“油气人工运移”方法论证——海上边际油气藏开发技术探索

Hydrocarbon artificial migration:a novel development technology for offshore marginal reservoir

海上油气田现有开发模式投资成本高昂,很大一部分储量规模小、分布分散、异常高压、高含CO2等边际油气藏难以经济有效开发。探索性提出了"油气人工运移"方法,即通过建立人造运移通道,使边际油气藏油气流体运移汇集到已开发的油气藏优质储层,充分利用现有的井网及平台设施,实现对边际油气藏间接动用开发,从而达到大幅度降低开发成本、经济有效动用边际油气藏储量的目的。文中利用等值渗流阻力分析、节点系统分析及油藏数值模拟等方法计算了油气运移流量,论证了"油气人工运移"的可行性;分析了方法适用的油气藏类型和降低开发成本的优势。

A large part of marginal reservoirs with such characteristics as small-scale reserves, scattered dis- tribution, abnormal overpressure and high CO2 content are difficult to be developed effectively and eco- nomically under the current offshore oil and gas fields development methods because of the high cost. A method named artificial hydrocarbon migration was put forward in which the oil or gas migrates from marginal reservoir to another developed high quality reservoir through artificial migration channel, and the in- direct development of marginal reservoir was achieved by fully utilizing the existing wells and platforms, thus significantly reducing the development cost and effectively developing the marginal reservoir reserves. Hydrocarbon migration flow was analyzed by equivalent flow resistance analysis, node analysis and reser- voir numerical simulation methods, which demonstrated the feasibility of artificial hydrocarbon migration. The suitable reservoir types and the advantages of development cost reduction were also analyzed.