High-temperature-resistant high-density reversible water-in-oil/oil-in-water drilling fluid and preparation method thereof
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An oil-in-water drilling fluid, high-density technology, applied in the field of drilling fluid, can solve the problem of reversible emulsification of drilling fluid without emulsifiers
Active Publication Date: 2018-12-28
SOUTHWEST PETROLEUM UNIV
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[0005] The patent number of Chinese patent announcement: ZL03133993.X, has announced a kind of preparation method of reversible emulsifier and its application in oil base drilling fluid, but does not relate to this emulsifier and the reversible emulsified drilling fluid prepared by this emulsifier in Behavior after high temperature aging
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Embodiment 1
[0082] Add 1 mol of lauric acid, 1 mol of diethylenetriamine, and 0.1% catalyst KOH of the total mass of reactants in a four-neck flask equipped with a stirrer, a serpentine reflux condenser, a water separator, and a thermometer. Nitrogen gas was introduced to raise the temperature, and after all the materials were melted, stirring was started, and the water generated by the reaction was distilled off at 180°C. After reacting for 4 hours, add 1 mol of maleic anhydride and 0.5 mol of phenylenediamine, extract twice with ethyl acetate, and recrystallize three times from acetone to obtain a reversible emulsifier based on fatty amides and its derivatives.
Embodiment 2
[0084] In a four-neck flask equipped with a stirrer, a serpentine reflux condenser, a water separator, and a thermometer, add 1 mol of tall oil fatty acid, 1 mol of diethylenetriamine, and add 0.15% of the total mass of the reactant catalyst KOH . Nitrogen gas was introduced to raise the temperature, and after all the materials were melted, stirring was started, and the water generated by the reaction was distilled off at 150°C. After reacting for 4 hours, add 1 mol of maleic anhydride and 0.5 mol of phenylenediamine, extract twice with ethyl acetate, and recrystallize three times from acetone to obtain a reversible emulsifier.
Embodiment 3
[0086] In a four-necked flask equipped with a stirrer, a serpentine reflux condenser, a water separator, and a thermometer, add 1 mol of oleic acid, add 1 mol of N,N-dimethyl-1,3-propanediamine, and add The total mass of reactants is 0.4% catalyst KOH. Nitrogen gas was introduced to raise the temperature, and after all the materials were melted, stirring was started, and the water generated by the reaction was distilled off at 180°C. After reacting for 4 hours, add 1 mol of maleic anhydride and 0.5 mol of ethylenediamine, extract twice with ethyl acetate, and recrystallize three times from acetone to obtain a reversible emulsifier.
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Abstract
The invention provides high-temperature-resistant high-density reversible water-in-oil / oil-in-water drilling fluid which is composed of the following raw materials in parts by weight: 30-70 parts of an oil phase, 30-70 parts of an aqueous phase, 2-5 parts of a reversible emulsifier, 1-3 parts of an auxiliary emulsifier, 0-2 parts of organic soil, 1-4 parts of a filtrate reducer, 0-1 part of an alkalinity regulator, 0-0.5 part of a wetting agent, 0-2 parts of an enhancer and 0-800 parts of weighting materials. The reversible emulsifier is fatty acyl polyamines and derivatives thereof, and has astructural general formula of R1(CH2)m(CONH)n(C6H4)x(NH)y(NH2)zR2; the filtrate reducer is an amphiphilic filtrate reducer. The amphiphilic filtrate reducer comprises but is not limited to an amphiphilic polymer filtrate reducer, a hydrophilic modified asphalt filtrate reducer and a hydrophobic modified humic acid filtrate reducer. The compounded auxiliary emulsifier is a high HLB (Hydrophile-Lipophile Balance) value surfactant. The drilling fluid disclosed by the invention has directly adjustable density of 0.8-1.8g / cm<3>, and has excellent properties such as rheological property, suspensionstability, filter cake clearance, filter loss control, environment friendliness and stable reversibility of water-in-oil emulsion and oil-in-water emulsion in a range of 100-180 DEG C.
Description
technical field [0001] The invention relates to a high-temperature-resistant high-density reversible water-in-oil / oil-in-water drilling fluid and a preparation method thereof, belonging to the technical field of drilling fluids. Background technique [0002] Conventional water-in-oil drilling fluids usually have high emulsification stability and strong oil wetting properties, which will produce strong oil wetting properties on cuttings, drill strings and formations in contact with continuous oil phases, avoiding the use of water-based drilling fluids. A series of drilling problems caused by water-sensitive shale instability. However, conventional oil-based drilling fluids will cause a series of follow-up problems, such as: changes in the wettability of formations and cuttings, difficulty in removing mud cakes, decreased cementing bond strength, clogging of formations by emulsions, difficulty in handling oily cuttings, and high processing costs. higher. As a result, there a...
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