CN106554768A - A kind of water solublity wax-proofing agent and preparation method - Google Patents
A kind of water solublity wax-proofing agent and preparation method Download PDFInfo
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- CN106554768A CN106554768A CN201610936505.8A CN201610936505A CN106554768A CN 106554768 A CN106554768 A CN 106554768A CN 201610936505 A CN201610936505 A CN 201610936505A CN 106554768 A CN106554768 A CN 106554768A
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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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Abstract
The invention provides a kind of water solublity wax-proofing agent, by the material composition of following percentage by weight：The mass ratio of wax crystal modifier 10～50%, dispersant 1～10%, stabilizer 0.5～5%, water and freezing point depressing agent 40～75%, the water and freezing point depressing agent is 40：60～70：30.This water solublity wax-proofing agent that the present invention is provided, without organic solvent, environment-protecting asepsis；Dispersant, stabilizer, the synergism of freezing point depressing agent in formula, can make wax crystal modifier have higher content, after solving existing wax-proofing agent increase wax crystal modifier content, using temperature limited defect.
Description
Technical field
The invention belongs to oil field development technical field, and in particular to a kind of water solublity wax-proofing agent and preparation method.
Background technology
Wax deposition can seriously affect oil well normally to produce liquid to oil well in process of production, or even wax card tubing string, paraffin blockage ground occur
The phenomenons such as pipeline, will not only put into a large amount of human and material resources, financial resources carries out frequently well-flushing, pump detection and workover, and directly affects oil
Well is produced.Because easy to use, application effect is good, becomes the common technology of control and remove of well paraffin for chemical Paraffin Removal.
Conventional wax-proofing agent mainly has wax crystal modifier type and surfactant type.Surfactant type wax-proofing agent typically with
Water compositing dispersion medium, wherein dissolved with surfactant, as surfactant price is high, concentration is big, and clearly, wax control efficiency
It is low, it is difficult to promote；It is usually solid-state in the presence of wax crystal modifier room temperature, using when by wax crystal modifier in crude benzol, dimethylbenzene etc.
Dissolve in arene, it is low to there is volatile, flash-point, the problems such as life-time service negative unhealthy, harm environment；Also there is document
" development of water base wax crystal modifier type wax-proofing agent and application " reports the method being evenly dispersed in wax crystal modifier in water,
Safety and environmental protection, but the content of wax crystal modifier up to 7%, effective content is relatively low, increases transport, the cost of storage, if increase
Wax crystal modifier content, then wax-proofing agent freezing point is higher, using temperature limited.
The content of the invention
Present invention aim to address contain organic solvent in existing wax crystal modifier type wax-proofing agent, exist it is volatile,
Flash-point is low, inflammable, and life-time service negative unhealthy, effective content are low, uses the problems such as being limited.
For this purpose, the invention provides a kind of water solublity wax-proofing agent, by the material composition of following percentage by weight：Wax is brilliant to be improved
Agent 10～50%, dispersant 1～10%, stabilizer 0.5～5%, water and freezing point depressing agent 40～75%, the water and freezing point depressing agent
Mass ratio be 40：60～70：30.
It is 1 that the wax crystal modifier is mass ratio:2 ethylene-vinyl acetate copolymer and methacrylic acid are senior mixed
Close the compound of ester-maleic anhydride-styrene copolymers composition.
The dispersant is 1 by mass ratio：1 behenic acid sodium or behenic acid potassium and polyoxyethylene aliphatic alcohol ether group
Into.
The stabilizer is polyvinyl alcohol or carboxymethyl cellulose, and relative molecular weight is 12～150,000.
The freezing point depressing agent is methanol, ethanol or ethylene glycol.
Present invention also offers a kind of preparation method of water solublity wax-proofing agent, comprises the following steps：
Step 1）The wax crystal modifier of formula ratio is added in double screw extruder, is kneaded at 160～190 DEG C, then will
Mix with wax crystal modifier in the dispersant injection double screw extruder of formula ratio；
Step 2）Emulsifier unit is transported to after mix homogeneously, temperature is maintained at 60～90 DEG C, sequentially add formula ratio stabilizer,
Water and freezing point depressing agent, are stirred with the speed of 200～300r/h, obtain uniform and stable wax control agent solution.
