鄯善油田特高含水期CO2吞吐增油与埋存试验

doi:10.7657/XJPG20230309

摘要/Abstract

摘要：

根据鄯善油田注CO₂吞吐井组先导试验，分析低渗透低黏度油田特高含水期开展CO₂驱油与埋存的注采特征及影响因素。结果表明，鄯善油田发育中—深层油藏，CO₂注入呈超临界状态，注入特征与注水类似，存在剖面动用不均和平面突进问题；CO₂吞吐生产具有“气态CO₂排出阶段、增油生产阶段、逐步失效阶段”的三段式开采特征；3口吞吐井换油率差异较大，增油效果主要受地下剩余油富集程度影响；CO₂主要埋存机理为溶解作用和矿化作用，同步埋存率高达95.6%。

关键词: 鄯善油田, 特高含水期, CO₂吞吐, CO₂驱油, 埋存, 换油率, 埋存率, 作用机制, 经济效益

Abstract:

Based on the pilot test of the CO₂ huff-n-puff well group in the Shanshan oilfield, the injection-production performance and the factors influencing CO₂ EOR and storage in high water cut stage in low-permeability and low-viscosity oilfields were analyzed. The results show that, in the Shanshan oilfield (medium-deep burial reservoirs), the injected CO₂ stays in a supercritical state, and the characteristics of CO₂ injection are similar to those of water injection, showing the problems of uneven vertical sweep and planar breakthrough. The CO₂ huff-n-puff can be divided into three stages: transient gas flowback, oil enhancement, and gradual invalidation. Three huff-n-puff wells vary greatly in oil replacement rate, indicating that the EOR effect mainly affected by the degree of remaining oil enrichment. The main mechanisms of CO₂ storage are dissolution and mineralization, and the simultaneous storage rate can reach as high as 95.6%.

Key words: Shanshan oilfield, extra-high water cut stage, CO₂ huff-n-puff, CO₂ EOR, storage, oil displacement rate, storage rate, mechanism, economic benefit

中图分类号:

TE341

李艳明, 刘静, 张棚, 公学成, 马建红. 鄯善油田特高含水期CO₂吞吐增油与埋存试验[J]. 新疆石油地质, 2023, 44(3): 327-333.

LI Yanming, LIU Jing, ZHANG Peng, GONG Xuecheng, MA Jianhong. CO₂ Huff-n-Puff and Storage Test in Extra-High Water Cut Stage in Shanshan Oilfield[J]. Xinjiang Petroleum Geology, 2023, 44(3): 327-333.

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鄯善油田特高含水期CO₂吞吐增油与埋存试验

CO₂ Huff-n-Puff and Storage Test in Extra-High Water Cut Stage in Shanshan Oilfield

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