井身结构设计必封点综合确定方法研究

在对库车地区深井超深井井下复杂情况分析的基础上,综合考虑地层岩性和地层压力等影响因素,根据已有资料,用随机理论方法确定发生井下复杂情况的概率密度函数,得出井下复杂情况发生的位置及可能性,提出新的井身结构必封点确定方法。应用实例表明,用随机理论方法确定井下复杂情况是可行和有效的,井身结构设计中必封点的确定原则并不惟一,设计者应根据经验和实际情况加以取舍。

Comprehensive determination method of setting position for casing program design

Based on the downhole complicated conditions analysis of deep wells and ultra-deep wells in Kuche region,and comprehensively considering the influence factors,such as formation lithology and formation pressure,the probability density function of downhole complicated conditions was determined using the existing data by the probable theory method.Meanwhile,the position and possibility of downhole complicated conditions occurrence was derived,and the new determination method on setting position for casing program was put forward.The practical application results show that it is feasible and effective to determine the downhole complicated conditions by the probable theory method.The determination principle of setting position in casing program design is not sole,and the designer should make one's choice based on the experiences and actual conditions.