Side entry sub well logging apparatus and method

Patent · Tue Jul 07 04:00:00 EDT 1987

OSTI ID:6151499

Rankin, E E

A well logging system is described in which conductor cable extends outside of a string of drill pipe into a sidewall passage of a side entry sub and through the drill pipe to a logging instrument located at the lower end of the drill pipe. An improved apparatus releases the side entry sub from the drill pipe if the drill pipe becomes stuck, comprising; a release sub adapted to be connected to the drill pipe below the side entry sub; a tubular mandrel adapts to be carried in the side entry sub and to extend into the release sub, the mandrel having aperture means for receiving the cable passing through the sidewall passage of the side entry sub. The mandrel is moveable relative to the side entry sub under sufficient fluid pressure from an upper position to a lower position; latch means for latching the side entry sub to the release sub. When engaged by the mandrel in its lower position it releases the side entry sub from the release sub to enable the side entry sub to be pulled upward; and blockage means adapted to be lowered into the drill pipe from the surface into contact with the upper end of the mandrel for blocking flow through the mandrel. This enables fluid pressure to be applied through the drill pipe from the surface to the mandrel to move the mandrel to the lower position.

• Assignee: NOV; NOV-87-072060; EDB-87-146372
• Patent Number(s): US 4678038
• OSTI ID: 6151499
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
APERTURES
CABLES
CONDUCTOR DEVICES
CONNECTORS
DESIGN
DRILL PIPES
DRILLING EQUIPMENT
ELECTRIC CABLES
ELECTRICAL EQUIPMENT
EQUIPMENT
FABRICATION
FAILURES
FASTENERS
FASTENING
HOISTING
INSTALLATION
JOINING
MATERIALS HANDLING
NATURAL GAS WELLS
OIL WELLS
OPENINGS
PIPES
WELL LOGGING
WELL LOGGING EQUIPMENT
WELLS