CN104140789A - High temperature resistant fluid loss additive for oil-based drilling fluid and preparation method thereof - Google Patents
High temperature resistant fluid loss additive for oil-based drilling fluid and preparation method thereof Download PDFInfo
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Abstract
The invention relates to an oil-based drilling fluid used for the petroleum drilling field, and further relates to a high temperature resistant fluid loss additive for oil-based drilling fluid and a preparation method thereof. The fluid loss additive is prepared from raw materials including humic acid resin, low boiling point alcohol and organic amine. The fluid loss additive has good filtrate loss reduction effects in diesel based, mineral oil based and synthetic base drilling fluid systems, can resist temperature up to 200DEG C, and has the advantages of good temperature resistance, coincidence with environmental protection requirements and the like. Through a reasonably designed reaction route, the preparation method can complete preparation under a mild condition of 70-120DEG C. The method has the effects of mild reaction conditions and easy realization, low energy consumption, low production equipment requirements, small organic amine material loss, good comprehensive economic benefits and the like, and is suitable for popularization and application.
Description
Technical field
The present invention relates to the oil base drilling fluid that a kind of field of oil drilling is used, say further, relate to a kind of oil base drilling fluid heat resisting fluid loss reducing agent and preparation method thereof.
Background technology
Oil base drilling fluid has strong inhibition capability, oilness excellence, is beneficial to the many merits such as wellbore stability and reservoir protection, is the effective means of drilling well field reply bad ground, is used widely.Compared with water-base drilling fluid, oil base drilling fluid uses the external phase of oil phase as system, and therefore its cost is relatively high, and in oil base drilling fluid drilling process, its filtrate is oil phase, and therefore oil base drilling fluid is had relatively high expectations to the control of leak-off.At present, fluid loss agent for oil base drilling fluid mainly comprises asphalt product and modified humic acid series products, its medium pitch class fluid loss agent has and falls preferably filtration effect under middle low temperature, but under hot conditions (>=150 DEG C), pitch easily occurs softening, cause falling filtration effect and decline, cause the significantly rising of oil base drilling fluid system plastic viscosity simultaneously, reduce rate of penetration; Moreover pitch easily causes environmental pollution, therefore the use range of such fluid loss agent is subject to increasing restriction.
Modified humic acid class fluid loss agent makes it by the hydrophilic oleophylic that changes into by humic-acid kind raw material through chemical modification, for oil base drilling fluid as fluid loss agent.For example, the U.S. reacts with polyalkylene polyamine with humic acids, humic acids pyrolysis copolymerization under pressure with long-chain fat amine or substituted aniline for Britain, domestic with humic acids with organic amine amidation under the high temperature heat-flash of 160 DEG C～200 DEG C.
For example CN101624516A discloses a kind of oil base drilling fluid fluid loss agent and compound method thereof, its main preparation methods is, Humic Acid Resin and organic amine are put into encloses container, with after nitrogen flooding oxygen, heating container to 180～200 DEG C, maintain 8～10 hours reaction times, after having reacted, are cooled to room temperature, then product was pulverized to 60 mesh sieves, obtained fluid loss additive of oil-base drilling fluid product.Described raw material, preparation technology are different from the present invention, do not comprise transesterification reaction; And its reaction conditions requirement is harsher, need react under 180～200 DEG C of hot conditionss, and need reaction vessel enclosed high pressure, equipment requirements is high, moreover the reaction times is longer, is 8～10 hours.
Above-mentioned preparation method's ubiquity temperature of reaction is high, energy consumption is large, reaction vessel requires high, long reaction time, and in reaction process, organic amine is volatile causes the shortcoming and defect such as wastage of material, productive rate are low.
Summary of the invention
For solving the above-mentioned problems in the prior art, the present invention is devoted to provide a kind of oil base drilling fluid that can obtain under mild reaction conditions heat resisting fluid loss reducing agent and preparation method thereof.
One of the object of the invention is to provide a kind of oil base drilling fluid heat resisting fluid loss reducing agent, obtained by following reaction preparation by the raw material including Humic Acid Resin, low-boiling point alcohol and organic amine: carry out esterification by Humic Acid Resin and low-boiling point alcohol, its gained intermediate product carries out amidate action with organic amine again and obtains described oil base drilling fluid heat resisting fluid loss reducing agent.
