泡沫油油藏冷采后期注气吞吐开采实验

doi:10.7623/syxb201306014

石油学报 ›› 2013, Vol. 34 ›› Issue (6): 1143-1149.DOI: 10.7623/syxb201306014

泡沫油油藏冷采后期注气吞吐开采实验

孙晓飞¹, 张艳玉¹, 崔国亮¹, 李星民², 段学苇¹

1. 中国石油大学石油工程学院山东青岛 266580;
2. 中国石油勘探开发研究院北京 100083

收稿日期:2013-05-16 修回日期:2013-09-09 出版日期:2013-11-25 发布日期:2013-10-13
通讯作者: 孙晓飞
作者简介:孙晓飞，男，1984年1月生，2008年毕业于中国石油大学（华东），现为中国石油大学（华东）博士研究生，主要从事油气田开发工程相关研究。Email：sunxiaofei540361@163.com
基金资助:
国家重大科技专项（2011ZX05032-001）和中央高校基本科研业务费专项资金项目（11CX06022A）资助。

An experimental research on gas-injection huff and puff recovery after the cold heavy-oil production of foamy-oil reservoirs

SUN Xiaofei¹, ZHANG Yanyu¹, CUI Guoliang¹, LI Xingmin², DUAN Xuewei¹

1. College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China;
2. PetroChina Research Insititute of Petroleum Exploration & Development, Beijing 100083, China

Received:2013-05-16 Revised:2013-09-09 Online:2013-11-25 Published:2013-10-13

摘要/Abstract

摘要：

以脱气原油与活油为参照，利用非常规PVT实验方法开展了泡沫油溶气特性实验，揭示了泡沫油溶气特性，明确了天然气在泡沫油中的溶解能力以及地层压力对其溶解的影响规律，并通过岩心驱替实验研究了天然气吞吐提高采收率的可行性以及注气时机、注气轮次对泡沫油天然气吞吐开发效果的影响。泡沫油溶气特性实验表明，天然气溶解过程分为快速溶解、波动下降和稳定3个阶段。注气前期天然气溶解速度较大，累积溶气量增加迅速；天然气溶解能力随深度的增加逐渐减小，垂向上可形成一定的混相区域；增大地层压力有利于增加天然气溶解速度和累积溶气量；各压力下泡沫油溶气能力小于活油及脱气原油，但同一深度处其含气量最多，黏度最小。泡沫油天然气吞吐实验表明，天然气吞吐比冷采开发提高采收率7.8%，注气时机应在泡点压力与拟泡点压力之间，且焖井时间不宜过长，并应最大限度地提高地层压力。

关键词: 天然气, 吞吐, 泡沫油, 非常规实验, 溶气特性, 提高采收率

Abstract:

Taking degassed oil and active oil as a reference, an unconventional PVT experiment was carried to reveal features of gas dissolution in foamy oils and to define the dissolution capacity of natural gas in foamy oils and influential laws of formation pressure on gas dissolution. In addition, the feasibility of gas huff and puff development in enhancing oil recovery was evaluating by means of a core displacement experiment, and effects of gas-injection occasions and cycles on gas huff and puff development of foamy oils were also defined. The experimental results showed that the process of natural gas dissolution can be divided into three stages, i.e. rapid dissolution, fluctuation decline and stable stages. At the early stage of gas injection,the gas dissolution rate is relatively great and the volume of cumulative dissolved gas increases rapidly. The dissolution capacity of natural gas decreases gradually with depth increasing, which can form a certain vertical miscible area. An increase in formation pressure can increase the gas dissolution rate and volume of cumulative dissolved gas. The dissolution capacity of natural gas in foamy oils is smaller than that in active oil and degassed oil under different pressure, but the total gas volume in foamy oils is the highest and the viscosity of foamy oils is lowest at the same depth. Compared with cold production, gas huff and puff experiment demonstrated that gas huff and puff development for three cycles can increase the oil recovery by 7.8%. The gas injection occasion should be between bubble point pressure and quasi-bubble point pressure. Soaking time should not be too long, and the formation pressure be increased maximumly.

Key words: natural gas, huff and puff, foamy oil, unconventional experiment, characteristics of dissolved gas, enhanced oil recovery

中图分类号:

TE311

孙晓飞, 张艳玉, 崔国亮, 李星民, 段学苇. 泡沫油油藏冷采后期注气吞吐开采实验[J]. 石油学报, 2013, 34(6): 1143-1149.

SUN Xiaofei, ZHANG Yanyu, CUI Guoliang, LI Xingmin, DUAN Xuewei. An experimental research on gas-injection huff and puff recovery after the cold heavy-oil production of foamy-oil reservoirs[J]. ACTA PETROLEI SINICA, 2013, 34(6): 1143-1149.

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泡沫油油藏冷采后期注气吞吐开采实验

An experimental research on gas-injection huff and puff recovery after the cold heavy-oil production of foamy-oil reservoirs

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