厚层块状稠油油藏平面火驱技术研究与实践

Technical research and practice of areal fire flooding for thick-massive heavy oil reservoirs

辽河油田G块为特深层、厚层块状普通稠油油藏,历经23a的蒸汽吞吐开发,已经进入开发后期,迫切需要转变开发方式提高油藏采收率。前期研究结果表明,火驱是该块最佳的开发方式。针对该块油层巨厚、地层倾角大、存水率高的特点,对火驱井网选择、燃烧方式、注采配置关系及操作参数进行了优化设计,并对开展的火驱先导试验进行综合评价,认识目前火驱燃烧状态、燃烧前缘推进规律以及油井受效特点,并分析了厚层油藏火驱存在的主要问题以及下步的攻关方向。该研究可为厚层块状稠油油藏火驱开发提供一定的技术借鉴。

The G block in Liaohe oilfield hosts ultra deep,thick-massive conventional heavy oil reservoirs which have entered the late development stage after 23 years of cyclic steam stimulation.It is in urgent need to convert development scheme and improve recovery factor.Previous research has shown that fire flooding is the best development method for this block.Fire flooding well pattern,combustion mode,injection-production relationship and operation parameters are optimized according to the characteristics of the block,such as huge thick reservoir,big stratigraphic dip and high water storage rate.This paper evaluates previous pilot test of fire flooding,understands present combustion state,combustion front propagation and oil well response feature,and analyzes the main problems of fire flooding for thick reservoirs and next step research direction.This research provides certain technical reference for fire flooding in thick-massive heavy oil reservoirs.