Society of Petroleum Engineers (SPE) May 23, 2016 In this paper, we have conducted a systematic investigation of the major parameters which affect WBS treatment in permeable formations. Large-scale fracturing experiments were conducted on two rock types with significantly different permeability and stiffness: Berea sandstone (stiff - moderately permeable) and Castlegate sandstone (weak - highly [...]
American Association of Drilling Engineers (AADE) April 12, 2016 Fluid-shale compatibility testing is as old as the drilling fluid industry itself. When drilling fluids started to be deliberately used for hole-making, the (in-)compatibility of these fluids with clay-rich shale formations became immediately apparent, and industry scientist have been trying to make sense of it all [...]
Society of Petroleum Engineers (SPE) February 9, 2016 This paper covers the methodology to derive all geomechanical properties (Young's modulus, Poisson's ratio and vertical/horizontal variable Biot constants as a function of rock type) for 13 different stress models. Minimum horizontal stress (Sh) is a key parameter controlling fracture height growth during hydraulic fracturing simulation. Assuming [...]
Society of Petroleum Engineers (SPE) September 28, 2015 In this paper, an experimental technique to study WBS under realistic conditions is introduced, and the results of a series of larger-scale fracturing experiments using this technique are presented. The experimental set-up described here consists of a dual flow-loop/ pressure-intensifying system to carry out high-pressure borehole fracturing [...]
American Rock Mechanics Association June 28, 2015 Knowledge of Biot poroelastic coefficient is crucial to geoscientists for a number of applications, including oil and gas exploration and production, and hydrogeology. This in turn requires estimation of bulk and grain modulus or compressibility. Although bulk modulus estimation is a standard laboratory method for shale, no effort was [...]
American Rock Mechanics Association (ARMA) June 28, 2015 Integration of geomechanics test results with well log measurements is a crucial step in developing geomechanical models to estimate in situ stress state, maintaining stable wellbore and design hydraulic fracture. Limited availability of core material severely restricts design of a comprehensive geomechanics test program. Sidewall core plugs, [...]
American Rock Mechanics Association June 28, 2015 Fracturing experiments were conducted on cylindrical Berea sandstone samples using Synthetic-Based Mud (SBM) with a new experimental set-up (UT Mudfrac). Several injection cycles were carried out on each rock sample to measure the Fracture Initiation Pressure (FIP) and the stable Fracture Propagation Pressure (FPP) at various confining pressures. [...]
ARMA 15- 767 June 1, 2015 The understating of rocks mechanical properties as a function of stress is required for many geomechanics applications. One is to estimate friction angle and cohesion values to describe the shear strength vs. normal stress over the normal-load range. It is facilitated in the laboratory measurement using Single Stage Triaxial [...]
Society of Petroleum Engineers (SPE) April 1, 2014 Novel apparatuses have been developed to measure permeability using steady- and unsteady- state methods on nano-Darcy (nD) shale (source rock) using intact cylindrical samples returned to isostatic effective reservoir stress. The steady-state method uses a high pressure dual pump system using supercritical fluids. High pressure supercritical fluids [...]
American Rock Mechanics Association June 23, 2013 Solution to the anisotropic stress equation evolved from Eaton [6] requires knowledge of horizontal and vertical elastic properties. Its application to derive a general well log based acoustic model is facilitated using laboratory acoustic measurements at horizontal, vertical, and 45 degree orientation. However, obtaining 45 degree samples are [...]