CN104449596B - A kind of polyether polyol shale control agent and its preparation and application - Google Patents

A kind of polyether polyol shale control agent and its preparation and application Download PDF

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CN104449596B
CN104449596B CN201310418040.3A CN201310418040A CN104449596B CN 104449596 B CN104449596 B CN 104449596B CN 201310418040 A CN201310418040 A CN 201310418040A CN 104449596 B CN104449596 B CN 104449596B
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polyether polyol
shale
drilling fluid
control agent
reaction
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CN104449596A (en
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刘晓栋
马永乐
马学勤
张勇
刘建军
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China National Petroleum Corp
CNPC Offshore Engineering Co Ltd
Tianjin CNPC Boxing Engineering Technology Co Ltd
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CNPC Offshore Engineering Co Ltd
Tianjin CNPC Boxing Engineering Technology Co Ltd
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    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
    • C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
    • C08G65/26—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds
    • C08G65/2603—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing oxygen
    • C08G65/2606—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing oxygen containing hydroxyl groups
    • C08G65/2609—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing oxygen containing hydroxyl groups containing aliphatic hydroxyl groups
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
    • C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
    • C08G65/26—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds
    • C08G65/2642—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds characterised by the catalyst used
    • C08G65/2645—Metals or compounds thereof, e.g. salts
    • C08G65/2648—Alkali metals or compounds thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
    • C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
    • C08G65/30—Post-polymerisation treatment, e.g. recovery, purification, drying
    • 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
    • C09K8/04—Aqueous well-drilling compositions
    • C09K8/14—Clay-containing compositions
    • C09K8/18—Clay-containing compositions characterised by the organic compounds
    • C09K8/22—Synthetic organic compounds
    • C09K8/24—Polymers

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Abstract

The present invention relates to a kind of polyether polyol shale control agent and its preparation and application, which is that formula is RO- (CH2CH2O)m(CH2CH(CH3)O)nH, wherein R=C1‑6Polyhydroxyalkanes, m&n=1,2 ... 20；M+n >=4, molecular weight is between 500~2000；Preparation process makees catalyst, addition polymerization ethylene oxide using polyalcohol as initiator using KOH（EO）And propylene oxide（PO）, neutralized with acid after reaction, adsorbent absorption, filtered with filter, shale-control agent for drilling fluid polyether polyol is made；This polyether polyol shale control agent, which has, a variety of effects, and low toxicity, easily biological-degradable such as inhibits hydration and expansion of clay, stabilizing borehole, improves drilling fluid lubricating performance, prevents bit balling, meets green technology requirement.

Description

A kind of polyether polyol shale control agent and its preparation and application
Technical field
The present invention relates to a kind of oil and gas field drilling fluid polyether polyol shale control agents and preparation method thereof.
Background technology
The stabilization of strong retraction and strong stress mud shale is always the problem of drilling liquid technology, in the past frequently with oil base drilling fluid Overcome, however be defective using oil base drilling fluid in some cases, such as the content one of aromatic hydrocarbons in oil base drilling fluid As up to 30-50%, especially polynuclear aromatic hydrocarbons account for 20%, have very strong fluorescence, influence geological logging, and these aromatic hydrocarbons groups Part marine organisms are had with very high toxicity, cannot be directly discharged into marine, especially receives environmental protection policy in drilling liquid technology And law, regulation limit in the case of, the use of oil base drilling fluid is increasingly restricted, research meet drilling engineering technology and More aobvious very necessary of water base drilling fluid system that environmental protection needs.Although water-base drilling fluid more meets compared with oil base drilling fluid Environmental requirement, however the shale inhibition of water-base drilling fluid can differ greatly with oil base drilling fluid, technically, water be met when boring When quick property mud shale, shale has very strong compatibility to water, it can be made to expand after shale absorption water and changed in rock Learn variation and generate the stress for weakening stratum, it is thus possible to lead to wellbore aquation undergauge or cave-in, chip off-falling, occur bit freezing, Recycle unsmooth Deng down-hole accidents, in addition, inferior hole quality may interfere make a trip, completion logging, setting of casing, well cementation etc. Completion practice seriously affects bit speed.
