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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI 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 reduction rate can reach more than 95%, but most of the viscosity reduction will increase the difficulty of demulsification or the incompatibility of demulsifiers

Method used

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  • Composite chemical oil displacement agent for tertiary oil recovery in oil field

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Experimental program
Comparison scheme
Effect test

Embodiment 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.

Embodiment 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.

Embodiment 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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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.

Description

1. Technical Field [0001] The invention relates to a compound chemical oil displacement agent for tertiary oil recovery in an oil field. 2. Technical background [0002] As the oilfields in eastern my country have entered a high water-cut period, in order to control water and stabilize oil, new tertiary oil recovery technologies represented by chemical flooding such as surfactant active water flooding, polymer flooding, and binary combination flooding have been widely promoted and applied as chemical products. The amount of surfactants used in oil-displacing agents will increase day by day. In accordance with the development of Shengli and domestic oilfields and the needs of tertiary oil recovery, the application of surfactants will be greatly increased to ensure that my country's petroleum industry will continue to stabilize and increase production in the next few years, which will play an important role in the development of the national economy. At present, the main types of s...

Claims

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Application Information

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IPC IPC(8): C09K8/584E21B43/22
Inventor 韩霞黄建滨张建王建华祝威王田丽管善峰黄少伟
Owner SINOPEC PETROLEUM ENG DESIGN
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