注气混相驱中水气切换问题实验研究  

EXPERIMENTAL STUDY ON WATER/GAS SWITCH OVER IN MISCIBLE FLOODING OF GAS INJECTION

作　　者：彭远进[1] 刘建仪[1] 王仲林 孙玉凯 杨凯雷 刘滨 

机构地区：[1]西南石油学院"油气藏地质及开发工程"国家重点实验室 [2]中国石油吐哈油田分公司

出　　处：《天然气工业》2005年第9期86-88,共3页Natural Gas Industry

摘　　要：葡北油田注气混相驱开发已取得了较好的效果,但该油田在水气交替注入过程中出现了水气切换问题,注水井转注气时气体注不进地层,导致油田水气切换方案无法正常实施。文章利用长岩心驱替实验研究产生此问题的机理和原因,表明在现场确定压缩机及其压力时,应考虑最高水气交替注入压力及压力上升的影响,避免频繁的水气交替;在注气开始时就应进行示踪剂监测,葡北油田实施较晚,没有起到监测的作用;不论是水驱还是水气交替,都存在初始启动压差,要考虑增大注入压力以启动注气工程。Good development results have been achieved by miscible flooding of gas injection in Pubei oilfield. But the problem of water/gas switch over appears in the process of water/gas alternating injection. Gas can't be injected into the reservoir when the water injection well is alternated into gas injection well, which makes the program of water/gas switch over can't be performed normally. With long core displacement experiments, the mechanism and reasons causing the problem are studied. The results show the effect of the highest water/gas alternating injection pressure and pressure upping should be considered when the field compressor and its pressure are selected. And frequent water/gas alternating injection should be avoided. The tracer monitor should be conducted at very beginning of gas injection. The tracer monitor is too late to work in Pubei oilfield. There is initial start pressure difference whatever for water flooding or water/gas alternating displacement. So, increasing injection pressure should be done to start gas injection.

关 键 词：混相驱 注水 注气 交替注入 注入压力 启动压力 水气交替注入 注气混相驱 切换方案 驱替实验 

分 类 号：TE357.7[石油与天然气工程—油气田开发工程]