CN108101999A - A kind of sulfoalkylation starch, its preparation method and application - Google Patents
A kind of sulfoalkylation starch, its preparation method and application Download PDFInfo
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- CN108101999A CN108101999A CN201611063475.0A CN201611063475A CN108101999A CN 108101999 A CN108101999 A CN 108101999A CN 201611063475 A CN201611063475 A CN 201611063475A CN 108101999 A CN108101999 A CN 108101999A
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- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B31/00—Preparation of derivatives of starch
- C08B31/08—Ethers
- C08B31/12—Ethers having alkyl or cycloalkyl radicals substituted by heteroatoms, e.g. hydroxyalkyl or carboxyalkyl starch
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/20—Natural organic compounds or derivatives thereof, e.g. polysaccharides or lignin derivatives
- C09K8/206—Derivatives of other natural products, e.g. cellulose, starch, sugars
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Abstract
The present invention relates to starch conversion technical fields, and the present invention provides a kind of sulfoalkylation starch, its preparation method and application, this method to comprise the following steps：In alkaline conditions, starch and water-soluble halogenated esilate in aqueous solvent are reacted, obtains sulfoalkylation starch, the sulfoalkylation starch contains ethanesulfonic acid base and hydroxyl.The sulfoalkylation starch is used in drilling fluid, while effectively control drilling fluid filtration, can improve the salt resistance pollution of drilling fluid, the particularly ability of anticalcium ionic soil.Also, the sulfonic group in the product is also beneficial to improve the thermal stability of drilling fluid, expands the scope of application.In addition, the simple production process of product of the present invention, production cost are low, production efficiency is high, and product quality is stablized, beneficial to application.
Description
Technical field
The present invention relates to a kind of starch conversion technical field more particularly to sulfoalkylation starch, its preparation method and applications.
Background technology
In recent years, starch conversion product because abundance, green, it is inexpensive due to become important additive for drilling fluid.Initially
People by pregelatinated or expanded starch for drilling fluid, but using when because during fermentation drilling fluid being caused to blister effect can be made to be deteriorated.
Also, when temperature be more than 100 DEG C after in addition can because starch it is degradable due to fail.
Development and application the 1980s carboxymethyl starch (CMS), temperature resistance ability have certain raising；And by starch with
The graft copolymerization of vinyl monomer can be such that temperature resistance ability further improves, but cost increases.Using CMS as the starch conversion product of representative
It is the preferable fluid loss additive of generally acknowledged saturated salt-water drilling fluid, it is deep to be paid attention to by drilling fluid industry.But carboxymethyl starch is being applied
In there are anticalcium ability is low, it is impossible to the problems such as meeting high-salinity drilling fluid Filtrate Loss Control, i.e., because of temperature resistance, particularly anticalcium energy
Power is insufficient and limits its application range.
The content of the invention
In view of this, the application provides a kind of sulfoalkylation starch, its preparation method and application, sulphur alkane provided by the invention
When base starch is used as additive for drilling fluid, there is stronger temperature resistance ability and anticalcium ability, beneficial to application.
The present invention provides a kind of sulfoalkylation starch, anti-in alkaline conditions by starch and water-soluble halogenated esilate
It should be made；The sulfoalkylation starch contains ethanesulfonic acid base and hydroxyl.
Preferably, the one kind or more of the starch in cornstarch, potato starch, tapioca and wheaten starch
Kind.
Preferably, the halogenated esilate of water solubility is 2- chloro ethanesulfonic acids sodium, 2- bromoethane sulfonic acids sodium or 2- iodos
Ethanesulfonic acid sodium.
Preferably, the sulfonation degree of the sulfoalkylation starch is 0.1~0.6；1wt% sulfoalkylation amidins glue
It spends for 50~200mPas.
The present invention provides a kind of preparation method of sulfoalkylation starch, comprises the following steps：
In alkaline conditions, starch and water-soluble halogenated esilate in aqueous solvent are reacted, obtains sulphur alkane
Base starch.
Preferably, the aqueous solvent is the mixed solution formed by alcohol and water.
Preferably, the reaction carries out under the conditions of existing for catalyst, and the catalyst is selected from benzyl triethyl ammonium chlorination
Ammonium, tetrabutylammonium bromide, tetrabutylammonium chloride, 4-butyl ammonium hydrogen sulfate, tri-n-octyl methyl ammonium chloride, trimethyl chlorine
Change the one or more in ammonium and tetradecyl trimethyl ammonium chloride.
