Apparatus for vibrating a pipe string in a borehole

Patent · Tue Jan 02 04:00:00 EST 1990

OSTI ID:6915955

Worrall, R N; Stulemeijer, I P.J.M.

This patent describes an apparatus for vibrating a drill string having a central axis in a borehole. The apparatus comprising means for generating at a downhole location longitudinally directional vibrations along the central axis of the drill string in response to flow of fluid through the interior of the drill string and a shock absorbing element mounted in the drill string between the apparatus and a drill bit carried by the drill string effective to substantially isolate the drill bit from the vibration induced in the drill string. Also described is a method of feeding a drill string through a mon-vertical section of borehole comprising: generating a downhole location a longitudinally directional vibration along the central axis of the drill string by oscillating a body in a axial direction relative to the drill string in response to flow of fluid through the interior of the drill string. The vibrations preventing frictional sticking of the drill string against the borehole wall; isolating a drill bit at the end of the drill string from the effects of the vibration during drilling operations; and moving the pipe longitudinally in the borehole.

• Assignee: Shell Oil Co., Houston, TX
• Patent Number(s): US 4890682; A
• Application Number: PPN: US 7348186A
• OSTI ID: 6915955
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
DRILL PIPES
DRILLING EQUIPMENT
EQUIPMENT
EQUIPMENT PROTECTION DEVICES
FAILURES
MAINTENANCE
MATERIALS HANDLING EQUIPMENT
MECHANICAL VIBRATIONS
NATURAL GAS WELLS
OIL WELLS
PIPES
WELLS