CN107325797B - Low oil-water ratio oil-based drilling fluid and preparation method thereof - Google Patents
Low oil-water ratio oil-based drilling fluid and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a low oil-water ratio oil-based drilling fluid which is prepared by mixing components comprising an oil phase, a water phase, an emulsifier, a wetting agent, a lipophilic colloid, a filtrate loss reducer, lime and an optional weighting agent, wherein the oil-water ratio of the drilling fluid is (60:40) - (75: 25). The invention also relates to a preparation method of the low oil-water ratio oil-based drilling fluid, and the oil-based drilling fluid prepared by the method has the characteristics of low oil-water ratio, high viscosity-shear rate, strong salt carrying capacity, good rheological property, good suspension stability, low toxicity and the like, the demulsification voltage of the drilling fluid can reach more than 500V, the high-temperature high-pressure water loss is less than 3mL, the system lubricating property is good, and the method is suitable for special construction processes of large-inclination directional wells, shale horizontal wells, various complex stratum wells and the like.
Description
Technical Field
The invention belongs to the technical field of drilling fluid for petroleum exploration wells and production wells, and particularly relates to low oil-water ratio oil-based drilling fluid and a preparation method thereof.
Background
Oil-based drilling fluids refer to drilling fluids having oil as the continuous phase. Compared with water-based drilling fluid, the oil-based drilling fluid has the advantages of high temperature resistance, salt and calcium corrosion resistance, good lubricity, contribution to well wall stability, smaller damage degree to oil-gas layers and the like.
The foreign oil-based drilling fluid develops rapidly. The Exxon company develops a water-in-oil emulsified drilling fluid with high oil-water ratio iron ore powder weight, which takes diesel oil as engine oil, the water content of the drilling fluid is 8-10 wt%, and iron oxide powder weight is selected to reduce the volume percentage content of solid phase in the system. The result is a significant reduction in plastic viscosity and flow resistance at high shear rates at the nozzle, resulting in increased rates of penetration, but higher levels of emulsifier are required and diesel fuel is highly toxic.
The domestic oil-based drilling fluid also makes great progress. The field effect shows that the system effectively protects the reservoir and greatly improves the oil and gas yield of the test well, but the system has the problem of serious environmental pollution.
Most of oil-based drilling fluid systems adopt crude oil or diesel oil as base oil, and the problems of serious environmental pollution, difficult pollutant treatment, high treatment cost and the like generally exist. With stricter regulations on environmental protection in various countries, low-toxicity mineral oil is adopted as a dispersion medium at home and abroad in recent years, and performance requirements of different strata are met by adjusting oil-water ratio and using other treating agents. The main difference between low toxicity oil-based drilling fluids and conventional oil-based drilling fluids is the base oil used to formulate the drilling fluids. The base oil adopted by the low-toxicity or non-toxic oil-based drilling fluid is refined oil (called white oil), the white oil is low-toxicity mineral oil, and the white oil-based drilling fluid not only has all the characteristics of other oil-based drilling fluids, but also has the advantages of low toxicity, safety, environmental protection and the like.
The environment-friendly high-performance invert emulsion oil-based drilling fluid (HP-IE drilling fluid) developed by Halliburton corporation abroad is a prominent representative of the commercial development of shale gas horizontal wells. The HP-IE drilling fluid takes a mixture of liquid paraffin oil and refined mineral oil as a continuous phase, and the oil-soluble polymer is used for improving the viscosity of the oil phase of the drilling fluid and abandoning organic soil.
