Subsea choke and riser pressure equalization system

Patent · Tue Jul 01 04:00:00 EDT 1980

OSTI ID:5150384

Shanks, F

A description is given of a subsea choke and riser pressure equalization system comprising, in combination: a section of riser pipe; a choke conduit line mechanically supported by said riser pipe; a variable choke valve having an inlet port and a discharge port; a gate valve having an inlet port and a discharge port; a gate valve having an inlet port conected in fluid communiction with the choke line and an output port connected in fluid communication with the inlet port of the variable choke for permitting diversion of fluid from the choke line to the variable choke; and, means connecting the discharge port of the variable choke in fluid communication with the interior of the riser section, said means including a discharge conduit extending from said choke valve in inclined relation with respect to the axis of said riser, whereby fluid diverted from said choke conduit is discharged into said riser in counterflow relation with respect to the upward flow of drilling fluid through said riser.

• Assignee: Sedco Inc
• Patent Number(s): US 4210208
• OSTI ID: 5150384
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
BOREHOLES
CAVITIES
CONTROL
CONTROL EQUIPMENT
COUNTERFLOW SYSTEMS
DESIGN
DISCHARGE CANALS
DRILLING
EQUIPMENT
FLOW REGULATORS
FLUID FLOW
MARINE RISERS
OFFSHORE DRILLING
OFFSHORE PLATFORMS
PIPES
PRESSURE CONTROL
PRESSURE REGULATORS
RESERVOIR PRESSURE
VALVES
WELL PRESSURE
WELLHEADS