Down hole excitation system for loosening drill pipe stuck in a well
A method is described for freeing a section of drill pipe stuck in a well bore a substantial distance from the surface. The stuck section of pipe is connected to a drill string running to the surface. The method comprises determining the location of the stuck section of pipe; disengaging the drill string running to the surface from the stuck section of pipe at a predetermined distance above the point where the pipe is stuck; withdrawing the disengaged drill string from the bore hole, connecting an orbiting mass oscillator unit and drive means for such unit to the bottom end of the drill string withdrawn from the bore hole and to be reinstalled therein, connecting a grappling device for engaging the stuck section of drill pipe to the bottom of the oscillator unit; and lowering the drill string to be reinstalled along with the oscillator and grappling device into the well bore to effect the engagement of the grappling device with the stuck section of drill pipe.
- Assignee:
- NOV; EDB-87-115850; NOV-87-064826
- Patent Number(s):
- US 4667742
- OSTI ID:
- 6382159
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
ENERGY-LEVEL TRANSITIONS
EQUIPMENT
EXCITATION
FAILURES
FLUID FLOW
FREQUENCY DEPENDENCE
GRABS
HARMONICS
HOISTING
HOISTS
LIQUID FLOW
MATERIALS HANDLING
MATERIALS HANDLING EQUIPMENT
MECHANICAL VIBRATIONS
NATURAL GAS WELLS
OIL WELLS
OSCILLATIONS
PIPES
PRESSURIZING
WELL DRILLING
WELLS