One of the most challenging drilling problems encountered in the Western Overthrust belt occurs in the deep Jurassic Preuss salt. A l)istory of lost holes caused by stuck drillstrings, stuck casing, and collapsed casing plagues operators in the Wyoming/Utah Overthrust belt. An ongoing engineering study is being conducted to identify the problem salt-drilling areas and to solve the associated drilling and casing-collapse problems.In the first part of this study, completed in June 1983, salt-drilling problems were studied in the Anschutz Ranch East field. Problem intervals within the salt section were identified, and unique salt-drilling techniques were developed. As a result of implementation of the salt-drilling techniques, salt-drilling success in Anschutz Ranch East has improved substantially.Included in this study are an evaluation and recommendations for mud systems, bottomhole assemblies (BHA's), drilling parameters, and caliper logging through the salt interval. Casing collapse caused by nonuniform loading is discussed, and preventive measures are recommended.
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