CN108467716B - Oil-based paraffin remover - Google Patents
Oil-based paraffin remover Download PDFInfo
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- CN108467716B CN108467716B CN201810262502.XA CN201810262502A CN108467716B CN 108467716 B CN108467716 B CN 108467716B CN 201810262502 A CN201810262502 A CN 201810262502A CN 108467716 B CN108467716 B CN 108467716B
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/16—Facilitating the conveyance of liquids or effecting the conveyance of viscous products by modification of their viscosity
- F17D1/17—Facilitating the conveyance of liquids or effecting the conveyance of viscous products by modification of their viscosity by mixing with another liquid, i.e. diluting
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Abstract
The invention provides an oil-based paraffin removal agentThe agent comprises the following components in parts by weight: 75-85 parts of organic solvent, 15-25 parts of cosolvent, 0.5-1.2 parts of penetrating agent and 1-3.5 parts of solubilizer. The oil-based paraffin remover disclosed by the invention is easy to obtain raw materials, and the specific gravity is higher than 0.85g/cm3The flash point is higher than 60 ℃, and substances such as S, Cl and the like are not contained, thereby being beneficial to transportation, storage and site safety construction. In addition, the oil-based wax remover has the wax dissolving rate of 0.040g/min to 0.056g/min at 45 ℃, and has higher wax dissolving rate on the basis of safe use.
Description
Technical Field
The invention belongs to the field of oilfield chemical engineering, and particularly relates to an oil-based paraffin remover, and more particularly relates to a high-flash-point oil-based paraffin remover with strong environmental friendliness.
Background
The wax deposition of an oil well is a phenomenon commonly existing in the development of the oil field, particularly, the wax content is high in the process of thick oil exploitation, the wax contained in crude oil is gradually separated out along with the reduction of pressure and temperature in the exploitation process, the paraffin deposited in an oil well pipe column and a ground oil collecting pipeline can cause the reduction and even blockage of the effective sectional area of the pipeline, the pump efficiency is reduced, the liquid production amount of the oil well is reduced, a sucker rod can be broken due to overload (the ascending load and the descending resistance are increased), the back pressure of the oil well is increased, and the problems that the power consumption of the oil pumping unit is increased, the failure rate is increased. The problem of paraffin deposition is an important problem in the process of oil exploitation and gathering and transportation. The economic losses due to paraffin deposition and the costs for paraffin deposition control are as high as billions of dollars each year around the world.
In order to ensure the smooth operation of crude oil extraction and gathering, wax removal and prevention are required for the wax-precipitation oil well. The chemical method for paraffin removal and prevention of oil well is a widely applied method in oil field at present. The most popular is the paraffin removal technique using a paraffin remover. For example, water-based paraffin cleaners based on surfactants and mutual solvents are described in U.S. patent publication nos. US3481870A, US3077929A, US3422265A and US4380268A, US6176243B1 and uk patent publication No. GB 1178137A. The water-based paraffin remover has a certain paraffin control effect, but has low paraffin dissolution rate and high density, and can invade a near wellbore zone to cause formation damage. The oil-based paraffin remover has good popularization prospect due to high paraffin dissolving rate and good effect, but still has two problems: the oil-based paraffin remover has low flash point, for example, Chinese patent documents with publication numbers of CN1076002A and CN1560175A disclose oil-based paraffin removers, but the components of the paraffin remover contain industrial solvent oil and petroleum ether, the flash point is lower than 0 ℃, and the safety of the construction process is poor; second, the general CS2、CH3Cl, mixed benzene or crude benzene, for example, Chinese patent publication No. CN102492408A discloses a detergent for removing dirt, oil and wax, which contains chloroform, has strong pungent odor, is not only harmful to human body, but also contains high-sulfur and chlorine corrosive compounds, which can cause corrosion in the subsequent processing of crude oil, cause catalyst poisoning in oil refining process, and has high price and polluted waste liquid, thus the use of the detergent is limited.
Therefore, how to enhance the safety of the paraffin remover and improve the environmental protection performance thereof is a major problem in the research work of the paraffin remover at present.
