CN109181666B - Recyclable novel paraffin remover and preparation and recovery methods thereof - Google Patents
Recyclable novel paraffin remover and preparation and recovery methods thereof Download PDFInfo
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- CN109181666B CN109181666B CN201811070653.1A CN201811070653A CN109181666B CN 109181666 B CN109181666 B CN 109181666B CN 201811070653 A CN201811070653 A CN 201811070653A CN 109181666 B CN109181666 B CN 109181666B
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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
Abstract
The invention relates to a chemical product used in an oil field, and provides a recyclable novel paraffin remover and a preparation and recovery method thereof, wherein the recyclable novel paraffin remover comprises 10-90% of main agent dimethyl ether, 6-10% of mutual solvent, 1-4% of surfactant and the balance of water by mass percent. And provides a preparation method and a recovery method for a recyclable novel paraffin remover. The invention provides a recyclable novel paraffin remover, which has the advantages that: the main agent and the water are mixed and dissolved in any proportion when the content of the mutual solvent is more than 6 percent, and can be compounded according to the requirement; has the characteristic of recycling; the wax dissolving performance is excellent; the paint does not contain benzene organic solvents, is green and environment-friendly and has no toxicity; the wax removal and the wax prevention effects are achieved; the method is suitable for oil wells with different mineralization degrees, temperatures and oil sample densities; the product is neutral and does not corrode oil pipes.
Description
Technical Field
The invention relates to a chemical product used in oil field, and provides a recyclable novel paraffin remover and a preparation and recovery method thereof.
Background
Three major problems exist in the oil extraction process: sand production, scaling and wax deposition, which bring many troubles to the extraction and construction of crude oil. In the process of exploitation, the wax-containing crude oil rises along an oil pipe, and with the change of environmental conditions such as temperature, pressure, flow velocity, water content and the like, paraffin molecules in the wax crude oil are broken due to the dissolution balance and can be crystallized and separated out, and the paraffin molecules are intensively deposited on the inner wall of the oil pipe. The deposition of paraffin on the inner wall of the oil pipe inevitably causes the reduction of an oil flow channel and the increase of flow resistance, so that the productivity of the oil well is reduced, and even the production is stopped. In order to solve this problem, many coping methods have been developed, and among them, the chemical wax removal and prevention technology is well received and widely adopted due to its characteristics of wide adaptability, high efficiency, simple operation process, etc.
The chemical paraffin removing agent has many kinds, which are mainly divided into oil-based paraffin removing agent, water-based paraffin removing agent and emulsion type paraffin removing agent, and the common paraffin removing agent has a common defect of being unrecoverable, so that the use cost is increased. The invention provides a recyclable novel paraffin remover and a preparation and recovery method thereof.
Disclosure of Invention
In order to reduce industrial cost and protect environment, the invention develops a novel recyclable paraffin remover, which can realize the function of the conventional paraffin remover under the underground high-pressure working condition, and the novel recyclable paraffin remover can be vaporized under low pressure to be convenient for recovery, so that the novel recyclable paraffin remover has the excellent characteristics of green, safety and recoverability, and can achieve better paraffin removal and prevention effects.
In order to achieve the purpose, the technical scheme of the novel recyclable paraffin remover comprises the following steps:
a novel paraffin remover with recoverability comprises the following components in percentage by weight:
the main agent of one of the recyclable novel paraffin removal agents is dimethyl ether, the effect of the dimethyl ether is to dissolve paraffin, so that wax scale condensed on the inner wall of an oil pipe is dissolved or falls off from the inner wall of the oil pipe, the dimethyl ether has unique physical and chemical properties, the saturated vapor pressure of the dimethyl ether is 0.5Mpa at normal temperature, the dimethyl ether exists in a liquid state under the high-pressure environment of an oil field, and the dimethyl ether has very excellent paraffin dissolving performance through visual experiments. After the dimethyl ether and the petroleum are mixed and dissolved, the dimethyl ether and the petroleum can be separated and recovered through pressure reduction, and can be repeatedly used.
