Dresser Industries, Inc.

Hoechst Celanese Corporation

Richard Eugene Irby

Lorenzo P DiSano

Marion Barney Jett

Eduardo Alvarez

G Stephen Kyker

Jay Warner Jackson

A seal comprises a sandwich of a soft, low modulus resinous layer between two outer layers of harder, high modulus resinous material to provide an effectve high pressure seal at both low and high temperatures. The seal can be used in well head service, e.g., in a blowout preventer or stuffing box seal, in oil wells, geothermal wells of hydraulic mining pipes. The high modulus material is preferably a polybenzimidazole containing 5 to 50 wt. % short fibers. The low modulus material is preferably a thermoplastic fluorinated hydrocarbon polymer or a fluorinated synthetic elastomer containing polybenzimidazole in powder and/or short fiber form and short fibers of glass and/or carbon. For blowout preventer service, the seal can take the form of a T to be fitted with complementary metal retainers to form a cylindrical seal unit having a semicylindrical groove in the seal face to mate with the polish rod or tubing.

Seal structure for elevated temperature service

Apparatus for sensing the flow from a pumped well and for generating signals indicative of that flow includes an orifice flow sensing system adapted to be placed into the flowline of a pumped well and being operably connected to an electro-mechanical signal switch.

Well flow sensing apparatus

A system for maintaining a constant biasing pressure upon the sealing members of a rod pump stuffing box utilizes a hydraulic system under a constant preset pressure to bias the seal member into sealing engagement against the pump polished rod. Means are also disclosed for continuously monitoring the amount of wear undergone by the seal means and for actuating a warning light or shutting down the pumping unit when the seal means has undergone extensive wear or when leakage from the stuffing box has reached a predetermined level.

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Irving, TX, United States of America

Richard Eugene Irby