Company Filing History:
Years Active: 1977-1987
Title: David R Parrish: Innovator in Underground Gasification
Introduction
David R Parrish is a notable inventor based in Tulsa, OK (US), recognized for his contributions to the field of underground gasification. With a total of 4 patents, Parrish has made significant advancements in methods for producing synthesis gas from coal.
Latest Patents
One of his latest patents is a method of producing synthesis gas by underground gasification of coal. This innovative process includes a novel system of injection and production wells. The injection well is strategically positioned at an angle with respect to horizontal that is less than the angle of repose of loose coal and char for the specific coal seam. Meanwhile, the production well is positioned at an angle greater than the angle of repose but less than 90 degrees. This design protects the injection well during the gasification process and optimizes the production well's position for maximum output while alleviating certain tensile and shear stresses.
Another significant patent by Parrish is the method for selective plugging of depleted channels or zones in situ. This technique allows for the selective plugging of depleted zones or channels in in situ retorts that bypass unretorted zones. By contacting these depleted zones in the in situ oil shale retort with an aqueous liquid, which is substantially free of a formation plugging amount of a solute, the resistance of the depleted zone or channel to the passage of retorting gases is increased.
Career Highlights
Throughout his career, David R Parrish has worked with prominent companies such as Standard Oil Company (Indiana) and Amoco Corporation. His experience in these organizations has contributed to his expertise in the field of gasification and energy production.
Collaborations
Parrish has collaborated with notable individuals in his field, including Bruce W Gash and Luis E Arri. These partnerships have likely enhanced his innovative capabilities and contributed to the development of his patents.
Conclusion
David R Parrish stands out as an influential inventor in the realm of underground gasification, with a focus on improving methods for synthesis gas production. His patents reflect a commitment to innovation and efficiency in energy production.