摘要
塔河油田低品位油藏地质储量大,但存在前置液酸压改造单井产能低、水平井工具分段酸压工艺成本高等问题,不能满足此类油藏的经济开发。通过缝洞型碳酸盐岩储集层无工具暂堵分段酸压方法的应用,即采用转向酸和可降解纤维等材料在缝口形成阻挡层,迫使裂缝从下一段起裂沟通其他储集体,从而改变前置液酸压沟通单一缝洞模式,实现对单井多个储集层一次酸压全部高效动用。现场实施结果表明,采用水平井无工具分段酸压模式,可使单井平均单段酸压费用降低47.8%,单井产能提高至邻井的1.8倍,从而大幅提高了开发效益。
Abundant OOIP is discovered in the low-quality reservoirs of Tahe oilfield. But this kind of reservoirs can't be economically de-veloped because of low well productivity after preflush acid-fracturing and high cost of staged acid fracturing with tools in horizontal wells.Tool-free, temporary-plugging staged acid fracturing method is used in fracture-cave carbonate reservoirs, that is using steering acid and de-gradable fiber at fissure vents as barriers, which could force fracture initiation from the next section and then the reservoirs could be con-nected with each other. Thus the single fracture-cave pattern of preflush acid-fracturing is changed and several reservoirs in a single wellcan be produced effectively through one-time acid fracturing. Field application result shows that the average acid fracturing cost for a singlesection in one well can be reduced by 47.8% and well productivity can be increased to 1.8 times of that in neighboring wells. Consequently,the development benefit is significantly improved.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2016年第6期738-740,共3页
Xinjiang Petroleum Geology
基金
国家科技重大专项(2016ZX05053-014)
关键词
塔河油田
低品位油藏
碳酸盐岩油藏
水平井
无工具分段酸压
高效开发
Tahe oilfield
low quality reservoir
carbonate reservoir
horizontal well
tool-free staged acid fracturing
high-efficient development
