氮气吞吐式次生气顶形成条件及其影响因素
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崔传智(1970—),男,山东青州人,教授,博导,从事油气渗流理论、油气田开发技术方面的研究与教学工作。联系电话:13705469592,E-mail:ccz2008@126.com。

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国家科技重大专项“平面分区均衡动用主控因素及优化调控方法研究”(2016ZX05011002-003)


Formation conditions and influencing factors of secondary gas cap under nitrogen huff and puff technique
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    摘要:

    复杂断块油藏是中国重要的油气资源类型之一,具有构造复杂、含油面积小和地层倾角大等特点,难以形成完善的注采井网结构,构造顶部滞留的“阁楼油”挖潜难度较大。吞吐式次生气顶驱技术作为一种能够有效保持地层能量、改善驱油效率的方法,提出并应用于该类型油藏的开发过程中。针对复杂断块油藏的典型特征,分析吞吐方式下次生气顶驱的作用机理,结合油藏工程方法与油藏数值模拟技术,确定次生气顶的形成条件及其影响因素,研究氮气吞吐过程中次生气顶的形成阶段。结果表明:氮气吞吐开发过程中,当复杂断块油藏中的气顶指数大于或等于0.5时,即可形成具备一定驱动能量的次生气顶;地层原油溶解气油比较低、地层压力较小且累积注气量和产油量较大的复杂断块油藏更有利于次生气顶的发育成形。

    Abstract:

    Complex faulted block reservoir is one of the important hydrocarbon resources in China,and it has the characteristics of complex structure,small oil-bearing area and large strata dip. It is difficult to form a perfect injection-production pattern and to produce“attic oil”at the top of the reservoir. As a method for effectively maintaining formation energy and improving displacement efficiency,secondary gas cap drive under huff and puff technique has been proposed and applied to the development of the complex faulted block reservoir. Based on the typical characteristics of the reservoir,the mechanism of the secondary gas cap drive under huff and puff is analyzed,the formation conditions and influencing factors of the secondary gas cap are determined combined with the reservoir engineering method and reservoir numerical simulation,and the forming stage of the secondary gas cap during the nitrogen huff and puff process is studied. The results show that when the gas cap index is greater than or equal to 0.5 during nitrogen huff and puff process in the complex faulted block reservoir,the secondary gas cap with a certain driving energy can be formed. The lower dissolved gas/oil ratio,the lower formation pressure and the larger cumulative gas injection and oil production are more conducive to the development and formation of the secondary gas cap.

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崔传智,曾昕,杨勇,杨紫辰.氮气吞吐式次生气顶形成条件及其影响因素[J].油气地质与采收率,2019,26(5):96~101

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  • 在线发布日期: 2019-10-29