Diamond Bit for Casing Drilling
The purpose of this project was to design a diamond bit that can drill the full hole using casing as the drill stem. At casing depth, the center of the bit is to be removed, the casing cemented in place and then a smaller bit used to drill out below the set casing. The project was suggested and supervised by Gary Collins, Conoco Oil Co. Jack Oldham of Hughes Christensen was to provide the design and construction of the cutting structure and Tommy Warren of Tesco Drilling Technology was to test a successful bit.
The design of the mechanism for the removal of the center portion of the bit was completed. In principle it consists of five splines with a means of holding the two parts in correct position with each other. Because of company commitments, the cutting structure design, the bit and the testing were not completed. Never the less the student’s design was completed and appears to be a very satisfactory solution to the problem that was submitted. The companys involved plan to pursue the design with construction and testing.