Accurate In-Situ Stress Measurements During Drilling Operations

Abstract

Abstract This paper describes easily implemented field procedures for obtaining in situ horizontal earth stresses during drilling operations. The procedures were developed to obtain stress data that are necessary for wellbore stability modeling and for predicting and avoiding fracturing lost returns. Conventional leakoff tests are performed routinely to test the integrity of casing cement jobs, not to accurately measure earth stresses. The most important consideration was to develop methods that were easy to implement and would minimize disturbance to drilling operations, thereby promoting acceptance among operations personnel. The procedures are called Extended Leakoff Tests (XLOT).