Matthew J. Stahl Texas A&M University-Ocean Drilling Program College Station, Tex. A method for quickly calculating critical drillstring loads and the stresses produced by axial loads and bending helps determine optimum drillstring configuration. The Ocean Drilling Program (ODP), operated by Texas A&M University, has developed a procedure to design long drillstrings quickly and consistently. Such extremely long, complex drillstrings are used in deepwater drilling operations. The ODP's subsea drilling and coring operations use tapered drillstrings up to 30,000-ft long. The ODP carries out these operations without a riser, f...

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