Wherein, in the esterification of Humic Acid Resin and low-boiling point alcohol, taking Humic Acid Resin as 100 parts by weight, low-boiling point alcohol is 100～1000 parts, is preferably 400～600 parts; In the amidate action of described intermediate product and organic amine, taking intermediate product as 100 parts by weight, organic amine is 30～40 parts, is preferably 34～36 parts.
The above Humic Acid Resin can be selected published various Humic Acid Resins in prior art, also can be with reference to disclosed Humic Acid Resin in CN101624516A.
Particularly, described Humic Acid Resin can be prepared from by the preparation method who comprises the following steps:
1) in 600 weight parts waters, first add 200～300 parts of humates, stir it is dissolved completely.
2) add 20～60 parts, preferably 30～40 protonic acids, at room temperature stirring reaction; To react after product and filter, clean; The time of reaction can stop with sufficient reacting, is not particularly limited, and generally can be 1～2.5 hour.
3) product after washing is dried, pulverized.Oven dry can be carried out at 80～120 DEG C, and general drying time can be 4～10 hours.
Described humate is at least one in potassium humate, Sodium salts humic acids preferably;
Described protonic acid is at least one in hydrochloric acid, sulfuric acid, nitric acid and phosphoric acid preferably.
The above lower boiling alcohols is volatile small molecular alcohol, and its boiling point is preferably at 60～90 DEG C; More preferably at least one in methyl alcohol, ethanol, propyl alcohol and Virahol.
The above organic amine can be selected from least one in the material that following three kinds of general formulas represent:
(1) R
1-NH
2, wherein R
1be selected from carbon atom number in 6～30 saturated carbon chains, unsaturated carbon chains, cycloalkyl or the aryl of (preferably 8～16, more preferably 10～12);
(2) R
1-HN-R
2, wherein R
1be selected from carbon atom number in 6～30 scopes saturated carbon chains, unsaturated carbon chains, cycloalkyl or the aryl of (preferably 8～16, more preferably 10～12); R
2be selected from carbon atom number in 1～30 scope saturated carbon chains, unsaturated carbon chains, cycloalkyl or the aryl of (preferably 1～8, more preferably 1～4);
(3) H
2n-R
1-(NH-C
nh2
n)
m-NH
2, wherein R
1be selected from carbon atom number in 1～20 scope saturated carbon chains, unsaturated carbon chains, cycloalkyl or the aryl of (preferably 2～12); N is 1～6, preferably 2～4; M is 0～20, preferably 0～8.
Preferably at least one in following material:
Normal hexyl Amine, n-octyl amine, positive two cetylamines, 12-amido laurylene, hexahydroaniline, to monomethylaniline, to hexadecyl aniline, n-hexyl methylamine, two-n-octyl amine, two-dodecyl amine, 1-laurylene ylmethyl amine, cyclohexylethylamine, ethylphenyl amine, methanediamine, quadrol, 1,3-propylene diamine, 1,6-hexanediamine, 1,4-cyclohexanediamine, 1,18-octadecyl diamines, 1,30-triacontyl diamines, diethylenetriamine, triethylene tetramine, tetraethylene pentamine, five ethene hexamines.。
Two of the object of the invention is to provide the preparation method of a kind of oil base drilling fluid heat resisting fluid loss reducing agent, specifically, can comprise following reactions steps:
The first step: get 100 weight part Humic Acid Resins, add 100～1000 parts of low-boiling point alcohols, 5～30 parts of esterification catalyzer, in inert gas environment, be heated to solution boiling, under reflux state, carry out esterification, then dry, pulverize, obtain intermediate product; Wherein, preferably 400～600 parts of low-boiling point alcohols, preferably 12～18 parts of catalyzer.
This reaction is preferably carried out under return stirring condition, and the reaction times is not particularly limited, and to sufficient reacting, generally can be 5～8 hours; Described bake out temperature and time are also not particularly limited, and make intermediate product fully dry, generally at 80～120 DEG C, dry 4～10 hours.
Second step: get 100 parts of described intermediate products, add 30～40 parts of organic amines, 5～20 parts of transesterification catalysts to mix, in inert gas environment, 70～120 DEG C, preferably carry out amidate action at 80～100 DEG C, constantly isolate by product low-boiling point alcohol, obtain object product simultaneously; Wherein, preferably 34～36 parts of organic amines, preferably 12～16 parts of transesterification catalysts.
This reaction is preferably carried out under agitation condition, and reaction, to fully, generally can be 5～8 hours.
Rare gas element described in above preparation method can be selected from disclosed various rare gas elementes in prior art, at least one in preferred nitrogen, helium and argon gas.
