Biomass alcohol ether-based drilling fluid and preparation method thereof
阅读说明：本技术 一种生物质醇醚基钻井液及其制备方法 (Biomass alcohol ether-based drilling fluid and preparation method thereof ) 是由 单海霞 王中华 周亚贤 李彬 侯树刚 吕跃滨 于 2018-08-30 设计创作，主要内容包括：本发明提供了一种生物质醇醚基钻井液,由包括以下组分的原料制备而成：生物质醇醚基液85重量份～100重量份；乙酸钾水溶液0重量份～15重量份；有机土3重量份～5重量份；主乳化剂3重量份～5重量份；辅乳化剂2重量份～4重量份；复合降滤失剂3重量份～5重量份；复合封堵剂3重量份～5重量份；氧化钙1重量份～3重量份；所述生物质醇醚基液包括十二烷基丁醚、十四烷基丁醚、十六烷基丁醚和十八烷基丁醚中的一种或多种。与现有技术相比,本发明提供的生物质醇醚基钻井液采用特定含量组分,各组分之间具有较好的相互作用,使产品具有优良的润滑、抑制性能,同时又兼备绿色环保、可生物降解性。(The invention provides a biomass alcohol ether-based drilling fluid which is prepared from the following raw materials: 85-100 parts by weight of biomass alcohol ether base liquid; 0 to 15 parts by weight of a potassium acetate aqueous solution; 3-5 parts of organic soil; 3-5 parts of a main emulsifier; 2-4 parts of auxiliary emulsifier; 3-5 parts of composite filtrate reducer; 3-5 parts of composite plugging agent; 1 to 3 parts by weight of calcium oxide; the biomass alcohol ether base fluid comprises one or more of dodecyl butyl ether, tetradecyl butyl ether, hexadecyl butyl ether and octadecyl butyl ether. Compared with the prior art, the biomass alcohol ether-based drilling fluid provided by the invention adopts specific content components, and the components have good interaction, so that the product has excellent lubricating and inhibiting performances, and simultaneously has the advantages of environmental protection and biodegradability.)
1. The biomass alcohol ether-based drilling fluid is prepared from the following raw materials:
85-100 parts by weight of biomass alcohol ether base liquid;
0 to 15 parts by weight of a potassium acetate aqueous solution;
3-5 parts of organic soil;
3-5 parts of a main emulsifier;
2-4 parts of auxiliary emulsifier;
3-5 parts of composite filtrate reducer;
3-5 parts of composite plugging agent;
1 to 3 parts by weight of calcium oxide;
the biomass alcohol ether base fluid comprises one or more of dodecyl butyl ether, tetradecyl butyl ether, hexadecyl butyl ether and octadecyl butyl ether.
2. The biomass alcohol ether-based drilling fluid according to claim 1, wherein the mass concentration of the potassium acetate aqueous solution is 15-35%.
3. The biomass alcohol ether-based drilling fluid according to claim 1, wherein the organic soil is prepared by modifying sodium bentonite with alkyl quaternary ammonium salt; the number of carbon atoms of the alkyl quaternary ammonium salt is 12-30.
4. The biomass alcohol ether-based drilling fluid according to claim 1, wherein the primary emulsifier has a structure represented by formula I:
in the formula I, R1Is CH3(CH2)x-fatty chain x is 7; r2Is CH3(CH2)y-fatty chain y is 9 to 17; n is 1 to 4.
5. The biomass alcohol ether-based drilling fluid according to claim 1, wherein the co-emulsifier is prepared from oil processing waste through purification and amination.
6. The biomass alcohol ether-based drilling fluid according to claim 1, wherein the composite fluid loss additive is prepared by compounding modified humic acid amide and modified epoxy resin; the mass ratio of the modified humic acid amide to the modified epoxy resin is 1: 1.
7. the biomass alcohol ether-based drilling fluid according to claim 1, wherein the composite plugging agent is prepared by compounding sepiolite fibers, superfine calcium carbonate, rubber powder and mica powder; the sepiolite fiber, the superfine calcium carbonate, the rubber powder and the mica powder are compounded in a mass ratio of 55: 35: 5: 5.
