火山岩油藏注采动态特征研究

火山岩油藏无论在国内或国外,其数量与规模都既少又小。我国的火山岩油藏主要分布在新疆,这些油藏注水开发已有数年,其动态特征表现为:油井产能高低悬殊;油井及油田产量递减均快、油藏无稳产期;注水井吸水差别大;注水开发时少数油井水窜水淹严重、而多数油井长期不见注水效果;油藏采收率多在8%~13%之间。上述注采特征与油藏裂缝发育、非均质性极强的地质特点是相一致的。根据上述特点,建议火山岩油藏的开发应慎重注水,重点做好高产井管理,水窜严重的井组采取停注或间注等方式进行开采。

STUDY OF THE PERFORMANCE CHARACTERISTICS OF INJECTION AND PRODUCTION ON IGNEOUS-ROCK RESERVOIRS

Igneous-rock reservoirs in China are mainly distributed in XinJiang, where they have been under water injection recovery for several years. Performance data show that these reservoirs are characterized by: great variation in productivity among oil wells, quick decline of producing ability for both oil wells and oilfield, non-existence of a stable production period, and marked difference in absorption capacity among injection wells. Furthermore, during injection production, a few producing wells would experience severe water channeling or be quickly flooded out while most other wells would not witness injection effect for a long time. And the oil recovery is typically around 813%. Allthese are consistent with the geological character of well-developed fractures and strong heterogeneity of the reservoirs. In accordance with such characteristics, it is strongly suggested that in the development of these reservoirs water injection be carefully planned, more attention be given to the management of the high-production wells, and water injection into the wellgroups experiencing severe water channeling be terminated or kept at interval.