There are also oil-based drilling fluid systems in China that use white oil as the continuous phase. The patents CN102304353B and CN102134477B disclose oil-based drilling fluids using white whole oil as the continuous phase, which are suitable for low pressure low permeability formations. Patent CN102031095A discloses a water-in-oil type oil-based drilling fluid using white oil as a continuous phase, wherein the temperature resistance of the drilling fluid reaches 240 ℃, the problem of insufficient temperature resistance of the existing drilling fluid can be overcome, and the requirement of a deep well and an ultra-deep well on the temperature resistance of the drilling fluid can be favorably met. The document research and application of a high-temperature-resistant water-in-oil emulsifier discloses a high-temperature-resistant white oil-based drilling fluid system with the oil-water ratio of 85:15, and the system density is 1.5g/cm3And 1.8g/cm3When the temperature is high, the temperature resistance can reach 220 ℃. The application of white oil-based drilling fluid in shallow sea area of eastern Ji in the literature discloses an oil-water ratio of 80:20 and a density of 1.2g/cm3The white oil-based drilling fluid has good rheological property, electrical stability and high-temperature thermal stability, has low density and thixotropy, is low in plastic viscosity, and is beneficial to improving the drilling speed. The document 'high temperature resistant high density low toxicity water-in-oil drilling fluid technology' discloses a high temperature resistant high density low toxicity water-in-oil drilling fluid technology, the oil-based drilling fluid system adopts 3# white oil as a continuous phase, has strong inhibition and strong pollution resistance, and can solve the technical problems of complex stratum, mud shale water swelling, poor lubricating and drag reducing effects, poor reservoir protection effects and the like.
The oil-based drilling fluid in the prior art still mainly has high oil-water ratio, the oil-water ratio of the water-in-oil type drilling fluid is mostly 80:20, and the oil-water ratio of some systems is even higher. In addition, based on the consideration of on-site safety and limited by technology, a large amount of treating agent is often added into the drilling fluid with high oil-water ratio, which brings great difficulty to the reduction of the comprehensive cost of the oil-based drilling fluid; meanwhile, the drilling cuttings produced by the drilling fluid with high oil-water ratio have high oil content, and difficulty is brought to later-stage environment-friendly treatment. Although research reports about low oil-water ratio drilling fluid systems exist in the prior art, a large amount of emulsifier is often added into the drilling fluid system, and the excessive addition of the emulsifier can change the hydrophilic lipophilic group on the rock surface in pores, so that reservoir damage is caused. Therefore, the problem existing at present is that research and development of the low oil-water ratio oil-based drilling fluid with low addition amount of the emulsifier and the preparation method thereof are urgently needed.
Disclosure of Invention
The invention aims to solve the technical problem of providing the low oil-water ratio oil-based drilling fluid aiming at the defects of the prior art. The drilling fluid is a water-in-oil type drilling fluid which is prepared by taking low-toxicity environment-friendly white oil and a low-addition-amount emulsifier as main components and has an oil-water ratio of (60:40) - (75: 25). The oil-based drilling fluid has the characteristics of low oil-water ratio, high viscosity-shear, strong salt carrying capacity, good rheological property, good suspension stability, low toxicity and the like.
To this end, the invention provides in a first aspect a low oil-to-water ratio oil-based drilling fluid made by mixing components comprising an oil phase, a water phase, an emulsifier, a wetting agent, a lipophilic colloid, a fluid loss additive, lime and optionally a weighting agent; wherein the oil-water ratio of the drilling fluid is (60:40) - (75: 25); preferably, the oil-water ratio of the drilling fluid is (60:40) - (70: 30); more preferably, the oil-water ratio of the drilling fluid is (60:40) - (65: 35).
According to the invention, the drilling fluid comprises, based on the total volume of component a and component b:
in some preferred embodiments of the invention, the drilling fluid comprises, based on the total volume of component a and component b:
the term "v%" as used herein means volume percent. For example, if the total volume of component a and component b is 100mL, then "component a, oil phase 60 v% to 75 v%" means that the oil phase is 60 to 75 mL.
The term "wt%" as used herein means weight volume percent. For example, if the total volume of component a and component b is 100mL, then "component c, emulsifier 2.5 wt% to 4.0 wt%" means emulsifier 2.5 to 4.0 g.
In some embodiments of the invention, the oil phase comprises one or more of mineral # 5 white oil, # 3 white oil, and # 7 white oil.