It is external from the initial stage nineties in terms of improving water-base drilling fluid to the rejection of shale, just use low molecular weight Polyhydroxy-alcohol simple in structure, such as：The mud shale that ethylene glycol, propylene glycol, glycerine etc. successfully solve water-sensitive strata is swollen The probing problem of swollen problem and environmental sensitivity region makes us have tentatively polyhydroxy substance to the inhibiting mechanism of mud shale Understanding.Then during the decade, researcher deeply grinds the effect of hydroxyl, hydrogen bond in inhibiting Shale Hydration dispersion Study carefully, in the case where reducing dosage, improving the guidance of drilling fluid comprehensive performance thinking, focus of attention is shifted to and ethylene glycol, propylene glycol Polyoxyethylene alcohol, polyoxypropylene alcohol with similar chemical structure, the generation of cloud point is for improving it in drilling fluid Shale inhibition can make people produce keen interest to the structure of substance of this kind with greasy property, and then people are again sight Shift to the SYNPERONIC PE/F68 using polyhydroxy-alcohol as initiator, i.e., oligomeric polyoxyethylene ether and polyoxypropylene Ether, abbreviation polyether polyol, product form is increasingly extensive, drilling fluid comprehensive performance such as shale inhibition energy, greasy property, anti-mud The indices such as packet performance, low bio-toxicity also step up, and become a kind of important water-base drilling fluid inorganic agent.
Polyether polyol is the oligomer of terminal hydroxy group, is by propylene glycol, glycerine, trimethylolpropane, pentaerythrite, xylose The polyalcohols such as alcohol, sorbierite, mannitol are initiator and ethylene oxide（EO）, propylene oxide（PO）, epoxy butane（BO）Deng It is made through sudden reaction in the presence of catalyst.By changing alkylene oxide feed way（Mixing adds or separately adds）, dosage ratio, charging The conditions such as order produce the polyether polyol of various performances.
Polyether polyol is in drilling fluid as a kind of shale-control agent for drilling fluid haveing excellent performance, water-soluble lubricating Agent, anti-mud drum detergent, with being at home and abroad widely used in land, marine drilling, deep-well, extended horizontal well and water sensitivity The probing of layer.In recent years, oil base drilling fluid is being substituted, is solving environment sensitive sex chromosome mosaicism；Deepwater drilling improves drilling fluid low temperature stream Denaturation inhibits gas hydrates to generate；Unconventional energy resource drilling well, stabilizing borehole, protection reservoir, is obtained for good answer With.
Foreign countries began to the molecular structure research for being dedicated to drilling fluid polyoxyethylene, polyoxypropylene polyol from 1940 With properties of product sustained improvement, to reach the performance of oil base drilling fluid.Currently, the EO-PO blocks for having formd a variety of series are poly- Ethoxylated polyhydric alcohol shale control agent extends on polyoxy alkene copolymer and introduces different groups in recent years, and it is novel poly- to form some Ether derivant.Such as：U.S.'s Hensel steps the artificial solution such as chemical company Klein H R and uses drilling fluid caused by inorganic salt inhibitor The problems such as flocculation, dehydration become larger, toxicity, studies a kind of polyoxyethylene poly-oxygen propylene aether amine, inhibits as a kind of good clay Agent, and drilling fluid rheology performance is not influenced, molecular structure H2N-X-(OC H2CH2)x-(OCH2CH(CH3))y-NH2.M-I is public Department Bailey L are the environmental issue solved using oil base drilling fluid, from ICI chemical industrial companies BRIJ series of surfactants In a kind of preferred fatty alcohol polyoxyethylene ether, molecular structure is RO- (CH2CH2O)nH and inorganic salts synergistic effect, have Preferably prevent hydration and expansion of clay from acting on.Iranian Pars drilling fluids company Chegny S J et al. have studied a kind of emulsion multicomponent Alcohol drilling fluid system substitutes oil base drilling fluid, solves environment influence, reservoir wound that it brings to the hypotonic oilfield drilling of Iran Harmful, high cost problem, polyol molecule structure are RO- (CH2CH2O)m(CH2CH(CH3)O)nH.Rutgers Organics are public Take charge of Lochel F P et al. preferred Rutgers Organics companies BP261 products and BASF AG's Pluronic series production Product, molecular structure are HO- (EO)x-(PO)y-(EO)z, and with aliphatic acid mix, synthesized function admirable be suitable for it is water base, Oil base drilling fluid with lubricator, and has good hole stability effect.Baker Hughes Inc Lafayette S M et al. are studied It is a series of turbid from Olympic chemical company, BASF AG, Baker Co., Ltd, joint C.