双水平井SAGD挤液预处理启动水力连通模型

Hydraulic Connection Model in Squeeze Preprocessing SAGD Start-up

为了定量获取注采井间连通及扩容信息,以风城油田SAGD挤液预处理启动为例,采用有限元软件ABAQUS计算扩容过程中储层变形及渗流特性,通过监测压力,结合德雷克-普拉格力学本构模型,按照比值定义法、权重思想和乘法原则建立了扩容过程中的水力连通模型,依靠数据分析中回归方法得出了扩容半径的计算公式。结果表明,风城SAGD超稠油储层的水力连通系数为0.6~0.8,系数越大,扩容区域越大,后期预热蒸汽用量越少。模型预测与实际监测数据吻合效果好,相对误差小于5%,说明建立的水力连通模型是有效的。

In order to obtain the connection and expansion information between,taking squeeze preprocessing SAGD start-up in Fengcheng Oilfield as example,the reservoir deformation and seepage characteristics in squeeze process were calculated by means of software ABAQUS,the hydraulic connection model between water injecting well and production well was established based on pressure monitoring data and Drake-Prager mechanics constitutive model,and ratio definition,weight idea and multiplication principle,and the regression formula of expansion radius was obtained. It is shown that the hydraulic connectivity coefficient of Fengcheng oilfield SAGD reservoir is 0. 6 ~ 0. 8. The bigger the coefficient is,the larger the expansion area is,the less the consumption amount of preheated steam is. The coincidence degree of model prediction results with the actual monitoring data is high,and their relative error is less than 5%,which shows that the established hydraulic connection model is effective.