柯克亚凝析油气田先导试验区循环注气开发

柯克亚凝析油气田西五一(3)凝析油气藏循环注气先导试验区从1994年9月2日开始注气,至1999年6月结束,累积注气382ｘ108ｍ3,累积采气3．47ｘ105ｍ3,注采比1．05,累积采凝析油6．83ｘ104ｔ．循环注气维持了地层能量,遏制了地下反凝析的进一步恶化,改善了地层的渗流能力,大大提高了凝析油的采收率。截止到1999年6月,凝析油采出程度达38．6％,比衰竭式开发的采收率提高17．6个百分点,开发效果良好。

Pilot Development of Kekeya Condensate Oil-Gas Field by Cyclic Gas Injection Process

On 2, September 1994, the cyclic gas injection began in pilot area of Xiwuyi-3 condensatereservoir, Kekeya condensate oil-gas field. As of June 1999, the cumulative gas injection amounted to 382xl06 m3, with cumulative gas production of 347xl06 m3, injection/production ratio of l.25, and cumulativecondensate oil production of 68.3xl03 t. By using this process, the formation pressure was maintained, insitu retrograde condensation was effectively restricted, percolation flow capacity was improved, thus greatlyincreasing the condensate oil recovery factor. By the end of June 1999, good result of 38.6% of its condensate oil recovery percent was obtained, with incremental recovery factor of 17.6% compared with thedepletion drive process.