缝洞型碳酸盐岩油藏注气吞吐EOR效果评价

发布时间：2018-01-29 13:59

本文关键词： 缝洞型稠油油藏注气吞吐吞吐物理模型二氧化碳氮气提高采收率　出处：《西南石油大学学报(自然科学版)》2017年01期 　论文类型：期刊论文

【摘要】：缝洞型碳酸盐岩稠油油藏以大型溶洞、溶蚀孔洞及裂缝为主要储集空间,非均质性极强,针对此类油藏,注气吞吐是一种有效的开发方式。为了探索缝洞型碳酸盐岩油藏注气吞吐开发效果,设计并制作了适用于缝洞型油藏吞吐室内物理模拟实验装置,从换油率、产气速率、产气量等方面对比分析了4种吞吐介质(CO_2、N_2、先注CO_2后注N_2、先注N_2后注CO_2)的吞吐效果,分析了作用机理。实验结果表明:注气吞吐提高采收率效果显著,最低换油率的N_2吞吐也能达到0.422;CO_2与N_2混合气吞吐中,CO_2溶于原油中能使其黏度降低,N_2由于重力分异作用占据缝洞高部位形成气顶,这种协同作用使得CO_2与N_2混合气吞吐效果好于单一注气吞吐;而在注气顺序上先注N_2后注CO_2吞吐效果更加明显,换油率可达0.861。缝洞型油藏注气吞吐开采是一种行之有效提高采收率的方法,先注N_2后注CO_2混合气吞吐可获得更显著的开发效果。
[Abstract]:The fractured and cavernous carbonate heavy oil reservoirs are mainly composed of large caverns, dissolved pores and fractures, and have strong heterogeneity, aiming at this kind of reservoirs. Gas injection huff and puff is an effective development method. In order to explore the development effect of gas injection huff and puff in fractured carbonate reservoir, a laboratory physical simulation device suitable for fracturing and cavern reservoir huff and puff is designed and manufactured, from which the oil exchange rate can be obtained. In the aspects of gas production rate and gas production rate, the huff and puff effect of four kinds of huff and puff medium, CO_2 and then Ns _ 2 and N _ 2, respectively, were compared and analyzed. The experimental results show that the effect of gas injection on oil recovery is remarkable, and the lowest oil exchange rate can reach 0.422; Dissolved in crude oil in CO_2 and N-2 mixture gas huff and puff, the viscosity can be reduced. Due to gravity differentiation, the gas cap is formed in the high part of the fissure and cavern. This synergistic effect makes the mixture of CO_2 and N-2 have better huff and puff effect than that of single gas injection. In the sequence of gas injection, the effect of injecting NSP 2 and CO_2 is more obvious, and the oil exchange rate can reach 0.861. Gas injection and puff production is an effective method to improve oil recovery. A more significant development effect can be obtained by injecting N-2 and CO_2 mixture gas huff and puff.
【作者单位】：中国石油大学(北京)提高采收率研究院;中国石油三次采油重点实验室;中国石油大学(北京)石油工程教育部重点实验室;中国石化海相油气藏开发重点实验室;
【基金】：国家科技重大专项(2011ZX05014-003) 国家重点基础研究发展计划(“973”计划)(2011CB201006)
【分类号】：TE357.7
【正文快照】： 苏伟,侯吉瑞,刘娟,等.缝洞型碳酸盐岩油藏注气吞吐EOR效果评价[J].西南石油大学学报(自然科学版),2017,39(1):133 139.SU Wei,HOU Jirui,LIU Juan,et al.Evaluation of EOR Effect of Gas Huff-n-puff in Fractured Vuggy Carbonate Reservoirs[J].Journal of SouthwestPetrol

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