Inventors:
Lane P. Skyles - Houston TX
Billy L. Carwile - Deer Park TX
William L. May - Houston TX
Assignee:
Schlumberger Technology Corp. - Sugar Land TX
International Classification:
E21B 1016
US Classification:
175336, 1754201, 175428, 175430
Abstract:
Disclosed is a wear resistant cutting insert for use in rolling cutter drill bits. The insert has a cylindrical shank that is readily fitted in an interfering manner into cylindrical sockets formed in the rolling cutter. The surface of die insert that engages the formation, however, is none-circular, and preferably, oval shaped. To prevent the insert from turning in the socket, a shallow counterbore is formed about the socket that accommodates the shape of the top, non-cylindrical portion of the insert. The depth of the recess is made slightly greater than the length of the shank of the insert so that the load applied to insert during operation is not transmitted through the shank to the bottom of the socket in the cutter.