CN108997508A - A kind of drilling fluid modified starch anti-sloughing agent and preparation method thereof - Google Patents
A kind of drilling fluid modified starch anti-sloughing agent and preparation method thereof Download PDFInfo
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- CN108997508A CN108997508A CN201710418230.3A CN201710418230A CN108997508A CN 108997508 A CN108997508 A CN 108997508A CN 201710418230 A CN201710418230 A CN 201710418230A CN 108997508 A CN108997508 A CN 108997508A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B31/00—Preparation of derivatives of starch
- C08B31/02—Esters
- C08B31/04—Esters of organic acids, e.g. alkenyl-succinated starch
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B31/00—Preparation of derivatives of starch
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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
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
Abstract
The present invention relates to a kind of drilling fluid modified starch anti-sloughing agents and preparation method thereof in oilfield additive field.The modified starch anti-sloughing agent is reacted by starch, sulfonyl agent and aminating agent for raw material, a kind of natural modified product obtained by enzymatic reaction, sulphur esterification and aminating reaction.Primary amine group is introduced into the glucose building blocks of starch by the present invention, make starch that there is the stronger ability for inhibiting bentonite pulping, the aquation dispersion and expansion for hindering mud shale stratum are collapsed, temperature resistance is up to 150 DEG C, it can effectively safeguard wellbore stability, and prepare that raw material sources are extensive, and preparation method is simple, easy industrialization promotion.
Description
Technical field
The present invention relates to oilfield additive fields, furtherly, be related to a kind of drilling fluid modified starch anti-sloughing agent and its
Preparation method.
Background technique
In recent years, energy availability and demand crisis increasingly increases, and the unconventional petroleum resources such as Deep Oil And Gas Exploration resource and shale gas are opened
Hair, which becomes, solves the contradictory effective way of energy availability and demand.But hard brittle shale exists extensively in deep and shale formation,
And the frequency and degree of borehole well instability are higher, become the important problem for restricting petrol resources exploitation.According to statistics, drilling cost is whole
Shared ratio is up to 50%~80% in a exploration and development, and by being wasted in institute in drilling well totle drilling cost caused by borehole well instability
The ratio accounted for is up to 10%~20%, this is also meaned that worldwide, and the loss as caused by borehole well instability exists every year
Shared ratio has had reached 5%~16% in oil-gas exploration and development totle drilling cost.Borehole well instability not only increases drilling cost, together
When influence to survey the successful exploitation of cementing quality and petroleum resources again.Therefore, keep wellbore stability to reduce In Oil Field Exploration And Development at
This, increases economic efficiency and plays a crucial role.
It is to improve one of the important means of wellbore stability using chemical method enhancing drilling fluid inhibition, i.e., into drilling fluid
A certain amount of inhibition anti-sloughing agent, which is added, can play the role of the firm borehole wall.Currently, asphalt product is most common drilling fluid
With anti-sloughing agent, however, that there are fluorescent values is high, production technology is complicated, softening point control is difficult, pollution environment and product for this kind of product
The disadvantages of quality is influenced by the places of origin of raw materials.Starch, as important natural products, with wide, nontoxic, the easy modification in source and easily
The advantages that biodegradable is one of the hot research direction of environmentally friendly class additive for drilling fluid.In recent years, Scomi company has studied
A kind of entitled Opt-Star plus modified starch, mainly as fluid loss additive come using and have certain anti-collapse function concurrently；
The Baroid of Halliburton develops a kind of N-Drilling HT Plus nonionic modified starch, filters mainly as drop
Lose agent come using and have certain anti-collapse function concurrently；MI under Schlumberger develops a kind of amphoteric ion type Duo-Flo
TM modified starch, mainly as fluid loss additive come using and have certain anti-collapse function concurrently.
Summary of the invention
In order to solve the above-mentioned problems in the prior art, the present invention proposes that a kind of drilling fluid modified starch is anti-collapse
Agent.A kind of drilling fluid modified starch anti-sloughing agent and preparation method thereof is related in particular to, is bored for meeting borehole well instability stratum
The needs of well construction.
