A kind of oil base drilling fluid based on chlorinated paraffin and its preparation method and application
A technology of oil-based drilling fluid and chlorinated paraffin, applied in the field of oil-based drilling fluid, can solve the problems of insufficient safety and environmental protection of oil-based drilling fluid, and achieve the effects of low cost, good lubricity and increased product density
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Embodiment 1
[0052] An oil-based drilling fluid based on chlorinated paraffin, including base fluid and additives, the total amount of base fluid is 400mL, the base fluid includes 80 parts of chlorinated paraffin-52# calculated in parts by volume, inorganic salt solution (25% calcium chloride solution) 20 parts; additives are added by volume to weight ratio, additives are: 5% composite viscosity reducer (ethylene vinyl acetate copolymer: isoamyl alcohol=1:2), 1.5% composite emulsifier (Span60: Tween60: stearin Calcium acid calcium: 50nm hydrophobic silica = 1:1:1:0.2), 1% organic soil, 2.5% fluid loss control agent (oxidized asphalt: organic lignite = 1:2), 2% alkalinity regulator (calcium oxide ).
[0053] The preparation method of above-mentioned oil base drilling fluid, comprises the steps:
[0054] Under high-speed stirring conditions, add compound viscosity reducer to chlorinated paraffin and stir for 30 minutes, then add compound emulsifier to make it fully dissolve, and prepare oil...
Embodiment 2
[0056] An oil-based drilling fluid based on chlorinated paraffin is formed on the basis of the formula in Example 1 by changing the type of base oil, the concentration of brine, the volume ratio of base fluid, the type and amount of additives, and the specific formula is: including base fluid and additives, The total amount of base liquid is 400mL, and the base liquid includes 75 parts of chlorinated paraffin-42# calculated by volume, 25 parts of inorganic salt solution (30% calcium chloride solution); additives are added according to the ratio of volume to weight, and the additives are: 6% compound Viscosity reducer (ethylene acrylate copolymer: n-pentanol = 1:4), 1.0% complex emulsifier (Span20: Tween80: sodium oleate: 20nm hydrophobic silica = 1:1:1:0.2), 1.5% Organic soil, 2.0% fluid loss control agent (sulfonated asphalt: humic acid amide = 2:1), 1.5% alkalinity regulator (calcium oxide).
[0057] The preparation method of the above chlorinated paraffin-based oil-based dr...
Embodiment 3
[0059] An oil-based drilling fluid based on chlorinated paraffin is formed by changing the base oil to chlorinated paraffin-52# on the basis of the formula in Example 2. The specific formula is: including base fluid and additives, the total amount of base fluid is 400mL, The base fluid includes 75 parts of base oil chlorinated paraffin-52# calculated in parts by volume: 25 parts of 30% calcium chloride solution; the additive is added in proportion to volume and weight, and the additive is: 6% composite viscosity reducer (ethylene acrylate copolymer : n-pentanol = 1:4), 1.0% composite emulsifier (Span20: Tween80: sodium oleate: 20nm hydrophobic silica = 1:1:1:0.2), 1.5% organic soil, 2.0% fluid loss control agent (sulfonated pitch: humic acid amide = 2:1), 1.5% alkalinity regulator (calcium oxide).
[0060] The preparation method of the above chlorinated paraffin-based oil-based drilling fluid is the same as that of Example 1.
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