对蒸汽驱几个问题的探讨

An approach to several problems of steam flooding

方法利用数值模拟法，研究了影响蒸汽驱的主要油藏参数和操作参数，并阐明了蒸汽吞吐与蒸汽驱及蒸汽驱与水驱、聚合物驱的相互关系。目的为了选择合理的开发方式，保证蒸汽驱有效的运作，提高原油采收率。结果影响蒸汽驱开发效果的油藏参数是油层净厚度、原油粘度、含油饱和度、油层非均质性、净总厚度比及油藏埋深；对于适合蒸汽驱的油藏而言，只有在注汽速度床注比、蒸汽干度均高于其临界值时，才能取得好的开发效果；地层原油粘度在很大程度上决定了油藏的开发方式，只有当地层原油粘度大于30mPa·s时，蒸汽驱才能比水驱更经济有效。结论在注蒸汽前，应对油藏条件做出充分评估，同时满足蒸汽驱操作参数，通过不同的开发方式评价选取最佳的开发方式。

Method By using numerical simulation, this paper studies main reservoir parameters and operation parameters which affecting steam flooding,and expounds the relationships between steam soaking and steam flooding,as well as steam flooding and water drive,polymer flooding. Purpose in order to chose rational development scheme,to run steam flooding effectively,and to enhance oil recovery factor. Result Those parameters which affecting development result of steam flooding are net thickness of payzone, oil viscosity, oil saturation, reservoir heterogeneity,ratlo of net gross thickness and leservoir depth;for those reservoirs suitable for steam flooding,good development result can be achieved only when steam injection rate, production-injection ratio and steam quality are higher than their critical values; formation oil viscoslty decides the development scheme of reservoir to a great extent, and steam flooding is more efficient than water drive only when formation oil viscosity is higher than 30 mPa. s. Conclusion Before steam injection,sufficient evaluation for reservoir conditions should be done. Operation parameters of steam flooding should also be met. The optimum development scheme should be chosen through evaluating different developmentsches.