葡北油田混相驱矿场混相特征

Characteristics of Field by Gas Injection Miscible Flooding in Pubei Oilfield,Tur pan-Ha mi Basin.

葡北油田是我国第一个采用注天然气混相开采的油田,注气混相驱项目是国家九五攻关课题之一。1998年油田投入注气开发以来,目前全油田生产稳定,采油速度5.6%,采出程度15.74%,油田综合含水率为零,油田开发效果比较显著。对注气投产以来流体特征变化和数值模拟研究认为,目前注气区块达到了方案设计的混相要求,并认为注入气在地层中与原油是混相的。这将为西部油田特别是高气油比油田利用丰富的伴生气、采用注气混相驱开发有一定的借鉴意义。

Pubei oilfield is the first oilfield recovered by gas injection miscible process in China.The project of gas injection miscible flooding is one of the critical tasks proposed in'the Ninth Five-Year Plan'of the state.Since putting into production by gas injection process in1998,stable production has been maintained at present in the whole oilfield with recovery rate of5.6%,current recovery percent of15.74%and composite water cut of zero,achieving re-mark able results for development.This paper studied the variation of fluid property since gas-injection production and numerical simulation results,showing that current gas-injection blocks in this oilfield have reached requirements of the mis cible phase project design.It will provide significant guide for oilfields,especially for those having high gas-oil ratio in western China developed by abundant associated gas or gas-injection miscible phase process.