海上“薄散弱”油藏有效开发实践

Effective Development Practice in Thin-Scattered-Weak Energy Offshore Oil Field

何贤科 蔡华 黄导武 刘江 宋春华

HE Xianke CAI Hua HUANG Daowu LIU Jiang SONG Chunhua

中海石油(中国)有限公司上海分公司, 上海 200030

Shanghai Branch of CNOOC Ltd., Shanghai 200030, China

薄散弱油藏由于其油层薄、砂体小、分布零散、天然能量弱,采用定向井难以经济有效开发;采用水平井开发虽可提高单井初期产量,但由于地层能量不足,产量递减快,无法从根本上解决采收率低的问题;注水开发虽能解决地层能量不足问题,但海上注水要增加设备、平台空间及平台重量,相应地增加开发成本,加上其储量规模小,经济效益难以保证。以X油田H4油藏为例,在储层精细描述的基础上,提出并实践了多底多分支水平井技术与地层自流注水技术,实现了"薄散弱"油藏的经济有效开发,并取得了较好的开发效果。其实践成果对类似难动用储量的经济有效开发具有借鉴和参考意义。

It is difficult to to develop economically thin-scattered-weak energy oil reservoirs with directional well because these kinds of oil reservoirs are thin in oil reservoir layers, small in sand bodies, scattered in distribution and weak in natural energy. The horizontal well can improve the single well production during the early period, but due to insufficient in formation energy, production declines significantly, and the problem of low oil recovery can not be solved fundamentally. Waterflood development can solve the problem of weak formation energy, but the development cost will increase, it is difficult to obtain good economic benefits by waterflood development due to the small scale of reserves. With H4 oil reservoir of X oil field as an example, multi-bottom and multi-branch horizontal wells and formation water back dumping technology have been discussed in this paper. On the basis of fine reservoir description, the thin-scattered-weak energy oil field has been develop effectively and economically with multi-bottom and multi-branch horizontal wells and formation water back dumping technology, and good development effect has been achieved. This technology can also be used in developing economicly and effectively the other similar oil fields with difficult procucing reserves.

https://doi.org/10.3969/j.issn.1008-2336.2014.03.072