In other embodiments of the present invention, the aqueous phase is a salt solution; the mass fraction of solute in the salt solution is 20 wt% -30 wt%; preferably, the mass fraction of solute in the salt solution is 25 wt%. Preferably the salt comprises one or more of calcium chloride, sodium chloride and potassium chloride.
According to the invention, the emulsifiers comprise a primary emulsifier and a secondary emulsifier; the weight ratio of the main emulsifier to the auxiliary emulsifier is (3-5) to 2.
According to the invention, the primary emulsifier is a fatty acid sorbitan ester nonionic surfactant. In some embodiments of the invention, the fatty acid sorbitan ester nonionic surfactant comprises one or more of sorbitan monooleate, sorbitan trioleate and sorbitan monostearate.
According to the invention, the coemulsifier is a fatty acid alcanolamine nonionic surfactant. In some embodiments of the invention, the fatty acid alcamines nonionic surfactant comprises one or more of oleic acid diethanolamine, coconut oil diethanolamine, oleic acid triethanolamine, and oleic acid monoethanolamine.
According to the invention, the wetting agent comprises one or more of dodecyltrimethylammonium bromide, polyoxyethylene dioleate and polyoxypropylene stearate.
In some embodiments of the invention, the lipophilic colloid is one or more of an organoclay, a polyamide resin, and a fatty acid soap.
In other embodiments of the present invention, the fluid loss additive comprises humic acid amide and/or oxidized bitumen.
In some embodiments of the invention, the lime is calcium oxide.
In other embodiments of the present invention, the weighting agent comprises barite and/or lime powder.
According to the invention, the barite is an optional added component, and the adding amount of the barite is determined according to the density requirement of the drilling fluid.
In a second aspect, the present invention provides a method for preparing the drilling fluid according to the first aspect, which comprises:
step S1, stirring and mixing the component a, the component c and the component d to prepare a mixture I;
step S2, stirring and mixing the mixture I and the component b to obtain a mixture II;
and step S3, stirring and mixing the mixture II with the component e, the component f, the component g and the optional component h to prepare the low oil-water ratio oil-based drilling fluid.
According to the method of the invention, the oil phase of the component a and the water phase of the component b are not mutually soluble, a surfactant is added for treatment and then mixed, and the emulsifier of the component c and the wetting agent of the component d are both surfactants, therefore, in the method for preparing the drilling fluid, the component a, the component c and the component d are stirred and mixed firstly, and then the water phase of the component b is added to obtain the stable water-in-oil emulsion. After a stable water-in-oil emulsion is formed, solid-phase particles such as a lipophilic colloid component e, a filtrate reducer component f, a lime component g and an optional weighting agent component f are respectively added, and the water-in-oil emulsion is uniformly dispersed to form the stable oil-based drilling fluid through stirring and mixing treatment.
According to the process of the invention, in step S3, components e, f and g are added in no sequential order. For example, in some embodiments of the present invention, the mixture II is first stirred and mixed with the component e, then the component f is added to be stirred and mixed, then the component g is added to be stirred and mixed, and finally the component h is added to be stirred and mixed. In other embodiments of the present invention, the mixture II and the component f are stirred and mixed, then the component g is added to be stirred and mixed, then the component e is added to be stirred and mixed, and finally the component h is added to be stirred and mixed. In other embodiments of the present invention, the mixture II and the component g are stirred and mixed, then the component f is added to be stirred and mixed, then the component e is added to be stirred and mixed, and finally the component h is added to be stirred and mixed.
According to the method, the stirring and mixing treatment in each step is high-speed stirring and mixing treatment. In some embodiments of the invention, the time of the stirring and mixing treatment is 20-30 min; the rotating speed of the stirring and mixing treatment is 10000-12000 r/min.
