Composite oil displacing agent

An oil and compound technology, applied in the field of oil displacement agent, can solve the problem of high cost and achieve the effects of cost reduction, viscosity protection and damage reduction

Active Publication Date: 2014-10-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ASP flooding system uses about 0.3% surfactant, the polymer concentration is basically the same as polymer floodin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0083] Compound flooding oil displacement agent preparation, first add 0.3 part of sodium alkylbenzene sulfonate (DQB) + 0.3 part of biological compound + 0.8 part of NaOH + 0.4 part of Na 3 PO 4 +0.15 parts of polymer (KY-2) made up to 100 parts with injection water. After stirring evenly, the adsorption capacity measurement results: figure 1 , after adding biological compound (SWX) to the oil displacement agent, the adsorption amount of surfactant (DQB) is reduced by more than 30%; figure 2 , After sodium phosphate was added to the oil displacement agent, the adsorption amount of surfactant (DQB) decreased by about 20%, and the adsorption amount was 1.3mg / g oil sand, which decreased by 30%. Oil displacement agent and crude oil interfacial tension measurement see image 3 and Figure 4 , the interfacial tension of biological complex (SWX) is significantly higher than that of surfactant (DQB), indicating that the former has a certain interface activity; 10 -3 Below the o...

example 2

[0088] Compound flooding oil displacement agent preparation, first add 0.1 part of sodium alkylbenzene sulfonate (DQB) + 0.2 part of biological compound + 0.6 part of NaOH + 0.3 part of Na 3 PO 4 +0.1 part of polymer (KY-2) is replenished to 100 parts with injection water, after stirring evenly. After adding biological compound (SWX) and sodium phosphate to the oil displacement agent, the adsorption amount of surfactant (DQB) decreased by about 50%; the interfacial tension between the oil displacement agent and crude oil was 5.2×10 -3 mN / m. The viscosity of the oil displacement agent system is 26.4mPa.s. According to the results of the oil displacement experiment, the oil recovery rate is increased by 18.1%.

example 3

[0090] Composite oil displacement agent preparation, first add 0.4 part of sodium alkylbenzene sulfonate (DQB) + 0.4 part of biological compound + 1.0 part of NaOH + 0.4 part of Na 3 PO 4 + 0.15 parts of polymer (KY-2) was added to 100 parts with injected water, after stirring evenly. After adding biological compound (SWX) and sodium phosphate to the oil displacement agent, the adsorption amount of surfactant (DQB) decreased by about 35%; the interfacial tension between the oil displacement agent and crude oil was 4.5×10 -3 mN / m. The viscosity of the oil displacement agent system is 32.1mPa.s. According to the results of the oil displacement experiment, the oil recovery rate is increased by 21.8%.

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Abstract

The invention relates to a composite oil displacing agent, which is composed of sodium alkyl benzene sulfonate, a bio-compound, NaOH, Na3PO4, polymer and injected water. An organic bio-compound (a rhamnose ester mixture), which is cheaper than the surfactant, is added into the composite system to use as a sacrificial agent. The bio-compound will carry out competition adsorption against the surfactants on the rock surface, thus the adsorption of surfactants on the rock surface will be decreased, and the utilization rate of surfactants with a higher price is increased. At the same time, a synergetic effect is generated between the bio-compound and the surfactants, and the interface activity of the composite system is increased. The using amount of strong alkali (NaOH) is reduced by utilizing the dual effect of reducing the interface tensile of sodium phosphate after the interface adsorption of the sacrificial agent.

Description

technical field [0001] The invention relates to an oil-displacing agent in chemical flooding, which is a composite oil-displacing agent suitable for the middle and late stages of oil field development. Background technique [0002] Polymer flooding technology has been applied industrially in major onshore oilfields in China, and the enhanced oil recovery rate is about 10%. Because polymer flooding is mainly to expand the swept volume, improve the efficiency of microscopic oil displacement, and accelerate the oil recovery rate. The composite flooding technology can make up for the shortage of polymer flooding, further improve the oil displacement efficiency, reduce the remaining oil content in the reservoir, and increase the oil recovery rate of crude oil to about 18%. [0003] There are still many problems to be solved in the ASP flooding system, such as the development of multifunctional surfactants, reducing the dosage of each component in the composite system, etc. The ...

Claims

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Application Information

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IPC IPC(8): C09K8/58C09K8/584
CPCC09K8/58C09K8/584
Inventor 李道山徐国安张景春伍星滕钟杰王正海李昭程丽晶
Owner PETROCHINA CO LTD
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