One of the object of the invention is to provide a kind of drilling fluid modified starch anti-sloughing agent, the modified starch anti-sloughing agent be by
Starch, sulfonyl agent and aminating agent are a kind of natural modified product that raw material reacts, and general structure can be selected from following logical
At least one of formula:
Wherein, R CnH2n, the integer that n is 2~10, preferably n≤5.
The second object of the present invention is to providing a kind of preparation method of drilling fluid modified starch anti-sloughing agent, including following step
It is rapid:
(1), enzymatic starch cream prepares Partial digestion starch；
(2), the Partial digestion starch and acid-binding agent, sulfonyl agent reaction generation sulfonic acid esters step (1) obtained
Intermediate product；
(3), the sulfonic acid esters intermediate product and aminating agent, precipitating reagent step (2) obtained reacts, and is made final and produces
The modified starch anti-sloughing agent of drilling fluid described in object.
Specifically,
The step (1), which can comprise the following steps that, mixes starch with water, and compound concentration is 10.0wt%~20.0wt%
Starch milk, be heated to 50~70 DEG C, be added alpha-amylase in the starch milk, the additional amount of the alpha-amylase is starch
It is warming up to 100~110 DEG C of 1.0~2.0h of inactivation after 0.01wt%~0.50wt% of dosage, 0.5~6.0h of sustained response, obtains
To enzymatic degradation of starch lotion, dry (drying temperature can be 40~60 DEG C) to constant weight obtains the Partial digestion starch, spare.
The effect of the step (1): it in amylase and under conditions of apply certain temperature, reduces unformed in starch granules
The strand aggregation extent in region, so that starch molecular chain absorbs energy production strenuous vibration, the double-spiral structure of molecule is at this
The hydrogen bond relaxation of molecule interchain, the double-spiral structure that starch molecular chain is formed solve under kind strenuous vibration and diastatic action
Rotation, the crystalline texture of such starch will be destroyed, and improve the stretching of strand in the solution, the active reaction in molecule
Group (i.e. hydroxyl) quantity increases, and improves graft reaction efficiency.
The step (2) can comprise the following steps that the Partial digestion starch for obtaining step (1) and acid-binding agent are mixed
It closes, stirs 30~60min in an inert atmosphere, control 0~15 DEG C of reaction temperature；Sulfonyl agent, control reaction are added dropwise thereto
Time is 12~16h, and reaction product is filtered, takes filtrate soluble in water, lower liquid is taken after stratification, be evaporated under reduced pressure to obtain the final product
To the sulfonic acid esters intermediate product.The effect of the step (2): the step is by Partial digestion starch and sulfonyl agent
Reaction prepares sulfonic acid esters intermediate product, prepares to introduce amido in the glucose glycosidic structure unit of starch in next step.
Reaction equation is as follows:
The step (3) can comprise the following steps that aminating agent and precipitant mix, stirs in inert environments, can be
30~60min controls 75~85 DEG C of reaction temperature；The sulfonic acid esters intermediate product that step (2) obtains is added to carry out instead
It answers, the control reaction time is 4~6h；After reaction, lower layer's brown color thick liquid is removed, upper solution is dissolved in water
In, lower liquid is taken after stratification, vacuum distillation obtains final product.
Reaction equation is as follows:
Wherein,
Concentration expressed in percentage by weight of the Partial digestion starch in acid-binding agent (refers to that starch dosage accounts for starch and acid-binding agent
The ratio of total dosage) it is 5.0%~20.0%, preferably 5.0%~12.0%；
The weight ratio of the Partial digestion starch and sulfonyl agent is (2~4): 1.
The acid-binding agent is at least one of pyridine, triethylamine；The sulfonyl agent is to methylsufonyl chloride.
The aminating agent is selected from the compound with having structure general formula:
HO-R-NH2
Wherein, R CnH2n, the integer that n is 2~10, preferably n≤5；
The weight of the sulfonic acid esters intermediate product is 3~6 times of aminating agent weight.
Concentration expressed in percentage by weight of the aminating agent in precipitating reagent (refers to that the dosage of aminating agent accounts for aminating agent and precipitating reagent dosage
The sum of ratio) be 2.0%~5.0%.
