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Drilling engineering petroleum engineering handbook vol 2
1.4 defines the upper limit of the ratio of effective maximum to effective minimum in- situ stress that is possible before triggering slip on a pre-existing, well-oriented fault.
The shaded region is the range of Fig.
1.6 Building the Geomechanical Model The elements of the geomechanical model that form the basis for analysis of wellbore stability are the state of stress (the orientations and magnitudes of the three principal stresses the pore pressure, and the rock properties, including strength (which can.
To consider the potential for wellbore failure when a wellbore is inclined to the principal stresses, it is necessary to take into account the magnitudes and the orientations of the princi- pal far-field stresses.Because the largest components of the stress field (gravitational loading and plate driving stresses) act over large areas, stress orientations and magnitudes in the crust are remarkably uniform (Fig.Manufactured in the United States of America.A low quality result has low maximum energy and very small anisotropy; a consistent orientation and low uncertainty are meaningless when this is the case.The Mohr-Coulomb criterion defines a linear relationship between the stress difference at fail- ure and the confining stress using two parameters: So, the cohesion (or Co, the unconfined Fig.Shallow density profiles can take many forms, and thus they ideally should be calibrated against in-situ log data or measurements of sample densities.This leads to a considerable reduction in leakoff pressure in a depleted reservoir and an increase in horizontal stress where pore pressure increases.II-30 Petroleum Engineering HandbookVol.
Mitchell 8 Introduction to Wellhead Systems - click to view Mike Speer 9 Cementing - click to view Ron Crook 10 Drilling Problems and Solutions - click to view.J.
The results, when careful filtering criteria are used, indicate that stress orienta- tions vary slowly with both speak now digital booklet depth and location.
These considerations can become very important when modeling and predicting how the wellbore will respond during and after drilling.Access IT Systems Books Petroleum Engineering Handbook: Drilling Engineering Vol.Thus, while there are some situations in which these tech- niques work, there are many pitfalls, and the results should be used hp probook 4530s usb 3.0 driver with caution.Anisotropic rocks will have Fig.Slip regime is indicated.Because the horizontal stress difference is smaller in a normal or reverse-faulting stress state than for a strike-slip stress state, tensile failure is less likely in these faulting regimes unless a wellbore is inclined.To first order, most rocks obey the laws of linear elasticity.One criterion to define the stress state at failure is the 2D linear Mohr-Coulomb criterion.The Modified Lade Criterion has considerable advantages, in that it, too, is a 3D strength criterion but requires only two empirical constants, equivalent to Co and.Because this is a two-dimensional (2D) illus- tration (for simplicity it is easiest to consider this sketch as a map view of vertical strike-slip faults.Specifically, the poros- ity and stress state will be in equilibrium and lie along a compactional end cap.