烯酯类驱油剂在致密油藏驱替开发中的研究
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1.中国石油大学北京非常规油气科学技术研究院;2.中国石油三次采油重点实验室低渗油田提高采收率应用基础理论研究室;3.教育部油田开发重点实验室

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Study on olefin ester oil displacement agents in the development of tight oil reservoirs
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    摘要:

    致密油藏驱替过程中存在注入压力高,采出程度低的问题。本文提出将烯酯类驱油剂运用到致密油藏驱替开发中。本文以9-癸稀酸甲酯为例通过致密岩心驱替实验,研究烯酯类驱替剂在致密岩心驱替过程中注入压力与驱油效果相对常规驱油剂的优势。9-癸稀酸甲酯不溶于水,能够与乙醇、乙醚、乙酸等有机溶剂互溶,在驱替过程中可以迅速传质扩散到岩心深处。研究结果表明:对于0.5mD级别的致密岩心,相对于常规驱油剂,9-癸稀酸甲酯驱替压力极大降低,不到水驱压力的1/30,适用于致密油藏的驱替开发。驱油剂的注入压力:去离子水>降租剂>纳米溶液>9-癸稀酸甲酯。同时驱替实验表明,先注入2PV9-癸稀酸甲酯再进行水驱,9-癸稀酸甲酯驱采出程度达到80%以上,综合采出程度达到90%以上。水驱后注入0.3PV、1.5PV9-癸稀酸甲酯段塞,提高采收率分别达到20.61%、57.52%。烯酯类驱油剂在致密油藏驱替开发应用中具有良好的注入适应性同时可以极大地提高采出程度,具有广阔的应用前景。

    Abstract:

    There are problems of high injection pressure and low recovery in the process of tight oil reservoir displacement. This paper proposes to apply olefin ester oil displacement agents to the displacement development of tight oil reservoirs. In this paper, taking 9-decene acid methyl ester as an example, through tight core flooding experiments, the advantages of the injection pressure and oil displacement effect of olefin ester flooding agents over conventional oil flooding agents in the process of tight core flooding are studied. Methyl 9-decenate is insoluble in water and can be miscible with organic solvents such as ethanol, ether, acetic acid, etc., and can rapidly transfer mass to the depth of the core during the displacement process. The research results show that for the 0.5mD tight core, the displacement pressure of methyl 9-decanoate is greatly reduced compared to conventional oil displacement agents, which is less than 1/30 of the water flooding pressure, which is suitable for the flooding of tight oil reservoirs. For development. Injection pressure of oil-displacing agent: deionized water> rent reducer> nano solution> 9-decene methyl ester. At the same time, the flooding experiment showed that, by injecting 2PV9-decanoate methyl ester first and then water flooding, the recovery degree of 9-decanoate methyl ester flooding reached more than 80%, and the comprehensive recovery degree reached more than 90%. After water flooding, 0.3PV and 1.5PV9-methyl decanoate slugs were injected to increase oil recovery to 20.61% and 57.52% respectively. Ester oil-displacing agents have good injection adaptability in the development and application of tight oil reservoirs, and at the same time can greatly improve the degree of recovery, and have broad application prospects.

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  • 收稿日期:2020-09-07
  • 最后修改日期:2020-10-12
  • 录用日期:2020-11-06
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