超稠油油藏转小井距蒸汽驱条件及时机

蒸汽驱是稠油油藏经过蒸汽吞吐开采后进一步提高原油采收率的主要热采阶段。但不是说任何时候转驱都可取得较好的效果。笔者系统研究了影响蒸汽驱开采效果的因素：原油粘度、油层有效厚度、纯总厚度比、起始含油饱和度和油层非均质性等,确定出适宜蒸汽驱开采的油藏条件。在分析稠油油藏加密吞吐后油藏条件变化的基础上．利用油藏工程数值模拟技术研究确定出超稠油油藏转小井距蒸汽驱的合理时机。

The study on switching to steamflooding conditions and opportunity from steam stimulation in super heavy oil reservoirs

Steamflooding is the main important stage in the thermal recovery of heavy oil reservoir, which can further enhance the recovery of heavy oil. But it does not mean any time might be reasonable to switch to steamflooding from stimulation. The author thoroughly studied those reservoir factors which impact the effect of steamflooding after comprehensively analyzing the main geologic features of super heavy oil reservoir in Henan oilfield. These reservoir condition for steamflooding are the net pay thickness of the oil formation, the ratio of net to gross thickness, the remaining oil saturation,the heterogeneity of oil formation and so on. On the basis of analyzing the changes of the reservoir condition after huff and puff in fillers , studied and confirmed the reasonable opportunity to switch to steamflooding from huff and puff with reservoir engeering methods and numerical simulation technology.