-Chem AG and Shell Co. Ltd water solubility Point is 30~90 DEG C of polyether polyol, and products molecule structure is mainly PEP three blocks RO- (PO)x-(EO)y-(PO)z.Shellfish Gram Hughes Electronics Norfleet J E et al. have studied joint C.-Chem AG UCON50HB, UCON75H and DOW Chemical DOW15 series SYNPERONIC PE/F68s, as a kind of viscosity modifier of salt-water drilling fluid, shale control agent.
China began to develop EO-PO block polyether polyols the beginning of the nineties, and developed a set of polyalcohol drilling fluid (PEM) system, at sea safely and fast drilling well, protection oil-gas Layer, lubrication and environmental protection etc. achieve very well oil gas field Effect, established sea environment-friendly type water-base drilling fluid basis.Subsequent studies in China scholar is again modified polyalcohol, such as Xiao Organosilicon modifier is added in polyether polyol by steady hair et al., has synthesized organosilicon modified polyether polyol lubricant Silicon- 1；Luo Yue has synthesized ethylene oxide and propylene oxide block polyether polyol to mix polyhydroxy-alcohol as initiator, has developed new Type water-based collapse-proof lubricant JHG；China University Of Petroleum Beijing（East China）Lv Kaihe, Qiu Zhengsong et al. are starting with propylene glycol, glycerine Agent, with EO/PO copolymerizations Polyether Lubricant SYT-2；Shandong University Chu Ze rocs, in order to explore the poly- of different structure Influence of the ethoxylated polyhydric alcohol to its rejection, has chosen some EO/PO random copolymers and block copolymer is tested, excellent Have selected that molecular structure is suitable, the copolymer of the good EO/PO of property of drilling fluid；Shandong get Shun Yuan petroleum science and technologies company passes through polyethers Polyalcohol introduces amido, has synthesized a kind of high performance water-based drilling fluid shale control agent AP-1.The exploitation of these products is all very big The type that China's polyalcohol shale control agent product is enriched in degree, promotes the raising of product quality.
But China oil field drilling fluid is chaotic with polyether polyol molecular structure at present, effective component content is insufficient, production Quality is unstable, by experimental analysis in more than the 100 kind polyether polyol sample rooms to field application, it is found that China's polyethers is more There are some quality problems for first alcohol overwhelming majority product, such as：(1) effective component content is insufficient；(2) poorly water-soluble, no cloud point； (3) the above shale inhibition of cloud point temperature can be undesirable with greasy property；(4) cause drilling fluid foaming, thickening, to drilling well liquid stream Becoming performance and dehydration influences greatly；(5) there is certain bio-toxicity, it is difficult to degrade.For China's drilling fluid polyether polyol skill Art present situation and existing product quality problem develop a kind of environmental-friendly, exsertile EO-PO block copolymerizations of shale inhibition Polyether polyol, to solve the Wellbore Stability of strong retraction and strong stress mud shale.
Invention content
The object of the present invention is to provide a kind of drilling fluid polyether polyol shale control agent and preparation method thereof, the drilling wells Liquid shale control agent rejection and greasy property protrude, and are not influenced on drilling fluid rheology performance and dehydration, and less toxic, easy It is biodegradable, environmentally friendly, it is suitable for fresh water, seawater, the various drilling fluid systems of brine, comprehensive performance is good.