The invention has the beneficial effects as follows：This water solublity wax-proofing agent that the present invention is provided, without organic solvent, environmentally friendly nothing
Poison；Dispersant, stabilizer, the synergism of freezing point depressing agent in formula, can make wax crystal modifier have higher content,
After solving existing wax-proofing agent increase wax crystal modifier content, using temperature limited defect.
Wax crystal modifier effective content is high, easy to use, has saved shipping storage cost；Can efficiently reduce conventional clear
Wax and thermal washing operation, extend the crude oil wax cycle.In Changqing oilfields application, the wax-proofing agent can reduce crude oil wax precipitation point up to 8.1
DEG C, inhibiting rate for wax precipitation>70%, effectively reduce downhole tubular, roofbolt load, Extended Pump Detection Period.
To be described in further details below.
Specific embodiment
Embodiment 1：
A kind of water solublity wax-proofing agent is present embodiments provided, by the material composition of following percentage by weight：Wax crystal modifier 10～
50%, dispersant 1～10%, stabilizer 0.5～5%, the quality of water and freezing point depressing agent 40～75%, the water and freezing point depressing agent
Than for 40：60～70：30.
The principle of the invention：Wax crystal modifier prevents the brilliant formation of wax, dispersant from can rapidly enter inside wax crystal modifier, having
There is very strong permeability, destroy the stability of modifier, so as to improve wax crystal modifier dispersibility in aqueous.Stabilizer
Contain great amount of hydroxy group on strand, with good hydrophilic, increase the viscosity of emulsion, wax crystal modifier is improved in aqueous solution
In stability.Freezing point depressing agent can improve the condensation point of wax-proofing agent aqueous solution, with wider temperature use range.
Embodiment 2：
On the basis of embodiment 1, a kind of water solublity wax-proofing agent is present embodiments provided, by the material group of following percentage by weight
Into：The matter of wax crystal modifier 30%, dispersant 10%, stabilizer 3%, water and freezing point depressing agent 57%, the water and freezing point depressing agent
Amount is than being 50：50.
Preparation process：Step 1）The wax crystal modifier of formula ratio is added in double screw extruder, is mixed at 160 DEG C
Refining, then will mix with wax crystal modifier in the dispersant injection double screw extruder of formula ratio；
Step 2）Emulsifier unit is transported to after mix homogeneously, temperature is maintained at 60 DEG C, sequentially add the stabilizer of formula ratio, water and
Freezing point depressing agent, is stirred with the speed of 200r/h, obtains uniform and stable wax control agent solution.
In the present embodiment, wax crystal modifier is 1 by mass ratio:2 ethylene-vinyl acetate copolymer（EVA）And methyl
The senior mixed ester of acrylic acid-maleic anhydride-styrene copolymers composition, wherein, ethylene-vinyl acetate copolymer（EVA）In
Vinyl acetate（VA）Content 30%, 25 g/10min of melt index, the senior mixed ester-maleic anhydride-styrene of methacrylic acid are common
The preparation process of polymers refers to article《The preparation of α-methacrylic acid mixed alcohol ester-maleic anhydride-styrene pour-point depressant and its
Drop filter effect assessment》, Du Tao etc., petrochemical industry, using freedom from solution polymerization process, by methacrylic acid senior mixed ester, horse
It is 4 in molar ratio to come anhydride, styrene：1：The polymer of 1 synthesis；The wherein senior mixed ester of methacrylic acid is by metering system
Acid and higher alcohols（Octadecanol, eicosanol, docosanol（Mol ratio 1：1：1～1：2：3））The senior mixed ester being polymerized.
Dispersant is 1 by mass ratio：1 behenic acid sodium and polyoxyethylene aliphatic alcohol ether composition, polyoxyethylene fatty alcohol
Ether is Brij-35, and model Brij-35, manufacturer are Jiangsu Hai'an petrochemical plant, and stabilizer is poly-
Vinyl alcohol, relative molecular weight are 12～150,000, and freezing point depressing agent is methanol.
