Abstract
Summary This paper presents the method and results of a borehole-stability analysis conducted on the first horizontal well successfully drilled in the North Valiant field in the Southern North Sea. Previous drilling data obtained from the same area were analyzed by numerical simulations of potential mechanical behavior of the wellbore. The magnitude of the in-situ horizontal stresses was determined by the analysis of fracture-stimulation data from wells in the fields. The directions of the stresses were derived from anelastic-strain-relaxation (ASR) measurements of fresh cores. Effects of hole azimuth on wellbore stability were evaluated. The analysis resulted in a design of optimum mud weights for maintaining borehole stability during drilling. This paper also discusses field results and well completions.
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