CN108728054B - Filtrate reducer for oil-based drilling fluid and preparation method thereof - Google Patents

Filtrate reducer for oil-based drilling fluid and preparation method thereof Download PDF

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CN108728054B
CN108728054B CN201710266952.1A CN201710266952A CN108728054B CN 108728054 B CN108728054 B CN 108728054B CN 201710266952 A CN201710266952 A CN 201710266952A CN 108728054 B CN108728054 B CN 108728054B
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based drilling
drilling fluid
filtrate reducer
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CN108728054A (en
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封心领
袁俊秀
靳志超
逯贵广
庞雨微
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China Petroleum and Chemical Corp
Research Institute of Sinopec Nanjing Chemical Industry Co Ltd
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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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B15/00—Preparation of other cellulose derivatives or modified cellulose, e.g. complexes
    • C08B15/05—Derivatives containing elements other than carbon, hydrogen, oxygen, halogens or sulfur
    • C08B15/06—Derivatives containing elements other than carbon, hydrogen, oxygen, halogens or sulfur containing nitrogen, e.g. carbamates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B3/00—Preparation of cellulose esters of organic acids
    • C08B3/14—Preparation of cellulose esters of organic acids in which the organic acid residue contains substituents, e.g. NH2, Cl
    • 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
    • C09K8/32—Non-aqueous well-drilling compositions, e.g. oil-based
    • 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

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  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Health & Medical Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
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Abstract

Under the protection of nitrogen, sequentially adding NaOH solution, organic solvent and refined cotton into a reaction kettle, alkalizing for 1-2h at the temperature of 20-25 ℃, adding chloroacetic acid, heating to 50-80 ℃, reacting for 1-2h, adjusting the pH value to 4-6 by glacial acetic acid, adding organic amine, heating to 140-180 ℃, reacting for 1-2h, and discharging to obtain the oil-based drilling fluid filtrate reducer. The oil-based fluid loss additive provided by the invention can be suitable for diesel oil, white oil and synthetic base drilling fluid systems, the product is environment-friendly, the fluid loss reducing effect is obvious, the preparation method and the required equipment conditions are simple, and the implementation is easy.

