This approach is applied to constrain the magnitude of the maximum horizontal stress at some interest depths (3900 m, 4100 m, 4300 m and 4500 m) of the basement reservoirs at the White Tiger field, Cuu Long basin, Vietnam from the program STRESS POLYGON. The occurrence of DITFs and/or BOs proved to be useful in estimating stresses around the wellbore, especially the maximum horizontal stress magnitude. | Tạp chí Phát triển Khoa học và Công nghệ, tập 20, số K4-2017 39 An approach to constrain maximum horizontal stress magnitude using wellbore Failure observations from image logs Do Quang Khanh Abstract—The magnitude of the maximum horizontal stress is generally the most challenging term in estimating the full stress tensor. In this paper, an approach to constrain the magnitude of the maximum horizontal stress using the frictional limits to stress and wellbore failure observations (drillinginduced tensile fractures DITFs and/or breakouts BOs) from image logs is presented. This approach is applied to constrain the magnitude of the maximum horizontal stress at some interest depths (3900 m, 4100 m, 4300 m and 4500 m) of the basement reservoirs at the White Tiger field, Cuu Long basin, Vietnam from the program STRESS POLYGON. The occurrence of DITFs and/or BOs proved to be useful in estimating stresses around the wellbore, especially the maximum horizontal stress magnitude. Index Terms—Maximum horizontal stress, frictional limits to stress, wellbore failures, drillinginduced tensile fractures, breakouts. 1 INTRODUCTION K nowledge of in-situ stress is an important issue for understanding of many processes in both science and engineering problems such as geology, geophysics, earthquake, civil, mining and petroleum development. It is also a key parameter for the petroleum exploration and production activities such as drilling borehole stability, hydraulic fracture stimulation, reservoir drainage and flooding patterns, subsurface fluid transport, storage and extraction of oil and gas from the subsurface [1, 6]. The state of in-situ stress is described by a stress tensor including the magnitudes and orientations Manuscript Received on August 7th, 2017. Manuscript Revised December 25th, 2017 This research is funded by Ho Chi Minh City University of Technology – VNU-HCM, under grant number C2017-20-24. Do Quang Khanh - Faculty of Geology and Petroleum Engineering,
