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
2 Cites 39 Cited by

AI-Extracted Technical Summary

Problems solved by technology

Viscosity reducers currently used in the emulsification viscosity reduction method are mainly anionic and nonionic surfactants, and the viscosity reductio...
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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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  • Composite chemical oil displacement agent for tertiary oil recovery in oil field

Examples

  • Experimental program(3)

Example Embodiment

[0011] Example 1:
[0012] For the Gudao oilfield block of Shengli Oilfield, the composite oil displacement agent is made into a 0.3% solution with Gusilian external water delivery. The resulting solution can reduce the oil-water interfacial tension of Gudao crude oil to 0.001-0.0002mN/m, achieving ultra-low interface Tension requirements. The solution was mixed with quartz sand according to the solid-liquid ratio of 1:3, and after 24 hours of stirring and adsorption, the oil-water interfacial tension of Gudao crude oil could still be reduced to 0.003-0.0008mN/m. It can continue to be used for flooding in the actual system.

Example Embodiment

[0013] Example 2:
[0014] For the Shengxiu Oilfield block of Shengli Oilfield, the composite oil displacement agent is prepared with Tuo Liulai water as a 0.3wt% solution. The resulting solution can reduce the oil-water interfacial tension of Shengxiu crude oil to 0.005mN/m, achieving ultra-low interfacial tension Requirements. The solution was mixed with quartz sand according to a solid-liquid ratio of 1:3, and after stirring and adsorbing for 24 hours, the oil-water interfacial tension of Shengsheng crude oil could still be reduced to 0.005mN/m. It can continue to be used for flooding in the actual system.

Example Embodiment

[0015] Example 3:
[0016] For the Gudong oilfield block of Shengli Oilfield, the composite oil displacement agent is prepared with Dongsanlai water as a 0.3wt% solution. The resulting solution can reduce the oil-water interfacial tension of Gudong crude oil to 0.005-0.002mN/m, reaching ultra-low Interfacial tension requirements. The solution was mixed with quartz sand according to the solid-liquid ratio of 1:3, and after 24 hours of stirring and adsorption, the oil-water interfacial tension of Gudong crude oil could still be reduced to 0.01-0.006mN/m. It can continue to be used for flooding in the actual system.

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Description & Claims & Application Information

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