一种实时诊断钻具黏滑现象的新方法

A new method of diagnosing stick-slip phenomenon of downhole drillstring

杨全进 左信 李建峰 杨锦舟

YANG Quanjin ZUO Xin LI Jianfeng YANG Jinzhou

中国石油大学地球物理与信息工程学院，北京　102249 胜利石油管理局钻井工艺研究院，山东东营　257017 中国石油物资公司，北京　100029

College of Geophysics and Information Engineering, China University of Petroleum, Beijing 102249, China Drilling Technology Research Institute, Shengli Petroleum Administration Bureau, Dongying 257017, China China Petroleum Material Corporation, Beijing 100029, China

钻具黏滑现象严重时会损坏井下设备，造成井下事故，影响井下安全，如何及时有效发现并消除黏滑现象对钻井施工意义重大。目前国内多通过监测地面转盘驱动电流、转盘扭矩来观测井底钻具黏滑现象，为了更及时、准确地预测钻具黏滑现象，采用井下MWD磁传感器数据来分析钻具黏滑现象。通过井下计算机对传感器信号实时高速采集，计算出井底钻具的瞬时转速，用以诊断钻具黏滑现象并对黏滑严重程度分类形成黏滑程度特征码，并将这些特征码通过MWD实时传送到地面以便及时采取措施，有效减少了由于黏滑现象而引起的井下事故。

The stick-slip phenomenon is very common in downhole drilling process. It is harmful for drilling project and could damage downhole devices, and even brings about dowmhole accident, which is a threat for downhole safety. So it is significant to timely find and remove stick-slip for drilling operation. Domestic drilling contractors and surface logging companies have attempted to study and predict stick-slip phenomenon at downhole by monitor the driver motor current and rotary table torque. The paper provides a new method to describe the downhole stick-slip phenomenon by measuring actual rotational speed of the lower BHA from MWD magnetic sensor, which give a better insight to the downhole drillstring movement, and classifies the severity of stick-slip to several ranks. The information is send to the surface by MWD so that the driller can take some useful manners to decrease the stick-slip and keep drilling process in safety.