8. the biomass alcohol ether based drilling fluid according to any one of claims 1 to 7, further comprising:
0.1 to 330 portions of barite.
9. The preparation method of the biomass alcohol ether-based drilling fluid according to any one of claims 1 to 7, comprising the following steps:
a) and sequentially mixing the biomass alcohol ether base fluid with organic soil, a primary emulsifier, an auxiliary emulsifier, a potassium acetate aqueous solution, a composite filtrate reducer, a composite plugging agent and calcium oxide to obtain the biomass alcohol ether base drilling fluid.
10. The method of claim 9, further comprising, after the mixing in step a):
barite was added to the resulting mixture.
Technical Field
The invention relates to the technical field of drilling fluid, in particular to biomass alcohol ether-based drilling fluid and a preparation method thereof.
Background
The shale gas resource exploration and development in China has been fully laid out, shale unstable collapse is one of the key factors which puzzle the large-scale drilling of the shale gas horizontal well in China at present, the synthetic base drilling fluid is widely used for drilling the shale gas horizontal well abroad due to strong inhibition, however, the base fluid used for preparing the synthetic base drilling fluid at present is mainly chemical products such as mineral oil, linear α olefin and the like, has the defects of poor biodegradability, low environmental acceptability and the like, and is limited in application in some environment sensitive areas.
The chinese patent application No. 201210579597.0 discloses a synthetic base drilling fluid, and the adopted base fluid is linear paraffin. Chinese patent application No. 201110292911.2 discloses a synthetic base drilling fluid, the base fluid used is a mixture of limonene, dipentene, ethylene glycol monobutyl ether, alkyl glycoside, alcohol ether carboxylate, white oil and dimethyl silicone oil. The Chinese patent document with the application number of 201210251278.7 discloses a coal-to-liquid constant-rheology synthetic base drilling fluid, and the base fluid is coal-to-liquid. Although the synthetic base drilling fluid disclosed above meets the drilling requirements of different complex wells in terms of performance, the analysis from the aspect of environmental acceptability shows that the used base fluids are all alkane compounds, the biodegradation difficulty is high, and drill cuttings produced after subsequent use are listed as national hazardous waste records (hazardous waste records number is HW-08) because of containing hydrocarbon/water mixtures. In summary, conventional synthetic-based drilling fluids are environmentally less acceptable.
With the increasingly strict national environmental protection requirements, environment-friendly synthetic base drilling fluids are developed, and non-mineral oil is adopted as the base fluid of the drilling fluids, so that the drilling fluids become the main direction for research and application of the drilling fluids. Therefore, the development of a drilling fluid system with high lubricating and inhibiting properties, environmental protection and biodegradability has become a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the invention aims to provide a biomass alcohol ether-based drilling fluid and a preparation method thereof, and the biomass alcohol ether-based drilling fluid provided by the invention has excellent lubricating and inhibiting properties, and simultaneously has the advantages of environmental protection and biodegradability.
The invention provides a biomass alcohol ether-based drilling fluid which is prepared from the following raw materials:
85-100 parts by weight of biomass alcohol ether base liquid;
0 to 15 parts by weight of a potassium acetate aqueous solution;
3-5 parts of organic soil;
3-5 parts of a main emulsifier;
2-4 parts of auxiliary emulsifier;
3-5 parts of composite filtrate reducer;
3-5 parts of composite plugging agent;
1 to 3 parts by weight of calcium oxide;
the biomass alcohol ether base fluid comprises one or more of dodecyl butyl ether, tetradecyl butyl ether, hexadecyl butyl ether and octadecyl butyl ether.
Preferably, the mass concentration of the potassium acetate aqueous solution is 15-35%.
Preferably, the organic soil is prepared by modifying sodium bentonite through alkyl quaternary ammonium salt; the number of carbon atoms of the alkyl quaternary ammonium salt is 12-30.
Preferably, the primary emulsifier has a structure represented by formula I:
in the formula I, R1Is CH3(CH2)x-fatty chain x is 7; r2Is CH3(CH2)y-fatty chain y is 9 to 17; n is 1 to 4.
Preferably, the auxiliary emulsifier is prepared from oil processing waste materials through purification and amination.