The invention adopts high-speed stirring and mixing treatment to form stable water-in-oil emulsion by the oil-water two phases which are not mutually soluble under the action of the emulsifier and the wetting agent. The higher the rotating speed of stirring and mixing treatment is, the more favorable the dispersion of the water phase into smaller droplets is, and the higher the stability of the formed emulsion is; meanwhile, the high-speed stirring and mixing treatment is also beneficial to the uniform dispersion of solid phase particles such as oleophilic colloid, a filtrate reducer, lime, an optional weighting agent and the like in the emulsion, thereby forming the stable oil-based drilling fluid.
The term "water" as used herein refers to tap water unless otherwise specified.
The term "optional" as used herein means either with or without, and with or without the addition of.
The low oil-water ratio drilling fluid used in the present invention can be prepared from commercially available raw materials, unless otherwise specified.
Drilling fluids with low oil-to-water ratios typically require high addition levels of emulsifiers to form stable water-in-oil emulsions. The inventor of the invention researches and discovers that the low oil-water ratio drilling fluid formula can still form stable water-in-oil emulsion even under the condition of low addition amount of an emulsifier, and the drilling fluid has stable rheological property, good emulsification stability and low toxicity.
The low oil-water ratio oil-based drilling fluid provided by the invention has the following advantages:
(1) the drilling fluid provided by the invention has the advantages of low oil-water ratio, high viscosity-shear, strong salt carrying capacity, good rheological property and good suspension stability;
(2) the demulsification voltage of the drilling fluid provided by the invention can reach more than 500V, is higher than the requirement (more than or equal to 400V) of an emulsifier for SY/T6615-;
(3) the drilling fluid provided by the invention is suitable for special construction processes such as a large-inclination directional well, a shale horizontal well and various complex stratum wells.
Detailed Description
In order that the present invention may be more readily understood, the following detailed description of the invention is given by way of example only, and is not intended to limit the scope of the invention.
(1) The density of the drilling fluid is measured by adopting a method and an instrument specified in GB/T16783.2-2012 petroleum and natural gas industry drilling fluid field test 2 part oil-based drilling fluid;
(2) measuring the plastic viscosity of the drilling fluid by adopting a method and an instrument specified in GB/T16783.2-2012 petroleum and natural gas industry drilling fluid field test 2 part oil-based drilling fluid;
(3) the dynamic shear force of the drilling fluid is measured by adopting a method and an instrument specified in GB/T16783.2-2012 petroleum and natural gas industry drilling fluid field test 2 nd part oil-based drilling fluid;
(4) the demulsification voltage of the drilling fluid is measured by adopting a method and an instrument specified in GB/T16783.2-2012 petroleum and natural gas industry drilling fluid field test 2 nd part of oil-based drilling fluid;
(5) determining API (American Petroleum institute) filtration loss and High Temperature High Pressure (HTHP) filtration loss of the drilling fluid by using a method and an instrument specified in GB/T16783.2-2012 petroleum and natural gas industry drilling fluid field test 2 part oil-based drilling fluid; the high-temperature and high-pressure filtration loss is measured at the aging temperature of the drilling fluid, and the pressure is 3.5 MPa.
(6) The lubrication coefficient of the drilling fluid is measured by adopting a method and an instrument specified by a lubricating agent evaluation program for the drilling fluid in SY/T6094 and 1994 oil and gas industry.
Examples
Example 1
(1) The formula of the drilling fluid with the oil-water ratio of 60:40 is as follows: mineral # 5 white oil, calculated on the total volume of oil and water phases: 60.0 v%; CaCl with the mass fraction of 25%2Water phase: 40.0 v%; an emulsifier (the main emulsifier is sorbitan monooleate, the auxiliary emulsifier is oleic acid diethanolamine, and the weight ratio of the main emulsifier to the auxiliary emulsifier is 5: 2): 4.0 wt%; dodecyl trimethyl ammonium bromide: 0.5 wt%; organic soil: 1.5 wt%; humic acid amide: 4.0 wt%; calcium oxide: 1.5 wt%; the barite is weighted to a density of 1.20g/cm3The oil-based drilling fluid.