Preferably, the molar ratio of the starch, water-soluble halogenated esilate and catalyst is 1:(0.505~1.05):
(0.025~0.05).
Preferably, the temperature of the reaction is 35~70 DEG C, and the time of the reaction is 1h~10h.
The present invention also provides a kind of drilling fluids, and including inorganic agent, the inorganic agent includes sulfoalkylation described above and forms sediment
Powder.
Compared with prior art, sulfoalkylation starch provided by the invention by starch and water-soluble halogenated esilate in alkali
Property under the conditions of react be made；It is simultaneously containing groups such as ethanesulfonic acid base and hydroxyls.The sulfoalkylation starch is used in drilling fluid,
While effectively control drilling fluid filtration, the salt resistance pollution of drilling fluid, particularly anticalcium ionic soil can be improved
Ability.Also, the sulfonic group in the product is also beneficial to improve the thermal stability of drilling fluid, expands the scope of application.
In addition, the production cost of product of the present invention is low, production efficiency is high, and product quality is stablized.
Description of the drawings
Fig. 1 is CaCl in the saturated salt-water drilling fluid containing 1.5% sample of the embodiment of the present invention2Dosage is to wellbore liquid leaching loss
The influence of amount.
Specific embodiment
The technical solution in the embodiment of the present invention is clearly and completely described below, it is clear that described embodiment
Only part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, the common skill in this field
Art personnel all other embodiments obtained without making creative work belong to the model that the present invention protects
It encloses.
The present invention provides a kind of sulfoalkylation starch, by starch and water-soluble halogenated esilate in alkaline conditions
Reaction is made；The sulfoalkylation starch contains ethanesulfonic acid base and hydroxyl.
Sulfoalkylation starch provided by the invention can be used in drilling fluid, have stronger temperature resistance ability and anticalcium ability,
The application range of starch inorganic agent can be expanded.
Sulfoalkylation starch provided by the invention is made by starch and water-soluble halogenated esilate, in alkaline conditions reaction
.Wherein, the starch can be the one or more in cornstarch, potato starch, tapioca and wheaten starch, this hair
It is bright to be not particularly limited, using commercial product.The halogenated esilate of water solubility can draw as sulfonating agent in starch
Enter ethanesulfonic acid base；It is preferably the halogenated ethanesulfonic acid sodium of 2-, more preferably 2- chloro ethanesulfonic acids sodium, 2- bromoethane sulfonic acids sodium or 2- iodine
For ethanesulfonic acid sodium.
In the present invention, the molar ratio of the starch and water-soluble halogenated esilate is preferably 1:(0.505~1.05),
More preferably 1：(0.6~0.9).The alkaline condition can be provided by alkaline matters such as sodium hydroxide or potassium hydroxide, preferably be adopted
Use sodium hydroxide.In some embodiments of the invention, mass fraction can be used and provide alkali for 50% sodium hydrate aqueous solution
Property condition；The molar ratio of the starch, sodium hydroxide and sulfonating agent is preferably 1:(0.905~1.2):(0.505~1.05).
In the present invention, the sulfoalkylation starch contains ethanesulfonic acid base and hydroxyl, in drilling fluid, effectively controlling
While drilling fluid filtration processed, the salt resistance pollution of drilling fluid, the particularly ability of anticalcium ionic soil can be improved.Also,
Sulfonic group in the product is also beneficial to improve the thermal stability of drilling fluid, expands the scope of application.
Sulfonation degree (DS) reflects the number that polymer contains sulfonic acid group；In an embodiment of the present invention, the sulphur alkane
The sulfonation degree of base starch (can use BaCl for 0.1~0.6 after calcination2Titration measures).In an embodiment of the present invention, 1wt%
The viscosity of sulfoalkylation amidin is 50~200mPas (being measured at a temperature of 25 DEG C).
The present invention provides a kind of preparation methods of sulfoalkylation starch, comprise the following steps：
In alkaline conditions, starch and water-soluble halogenated esilate in aqueous solvent are reacted, obtains sulphur alkane
Base starch.
The present invention has synthesized the starch derivatives with the sulfonic acid group insensitive to high volence metal ion, that is, is prepared
Sulfoalkylation starch, temperature resistance ability and anticalcium ability are stronger, can expand the application range of starch inorganic agent.
The embodiment of the present invention adds starch, alkaline matter and water-soluble esilate according to the amount ratio of certain substance
Enter in aqueous solvent system, reacted.The present invention preferably first adds in starch in aqueous solvent, then adds in alkaline matter,
Water-soluble esilate reaction is added after stirring.
