EXTRAPOLING CPTU DATA IN OFFSHORE FIELDS

Abstract

Laying of the conductor casing is part of the early stages of well designs. Piezocone Penetration Test (CPTu) is a test used in situ to determine geotechnical properties and evaluate stratigraphy parameters, i.e. undrained shear strength and specific weight. This test generally obtains parameters up to a depth of approximately 40 meters. However, since conductor casing can reach up to 100 meters, it is necessary to estimate data outside the CPTu test domain during the design phase. This study involves analyzing methodologies to estimate geotechnical parameters of clayey soil at depths beyond known data domain. Applicability of these methods can help the decision-making process of a well design, accelerate the construction phase, and contribute to structural integrity. Results verify and describe the efficiency of the methods in estimating geotechnical parameters in the early stages of well installation.