Described in above preparation method's the first step, esterification can be selected from catalyst for esterification reaction conventional in prior art with catalyzer, preferably at least one in acid catalyst or ester class catalyzer,
Wherein, optional at least one in sulfuric acid, phosphoric acid and nitric acid of described acid catalyst, described ester class catalyzer can be selected from least one in methyl-formiate, ethyl formate, propyl formate, isopropyl formate, methyl acetate, ethyl acetate, propyl acetate and isopropyl acetate;
Transesterification catalyst described in second step can be selected from transesterification catalyst conventional in prior art, preferably at least one in alkali catalyst or metal species catalyzer; Wherein, described alkali catalyst is selected from least one in lithium hydroxide, potassium hydroxide, sodium hydroxide, calcium hydroxide and calcium oxide;
Described metal catalyst is selected from least one in organotin transesterification catalyst, organic zinc transesterification catalyst, lithium methoxide, lithium ethoxide, lithium propoxide, isopropyl lithium alkoxide, sodium methylate, sodium ethylate, sodium propylate, sodium isopropylate, potassium methylate, potassium ethylate, potassium propylate, potassium isopropoxide, calcium methylate, calcium ethylate, calcium propylate, calcium isopropoxide.
Oil base drilling fluid provided by the invention can be applicable to the conventional oil phase drilling fluid in this area with heat resisting fluid loss reducing agent, as diesel oil based, mineral oil based and synthetic base drilling fluid (common name of drilling well industry), and under the environment for use up to 200 DEG C, all there is a good control filtration effect, when under 200 DEG C of conditions, heat resisting fluid loss reducing agent dosage is 2～5%, the API filtration of above-mentioned oil base drilling fluid is less than 10mL.
Oil base drilling fluid of the present invention passes through reaction scheme reasonable in design by the preparation method of heat resisting fluid loss reducing agent, can be at 70～120 DEG C, preferably, under the mild reaction conditions of 80～100 DEG C, adopt the fluid loss additive of oil-base drilling fluid of the synthetic high temperature resistance of Humic Acid Resin, small molecular alcohol and organic amine.The method has the advantages such as reaction conditions is gentle easily to be implemented, and organic amine significant loss is few, and overall economic efficiency is good; And the fluid loss additive of oil-base drilling fluid prepared of the method to have temperature resistance good, meet the outstanding advantages such as environmental requirement.
Generally speaking, the present invention has following effect:
(1) fluid loss agent of the present invention can be applicable to diesel oil based, mineral oil based and synthetic base drilling fluid.
(2) fluid loss agent of the present invention all has good control filtration effect at 200 DEG C.
(3) bio-toxicity of the present invention is low, is beneficial to environment protection.
(4) preparation method's reaction conditions of fluid loss agent of the present invention is gentle easily realizes, and energy consumption is low, production unit requirement is low, and organic amine significant loss is few, and overall economic efficiency is good.
Embodiment
Below in conjunction with specific embodiment, the present invention will be further described.But the present invention is not limited in following embodiment.
The chemical reagent using in the present embodiment is conventional commercially available prod, this area.
Preparation Example
1. the preparation of Humic Acid Resin
(1) in the beaker of 1 liter, pour 600 milliliters of (600g) distilled water into, first add 250 grams of potassium humates to stir completely and dissolve, then add 20 milliliters of phosphoric acid, at room temperature stirring reaction 2 hours, will react after product and filter, and wash with water 3 times.Product after washing is dried 6 hours at 90 DEG C, and moisture content is less than 5%.To dry after product pulverizing, cross 60 mesh sieves, obtain Humic Acid Resin for subsequent use 1.
(2) in the beaker of 1 liter, pour 600 milliliters of (600g) distilled water into, first add 200 grams of Sodium salts humic acidss to stir completely and dissolve, then add 60 milliliters of nitric acid, at room temperature stirring reaction 1.5 hours, will react after product and filter, and wash with water 3 times.Product after washing is dried 5 hours at 100 DEG C, and moisture content is less than 5%.To dry after product pulverizing, cross 60 mesh sieves, obtain Humic Acid Resin for subsequent use 2.
2. the preparation of heat resisting fluid loss reducing agent product for oil base drilling fluid
Embodiment 1
The first step
Get 100 grams of Humic Acid Resins 1, add 125 milliliters of (100.0g) methyl alcohol, add esterification 3 milliliters of (2.7g) methyl acetates of catalyzer and 2 milliliters of (3.68g) sulfuric acid, stirring reaction 8 hours in nitrogen environment, under reflux state, then at 90 DEG C, dry 5 hours, after pulverizing, cross 60 mesh sieves, obtain intermediate product.
