Patent ID: 8220553
Filing Date: 2012-07-17
Classification: E21B

Abstract:
1. Method for operating a subsea grease cartridge system, the method comprising the steps of: attaching a first grease container filled with grease and a second grease container filled with grease to a subsea assembly; applying hydraulic pressure to said first grease container through an umbilical; pumping said grease of said first grease container into a grease head forming a seal between a line and a well, maintaining said seal in an air-tight relationship with said well and said line; switching application of said hydraulic pressure from said first grease container to said second grease container instantaneously when said first grease container becomes unable to supply grease to said grease head at a desired rate and pressure; and pumping said grease of said second grease container into said grease head forming said seal between said line and said well, maintaining said seal in an air-tight relationship with said well and said line in order to provide a constant supply of grease to said line and said well, wherein said step of applying hydraulic pressure further comprises: wherein said step of pumping said grease from said first grease container further comprises: