基于生产井监测温度的SAGD蒸汽腔定量描述解析模型

The production well temperature monitoring based analytical model for the quantitative description of SAGD stream chamber

针对风城超稠油油藏SAGD开发过程中水平段动用程度低、蒸汽腔扩展不均匀的问题,利用传热学理论及公式推导,得出水平生产井温度系数T*的半对数曲线斜率,即温降系数m与蒸汽腔体积存在的指数关系。通过风城A井区a1井组的数值模型拟合,计算了各测温点温降系数m,并回归出温降系数m与对应蒸汽腔体积的指数关系式,最后用邻井实测数据验证了关系式的适用性。研究结果表明,邻井实测数据计算结果与数模结果基本一致,证明该关系式具有较强的实用性,实践中可直接利用此关系式描述蒸汽腔形态,为SAGD蒸汽腔的快速、定量描述提供指导。

During the SAGD development of Fengcheng super heavy oil reservoir,the producing degree of horizontal section is low and the expansion of steam chamber is not uniform.To solve these problems,this paper obtained the semi-log curve slope of the temperature coefficient(T*)of horizontal production well by means of heat transfer theory and formula derivation,which is the exponential relation between temperature drop coefficient(m)and steam chamber volume.Then,through the numerical simulation fitting of a1 well group in Fengcheng A Well Block,the temperature drop coefficient(m)of each temperature monitoring point was calculated,and the exponential relation expression between temperature drop coefficient(m)and its corresponding steam chamber volume was regressed.Finally,the applicability of this expression was verified by using the measurement data of the neighboring well.It is indicated that the numerical simulation result is basically accordant with the calculation result based on the measurement data of the neighboring well,which proves the stronger applicability of this expression.In practice,this expression can be used directly to describe the shape of steam chamber,so as to provide the guidance for the rapid quantitative description of SAGD steam chamber.