Drill pipe inside blowout preventer
This patent describes an inside blowout preventer for use in a drill string comprising in combination: a valve body having upper and lower ends for connection to the drill string; a longitudinal passage extending through the body with an upper inlet and a lower outlet for the passage of fluid, having an upper section tapering gradually to a central section with a larger flow area and a lower section tapering gradually downwardly from the central section to a smaller flow area portion; a ball seat located in the upper section and facing toward the outlet. The length of the upper section is substantially greater than the diameter of the seat; a ball storage member having an upper end containing a concave socket facing the inlet for snugly receiving the ball and located in the central section of the longitudinal passage, in case of upward flow from the outlet to the inlet of sufficient velocity, the ball being movable from the socket to the seat; and a generally tooth-shaped guide member projecting upwardly from an edge of the socket for guiding the ball into the socket.
- Assignee:
- Hughes Tool Co.-USA, Houston, TX
- Patent Number(s):
- US 4694855
- OSTI ID:
- 5950473
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
BLOWOUT PREVENTERS
CONTROL EQUIPMENT
DESIGN
DRILL PIPES
DRILLING EQUIPMENT
EQUIPMENT
FLOW RATE
FLOW REGULATORS
FLUID FLOW
FLUID MECHANICS
HYDRAULICS
MECHANICS
NATURAL GAS WELLS
OIL WELLS
PIPES
SPHERES
VALVES
WELLS