葡北油田注气混相驱矿场试验开发技术研究

THE PILOT MISCIBLE GASFLOOD IN PUBEI OILFIELD

注气混相驱作为提高油田采收率的主体技术之一,近年来在国外发展迅猛,并取得了大量的实践经验,已发展成为一种成功的 EOR 方法。而我国在该技术领域尚处于矿场试验阶段。为了加快注气混相驱油田开发技术的现场应用研究,吐哈油田于1998年成功建立了葡北油田注气混相驱矿场试验基地。以葡北油田为例,系统阐述注气混相驱油田开发所涉及到的油藏条件筛选评价体系、油藏精细描述方法、注气混相驱关键指标确定、整体开发方案设计以及适合注气混相驱油田开发的主体工艺配套技术和矿场监测系统的建立。强调低渗透油田开展注气混相驱之前必须开展包括油藏精细描述、混相驱室内试验评价、混相驱数值模拟、经济评价、气源评价以及适合注气混相驱特殊要求的主体工艺配套技术等方面的综合研究。还针对葡北油田实际生产过程中所暴露的问题和油田开发效果进行详细的分析和评价。从而为我国在低渗透油田实施注气混相驱技术提高原油采收率奠定理论基础和提供现场实践经验。

A miscible gasflood pilot was built in Pubei oilfield in 1998.Taken it as an example,the reservoir condition selecting system,ways of fine reservoir description,the estimation of critical indices,the design of the overall de- veloping program,the main process matching techniques and the establishment of the monitoring system for miscible gasflood are described systematically.It is concluded that a comprehensive study including fine reservoir descrip- tion,miscible gasflood lab experiments and miscible gasflood numerical simulation must be done before it is used in a low permeability oilfield.Meanwhile,the problems occurred in the actual production and the effectiveness of mis- cible gasflood in Pubei oilfield are analyzed in detail,which can be reference for other miscible gasflood projects in our country.