Method of preventing buckling in a drill string

Details Method of preventing buckling in a drill string Method of preventing buckling in a drill string

E - Fixed Constructions

21

B

255/1

E21B 47/02 (2006.01) E21B 47/12 (2006.01)

Patent

CA 1183516

A METHOD OF PREVENTING BUCKLING IN A DRILL STRING Abstract A method of preventing buckling of a drill string during drilling of a well in the earth comprises the steps of: (a) measuring the forces on, and the azimuth and inclination of, a segment of the drill string; (b) resolving said forces into the axial and normal components applied to the next shallower segment, said axial and normal components being related to measured azimuth and inclination of said segments; and (c) determining the buoyed weight, sliding friction, and external forces applied to said segment of said drill string. Steps (a), (b) and (c) are then repeated for successively shallower segments of said drill string and the resultant axial force on each segment of said drill string is compared with a buckling threshold to indicate when said resultant axial force on any segment exceeds said threshold.

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