Well tool retrieving apparatus

Patent · Tue May 23 04:00:00 EDT 1967

OSTI ID:6159510

Lance, L D

This overshot may be continually rotated to cut away accumulated debris until it is positively re-engaged with a fishing neck of a bridge plug. Various clutching devices allow this to be done. These clutching devices allow the overshot to be selectively secured to the fishing neck so that torque may be applied to a bridge plug mandrel as needed for releasing the bridge plug. The devices also enable the overshot to be positively coupled to the bridge plug so that the mandrel can be shifted in either longitudinal direction either without or in conjunction with rotation of the mandrel. Accordingly, with these clutching devices a positive engagement may be made with a bridge plug without sacrificing the ability to apply positive torque as well as longitudinal forces to be mandrel of the bridge plug. (10 claims)

• Assignee: Schlumberger Technol Corp.
• Patent Number(s): US 3321016
• OSTI ID: 6159510
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
CLEANING
ENERGY SOURCES
EXPLOSIONS
FOSSIL FUELS
FUELS
MANDREL OPERATION
NUCLEAR EXPLOSIONS
OIL WELLS
PETROLEUM
PLUGGING
RETRIEVAL SYSTEMS
TOOLS
UNDERGROUND EXPLOSIONS
WELLS