Ethylene-vinyl acetate copolymer in wax crystal modifier, it is brilliant to the wax of common middle low carbon number（C20-C30）Have preferably
Adaptability, the senior mixed ester-maleic anhydride-styrene copolymers of methacrylic acid then have preferably suitable to the wax crystalline substance of C30-C40
Ying Xing, its with can play cooperative effect well both during ethylene-vinyl acetate copolymer compounding use, it is anti-so as to improve
The adaptability of cerate（Expand the scope of wax crystalline substance carbon number）.
Embodiment 3：
On the basis of embodiment 1, a kind of water solublity wax-proofing agent is present embodiments provided, by the material group of following percentage by weight
Into：Wax crystal modifier 40%, dispersant 8.5%, stabilizer 4.5%, water and freezing point depressing agent 47%, the water and freezing point depressing agent
Mass ratio is 40：60.
Preparation process：Step 1）The wax crystal modifier of formula ratio is added in double screw extruder, is mixed at 170 DEG C
Refining, then will mix with wax crystal modifier in the dispersant injection double screw extruder of formula ratio；
Step 2）Emulsifier unit is transported to after mix homogeneously, temperature is maintained at 80 DEG C, sequentially add the stabilizer of formula ratio, water and
Freezing point depressing agent, is stirred with the speed of 250r/h, obtains uniform and stable wax control agent solution.
In the present embodiment, wax crystal modifier is 1 by mass ratio:2 ethylene-vinyl acetate copolymer（EVA）And methyl
The senior mixed ester of acrylic acid-maleic anhydride-styrene copolymers composition, wherein, ethylene-vinyl acetate copolymer（EVA）In
Vinyl acetate（VA）Content 28%, 43 g/10min of melt index, the senior mixed ester-maleic anhydride-styrene of methacrylic acid are common
The preparation process of polymers refers to article《The preparation of α-methacrylic acid mixed alcohol ester-maleic anhydride-styrene pour-point depressant and its
Drop filter effect assessment》, Du Tao etc., petrochemical industry, using freedom from solution polymerization process, by methacrylic acid senior mixed ester, horse
It is 4 in molar ratio to come anhydride, styrene：1：The polymer of 1 synthesis；The wherein senior mixed ester of methacrylic acid is by metering system
Acid and higher alcohols（Octadecanol, eicosanol, docosanol（Mol ratio 1：1：1～1：2：3））The senior mixed ester being polymerized.
Dispersant is 1 by mass ratio：1 behenic acid potassium and polyoxyethylene aliphatic alcohol ether composition, polyoxyethylene fatty alcohol
Ether is Brij-35, and model Brij-35, manufacturer are Jiangsu Hai'an petrochemical plant, and stabilizer is carboxylic
Methylcellulose, relative molecular weight are 12～150,000, and freezing point depressing agent is ethanol.
Embodiment 4：
On the basis of embodiment 1, a kind of water solublity wax-proofing agent is present embodiments provided, by the material group of following percentage by weight
Into：The quality of wax crystal modifier 15%, dispersant 6%, stabilizer 4%, water and freezing point depressing agent 75%, the water and freezing point depressing agent
Than for 70：30.
Preparation process：Step 1）The wax crystal modifier of formula ratio is added in double screw extruder, is mixed at 170 DEG C
Refining, then will mix with wax crystal modifier in the dispersant injection double screw extruder of formula ratio；
Step 2）Emulsifier unit is transported to after mix homogeneously, temperature is maintained at 80 DEG C, sequentially add the stabilizer of formula ratio, water and
Freezing point depressing agent, is stirred with the speed of 200r/h, obtains uniform and stable wax control agent solution.
In the present embodiment, wax crystal modifier is 1 by mass ratio:2 ethylene-vinyl acetate copolymer（EVA）And methyl
The senior mixed ester of acrylic acid-maleic anhydride-styrene copolymers composition, wherein, ethylene-vinyl acetate copolymer（EVA）In
Vinyl acetate（VA）Content 28%, 6 g/10min of melt index, the senior mixed ester-maleic anhydride-styrene of methacrylic acid are common
The preparation process of polymers refers to article《The preparation of α-methacrylic acid mixed alcohol ester-maleic anhydride-styrene pour-point depressant and its
Drop filter effect assessment》, Du Tao etc., petrochemical industry.
