Tool for washing over, cutting and retrieving a portion of a pipe within a well bore

Patent · Tue May 05 04:00:00 EDT 1987

OSTI ID:6533934

Parra, E P; Haughton, B L

A tool is described for washing over, cutting and retrieving a portion of a pipe within a well bore, comprising an outer tubular body adapted to be connected to the lower end of a rotary pipe string for lowering into the well bore and over the upper end of the pipe; at least one knife each mounted on the outer body for movement between an outer position in which its cutting edge is free to move downwardly over the pipe and an inner position in which its cutting edge is adapted to engage the pipe; an inner tubular body vertically reciprocable within the outer body; a lower coil spring extending between the lower end of the inner body and an upwardly facing shoulder in the bore of the outer body; an upper coil spring supported on the upper end of the inner body; and means supported on the upper end of the upper spring for lowering over and then gripping the pipe as the outer body is raised with the pipe string.

• Assignee: NOV; NOV-87-061543; EDB-87-107169
• Patent Number(s): US 4662436
• OSTI ID: 6533934
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
CLEANING
CUTTING
CUTTING TOOLS
DRILL PIPES
DRILLING EQUIPMENT
EQUIPMENT
HOISTING
HOISTS
MACHINE PARTS
MACHINING
MATERIALS HANDLING
MATERIALS HANDLING EQUIPMENT
NATURAL GAS WELLS
OIL WELLS
PIPES
RETRIEVAL SYSTEMS
SPRINGS
TOOLS
WASHING
WELLS