William B Nelligan

Title: **William B. Nelligan: Innovator in Neutron Logging Technologies**

Introduction

William B. Nelligan, an accomplished inventor based in Danbury, Connecticut, has made significant contributions to the field of neutron logging with a total of seven patents to his name. His innovative methods and apparatuses have transformed the way we understand the properties of earth formations surrounding well bores.

Latest Patents

Two of Nelligan's most notable patents focus on methods and apparatuses for epithermal neutron decay logging. The first patent details a technique to determine the nature of hydrogenous fluids in geological formations. By employing bursts of high-energy neutrons, this method uses the ratio of time-dependent parameters related to the decay of epithermal neutron populations at different energy levels. This enables the identification of the types of fluids present, independent of porosity. Specifically, measurements taken above 0.4 eV indicate the existence of fluids such as water and hydrocarbons, while readings above 0.15 eV provide insights into the molecular structure of the hydrogen present.

The second patent also pertains to epithermal neutron logging and focuses on deriving formation porosity. This is accomplished through the use of a directionalized and borehole-shielded epithermal neutron detector array. The process involves analyzing the count rate measurements of epithermal neutrons and employing multi-parameter fitting techniques to separate environmental effects from formation characteristics. These innovations enhance the accuracy of porosity measurements and contribute to more effective resource exploration.

Career Highlights

Nelligan's career is closely intertwined with Schlumberger Technology Corporation, a leader in oilfield services and technology. Through his work at Schlumberger, Nelligan has developed technologies that significantly improve the assessment of earth formation properties. His extensive experience and dedication to innovation in neutron logging have positioned him as a respected figure in the industry.

Collaborations

Throughout his career, Nelligan has collaborated with esteemed colleagues such as Russel C. Hertzog and William A. Loomis. Their collective efforts have led to advancements in neutron logging technologies and have furthered the understanding of subsurface geological formations.

Conclusion

William B. Nelligan's work in neutron logging technology represents a remarkable fusion of scientific research and practical application. With his seven patents, he has not only contributed to the field but has paved the way for future innovations in fluid detection and porosity measurement within earth formations. His legacy at Schlumberger Technology Corporation and his collaborations with fellow innovators demonstrate a commitment to advancing the field of geophysical exploration.