Oil displacement method to reduce adsorption loss
An oil-displacement method and oil-displacement technology, which are applied in chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve problems such as the decline in oil displacement efficiency of the oil displacement system, and achieve reduction of adsorption, elimination of adsorption, The effect of reducing usage
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Embodiment 1
[0047] (1) Preparation of surfactant S01
[0048] (a) Gemini cationic quaternary ammonium salt surfactant (10-6-10,2Cl - )
[0049] Mix 213.0 grams (1 mole) of decyldiethyl tertiary amine with 77.5 grams (0.5 moles) of 1,6-dichlorohexane and 600 grams of isopropanol in a 2000-milliliter vessel equipped with a mechanical stirrer, a thermometer and a reflux condenser. In the four-neck flask, be heated to reflux reaction 60 hours, stop reflux. Evaporate isopropanol, take a sample and titrate with sodium tetraphenylborate standard solution, Gemini cationic surfactant (10-6-10, 2Cl - ) content was 96.5%, and the rest of the samples were left untreated and set aside.
[0050] (b) Preparation of anion and compound surfactant S01
[0051]①Add 276 grams (1 mole) of dodecylbenzyl alcohol and 4.6 grams of potassium hydroxide to a 2L pressure reactor equipped with a stirring device, and when heated to 80-90°C, turn on the vacuum system and dehydrate under high vacuum After 1 hour, re...
Embodiment 2
[0055] (1) Surfactant S02
[0056] (a) The cationic surfactant is dodecyl dimethyl benzyl ammonium chloride, commercially available, with a content of 45%, and the solvent is water.
[0057] (b) Preparation of anion and composite surfactant S03
[0058] where R=iso-C 13 h 27 .
[0059] ①Add 200 grams (1 mole) of isotridecyl alcohol, 4 grams of potassium hydroxide and 2.6 grams of anhydrous potassium carbonate to the pressure reactor equipped with a stirring device, and when the reaction temperature is 80-90 ° C, turn on the vacuum system , dehydrated under high vacuum for 1 hour, then replaced with nitrogen for 3 to 4 times, adjusted the reaction temperature of the system to 150°C and slowly introduced 701.8 grams (12.1 moles) of propylene oxide, and controlled the pressure ≤ 0.50MPa. After the reaction, the temperature was lowered, and 88.0 g (2.0 moles) of ethylene oxide was slowly introduced at 130° C. to control the pressure to ≤0.60 MPa. After the reaction was finish...
Embodiment 3
[0063] (1) Surfactant S03
[0064] Add sodium laurate and dodecyltrimethylammonium chloride into the reaction flask at a molar ratio of 15:1, use 10wt% isopropanol aqueous solution as the solvent, heat up to 80°C and stir for 2 hours until completely dissolved, then distill under reduced pressure The isopropanol was removed to obtain the desired anion-cation system surfactant, wherein the total surfactant content was 40.8% by mass percent.
[0065] (2) The aqueous solution of the surfactant containing adsorption inhibitor was prepared respectively with 0.5wt% NaCl simulated brine, and the adsorption experiment was carried out with [Example 1] (2), and the results are shown in Table 3. Among them, the adsorption temperature is 83°C.
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