Preferably, the composite filtrate reducer is prepared by compounding modified humic acid amide and modified epoxy resin; the mass ratio of the modified humic acid amide to the modified epoxy resin is 1: 1.
preferably, the composite plugging agent is prepared by compounding sepiolite fibers, superfine calcium carbonate, rubber powder and mica powder; the sepiolite fiber, the superfine calcium carbonate, the rubber powder and the mica powder are compounded in a mass ratio of 55: 35: 5: 5.
preferably, the method further comprises the following steps:
0.1 to 330 portions of barite.
The invention also provides a preparation method of the biomass alcohol ether-based drilling fluid, which comprises the following steps:
a) and sequentially mixing the biomass alcohol ether base fluid with organic soil, a primary emulsifier, an auxiliary emulsifier, a potassium acetate aqueous solution, a composite filtrate reducer, a composite plugging agent and calcium oxide to obtain the biomass alcohol ether base drilling fluid.
Preferably, after the mixing in step a), the method further comprises:
barite was added to the resulting mixture.
The invention provides a biomass alcohol ether-based drilling fluid which is prepared from the following raw materials: 85-100 parts by weight of biomass alcohol ether base liquid; 0 to 15 parts by weight of a potassium acetate aqueous solution; is provided with3-5 parts of machine soil; 3-5 parts of a main emulsifier; 2-4 parts of auxiliary emulsifier; 3-5 parts of composite filtrate reducer; 3-5 parts of composite plugging agent; 1 to 3 parts by weight of calcium oxide; the biomass alcohol ether base fluid comprises one or more of dodecyl butyl ether, tetradecyl butyl ether, hexadecyl butyl ether and octadecyl butyl ether. Compared with the prior art, the biomass alcohol ether-based drilling fluid provided by the invention adopts specific content components, and the components have good interaction, so that the product has excellent lubricating and inhibiting performances, and simultaneously has the advantages of environmental protection and biodegradability. The experimental result shows that the biomass alcohol ether-based drilling fluid provided by the invention has the density of 0.9g/cm at the temperature of 120-180 DEG C3～2.3g/cm3Within the range, the apparent viscosity is less than 80mPa · s, the medium-pressure filtration loss is less than 3mL, and the high-temperature high-pressure filtration loss is less than 6 mL; and EC50＞106mg/L, good environmental safety, BOD5/CODCrReaches 0.58 percent, and has good biodegradability.
In addition, the preparation method provided by the invention is simple, the used raw materials are green and environment-friendly, the conditions are mild, and the method can be used for drilling complex wells such as shale gas horizontal wells, strong water-sensitive shale stratums and the like and in environment-sensitive areas.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a biomass alcohol ether-based drilling fluid which is prepared from the following raw materials:
85-100 parts by weight of biomass alcohol ether base liquid;
0 to 15 parts by weight of a potassium acetate aqueous solution;
3-5 parts of organic soil;
3-5 parts of a main emulsifier;
2-4 parts of auxiliary emulsifier;
3-5 parts of composite filtrate reducer;
3-5 parts of composite plugging agent;
1 to 3 parts by weight of calcium oxide;
the biomass alcohol ether base fluid comprises one or more of dodecyl butyl ether, tetradecyl butyl ether, hexadecyl butyl ether and octadecyl butyl ether.
