Company Filing History:
Years Active: 1984-1986
Title: Innovations by John L Evans
Introduction
John L Evans is a notable inventor based in Houston, TX, who has made significant contributions to the field of borehole technology. With a total of 3 patents to his name, Evans has developed innovative solutions that enhance the efficiency and safety of drilling operations.
Latest Patents
One of Evans' latest patents is the "Magnetic Single Shot Inclinometer." This apparatus and method aim to prevent damage to the mechanical components of a borehole inclinometer. The inclinometer utilizes a freely suspended pendulum that aligns with the vertical at a selected position in the borehole. A compass connected to the pendulum rotates according to the earth's magnetic field. To protect the components that suspend the pendulum, it is clamped between a timer and a lens as the inclinometer is lowered into the borehole. At a predetermined time, the pendulum is unclamped, allowing it to reach equilibrium and measure position. After a selected interval, the timer urges the pendulum against the lens to clamp it again. The inclinometer is then raised from the wellbore, and the orientation of the pendulum relative to the lens is observed to determine the azimuth and inclination of the borehole.
Another significant patent is the "Method and Apparatus for Monitoring Fluid Flow Between a Borehole and Surrounding Formations." This invention establishes the rate at which fluid is transferred between a borehole and the surrounding formations during the movement of the drill string. A bell nipple is situated at the upper portion of the borehole, and while tripping, drilling fluid is circulated into the borehole and exits through an outflow port in the bell nipple. The level of drilling fluid is maintained constant at the outflow port. Meters are provided to measure inflow and outflow rates, and circuitry is used to establish the volume rate at which the drill string changes within the borehole. The outputs of the meters and rate establishing means are summed to determine the compensated rate of fluid transfer, which is compared to an alarm limit. An alarm is activated if the compensated rate exceeds this limit.
Career Highlights
John L Evans is currently employed at Exxon Production Research Company, where he continues to innovate and contribute to advancements in drilling technology. His work has been instrumental in improving the safety and efficiency of drilling operations.
Collaborations
Evans has collaborated