The surface active agent is used for wetting and reversing the oleophylic surface into the hydrophilic surface so as to loosen paraffin condensed on the inner wall of the oil pipe, so that dimethyl ether can enter a wax block gap to accelerate the dissolution of wax scale, and the surface active agent enables the wettability of the oil pipe wall to be changed into hydrophilicity so as to inhibit the further generation of the wax scale, play a certain role in wax prevention and accelerate the wax scale to fall off from the inner wall of the oil pipe. The mutual solvent enables the dimethyl ether and the water to be fully mixed and dissolved to form a stable solvent; water is used as a solvent and has a certain flame retardant effect; the density of the novel paraffin remover with recoverability can be changed by adjusting the proportion of water and dimethyl ether, so that the novel paraffin remover with recoverability is fully mixed and dissolved with petroleum at the well bottom.
In order to further improve the wax dissolving effect, the components in the wax removing composition of the invention can be optimized as follows:
a recyclable wax cleaning agent uses oil-soluble or water-soluble surfactant as surfactant in its formula, and the optional agent is SP80, isoamyl alcohol, sodium dodecyl benzene sulfonate, hexadecyl trimethyl ammonium chloride, etc.
A recoverable wax remover features that its mutual solvent can be methanol or alcohol.
The invention also provides a preparation method of the recyclable novel paraffin remover.
The preparation method of the novel recyclable paraffin remover is described by combining the attached drawing 1: under normal pressure, a mixed solution of water, a surfactant and a mutual solvent which are prepared in advance in a fixed amount is added into a reaction kettle (10), then the mixed solution is pressurized to be higher than 0.5Mpa into the reaction kettle (10) through a needle valve (4), then a dimethyl ether reagent in a fixed amount is added into the reaction kettle (10) through a storage tank (5) through a needle valve (11), and the product is obtained after uniform stirring.
The invention also provides a method for recovering the novel recyclable paraffin remover.
The laboratory recovery mode with the novel recyclable paraffin remover is described by combining the accompanying drawing 1: after the wax dissolving reaction is finished, nitrogen is introduced into a reaction kettle (10) through a needle valve (4), a recyclable novel paraffin remover after the reaction is driven into a recovery tank (9) through a needle valve (12), then the pressure in an intermediate container (7) is reduced to 1Mpa through the pressure relief of the needle valve (2), the needle valve (8) is opened to form a pressure difference between the recovery tank (9) and the intermediate container (7), the phase state of the recyclable novel paraffin remover in the recovery tank (9) is changed from liquid state to gas state and enters the intermediate container (7), the pressure in the intermediate container (7) is increased to be higher than 0.5Mpa through the needle valve (2), the phase state of the recyclable novel paraffin remover in the intermediate container (7) is changed from gas state to liquid state at the moment, and the recyclable novel paraffin remover which can be changed into liquid state through the needle valve (6) enters a storage tank (5) for storage, the recovered novel paraffin remover with recoverability is added into a reaction kettle (10) from a storage tank (5) through a needle valve (11) and is repeatedly used.
The invention has the following beneficial effects:
(1) the novel recyclable paraffin remover provided by the invention is prepared from dimethyl ether as a raw material, has excellent recyclable performance due to unique physical and chemical properties, and meets the national requirements on environmental protection and sustainability.
(2) The recyclable novel paraffin remover provided by the invention is prepared from dimethyl ether as a raw material, the paraffin removing efficiency of the recyclable novel paraffin remover exceeds that of most benzene solvents and solvent oil, and the paraffin removing and preventing effects are remarkable.
(3) The recyclable novel paraffin remover provided by the invention adopts dimethyl ether as a raw material, has no toxicity, is safe and harmless to human bodies, and is an excellent substitute for benzene solvents with toxicity in the traditional paraffin remover.
(4) The invention provides a novel recyclable paraffin remover which has double effects of paraffin removal and paraffin prevention, is neutral, and has no harm to oil pipes and stratums.
(5) The invention provides a recyclable novel paraffin remover, which can change the density of the paraffin remover by adjusting the proportion of water and dimethyl ether so that the paraffin remover can be fully mixed with petroleum at the bottom of a well, and can meet the requirements of different oil wells on the paraffin remover.
Drawings
FIG. 1 is a schematic view of a device for preparing and recovering a proprietary reagent of the present invention.