Dispersant is 1 by mass ratio：1 behenic acid potassium and polyoxyethylene aliphatic alcohol ether composition, polyoxyethylene fatty alcohol
Ether is Brij-35, and model Brij-35, manufacturer are Jiangsu Hai'an petrochemical plant, and stabilizer is poly-
Vinyl alcohol, relative molecular weight are 12～150,000, and freezing point depressing agent is ethylene glycol.
Embodiment 5：
A kind of water solublity wax-proofing agent is present embodiments provided on the basis of embodiment 1, by the material group of following percentage by weight
Into：The quality of wax crystal modifier 50%, dispersant 8%, stabilizer 4%, water and freezing point depressing agent 38%, the water and freezing point depressing agent
Than for 50：50.
Preparation process：Step 1）The wax crystal modifier of formula ratio is added in double screw extruder, is mixed at 190 DEG C
Refining, then will mix with wax crystal modifier in the dispersant injection double screw extruder of formula ratio；
Step 2）Emulsifier unit is transported to after mix homogeneously, temperature is maintained at 80 DEG C, sequentially add the stabilizer of formula ratio, water and
Freezing point depressing agent, is stirred with the speed of 200r/h, obtains uniform and stable wax control agent solution.
In the present embodiment, wax crystal modifier is 1 by mass ratio:2 ethylene-vinyl acetate copolymer（EVA）And methyl
The senior mixed ester of acrylic acid-maleic anhydride-styrene copolymers composition, wherein, ethylene-vinyl acetate copolymer（EVA）In
Vinyl acetate（VA）Content 28%, 6 g/10min of melt index, the senior mixed ester-maleic anhydride-styrene of methacrylic acid are common
The preparation process of polymers refers to article《The preparation of α-methacrylic acid mixed alcohol ester-maleic anhydride-styrene pour-point depressant and its
Drop filter effect assessment》, Du Tao etc., petrochemical industry.
Dispersant is 1 by mass ratio：1 behenic acid potassium and polyoxyethylene aliphatic alcohol ether composition, polyoxyethylene fatty alcohol
Ether is Brij-35, and model Brij-35, manufacturer are Jiangsu Hai'an petrochemical plant, and stabilizer is carboxylic
Methylcellulose, freezing point depressing agent are ethanol.
Waxing in production well, can be according to oil well output, wax period filling water solublity wax-proofing agent, as oil well is tied after thermal washing
Wax is more complicated, will be evaluated in laboratory using before, then determines adding amount and filling cycle.
The wax control agent solution that embodiment 5 is prepared by interior is further diluted with water to 5% solution, with Changqing oilfields A blocks
AP42 oil well crude oils are test object, evaluate the effect of wax-proofing agent.
1 water solublity wax-proofing agent Lab-evaluation of table is tested
| Plus dosage, mg/l | Viscosity break ratio, % | Wax precipitation point reduces amplitude, DEG C | Inhibiting rate for wax precipitation, % |
| 100 | 42.3 | 3.5 | 62.8 |
| 150 | 56.2 | 5.2 | 68.4 |
| 200 | 65.5 | 8.1 | 74.3 |
From experimental data, in 200mg/l, viscosity break ratio more than 65% reduces crude oil wax precipitation point to 5% wax-proofing agent solution concentration
8.1 DEG C, inhibiting rate for wax precipitation 74.3%.
6 mouthful wells, dosing are tested in Changqing oilfields A blocks using the 5% of the preparation of the embodiment of the present invention 5 wax control agent solution
Concentration is 200 mg/l, and before test, average maximum load is 63.7KN, and after test, average maximum load is 58.5KN, maximum load
Decline 5.2KN；Before test, average maximum current is 32.0A, and after test, average maximum current is 31.4A；6 mouthfuls of wells are during testing
There is not wax deposition phenomenon, pipeline performance is normal., in test 3 months, pipeline pipeline purging is clear for the well of the block filling CX medicaments simultaneously
Wax more than 80 times, 113 well of pit shaft thermal washing, because wax deposition seriously occurs 32 well of maintainability operation.The wax control agent solution effectively slows down
Oil well paraffinication, meets A block waxing in production well Production requirements.
2 water solublity wax-proofing agent effect of field application of table
In sum, this water solublity wax-proofing agent that the present invention is provided, without organic solvent, environment-protecting asepsis；Dispersion in formula
Agent, stabilizer, the synergism of freezing point depressing agent, can make wax crystal modifier have higher content, solve existing wax control
After agent increase wax crystal modifier content, using temperature limited defect.
