Abstract
Summary This paper describes a theoretical analysis of the penetration-cost objective function, specifically its first- and second-order differentiability, convexity, and feasibility, and presents the location and method of searching for the optimum drilling parameter. It discusses the features and practical significance of a combined isocost graph, such as determining the maximum economic results for each combination of bit weight and speed and providing a scientifically sound basis for modifying drilling parameters. This paper also gives a case study of the Zhong Yuan oil field.
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