A kind of polyether polyol shale control agent inhibiting hydration and expansion of clay dispersion of the present invention, it is characterised in that Its molecular structure is formula 1.
Wherein R=C1-6Polyhydroxyalkanes, m&n=1,2 ... 20；M+n >=4, molecular weight is between 500~2000.
The preparation method of the polyether polyol shale control agent, it is characterised in that：Using polyalcohol as initiator, use KOH makees catalyst, addition polymerization ethylene oxide（EO）And propylene oxide（PO）, neutralized with acid after reaction, adsorbent absorption, use filter Filtering, is made shale-control agent for drilling fluid polyether polyol.Synthesis technology uses batch technology, it is desirable that the stirring of reaction kettle makes Material consumingly back mixing, the material of input are quickly uniformly mixed, are reacted in time.
EO sections of polymeric reaction temperatures are 120-125 DEG C, and PO sections of polymeric reaction temperatures are 110-120 DEG C；
EO sections and PO sections of reaction pressure 0.4MPa；
Polyalcohol initiator is propylene glycol, glycerine（Glycerine）, pentaerythrite, xylitol, sorbierite, one in mannitol Kind；
The acid of neutralization is 85% phosphoric acid after reaction；
Adsorbent is aluminum magnesium silicate.
Drilling fluid polyether polyol shale control agent preparation process, it is characterised in that carry out as follows：
(1) preparation of catalyst liquid
The polyalcohol initiator of 100~400 parts by weight is added in stainless steel cauldron, 10~20 parts by weight are added KOH is warming up to 100 DEG C under stiring, and vacuum dehydration, vacuum degree control stops in 5mmHg absolute pressures when dehydration reaches 0.3%, Catalyst liquid is made.
(2) addition reaction
Stainless steel cauldron is replaced with nitrogen to oxygen content 100ppm, 100 DEG C are warming up under stirring, starts to throw EO, instead Answer heat removed by chuck cooling water, reaction temperature keep 120-125 DEG C, reaction pressure 0.4MPa, then by PO put into reaction kettle into Row internal pressure is reacted, and the molar ratio of input EO and PO is 1：2~2：1, reaction temperature is maintained at 110-120 DEG C, reaction pressure 0.4MPa, reaction time 1hr, moves into refining step later.
(3) it refines
Be added at 90 DEG C during pure water and phosphoric acid carry out and, after adsorbent stirring lhr is added, vacuum dehydration, vacuum degree control System is filtered after dehydration is qualified in 5mmHg absolute pressures, obtains water white transparency free flowing liquid, polyether polyol shale is made Inhibitor.
Compared with existing similar product, the technique effect that product of the present invention is reached is as follows：
(1) the shale-control agent for drilling fluid polyether polyol invented has the following performance advantage：1. cloud point is controllable, fit Answer different well temperature demands；2. good shale inhibition energy and greasy property under the conditions of 3% dosage, can meet 93 DEG C of rock core lines Property expansion reduced rate >=50%；3. not blistering, not increasing stick, does not influence drilling fluid rheology performance；4. low toxicity, easily biological-degradable, symbol Close green technology requirement.
(2) the shale-control agent for drilling fluid polyether polyol invented is suitable for various fresh water, seawater, salt aqueous polymer brill Well liquid system can solve the wellbore aquation undergauge occurred during oil gas well drilling, cave-in, chip off-falling, high mill resistance and turn round Square prevents the generation of bit balling, the down-hole accidents such as unsmooth, bit freezing that make a trip, and improves rate of penetration.
(3) the shale-control agent for drilling fluid polyether polyol invented is cost-effective, is suitable for the marine and various oil in land Gas well drilling project demand, particularly suitable for deep-well, extended reach well, horizontal well and the probing on water sensitivity mud page stratum.
