Todd J Bielawa

US Patent:

20100206638, Aug 19, 2010

Filed:

Feb 13, 2009

Appl. No.:

12/370766

Inventors:

Todd Bielawa - Hartland WI, US
James Schulz - Sullivan WI, US

International Classification:

E21B 10/08
E21B 10/20

US Classification:

175356

Abstract:

An improved hole opener assembly for horizontal drilling is disclosed that is less prone to failure as a result of cone arm break out or pocket side wall fracture. The interface between the cone arm and the pocket employs a key and slot configuration with a tighter fit than between the arm and the pocket to reduce the stress on the pocket side wall during drilling.

US Patent:

20190178037, Jun 13, 2019

Filed:

Dec 13, 2017

Appl. No.:

15/840489

Inventors:

- Sussex WI, US
Todd Bielawa - Hartland WI, US

International Classification:

E21B 10/25
E21B 10/62

Abstract:

A cone arm assembly comprises an arm having a shaft extending therefrom in which the shaft is angularly surrounded by a shoulder surface on one end thereof. A cone has a recess formed therein which receives the shaft in a manner to permit a rotation of the cone relative to the shaft about a rotational axis. The cone has a base surface facing the shoulder surface of the arm. A first seal element is positioned within the recess and forms a first seal between the shaft of the arm and the cone. A second seal element is positioned within the recess and forms a second seal between the shaft of the arm and the cone. The second seal is positioned closer to the shoulder surface than the first seal. A third seal element forms a third seal between the base surface of the cone and the shoulder surface of the arm.