Well casing jack mechanism

Patent · Tue Jun 17 04:00:00 EDT 1986

OSTI ID:5599728

Boyadjieff, G I; Campbell, A B

A method is described which consists of: drilling a well utilizing rig which includes a mast projecting upwardly above the well in a predetermined drilling position, and utilizing a drill string extending along a predetermined axis relative to the mast and downwardly into the well; removing the drill string from the rig after completion of the drilling operation; then lowering along the axis and into the well, while the mast remains in the drilling position above the well, a string of casing which, during at least a portion of the casing lowering operation, has a weight greater than the load supporting capacity of the mast used in drilling; effective the downward movement of the casing string, during at least the portion of the casing lowering operation when the weight of the string exceeds the capacity of the mast, by relatively vertically actuating two casing supporting units of a jacking mechanism positioned in the rig, with the casing string being supported alternately by the two units respectively; and transmitting downward load forces resulting from the weight of the casing string from each of the supporting units to the earth without transmission of the forces through the mast, but while the mast used in drilling remains in the drilling position above the well.

• Assignee: Varco International, Inc., Orange, CA
• Patent Number(s): US 4595062
• OSTI ID: 5599728
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
DRILL BITS
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
DRILLING RIGS
EQUIPMENT
HOISTING
HOISTS
MATERIALS HANDLING
MATERIALS HANDLING EQUIPMENT
NATURAL GAS WELLS
OIL WELLS
PIPES
POSITIONING
WEIGHT
WELL CASINGS
WELL DRILLING
WELLS