Plug and Abandonment Basics - George E King Petroleum ...

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Setting Cement Plugs• A near 100% reliable system if cross flow canbe stopped.• Most cement plugs fail because of cross flow,density and viscosity mismatch, or failure to“break” the fluid momentum.• Full plug method described and field tested inSPE 11415 (published in SPE JPT Nov 1984, pp1897-1904) and SPE 7589.3/14/2009 16George E. King EngineeringGEKEngineering.com
Cement Plug FailureMany cement plugs fail for the same 4 reasons:1. Cross flow cuts channels into the plug.2. Cement is higher density that the mud – cementfalls through the mud. Mud contamination of thecement may keep it from setting.3. The mud is much lower viscosity than the cementslurry – cement falls through the mud4. The open ended tubing produces a highmomentum energy condition that the mud cannotstop – thus cement falls through the mud.The result of the last three is that the cement isspread out along the hole and a plug is never formed.3/14/2009 17George E. King EngineeringGEKEngineering.com
Page 1 and 2: Plug and Abandonment - Producing We
Page 3 and 4: Abandonment Types• P&A - plugged
Page 5 and 6: Well damage increases the P&A cost
Page 7 and 8: Legislative Drivers• Safe Water D
Page 9 and 10: Requirements• Plug thickness (hei
Page 11 and 12: Materials Used in Abandonment• Ce
Page 13 and 14: Cement Plugs• Cement slurry desig
Page 15: Setting a cement plug• Not as eas
Page 19 and 20: Diverter Plug on End of TubingA sim
Page 21 and 22: Sand fall rates in various fluids10
Page 23 and 24: General Requirements• Onshore - 1
Page 25 and 26: Isolation of Open Hole• Cement Pl
Page 27 and 28: Isolation of lap joints or liner to
Page 29 and 30: Identifying Channels in Cement Shea
Page 31 and 32: Abandonment Gun Systems for Large C
Page 33 and 34: Testing of Plugs• Location of the
Page 35 and 36: Disclaimer• These slides are very
Page 37: References on Cement Channel Locati

Plug and Abandonment Basics - George E King Petroleum ...

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