Abstract
Abstract It has been challenging to determine the magnitude of maximum horizontal stress in oil and gas reservoirs. A commonly used method of determining maximum horizontal stress is through the prediction of drilling-induced wellbore failures and matching them with observations. Wellbore failure prediction requires the calculation of near-wellbore stresses which are affected not only by the initial pore pressure and far-field stresses but also by the pressure and temperature in the wellbore. Poroelasticity and thermoelasticity are applied to investigate the impact of wellbore pressure and wellbore temperature on the distribution of near-wellbore stresses and wellbore failures. Equations of critical maximum horizontal stress for creating drilling-induced fracture and wellbore breakout, considering poroelastic effect, thermoelastic effect and uncoupled porothermoelastic effect are derived. These equations are used in two examples to illustrate how consideration of poroelastic, thermoelastic and porothermoelastic effects can help constrain the range of maximum horizontal stress. It is also demonstrated that wellbore stability in wellbores of different orientations can help constrain the range of rock strength and in-situ stresses.
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