| 主权项 |
1) A method of calculating principal horizontal stresses along a wellbore into a subterranean formation, comprising the steps of:
a) obtaining physical properties of said wellbore, said physical properties comprising one or more of density log, compressive and tensile rock strength, frictional strength of any discontinuity, wellbore path, position and type of wellbore failure, and mud weight; b) calculating a first horizontal stress based on at least one of said physical properties based on an assumption of frictional forces in the earth; c) calculating a second horizontal stress based on an assumption of a uniaxial elastic earth crust; d) comparing the first horizontal stress with the second horizontal stress; e) performing percentile filtering to assign a scaling factor; and f) calculating a third horizontal stress by applying said scaling factor based on both the frictional forces and the uniaxial elastic earth assumptions. |
