of the crude oil and the surface of the oil transportation inner pipe can be effectively improved, and the crude oil and the surface of the oil transportation inner pipe are converted into a hydrophilic interface from an oleophilic interface;
(7) Has paraffin removal and paraffin prevention effects;
(8) The paraffin removal and wax control agent has no corrosiveness and has small corrosiveness on oil extraction equipment.
In addition, the microemulsion paraffin removal and prevention agent is safe to use, has no possibility of combustion and explosion in the use process, and has no acidity or alkalinity and no corrosivity on oil extraction equipment.
Any numerical value mentioned in this specification, if there is only a two unit interval between any lowest value and any highest value, includes all values from the lowest value to the highest value incremented by one unit at a time. For example, if it is stated that the amount of a component, or the value of a process variable such as temperature, pressure, time, etc., is 50 to 90, it is meant in this specification that values of 51 to 89, 52 to 88, 8230, and 69 to 71 and 70 to 71, etc., are specifically enumerated. For non-integer values, units of 0.1, 0.01, 0.001, or 0.0001 may be considered as appropriate. These are only some specifically named examples. In a similar manner, all possible combinations of numerical values between the lowest value and the highest value enumerated are to be considered to be disclosed in this application.
It should be noted that the above-mentioned embodiments are only for explaining the present invention, and do not constitute any limitation to the present invention. The present invention has been described in relation to an exemplary embodiment, and it is understood that the words which have been used herein are words of description and illustration, rather than words of limitation. The invention can be modified, as prescribed, within the scope of the claims and without departing from the scope and spirit of the invention. Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, but rather extends to all other methods and applications having the same functionality.
Claims (10)
1. The microemulsion wax cleaning and preventing agent is characterized by comprising an oil phase, fatty alcohol ether acid salt, fatty alcohol polyether, fatty acid amide betaine, fatty acid glycol amide, a cosolvent and water, wherein the mass ratio of the oil phase, the fatty alcohol ether acid salt, the fatty alcohol polyether, the fatty acid amide betaine, the fatty acid glycol amide, the cosolvent and the water is (10-40): 6-15): 5-20): 3-10: (5-20): 20-70.
2. The microemulsion paraffin remover and inhibitor according to claim 1, wherein the mass ratio of the oil phase, the fatty alcohol glycolate, the fatty alcohol polyether, the fatty acid amide betaine, the fatty acid glycol amide, the cosolvent and water is (10-30): 7-15): 5-10: (5-20): 20-70).
3. The microemulsion paraffin remover and inhibitor according to claim 1 or 2, wherein the oil phase is a condensate oil; and/or
The fatty alcohol ether carboxylate is a fatty alcohol ether carboxylate or a fatty alcohol ether sulfonate, preferably a C8-C18 fatty alcohol ether carboxylate or a C8-C18 fatty alcohol ether sulfonate, and most preferably an isomeric tridecanol ether carboxylate or an isomeric tridecanol ether sulfonate.
4. The microemulsion paraffin remover and inhibitor according to any one of claims 1 to 3, wherein the fatty alcohol polyether is a fatty alcohol polyoxyethylene ether or a fatty alcohol polyoxypropylene ether, preferably a C12-C18 fatty alcohol polyoxyethylene ether or a C12-C18 fatty alcohol polyoxypropylene ether, more preferably isomeric tridecanol polyoxyethylene ether.
5. The microemulsion paraffin remover and inhibitor according to any one of claims 1 to 4, wherein the fatty acid amide betaine is a fatty acid amide propyl betaine, preferably oleamide propyl betaine, stearic acid amide propyl betaine or lauric acid amide propyl betaine.
6. A microemulsion paraffin remover according to any one of claims 1-5, wherein the fatty acid glycol amide is a fatty acid diethanolamide, preferably oleic acid diethanolamide, stearic acid diethanolamide or lauric acid diethanolamide.
7. The microemulsion paraffin remover and inhibitor according to any one of claims 1 to 6, wherein the cosolvent is ethylene glycol butyl ether and/or diethylene glycol monopropyl ether.
8. The microemulsion paraffin remover and inhibitor according to any one of claims 1 to 7, wherein the microemulsion paraffin remover and inhibitor comprises or consists of the following components in percentage by weight: 10 to 30 percent of condensate oil, 5 to 20 percent of ethylene glycol monobutyl ether and/or diethylene glycol monopropyl ether, 7 to 15 percent of isomeric tridecanol ether carboxylate, 7 to 15 percent of oleic acid amide propyl betaine, 5 to 10 percent of oleic acid diethanol amide, 5 to 10 percent of isomeric tridecanol polyoxyethylene ether and 20 to 70 percent of water;
preferably, the microemulsion paraffin remover and inhibitor comprises or consists of the following components in percentage by weight: 15 to 25 percent of condensate oil, 5 to 10 percent of ethylene glycol monobutyl ether and/or diethylene glycol monopropyl ether, 10 to 15 percent of isomeric tridecanol ether carboxylate, 10 to 15 percent of oleic acid amide propyl betaine, 5 to 8 percent of oleic acid diethanol amide, 5 to 10 percent of isomeric tridecanol polyoxyethylene ether and 30 to 50 percent of water.
9. The method for preparing a microemulsion paraffin remover/inhibitor according to any one of claims 1 to 8, wherein the preparation method comprises the following steps: mixing the oil phase, fatty alcohol ether acid salt, fatty alcohol polyether, fatty acid amide betaine, fatty acid glycol amide, cosolvent and water to prepare the microemulsion paraffin remover and inhibitor.
10. Use of the microemulsion paraffin remover of any one of claims 1-8 in paraffin removal of oil pipes.
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Citations (5)
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|---|---|---|---|---|
| DE2612757A1 (en) * | 1976-03-25 | 1977-09-29 | Chemische Fabriek Servo B V | Paraffin crystallisation inhibitor - comprises aq. emulsion of vinyl pyridine copolymer, water, solvent, emulsifier and tall oil |
| CN101668828A (en) * | 2007-04-13 | 2010-03-10 | 巴斯夫欧洲公司 | Production and use of paraffin inhibitor formulations |
| US20170190950A1 (en) * | 2016-01-06 | 2017-07-06 | Ecolab Usa Inc. | Temperature-stable paraffin inhibitor compositions |
| CN108467717A (en) * | 2018-04-26 | 2018-08-31 | 威海翔泽新材料科技有限公司 | Water based dewaxing agent and preparation method thereof |
| WO2020041258A1 (en) * | 2018-08-20 | 2020-02-27 | Locus Oil Ip Company, Llc | Methods for paraffin removal and extended post-primary oil recovery |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2612757A1 (en) * | 1976-03-25 | 1977-09-29 | Chemische Fabriek Servo B V | Paraffin crystallisation inhibitor - comprises aq. emulsion of vinyl pyridine copolymer, water, solvent, emulsifier and tall oil |
| CN101668828A (en) * | 2007-04-13 | 2010-03-10 | 巴斯夫欧洲公司 | Production and use of paraffin inhibitor formulations |
| US20170190950A1 (en) * | 2016-01-06 | 2017-07-06 | Ecolab Usa Inc. | Temperature-stable paraffin inhibitor compositions |
| CN108467717A (en) * | 2018-04-26 | 2018-08-31 | 威海翔泽新材料科技有限公司 | Water based dewaxing agent and preparation method thereof |
| WO2020041258A1 (en) * | 2018-08-20 | 2020-02-27 | Locus Oil Ip Company, Llc | Methods for paraffin removal and extended post-primary oil recovery |
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