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...Rock strength from log parameters An understanding of ...rock strength is important for designing recovery plans for a reservoir and for developing an appropriatereservoi...r simulation. A detailed discussion of rock failure can be found in...
An understanding of rock strength is important for designing recovery plans for a reservoir and for developing an appropriatereservoir simulation. A detailed discussion of rock failure can be found inRock failure relationships and Compressive strength of rocks. But the data needed for these methods may not be readily available, so there is a desire to use data available from well logs that are available. Several techniques have been proposed for deriving rock strength from well log parameters. Coates and Denoo[1] calculated stresses induced around a borehole and estimated failure from assumed linear envelopes with strength parameters derived fromshear and compressional velocities.
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...Compressive strength of rocks Mechanical failure in rocks generally means either fracturing or permanent deformation a...ile many methods for calculating failure relationships exist, an initial measure of the compressive strength of reservoir rocks is still needed for use in those calculations. Contents * 1 Estimating compre...ssive strength * 1.1 Relating compressive ...
Mechanical failure in rocks generally means either fracturing or permanent deformation as a result of compression. While many methods for calculating failure relationships exist, an initial measure of the compressive strength of reservoir rocks is still needed for use in those calculations. General rock failure criterion can be reduced to a few parameters dependent on lithology (m) and the uniaxial compressive strength (C0). Lithology is commonly derived during log analysis, som may be estimated (Table 1)[1]. What is needed still is an initial measure of rock strength provided byC0.
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...Category:1.2.3 Rock properties . Pages in category "1.2.3 ...Rock properties" The following 19 pages are in this category, out of 19 total. C * Compressive ...strength of rocks E * Estimating mechanical properties with seismic * Estimating permeability considerin...
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...Predicting rock properties Many theoretical models have been developed to predict or correlate specific physical ...properties of porous rock. Most theoretical models are built on simplified physical concepts: what are the properties of an i...they must be, to be solvable). Most of these models are capable of "forward modeling" or predicting rock properties with one or more arbitrary ...
Many theoretical models have been developed to predict or correlate specific physical properties of porous rock. Most theoretical models are built on simplified physical concepts: what are the properties of an ideal porous media. However, in comparison with real rocks, these models are always oversimplified (they must be, to be solvable). Most of these models are capable of "forward modeling" or predicting rock properties with one or more arbitrary parameters. However, as is typical in earth science, models cannot be inverted from measurements to predict uniquely real rock and pore-fluid properties.
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...Pore fluid effects on rock mechanics Fluids can alter ...rock mechanical properties through: * Fluid pressure * Chemical reactions with mineral surface * Lubr...s page will concentrate on the role of water and, in particular, how water saturation can influence rock strengths measured in the laboratory or derived ...
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... page provides an introduction to stress-strain relationships. They form the foundation for several rock properties such as elastic moduli (incompressibility), effective media theory, elastic wave velocit...y, and rock strength. Contents * 1 Defining stress and pressure * 1.1 Standard stress conditions * 1.2 Types of pre..., (b) tensile, (c) general with normal and tangential components, and (d) shearing stress (modified from Hubbert[1]). * Fig. 2– Stresses acting on the elemental cube. The stresses must be balanced so th...
This page provides an introduction to stress-strain relationships. They form the foundation for several rock properties such as elastic moduli (incompressibility), effective media theory, elastic wave velocity, and rock strength. Stress is the force per unit area. The metric units of stress or pressure are N/m2 or Pascals (Pa). Other units that are commonly used are bars, megapascals (MPa), and lbm/in.2 These are illustrated in Figure 1[1].
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...PEH:Rock Properties Publication Information Petroleum Engineering Handbook Larry W. Lake, Editor-in-C...ngineering John R. Fanchi, Editor Copyright 2007, Society of Petroleum Engineers Chapter 13 – Rock Properties M. Batzle, Colorado School of Mines, D.-H. Han, U. of Houston, and R. Hofmann, Colorad...BN 978-1-55563-108-6 Get permission for reuse Contents * 1 Introduction * 1.1 Knowledge of Rock Properties Is Largely Empirical * 1.2 Philosophy for ...
Rock and fluid properties provide the common denominator around which we build the models, interpretations, and predictions of petroleum engineering, as well as geology and geophysics. We consider here the properties of sedimentary rocks, particularly those that make up hydrocarbon reservoirs. Usually, these consist of sandstones, limestones, and dolomites. We must be more inclusive, and consider rocks such as shales, evaporates, and diatomites because these provide the seals, bounding materials, or source rocks to our reservoirs. It is important to note that shales and claystones make up the most abundant rock type in the typical sedimentary column.
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...Rock mechanical properties The determination of a reservoir's mechanical properties is critical to red...ucing drilling risk and maximizing well and reservoir productivity. Estimates of rock mechanical properties are central to the following[1]: * Drilling programs * Well placement * We...ustic logging can provide information helpful to determining the mechanical properties of reservoir rock. Contents * 1 Mechanical properties of ...
The determination of a reservoir's mechanical properties is critical to reducing drilling risk and maximizing well and reservoir productivity. Acoustic logging can provide information helpful to determining the mechanical properties of reservoir rock. Mechanical properties include: * Elastic properties (Young's modulus, shear modulus, bulk modulus, and Poisson's ratio) [SeeStress strain relationships in rocks for calculations of these properties] * Inelastic properties (fracture gradient and formation strength) Elasticity is the property of matter that causes it to resist deformation in volume or shape. Hooke's law describes the behavior of elastic materials and states that for small deformations, the resulting strain is proportional to the applied stress. Depending on the mode of the acting geological force and type of geological media the force is acting upon, three types ofdeformation can result as well as three elastic moduli that correspond to each type of deformation.
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...l Engineering John R. Fanchi, Editor Copyright 2007, Society of Petroleum Engineers Chapter 13 – Rock Properties M. Batzle, Colorado School of Mines, D.-H. Han, U. of Houston, and R. Hofmann, Colorado... School of Mines ISBN 978-1-55563-108-6 Get permission for reuse Rock and fluid properties provide the common denominator around which we build the models, interpretatio...cks to our reservoirs. It is important to note that shales and claystones make up the most abundant rock type in the typical sedimentary column. Features such as seismic signature depend as much on the en...
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...Stress impact on rock properties Understanding ...rock properties and how they react under various types of stress is important to development of a geomec...hanical model before drilling. Some major geomechanical rock properties are described below. Contents * 1 Deformation of rocks -- elasticity * 1.1 Stress-st...
Understanding rock properties and how they react under various types of stress is important to development of a geomechanical model before drilling. Some major geomechanical rock properties are described below. Penetrometer testing * 3.3 Estimating strength parameters from other data * 4 Nomenclature * 4.1 Subscripts * 5 References * 6 Noteworthy papers in OnePetro * 7 External links * 8 See also * 9 Page champions * 10 Category To first order, most rocks obey the laws of linear elasticity. In other words, the stress required to cause a given strain, or normalized length change (Δlk /ll), is linearly related to the magnitude of the deformation and proportional to the stiffnesses (or moduli), Mijkl. Furthermore, the strain response occurs instantaneously as soon as the stress is applied, and it is reversible--that is, after removal of a load, the material will be in the same state as it was before the load was applied.
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