公开(公告)号：CA2846749C

公开(公告)日：2016-06-28

申请号：CA2846749

申请日：2011-01-05

Applicant: WEATHERFORD/LAMB INC

Inventor： BAILEY THOMAS F ,  MITCHELL MARK ,  PAVEL DAVID ,  RING LEV ,  BANSAL RAM K ,  IBLINGS DAVID

IPC: E21B21/10 ,  E21B7/00 ,  E21B19/16 ,  E21B21/12

Abstract: A method for drilling a wellbore includes drilling the wellbore by advancing the tubular string longitudinally into the wellbore; stopping drilling by holding the tubular string longitudinally stationary; adding a tubular joint or stand of joints to the tubular string while injecting drilling fluid into a side port of the tubular string, rotating the tubular string, and holding the tubular string longitudinally stationary; and resuming drilling of the wellbore after adding the joint or stand.

公开(公告)号：CA2744842C

公开(公告)日：2017-02-07

申请号：CA2744842

申请日：2008-03-31

Applicant: WEATHERFORD/LAMB INC

Inventor： NOSKE JOE ,  IBLINGS DAVID ,  PAVEL DAVID ,  BRUNNERT DAVID J ,  SMITH PAUL ,  GRAYSON MICHAEL BRIAN

IPC: E21B34/06 ,  E21B34/14

Abstract: Methods and apparatus enable reliable and improved isolation between two portions of a bore extending through a casing string disposed in a borehole. A downhole deployment valve (DDV) may provide the isolation utilizing a valve member such as a flapper that is disposed in a housing of the DDV and is designed to close against a seat within the housing. The DDV includes an operating mechanism for opening/closing the DDV. In use, pressure in one portion of a well that is in fluid communication with a well surface may be bled off and open at well surface while maintaining pressure in another portion of the casing string beyond the DDV.