04272258 is referenced by 39 patents and cites 9 patents.

Method and apparatus for degassing mud. The mud, which has been returned from a borehole, is forced to flow upwardly through a main cylindrical housing by the action of an auger device. The auger flight is spaced from the auger shaft, so that a longitudinally extending, axial passageway is formed within the housing for removal of gases from the mud. The auger flight is comprised of a plurality of sections, each axially spaced from one another, with a perforated member being interposed therebetween. The combined action of the flight and the perforated member causes the mud to assume a flow path which releases an unexpected amount of gas therefrom. An annular trough at the top of the housing collects the degasified mud. A closure member at the upper end of the housing enables the axial passageway to be evacuated which enhances the removal of gases from the mud.

Title
Mud degasser method and apparatus
Application Number
6/97407
Publication Number
4272258
Application Date
November 26, 1979
Publication Date
June 9, 1981
Inventor
Wiley M Shifflett
P.O. Box 133, Mentone, 79754
TX, US
Agent
Marcus L Bates
IPC
B01D 19/00
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