Disclosure of Invention
The invention aims to provide a high-flash-point oil-based paraffin remover with strong environmental protection property, so as to solve the problems in the prior art.
The oil-based paraffin remover comprises the following components in parts by weight: 75-85 parts of organic solvent, 15-25 parts of cosolvent, 0.5-1.2 parts of penetrating agent and 1-3.5 parts of solubilizer.
Wherein, according to the weight portion, include: 75-80 parts of organic solvent, 20-22 parts of cosolvent, 0.8-1 part of penetrating agent and 2.5-3 parts of solubilizer.
Wherein, according to the weight portion, include: 78 parts of an organic solvent, 21 parts of a cosolvent, 1 part of a penetrant, and 3 parts of a solubilizer.
Wherein the organic solvent is isoparaffin solvent oil with 6 to 8 carbon atoms on the main chain.
Wherein the isoparaffin solvent oil with the carbon number of 6 to 8 on the main chain is any one or more of 2, 2-dimethyl-3-ethylhexane, 2,3, 5-trimethyl-4-propylheptane and 2,2,5, 6-tetramethyl-4-ethyloctane.
Wherein the cosolvent is ethylene glycol ethyl ether acetate and/or ethylene glycol phenyl ether.
Wherein the penetrating agent is a nonionic surfactant.
Wherein the nonionic surfactant is polyoxyethylene octyldecanol.
Wherein the solubilizer is propylene glycol.
Wherein the density of the oil-based paraffin remover is 0.85g/cm3To 0.95g/cm3The wax dissolving rate is 0.040 g/min-0.056 g/min at 45 deg.C, the flash point of opening is greater than 60 deg.C, and the solidifying point is less than-40 deg.C.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the oil-based paraffin remover disclosed by the invention is easy to obtain raw materials, and the specific gravity is higher than 0.85g/cm3The flash point is higher than 60 ℃, and substances such as S, Cl and the like are not contained, thereby being beneficial to transportation, storage and site safety construction. In addition, the oil base of the present inventionThe wax-dissolving rate of the wax remover at 45 ℃ is 0.040 g/min-0.056 g/min, and the wax remover has higher wax-dissolving rate on the basis of safe use.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention. The process of the present invention employs conventional methods or apparatus in the art, except as described below. Unless otherwise indicated, terms referred to in the present invention have meanings commonly understood by those skilled in the art.
The paraffin remover is a chemical preparation capable of removing wax deposits and can be divided into an oil-based paraffin remover, a water-based paraffin remover and an oil-in-water type paraffin remover, wherein the paraffin remover is generally used for removing wax scale in an oil pipe of an oil field and an oil well, dredging the oil pipe and improving the oil yield. Wherein, the oil-based paraffin remover is a paraffin remover with stronger paraffin dissolving capacity. At present, the oil-based wax remover generally has the defects of poor wax dissolving effect, poor safety, harm to human bodies and easy environmental pollution. Aiming at the problems, the inventor optimizes the components and the component content of the oil-based paraffin remover through research, thereby providing the high-flash-point oil-based paraffin remover with strong environmental protection and remarkable paraffin dissolving effect.
Specifically, the oil-based paraffin remover comprises the following components in parts by weight: 75-85 parts of organic solvent, 15-25 parts of cosolvent, 0.5-1.2 parts of penetrating agent and 1-3.5 parts of solubilizer. Preferably, the oil-based paraffin remover comprises the following components in parts by weight: 75-80 parts of organic solvent, 20-22 parts of cosolvent, 0.8-1 part of penetrating agent and 2.5-3 parts of solubilizer. More preferably, the oil-based paraffin remover comprises the following components in parts by weight: 78 parts of an organic solvent, 21 parts of a cosolvent, 1 part of a penetrant, and 3 parts of a solubilizer.
According to the invention, the organic solvent, the cosolvent, the penetrating agent and the solubilizer are compounded according to a specific proportion, and the components generate a synergistic effect, so that the wax dissolving effect is promoted.