The method and structure that various embodiments above is not described in detail belongs to the common knowledge of the industry, does not chat one by one here
State.
Exemplified as above is only the illustration to the present invention, does not constitute the restriction to protection scope of the present invention, all
It is that design same or analogous with the present invention is belonged within protection scope of the present invention.
Claims (6)
1. a kind of water solublity wax-proofing agent, it is characterised in that by the material composition of following percentage by weight：Wax crystal modifier 10～
50%, dispersant 1～10%, stabilizer 0.5～5%, the quality of water and freezing point depressing agent 40～75%, the water and freezing point depressing agent
Than for 40：60～70：30.
2. a kind of water solublity wax-proofing agent according to claim 1, it is characterised in that：The wax crystal modifier for mass ratio is
1:What 2 ethylene-vinyl acetate copolymer and the senior mixed ester of methacrylic acid-maleic anhydride-styrene copolymers were constituted
Compound.
3. a kind of water solublity wax-proofing agent according to claim 1, it is characterised in that：The dispersant is 1 by mass ratio：1
Behenic acid sodium or behenic acid potassium and polyoxyethylene aliphatic alcohol ether composition.
4. a kind of water solublity wax-proofing agent according to claim 1, it is characterised in that：The stabilizer is polyvinyl alcohol or carboxylic
Methylcellulose, relative molecular weight are 12～150,000.
5. a kind of water solublity wax-proofing agent according to claim 1, it is characterised in that：The freezing point depressing agent is methanol, second
Alcohol or ethylene glycol.
6. the preparation method of a kind of water solublity wax-proofing agent according to claim 1, it is characterised in that comprise the following steps：
Step 1）The wax crystal modifier of formula ratio is added in double screw extruder, is kneaded at 160～190 DEG C, then will
Mix with wax crystal modifier in the dispersant injection double screw extruder of formula ratio；
Step 2）Emulsifier unit is transported to after mix homogeneously, temperature is maintained at 60～90 DEG C, sequentially add formula ratio stabilizer,
Water and freezing point depressing agent, are stirred with the speed of 200～300r/h, obtain uniform and stable wax control agent solution.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108641693A (en) * | 2018-04-22 | 2018-10-12 | 陈琪峰 | A kind of oil field Wax removing agent |
| CN111808587A (en) * | 2019-04-10 | 2020-10-23 | 中国石油化工股份有限公司 | Oil-based wax inhibitor |
| CN112500300A (en) * | 2020-12-11 | 2021-03-16 | 山东德仕化工有限公司 | Polyoxyethylene alkylphenol ether water-based wax inhibitor and preparation method and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1775894A (en) * | 2005-12-14 | 2006-05-24 | 大庆油田有限责任公司 | Wax-cleaning wax-preventing agent for water-driving polymer-driving oil well |
| CN105086976A (en) * | 2015-08-25 | 2015-11-25 | 中国石油化工股份有限公司 | Efficient wax inhibitor for oilfields |
-
2016
- 2016-10-24 CN CN201610936505.8A patent/CN106554768A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1775894A (en) * | 2005-12-14 | 2006-05-24 | 大庆油田有限责任公司 | Wax-cleaning wax-preventing agent for water-driving polymer-driving oil well |
| CN105086976A (en) * | 2015-08-25 | 2015-11-25 | 中国石油化工股份有限公司 | Efficient wax inhibitor for oilfields |
Non-Patent Citations (1)
| Title |
|---|
| 杜涛等: "α-甲基丙烯酸混合醇酯-马来酸酐-苯乙烯降凝剂的制备及其降滤效果评价", 《石油化工》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108641693A (en) * | 2018-04-22 | 2018-10-12 | 陈琪峰 | A kind of oil field Wax removing agent |
| 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 |
| CN111808587A (en) * | 2019-04-10 | 2020-10-23 | 中国石油化工股份有限公司 | Oil-based wax inhibitor |
| CN112500300A (en) * | 2020-12-11 | 2021-03-16 | 山东德仕化工有限公司 | Polyoxyethylene alkylphenol ether water-based wax inhibitor and preparation method and application thereof |
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