Kelly mud saver valve sub

Patent · Tue Dec 02 00:00:00 EST 1986

OSTI ID:7053251

Reddoch, J A

A mud saver valve is described for preventing drilling mud from escaping from a kelly when a drill string is broken below the kelly, the valve comprising: a tubular valve body having first and second ends, the first end being provided with means for attachment in fluid communicating relationship with the kelly, the second end being provided with means for attachment to the drill string; an annular seat fixed in the interior of the valve body adjacent its first end; a tubular closure member within the valve body. The closure member is provided with a selectively closed seating end for seating in valve closing engagement with the annular seat, an open non-seating end in fluid communicating relationship with the drill string, and an annular expansion in the outer diameter of the closure member adjacent the seating end; a top and bottom spacer ring disposed in sliding relationship around the tubular closure member intermediate the annular expansion and the non-seating end of the closure member. The spacer ring and annular expansion cooperatively define an annular chamber around the closure member; and a helical spring disposed around the closure member towards the annular seat.

• Assignee: NOV; NOV-85-036501; EDB-87-012862
• Patent Number(s): US 4625755
• OSTI ID: 7053251
• Resource Relation: Patent File Date: Filed date 7 Aug 1984
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
DRILLING FLUIDS
VALVES
NATURAL GAS WELLS
OIL WELLS
CLOSURES
DRILL BITS
DRILL PIPES
EXPANSION
SEALS
CONTROL EQUIPMENT
DRILLING EQUIPMENT
EQUIPMENT
FLOW REGULATORS
FLUIDS
PIPES
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing