Full hole drill collar

Details Full hole drill collar Full hole drill collar

E - Fixed Constructions

21

B

76/20, 255/28

E21B 17/10 (2006.01) E21B 17/16 (2006.01)

Patent

CA 1155436

-28- "FULL HOLE DRILL COLLAR AND METHOD OF PRODUCING SAME" ABSTRACT OF THE DISCLOSURE A drill collar or stabilizer consists of a cy- lindrical element sized just under the diameter of the drill hole and is situated either immediately above the drill bit or at spaced intervals thereabove depending upon circumstances. A drilling mud or fluid feed bore is form- ed axially through the collar and a plurality of return drilling mud or fluid apertures extend through the length of the collar between the outer wall thereof and the wall defining the centrally located feed bore spaced and parallel therefrom.

359747

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