... and compressibility of the reservoir formation are constant or a function of pore pressure. This assumption has limitations when applied to an oil sands reservoir because of the unconsolidated deformable nature of oil sands. Three injection tests were conducted in an oil sands reservoir at a depth of about 500 m...

... the original triaxial stress field is replaced by a fluid pressure typically lower than any of the stresses in the original rock coloum, and slightly above the static pore pressure at each depth. The rock surrounding the borehole is subjected to a sudden stress concentration and may fail, depending on several...

... as: Equation (1) (Available in full paper) where σ is the total stress, and p is the pore pressure. The sign convention here is negative for tension and positive for compression. The pore pressure is always positive. In field practice, the injection pressure (or pore pressure) at bottom hole is estimated...

... recovery operations this pore system is filled with an intertwined volume of water and hydrocarbons at some pressure roughly correlated with the depth of burial. Recovery operations change this pore pressure by injection or withdrawal of fluids from wells penetrating the reservoir. The burial history...

... of Colorado shale near a cased wellbore due to heating. The temperature, pore pressure and stresses response in Colorado shale near a cased wellbore due to heating are analyzed using a coupled thermal-mechanical-hydraulic solution. The possibility of failure or fracturing of the shale due to heating...

... formations are strongly dependent on the formation's mechanical and thermal characteristics which are influenced by changes in temperature, pore pressure and stress slate. In order to analyze and understand lhe field seismic data, the influence of temperature, pore pressure and compressional and shear...

... Abstract Formation pore pressure determinations from log properties in carbonate environments has always been a difficult task. They do not compact uniformly with depth as do shale's, nor is it necessarily true for the fluids to be in support of the overburden when abnormally pressured...

... are created when gas enters the slurry before cement is fully set or when severe chemical contraction takes place after the cement is set 3 . During the cement placement, application of 2 to 3 KPa/m excess pressure gradient above the gas pore pressure gradient will prevent gas entry into the cement slurry...

... present a sensitivity analysis of important factors, including wellbore pressures, reservoir pore pressure and stress, and material properties (intact and yielded). Introduction Borehole stability is an important issue in the petroleum industry; its effect on drilling budgets is significant [Woodland...

... prospects are most attractive considering current upstream economics. Pore pressure analysis is the initial, and in most cases, the most important step in developing an accurate, complete well program. Casing setting depths, hole sizes, number of casing strings, mud programs, and hydraulics are examples...

... Abstract Formulations for the magnitude of excess pore pressure and change in effective stress developed In gassy soils due to temperature change, and the finite element methodology adopted to incorporate these effects, are described. Application of the model to simulate the s team injection...

... Abstract A design method for injection pressures to preclude formation shearing is presented. The elements of the procedure are: determine the maximum and minimum principal stresses; postulate a reasonable shear yield criterionfor the reservoir mass; ca1culate the pore pressure conditions...