裂缝与井筒连通的三重介质油藏试井解释方法

Well test interpretation method for triple media oil reservoir in which fracture communicated with wellbore

针对基岩、裂缝和溶洞组成的三重介质油藏,建立了裂缝与井筒连通的试井解释模型,采用Laplace变换和数值反演方法进行了求解。研究了三重介质油藏的渗流规律,分析了窜流系数和弹性储容比对压力响应的影响。提出了利用遗传算法自动拟合进行试井解释的新方法,并编制了应用软件。实例分析表明,该方法解释结果与现场测试资料吻合,具有较强的可靠性和实用性。

A well test interpretation model of the communication of fracture and wellbore is built for triplemedia reservoir composed of base rock, fracture and solution cavity. Solution is gotten using the Laplace transform and numerical inverse method. Seepage flow rule of the triplemedia reservoir is studied. The influence of interporosity flow coefficient and elastic storativity ratio on pressure response is analyzed. A new well test interpretation method of automatic matching by using genetic algorithm is presented and applied software is programmed. The case analysis shows that the interpreted result achieved by this method tallies with the field data, so it has strong practicability and reliability.