In the invention, the biomass alcohol ether base fluid comprises one or more of dodecyl butyl ether, tetradecyl butyl ether, hexadecyl butyl ether and octadecyl butyl ether; wherein the structural formula of the dodecyl butyl ether is CH3CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2OCH2CH2CH2CH3(ii) a The structural formula of the tetradecyl butyl ether is CH3CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2OCH2CH2CH2CH3(ii) a The structural formula of the hexadecyl butyl ether is CH3CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2OCH2CH2CH2CH3(ii) a The structural formula of the octadecyl butyl ether is CH3CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2CH2OCH2CH2CH2CH3。
In the invention, the dodecyl butyl ether, the tetradecyl butyl ether, the hexadecyl butyl ether and the octadecyl butyl ether all belong to vegetable alcohol alkyl ethers, are biomass alcohol ether organic compounds, do not belong to mineral oil, and the preparation raw material is fatty alcohol extracted from vegetable oil; the compound is a green and nontoxic substance, has no stimulation to human body and environment, and has good ecological safety; meanwhile, the dodecyl butyl ether, the tetradecyl butyl ether, the hexadecyl butyl ether and the octadecyl butyl ether also have excellent inhibitive performance, strong temperature resistance, safety, environmental protection characteristic, hydrolytic stability and biodegradability, and can be used as a base liquid of the synthetic base drilling fluid. The dodecyl butyl ether, the tetradecyl butyl ether, the hexadecyl butyl ether and the octadecyl butyl ether have similar structures and performances, particularly the polarities of the four are equivalent, and the polarity is one of important performance indexes influencing the selection of a drilling fluid treating agent and the construction of a drilling fluid system; only if the polarity of the mixture is in a small change range, the subsequent organic soil, the emulsifier, the filtrate reducer and other finishing agents matched with the mixture can play a role in stabilizing, and further the performance of the prepared drilling fluid system can be kept stable. In addition, the price of the mixed alcohol of the fatty alcohol twelve, fourteen, sixteen and eighteen used as the raw material for synthesis is lower than that of the single alcohol of the lauryl alcohol, the tetradecanol, the cetyl alcohol and the stearyl alcohol; the mixture of the four is adopted for direct synthesis, so that the comprehensive cost can be greatly reduced.
In the invention, the lubricating coefficient of the biomass alcohol ether base liquid is preferably 0.08-0.10, and the kinematic viscosity at 40 ℃ is preferably 2.29mm2/s～3.01mm2And s. In the invention, the biomass alcohol ether base liquid is colorless transparent liquid or light yellow transparent liquid in appearance, has no unsaturated bond (ester bond and carbon-carbon double bond) in the structure, and has higher temperature resistance and hydrolytic stability. In the invention, the biomass alcohol ether-based drilling fluid comprises 85-100 parts by weight of biomass alcohol ether-based fluid, preferably 85-95 parts by weight, and more preferably 90 parts by weight.
In the present invention, the mass concentration of the potassium acetate aqueous solution is preferably 15% to 35%, and more preferably 20% to 30%. The source of the aqueous potassium acetate solution is not particularly limited in the present invention, and commercially available products or self-prepared products known to those skilled in the art may be used. According to the invention, potassium acetate is used as a water phase inhibitor instead of traditional calcium chloride, so that the inhibition of the system is enhanced and the preparation process is simplified; compared with calcium chloride, the potassium acetate is more environment-friendly, and the drilling fluid prepared from the potassium acetate has less influence on the environment. In the invention, the biomass alcohol ether-based drilling fluid comprises 0-15 parts by weight of potassium acetate aqueous solution, preferably 5-10 parts by weight, and more preferably 10 parts by weight.
In the invention, the organic soil is preferably prepared by modifying sodium bentonite through alkyl quaternary ammonium salt. In the invention, the alkyl quaternary ammonium salt is long-chain alkyl quaternary ammonium salt, and the number of carbon atoms of the alkyl quaternary ammonium salt is preferably 12-30, more preferably 18-25, and most preferably 20-22. In the preferred embodiment of the invention, the organic soil is HFGEL-120 which is a commercially available organic soil for drilling fluid. In the invention, the biomass alcohol ether-based drilling fluid comprises 3-5 parts by weight of organic soil, and preferably 4 parts by weight.
In the present invention, the primary emulsifier preferably has a structure represented by formula I:
in the formula I, R1Is CH3(CH2)x-fatty chain x is 7; r2Is CH3(CH2)y-fatty chain y is 9 to 17; n is 1 to 4. In the present invention, the emulsifier is preferably prepared by reacting tall oil acid, maleic anhydride, fatty acid and polyamine; wherein the tall oil acid has the general formula R1-CH＝CH-(CH2)7-COOH, said fatty acid having the formula R2-COOH, said polyamine having the formula NH2-(CH2-CH2)n-NH2N is 4-9; the molar ratio of tall oil acid, maleic anhydride, fatty acid and polyamine is preferably 1: (1-1.5): (2.5-3.5): (4-5), more preferably 1:1.5: 3: 5; the reaction temperature is preferably 130-160 ℃, and more preferably 140-150 ℃; the reaction time is preferably 3 to 5 hours, more preferably 4 hours.
