Method and apparatus for restoring tubular upsets

Patent · Tue Jun 30 04:00:00 EDT 1987

OSTI ID:6311358

Gray, T R

This patent describes a joint extension for oil well drill pipe tubular members having enlarged diameter upset end portions carrying respectively pin and box threaded sections, comprising: a. an enlarged tubular body having an outer surface, a flow conveying bore, and the first and second male and female threaded respective pin and box portions at the ends; b. a first beveled peripheral annular shoulder on one end of the tubular body, extending radially from one of the threaded sections to the outer surface of the upset end portions; c. a second beveled peripheral annular surface extending from the upset end portion outer surface to the other of the threaded sections; d. one of the threaded sections being damaged in the thread area and with the damaged portion removed, the body member is provided with additional thread in the remaining upset portion; and e. a cooperating threaded extension member, including a cooperating annular shoulder that registers with the first annular shoulder upon assembly to close the bore to define an external recess. The external recess defines an annular weld groove that is sealed with a butt-type annular weld having an outer diameter substantially equal to the outer diameters of the engaged additional threaded end portion. The threaded extension member is at the upset portion.

• Assignee: NOV; NOV-87-071026; EDB-87-137682
• Patent Number(s): US 4676528
• OSTI ID: 6311358
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
42 ENGINEERING
420206 -- Engineering-- Mining & Drilling Equipment & Facilities-- (1980-1989)
DRILL PIPES
DRILLING EQUIPMENT
EQUIPMENT
JOINTS
OIL WELLS
PIPE JOINTS
PIPES
SEALS
THREADED JOINTS
TUBES
WELDED JOINTS
WELLS