The precipitating reagent is selected from least one of benzene, toluene and hexamethylene.
Effect of the invention
The present invention relates to a kind of drilling fluid modified starch anti-sloughing agents and preparation method thereof, and the anti-sloughing agent is by starch, sulphur
Acylating agent and aminating agent are raw material reaction, and the one kind obtained by enzymatic reaction, sulphur esterification and aminating reaction is natural modified
Product.Primary amine group is introduced into the glucose building blocks of starch by the present invention, due to the p electron cloud on primary amine groups N atom
Easily receive proton and is in electropositive, and the end face of clay particle and surface are negatively charged, are adsorbed on clay by electrostatic interaction
Adjacent clay layer is bound together by the surface of particle, is hindered contact of the water easily hydrated clay with hydrone, that is, is hindered
Aquation dispersion and expansion of the easily hydrated clay in system；In addition, unreacted in glucose building blocks in starch molecular chain
Hydroxyl also Hydrogen Binding Adsorption can occur with surface of clay and the hydroxyl of end face, to further enhance suction-operated, thus
The effect for inhibiting easily hydrated clay pulping and hindering mud shale stratum aquation dispersion and expansion is enhanced, there is starch stronger
The ability for inhibiting bentonite pulping hinders the aquation of mud shale stratum to disperse and expand to collapse, and temperature resistance, can be effective up to 150 DEG C
Safeguard wellbore stability.There is stronger anti-collapse property, thermal stability and environmental protection in the anti-collapse agent molecule of modified starch provided by the invention
Property, raw material sources are extensive, and preparation method is simple, easy industrialization promotion.
Detailed description of the invention
Fig. 1 is that testing for embodiment 5 starches 3 turns of readings with bentonite dosage change curve.
Specific embodiment
Below with reference to embodiment, the present invention is further illustrated.But the present invention is not restricted by the embodiments.
Embodiment 1
40.0g starch and 160mL water are mixed to get to the starch milk of 20.0wt%, the starch is heated in 60 DEG C of water-bath
Cream；0.2g alpha-amylase is added in the starch milk of above-mentioned heat, is warming up to 100 DEG C of inactivation 2.0h after sustained response 6.0h, obtains
Enzymatic degradation of starch lotion, drying to constant weight obtains Partial digestion starch, spare.
28.0g Partial digestion starch and 532g triethylamine are fitted into the reactor with stirring, condensation and reflux unit,
30min is stirred under conditions of logical nitrogen, controls 0 DEG C of reaction temperature.7.0g is added dropwise into reactor to methylsufonyl chloride, control is anti-
It is 16h between seasonable.Reaction product is filtered, filtrate is soluble in water, and lower liquid is taken after stratification, and vacuum distillation obtains sulphur
Esters of gallic acid intermediate product.
2.24g 2 hydroxy ethylamine and 109.76g benzene are fitted into the reactor with stirring, condensation and reflux unit, led to
60min is stirred under conditions of nitrogen, controls 75 DEG C of reaction temperature.6.72g sulfonic acid esters intermediate product is added in reactor,
The control reaction time is 6h.After reaction, lower layer's brown color thick liquid is removed, upper solution is dissolved in water, is stood
Lower liquid is taken after layering, vacuum distillation obtains drilling fluid modified starch anti-sloughing agent described in final product.
Embodiment 2
30.0g starch and 270mL water are mixed to get to the starch milk of 10.0wt%, the starch is heated in 60 DEG C of water-bath
Cream；0.06g alpha-amylase is added in the starch milk of above-mentioned heat, is warming up to 110 DEG C of inactivation 1.0h after sustained response 2.0h, obtains
Enzymatic degradation of starch lotion, drying to constant weight obtains Partial digestion starch, spare.
By 20.0g Partial digestion starch and 200g pyridine is fitted into stirring, condense and reflux unit reactor in,
30min is stirred under conditions of logical nitrogen, controls 15 DEG C of reaction temperature.6.5g is added dropwise into reactor to methylsufonyl chloride, control
Reaction time is 12h.Reaction product is filtered, filtrate is soluble in water, and lower liquid is taken after stratification, and vacuum distillation obtains
Sulfonic acid esters intermediate product.
