Offshore universal riser system

May 14, 2008
An offshore universal riser system (OURS) and injection system (OURS-IS) inserted into a riser.

Offshore staff

United States Patent Application: 20080105434
Serial No.: 936411
Series Code: 11
Applicant: HALLIBURTON ENERGY SERVICES, INC.
Inventors: Orbell; Charles R.; (Midland, TX); Leuchtenberg; Christian; (Jakarta, ID)
Title: Offshore universal riser system
An offshore universal riser system (OURS) and injection system (OURS-IS) inserted into a riser. The OURS/OUR-IS provides a means for pressurizing the marine riser to its maximum pressure capability and easily allows variation of the fluid density in the riser. The OURS-IS includes a riser pup joint with provision for injecting a fluid into the riser with isolation valves. The OURS includes a riser pup joint with an inner riser adapter, a pressure test nipple, a safety device, outlets with valves for diverting the mud flow, nipples with seal bores for accepting rotating control devices (RCDs). The easy delivery of fluids to the OURS-IS is described. A method is detailed to manipulate the density in the riser to provide a wide range of operating pressures and densities enabling the concepts of Managed Pressure Drilling, Dual Density Drilling or Dual Gradient Drilling, and Underbalanced Drilling.

5/14/08

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