Wells – Submerged well – Riser
Reexamination Certificate
2007-11-07
2011-10-11
Beach, Thomas (Department: 3674)
Wells
Submerged well
Riser
C166S339000, C166S344000, C166S352000, C166S360000, C166S268000, C175S005000, C175S007000, C175S048000, C175S212000
Reexamination Certificate
active
08033335
ABSTRACT:
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 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.
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Leuchtenberg Christian
Orbell Charles R.
Beach Thomas
Buck Matthew
Halliburton Energy Service,s Inc.
Smith IP Services P.C.
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