Second step
Get 100 grams of above-mentioned intermediate products, add 35 grams of organic amine C
10h
21-NH
2, 5 grams of potassium hydroxide of transesterification catalyst mix, in nitrogen environment, at 75 DEG C, stirring reaction 8 hours, constantly isolates methyl alcohol simultaneously.Rear cool to room temperature, pulverized 60 mesh sieves, obtained oil base drilling fluid heat resisting fluid loss reducing agent product.
Embodiment 2
The first step
Get 100 grams of Humic Acid Resins 2, add 600 milliliters of (475g) ethanol, add esterification 12 milliliters of (10.8g) ethyl acetate of catalyzer and 5 milliliters of (8.45g) phosphoric acid, stirring reaction 5 hours in ar gas environment, under reflux state, then at 95 DEG C, dry 5 hours, after pulverizing, cross 60 mesh sieves, obtain intermediate product.
Second step
Get 100 grams of above-mentioned intermediate products, add 30 grams of organic amine C
12h
25-NH-CH
3, 10 grams of organotin transesterification catalysts mix, in ar gas environment, at 80 DEG C, stirring reaction 7 hours, constantly isolates ethanol simultaneously.Rear cool to room temperature, pulverized 60 mesh sieves, obtained oil base drilling fluid heat resisting fluid loss reducing agent product.
Embodiment 3
The first step
Get 100 grams of Humic Acid Resins 1, add 750 milliliters of (600g) Virahols, add esterification 10 milliliters of isopropyl acetates of catalyzer (8.8g) and 5 milliliters of (7.5g) nitric acid, stirring reaction 7 hours in nitrogen environment, under reflux state, then at 100 DEG C, dry 4.5 hours, after pulverizing, cross 60 mesh sieves, obtain intermediate product.
Second step
Get 100 grams of above-mentioned intermediate products, add 40 grams of H
2n-C
12h
24-NH
2, 20 grams of calcium hydroxides mix, in nitrogen environment, at 95 DEG C, stirring reaction 6.5 hours, constantly isolates Virahol simultaneously.Rear cool to room temperature, pulverized 60 mesh sieves, obtained oil base drilling fluid heat resisting fluid loss reducing agent product.
Embodiment 4
The first step
Get 100 grams of Humic Acid Resins 2, add 1000 milliliters of (790g) propyl alcohol, add esterification 10 milliliters of (9.0g) propyl acetates of catalyzer and 12 milliliters of (20.3g) phosphoric acid, stirring reaction 8 hours in nitrogen environment, under reflux state, then at 100 DEG C, dry 4.5 hours, after pulverizing, cross 60 mesh sieves, obtain intermediate product.
Second step
Get 100 grams of above-mentioned intermediate products, add 40 grams of H
2n-C
2h
4-(NH-C
2h
4)
2-NH
2, 10 grams of sodium propylates mix, in nitrogen environment, at 100 DEG C, stirring reaction 8 hours, constantly isolates propyl alcohol simultaneously.Rear cool to room temperature, pulverized 60 mesh sieves, obtained oil base drilling fluid heat resisting fluid loss reducing agent product.
Measure of merit embodiment
The making of oil base drilling fluid:
For the effect of effective evaluation high temperature resistance fluid loss additive of oil-base drilling fluid of the present invention, adopt and configure with the following method oil base drilling fluid: in jar, put into base oil for oil base drilling fluid (diesel oil, white oil or gas liquefaction), under strong stirring, add emulsifying agent and wetting agent, high-speed stirring 5～10min; Then add a certain amount of CaCl
2salt solution (CaCl
2mass concentration is 0～40%), high-speed stirring 30～40min; Then in mixed system, add successively organophilic clay, calcium oxide and oil base drilling fluid heat resisting fluid loss reducing agent of the present invention, every kind of material adds rear strong stirring 20min, then add barite to desired density, strong stirring 30min again after material therefor adds, then measures ES, AV, PV, YP, the FFL of oil base drilling fluid with reference to GB/T16782-1997
aPIand FL
hTHP.
