摘要
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.
出处
《石油钻采工艺》
CAS
CSCD
北大核心
2012年第1期114-116,共3页
Oil Drilling & Production Technology
基金
国家科技重大专项"大型油气田及煤层气开发项目
低渗油气田高效开发钻井技术
储层有效进尺最大化钻井技术"(编号:2011ZX05022-003)资助
关键词
井底钻具
黏滑
磁传感器
瞬时转速
黏滑特征码
bottom drilling string
stick-slip
magnetic sensor
instantaneous rotary speed
characteristic code
