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Chapter 5 Computer-aided casing design

1995; Elsevier BV; Linguagem: Inglês

10.1016/s0376-7361(06)80019-1

2212-0726

Eric Maidla, Andrew K. Wojtanowicz,

Reservoir Engineering and Simulation Methods

This chapter discusses the computer-aided casing design and addresses the optimization theory that results in assuring the selection of the cheapest combination casing string. After calculating the loads that the casing will be subjected to, the engineer is faced with the decision of selecting an appropriate casing grade, weight, and thread, such that these properties meet or exceed the calculated load conditions. The casing program of most oil wells represents the greatest single item of expense in well cost. In vertical wells, optimizing a combination casing string has been a challenge for casing designers. The optimization principle is based on considering the possibility of several combinations of grade, weight, thread, and smallest allowable section length that satisfy some predetermined external load condition. The lowest grade and weight casing, with the lowest possible values of mechanical strength, should give the lowest cost. The quick design charts allow for fast design of an entire combination casing string.