In the present invention, the starch can be one kind in cornstarch, potato starch, tapioca and wheaten starch
Or it is a variety of, the present invention is not particularly limited, using commercial product.The halogenated esilate of water solubility as sulfonating agent,
Ethanesulfonic acid base can be introduced in starch；It is preferably the halogenated ethanesulfonic acid sodium of 2-, more preferably 2- chloro ethanesulfonic acids sodium, 2- bromo second
Sodium sulfonate or 2- iodo ethanesulfonic acid sodium.Wherein, the molar ratio of the starch and water-soluble halogenated esilate is preferably 1:
(0.505~1.05).
In the present invention, the alkaline condition can be provided by alkaline matters such as sodium hydroxide or potassium hydroxide, it is preferred to use
Sodium hydroxide.In some embodiments of the invention, mass fraction can be used and provide alkalescence for 50% sodium hydrate aqueous solution
Condition；The molar ratio of the starch, sodium hydroxide and sulfonating agent is preferably 1:(0.905~1.2):(0.505~1.05).
The reaction process of the present invention carries out in aqueous solvent, and the aqueous solvent is preferably the mixing formed by alcohol and water
Solution, so not only reaction efficiency is high, but also product reaction process is easy to control, technological operation is simple, and product quality is stablized.This
Outside, solvent recycling easy to implement, production cost are low.In the present invention, the alcohol can be methanol, ethyl alcohol or isopropyl
Alcohol.In the alcohol-water system, the volume ratio of alcohol and water is preferably (7：3)~(6:4).
In the present invention, the reaction carries out preferably under the conditions of existing for catalyst；The catalyst preferably is selected from benzyl
Triethyl ammonium chloride (TEBA), tetrabutylammonium bromide, tetrabutylammonium chloride, 4-butyl ammonium hydrogen sulfate (TBAB), tricaprylmethyl
One or more in ammonium chloride, dodecyl trimethyl ammonium chloride and tetradecyl trimethyl ammonium chloride.It is the starch, water-soluble
The molar ratio of the halogenated esilate of property and catalyst is preferably 1:(0.505~1.05):(0.025~0.05)；The present invention's
In some embodiments, with the gauge of substance, the starch：Sodium hydroxide：Sulfonating agent：Catalyst=1:(0.905~1.2)：
(0.505~1.05)：(0.025~0.05).
Starch is added in alcohol-water system according to aforementioned proportion, then adds in alkaline matter, preferably by the embodiment of the present invention
0.5h~4h is stirred at room temperature；Sulfonating agent and catalyst are added, reaction temperature is warming up under stirring, reacts certain time
Afterwards, reaction solution is obtained.Wherein, the temperature of the reaction is preferably 35~70 DEG C, more preferably 40~60 DEG C.The reaction when
Between be preferably 1h~10h, more preferably 1h~5h.What room temperature of the present invention was well known to those skilled in the art, generally
For 20~30 DEG C.
It is 7~8.5 that reaction obtained material can be neutralized to pH value by the embodiment of the present invention with acid, then by reactant centrifugation point
From solvent is used again by distillation is recyclable；Products therefrom is washed with 1~3 times of methanol, then is centrifuged, and methanol is by distilling back
Receipts are used again, after current products therefrom dry, pulverize, obtain sulfoalkylation starch product.
In the present invention, products obtained therefrom contains ethanesulfonic acid base and hydroxyl.The embodiment of the present invention is to gained sulfoalkylation starch
Product carries out performance detection, as used BaCl after calcination2Titration detection sulfonation degree.The results show that the DS of products obtained therefrom for 0.1~
0.6；The viscosity of 1wt% sulfoalkylations amidin is 50~200mPas at 25 DEG C.
Sulfoalkylation starch produced by the present invention may be used as the inorganic agent in drilling fluid, can specifically be used as water-based drilling
The fluid loss additive or tackifier of liquid, have stronger anticalcium and temperature resistance ability, can efficiently control drilling fluid filter loss and
Rheological characteristic expands the application range of starch inorganic agent.In addition, simple production process of the present invention, production efficiency is high, product matter
Amount is stablized, and production is at low cost.
The present invention also provides a kind of drilling fluids, and including inorganic agent, the inorganic agent includes sulfoalkylation described above
Starch.