(2) The preparation method of the drilling fluid comprises the following steps: adding 11.43g of sorbitan monooleate, 4.57g of oleic acid diethanolamine and 2g of dodecyl trimethyl ammonium bromide into 240mL of white oil according to the component ratio, and stirring at a high speed of 12000r/min in a high-speed stirrer for 20 min; adding CaCl with the mass fraction of 25 percent under the high-speed stirring state2Stirring 160mL of water phase at high speed for 20 min; then 6g of organic soil is added to be stirred at a high speed for 20 min; then 16g of humic acid amide is added to be stirred at high speed for 20 min; then adding 6g of calcium oxide, and stirring at high speed for 20 min; and finally, adding barite, and stirring at a high speed for 20min to obtain the oil-based drilling fluid.
(3) Evaluating the performance of the drilling fluid: the properties of the drilling fluid produced were first tested before the drilling fluid aging performance test was performed, and the results are shown in table 1. The drilling fluid was then placed in a high temperature aging tank and aged by rolling at 100 ℃ for 16h, and the aged drilling fluid was tested for properties after cooling to 50 ℃ with the results shown in table 1.
Example 2
(1) The formula of the drilling fluid with the oil-water ratio of 65:35 is as follows: mineral # 5 white oil, calculated on the total volume of oil and water phases: 65.0 v%; CaCl with the mass fraction of 25%2Water phase: 35.0 v%; an emulsifier (the main emulsifier is sorbitan monooleate, the auxiliary emulsifier is oleic acid diethanolamine, and the weight ratio of the main emulsifier to the auxiliary emulsifier is 2: 1): 3.5 wt%; dodecyl trimethyl ammonium bromide: 0.75 wt%; organic soil: 2.0 wt%; humic acid amide: 4.0 wt%; calcium oxide: 1.5 wt%; barite is weighted to denseThe degree is 1.50g/cm3The oil-based drilling fluid.
(2) The preparation method of the drilling fluid comprises the following steps: adding 9.33g of sorbitan monooleate, 4.67g of oleic acid diethanolamine and 3g of dodecyl trimethyl ammonium bromide into 240mL of white oil according to the component ratio, and stirring at a high speed of 12000r/min in a high-speed stirrer for 20 min; adding CaCl with the mass fraction of 25 percent under the high-speed stirring state2Stirring 160mL of water phase at high speed for 20 min; then 16g of humic acid amide is added to be stirred at high speed for 20 min; then 6g of calcium oxide is added to be stirred at high speed for 20 min; then adding 8g of organic soil, and stirring at high speed for 20 min; and finally, adding barite, and stirring at a high speed for 20min to obtain the oil-based drilling fluid.
(3) The drilling fluid properties were evaluated as in example 1.
Example 3
(1) The formula of the drilling fluid with the oil-water ratio of 70:30 is as follows: mineral # 5 white oil, calculated on the total volume of oil and water phases: 70.0 v%; CaCl with the mass fraction of 25%2Water phase: 30.0 v%; an emulsifier (the main emulsifier is sorbitan trioleate, the auxiliary emulsifier is coconut oil diethanolamine, and the weight ratio of the main emulsifier to the auxiliary emulsifier is 2: 1): 3.0 wt%; dodecyl trimethyl ammonium bromide: 1.0 wt%; organic soil: 2.5 wt%; humic acid amide: 4.0 wt%; calcium oxide: 1.5 wt%; the barite is weighted to a density of 1.50g/cm3The oil-based drilling fluid.
(2) The preparation method of the drilling fluid comprises the following steps: adding 8g of sorbitan trioleate, 4g of coconut oil diethanolamine and 4g of dodecyl trimethyl ammonium bromide into 240mL of white oil according to the component ratio, and stirring at a high speed of 12000r/min in a high-speed stirrer for 20 min; adding CaCl with the mass fraction of 25 percent under the high-speed stirring state2Stirring 160mL of water phase at high speed for 20 min; then 6g of calcium oxide is added to be stirred at high speed for 20 min; then 16g of humic acid amide is added to be stirred at high speed for 20 min; then adding 10g of organic soil, and stirring at high speed for 20 min; and finally, adding barite, and stirring at a high speed for 20min to obtain the oil-based drilling fluid.
