充气欠平衡钻井MWD信号衰减原因分析与解决方法  

Reason analysis and solve method to the attenuation of MWD signal in aerated underbalanced drilling

作　　者：马骁[1] 陈一健[1] 孟英峰[1] 李皋[1] 李红涛[1] 李兵[1] 

机构地区：[1]油气藏地质及开发工程国家重点实验室.西南石油大学,四川成都610500

出　　处：《石油钻采工艺》2012年第4期50-53,共4页Oil Drilling & Production Technology

基　　金：国家重点基础研究发展计划(973计划)项目"深井复杂地层安全高效钻井基础研究"(编号:2010CB226704);国家科技重大专项课题"窄密度窗口安全钻完井技术及装备"(编号:2008ZX05021-003)联合资助

摘　　要：充气欠平衡钻井中,井下随钻测量设备MWD发射的钻井液脉冲在传播的过程中衰减程度很高,地面设备无法完成对井眼轨迹的监测与控制。通过建立充气欠平衡钻井MWD信号传输模型,分析制约压力波信号传输的因素,提出调整地面接收器安装位置和改造注气方式两种解决方案并进行现场试验。结果表明:地面传感器的安装位置对信号接收没有影响;改造注气方式将气液充分混合后对信号传输有一定的改善作用,可以提升MWD的有效测量距离。In aerated underbalanced drilling, the attenuation of the mud pluses emitting by the underground measure-while-drilling （MWD） equipment is at a high degree, and monitoring and controlling on well trajectory cannot be measured by ground receptor. By establishing the mathematical modelling of the MWD signal transmission and analyzing the reasons of restricting the signal transmission, two solutions were proposed and was followed by field test which involve adjusting the installation site of the MWD ground sensor and transforming gas injection manner. The results show that the installation site of the MWD has no influence on the signal receiving, transforming gas injection manner through fully mixing gas and liquid could slightly improve the signal transmission and enhance the effective measurement distance of MWD.

关 键 词：充气欠平衡钻井 MWD 钻井液脉冲 地面接收器 注气方式 

分 类 号：TE242[石油与天然气工程—油气井工程]