In the invention, the main emulsifier contains a temperature-resistant group, is in a branched structure, has good emulsion stability, and simultaneously improves the shearing force of the drilling fluid by the branched structure, thereby maintaining the emulsion stability of the whole drilling fluid system and keeping better rheological property. In the invention, the biomass alcohol ether-based drilling fluid comprises 3-5 parts by weight of a primary emulsifier, and preferably 4 parts by weight.
In the invention, the auxiliary emulsifier is preferably prepared from oil processing waste materials through purification and amination. In a preferred embodiment of the invention, the coemulsifier is a biodegradable wetting agent FB-WOWET obtained by purifying and aminating grease processing waste materials, and is a commercially available product. In the invention, the coemulsifier can change the surface of solid phase particles in the system from hydrophilicity to lipophilicity, thereby being beneficial to the dispersion of the solid phase particles in the system in a base solution and having good suspension stability. In the invention, the biomass alcohol ether-based drilling fluid comprises 2-4 parts by weight of auxiliary emulsifier, preferably 3 parts by weight.
In the invention, the composite filtrate reducer is preferably prepared by compounding modified humic acid amide and modified epoxy resin; the mass ratio of the modified humic acid amide to the modified epoxy resin is preferably 1: 1. in a preferred embodiment of the invention, the modified humic acid amide is a patent product of China institute of oil and gas group drilling engineering technology, with the patent number of 201410852346.4, and is commercially available from the institute of oil and gas group drilling engineering technology; the modified epoxy resin is acrylic acid modified low-viscosity epoxy resin WSR-615, and can be purchased from a tin-free petrochemical general factory. By adopting the composite filtrate reducer, the invasion of drilling fluid filtrate to the well wall can be reduced, and a good mud cake is formed. In the invention, the biomass alcohol ether-based drilling fluid comprises 3-5 parts by weight of the composite filtrate reducer, and preferably 4 parts by weight.
In the invention, the composite plugging agent is preferably compounded by sepiolite fibers, superfine calcium carbonate, rubber powder and mica powder; the preferable mass ratio of the sepiolite fibers, the superfine calcium carbonate, the rubber powder and the mica powder is 55: 35: 5: 5. the composite plugging agent has the characteristic of combining rigid particle size and flexible particle size, and has excellent plugging capability. In the invention, the biomass alcohol ether-based drilling fluid comprises 3-5 parts by weight of the composite plugging agent, preferably 4 parts by weight.
The source of the calcium oxide is not particularly limited in the present invention, and commercially available products known to those skilled in the art may be used. In the invention, the biomass alcohol ether-based drilling fluid comprises 1-3 parts by weight of calcium oxide, and preferably 2 parts by weight.
In the present invention, the biomass alcohol ether based drilling fluid preferably further comprises:
0.1 to 330 portions of barite. The source of the barite is not particularly limited in the present invention, and commercially available products well known to those skilled in the art may be used. In the present invention, the density of the barite is preferably 4g/cm3～5g/cm3More preferably 4.3g/cm3. In a preferred embodiment of the invention, a density of 0.9g/cm can be prepared by adding 0.1g to 330g of barite per 100mL of the above raw material mixture3～2.3g/cm3The biomass alcohol ether base drilling fluid. The density of the biomass alcohol ether-based drilling fluid prepared by the invention can be as low as 0.9g/cm on the premise of meeting the requirement of well cleaning3The application range of the underbalance process for the low-pressure low-permeability stratum is wider, and the negative pressure is larger.