Embodiment 5
White oil drilling fluid system base slurry formula:
100 parts of 3# white oils, 33 parts of CaCl that mass concentration is 25%
2the aqueous solution, 5 parts of emulsifying agents (sorbester p17 and mahogany acid calcium compounds, the two weight ratio 7:3), 3 parts of CaO, 4 parts of organo montmorillonites, 1 part of wetting agent (cetyl trimethylammonium bromide), use barite increase the weight of to density be 1.20g/cm
3.200 DEG C of heat were rolled after 16 hours, and test result is in table 1.
Table 1
Embodiment 6
Diesel oil drilling fluid system base slurry formula:
100 parts of 0# diesel oil, 25 parts of CaCl that mass concentration is 20%
2the aqueous solution, 6 parts of emulsifying agents, 4 parts of CaO, 4 parts of organophilic clays, 2 parts of wetting agents, use barite increase the weight of to density be 1.50g/cm
3.200 DEG C of heat were rolled after 16 hours, and test result is in table 2.
Emulsifying agent used, organophilic clay and wetting agent are with embodiment 5.
Table 2
From table 1,2 data: utilize fluid loss agent prepared by the method for the invention in white oil and diesel oil based drilling fluid system, all have the good filtration effect that falls, temperature resistance can reach 200 DEG C.200 DEG C of heat were rolled after 16 hours, and the API filtration of oil base drilling fluid is less than 10mL.Can standby maintenance system have good rheological, reasonably ratio of dynamic shear force/yield value to plastic viscosity, is suitable for carrying out orientation well construction.
Claims (10)
1. an oil base drilling fluid heat resisting fluid loss reducing agent, obtained by following reaction preparation by the raw material including Humic Acid Resin, low-boiling point alcohol and organic amine: carry out esterification by Humic Acid Resin and low-boiling point alcohol, its gained intermediate product carries out amidate action with organic amine again and obtains described oil base drilling fluid heat resisting fluid loss reducing agent.
2. oil base drilling fluid heat resisting fluid loss reducing agent as claimed in claim 1, is characterized in that:
In the esterification of described Humic Acid Resin and low-boiling point alcohol, taking Humic Acid Resin as 100 parts by weight, low-boiling point alcohol is 100～1000 parts, is preferably 400～600 parts; In the amidate action of described intermediate product and organic amine, taking intermediate product as 100 parts by weight, organic amine is 30～40 parts, is preferably 34～36 parts.
3. oil base drilling fluid heat resisting fluid loss reducing agent as claimed in claim 1 or 2, is characterized in that described Humic Acid Resin is prepared from by the preparation method who comprises the following steps:
1) in 600 weight parts waters, first add 200～300 parts of humates, stir it is dissolved completely;
2) add 20～60 parts of protonic acids, at room temperature stirring reactions; To react after product and filter, clean;
3) product after washing is dried, pulverized.
4. oil base drilling fluid heat resisting fluid loss reducing agent as claimed in claim 3, is characterized in that:
Described humate is selected from least one in potassium humate, Sodium salts humic acids;
Described protonic acid is selected from least one in hydrochloric acid, sulfuric acid, nitric acid and phosphoric acid.
5. oil base drilling fluid heat resisting fluid loss reducing agent as claimed in claim 1 or 2, is characterized in that:
Described low-boiling point alcohol is volatile small molecular alcohol, and its boiling point is at 60～90 DEG C; Preferably include at least one in methyl alcohol, ethanol, propyl alcohol, Virahol.
6. oil base drilling fluid heat resisting fluid loss reducing agent as claimed in claim 1 or 2, is characterized in that described organic amine is selected from least one in the material that following three kinds of general formulas represent:
(1) R
1-NH
2, wherein R
1be selected from carbon atom number 6～30, preferably saturated carbon chains, unsaturated carbon chains, cycloalkyl or the aryl in 8～16 scopes;
(2) R
1-HN-R
2, wherein R
1be selected from carbon atom number 6～30, preferably saturated carbon chains, unsaturated carbon chains, cycloalkyl or the aryl in 8～16 scopes, R
2be selected from carbon atom number 1～30, preferably saturated carbon chains, unsaturated carbon chains, cycloalkyl or the aryl in 1～8 scope;
(3) H
2n-R
1-(NH-C
nh2
n)
m-NH
2, wherein R
1be selected from carbon atom number 1～20, preferably saturated carbon chains, unsaturated carbon chains, cycloalkyl or the aryl in 2～12 scopes, n is that 1～6, m is 0～20.
