特超稠油油藏蒸汽吞吐数值模拟

蒸汽吞吐是增加稠油产量的一种经济而有效的方法。克拉玛依油田九7区稠油在50℃时,地面脱气原油的粘度为2400～961000mPa·s,平均452029mPa·s,属超稠油油藏。针对克拉玛依油田九7区浅层特超稠油油藏的特点,利用数值模拟方法研究了蒸汽吞吐的主要注采参数。对注汽强度、注汽速度、周期注汽量、注汽压力、焖井时间和蒸汽干度等注汽参数进行了优化计算,推荐了注采参数的优化方案,在此基础上对蒸汽吞吐井的吞吐效果进行了预测,得到了不同周期的周期产油量等。计算结果对于克拉玛依油田九7区特超稠油油藏进行蒸汽吞吐开采具有一定的指导意义。

A Study on Numerical Simulation of Steam Stimulation for Super Heavy Oil Reservoir

Steam stimulation is a kind of economic and effective process for improving production of heavy oil. In District 9-(7) in Karamay oilfield, the viscosity of gas-free crude ranges from 2 400 mPa·s to 961 000 mPa·s at 50℃, averaging 452 029 mPa·s, belonging to super heavy oil. Based on these characteristics, the numerical simulation technique is applied to study of the main parameters given by steam stimulation process, including optimized calculation of the parameters such as steam injection intensity, steam injection velocity, cyclic steam injection volume, steam injection pressure, shut-in time and steam quality, as well as recommended the optimized program. The steam stimulation responses from the steam huff and puff wells are forecasted, obtaining the cycle production rates in different cycles. The results can be as a guide for super heavy oil production in District 9-(7) by steam stimulation process.