Subsea master valve for use in well testing

Patent · Tue Apr 21 04:00:00 EDT 1987

OSTI ID:6825418

Doremus, B; Meek, D E

This patent describes an apparatus adapted to be landed in a subsea wellhead and used to control the flow of fluids therefrom. It comprises a relatively short length valve body having a flow passage. First, a normally closed valve means for opening and closing the flow passage; a control valve unit having a flow passage and being adapted to be connected to a pipe string extending upwardly to the surface, a remotely operable means for releasably connecting the control unit to the valve body. And second, normally open valve means in the control unit for retaining fluids in the pipe string when the connecting means is released; further including means responsive to the application of a hydraulic control pressure to an interior region of the control unit for releasing the connecting means; and vent passage and valve means that are opened in response to the application of the hydraulic control pressure for bleeding any excessive pressure between the first and second valve means to the exterior of the control unit prior to release of the connecting means.

• Assignee: Schlumberger Technology Corporation, Houston, TX
• Patent Number(s): US 4658904
• OSTI ID: 6825418
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
CONDUCTOR DEVICES
CONNECTORS
CONTROL
CONTROL EQUIPMENT
DRILL BITS
DRILL PIPES
DRILLING EQUIPMENT
ELECTRICAL EQUIPMENT
EQUIPMENT
FLOW REGULATORS
FLUID FLOW
HYDRAULIC CONTROL DEVICES
OIL WELLS
PIPES
PRESSURE CONTROL
TESTING
UNDERWATER OPERATIONS
VALVES
VENTS
WELLHEADS
WELLS