The biomass alcohol ether base liquid adopted by the invention is green and nontoxic; the structure of the composite material comprises saturated long-chain aliphatic groups and alkyl ether groups, does not have unsaturated bonds (ester bonds and carbon-carbon double bonds), does not belong to alkane, and has good inhibition, high temperature resistance, hydrolytic stability and biodegradability. The biomass alcohol ether-based drilling fluid formed by taking the mixture of dodecyl butyl ether, tetradecyl butyl ether, hexadecyl butyl ether and octadecyl butyl ether as a base fluid is a green environment-friendly drilling fluid system, and drilling cuttings generated subsequently are not listed in the national hazardous waste record and do not belong to hazardous wastes; due to the fact thatThe subsequent treatment and disposal of the drill cuttings are simpler than that of the traditional synthetic base drilling fluid, and the pressure of the subsequent environmental protection treatment and disposal can be effectively reduced. Meanwhile, through the compatibility of the key treating agent and the comprehensive action of various components in the drilling fluid, the biomass alcohol ether-based drilling fluid provided by the invention has the advantages of good rheological property, strong suspended sand carrying capacity, good thermal stability and high temperature resistance of over 180 ℃. In conclusion, the biomass alcohol ether base fluid used by the drilling fluid provided by the invention is non-toxic, green and environment-friendly, and has good characteristics in the aspects of rheology, high-temperature and high-pressure filtration loss, formation protection, biodegradability and the like. Experimental results show that the density of the biomass alcohol ether-based drilling fluid provided by the invention is 0.9g/cm3～2.3g/cm3Rolling for 16h at constant temperature of 120-180 ℃, taking out, and testing in the environment of 60 ℃, wherein the test has good effects on rheological property, suspension stability, filtration loss reduction, biotoxicity and other indexes.
The invention also provides a preparation method of the biomass alcohol ether-based drilling fluid, which comprises the following steps:
a) and sequentially mixing the biomass alcohol ether base fluid with organic soil, a primary emulsifier, an auxiliary emulsifier, a potassium acetate aqueous solution, a composite filtrate reducer, a composite plugging agent and calcium oxide to obtain the biomass alcohol ether base drilling fluid.
The biomass alcohol ether base fluid is sequentially mixed with organic soil, a primary emulsifier, an auxiliary emulsifier, a potassium acetate aqueous solution, a composite filtrate reducer, a composite plugging agent and calcium oxide to obtain the biomass alcohol ether base drilling fluid. In the invention, the biomass alcohol ether base liquid, the organic soil, the main emulsifier, the auxiliary emulsifier, the potassium acetate aqueous solution, the composite filtrate reducer, the composite plugging agent and the calcium oxide are the same as those in the technical scheme, and are not repeated herein.
The mixing method is not particularly limited in the present invention, and mechanical stirring or manual stirring techniques well known to those skilled in the art can be adopted. In a preferred embodiment of the present invention, the mixing is performed by mechanical stirring; the rotation speed of the mechanical stirring is preferably 8000 r/min-10000 r/min. In the present invention, the temperature of the mixing is preferably 45 to 50 ℃.
In the present invention, the mixing process preferably includes:
a1) adding the biomass alcohol ether base liquid and the organic soil into a stirring container, and stirring for 15-20 min to obtain a first mixture;
a2) sequentially adding a main emulsifier and an auxiliary emulsifier into the first mixture, and stirring for 20-30 min to obtain a second mixture;
a3) adding a potassium acetate aqueous solution into the second mixture, and stirring for 20-30 min to obtain a third mixture;
a4) and sequentially adding the composite filtrate reducer, the composite plugging agent and calcium oxide into the third mixture, and stirring for 20-30 min to obtain the biomass alcohol ether-based drilling fluid.
In the present invention, after the mixing, it is preferable to further include:
barite was added to the resulting mixture. In the present invention, the barite is the same as that described in the above technical solution, and is not described herein again.
In the invention, the preferable technical scheme of adding barite is as follows:
a1) adding the biomass alcohol ether base liquid and the organic soil into a stirring container, and stirring for 15-20 min to obtain a first mixture;
a2) sequentially adding a main emulsifier and an auxiliary emulsifier into the first mixture, and stirring for 20-30 min to obtain a second mixture;
a3) adding a potassium acetate aqueous solution into the second mixture, and stirring for 20-30 min to obtain a third mixture;
a4) adding the composite filtrate reducer, the composite plugging agent and the calcium oxide into the third mixture in sequence, and stirring for 20-30 min to obtain a mixture;
a5) adding barite into the mixture, and stirring for 30-35 min to obtain the biomass alcohol ether-based drilling fluid.
