Conoco Inc.

Continental Oil Company

Hilbert D Dahl

Richard E Doerr

David L McCain

Ronald W Umphrey

Nathandale Farris

A slurry recovery sump apparatus is formed from a substantially vertical sidewall and a substantially circular horizontal cross-section and includes a bottom. A support extends diametrically across the sump and above the sump, a material input is mounted between the sidewall and the vertical axis of the sump and is attached to the support, a slurry removal apparatus is mounted to the support between the sidewall and the sump vertical axis on the opposite side from the material input. Apparatus is provided for rotating the sump support around the vertical axis and additional apparatus is provided for moving the sump removal apparatus in a prescribed manner to empty the material being deposited into the sump by the material input.

Slurry recovery from a circular sump

A device for providing directional control to a borehole being drilled. The device is used with a drilling system including a drill string, a downhole motor and a bit rotated by the downhole motor. The device exerts a deflecting force perpendicular to the axis of the drill string when a lower than normal thrust is imposed on the drill string, and exerts an opposite perpendicular force when a higher than normal thrust is imposed on the drill string. When normal thrust is being used, the device does not cause deflection in either direction.

Thrust actuated drill guidance device

In order to concentrate coal slurry from a plurality of mine faces being pumped through a plurality of individual pipes, a shallow sump is formed by digging a trench along a mine tunnel and the individual pipes empty into the sump. The product, such as coal, is allowed to settle to the bottom where it is picked up and pumped out of the mine at a controlled concentration, thereby improving the pumping efficiency of the pipeline system.

Shallow underground coal slurry concentration sump

An underground, improved slurry transportation system consists of a first and second vertical cavity. Both cavities have a vent means to the surface of the earth. Slurry input means from a plurality of mine faces communicates with the upper portion of the first vertical cavity and slurry output means communicates with the lower portion of the first vertical cavity. A pump connected to the slurry outlet forces the slurry from underground through a slurry handling pipe system to a preparation plant located on the surface of the earth. Water is added to the second vertical cavity by an inlet communicating with the upper portion of the cavity. Water is also provided to the first cavity, and valves are provided to add water to either the first or second cavity upon demand. A decant system is also provided between the first and second cavities to remove any excess water that may accumulate in the first cavity. A slurry level indicator is mounted vertically in the first cavity to measure the levels of slurry concentration in the cavity. A water level indicator is mounted vertically in the second cavity to measure the level of the water. An electronic apparatus from the surface of the earth determines the slurry concentration in the first cavity and the water level in the second cavity and provides apparatus for controlling these levels to a predetermined amount.

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Ponca City, OK, United States of America

Hilbert D Dahl