Paul A Johnson

Title: Paul A Johnson: Innovator in Downhole Acoustic Measurements

Introduction

Paul A Johnson is a notable inventor based in the United States, recognized for his contributions to the field of acoustic measurements in rock formations. With a focus on innovative methods for measuring pore pressure and creating three-dimensional images of non-linear acoustic properties, Johnson has made significant strides in geophysical research.

Latest Patents

Johnson's latest patents include "Downhole Nonlinear Acoustics Measurements In Rock Formations Using Dynamic Acoustic Elasticity And Time Reversal." This patent describes apparatus and methods for measuring pore pressure in rock formations through an open or cemented and/or cased borehole. The Dynamic Acoustic Elasticity (DAE) method is employed to characterize nonlinear parameters by perturbing a selected rock formation volume with a High Amplitude, Low Frequency (HALF) acoustic strain wave, while probing this volume using a Low Amplitude, High Frequency (LAHF) acoustic wave. Additionally, time reversal techniques are utilized for focusing acoustic energy into the formation near the pipe or open hole.

Another significant patent is "System And Method To Create Three-Dimensional Images Of Non-Linear Acoustic Properties In A Region Remote From A Borehole." This method involves creating three-dimensional images of non-linear properties and the compressional to shear velocity ratio in a region remote from a borehole using a conveyed logging tool. The process includes arranging a first source in the borehole to generate a steered beam of elastic energy at a first frequency and a second source to generate a steerable beam at a second frequency. The beams intercept at a location away from the borehole, and a sensor receives a third elastic wave created by a three-wave mixing process.

Career Highlights

Throughout his career, Johnson has focused on advancing the understanding of acoustic properties in geological formations. His innovative approaches have contributed to improved methods for subsurface exploration and resource management.

Collaborations

Johnson has collaborated with Robert Guyer, a fellow researcher in the field, to further enhance the development of acoustic measurement techniques.

Conclusion

Paul A Johnson's work in downhole acoustic measurements showcases his commitment to innovation in geophysical research. His patents reflect a deep understanding of acoustic properties and their applications in rock formations.