7. oil base drilling fluid heat resisting fluid loss reducing agent as claimed in claim 6, it is characterized in that described organic amine is selected from least one in following material: normal hexyl Amine, n-octyl amine, positive two cetylamines, 12-amido laurylene, hexahydroaniline, to monomethylaniline, to hexadecyl aniline, n-hexyl methylamine, two-n-octyl amine, two-dodecyl amine, 1-laurylene ylmethyl amine, cyclohexylethylamine, ethylphenyl amine, methanediamine, quadrol, 1, 3-propylene diamine, 1, 6-hexanediamine, 1, 4-cyclohexanediamine, 1, 18-octadecyl diamines, 1, 30-triacontyl diamines, diethylenetriamine, triethylene tetramine, tetraethylene pentamine, five ethene hexamines.
8. the preparation method of heat resisting fluid loss reducing agent for the oil base drilling fluid as described in one of claim 1～7, comprises following reactions steps:
The first step: get 100 weight part Humic Acid Resins, add 100～1000 parts, preferably the low-boiling point alcohol of 400～600 parts, add 5～30 parts, the preferably esterification catalyzer of 12～18 parts is heated to solution boiling in inert gas environment, carries out esterification under reflux state; Then dry, pulverize, obtain intermediate product;
Second step: get intermediate product described in 100 weight parts, add 30～40 parts, the preferably organic amine of 34～36 parts, add 5～20 parts, preferably the transesterification catalyst of 12～16 parts mixes, in inert gas environment, 70～120 DEG C, preferably carry out amidate action at 80～100 DEG C, constantly isolate by product low-boiling point alcohol, obtain object product simultaneously.
9. the preparation method of heat resisting fluid loss reducing agent for oil base drilling fluid as claimed in claim 8, is characterized in that:
Described rare gas element is selected from least one in nitrogen, helium and argon gas;
Esterification described in the first step is selected from least one in acid catalyst or ester class catalyzer with catalyzer,
Wherein, described acid catalyst is selected from least one in sulfuric acid, phosphoric acid and nitric acid, and described ester class catalyzer is selected from least one in methyl-formiate, ethyl formate, propyl formate, isopropyl formate, methyl acetate, ethyl acetate, propyl acetate and isopropyl acetate;
Transesterification catalyst described in second step is selected from alkali catalyst or metal species catalyzer; Wherein, described alkali catalyst is selected from least one in lithium hydroxide, potassium hydroxide, sodium hydroxide, calcium hydroxide and calcium oxide;
Described metal catalyst is selected from least one in organotin transesterification catalyst, organic zinc transesterification catalyst, lithium methoxide, lithium ethoxide, lithium propoxide, isopropyl lithium alkoxide, sodium methylate, sodium ethylate, sodium propylate, sodium isopropylate, potassium methylate, potassium ethylate, potassium propylate, potassium isopropoxide, calcium methylate, calcium ethylate, calcium propylate, calcium isopropoxide.
10. oil base drilling fluid heat resisting fluid loss reducing agent as claimed in claim 8, is characterized in that:
The reaction of the described the first step is carried out under return stirring; The reaction of described second step is under agitation carried out.
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| CN105733526A (en) * | 2016-04-19 | 2016-07-06 | 潍坊天福化学科技有限公司 | Drilling fluid filtrate reducer and preparation method thereof |
| CN106833554A (en) * | 2017-01-24 | 2017-06-13 | 福州大学 | Filtrate reducer for drilling fluid prepared by a kind of utilization percolate and preparation method thereof |
| CN106867483A (en) * | 2017-04-01 | 2017-06-20 | 新疆华油能源工程服务有限公司 | A kind of environment-friendly oil-based filtrate reducer for drilling fluid of high temperature resistance |
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| CN110982497A (en) * | 2016-11-07 | 2020-04-10 | 天津天诚拓源科技发展有限公司 | Preparation method of high-temperature-resistant filtrate reducer for oil-based drilling fluid |
| CN111139043A (en) * | 2018-11-06 | 2020-05-12 | 中国石油化工股份有限公司 | Plugging anti-collapse treating agent for shale stratum and preparation method thereof |
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| CN111139043A (en) * | 2018-11-06 | 2020-05-12 | 中国石油化工股份有限公司 | Plugging anti-collapse treating agent for shale stratum and preparation method thereof |
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| CN115403785A (en) * | 2021-05-28 | 2022-11-29 | 中石化石油工程技术服务有限公司 | Humic acid filtrate reducer and preparation method and application thereof |
| CN115403785B (en) * | 2021-05-28 | 2024-01-05 | 中石化石油工程技术服务有限公司 | Humic acid filtrate reducer and preparation method and application thereof |
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