Specific implementation mode：
Embodiment 1：
(1) preparation of catalyst liquid：200 parts of glycerine are put into stainless steel autoclave and 15 parts of KOH, stirring are warming up to 100 DEG C, dehydration is vacuumized, vacuum degree control stops vacuum when dehydration reaches 0.3%, stop heating, stop stirring in 750mmHg, system Obtain catalyst liquid.
(2) addition reaction：The stainless steel kettle of above-mentioned obtained reaction solution is replaced with nitrogen to oxygen content 100ppm, under stirring 100 DEG C are warming up to, starts to put into EO.It is increased with the input temperature of EO, while gradually giving a certain amount of cooling water, make reaction temperature Degree is kept for 120-125 DEG C, and EO input amounts are 528 parts.EO same temperature progress internal pressure reaction lhr after finishing, make reactor pressure After being down to normal pressure, then PO is thrown, reaction temperature is maintained at 110-120 DEG C, and PO input amounts are 1624 parts.It is anti-that PO carries out internal pressure after finishing It answers, after so that reactor pressure is down to normal pressure, by reaction mass temperature drop to 90 DEG C.
(3) it refines：It will drop to 90 DEG C of reaction masses to be refined, after 5% pure water is first added to reactant, be added 85% 30 parts of phosphoric acid (is calculated) by KOH equivalents, and the aluminum magnesium silicate for being added 0.1% makees adsorbent, and after stirring lhr at 95 DEG C, vacuum is de- Water, vacuum degree control in 750mmHg hereinafter, stopping dehydration when water content reaches within 0.1%, use poly- by filtering, obtained drilling fluid Ethoxylated polyhydric alcohol.
Embodiment 2-4：
By the synthesis technology drilling fluid polyether polyol of embodiment 1, but EO and PO additions change, addition data It is listed in table 1.
1 embodiment 2-4 of table respectively reacts the addition of composition
The feature performance benefit and technique effect of the shale-control agent for drilling fluid of the present invention show examination from following test result Test the cloud point for testing embodiment one, two, three, four, shale inhibition energy, greasy property, to fresh water, seawater, salt aqueous polymer The rheological property of drilling fluid influences.
One cloud point test
50mL distilled water is added in 100mL beakers, 0.50g samples are added, thermometer is put by stirring at low speed 10min In above-mentioned solution, beaker is placed in heating mantle and is heated, when solution is by clear unexpected feculence, reads temperature reading, it is as turbid Point.The cloud point of each embodiment sample is shown in Table 2.
2 shale-control agent for drilling fluid polyether polyol cloud point of table
Two shale inhibition energy
The drilling fluid experiment sodium bentonite 10.00g dried at 105 DEG C ± 3 DEG C is weighed, people's HTP-2A type shale expansions are filled In instrument test barrel, 12.0MPa pressure is added on forcing press and keeps 5min, experiment rock core is made.The test barrel equipped with rock core On shale expansion instrument, people's test sample is noted, is heated to 93 DEG C, pressure is adjusted to 0.7MPa, and it is more to measure 3% dosage polyethers First alcohol solution is used in combination distilled water to be contrast experiment in 93 DEG C, the linear expansion amount of 8h, calculates 8h linear expansion amount reduced rates. The rock core linear expansion amount of each embodiment sample is shown in Table 3.
The rock core linear expansion amount of 393 DEG C of polyether polyols alcohol solutions of table
3 experimental data of table can be seen that the polyalcohol of 3% dosage reaches 93 DEG C of high temperature linear expansion reduced rates of sodium bentonite To 50% or more, there is good shale inhibition energy.
Three lubricating coefficient reduced rates measure
In 350mL distilled water, 3% polyether polyol is added, stirring at low speed 10min measures 3% using EP extreme boundary lubrication instrument Lubricating coefficient reduced rate of the polyether polyol to distilled water solution.The lubricating coefficient reduced rate experimental result of each embodiment sample is shown in Table 4。
Lubricating coefficient reduced rate of 4 polyether polyol of table to distilled water solution
Above-mentioned analysis of experimental results show lubricating coefficient reduced rate of 3% polyether polyol in distilled water reach 60% with On, there is good greasy property.
