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Now showing items 1-10 of 13
An integrated well data analysis for in-situ stress estimation
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2003)
In this paper we obtain in-situ stress information based on two methods. The first one consists in matching borehole deformations to the modelling of linear poroelasticity equations around a hole in a plate that is subjected ...
Measured radiation patterns of the scale model dipole tool
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2003)
The sound field of finite dipole acoustic transducers in a steel tool was investigated and their horizontal by measuring their vertical radiation patterns in water at two different frequencies. Measurements were also made ...
Fracture Spacing and Orientation Estimation from Spectral Analyses of Azimuth Stacks
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2005)
Discrete, vertically aligned fracture systems impart one or more notches in the spectral ratios of stacked reflected seismic traces. This apparent attenuation is due to the azimuth dependant scattering introduced by the ...
Spatial Orientation And Distribution Of Reservoir Fractures From Scattered Seismic Energy
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2005)
We present the details of a new method for determining the reflection and scattering characteristics of seismic energy from subsurface fractured formations. The method is based upon observations we have made from 3D finite ...
Elimination of LWD (Logging-While-Drilling) Tool Modes Using Seismoelectric Data
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2006)
Borehole acoustic logging-while-drilling (LWD) for formation evaluation has become an indispensable part of hydrocarbon reservoir assessment (Tang et al., 2002; Cittá et al., 2004; Esmersoy et al., 2005). However, the ...
Higher Order Modes in Acoustic Logging While Drilling
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2005)
In multipole acoustic logging while drilling (LWD), the fundamental modes dominate recorded waveforms. Higher order modes may also appear and complicate the processing of LWD data. In dipole LWD measurements, the dipole ...
Geomechanical Modeling of In-Situ Stresses Around a Borehole
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2002)
In this paper, we present a modelling of the in-situ stress state associated with the severe hole
enlargement of a wellbore.
Geomechanical information is relevant to assure wellbore stability, i.e., to prevent damages ...
Effects of source mismatch on multipole Logging
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2004)
The effects of mismatched multipole sources were investigated. Multipole sources considered here are those that they are
constructed of monopoles with appropriate sign combination. To simulate mismatched dipole and ...
Spatial Orientation and Distribution of Reservoir Fractures from Scattered Seismic Energy
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2006)
We present the details of a new method for determining the reflection and scattering characteristics of seismic
energy from subsurface fractured formations. The method is based upon observations we have made from 3D ...
Experimental Studies of Multipole Acoustic Logging with Scaled Borehole Models
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2004)
A scaled multipole acoustic tool is built for laboratory measurements at ultrasonic frequencies in borehole models. The source with four separate transducers generate monopole, dipole, and quadrupole waves by different ...