Surfactant compounded system with oil reservoir adaptability

A surfactant and reservoir adaptability technology, applied in the field of surfactant ternary system preparation, can solve the problems of difficult to obtain oil displacement agent, complex composition of crude oil, large composition changes, etc., and achieve the reduction of oil-water interfacial tension, universal Oil phase compatibility, loss reduction effect

Inactive Publication Date: 2015-06-10
QINGDAO HUICHENG PETROCHEM TECH
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Problems solved by technology

[0005] Due to the complex composition of crude oil and large changes in composition, it is not only a lot of work to screen oil displacement agents according to reservoir conditions, but it is often difficult to obtain oil displacement agents with reservoir adaptability. Every time a block is replaced, oil displacement agents need to be rescreened The formulation has become a difficult problem restricting the development of chemical flooding to enhance oil recovery

Method used

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  • Surfactant compounded system with oil reservoir adaptability
  • Surfactant compounded system with oil reservoir adaptability
  • Surfactant compounded system with oil reservoir adaptability

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Embodiment 1

[0025] Composition of compound oil displacement agent: A, fatty amine polyoxyethylene ether, B, petroleum sulfonate, C, cetyltrimethylammonium bromide.

[0026] In 20000ppm formation water, add A and B at a ratio of 1:1, stir and mix evenly, and then slowly add C dropwise, so that the specific ratio of the three is 4:4:2, and the total concentration of the three is 0.3%. Adjust the TEXAS-500 spinning drop interfacial tensiometer to 40°C, put the sample tube filled with the above solution into it, and after it has stabilized for half an hour, add about 1 microliter of crude oil from Shengli Oilfield with a micro-syringe, at a speed of 6000 rpm , read the interfacial tension at regular intervals, see the interfacial tension curve figure 1 shown.

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Abstract

The invention relates to a surfactant compounded system with oil reservoir adaptability. The surfactant compounded system consists of nonionic surfactants A, anionic surfactants B and cationic surfactants C. An oil displacement agent related by the invention has the advantages that the Shengli oil field crude oil/water interface tension can be reduced to an ultra-low state in a short time, in addition, certain oil phase adaptability is realized, an important effect is achieved in the aspect of improving the crude oil yield, secondly, the use concentration of the surfactant of the system is low, the salt resistance is good, and the applicability to stratum mineralized water is good.

Description

field of invention [0001] The invention relates to the preparation of a surfactant ternary system with oil reservoir adaptability, and belongs to the technical field of oil field chemistry. Background technique [0002] As a strategic resource, oil plays an important role in its effective exploitation and utilization. Since oil is a non-renewable resource, with the continuous improvement of productivity, the society's demand for oil has risen sharply, and the chance of rediscovering large reserves of oil reservoirs has decreased, so that the improvement of the recovery rate of developed oil fields has attracted much attention, and technical means have been adopted Enhanced oil recovery has become a necessary production measure with great potential. Many years of research have proposed a variety of enhanced oil recovery technologies, among which chemical methods such as polymer flooding, alkaline water flooding, surfactant flooding, and alkali / surfactant / polymer composite fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 张森张贵昕崔会会
Owner QINGDAO HUICHENG PETROCHEM TECH
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