Other

Baker Hughes Corporation

Fred A Brooks

Thomas W Daves

William Lang

The invention provides for metering the pumping rate of BFS/mud mixtures pumped to the cementing head on a rig for sealing off the formation from the casing. Since BFS/mud mixtures require an activation agent, preferably sodium hydroxide is pumped into the flowline to the cementing head. Feedback from the BFS/mud slurry flowrate is fed to the activator injector pump drive system to regulate the addition rate of the activating agent in response to varying conditions, such as mud flowrate. The injection rate target can also be adjusted to compensate for any changes in downhole temperature. The risk of fouling surface equipment and the casing internal diameter is minimized because the activation agent is added very close in time to when the BFS/mud mixture enters the cementing head. Even in situations where the anticipated downhole temperature is significantly lower than the surface temperature, a sufficient amount of activating agent is added for the downhole conditions without fear of fouling the casing internal or the surface pumping equipment.

Method and apparatus for activation of furnace slag base cement

A self regulating telephone apparatus wherein an individual's speech is converted to a representative electrical signal. This signal is represented by a product wave or waves of the form f(A)t x f(B)t where f(A)t represents the amplitude of the informational signal f(B)t. The signal is separated by demodulation of the cross product into its components. The relative amplitudes of the terms are changed as desired and the cross product re-established by remodulation. Since the term f(A)t represents the amplitude and its frequency range is removed from f(B)t, amplification can be provided at frequencies exhibiting low coupling between the receiver and transmitter transducer in a hand telephone set to permit increasing the signal volume output as required.

Self regulating telephone sets

A four-wire interface regulator for long distance trunk circuits is provided in which the interface regulator separates the components of a conventional local plant output signal to change the relative magnitude of the components to deliver any desired output with a minimum variability to drive long distance trunk circuits.

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Maplewood, NJ, United States of America

Fred A Brooks