Patent ID: 8636087
Filing Date: 2014-01-28
Classification: E21B

Abstract:
1. Method for providing a differential pressure on a first sealing element of a rotating control device, wherein said rotating control device having an inner member having said first sealing element and a second sealing element rotatable relative to an outer member, the method comprising the steps of: providing a wellhead; determining a wellbore pressure at said wellhead; calculating a first predetermined fluid cavity pressure using said determined wellbore pressure; positioning a tubular with said rotating control device; sealing said first sealing element and said second sealing element of said rotating control device with a tubular; and supplying said first predetermined fluid cavity pressure in a first cavity defined by said rotating control device inner member, said rotating control device first sealing element and said rotating control device second sealing element when said first sealing element and said second sealing element are sealed on said tubular.