Composite chemical oil displacement agent for tertiary oil recovery in oil field
A technology for chemical flooding and compound flooding, which is applied in chemical instruments and methods, production fluids, earthwork drilling, etc. Effect
Inactive Publication Date: 2011-08-24
SINOPEC PETROLEUM ENG DESIGN
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Abstract
The invention provides a composite chemical oil displacement agent for tertiary oil recovery in an oil field. The oil displacement agent comprises an anion surfactant, a cation surfactant and a nonionic surfactant. The oil displacement agent is characterized in that the cation surfactant consists of branched chain alkyl quaternary ammonium salt and chlorine ions or bromine ions; the anion surfactant is hybridized sulfonate or sulfate or carboxylate with multiple ethylene oxide (EO) groups; the nonionic surfactant is a surfactant with a branched chain hydrophobic group and an EO group; and the raw materials are evenly stirred in a kettle so as to obtain the composite oil displacement agent. Through formation of zwitterion pairs, the composite displacement agent can form a compact interface absorption film, and the stability of the composite displacement agent is improved because a non-ionic surfactant is added, so that the composite displacement agent is not easy to precipitate.
Application Domain
Fluid removalDrilling composition
Technology Topic
BromineIon +13
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