Douglas J. Patterson

Detection of high incident reflective boundaries using near-field shear waves

Acoustic wave imaging of formations

Fracture evaluation through cased boreholes

Televiewer image wood-grain reduction techniques

Methodologies to Improve Reliability of Transducer Electrical Interconnections

Radon migration of acoustic data

Low frequency formation shear slowness from drilling noise derived quadrupole array data

Integrating Multiple Data Sources for Drilling Applications

Method and apparatus for determining radial shear velocity variation from dipole acoustic logging

Televiewer image wood-grain reduction techniques

Casing thickness evaluation method

Method and apparatus for acoustic impedance and P-wave anisotropy measurements

Electromagnetic linear drive source for logging-while-drilling/wireline acoustic applications

Active noise cancellation through the use of magnetic coupling

Curve-fitting technique for determining dispersion characteristics of guided elastic waves

Method and system for delineating a second wellbore from a first wellbore

Micro-Annulus Detection Using Lamb Waves

Composite transducer for downhole ultrasonic imaging and caliper measurement

Acoustic Imaging Away From the Borehole Using a Low-Frequency Quadrupole Excitation

METHODS AND APPARATUS FOR HIGH-SPEED TELEMETRY WHILE DRILLING

Identification of stress in formations using angles of fast and slow dipole waves in borehole acoustic logging

Early kick detection in an oil and gas well

Sensors For Estimating Properties Of A Core

VSP pattern recognition in absolute time

Method and apparatus for characterizing and estimating permeability using LWD Stoneley-wave data

Imaging Near-Borehole Reflectors Using Shear Wave Reflections From a Multi-Component Acoustic Tool

Wave analysis using phase velocity processing

Using statistics of a fitting function for data-driven dispersion slowness processing

Active noise cancellation through the use of magnetic coupling

P-wave anisotropy determination using borehole measurements

Method and apparatus for cement evaluation using multiple acoustic wave types

Casing resonant radial flexural modes in cement bond evaluation

Method for processing acoustic reflections in array data to image near-borehole geological structure

Dynamic acoustic logging using a feedback loop

Method and apparatus for generation of acoustic shear waves through casing using physical coupling of vibrating magnets

Method and apparatus for generating acoustic signals for LWD shear velocity measurement