Description

Filtrate reducer for oil-based drilling fluid and preparation method thereof
Technical Field
The invention relates to a fluid loss additive for an oil-based drilling fluid and a preparation method thereof.
Background
In recent years, with the increasing energy demand at home and abroad, oil exploration and development are gradually drilling towards deep parts and complex stratums, the number of complex wells such as deep wells, ultra-deep wells, highly deviated wells, multilateral wells, horizontal wells and the like is increasing, and in addition, the demand of oil-based drilling fluids for the development of unconventional oil and gas resources is gradually increasing. The fluid loss additive is an indispensable component in the drilling fluid treating agent, mainly has the main function of enabling the drilling fluid to form thin and compact mud cakes on a well wall, thereby playing the roles of reducing the fluid loss, improving the quality of the mud cakes and the like, and is an important chemical treating agent for maintaining the performance of the drilling fluid, improving the rheological property of the drilling fluid, reducing the fluid loss of harmful liquid to a stratum, stabilizing the well wall and ensuring the well diameter regulation and an oil-gas layer. It plays an important role in safe and efficient drilling and preventing drilling accidents. The development of the fluid loss additive for the oil-based drilling fluid in China is less, the fluid loss additive is mainly asphalt and organic amine modified humic acid fluid loss additive, wherein asphalt products have the defects of environmental pollution, large dosage and influence on drilling speed, and the fluid loss additive is limited to be used in the formula of the currently common oil-based drilling fluid; the organic amine modified humic acid fluid loss additive has the defect of poor dispersion in oil-based drilling fluid, particularly in low-toxicity environment-friendly base oil, the dispersion is poorer, and the fluid loss effect is different from that of asphalt products.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the oil-based drilling fluid filtrate reducer which has no environmental pollution, good dispersion performance in oil-based drilling fluid and excellent fluid loss reducing effect, and the preparation method thereof.
The purpose of the invention is realized by the following technical scheme: the fluid loss additive for the oil-based drilling fluid is characterized by comprising the following components in parts by weight: refined cotton: 50 parts, organic solvent: 400-500 parts; NaOH solution: 100-120 parts; chloroacetic acid: 100-137 parts; organic amine: 100 and 200 portions.
Generally, the concentration of the NaOH solution is as follows by mass percent: 45 to 50 percent.
The organic solvent is one or a mixture of more of isopropanol, toluene, ethanol and acetone.
The organic amine is C14-C18One or more of alkyl primary amine and secondary amine are mixed.
The preparation method of the fluid loss additive for the oil-based drilling fluid is characterized by comprising the following steps of: under the protection of nitrogen, sequentially adding NaOH solution, organic solvent and refined cotton into a reaction kettle, alkalizing for 1-2h at 20-25 ℃, adding chloroacetic acid, heating to 50-80 ℃, reacting for 1-2h, adjusting the pH value to 4-6 by adopting glacial acetic acid, adding organic amine, heating to 140-180 ℃, reacting for 1-2h, and performing filter pressing and discharging to obtain the oil-based drilling fluid filtrate reducer.
The preferable preparation method comprises the following steps: under the protection of nitrogen, sequentially adding NaOH solution, an organic solvent and refined cotton into a reaction kettle, alkalizing for 1.5h at 20-25 ℃, adding chloroacetic acid, heating to 50 ℃, reacting for 1-2h, adjusting the pH value to 4-6 by using glacial acetic acid, adding organic amine, heating to 180 ℃, reacting for 2h, and performing filter pressing and discharging to obtain the oil-based drilling fluid filtrate reducer.
The invention has the following advantages:
the oil-based filtrate reducer has the advantages of easily obtained raw materials and simple preparation process; the filtrate reducer is a cellulose derivative, and is environment-friendly; the filtrate reducer is easy to disperse in oil-based drilling fluid and has good compatibility with other drilling fluid treating agents.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the content of the present invention, but the content of the present invention is not limited to the following examples.
Example 1
Under the protection of nitrogen, sequentially adding 120 parts of 45% NaOH solution, 500 parts of isopropanol and 50 parts of refined cotton into a reaction kettle, fully stirring, alkalizing for 1h at 20 ℃, adding 100 parts of chloroacetic acid, heating to 50 ℃, reacting for 1h, adjusting the pH value to 4-6 by using glacial acetic acid, adding 100 parts of octadecylamine, heating to 140 ℃, reacting for 1h, and performing filter pressing and discharging to obtain the oil-based drilling fluid filtrate reducer.
Example 2
Under the protection of nitrogen, 100 parts of NaOH solution with the concentration of 47%, 400 parts of isopropanol and 50 parts of refined cotton are sequentially added into a reaction kettle and fully stirred, alkalized for 1h at 20 ℃, added with 137 parts of chloroacetic acid, heated to 50 ℃ for reaction for 1h, adjusted to the pH value of 4-6 by glacial acetic acid, added with 200 parts of tetradecyl primary amine, heated to 140 ℃ for reaction for 1h, and subjected to filter pressing and discharging to obtain the oil-based drilling fluid filtrate reducer.
Example 3
