Research Papers: Petroleum Engineering

Relative Significance of Multiple Parameters on the Mechanical Specific Energy and Frictional Responses of Polycrystalline Diamond Compact Cutters

[+] Author and Article Information
Babak Akbari

Department of Petroleum Engineering,
The University of Tulsa,
204D, 2450 E. Marshall Street (North Campus),
Tulsa, OK 74110
e-mails: babak-akbari@utulsa.edu;

Stefan Z. Miska

The University of Tulsa,
207D, 2450 E. Marshall Street (North Campus),
Tulsa, OK 74110
e-mail: stefan-miska@utulsa.edu

1Present address: Craft and Hawkins Department of Petroleum Engineering, Louisiana State University, Old Forestry Building, Room 125, Baton Rouge, LA 70803.

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received April 15, 2016; final manuscript received July 12, 2016; published online August 17, 2016. Assoc. Editor: Egidio Marotta.

J. Energy Resour. Technol 139(2), 022904 (Aug 17, 2016) (7 pages) Paper No: JERT-16-1174; doi: 10.1115/1.4034291 History: Received April 15, 2016; Revised July 12, 2016

A high pressure single polycrystalline diamond compact (PDC) cutter testing facility was used to investigate the effect of five factors on PDC cutter performance on Alabama marble. The factors include: depth of cut (DOC), rotary speed, back rake angle, side rake angle, and confining (wellbore) pressure. The performance is quantified by two parameters: mechanical specific energy (MSE) and friction angle. Fractional factorial design of experiments methodology was used to design the experiments, enabling detection of potential interactions between factors. Results show that, in the range tested, the only statistically significant factor affecting the MSE is DOC. In other words, DOC's influence is predominant and it can mask the effect of all the other factors. These results could have applications in real time pore pressure detection. Further, the results show that back rake angle is the most statistically significant factor in friction angle. Side rake angle and depth of cut also affect the friction angle, but in a relatively unimportant manner. The MSE–DOC behavior is explained and modeled by cutter edge–groove friction and the circular cutter shape. It is speculated that high cutter edge friction overwhelms the actual cutting process. A comparison of five currently present models in the literature with these results is presented and the conclusion is that the future PDC cutter models should digress from the traditional shear failure plane models.

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Fig. 1

High pressure single PDC cutter testing facility schematic

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Fig. 2

Built-up edge of Alabama marble

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Fig. 3

A schematic instance of PDC cutter with high and low DOC and the associated difference in the importance of wall friction

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Fig. 4

MSE versus depth of cut for the geometric model and data reported by Ref. [6]




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