... ABSTRACT: A methodology for remote pore pressure prediction using seismic attributes is presented, based on rock physics responses to various overpressuring mechanisms. A series of laboratory acoustic tests were performed on reservoir sandstones and shales, simulating normal compaction...

... process and the well was completed successfully with minimal wellbore stability problems. 1. INTRODUCTION Traditional approaches to casing design and mud weight selection have typically been based on predicted pore pressures and empirically determined fracture gradients. The resulting mud weights...

... that serve as templates for construction of geomechanical models. When coupled with realistic rock properties, this mechanically valid forward model can be used to validate the geometric and kinematic restoration. The complete stress, strain, and pore pressure distribution from the geomechanical model can...

... and poromechanical processes play an important role in many geomechanics problems such as borehole stability analysis and studies of initiation and propagation of hydraulic fractures. Thermal effects, as well as poromechanical effects, can greatly change the stresses and pore pressure fields around an underground...

... ABSTRACT: In the fully-coupled thermoporoelastic wellbore stress modeling, pore pressure and temperature can be decoupled for a low-permeability shale and the decoupled equations can be solved analytically in the Laplace domain. For a high-permeability rock, such as sandstone or carbonate...

... measurements. This ratio is of importance in determining the failure mechanisms involved in sanding, fault reactivation, etc. 1. INTRODUCTION Production of hydrocarbons usually leads to changes in pore pressure which give rise to changes in stress acting on the reservoir and surrounding rocks [1]. A decrease...

... are healed. It has become clear that assessment of the in-situ stress state is very fundamental for all modelling work of borehole stability. Data used for stress modelling includes: Leak-Off Tests at each casing shoe (usually 3 in each well) pore pressure and overburden pre ssure, and lithology...

... & Gas pore pressure flow in porous media sand production particle capillary strength capillary force coefficient permeability proceedings water breakthrough chemical reaction Reservoir Characterization sandstone saturation Fluid Dynamics calculation relative permeability rock strength...

... ABSTRACT: We have proposed and studied a well-bore Stability model (a modified Failure Criterion), taking into account shale problems, effect of temperature, vibration of drill-string, drilling fluid jet impact, osmotic pressure, dynamic pore pressure ahead of the bit, and capillary pressure...

... the actual field data. We show (1) the effect of under-balanced mud weight which results in the well bore break-out, washout, and eccentricity at the bit and stabilizers and (2) how well bore break-out, washout, and eccentricity at the bit and stabilizers and the stresses due to unbalanced pore pressure...

...-wall of the field's growth fault system, pore pressures in the OI reservoir at the top of the structure are noticeably higher than porosity-based pressure predictions for the top seal. In addition, water phase pressures in the reservoir vary markedly from fault block to fault block, implying...

... ABSTRACT: Pre-drill pore pressure and fracture gradient predictions obtained from seismic velocity data are an important component of any well design. Although there are significant uncertainties associated with these analyses, few methods have been proposed to quantify them. We present here...

... ABSTRACT: The degree of certainty in pore pressure estimates from resistivity data is examined through a case study interpreted by eight trained analysts. The relevant data included resistivity, gamma ray, density, and mud weight as a function of depth. A shallow kick pressure and several...

... cavity Papamicho Upstream Oil & Gas analytical model pore pressure particle prediction Erosion process sand production test sand rate ARMA/NARMS 04-588 Modeling the Rate of Sand Production Fjær, E., Cerasi, P. and Li, L. SINTEF Petroleum Research, Trondheim, Norway Papamichos, P...

... media [6-10]. However, the prediction of pore pressure, stresses and deformations is usually obtained assuming some highly idealized pressure histories, either constant or changes in pressure following a step function (see e.g. Wang [11]). The actual boundary pressures and stresses encountered...

... ABSTRACT: It is well-established that stresses within and outside a petroleum reservoir change as a result of pore pressure depletion. This Paper describes possible consequences of these stress alterations, for reservoir compaction, for compaction drive, for permeability, for reservoir...

... permeability and fluid specific storage, depend on effective pressure. Effective pressure can be defined as P eff = P con - a P flu where P eff is the effective confining pressure, P con the external confining pressure, P flu the internal pore pressure, and a a poro-elastic multiplier termed the Biot...

... understood, but also might be very small for many of the depleting reservoirs. Reservoir Characterization depletion geomechanical model Upstream Oil & Gas pore pressure overburden geomechanics Reservoir Characteristic fingerprint Reservoir Conditions compressibility saturation change...

.... Deformations in a reservoir are induced by the changes of pore pressure and temperature due to fluid injection and production in thermal recovery processes, thereby affecting permeability. However, in the geomechanics and petroleum literature, the permeability change of reservoir formation subjected...

... the confining effective stresses around the well high enough to preclude rock failure. This can be achieved by at least three distinct manners. Firstly, by avoiding pore pressure increase due to fluid penetration, through the use high-entry pressure fluids, i.e., oil-based-like type of fluid. Secondly...