Under the protection of nitrogen, 100 parts of NaOH solution with the concentration of 46%, 400 parts of toluene and 50 parts of refined cotton are sequentially added into a reaction kettle and fully stirred, alkalized for 1.5 hours at the temperature of 20 ℃, added with 120 parts of chloroacetic acid, heated to 50 ℃ for reaction for 2 hours, then the pH value is adjusted to 4-6 by glacial acetic acid, added with 150 parts of hexadecyl primary amine, heated to 150 ℃ for reaction for 2 hours, and then the oil-based drilling fluid filtrate reducer is obtained by pressure filtration and discharging.
Example 4
Under the protection of nitrogen, sequentially adding 120 parts of 50% NaOH solution and 500 parts of ethanol into a reaction kettle, fully stirring 50 parts of refined cotton, alkalizing for 2 hours at 20 ℃, adding 137 parts of chloroacetic acid, heating to 70 ℃, reacting for 2 hours, adjusting the pH value to 4-6 by using glacial acetic acid, adding 150 parts of octadecylamine, heating to 180 ℃, reacting for 2 hours, and performing filter pressing and discharging to obtain the oil-based drilling fluid filtrate reducer.
Example 5
Under the protection of nitrogen, sequentially adding 100 parts of 45% NaOH solution, 400 parts of ethanol and 50 parts of refined cotton into a reaction kettle, fully stirring, alkalizing for 1h at 20 ℃, adding 100 parts of chloroacetic acid, heating to 50 ℃, reacting for 1h, adjusting the pH value to 4-6 by using glacial acetic acid, adding 100 parts of heptadecyl primary amine, heating to 140 ℃, reacting for 1h, and performing filter pressing and discharging to obtain the oil-based drilling fluid filtrate reducer.
Example 6
Under the protection of nitrogen, sequentially adding 120 parts of 48% NaOH solution, 500 parts of acetone and 50 parts of refined cotton into a reaction kettle, fully stirring, alkalizing for 2 hours at 20 ℃, adding 137 parts of chloroacetic acid, heating to 80 ℃, reacting for 2 hours, adjusting the pH value to 4-6 by using glacial acetic acid, adding 200 parts of octadecylamine, heating to 180 ℃, reacting for 2 hours, and performing filter pressing and discharging to obtain the oil-based drilling fluid filtrate reducer.
Example 7
Under the protection of nitrogen, sequentially adding 110 parts of NaOH solution with the concentration of 50%, 450 parts of isopropanol and 50 parts of refined cotton into a reaction kettle, fully stirring, alkalizing for 1.5h at 20 ℃, adding 117 parts of chloroacetic acid, heating to 75 ℃ for reaction for 1.5h, adjusting the pH value to 4-6 by using glacial acetic acid, adding 150 parts of tetradecyl primary amine, heating to 170 ℃ for reaction for 1.5h, and performing pressure filtration and discharging to obtain the oil-based drilling fluid filtrate reducer.
Example 8
Under the protection of nitrogen, sequentially adding 110 parts of NaOH solution with the concentration of 47%, 460 parts of toluene and 50 parts of refined cotton into a reaction kettle, fully stirring, alkalizing for 1.5h at 20 ℃, adding 120 parts of chloroacetic acid, heating to 60 ℃, reacting for 2h, adjusting the pH value to 4-6 by using glacial acetic acid, adding 160 parts of hexadecyl primary amine, heating to 160 ℃, reacting for 2h, and performing filter pressing and discharging to obtain the oil-based drilling fluid filtrate reducer.
Example 9
Under the protection of nitrogen, 115 parts of 45% NaOH solution and 450 parts of ethanol are sequentially added into a reaction kettle, 50 parts of refined cotton are fully stirred, the mixture is alkalized for 1 hour at 20 ℃, 100 parts of chloroacetic acid is added, the temperature is increased to 50 ℃ for reaction for 1 hour, glacial acetic acid is adopted to adjust the pH value to 4-6, 100 parts of heptadecyl primary amine is added, the temperature is increased to 140 ℃ for reaction for 1 hour, and the oil-based drilling fluid filtrate reducer is obtained through pressure filtration and discharging.
Example 10
Under the protection of nitrogen, 117 parts of 45% NaOH solution, 500 parts of ethanol and 50 parts of refined cotton are sequentially added into a reaction kettle and fully stirred, alkalized for 1h at 23 ℃, added with 120 parts of chloroacetic acid, heated to 73 ℃ for reaction for 1h, adjusted to pH 4-6 by glacial acetic acid, added with 100 parts of heptadecyl primary amine, heated to 140 ℃ for reaction for 1h, and subjected to filter pressing and discharging to obtain the oil-based drilling fluid filtrate reducer.
Evaluation of Performance
The samples of examples 1-10 were evaluated for performance.
The diesel oil-based drilling fluid comprises the following components in parts by weight: 240mL of diesel oil, 6g of organic soil and 60mL of 20% CaCl2Solution +12g of main emulsifier +4g of auxiliary emulsifier +12g of filtrate reducer.
The formula of the white oil-based drilling fluid comprises the following components: 240mL5# white oil +6g organic soil +60mL 20% CaCl2Solution +12g of main emulsifier +4g of auxiliary emulsifier +12g of filtrate reducer.
The formula of the synthetic base drilling fluid comprises the following components: 240mL of LAO +6g of organic soil +60mL of 20% CaCl2Solution +12g of main emulsifier +4g of auxiliary emulsifier +12g of filtrate reducer.
The performance of the filtrate reducer in the three drilling fluids is respectively tested, and the test results are as follows.
Table 1 test results in diesel based drilling fluids
Figure DEST_PATH_IMAGE002
Table 2 test results in white oil based drilling fluids
Figure DEST_PATH_IMAGE004
Table 3 test results in synthetic based drilling fluids
Figure DEST_PATH_IMAGE006
As can be seen from the data in tables 1, 2 and 3: the API (American Petroleum base) filtration loss and the high-temperature high-pressure filtration loss of the diesel oil-based drilling fluid, the white oil-based drilling fluid and the synthetic-based drilling fluid are much smaller than those of the drilling fluid without the filtration loss additive after the filtration loss additive is added, and the filtration loss reducing effect of the filtration loss additive in the oil-based drilling fluid is obvious.