The organic solvent is capable of dissolving wax in the well quickly and relatively completely, which coalesces due to temperature and pressure. Preferably, the organic solvent is isoparaffin solvent oil with 6 to 8 carbon atoms on the main chain. The inventors found through research that when the oil-based paraffin remover of the present invention employs isoparaffin mineral spirit having 6 to 8 carbon atoms in the main chain as an organic solvent, the oil-based paraffin remover can have a better removing effect on microcrystalline wax having a higher branching degree, which is difficult to treat by conventional paraffin removers, through synergistic effects with a cosolvent, a penetrating agent and a solubilizer. More preferably, the organic solvent is any one or more of 2, 2-dimethyl-3-ethylhexane, 2,3, 5-trimethyl-4-propylheptane and 2,2,5, 6-tetramethyl-4-ethyloctane. Conventionally commercially available 2, 2-dimethyl-3-ethylhexane, 2,3, 5-trimethyl-4-propylheptane and 2,2,5, 6-tetramethyl-4-ethyloctane can be used in the present invention.
The cosolvent has good miscibility and can form a uniform and stable system by the organic solvent, the penetrating agent and the solubilizer. Preferably, the cosolvent can adopt the combination of ethylene glycol monoethyl ether acetate, ethylene glycol phenyl ether, ethylene glycol monoethyl ether acetate and ethylene glycol phenyl ether, and the combination has the characteristics of low volatility and strong permeability, and can better increase the dissolving capacity of the organic solvent to the complex wax sample and increase the wax dissolving rate and the wax dissolving amount.
The penetrant has the functions of penetrating and promoting dispersion. Preferably, the penetrant is a nonionic surfactant. When the wax sample is dissolved by using the organic solvent, the addition of a proper amount of the nonionic surfactant can penetrate into the deep part of the wax sample to promote the high-concentration organic solvent to diffuse towards the low-concentration direction and promote the dissolution of the wax sample. One particularly preferred nonionic surfactant is polyoxyethylene octyldecanol ether. Conventional commercially available polyoxyethylene octyldecanol ethers can be used in the present invention.
The solubilizer acts as a solubiliser. The solubilizer is preferably an alcohol, more preferably propylene glycol, and conventional commercially available propylene glycol can be used in the present invention. Since the wax sample contains polar components and nonpolar components, and the organic solvent used in the present invention is a nonpolar solvent, the wax sample can be completely dissolved by using the alcohol and the organic solvent in combination according to the principle of similar solubility using propylene glycol as a solubilizer. In addition, the solubilizer adopted by the invention does not contain sulfur and chlorine, has high flash point, can be dissolved in both water phase and oil phase, and can obviously increase the mutual solubility of the oil phase and the water phase.
The specific gravity of the oil-based paraffin remover is higher than 0.85g/cm through the synergistic effect of the organic solvent, the cosolvent, the penetrating agent and the solubilizer3The flash point is higher than 60 ℃, thereby being beneficial to transportation, storage and site safety construction; the oil-based wax remover is determined to have a wax dissolving rate of 0.040 g/min-0.056 g/min at 45 ℃ according to SY/T6300-2009 standard, which is obviously higher than the lowest value of 0.016g/min in the standard, so that the oil-based wax remover has a higher wax dissolving rate on the basis of safe use; in addition, the raw materials adopted by the oil-based paraffin remover are easy to obtain and have higher safety, so that the oil-based paraffin remover does not contain S, Cl and other substances, and is harmless to human bodies and the environment.
The oil-based paraffin remover can be prepared by uniformly mixing by adopting a common method. For example, according to the proportion, the organic solvent and the cosolvent are added into a mixer, stirred for 5min at the speed of 1000r/min, then the solubilizer is added, the stirring is continued for 5min, then the penetrating agent is added, and the stirring is continued for 5min, thus obtaining the oil-based paraffin remover.
Examples
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
The wax samples in the following examples were obtained from TK915 well of Tahe oil field, and contained 0.13 wt% of formation scale insolubles, 72.47 wt% of saturated alkanes (peak alkane distribution C57-C60), 7.49 wt% of aromatic hydrocarbons, and 20.78 wt% of colloid asphaltenes, wherein the C35+ content is 27.5%.
