A New Continuous Flow System - Drilling Engineering Association
A New Continuous Flow System - Drilling Engineering Association
A New Continuous Flow System - Drilling Engineering Association
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
<strong>Continuous</strong> <strong>Flow</strong> Sub <strong>System</strong><strong>Drilling</strong> <strong>Engineering</strong> <strong>Association</strong>, Quarterly Meeting6/23/09
CFS OverviewCFS is a sub based system thatallows flow to continue during drillpipe connections while drilling andtripping out.Any hole section length can bedrilled with continuouscirculation. 1 sub is needed foreach stand.Focus of design is reducedconnection time and safeoperation.CFS has smaller footprint thancomparable systems.CFS enhances Constant BottomHole Pressure (CBHP) variant ofMPD.© 2009 Weatherford. All Rights Reserved. CONFIDENTIAL. 2
CFS Benefits to OperatorStable downhole pressure management resulting in:• Reduced mud losses.• Reduced likelihood of kicks.• Reduction of pressure spikes associated with breaking circulation.• Reduced chance of stuck pipe.• Less formation damage.Better hole cleaning.Better cooling for downhole tools.Ability to drill and trip out of a hole section while continuouslycirculating, reducing the chance for problems in open hole.© 2009 Weatherford. All Rights Reserved. CONFIDENTIAL. 3
CFS <strong>System</strong> Implementation on RigCFS Control Panel is positionedin a safe area on rig floor.Side Circulation Hose is routedto rig floor.CFS Suspension Device andClamp are placed on rig floor.<strong>Flow</strong> Control Skid is positionednear main mud flow line andintegrated into mud system.© 2009 Weatherford. All Rights Reserved. CONFIDENTIAL. 4
CFS Safety FeaturesClamp/Actuator device installed onto sub by operator with no pressure inside circulation hose.Side Port Pressure Plug removed hydraulically after Clamp/Actuator deviceinstalled, preventing potential exposure of personnel to pressure.Operator is not required to be near any high pressure piping during flowswitching procedure.<strong>Flow</strong> switching procedure is automatic and controlled by a PLC withoperator input.Make up or break out of connections is done normally. CFS does notinterfere with operation of manual or power tongs.© 2009 Weatherford. All Rights Reserved. CONFIDENTIAL. 5
CFS SpecificationsAll system components are rated to5000 psi.Hydraulic Control <strong>System</strong> is ATEXZone 2 certified. Sub has 4 ½ IF connections, 6-5/8”OD, 36” long. Through bore is 2”.Permits wireline access afterrunning a lock-open tool to openflapper-style valves in all subsdownhole in one trip.© 2009 Weatherford. All Rights Reserved. CONFIDENTIAL. 6
CFS Operation (1 of 3)Completed drilling stand of pipe.Ready to make Connection.CFS Clamp attached.Plug removed from side port.<strong>Flow</strong> initiates into side port.© 2009 Weatherford. All Rights Reserved. CONFIDENTIAL. 7
CFS Operation (2 of 3)<strong>Flow</strong> through Top Drive stopped.<strong>New</strong> stand made up to CFS.Check valve closes.<strong>Flow</strong> re-established through Kelly.Top Drive removed.© 2009 Weatherford. All Rights Reserved. CONFIDENTIAL. 8
CFS Operation (3 of 3)<strong>Flow</strong> through side port stopped.Clamp removed.Plug re-installed.<strong>Drilling</strong> resumes normally.© 2009 Weatherford. All Rights Reserved. CONFIDENTIAL. 9
CFS Project StatusPreliminary lab tests of CFShardware completed.Complete lab test on rig by Q42009. Ready for field test in Q4 2009.© 2009 Weatherford. All Rights Reserved. CONFIDENTIAL. 10
Change language