Well pipe jack

Patent · Tue Oct 30 04:00:00 EST 1984

OSTI ID:6094181

Boyadjieff, G I; Campbell, A B

A jack for lowering casing from a drilling rig into a well, including a plurality of piston and cylinder mechanisms extending vertically at different sides of the well axis and supported at their lower ends from a base, a first structure extending between upper ends of the cylinders of those mechanisms and supported from the base through the cylinders, a second structure supported by and movable with the pistons, and gripping units carried by the two structures and releasably engageable with the casing to lower it in steps by relative vertical actuation of the two structures by the piston and cylinder mechanisms.

• Assignee: Varco International, Inc.
• Patent Number(s): US 4479547
• OSTI ID: 6094181
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
CONTROL EQUIPMENT
CYLINDERS
DESIGN
DRILLING RIGS
EMPLACEMENT
EQUIPMENT
HYDRAULIC CONTROL DEVICES
MATERIALS HANDLING EQUIPMENT
NATURAL GAS WELLS
OIL WELLS
PISTONS
WELL CASINGS
WELLS