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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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...

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

Image

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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Classification and recommendation of technical efficacy words

Improve stability
Not easy to precipitate

Agent delivering system comprised of microparticle and biodegradable gel with an improved releasing profile and methods of use thereof

InactiveUS6287588B1increase stabilityimprove stability

Owner:BTG INT LTD

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

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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