Application of surfactant and formulation system thereof in alkali-free binary combination flooding
A surfactant and oil displacement technology, applied in chemical compound oil displacement agent, chemical compound oil displacement agent in the application field of oil recovery, can solve the problems of unstable nature, complex composition of surfactant, formation damage, etc. Single, overcoming formation damage and scaling, high mineralization resistance
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Embodiment 1
[0040] Preparation of alkyl aryl surfactant 1:
[0041]Add 2 mol of linear dodecene into the reaction kettle, at 130~250℃, anhydrous AlCl 3 Under catalyst action, stir, dropwise add hydrogen chloride solution, obtain 325g chlorododecyl;
[0042] Add 2mol aniline in the reaction kettle again, stir, in catalyst anhydrous AlCl 3 Under the effect, 325g of chlorinated dodecyl chlorides were added dropwise, and reacted at 50°C to generate 334g of p-dodecylaniline;
[0043] Get the prepared 334g p-dodecylaniline and join in the reactor, stir, in catalyst AlCl 3 Under the action, when the temperature is 60°C, drop 1.5mol of dichlorobutane to obtain 351g of p-dodecylaniline butyl chloride, then add sufficient amount of ammonia water, and ammonolysis above 200°C to obtain 332g of p-dodecane phenylaniline butyl primary amine;
[0044] Then take the prepared 332g p-dodecylaniline butyl primary amine in the reaction kettle, add 1.2mol 1-chloro-2-hydroxypropyl sodium sulfonate, heat up ...
Embodiment 2
[0052] Alkali-free binary composite oil displacement agent was prepared by using the prepared alkyl aryl surfactant.
[0053] (1) The reagents used in the experiment are: the alkylaryl surfactant provided by the present invention; the water-soluble anionic polyacrylamide produced by SNF Company; the injection water of Jinzhou block; the dehydrated crude oil of Jinzhou block.
[0054] The test instrument is: TX500C rotating interfacial tensiometer.
[0055] (2) Preparation of non-alkali binary composite oil displacement agent: take weight percent respectively as 0.1% alkylaryl surfactant 1 and alkylaryl surfactant 2, and weight percent as 0.12% water-soluble anion Polyacrylamide and the rest of water are mixed and stirred for 30 minutes to obtain a binary composite oil displacement agent. The main performance index of the prepared binary composite oil displacement agent is detected, and the test method is known to those skilled in the art, and the results are shown in Table 1:...
Embodiment 3
[0061] (1) The binary composite oil displacement agent was prepared by using water-soluble anionic polyacrylamide, alkylaryl surfactant 1 with different composition ratios and the same water. S represents the alkylaryl surfactant 1 provided by the present invention, P represents the water-soluble anionic polyacrylamide, expressed in weight percentage, and the components are as follows: S0.05%+P0.12%, S0.10%+ P0.12%, S0.15%+P0.12%, S0.20%+P0.12%, S0.25%+P0.12%. Please refer to figure 2 , figure 2 It is the interfacial tension curve diagram of five kinds of binary composite oil displacement agents provided by the present invention under the condition of 57°C. It can be seen from the figure that the interfacial tension formed by the five kinds of binary composite oil displacement agents can reach 10 after 2 hours of equilibrium. -3 ~10 -4 mN / m or less, and as the content of alkylaryl surfactant 1 increases, the interfacial tension becomes smaller.
[0062] (2) With 4 parts ...
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Abstract
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