2.56g isopropanolamine and 100g toluene are fitted into the reactor with stirring, condensation and reflux unit, nitrogen is led to
Under conditions of stir 60min, control 85 DEG C of reaction temperature.15.36g sulfonic acid esters intermediate product is added in reactor, is controlled
Reaction time processed is 4h.After reaction, lower layer's brown color thick liquid is removed, upper solution is dissolved in water, stands and divides
Lower liquid is taken after layer, vacuum distillation obtains drilling fluid modified starch anti-sloughing agent described in final product.
Embodiment 3
30.0g starch and 170mL water are mixed to get to the starch milk of 15.0wt%, the starch is heated in 60 DEG C of water-bath
Cream；0.03g alpha-amylase is added in the starch milk of above-mentioned heat, is warming up to 105 DEG C of inactivation 1.5h after sustained response 1.5h, obtains
Enzymatic degradation of starch lotion, drying to constant weight obtains Partial digestion starch, spare.
By 20.0g Partial digestion starch and 180g pyridine is fitted into stirring, condense and reflux unit reactor in,
45min is stirred under conditions of logical nitrogen, controls 10 DEG C of reaction temperature.10.0g is added dropwise into reactor to methylsufonyl chloride, control
Reaction time is 14h.Reaction product is filtered, filtrate is soluble in water, and lower liquid is taken after stratification, and vacuum distillation obtains
Sulfonic acid esters intermediate product.
4.68g 2- amino n-butanol and 188g hexamethylene are packed into the reactor with stirring, condensation and reflux unit
In, 45min is stirred under conditions of logical nitrogen, controls 82 DEG C of reaction temperature.18.72g sulfonic acid esters intermediate product is added to instead
It answers in device, the control reaction time is 4.5h.After reaction, lower layer's brown color thick liquid is removed, upper solution is dissolved in
In water, lower liquid is taken after stratification, vacuum distillation obtains drilling fluid modified starch anti-sloughing agent described in final product.
Embodiment 4
48.0g starch and 352mL water are mixed to get to the starch milk of 12.0wt%, the starch is heated in 60 DEG C of water-bath
Cream；0.12g alpha-amylase is added in the starch milk of above-mentioned heat, is warming up to 105 DEG C of inactivation 2.0h after sustained response 1.2h, obtains
Enzymatic degradation of starch lotion, drying to constant weight obtains Partial digestion starch, spare.
By 35.0g Partial digestion starch and 466g pyridine is fitted into stirring, condense and reflux unit reactor in,
30min is stirred under conditions of logical nitrogen, controls 8 DEG C of reaction temperature.10.0g is added dropwise into reactor to methylsufonyl chloride, control
Reaction time is 12.5h.Reaction product is filtered, filtrate is soluble in water, and lower liquid is taken after stratification, is evaporated under reduced pressure to obtain the final product
To sulfonic acid esters intermediate product.
7.88g n-propanolamine and 375g toluene are fitted into the reactor with stirring, condensation and reflux unit, nitrogen is led to
Under conditions of stir 30min, control 80 DEG C of reaction temperature.25.77g sulfonic acid esters intermediate product is added in reactor, is controlled
Reaction time processed is 5.0h.After reaction, lower layer's brown color thick liquid is removed, upper solution is dissolved in water, is stood
Lower liquid is taken after layering, vacuum distillation obtains drilling fluid modified starch anti-sloughing agent described in final product.
Embodiment 5
Modified starch anti-sloughing agent inhibits the performance test of bentonite pulping
(the document source of test method are as follows: Zhong Hanyi, Qiu Zhengsong, Huang Weian wait amine shale control agent feature and grind
Study carefully progress, [J] oil drilling technology, 2010,38 (1): 104~108.)
The drilling fluid of embodiment 1, embodiment 2, embodiment 3 and embodiment 4 is made respectively with modified starch anti-sloughing agent
The standby solution for being 0.5% at concentration expressed in percentage by weight, by clear water, 7.0%KCl, 0.5%Ultrahib (M-ISwaco company of the U.S.