In embodiments of the present invention, the drilling fluid be water-base drilling fluid, can be fresh-water drilling fluid, salt-water drilling fluid or
Saturated salt-water drilling fluid.The density p of the drilling fluid can be 1.03~1.25g/m3；PH value can be 8~9.The drilling fluid bag
Base slurry is included, after being mixed by water or brine, natrium carbonicum calcinatum and bentonite, stirring, maintenance are made.Prepare base slurry such as fresh water-based slurry
When, the embodiment of the present invention can add in (3~5) g natrium carbonicum calcinatums and (40~100) g bentonites in 1000mL water.The present invention is right
Brine and bentonite etc. are not particularly limited, it is preferred to use calcium bentonite.
The drilling fluid includes inorganic agent, and the inorganic agent includes sulfoalkylation starch described above.The present invention's
In preferred embodiment, the dosage of the sulfoalkylation starch is 0.1~1.5 (w/v) % of base slurry.In embodiments of the present invention,
The quality of each inorganic agent is weighed on the basis of the volume of base slurry, for example it is 0.1~1.5% to add in dosage in 1000mL bases slurry
Sulfoalkylation starch exactly adds in 1~15g sulfoalkylation starch；The dosage percentage is represented by (w/v) %, can also write a Chinese character in simplified form
For %.
The present invention is not particularly limited the source of the inorganic agent, and commercial product can be used, and may also include this field
Common water-base drilling fluid chemicals.The present invention is also not particularly limited the preparation method of the drilling fluid, according to this field
It is prepared by conventional method.
According to GB/T 16783.1-2014《Industrial gas oil drilling fluid on-the-spot test the 1st：Water-base drilling fluid》It surveys
Determine property of drilling fluid.The result shows that the present invention applies sulfoalkylation starch described above so that the filter loss of drilling fluid is small,
Rheological characteristic is stablized, and comprehensive performance is more preferable.
For a further understanding of the application, the sulfoalkylation starch provided with reference to embodiment the application, its preparation
Methods and applications are specifically described.
Embodiment 1
According to starch：Sodium hydroxide：2- bromoethane sulfonic acid sodium：Amount ratio=1 of the substance of benzyltriethylammoinium chloride:
0.905:0.505:0.025,100g starch is added in into ethanol-water system (alcohol：Volume ratio=7 of water:3) in, matter is then added in
The sodium hydrate aqueous solution that fraction is 50% is measured, stirs 0.5h at room temperature；Add in the 2- bromoethane sulfonic acids sodium and benzyl of formula ratio
Triethylammonium chloride is warming up to 35 DEG C under stirring, react 10h at 35 DEG C, obtain reaction solution；It is neutralized with hydrochloric acid to pH value and is
7~8.5, then reactant is centrifuged, solvent is used again by being distilled to recover, and products therefrom is washed with 1~3 times of methanol, from
The heart separates, and methanol is used again by being distilled to recover；Products therefrom dry, pulverize, and obtain 106.5g products.
For method as described above to product testing, the DS of products obtained therefrom is 0.15；1% Aqueous Solution Viscosity is
70mPa.s。
Embodiment 2
According to starch：Sodium hydroxide：2- bromoethane sulfonic acid sodium：Amount ratio=1 of the substance of benzyltriethylammoinium chloride:1.2:
1.05:0.05,100g starch is added in into ethanol-water system (alcohol：Volume ratio=6 of water:4) in, then adding in mass fraction is
50% sodium hydrate aqueous solution, stirs 4h at room temperature；Add in the 2- bromoethane sulfonic acids sodium of formula ratio and benzyl triethyl ammonium chlorine
Change ammonium, 70 DEG C are warming up under stirring, 1h is reacted at 70 DEG C, obtains reaction solution；It is 7~8.5 to be neutralized with hydrochloric acid to pH value, then
Reactant is centrifuged, solvent is used again by being distilled to recover, and products therefrom is washed with 1~3 times of methanol, is centrifuged, methanol
It is used again by being distilled to recover；Products therefrom dry, pulverize, and obtain 107.1g products.
For method as described above to product testing, the DS of products obtained therefrom is 0.41；1% Aqueous Solution Viscosity is
62mPa.s。
Embodiment 3
According to starch：Sodium hydroxide：2- bromoethane sulfonic acid sodium：Amount ratio=1 of the substance of benzyltriethylammoinium chloride:
1.05:0.9:0.045,100g starch is added in into ethanol-water system (alcohol：Volume ratio=6.5 of water:3.5) in, matter is then added in
The sodium hydrate aqueous solution that fraction is 50% is measured, stirs 3h at room temperature；Add in the 2- bromoethane sulfonic acids sodium and benzyl of formula ratio
Triethyl ammonium chloride is warming up to 55 DEG C under stirring, react 1h at 55 DEG C, obtain reaction solution；Be neutralized with hydrochloric acid to pH value for 7~
8.5, then reactant is centrifuged, solvent is used again by being distilled to recover, and products therefrom is washed with 1~3 times of methanol, centrifugation point
From methanol is used again by being distilled to recover；Products therefrom dry, pulverize, and obtain 106.3g products.
