DRILLSTRING

专利名称：DRILLSTRING发明人：JEFFRYES, Benjamin P.申请号：EP14863279申请日：20141120公开号：EP3071780A4公开日：20161207

摘要：A drillstring comprising a length of drillpipes and a bottomhole assemblydisposed at a downhole end of the length of drillpipes. The bottomhole assemblycomprises a transition section proximal to the end of the length of drillpipes to reducevibration of the bottomhole assembly during drilling. The transition section variesgradually in acoustic impedance between the acoustic impedance of the drillstring abovethe transition section and the acoustic impedance of the bottomhole assembly below thetransition section. The transition section forms at least thirty percent (30%) of the totallength of the bottomhole assembly.

申请人：Services Pétroliers Schlumberger,Schlumberger HoldingsLimited,Schlumberger Technology B.V.

更多信息请下载全文后查看