(3) The drilling fluid properties were evaluated as in example 1.
Example 4
(1) The formula of the drilling fluid with the oil-water ratio of 75:25 is as follows: mineral # 5 white oil, calculated on the total volume of oil and water phases: 75.0 v%; CaCl with the mass fraction of 25%2Water phase: 25.0 v%; an emulsifier (the main emulsifier is sorbitan trioleate, the auxiliary emulsifier is coconut oil diethanolamide, and the weight ratio of the main emulsifier to the auxiliary emulsifier is 3: 2): 2.5 wt%; dodecyl trimethyl ammonium bromide: 1.0 wt%; organic soil: 3.0 wt%; humic acid amide: 4.0 wt%; calcium oxide: 1.5 wt%; the barite is weighted to a density of 1.50g/cm3The oil-based drilling fluid.
(2) The preparation method of the drilling fluid comprises the following steps: adding 6g of sorbitan trioleate, 4g of coconut oil diethanolamine and 4g of dodecyl trimethyl ammonium bromide into 240mL of white oil according to the component ratio, and stirring at a high speed of 12000r/min in a high-speed stirrer for 20 min; adding CaCl with the mass fraction of 25 percent under the high-speed stirring state2Stirring 160mL of water phase at high speed for 20 min; then adding 12g of organic soil, and stirring at high speed for 20 min; then 6g of calcium oxide is added to be stirred at high speed for 20 min; then adding 16g of humic acid amide, and stirring at high speed for 20 min; and finally, adding barite, and stirring at a high speed for 20min to obtain the oil-based drilling fluid.
(3) The drilling fluid properties were evaluated as in example 1.
Example 5
(1) The formulation of the drilling fluid was the same as in example 1.
(2) The drilling fluid was prepared as in example 1.
(3) The drilling fluid performance was evaluated as in example 1, except that the temperature of the rolling aging was changed to 120 ℃.
Example 6
(1) The formulation of the drilling fluid was the same as in example 1.
(2) The drilling fluid was prepared as in example 1.
(3) The drilling fluid performance was evaluated as in example 1, except that the temperature of the rolling aging was changed to 150 ℃.
Example 7
According to the GB/T18420.2-2009 drilling fluid biotoxicity evaluation method, the biotoxicity of the oil-based drilling fluid in example 3 is investigated by a worm experiment indoors, and the LC50 of the drilling fluid is measured to be 19124 mg/L.
TABLE 1 Properties of oil-based drilling fluids
As can be seen from the data in the example 1, the example 5 and the example 6 in the table 1, the demulsification voltage of the oil-based drilling fluid with the oil-water ratio of 60:40 is in a small-amplitude reduction trend along with the increase of the aging temperature, but is above 500V; the plastic viscosity and the dynamic shear force of the drilling fluid are not changed greatly, the high-temperature high-pressure (HTHP) filtration loss is slightly increased but still smaller, and the filtration loss is 2.8mL after aging at 150 ℃. This shows that the drilling fluid of the present invention has good temperature resistance in the temperature range below 150 ℃. The lubricating coefficient of the low oil-water ratio drilling fluid is below 0.081 at different aging temperatures, which shows that the low oil-water ratio oil-based drilling fluid has better lubricating effect.
As can be seen from the data in examples 1-4 of Table 1, the viscosity of the drilling fluid increases slightly and the stability does not decrease much as the oil-to-water ratio decreases. For the oil-based drilling fluid, even the drilling fluid with the oil-water ratio as low as 60:40 has better electrical stability, and the drilling fluid has excellent performance, the oil-water ratio is reduced, and the cost of the base oil of the drilling fluid is greatly saved.