For method as described above to product testing, the DS of products obtained therefrom is 0.51；1% Aqueous Solution Viscosity is
150mPa.s。
Embodiment 4
According to embodiment 3, ethyl alcohol is replaced with methanol.The DS of products obtained therefrom is 0.49, and 1% Aqueous Solution Viscosity is
110mPa.s。
Embodiment 5
According to embodiment 3, ethyl alcohol is replaced with isopropanol.The DS of products obtained therefrom is 0.52, and 1% Aqueous Solution Viscosity is
183mPa.s。
Embodiment 6
According to embodiment 3,2- bromoethane sulfonic acid sodium is replaced with 2- chloro ethanesulfonic acid sodium.The DS of products obtained therefrom is 0.475,
1% Aqueous Solution Viscosity is 115mPa.s.
Embodiment 7
According to embodiment 3, benzyltriethylammoinium chloride is replaced with 2- iodo ethanesulfonic acid sodium.The DS of products obtained therefrom is 0.491,
1% Aqueous Solution Viscosity is 135mPa.s.
Embodiment 8
According to embodiment 3, catalyst replaces benzyltriethylammoinium chloride with tetrabutylammonium bromide.The DS of products obtained therefrom is
0.50,1% Aqueous Solution Viscosity is 143mPa.s.
Embodiment 9
According to embodiment 3, catalyst replaces benzyltriethylammoinium chloride with tetrabutylammonium chloride.The DS of products obtained therefrom is
0.49,1% Aqueous Solution Viscosity is 142mPa.s.
Embodiment 10
According to embodiment 3, catalyst replaces benzyltriethylammoinium chloride with 4-butyl ammonium hydrogen sulfate.The DS of products obtained therefrom is
0.481,1% Aqueous Solution Viscosity is 139mPa.s.
Embodiment 11
According to embodiment 3, catalyst replaces benzyltriethylammoinium chloride with tri-n-octyl methyl ammonium chloride.The DS of products obtained therefrom
For 0.505,1% Aqueous Solution Viscosity is 147mPa.s.
Embodiment 12
According to embodiment 3, catalyst replaces benzyltriethylammoinium chloride with dodecyl trimethyl ammonium chloride.Products obtained therefrom
DS for 0.495,1% Aqueous Solution Viscosity is 143mPa.s.
Embodiment 13
According to embodiment 3, catalyst replaces benzyltriethylammoinium chloride with tetradecyl trimethyl ammonium chloride.Products obtained therefrom
DS for 0.50,1% Aqueous Solution Viscosity is 142mPa.s.
Embodiment 14
Fresh-water drilling fluid
3.0g natrium carbonicum calcinatums and 40g calcium bentonites (Weifang Hua Wei bentonites group stock are added in 1000mL tap water
Part Co., Ltd production drilling fluid calcium bentonite), high-speed stirred 20min conserves for 24 hours, obtains fresh water-based slurry at room temperature.Xiang Ji
The sulfoalkylation starch sample that different amounts of embodiment 3 synthesizes is added in slurry, respectively obtains fresh-water drilling fluid.High-speed stirred
5min, aged at room temperature 16h, then high-speed stirred 5min, measure property of drilling fluid respectively, the results are shown in Table 1, table 1 is 14 institute of embodiment
Obtain the performance of fresh-water drilling fluid.Show that gained sulfoalkylation starch has stronger filtrate reducing energy in fresh-water drilling fluid by table 1
Power and certain increasing stick ability.
The performance of 1 embodiment of table, 14 gained fresh-water drilling fluid
Embodiment 15
Salt-water drilling fluid
4.0g natrium carbonicum calcinatums and 80g calcium bentonites, high-speed stirred are added in 1000mL 4wt% (NaCl) brine
20min conserves for 24 hours, obtains brine mud at room temperature.The sulfoalkylation that different amounts of embodiment 3 synthesizes is added in into base slurry to form sediment
Powder sample, respectively obtains salt-water drilling fluid.High-speed stirred 5min, aged at room temperature 16h, then high-speed stirred 5min are measured bore respectively
Well liquid performance the results are shown in Table 2, and table 2 is the performance of 15 gained salt-water drilling fluid of embodiment.Show that gained sulfoalkylation forms sediment by table 2
Powder has apparent filtrate reducing effect in salt-water drilling fluid.
