pnt#nted at SPE meetings are subject to publicatan revlew by Editorial Committees of the Society of Petroleum Engineers Permission to copy IS rostmed to M abstract of not more than 300 words lllustratmns may not be copied The abstract should contain conspicuous acknowledgment of where and by whom the paper is presented Write Publicatmns Manager, SPE. P 0 Box 833836. The basic drill string mechanics implemented within the program, the overall algorithm, and the more pertinent modeling features which permit this level of analysis are briefly outlined. The implementation of these features and how they allow calculation of the response behavior of a bottom hole assembly are demonstrated.Although the development and enhancement of modeling capabilities within GEODYNZ is ongoing, it is anticipated that the preliminary verification results thus far generated will further the understanding of the response behavior of BHAs.
INTRODUCTION
This paper describes the initial development phase of a finite element computer program, GEODYN, capable of simulating the three-dimensional transient dynamic response of a polycrystalline diamond compact (PDC) bit interacting with a non-uniform formation. The ability of GEODYN to simulate response variations attributable to hole size, hole bottom surface shapes, and formation material non-uniformities is demonstrated. Planned developmental phases will address the detailed response of a bottom-hole assembly (BHA), a drill ahead (rock penetration and removal) simulation, and ultimately, the response of the entire string.
Plans are presented for conducting a field test of drill pipe corrosion, comparing air and nitrogen as drilling fluids. This test will provide data for evaluating the potential of reducing geothermal well drilling costs by extending drill pipe life and reducing corrosion control costs. Union Geothermal Company of New Mexico, a subsidiary of Union Oil Company of California, is participating by providing the drill rig, the well, and other support. Sandia National Laboratories is providing the nitrogen, recording the data, and assessing the results. The 10-day test will take place during fall 1980 at the Baca Location in Sandoval County, New Mexico.
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