A program to calculate the state of stress in the vicinity of an inclined borehole through an anisotropic rock formation

Published on Sep 1, 2019in Geophysics2.928
路 DOI :10.1190/GEO2018-0097.1
Wei Li3
Estimated H-index: 3
(China University of Geosciences (Beijing)),
Douglas R. Schmitt33
Estimated H-index: 33
(U of A: University of Alberta)
+ 1 AuthorsChangchun Zou14
Estimated H-index: 14
(China University of Geosciences)
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Abstract
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References60
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#1Maria Sarah TibboH-Index: 1
#1Wei Li (China University of Geosciences)H-Index: 2
#2Douglas R. Schmitt (U of A: University of Alberta)H-Index: 33
Last. Xiwei Chen (U of A: University of Alberta)H-Index: 3
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Abstract We provide a program (AOTI2D) to model responses of ultrasonic pulse transmission measurements through arbitrarily oriented transversely isotropic rocks. The program is built with the distributed point source method that treats the transducers as a series of point sources. The response of each point source is calculated according to the ray-tracing theory of elastic plane waves. The program could offer basic wave parameters including phase and group velocities, polarization, anisotropic...
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#1Tianshou Ma (CAS: Chinese Academy of Sciences)H-Index: 17
#2Qianbing Zhang (Monash University)H-Index: 27
Last. Jian Zhao (Monash University)H-Index: 68
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Abstract Fracture pressure is one of the most important foundations of drilling engineering, and the anisotropy of tensile strength is also a distinct feature of layered formations, but the anisotropy of tensile strength has seldom received attention in the analysis of fracture pressure. In the present paper, a novel fracture pressure model was proposed for inclined wells in layered formations with anisotropic rock strengths. Firstly, the characteristics of anisotropic tensile strength were inve...
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#1Oliver N. Ong (U of A: University of Alberta)H-Index: 3
#2Douglas R. Schmitt (U of A: University of Alberta)H-Index: 33
Last. Kristine Haug (Alberta Geological Survey)H-Index: 8
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Optimizing the productivity of nonconventional, low-permeability 鈥渟hale鈥 reservoirs requires detailed knowledge of the mechanical properties of such materials. These rocks鈥 elastic anisotropy is acknowledged but usually ignored due to difficulties in obtaining such information. Here we study in detail the dynamic and static elastic properties of a suite of calcareous mudstones from the nonconventional Duvernay reservoir of Alberta, Canada. The complete set of transversely isotropic elastic const...
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#1Liu Ming (Georgia Institute of Technology)H-Index: 1
#2Yan Jin (China University of Petroleum)H-Index: 29
Last. Xiaoning YuH-Index: 1
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To analyse wellbore stability phenomena when drilling through a transversely isotropic formation such as shale, a wellbore stability model is developed based on the coordinate transformation method and complex variable elasticity theory. In order to comprehensively consider the anisotropies in the transversely isotropic formation, the model includes the followings: 1. the elastic anisotropy due to the sedimentation effect and naturally developed fractures and 2. the strength anisotropy due to th...
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#1Jaime Mel茅ndez-Mart铆nez (U of A: University of Alberta)H-Index: 4
#2Douglas R. Schmitt (U of A: University of Alberta)H-Index: 33
ABSTRACTWe obtained the complete set of dynamic elastic stiffnesses for a suite of 鈥渟hales鈥 representative of unconventional reservoirs from simultaneously measured P- and S-wave speeds on single prisms specially machined from cores. Static linear compressibilities were concurrently obtained using strain gauges attached to the prism. Regardless of being from static or dynamic measurements, the pressure sensitivity varies strongly with the direction of measurement. Furthermore, the static and dyn...
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#1Kang Duan (HKU: University of Hong Kong)H-Index: 16
#2Chung Yee Kwok (HKU: University of Hong Kong)H-Index: 21
The aim of this study is to better understand the mechanisms controlling the initiation, propagation, and ultimate pattern of borehole breakouts in shale formation when drilled parallel with and perpendicular to beddings. A two-dimensional discrete element model is constructed to explicitly represent the microstructure of inherently anisotropic rocks by inserting a series of individual smooth joints into an assembly of bonded rigid discs. Both isotropic and anisotropic hollow square-shaped sampl...
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#1Douglas R. Schmitt (U of A: University of Alberta)H-Index: 33
Seismic velocities are usually considered to be seismic properties. In the Earth's upper crust, however, these are influenced strongly by confining stresses, pore pressures, fluid saturations, temperature, and porosity, to name only a few. This contribution focuses on how these different factors interact to result in a seismic velocity that will be finally observed. The components of a rock 鈥 its minerals, saturating fluids, and solid frame 鈥 are described in terms of their fundamental elastic m...
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#1Xinding Fang (MIT: Massachusetts Institute of Technology)H-Index: 14
#2Arthur Cheng (NUS: National University of Singapore)H-Index: 12
Last. Michael Fehler (MIT: Massachusetts Institute of Technology)H-Index: 40
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Crossover of the dispersion of flexural waves recorded in borehole cross-dipole measurements is interpreted as an indicator of stress-induced anisotropy around a circular borehole in formations that are isotropic in the absence of stresses. We have investigated different factors that influence flexural wave dispersion. Through numerical modeling, we determined that for a circular borehole surrounded by an isotropic formation that is subjected to an anisotropic stress field, the dipole flexural d...
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#2Kaiyuan Liu (CNPC: China National Petroleum Corporation)H-Index: 2
Abstract The mode-I fracture toughness is of great significance for evaluating the fracturing ability of shale reservoirs. In this study, the mode-I fracture toughness of the shale in the Lower Silurian Longmaxi Formation, Southern Sichuan Basin was determined with the Cracked Chevron Notched Brazilian Disc (CCNBD). Based on the experimental data, the relationships among the mode-I fracture toughness, the density, the acoustic time and the clay mineral content were analyzed. The shale samples fo...
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#2Tiffany Playter (Alberta Geological Survey)H-Index: 5
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#2Junxing Cao (CDUT: Chengdu University of Technology)H-Index: 12
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#1Jingxuan ZhangH-Index: 2
#2Liu XiangjunH-Index: 2
Last. Li WeiH-Index: 2
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Hydraulic fracture dimension is one of the key parameters affecting stimulated porous media. In actual fracturing, plentiful uncertain parameters increase the difficulty of fracture dimension prediction, resulting in the difficulty in the monitoring of reservoir productivity. In this paper, we established a three-dimensional model to analyze the key factors on the stimulated reservoir volume (SRV), with the response surface method (RSM). Considering the rock properties and fracturing parameters,...
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