The sources of each of the materials used in the following examples are as follows:
| substance(s) | Source and model |
| 2, 2-dimethyl-3-ethylhexane | Exxonmobil Isopar L-type solvent oil |
| 2,3, 5-trimethyl-4-propylheptane | Exxonmobil Isopar L-type solvent oil |
| 2,2,5, 6-tetramethyl-4-ethyloctane | Exxonmobil Isopar L-type solvent oil |
| Ethylene glycol Ether acetate | Jiangmen apple chemical Co Ltd |
| Ethylene glycol phenyl ether | Hezhou Huanyuan chemical Co., Ltd |
| Polyoxyethylene octyldecanol ether | Wuhan Dahuawei pharmaceutical chemical Co Ltd |
| Propylene glycol | Shandong-Xiya chemical industry Co., Ltd |
The assay methods used in the following examples are as follows:
specific gravity: GB/T4472 measurement of density and relative density of chemical products
Flash point (i.e. open flash point): GB/T3536-2008 & lt & ltdetermination of flash point and burning point of petroleum product & gt Cleveland open cup method & gt
Wax dissolution rate at 45 ℃: SY/T6300-2009 standard
Example 1
The composition of the oil-based paraffin remover of this example is shown in table 1.
The preparation method of the oil-based paraffin remover comprises the following steps: adding 75g of 2,2,5, 6-tetramethyl-4-ethyloctane and 22g of ethylene glycol ethyl ether acetate into a mixer, stirring for 5min at 1000r/min, adding 2.5g of propylene glycol, continuing to stir for 5min, adding 0.5g of octyl and decyl alcohol polyoxyethylene ether, and continuing to stir for 5min to obtain the oil-based paraffin remover.
The properties of the oil-based paraffin remover of this example are shown in table 2.
Examples 2 to 7
The compositions of examples 2 to 7 are shown in table 1. The preparation method is the same as that of example 1, and the differences are only that the specific substances and the proportions of the organic solvent, the cosolvent, the penetrating agent and the solubilizer are correspondingly adjusted according to the following table 1.
The properties of the oil-based paraffin cleaners of examples 2 to 7 are shown in table 2.
Comparative example 1
The composition of the paraffin remover of comparative example 1 was: 75g of 2,2,5, 6-tetramethyl-4-ethyl octane, 0.5g of octyl and decyl alcohol polyoxyethylene ether and 2.5g of propylene glycol.
The preparation method of the paraffin remover of comparative example 1 comprises the following steps: adding 75g of 2,2,5, 6-tetramethyl-4-ethyloctane into a mixer, adding 2.5g of propylene glycol, stirring for 5min at 1000r/min, adding 0.5g of octyl-decyl alcohol polyoxyethylene ether, and continuously stirring for 5min to obtain the paraffin remover of the comparative example 1.
The performance of the paraffin remover of comparative example 1 is shown in table 2.
Comparative example 2
The composition of the paraffin remover of comparative example 2 was: 96.5g of 2,2,5, 6-tetramethyl-4-ethyloctane, 1g of a penetrating agent F341 (fluorine carbon surfactant, Hangzhou Naucao technologies Co., Ltd.), and 2.5g of a solubilizing agent which is a mixture of n-octanol and n-pentanol in a ratio of 20:1 (w/w).
The preparation method of the paraffin remover of comparative example 2 comprises the following steps: adding 96.5g of 2,2,5, 6-tetramethyl-4-ethyloctane into a mixer, adding 2.5g of a mixture of n-octanol and n-pentanol, stirring for 5min at 1000r/min, adding 1g of penetrating agent F341, and continuing stirring for 5min to obtain the paraffin remover of the comparative example 2.
The performance of the paraffin remover of comparative example 2 is shown in table 2.
Table 1 units: keke (Chinese character of 'Keke')
TABLE 2
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other substitutions, modifications, combinations, changes, simplifications, etc., which are made without departing from the spirit and principle of the present invention, should be regarded as equivalent substitutions, and are included in the scope of the present invention.