Four influence polymer drilling fluid rheological property
Fresh water, seawater, brine polymer drilling fluid, shadow of the test polyether polyol to drilling fluid rheology performance are prepared respectively It rings, drilling fluid composition：Water（Fresh water, seawater, brine）+0.20%NaOH+0.15%Na2CO3+ 5.0% sodium bentonite+0.20% XC+0.10%PHPA+0.20%PAC-LV+1.0% starch+5.0%KCL+10%Ca2CO3（800 mesh）.By taking 1 sample of embodiment as an example, Influence of 3% polyether polyol to drilling fluid rheology performance and dehydration is added in test, and test result is shown in Table 5.
Influence of 5 polyether polyol of table to drilling fluid rheology performance
Note：After rheology testing is 105 DEG C of heat rolling 16h of drilling fluid, laboratory room temperature measures.
The experimental results showed that：Polyether polyol has in fresh water, seawater, salt-water drilling fluid with various polymer treatment agent There is good compatibility, after 105 DEG C of heat rollings of drilling fluid, base slurry is without there is flocculation, thickening, foamed phenomenon, to drilling fluid rheology Performance and dehydration do not influence.

Claims (3)

1. a kind of polyether polyol shale control agent, it is characterised in that：Its molecular structure is formula (1)；
Wherein R=C1-6Polyhydroxyalkanes, m&n=1,2 ... 20；M+n >=4, molecular weight is between 500~2000；
The preparation method of the polyether polyol shale control agent carries out as follows：
(1) preparation of catalyst liquid
The polyalcohol initiator of 100~400 parts by weight is added in stainless steel cauldron, the KOH of 10~20 parts by weight is added, It is warming up to 100 DEG C under stiring, vacuum dehydration, vacuum degree control stops in 5mmHg absolute pressures when dehydration reaches 0.3%, is made Catalyst liquid；
(2) addition reaction
Stainless steel cauldron is replaced with nitrogen to oxygen content 100ppm, 100 DEG C are warming up under stirring, starts to throw EO, reaction heat It is removed by chuck cooling water, reaction temperature is kept for 120-125 DEG C, reaction pressure 0.4MPa, then will be in PO input reaction kettle progress EO the and PO molar ratios of pressure reaction, input are 1：2~2：1, reaction temperature is maintained at 110-120 DEG C, reaction pressure 0.4MPa, instead 1hr between seasonable, moves into refining step later；
(3) it refines
And, after adsorbent stirring lhr is added, vacuum dehydration, vacuum degree control exists during addition pure water and phosphoric acid carry out at 90 DEG C 5mmHg absolute pressures are filtered after dehydration is qualified, obtain water white transparency free flowing liquid, and polyether polyol shale is made and inhibits Agent.
2. polyether polyol shale control agent according to claim 1, it is characterised in that：Polyalcohol initiator is the third two One kind in alcohol, glycerine, pentaerythrite, xylitol, sorbierite, mannitol, the acid of neutralization is 85% phosphoric acid after reaction, is inhaled Attached dose is aluminum magnesium silicate.
3. a kind of application of polyether polyol shale control agent described in claim 1, it is characterised in that：It is used as drilling fluid shale Inhibitor inhibits hydration and expansion of clay, stabilizing borehole to improve drilling fluid lubricating performance, prevent bit balling.
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CN110963739B (en) * 2018-09-29 2022-02-08 镇江苏博特新材料有限公司 Aqueous concrete hydration temperature rise inhibitor and preparation method thereof
CN109135693A (en) * 2018-10-17 2019-01-04 北京培康佳业技术发展有限公司 A kind of lubricant and its application in oil and gas field drilling fluid
CN111454699A (en) * 2020-04-30 2020-07-28 扬州润达油田化学剂有限公司 Preparation method of polyalcohol anti-sloughing inhibitor for environment-friendly drilling fluid salt slurry system
CN112778986A (en) * 2021-01-26 2021-05-11 西安通源正合石油工程有限公司 Low-permeability shale stable drilling fluid and preparation method thereof

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