Halliburton Energy Services, Inc.

Valérie Sillen

Philippe Fanuel

Olivier Mageren

Jean-Pierre Lassoie

Nuno Da Silva

Nicolas Luyckx

A matrix drill bit and method of manufacturing a matrix bit having back raked cutting elements is disclosed. In one aspect, a matrix drill bit for well drilling includes a matrix bit body that has a front area in a direction of drilling and two or more diamond impregnated cutting blades protruding from the front area of the matrix bit body. The cutting blades each have a front external surface protruding from the front area of the matrix bit body and present a plurality of back raked downhole interface surfaces in the direction of drilling. The downhole interface surfaces span a leading face and a trailing face where the leading face extends to a first height and the trailing face extends to a second height and the first height is greater than the second height.

Matrix drill bits with back raked cutting elements

An underreaming tool may include a tubular body, a drive tube, at least one blade element ('the blade element'), at least one wedge element ('the wedge element'), and a stop mechanism. The drive tube may include at least one longitudinal groove (&#x201c;the longitudinal groove&#x201d;) axially disposed along a length of the drive tube. The wedge element may include a first side having at least one lateral projection (&#x201c;the lateral projection&#x201d;) configured to axially slide into the longitudinal groove to couple the wedge element to the drive tube. The stop mechanism comprises a threaded sleeve configured to screw onto the drive tube to lock the wedge element in the longitudinal groove once the lateral projection is slid into the longitudinal groove.

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Forest, Belgium

Valérie Sillen