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Class Information
Number: 175/42
Name: Boring or penetrating the earth > With signaling, indicating, testing or measuring > Indicating agent released in drilling fluid
Description: Subject matter comprising a drilling fluid system and a step or means for releasing an identifiable substance into the drilling fluid stream which substance when carried above ground by the circulating fluid will indicate to an observer the presence of a condition.










Patents under this class:

Patent Number Title Of Patent Date Issued
8627902 Estimating drill cutting origination depth using marking agents Jan. 14, 2014
8172007 System and method of monitoring flow in a wellbore May. 8, 2012
8006781 Method of monitoring wear of rock bit cutters Aug. 30, 2011
7635033 Downhole abrading tool having taggants for indicating excessive wear Dec. 22, 2009
7565928 Downhole abrading tool having a taggant injection assembly for indicating excessive wear Jul. 28, 2009
7464771 Downhole abrading tool having taggants for indicating excessive wear Dec. 16, 2008
7410011 Method to determine the concentration of deuterium oxide in a subterranean formation Aug. 12, 2008
7178590 Well fluids and methods of use in subterranean formations Feb. 20, 2007
7026950 Motor pulse controller Apr. 11, 2006
7009198 Pattern method and system for detecting foreign object debris using a fluorescent drilling lubricant Mar. 7, 2006
6908262 Systems and methods for driving large diameter caissons Jun. 21, 2005
6725926 Method of tracking fluids produced from various zones in subterranean wells Apr. 27, 2004
6659175 Method for determining the extent of recovery of materials injected into oil wells during oil and gas exploration and production Dec. 9, 2003
6374668 Gas analyzer Apr. 23, 2002
6125786 Underground warning system for underground conduits or pipes Oct. 3, 2000
5277263 Method for measuring formation fluids in drilling fluid Jan. 11, 1994
5140527 Method for the determination of the ionic content of drilling mud Aug. 18, 1992
5027379 Method for identifying drilling mud filtrate invasion of a core sample from a subterranean formation Jun. 25, 1991
4987960 Well fluid and test method Jan. 29, 1991
4904603 Monitoring drilling mud Feb. 27, 1990
4807469 Monitoring drilling mud circulation Feb. 28, 1989
4787990 Low toxicity oil-based drilling fluid Nov. 29, 1988
4708212 Method and apparatus for optimizing determination of the originating depth of borehole cuttings Nov. 24, 1987
4635735 Method and apparatus for the continuous analysis of drilling mud Jan. 13, 1987
4630243 Apparatus and method for logging wells while drilling Dec. 16, 1986
4495803 Method of monitoring the growth of cuttings beds in angled well bores Jan. 29, 1985
4447340 Method of tracing a well drilling mud May. 8, 1984
4401169 System for lagtime measurement during drilling Aug. 30, 1983
4352674 Method of tracing a well drilling mud Oct. 5, 1982
4312414 Method and apparatus for obtaining saturation data from subterranean formations Jan. 26, 1982
4290498 Ablatible drill Sep. 22, 1981











 
 
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