The performance of 2 embodiment of table, 15 gained salt-water drilling fluid
Embodiment 16
Saturated salt-water drilling fluid
5.0g natrium carbonicum calcinatums and 100g calcium bentonites, high-speed stirred are added in 1000mL (NaCl) saturated brine
20min is conserved for 24 hours at room temperature, obtains the water base slurry of saturated salt.The sulfoalkyl that different amounts of embodiment 3 synthesizes is added in into base slurry
Change starch sample, respectively obtain saturated salt-water drilling fluid.High-speed stirred 5min, aged at room temperature 16h, then high-speed stirred 5min, point
Property of drilling fluid is not measured, the results are shown in Table 3, table 3 is the performance of 16 gained saturated salt-water drilling fluid of embodiment.Institute is shown by table 3
Obtain sulfoalkylation starch has apparent filtrate reducing effect in saturated salt-water drilling fluid.
The performance of 3 embodiment of table, 16 gained saturated salt-water drilling fluid
The anticalcium ability of 3 gained sulfoalkylation starch of embodiment is detected, and is carried out pair with carboxymethyl starch (CMS)
Than.As a result referring to Fig. 1, Fig. 1 is CaCl in the saturated salt-water drilling fluid containing 1.5% sample of the embodiment of the present invention2Dosage is to boring
The influence of well liquid filter loss.From figure 1 it appears that the anticalcium ability of sulfoalkylation starch of the present invention is significantly better than CMS.
The above is only the preferred embodiment of the present invention, it is noted that for making the professional technique of the art
Personnel without departing from the technical principles of the invention, are that by a variety of modifications to these embodiments, and these
Modification also should be regarded as the scope that the present invention should protect.
Claims (10)
1. a kind of sulfoalkylation starch, which is characterized in that reacted in alkaline conditions by starch and water-soluble halogenated esilate
It is made；The sulfoalkylation starch contains ethanesulfonic acid base and hydroxyl.
2. sulfoalkylation starch according to claim 1, which is characterized in that the starch is selected from cornstarch, potato forms sediment
One or more in powder, tapioca and wheaten starch.
3. sulfoalkylation starch according to claim 1, which is characterized in that the halogenated esilate of water solubility is selected from 2-
Chloro ethanesulfonic acid sodium, 2- bromoethane sulfonic acids sodium or 2- iodo ethanesulfonic acid sodium.
4. sulfoalkylation starch according to claim 1, which is characterized in that the sulfonation degree of the sulfoalkylation starch is
0.1~0.6；The viscosity of 1wt% sulfoalkylation amidins is 50~200mPas.
5. a kind of preparation method of sulfoalkylation starch, comprises the following steps：
In alkaline conditions, starch and water-soluble halogenated esilate in aqueous solvent are reacted, obtains sulfoalkylation
Starch.
6. preparation method according to claim 5, which is characterized in that the aqueous solvent is the mixing formed by alcohol and water
Solution.
7. preparation method according to claim 6, which is characterized in that it is described reaction under the conditions of existing for catalyst into
Row, the catalyst are selected from benzyltriethylammoinium chloride, tetrabutylammonium bromide, tetrabutylammonium chloride, 4-butyl ammonium hydrogen sulfate, three
One or more in octylmethylammonium chloride, dodecyl trimethyl ammonium chloride and tetradecyl trimethyl ammonium chloride.
8. preparation method according to claim 7, which is characterized in that the starch, water-soluble halogenated esilate and urge
The molar ratio of agent is 1:(0.505~1.05):(0.025~0.05).
9. the preparation method according to any one of claim 5~8, which is characterized in that the temperature of the reaction for 35~
70 DEG C, the time of the reaction is 1h~10h.
10. a kind of drilling fluid, including inorganic agent, which is characterized in that the inorganic agent includes any one of Claims 1 to 4 institute
Sulfoalkylation starch made from the preparation method any one of sulfoalkylation starch or claim 5~9 stated.
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| CN113621117A (en) * | 2020-05-08 | 2021-11-09 | 中石化石油工程技术服务有限公司 | Environment-friendly resin filtrate reducer for drilling fluid and preparation method and application thereof |
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