Company Filing History:
Years Active: 1986-1989
Title: The Innovative Contributions of Ernest H. Purfurst
Introduction
Ernest H. Purfurst is a notable inventor based in Houston, TX, recognized for his significant contributions to the field of formation testing tools. With a total of 4 patents, his work has advanced the methods used in evaluating the permeability of geological formations.
Latest Patents
Among his latest patents, Purfurst developed a method and apparatus for instantaneously indicating permeability. This invention is designed for use in a formation testing tool that can be lowered into a borehole on a logging cable. The apparatus conducts formation measurements by extending a snorkel into the formation of interest. It initiates a drawdown that begins at a first time and terminates at a second time, measuring the flow rate during this process. The method further determines a Horner Plot for the formation, measuring the slope of the plot and extending it to obtain the intercept that represents the final formation pressure after build-up. The computer circuitry involved evaluates a relationship that responds to the slope of the Horner Plot, formation fluid viscosity, pretest flow rate, and formation thickness to yield permeability.
Another significant patent by Purfurst is a formation tester that utilizes a snorkel to obtain pressure tests and collect samples from a formation of interest. This device includes multiple sample storage containers and connects the sample line to storage containers, as well as to pretest and post-test drawdown elements. These elements alter the sample line back pressure, working in conjunction with an equalizing valve to selectively isolate the snorkel from fluid and fluid pressures in the well.
Career Highlights
Throughout his career, Purfurst has worked with prominent companies such as Halliburton Company and Halliburton Logging Services, Inc. His experience in these organizations has contributed to his expertise in the field of formation testing and permeability evaluation.
Collaborations
One of his notable coworkers is Gary K. Baird, with whom he has collaborated on various projects related to formation testing technologies.
Conclusion
Ernest H. Purfurst's innovative patents and career achievements have made a significant impact on the field of formation testing. His work continues to influence the methods used in evaluating geological formations, showcasing the importance of innovation in this sector.