Production) and above-mentioned 4 kinds of anti-collapse agent solutions be added separately to weight fraction for 5.0% second level bentonite, high-speed stirred
It is cooled to room temperature after 20.0min, 150 DEG C of rolling aging 16.0h, high-speed stirred 20.0min, is bored with six fast rotary viscosity design determinings
Well liquid rheological parameter.It tests, adds 5.0% second level bentonite, be cooled to room temperature after 150 DEG C of rolling aging 16.0h, it is high
Speed stirring 20.0min, again with six fast rotary viscosity design determining action and rheological parameter of mud, the above operation repeatedly, until six
Until fast rotational viscometer does not detect degree, experimental result is as shown in Figure 1.
As shown in Figure 1, in clear water, with the increase of bentonite dosage, 3 turns of readings are increased rapidly, and illustrate that bentonite exists
There is stronger hydration swelling peptizaiton in clear water, be conducive to bentonite architecture space network structure.In comparison, work as swelling
When native dosage respectively reaches 15.0%, just slowly rises added with 3 turns of readings of the experiment slurry of 7.0%KCl, illustrate that KCl passes through crystalline substance
Bentonitic hydration can be effectively suppressed in lattice fixed function, and concentration is higher, and inhibiting effect is more obvious.With clear water and 7.0%
The experiment slurry of KCl is compared, and under the conditions of identical bentonite dosage, 0.5% drilling fluid modified starch anti-sloughing agent is added
Reduced levels are maintained always with 3 turns of readings of the experiment slurry of Ultrahib, so as to judge drilling fluid of the present invention
There is the stronger performance for inhibiting bentonite aquation pulping with modified starch anti-sloughing agent.
Embodiment 6
Modified starch anti-sloughing agent inhibits the test of shale hydration dispersion performance
(the document source of test method are as follows: Luo Chunzhi, Zeng Fan are washed, Xiang Xingjin, wait drilling fluid and its inorganic agent inhibition
The desk research oil drilling technology of evaluation method, 2000,28 (1): 35-36.)
6~10 mesh landwaste of shale (landwaste northeast dragon and phoenix mountain mists Tian Yaojia group stratum) 40.0g is respectively put into and is equipped with
Clear water, 7.0%KCl, 0.5%Ultrahib, 0.5% coating inhibitor FA-367 (coating inhibitor commonly used in the prior art
Product, a kind of commercial disignation FA-367, amphoteric ion type polymer) and 0.5% Examples 1 to 4 described in drilling fluid be modified
It in the high temperature ageing tank of starch anti-sloughing agent, takes out, is cooled to room temperature after 150 DEG C of rolling aging 16.0h, successively cross 28 meshes and 40
Mesh recycles landwaste, and 105 DEG C drying to constant weight, weighs landwaste quality, calculates rolling rate of recovery, and experimental result is as shown in table 1.
The landwaste rolling rate of recovery of the different inhibitor of table 1
As can be seen from Table 1, compared with clear water, 0.5%FA-367,0.5%Ultrahib and 7.0%KCl, added with 4 kinds
The experiment of the 0.5% drilling fluid modified starch anti-sloughing agent starched the rolling rate of recovery of 28 meshes and crossed the rolling of 40 meshes
The rate of recovery is higher, illustrates that the different modified starch anti-sloughing agents of of the invention 4 kinds can effectively ensure that the integrality of landwaste, is more advantageous to and mentions
High drilling shaft lining stability.
Claims (10)
1. a kind of drilling fluid modified starch anti-sloughing agent includes at least one in following general formula (I), (II), (III) compound
Kind:
Wherein, R CnH2n, the integer that n is 2~10, preferably n≤5.
2. a kind of drilling fluid modified starch anti-sloughing agent according to claim 1, it is characterised in that by comprising the steps of
Method be prepared:
(1), enzymatic starch cream prepares Partial digestion starch；
(2), the Partial digestion starch and acid-binding agent, sulfonyl agent step (1) obtained, which reacts, to be generated among sulfonic acid esters
Product；
(3), the sulfonic acid esters intermediate product and aminating agent, precipitating reagent step (2) obtained reacts, and final product institute is made
State drilling fluid modified starch anti-sloughing agent.
