直井与水平井组合的蒸汽辅助重力泄油产量预测

Method of production forecast for SAGD with combination of vertical and
horizontal wells

郭二鹏 刘尚奇 王晓春 高永荣

中国石油勘探开发研究院，北京 100083

Research Institute of Exploration and Development, CNPC, Beijing 100083, China

蒸汽辅助重力泄油（SAGD）是一种利用液体自身重力作为主要驱动力的热采方式。国外的SAGD先导实验，大多数是利用双水平井的组合方式进行，注入井和采出井都是水平井，而在辽河油田进行的先导实验，是利用直井作为注入井、水平井作为生产井的组合方式。针对辽河油田先导实验的注采方式，利用保角变换，将水平井转化为像平面上一口环形生产井的一部分；垂直注汽井变成像平面上的原点。对直井与水平井组合的SAGD井组，按照直井划定流动单元，分别计算叠加，可以得到水平井的产量，提供了直井和水平井组合的重力泄油产量预测方法。依据辽河油田杜84块SAGD先导实验区实际生产数据，利用文中提供的方法进行计算，预测的产量结果与油田实际数据非常吻合，证明文中推导的直井与水平井组合的SAGD预测方法是可靠的。

SAGD(Steam-Assisted Gravity Drainage) is a thermal recovery method that produces only through liquid gravity. The pilot tests
are mainly based on dual horizontal well abroad, or injector and producer are all horizontal wells.In Liaohe Oilfield, a pilot test with
vertical injector and horizontal producer is on this way. According to the actual conditions in Liaohe Oilfield, the injector and
producer are transformed through conformal mapping so that it can be analyzed through mathematical approach. With gravity
drainage theory, the steam chamber is analyzed and the production of every horizontal section controlled by one vertical injector can
be derived. The result is perfectly coinciding to the production data of SAGD pilot test in Block Du84, and this indicates that the
prediction method is dependable in the paper.