摘要
在大斜度井和水平井钻进的过程中,往往面临着储层分布范围不确定,地层构造幅度变化大等诸多风险,给水平井的钻进和地质评价带来了很大的困难。首先分析了随钻电阻率曲线在地层界面附近出现的"提前"、"延迟"以及极化效应,并指出利用其判断钻头在地层中的位置存在局限和不足,难以有效指导井眼轨迹的调整;随后介绍了电阻率探边工具,并举例说明了它的实际应用效果,其中包括一种可能的断层模式。结果表明,根据密度和电阻率成像图,结合随钻测井曲线,能够对当前钻遇的地层提供相对可靠的模式和依据,有效判断钻头在地层中的位置,尤其是靠近地层顶界还是底界这个关键问题,在指导水平井轨迹调整,保证油层钻遇率方面起到了很大的作用。
During drilling of the high- angle deviated well and horizontal wells,some risks or uncertainty factors were usually faced,such as the variety of reservoir distribution and structure amplitude,which brings a lot of difficulties for the horizontal well drilling and geological evaluation. First of all,the 'ahead','delay'and polarization effect of LWD resistivity curvesthat appears near the bed boundary were analyzed,and the existent insufficiency and limitation by using LWD resistivity curves to judge the bit location in the formation were pointed out. Then the resistivity boundary detection tool was introduced,and its actual application effect was illustrated. The field application results showed that the LWD boundary detection technology could provide reliable mode and views relatively for currently drilled formation,and judge the bit location in the stratum effectively to adjust the horizontal well trajectory,and ensure the drilling rate.
出处
《钻采工艺》
CAS
北大核心
2014年第3期26-30,7,共5页
Drilling & Production Technology
基金
国家科技重大专项"南海西部海域已证实的富生烃凹陷再评价及新领域勘探方向"(2011ZX05023-001-007)
关键词
水平井
随钻电阻率曲线
地质模式
探边工具
井眼轨迹
horizontal wells
LWD resistivity curve
geologic model
boundary detection tool
well trajectory