The biotoxicity data of the oil-based drilling fluid in example 7 show that the toxicity is higher than the standard that the oil-based drilling fluid LC50 can be discharged by more than 10000mg/L and the marine emission standard of China sea class (the marine emission standard of the sea class is LC50 is more than or equal to 15000 mg/L). Therefore, the oil-based drilling fluid prepared by the invention has relatively lower biotoxicity and is more suitable for construction in environmentally sensitive areas.
It should be noted that the above-mentioned embodiments are only for explaining the present invention, and do not constitute any limitation to the present invention. The present invention has been described with reference to exemplary embodiments, but the words which have been used herein are words of description and illustration, rather than words of limitation. The invention can be modified, as prescribed, within the scope of the claims and without departing from the scope and spirit of the invention. Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, but rather extends to all other methods and applications having the same functionality.
Claims (5)
1. A low oil-water ratio oil-based drilling fluid is prepared by mixing components including an oil phase, a water phase, an emulsifier, a wetting agent, a lipophilic colloid, a fluid loss additive, lime and an optional weighting agent; wherein the oil-water ratio of the drilling fluid is (60:40) - (75: 25); the emulsifier comprises a main emulsifier and a secondary emulsifier; the weight ratio of the main emulsifier to the auxiliary emulsifier is (3-5): 2;
the oil phase comprises one or more of mineral No. 5 white oil, No. 3 white oil and No. 7 white oil;
the main emulsifier is a fatty acid sorbitan ester nonionic surfactant; the fatty acid sorbitan ester nonionic surfactant comprises sorbitan monooleate and/or sorbitan trioleate;
the auxiliary emulsifier is fatty acid alcohol amine nonionic surfactant; the fatty acid alcohol amine nonionic surfactant comprises oleic acid diethanolamine and/or coconut oil diethanolamine;
the wetting agent comprises dodecyl trimethyl ammonium bromide;
the fluid loss additive comprises humic acid amide;
the water phase is a salt solution; the mass fraction of solute in the salt solution is 25 wt%; the salt comprises one or more of calcium chloride, sodium chloride and potassium chloride;
the oleophilic colloid comprises organic soil; the lime is calcium oxide; the weighting agent comprises barite and/or lime powder;
based on the total volume of the component a and the component b, the drilling fluid comprises:
2. the drilling fluid of claim 1, wherein the oil-water ratio of the drilling fluid is (60:40) - (70: 30).
3. The drilling fluid of claim 1, wherein the oil-water ratio of the drilling fluid is (60:40) - (65: 35).
4. A method of preparing a drilling fluid according to any one of claims 1 to 3, comprising:
step S1, stirring and mixing the component a, the component c and the component d to prepare a mixture I;
step S2, stirring and mixing the mixture I and the component b to obtain a mixture II;
and step S3, stirring and mixing the mixture II with the component e, the component f, the component g and the optional component h to prepare the low oil-water ratio oil-based drilling fluid.
5. The production method according to claim 4, wherein the time of the stirring and mixing treatment is 20 to 30 min; the rotating speed of the stirring and mixing treatment is 10000-12000 r/min.
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| CN111349425B (en) * | 2020-04-23 | 2022-04-12 | 新疆塔里木油田建设工程有限责任公司 | Low-fluorescence lubricant for drilling fluid and preparation method thereof |
| CN115636899B (en) * | 2021-07-20 | 2024-01-30 | 中国石油天然气集团有限公司 | Super-hydrophobic polymer, preparation method, super-hydrophobic coating, composition and application |
| CN114634801B (en) * | 2022-03-10 | 2023-04-28 | 中国石油大学(华东) | Amphiphilic nano silicon dioxide solid emulsifier for oil-based drilling fluid and preparation method and application thereof |
| CN116426330A (en) * | 2022-12-20 | 2023-07-14 | 常州高特新材料股份有限公司 | Water-based silicon wafer diamond wire cutting fluid |
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