In the figure: wherein 1, 2, 3, 4, 6, 8, 11 and 12 are needle valves, 5 is a storage tank, 7 is an intermediate container, 9 is a recovery tank and 10 is a reaction kettle.
Detailed Description
The recyclable novel paraffin remover comprises, by mass, 10-90% of dimethyl ether, 1-4% of a surfactant, 6-10% of a mutual solvent and the balance of water.
The preparation method of the novel recyclable paraffin remover is described by combining the accompanying drawing 1: under normal pressure, a mixed solution of water, a surfactant and a mutual solvent which are prepared in advance in a fixed amount is added into a reaction kettle (10), then the mixed solution is pressurized to be higher than 0.5Mpa into the reaction kettle (10) through a needle valve (4), then a dimethyl ether reagent in a fixed amount is added into the reaction kettle (10) through a storage tank (5) through a needle valve (11), and the product is obtained after uniform stirring.
The laboratory recovery mode with the novel recyclable paraffin remover is described by combining the accompanying drawing 1: after the wax dissolving reaction is finished, nitrogen is introduced into a reaction kettle (10) through a needle valve (4), a recyclable novel paraffin remover after the reaction is driven into a recovery tank (9) through a needle valve (12), then the pressure in an intermediate container (7) is reduced to 1Mpa through the pressure relief of the needle valve (2), the needle valve (8) is opened to form a pressure difference between the recovery tank (9) and the intermediate container (7), the phase state of the recyclable novel paraffin remover in the recovery tank (9) is changed from liquid state to gas state and enters the intermediate container (7), the pressure in the intermediate container (7) is increased to be higher than 0.5Mpa through the needle valve (2), the phase state of the recyclable novel paraffin remover in the intermediate container (7) is changed from gas state to liquid state at the moment, and the recyclable novel paraffin remover which can be changed into liquid state through the needle valve (6) enters a storage tank (5) for storage, the recovered novel paraffin remover with recoverability is added into a reaction kettle (10) from a storage tank (5) through a needle valve (11) and is repeatedly used.
The formulations of the present invention are illustrated by specific examples below:
example 1:
the main agent is dimethyl ether and water, the surface active agent is sodium dodecyl benzene sulfonate and SP80, the mutual solvent is ethylene glycol monobutyl ether, and the mixture ratio is as follows (according to mass percent):
the preparation method comprises the following steps: adding 300g of water into a reaction kettle (10), starting stirring, sequentially adding 10g of sodium dodecyl benzene sulfonate, 180g of ethanol and 10g of SP80 under stirring, pressurizing the reaction kettle (10) to a pressure higher than 0.5Mpa through a needle valve (4), adding 500g of dimethyl ether into the reaction kettle (10) through a storage tank (5) and a needle valve (11), and continuously stirring uniformly to obtain the product.
The test shows that the wax dissolving rate of the product to No. 56 paraffin wax is 0.0487g/min at 45 ℃, and the recovery rate of the novel paraffin remover with recoverability obtained by the recovery operation reaches 83 percent.
Example 2:
the main agent is dimethyl ether and water, the surface active agent is isoamyl alcohol and hexadecyl trimethyl ammonium chloride, the mutual solvent is ethanol, and the mixture ratio (by mass percent) is as follows:
the preparation method comprises the following steps: adding 300g of water into a reaction kettle (10), starting stirring, sequentially adding 10g of hexadecyl trimethyl ammonium chloride, 80g of ethanol and 10g of isoamyl alcohol under stirring, pressurizing the reaction kettle (10) to a pressure higher than 0.5Mpa through a needle valve (4), adding 600g of dimethyl ether into the reaction kettle (10) through a storage tank (5) and a needle valve (11), and continuously stirring uniformly to obtain the product.
The test shows that the wax dissolving rate of the product to No. 56 paraffin wax is 0.0437g/min at 45 ℃, and the recovery rate of the novel paraffin remover with recoverability obtained by the recovery operation reaches 88%.
