识别水力裂缝参数的自动拟合模型和方法

AUTOMATIC MATCHING MODEL AND METHOD FOR DETERMINING HYDRAULIC FRACTURE PARAMETERS

为认识和了解地层、分析和评估压裂施工质量 ,分别考虑裂缝导流能力随生产过程变化和不变化的情形 ,提出了以生产过程中实测的产量或井底压力为拟合目标 ,识别水力裂缝参数的生产历史自动拟合模型和方法 ,用逐步二次规划法进行了数值求解。

The effect of hydraulic fracturing depends highly on the extent of understanding formation. In order to understand reservoir and evaluate the quality of fracturing treatment, considering fracture conductivity variation during producing process, a mathematical model that describes fluid unsteady flow in the formation and fracture is established, which is iteratively solved by means of utilizing the alternative direction implicit for solving flow models in formation and utilizing prediction correction method for solving flow models in fracture. An optimization model of automatic matching production history to determine fracture parameters is put forward, which is solved by the sequential quadratic programming method. The credibility and applicability of these models and methods are proved by sample calculation.