Drill string

Details Drill string Drill string

Category

E - Fixed Constructions

Subcategory

21

Subsubcategory

B

CPC

255/24, 255/56

IPC codes

E21B 17/00 (2006.01)

Type

Patent

Patent number

CA 1101407

Description

Abstract of the Disclosure A drill string comprising first and second drill members which are threadedly engaged with each other. Each drill string member has an elongated body and a helical thread on the elongated body. The thread may be roll formed. The helical thread has a helical root portion, a helical crest portion and flank portions interposed between the root portion and the crest portion. The helical crest portion has a maximum radial projection adjacent the flank portions. The helical crest portion has a recess with the maximum depth thereof preferably disposed generally midway between the lateral extremities of the crest portion. The recess may be generally V- shaped and has a maximum depth of about 0.003 to 0.030 inch. In one embodiment, the sidewalls define an angle of about 2 to 20 degrees with respect to a plane passing transversely through the lateral edges of the crest.

Application Number

326882

Affiliated with

Also associated with

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