Example 3:
the main agent is dimethyl ether and water, the surface active agent is hexadecyl trimethyl ammonium chloride and SP80, the mutual solvent is ethylene glycol monobutyl ether, and the mixture ratio (according to mass percentage) is as follows:
the preparation method comprises the following steps: adding 220g of water into a reaction kettle (10), starting stirring, sequentially adding 10g of hexadecyl trimethyl ammonium chloride, 60g of ethanol and 10g of SP80 under stirring, then pressurizing the reaction kettle (10) to be higher than 0.5Mpa through a needle valve (4), then adding 700g of dimethyl ether into the reaction kettle (10) through a storage tank (5) and a needle valve (11), and continuously stirring uniformly to obtain the product.
The test shows that the wax dissolving rate of the product to No. 56 paraffin wax is 0.034g/min at 45 ℃, and the recovery rate of the novel recyclable paraffin remover obtained by the recovery operation reaches 90 percent. (the rotating speeds are all 40r/min)
The present invention is not limited to the above embodiments, and any other products in various forms can be obtained by the teaching of the present invention, but any changes in the components or the ratio thereof, which have the same or similar technical solutions as the present application, fall within the protection scope of the present invention.
Claims (4)
1. A paraffin remover with recoverability is characterized in that: the composite material comprises the following components in percentage by mass:
2. a paraffin remover as claimed in claim 1, wherein: the mass percentage of the mutual solvent is not less than 6%.
3. The method for preparing a paraffin remover according to claim 1, wherein: under normal pressure, firstly adding a fixed amount of mixed solution of water, a surfactant and an intersolunt prepared in advance into a reaction kettle (10), then pressurizing the reaction kettle (10) to be higher than 0.5Mpa, then adding a fixed amount of dimethyl ether reagent into the reaction kettle (10), and stirring uniformly to obtain the product.
4. The method for recovering a paraffin remover according to claim 1 or 2, wherein: after the wax dissolving reaction is finished, decompressing the reacted paraffin remover, converting the phase state of the paraffin remover from liquid state to gas state when the pressure is below 1Mpa and 1Mpa, collecting the paraffin remover with the phase state being gas state and pressurizing the paraffin remover, converting the phase state of the paraffin remover from gas state to liquid state when the pressure is above 0.5Mpa, then completing the recovery of the paraffin remover, and recycling the recovered paraffin remover.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811070653.1A CN109181666B (en) | 2018-09-13 | 2018-09-13 | Recyclable novel paraffin remover and preparation and recovery methods thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811070653.1A CN109181666B (en) | 2018-09-13 | 2018-09-13 | Recyclable novel paraffin remover and preparation and recovery methods thereof |
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| CN109181666A CN109181666A (en) | 2019-01-11 |
| CN109181666B true CN109181666B (en) | 2021-01-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110643325A (en) * | 2019-10-16 | 2020-01-03 | 西南石油大学 | New application of dimethyl ether, recyclable heavy oil viscosity reducer prepared based on dimethyl ether and preparation and recovery methods of recyclable heavy oil viscosity reducer |
| CN112943167B (en) * | 2021-04-16 | 2023-07-21 | 中海石油(中国)有限公司湛江分公司 | Well-flushing liquid capable of rapidly removing dead oil on pipe wall and well-flushing method thereof |
| CN114989797B (en) * | 2022-07-11 | 2023-06-13 | 西安石油大学 | Composite paraffin removal and descaling agent for oil well and blocking removal process of static pipe column of composite paraffin removal and descaling agent |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101265800A (en) * | 2007-03-13 | 2008-09-17 | 钜力集团有限公司 | Oil layer wax-condensing type oil reservoir mining method |
| CN105238377A (en) * | 2015-09-23 | 2016-01-13 | 山东聚鑫化工有限公司 | Water-based wax cleaning agent |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9328284B2 (en) * | 2011-10-04 | 2016-05-03 | Biospan Technologies, Inc. | Oil thinning compositions and retrieval methods |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101265800A (en) * | 2007-03-13 | 2008-09-17 | 钜力集团有限公司 | Oil layer wax-condensing type oil reservoir mining method |
| CN105238377A (en) * | 2015-09-23 | 2016-01-13 | 山东聚鑫化工有限公司 | Water-based wax cleaning agent |
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