Water-in-oil emulsion drilling fluid and preparation method thereof
An emulsified drilling fluid and water-in-oil technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as low temperature resistance, poor emulsion stability, etc., and achieve low filtration loss, good temperature resistance Good salt performance and high temperature resistance
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Embodiment 1
[0041] (a) Preparation of Lauroyl Hydroxyethylethylenediamine (x=2, y=1, z=0)
[0042] Add 17 parts of N-hydroxyethylethylenediamine and 1.75 parts of KOH into a reactor equipped with a sealed mechanical stirrer, a thermometer, a condenser tube, and a receiving bottle. After stirring at 120°C for 1 hour, slowly add lauric acid dropwise 35 parts of methyl esters were added dropwise within 1 hour. React at 155°C for 6 hours, the methanol generated in the reaction is collected into the receiving bottle through the condenser tube, and then the remaining low-boiling point products and reaction raw materials are distilled off under reduced pressure to obtain 39.7 parts of the target product lauroyl hydroxyethylethylenediamine .
[0043] (b) Preparation of composite emulsifier for oil-based drilling fluid
[0044] In terms of parts by mass, 50 parts of lauroyl hydroxyethyl ethylenediamine obtained in step (a), 5 parts of vegetable oleic acid monoethanolamide and 5 parts of oleic ac...
Embodiment 2
[0053] (a) Preparation of Lauroyl Hydroxyethylethylenediamine (x=2)
[0054] Add 17 parts of N-hydroxyethylethylenediamine and 0.35 parts of KOH into a reactor equipped with a sealed mechanical stirrer, a thermometer, a straight condenser tube, and a receiving bottle. After stirring at 150°C for 1 hour, slowly add 70 parts of methyl laurate were added dropwise within 1 hour. React at 180°C for 16 hours, the methanol generated in the reaction is collected into the receiving bottle through a straight condenser, and the remaining low-boiling products and reaction raw materials are distilled off under reduced pressure to obtain the target product fatty acyl hydroxyethyl ethylenediamine .
[0055] (b) Synthesis of N, N'-dilauroyl hydroxyethyl ethylenediamine polyoxyethylene ether (y=5, z=0)
[0056] Add 70 parts of N, N'-dilauroyl hydroxyethyl ethylenediamine synthesized in step (a), 3.5 parts of calcium oxide and calcium hydroxide mixture (the weight ratio of calcium oxide and c...
Embodiment 3
[0062] (a) Synthesis of N, N'-bisstearyl hydroxyethyl ethylenediamine (x=2)
[0063] Add 49 parts of N-hydroxyethylethylenediamine and 2.7 parts of KOH into a reactor equipped with a sealed mechanical stirrer, a thermometer, a straight condenser tube, and a receiving bottle. After stirring at 145°C for 1 hour, slowly add 270 parts of methyl stearate were added dropwise within 1 hour. React at 165°C for 12 hours, and the methanol generated in the reaction is collected into a receiving bottle through a straight condenser. The remaining low-boiling products and reaction raw materials were distilled off under reduced pressure to obtain the target product N,N'-bisstearyl hydroxyethyl ethylenediamine.
[0064] (b) Synthesis of N, N'-distearoyl hydroxyethyl ethylenediamine polyoxypropylene ether (y=1, z=10)
[0065] 203 grams of N, N'-distearoyl hydroxyethyl ethylenediamine and 185.4 parts of propylene oxide under the action of 7.6 parts of calcium oxide and calcium hydroxide mixtu...
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