射孔完井的产能预测及射孔参数优化设计

A PREDICTION OF THE PRODUCTIVITY IN A PERFORATED WELL AND AN OPTIMIZATION OF THE PARAMATERS IN PERFORATION OPERATION

本文根据射孔完井电模拟及有限元数学模型研究的结果,分析了射孔参数、射孔损害、钻井损害及地层非均质性等因素对射孔井产能的影响;分析了诸因素对油井产能影响的相对重要性排列顺序:介绍了表达上述定量关系的回归方程和诺模图。据此可以方便、快速地预测在各种参数下油井的产能和表皮系数;并可以进行油井产能最高的射孔参数优化设计。本文还介绍了射孔参数优化设计的内容、方法和步骤。华北油田现场应用结果表明,优选射孔参数后油井产能平均提高15～25％。

High quality perforation is an important project in well completion for the purpose of formation protection and damage prevention. This paper, based on the results of modeling of well perforation by means of an electric resistance network and those obtained by a finite element technique, gives a comprehensive analysis of the effects of various factors on well productivity, such as perforation parameters, perforation damage, damage during drilling, and anisotropy of the reservoir formation etc. The relative importance of various factors are analysed and they are presented according their relative importance. A regressive equation including the above factors and a corresp- onding nomogtram are presented. Thus it is easy and convenient to predict the well prodictivity with different combination the above factors, and an optimyzed design of the perforation parameters can be carried out easily also. This paper also suggests contents, mothod and procedures in volved in an optimum design of well perforation operation. Results of field application (in Huabei oil field)show that well productivity is increased by 15-25%. Practices show that a comprehensive and accurate evaluation of the well productivity after perforation, reasonable choice of perforation parameters and an optimum perforation design have a significant economical benefit and a high practical significance.