Borehole drill pipe continuous side entry or exit apparatus and method

Patent · Tue Jul 21 04:00:00 EDT 1987

OSTI ID:6306253

Boyd, H

This patent describes a side entry sub for use in combination with a hydraulic pressure pack-off assembly for freeing a stuck drill pipe of a drill pipe string without disassembly of a top drive drilling motor assembly which comprises: a main body section; a main passage through the main body section off-center with respect to the center line of the main body section and of the same diameter as the inside diameter of the drill pipe; the main passage having upper and lower ends, the upper and lower ends provided with internal female pipe threads; a side entry passage in the main body section which intercepts the main passage and extends in the same direction as the main passage at an angle of about 6 1/2 degrees relative to the main passage and of a smaller diameter than the main passage, the side entry passage having an outer end with internal female pipe threads; a short pipe section having a length of from about 17 inches to about 20 inches secured to each pipe threaded end of the main passage in the main body section in which the short pipe section includes pipe threads on the outer surface of each end to assume a greater amount of wear during use than the main body section and which is replaceable when worn; and an adapter having male pipe threads on its outer end surfaces secured to the side entry passage and to which the hydraulic pressure pack-off assembly is secured.

• Assignee: Boyd's Bit Service, Inc., Lake Charles, LA
• Patent Number(s): US 4681162
• OSTI ID: 6306253
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
42 ENGINEERING
420206 -- Engineering-- Mining & Drilling Equipment & Facilities-- (1980-1989)
DRILL PIPES
DRILLING EQUIPMENT
EQUIPMENT
FAILURES
HOISTING
HYDRAULIC EQUIPMENT
INCIDENCE ANGLE
JOINTS
MATERIALS HANDLING
MOTORS
NATURAL GAS WELLS
OIL WELLS
PACKINGS
PIPES
THREADED JOINTS
WELLS