Claims (4)

1. The fluid loss additive for the oil-based drilling fluid is characterized by comprising the following components in parts by weight: alpha cellulose > 96% refined cotton: 50 parts, organic solvent: 400-500 parts; NaOH solution: 100-120 parts; chloroacetic acid: 100-137 parts; organic amine: 100-200 parts; the organic amine is C14-C18One or more of alkyl primary amine and secondary amine are mixed;
the preparation method of the fluid loss additive for the oil-based drilling fluid comprises the following steps: under the protection of nitrogen, sequentially adding NaOH solution, organic solvent and refined cotton into a reaction kettle, alkalizing for 1-2h at 20-25 ℃, adding chloroacetic acid, heating to 50-80 ℃, reacting for 1-2h, adjusting the pH value to 4-6 by adopting glacial acetic acid, adding organic amine, heating to 140-180 ℃, reacting for 1-2h, and performing filter pressing and discharging to obtain the oil-based drilling fluid filtrate reducer.
2. The fluid loss additive for oil-based drilling fluids according to claim 1, wherein the concentration of the NaOH solution is 45 to 50% by mass.
3. The fluid loss additive for oil-based drilling fluids according to claim 1, wherein the organic solvent is one or a mixture of isopropanol, toluene, ethanol and acetone.
4. The oil-based drilling fluid filtrate reducer according to claim 1, wherein under the protection of nitrogen, NaOH solution, organic solvent and refined cotton are sequentially added into a reaction kettle, alkalized for 1.5h at 20-25 ℃, chloroacetic acid is added, the temperature is increased to 50 ℃ for reaction for 1-2h, glacial acetic acid is used for adjusting the pH value to 4-6, organic amine is added, the temperature is increased to 180 ℃ for reaction for 2h, and filter pressing and discharging are carried out to obtain the oil-based drilling fluid filtrate reducer.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB949058A (en) * 1959-10-14 1964-02-12 Continental Oil Co Improved low fluid loss additive and composition
EP1130074A1 (en) * 2000-03-02 2001-09-05 Institut Francais Du Petrole Filtrate reducing additive and well fluid containg it
US6806232B1 (en) * 2001-05-31 2004-10-19 Steve Cart Composition of drilling fluids comprising ground elastomeric crumb rubber material and a method of decreasing seepage and whole mud loss using such composition
WO2013162902A1 (en) * 2012-04-25 2013-10-31 Isp Investments Inc Synergistic combination of a fluid loss additive and rheology modifier
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
CN106085386A (en) * 2016-07-07 2016-11-09 中国石油集团川庆钻探工程有限公司 Water-based drilling fluid

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2446400B (en) * 2007-02-08 2009-05-06 Mi Llc Water-based drilling fluid
CN101602938B (en) * 2009-07-13 2012-11-28 北京理工大学 Preparation method of cellulose-based drilling fluid filtrate reducer
CN101624516A (en) * 2009-08-05 2010-01-13 湖北汉科新技术股份有限公司 Fluid loss additive of oil-base drilling fluid and preparation method thereof
US20140024560A1 (en) * 2012-07-19 2014-01-23 Intevep, S.A. Drilling fluid using surfactant package
CN104559948A (en) * 2013-10-27 2015-04-29 中国石油化工集团公司 Degradable fluid loss additive for oil-base drilling fluids and preparation method thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB949058A (en) * 1959-10-14 1964-02-12 Continental Oil Co Improved low fluid loss additive and composition
EP1130074A1 (en) * 2000-03-02 2001-09-05 Institut Francais Du Petrole Filtrate reducing additive and well fluid containg it
US6806232B1 (en) * 2001-05-31 2004-10-19 Steve Cart Composition of drilling fluids comprising ground elastomeric crumb rubber material and a method of decreasing seepage and whole mud loss using such composition
WO2013162902A1 (en) * 2012-04-25 2013-10-31 Isp Investments Inc Synergistic combination of a fluid loss additive and rheology modifier
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
CN106085386A (en) * 2016-07-07 2016-11-09 中国石油集团川庆钻探工程有限公司 Water-based drilling fluid

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
NH-SO1合成基钻井液基础油及体系性能研究;袁俊秀;《钻采工艺》;20160325;第36卷(第2期);第98-101页 *
Soy Protein Isolate As Fluid Loss Additive in Bentonite-Water-Based Drilling Fluids;Li, Mei-Chun; Wu, Qinglin; Song, Kunlin; 等.;《ACS APPLIED MATERIALS & INTERFACES》;20151111;第7卷(第44期);第24799-24809页 *

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