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1. (WO2014200416) ARRANGEMENT AND DOWN-THE-HOLE DRILLING EQUIPMENT FOR ANGULAR SETTING OF A DRILL STRING

Pub. No.:    WO/2014/200416    International Application No.:    PCT/SE2014/050672
Publication Date: Fri Dec 19 00:59:59 CET 2014 International Filing Date: Wed Jun 04 01:59:59 CEST 2014
IPC: E21B 7/08
E21B 31/14
Applicants: LKAB WASSARA AB
Inventors: LENNARTSSON, Erik
LUNDBORG, Markus
Title: ARRANGEMENT AND DOWN-THE-HOLE DRILLING EQUIPMENT FOR ANGULAR SETTING OF A DRILL STRING
Abstract:
The invention concerns an arrangement for the angular setting of a drill string (1) in a borehole, comprising a first tubular member (10) provided with a bottom motor (5) and drill bit (2), a second tubular member (11) attached at the drill string, the tubular members being united to each other through a rotatory hinge joint (12). For the efficient directional guidance of the drill string, the first and second tubular members (10, 11) have end sections (15a, 11a) that are taken up one inside the other and united by peg means (12) for pivoting around a first central point (A) of the longitudinal axes (z1, z2) of the two united tubular members, control and actuator means (30:1-30:4) that intersect in a second central point (B) and that are surrounded by a ring-shaped compartment that is limited between the tubular members. The control and actuator means (30:1-30:4) can be set by remote control means (40N 31 :1- 31 :4) and the relevant central axes of the tubular members (10, 11 ) can be caused to take up a pre-determined angular condition in a first setting angle (a) in an xz-plane; and a second setting angle (β) in a yz-plane; around the first central point (A) through selective change of the radially active lengths of the control and actuator means (30:1-30:4).