3. a kind of preparation method of drilling fluid modified starch anti-sloughing agent according to claim 1 or 2, including following step
It is rapid:
(1), Partial digestion starch is prepared；
(2), the Partial digestion starch and acid-binding agent mixing step (1) obtained, then sulfonyl agent reaction is added dropwise and generates sulphur
Esters of gallic acid intermediate product；
(3), the sulfonic acid esters intermediate product and aminating agent that step (2) are obtained, precipitant mix reaction, are made final and produce
The modified starch anti-sloughing agent of drilling fluid described in object.
4. a kind of preparation method of drilling fluid modified starch anti-sloughing agent according to claim 3, it is characterised in that: described
For step (1) the following steps are included: starch is mixed with water, compound concentration is the starch milk of 10.0wt%~20.0wt%, heating
To 50~70 DEG C, alpha-amylase is added in the starch milk, the additional amount of the alpha-amylase is starch dosage
It is warming up to 100~110 DEG C of inactivations after 0.01wt%~0.50wt%, 0.5~6.0h of sustained response, obtains enzymatic degradation of starch cream
Liquid, drying to constant weight obtain the Partial digestion starch.
5. a kind of preparation method of drilling fluid modified starch anti-sloughing agent according to claim 3, it is characterised in that: described
Step (2) is the following steps are included: the Partial digestion starch that step (1) is obtained is mixed with acid-binding agent, in inert environments
Lower stirring controls 0~15 DEG C of reaction temperature；Sulfonyl agent is added dropwise thereto, the control reaction time is 12~16h, and reaction is produced
Object filtering, takes filtrate soluble in water, and lower liquid is taken after stratification, and vacuum distillation obtains producing among the sulfonic acid esters
Object.
6. a kind of preparation method of drilling fluid modified starch anti-sloughing agent according to claim 3, it is characterised in that: described
Step (3) stirs in inert environments the following steps are included: by aminating agent and precipitant mix, controls reaction temperature 75~85
℃；It adds the sulfonic acid esters intermediate product that step (2) obtains to be reacted, the control reaction time is 4~6h；Reaction knot
Shu Hou removes lower layer's brown color thick liquid, upper solution is dissolved in water, and lower liquid is taken after stratification, and decompression is steamed
It evaporates and obtains drilling fluid modified starch anti-sloughing agent described in final product.
7. a kind of preparation method of drilling fluid modified starch anti-sloughing agent according to claim 3, it is characterised in that:
Concentration expressed in percentage by weight of the Partial digestion starch in acid-binding agent be 5.0%~20.0%, preferably 5.0%~
12.0%；
The weight ratio of the Partial digestion starch and sulfonyl agent is (2~4): 1.
8. a kind of preparation method of drilling fluid modified starch anti-sloughing agent according to claim 3, it is characterised in that:
The acid-binding agent is at least one of pyridine, triethylamine；
The sulfonyl agent is to methylsufonyl chloride.
9. special according to a kind of described in any item preparation methods of drilling fluid modified starch anti-sloughing agent of claim 3~8
Sign is: the aminating agent is selected from least one of the compound with having structure general formula:
HO-R-NH2
Wherein, R CnH2n, the integer that n is 2~10, preferably n≤5；
Concentration expressed in percentage by weight of the aminating agent in precipitating reagent is 2.0%~5.0%；
The weight of the sulfonic acid esters intermediate product is 3~6 times of aminating agent weight.
10. according to a kind of described in any item preparation methods of drilling fluid modified starch anti-sloughing agent of claim 3~8,
It is characterized in that:
The precipitating reagent is at least one of benzene, toluene and hexamethylene.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110511321A (en) * | 2019-07-17 | 2019-11-29 | 安徽中科日升科技有限公司 | A kind of modified polysaccharide polymers, preparation method and applications |
| CN110511321B (en) * | 2019-07-17 | 2022-02-08 | 安徽中科日升科技有限公司 | Modified polysaccharide polymer, preparation method and application thereof |
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