蒸汽吞吐井流入动态研究

根据蒸汽吞吐井的生产特征，建立了广义流入动态关系的合理性边界条件，确定了其涵盖性特征。以油藏数值模拟为手段，对蒸汽吞吐井弹性开采过程中注汽参数的敏感性进行了分析，结果表明周期注汽量、蒸汽干度和采液速度是影响蒸汽吞吐效果的主要因素。以国内几个主要稠油油田的油藏及蒸汽吞吐井动态为基础，建立了不同类型的油藏和油井蒸汽吞吐的流入动态关系。不同类型油藏和油井的蒸汽吞吐流入动态具有相似特性，即都具有油井产能关系的线性特征、油藏平均压力随累积采注比（ＰＩＲ）变化的线性特征、极限产液量随ＰＩＲ变化的幂指数型特征、井底温度随ｌｎ（ＰＩＲ）变化的逻辑斯蒂函数型特征和含水率随ＰＩＲ变化的指数型特征等。将研究结果与草平１井第二周期的矿场实际生产资料进行了对比，两者基本吻合

INFLOW PERFORMANCE RELATIONSHIP FOR STEAM STIMULATION WELL

Based on temperature and watercut trends of steam soak well, a new concept about extensive inflow performance relationship(EIPR) for steam stimulation well is proposed. The new EIPR overlaps reasonable well performances and isotherm IPR under extreme production conditions. Sensitivity of injection parameters is studied. It shows that the quantity of steam injected into well (cold water equivalent), steam quality at bottom hole, and production rate are the major factors affecting oil increment. EIPR is obtained from some steam soak wells of several major heavy oil reservoirs in China. The ratio of produced cumulative liquids to injected steam (\%PIR\%) is the major factor affecting EIPR which has a similar feature for different kinds of reservoirs and wells. The production ratepressure performance relation is in linear form. Reservoir pressure has a linear form versus. PIR. Maximum liquid production rate is an exponent form versus. PIR. Bottom hole temperature has a logistic form versus. ln(\%PIR\%). Watercut is an exponent form versus. PIR. The prediction performance obtained from the new EIPR of a horizontal well has a good agreement with the field data.