Subsea wellhead apparatus

Patent · Tue Dec 30 00:00:00 EST 1986

OSTI ID:6827825

Schuh, F J; Karish, J

This patent describes a subsea wellhead apparatus for use at a bottom of a sea and the like and with a floating drilling rig with a subsea blowout preventer stack for permitting injection of a waste fluid containing noxious, or toxic, substances into a fractured formation penetrated by a drilled borehole while drilling and including: a. strings of conduit suspended in a borehole penetrating subterranean formations below the bottom defining respective annular spaces therebetween and having conventional drilling strings of conduit operable for drilling, and b. a wellhead and accessories disposed above the bottom and sealingly connected with the plurality of strings of conduit so as to prevent unwanted invasion of fluids into the annular spaces. The improvement described here comprises: c. a first communicating aperture communicating with a first annular space intermediate a pair of strings of conduit; d. additional conduit means for fluid flow connected with the first communicating aperture and defining a sealed path for flow of the waste fluid; e. remotely operable, high pressure flow control valve means interposed in the additional conduit means of element d. for controlling flow of the fluid to the annular space; and f. remote control means for controlling the flow control valve; the remote control means being operably connected to the flow control valve and operable to open and shut the flow control valve responsive to a remote signal, whereby the waste fluid can be injected into the annular space without having to transport the waste fluid back to a disposal site.

• Assignee: Atlantic Richfield Co., Plano, TX
• Patent Number(s): US 4632188
• OSTI ID: 6827825
• Resource Relation: Patent File Date: Filed date 4 Sep 1985
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
42 ENGINEERING
NATURAL GAS WELLS
BLOWOUT PREVENTERS
WELLHEADS
OFFSHORE PLATFORMS
DRILLING RIGS
OIL WELLS
ANNULAR SPACE
BOREHOLES
DRILL PIPES
FLUID INJECTION
SEA BED
TOXIC MATERIALS
CAVITIES
CONFIGURATION
DRILLING EQUIPMENT
EQUIPMENT
MATERIALS
PIPES
SPACE
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing
420206 - Engineering- Mining & Drilling Equipment & Facilities- (1980-1989)
423000 - Engineering- Marine Engineering- (1980-)