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中文摘要：
以稠油油藏为研究对象,针对过热蒸汽区加热半径及吞吐产能计算问题,通过建立过热蒸汽区瞬时能量平衡方程,运用拉氏变换及逆变换求得过热蒸汽区加热半径解析解,同时结合考虑重力的产能公式,建立了完整的加热半径及产能预测模型。研究了过热蒸汽区外边界温度对加热半径的影响、不同周期过热蒸汽区半径变化规律、重力对产能的影响以及不同生产制度下的过热蒸汽热利用率。研究表明：过热蒸汽区外边界温度增加,加热半径减小;吞吐周期增加,加热半径增加。实例中,总产油量中的重力驱出油量所占比重较大,且随着定产量的增加,过热蒸汽热利用率增加。新模型对油藏选取合理注采参数以及分析加热区热损失规律具有一定的指导意义。
英文摘要：
With consideration to heating radiusand productivities in zones with overheated steam for develnpment of heavy oil reservoirs, instantaneous energy-balance equations in overheated steam have been constructed. By using Laplace transformand inverse transformation, analytic solutions for heating radius in overheated steam zones can be reached. In addition, with consideration to productivity equation with gravity, sophisticated forecast models for heat- ing radiusand productivities have been const-ucted. Researches have been perforated to study impacts of outer boundary, temperatures on heating radiusof overheated steam zone, patterns in changes of radius of overheated steamzones, impacts of gravity on productivity and overheated steam heat utilization ratio in different production sys- tems. Research results show heating radius may decrease with increase in outer boundary temperatures of overheated steam zone. At the same time, the heating radius may increase with increases ofsoaking time. in field applications, oil prnduced through gravity drainage may occupy a large share in total oil production. In addition, overheated steam heat utilization ratios may be enhanced with inczases in productivity. The newly-developed models may provide valuahle guidance for identification of optimal prodaction/injection parameters and to determine heat losses in rele- vant zones.
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