Claims (4)
1. The oil-based paraffin remover is characterized by comprising the following components in parts by weight: 75-85 parts of organic solvent, 15-25 parts of cosolvent, 0.5-1.2 parts of penetrating agent and 1-3.5 parts of solubilizer;
wherein the organic solvent is any one or more of 2, 2-dimethyl-3-ethylhexane, 2,3, 5-trimethyl-4-propylheptane and 2,2,5, 6-tetramethyl-4-ethyloctane;
wherein the cosolvent is ethylene glycol ethyl ether acetate and/or ethylene glycol phenyl ether;
wherein the penetrating agent is polyoxyethylene octyldecanol ether;
wherein the solubilizer is propylene glycol.
2. The oil-based paraffin remover according to claim 1, comprising, in parts by weight: 75-80 parts of organic solvent, 20-22 parts of cosolvent, 0.8-1 part of penetrating agent and 2.5-3 parts of solubilizer.
3. The oil-based paraffin remover according to claim 1, comprising, in parts by weight: 78 parts of an organic solvent, 21 parts of a cosolvent, 1 part of a penetrant, and 3 parts of a solubilizer.
4. The oil-based paraffin remover according to any one of claims 1 to 3, wherein the density of the oil-based paraffin remover is 0.85g/cm3To 0.95g/cm3The wax dissolving rate is 0.040 g/min-0.056 g/min at 45 deg.C, the flash point of opening is greater than 60 deg.C, and the solidifying point is less than-40 deg.C.
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| CN113930225B (en) * | 2021-10-22 | 2022-09-30 | 中国石油化工股份有限公司 | Wax crystal dispersing agent for reviving high-wax-content condensate gas reservoir and preparation method thereof |
| CN116200177A (en) * | 2021-11-30 | 2023-06-02 | 天津大港油田滨港集团博弘石油化工有限公司 | High-flash-point environment-friendly oil-based paraffin remover without aromatic hydrocarbon |
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| CN1560175A (en) * | 2004-02-25 | 2005-01-05 | 石油大学(华东) | Clear type high-efficient paraffin removal agent |
| CN102146281A (en) * | 2011-01-25 | 2011-08-10 | 中国石油天然气股份有限公司 | Oil-soluble paraffin-removal viscosity reducer |
| CN104946222A (en) * | 2014-03-24 | 2015-09-30 | 中国石油化工股份有限公司 | Oil-base paraffin remover for oil wells |
| CN105419759A (en) * | 2015-12-24 | 2016-03-23 | 陕西延安石油天然气有限公司 | High-effective environment-friendly oil-based wax removal agent |
| CN105567201A (en) * | 2014-10-09 | 2016-05-11 | 中国石油天然气股份有限公司 | Oil-base paraffin remover for oil well |
| CN107828396A (en) * | 2017-10-24 | 2018-03-23 | 中国石油天然气股份有限公司 | High flash point environment-friendly paraffin remover |
-
2018
- 2018-03-28 CN CN201810262502.XA patent/CN108467716B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1560175A (en) * | 2004-02-25 | 2005-01-05 | 石油大学(华东) | Clear type high-efficient paraffin removal agent |
| CN102146281A (en) * | 2011-01-25 | 2011-08-10 | 中国石油天然气股份有限公司 | Oil-soluble paraffin-removal viscosity reducer |
| CN104946222A (en) * | 2014-03-24 | 2015-09-30 | 中国石油化工股份有限公司 | Oil-base paraffin remover for oil wells |
| CN105567201A (en) * | 2014-10-09 | 2016-05-11 | 中国石油天然气股份有限公司 | Oil-base paraffin remover for oil well |
| CN105419759A (en) * | 2015-12-24 | 2016-03-23 | 陕西延安石油天然气有限公司 | High-effective environment-friendly oil-based wax removal agent |
| CN107828396A (en) * | 2017-10-24 | 2018-03-23 | 中国石油天然气股份有限公司 | High flash point environment-friendly paraffin remover |
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