对提高复杂气田开发效益和水平的思考与建议

Thoughts and suggestions for the improvement of the efficiency and development level of complex gas fields

水驱气田和凝析气田属复杂气田,其开发难度很大,需认真对待。结合多年理论研究和实践经验,指出了凝析气田开发当前应注意10个问题,即:合格凝析油气样品的取得;相态研究要深入到多孔介质相态、水—凝析油气相态、注干气再蒸发地层凝析油相态和开发中后期的相态研究;凝析气田开发方式和开发后期提高凝析油采收率问题;要慎重对待凝析气田注水问题,等等。针对水驱气田,指出一定要处理好采气速度与最终采收率的关系,应重温四川水驱气藏防、治水经验,管好见水气井,增强法律意识。其结论和认识对复杂气田的高效开发具有重要的指导意义。

Great challenges are faced by the development of complex gas fields such as water-drive gas and gas condensate fields.In combination with theoretical studies and practical experiences in the recent years,ten problems facing the development in the gas condensate fields are first pointed out.For example,(1) how to obtain the samples of eligible gas condensate;(2) the studies of phase state should focus on porous media,water-gas condensate,oil condensate in the formation after dry gas injection,and gas condensate at the middle-late stage of development;(3) what is the proper way of the development and how to enhance the recovery of condensate gas at the late stage of development;and(4) how to seriously deal with the problem of water injection in gas condensate fields.In view of water-drive gas fields,it is pointed out that the relationship between the gas recovery rate and the ultimate recovery factor must be well handled.Moreover,the past experiences in water proof,water control of water-drive Sichuan gas fields should be reviewed to help manage the water invasion and the operator's legal sense should be improved.This study provides guidance for the high-efficiency development of complex gas fields.