<p>Embodiments of the present invention include methods and apparatus for dynamically controlling pressure within a wellbore while forming the wellbore. In one aspect, one or more pressure control apparatus are used to maintain desired pressure within the wellbore while drilling the wellbore. In another aspect, pressure is dynamically controlled while drilling using foam to maintain a substantially homogenous foam flow regime within the wellbore annulus for carrying cuttings from the wellbore.</p>
申请公布号
CA2539266(C)
申请公布日期
2011.10.11
申请号
CA20062539266
申请日期
2006.03.01
申请人
WEATHERFORD/LAMB, INC.
发明人
TILTON, FREDERICK T.;HAUGEN, DAVID M.;SMITH, KEVIN W.;BRUNNERT, DAVID J.;BAILEY, THOMAS F.;FULLER, TOM;ROOYAKKERS, ROY W.;BANSAL, RAM K.;SKINNER, GRAHAM