The preparation method of the biomass alcohol ether-based drilling fluid provided by the invention has simple process steps and easy operation, and by adopting the specific steps, various treating agents can be fully mixed and dissolved in the biomass alcohol ether-based fluid to form stable emulsion.
In summary, the biomass alcohol ether-based drilling fluid provided by the invention integrates various advantages of the traditional mineral oil drilling fluid and the existing synthetic base cobalt well fluid, and simultaneously has the following advantages: the plugging property is good; high viscosity cutting and strong rock carrying capacity; the lower limit of the density is low; low biological toxicity and good environmental safety; and the preparation process is simple.
The invention provides a biomass alcohol ether-based drilling fluid which is prepared from the following raw materials: 85-100 parts by weight of biomass alcohol ether base liquid; 0 to 15 parts by weight of a potassium acetate aqueous solution; 3-5 parts of organic soil; 3-5 parts of a main emulsifier; 2-4 parts of auxiliary emulsifier; 3-5 parts of composite filtrate reducer; 3-5 parts of composite plugging agent; 1 to 3 parts by weight of calcium oxide; the biomass alcohol ether base fluid comprises one or more of dodecyl butyl ether, tetradecyl butyl ether, hexadecyl butyl ether and octadecyl butyl ether. Compared with the prior art, the biomass alcohol ether-based drilling fluid provided by the invention adopts specific content components, and the components have good interaction, so that the product has excellent lubricating and inhibiting performances, and simultaneously has the advantages of environmental protection and biodegradability. The experimental result shows that the biomass alcohol ether-based drilling fluid provided by the invention has the density of 0.9g/cm at the temperature of 120-180 DEG C3～2.3g/cm3Within the range, the apparent viscosity is less than 80mPa · s, the medium-pressure filtration loss is less than 3mL, and the high-temperature high-pressure filtration loss is less than 6 mL; and EC50＞106mg/L, good environmental safety, BOD5/CODCrReaches 0.58 percent, and has good biodegradability.
In addition, the preparation method provided by the invention is simple, the used raw materials are green and environment-friendly, the conditions are mild, and the method can be used for drilling complex wells such as shale gas horizontal wells, strong water-sensitive shale stratums and the like and in environment-sensitive areas.
To further illustrate the present invention, the following examples are provided for illustration. The raw materials used in the following examples of the present invention are all commercially available products; wherein, the volume fraction composition of the biomass alcohol ether base fluid is shown in the table 1; the used organic soil is HFGEL-120 for the drilling fluid, which is purchased from Zhejiang Fenghong New materials GmbH; the main emulsifier, the auxiliary emulsifier and the composite plugging agent are all provided by the research institute of drilling engineering technology of central petrochemical central petroleum engineering Limited company; the compound filtrate reducer is purchased from the research institute of drilling engineering technology of the petroleum and natural gas group of China.
Table 1 composition of the volume fractions of biomass alcohol ether based fluids used in the following examples of the invention
B1
Dodecyl butyl ether
B2
Tetradecyl butyl ether
B3
Cetyl butyl ether
B4
Octadecyl butyl ether
B5
Dodecyl butyl ether: tetradecyl butyl ether ═ 8: 2
B6
Dodecyl butyl ether: cetyl butyl ether 5: 5
B7
Dodecyl butyl ether: octadecyl butyl ether ═ 1: 9
B8
Tetradecyl butyl ether: cetyl butyl ether-8: 2
B9
Tetradecyl butyl ether: octadecyl butyl ether 5: 5
B10
Cetyl butyl ether: octadecyl butyl ether ═ 1: 9
B11
Dodecyl butyl ether: tetradecyl butyl ether: octadecyl butyl ether ═ 3: 3: 4
B12
Tetradecyl butyl ether: cetyl butyl ether: octadecyl butyl ether ═ 1: 7: 2
B13
Dodecyl butyl ether: cetyl butyl ether: octadecyl butyl ether ═ 9: 0.5: 0.5
B14
Dodecyl butyl ether: tetradecyl butyl ether: cetyl butyl ether: octadecyl butyl ether ═ 1: 1: 1: 1
B15
Dodecyl butyl ether: tetradecyl butyl ether: cetyl butyl ether: octadecyl butyl ether ═ 3: 2: 2: 3
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