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Class Information
Number: 175/70
Name: Boring or penetrating the earth > Processes > Boring with specific fluid > Plural distinguishable liquids
Description: Processes comprising drilling with two or more liquids which remain separated in the borehole due to their mutual immiscibility, difference in specific gravities, manner of placement in the borehole, or other characteristics.










Patents under this class:

Patent Number Title Of Patent Date Issued
8534383 Viscosity reducer for water-based muds Sep. 17, 2013
8522898 Method for dispersing aqueous based drilling fluid for drilling subterranean boreholes Sep. 3, 2013
8453764 System and method for monitoring and controlling underground drilling Jun. 4, 2013
8281875 Pressure and flow control in drilling operations Oct. 9, 2012
7992655 Dual gradient drilling method and apparatus with multiple concentric drill tubes and blowout preventers Aug. 9, 2011
7660672 Method and computer program product for drilling mud design optimization to maintain time-dependent stability of argillaceous formations Feb. 9, 2010
7507692 Methods for reducing circulation loss during drilling operations Mar. 24, 2009
7278497 Method for extracting coal bed methane with source fluid injection Oct. 9, 2007
7243738 Multi seam coal bed/methane dewatering and depressurizing production system Jul. 17, 2007
7185718 Method and system for hydraulic friction controlled drilling and completing geopressured wells utilizing concentric drill strings Mar. 6, 2007
7111684 Subterranean fluids having improved environmental characteristics and methods of using these fluids in subterranean formations Sep. 26, 2006
7090036 System for drilling oil and gas wells by varying the density of drilling fluids to achieve near-balanced, underbalanced, or overbalanced drilling conditions Aug. 15, 2006
6981560 Method and apparatus for treating a productive zone while drilling Jan. 3, 2006
6966392 Method for varying the density of drilling fluids in deep water oil and gas drilling applications Nov. 22, 2005
6926101 System and method for treating drilling mud in oil and gas well drilling applications Aug. 9, 2005
6923275 Multi seam coal bed/methane dewatering and depressurizing production system Aug. 2, 2005
6877563 Methods of drilling and completing well bores Apr. 12, 2005
6843331 Method and apparatus for varying the density of drilling fluids in deep water oil drilling applications Jan. 18, 2005
6802379 Liquid lift method for drilling risers Oct. 12, 2004
6745855 Method and system for hydraulic friction controlled drilling and completing geopressured wells utilizing concentric drill strings Jun. 8, 2004
6733207 Environmental remediation system and method May. 11, 2004
6634442 Process for using biodegradable drilling muds Oct. 21, 2003
6536540 Method and apparatus for varying the density of drilling fluids in deep water oil drilling applications Mar. 25, 2003
6505691 Subsea mud pump and control system Jan. 14, 2003
6457540 Method and system for hydraulic friction controlled drilling and completing geopressured wells utilizing concentric drill strings Oct. 1, 2002
6267186 Spotting fluid and method of treating a stuck pipe Jul. 31, 2001
6105691 Modular drilling fluid system and method Aug. 22, 2000
6065550 Method and system for drilling and completing underbalanced multilateral wells utilizing a dual string technique in a live well May. 23, 2000
6039128 Method and system for obtaining core samples during the well-drilling phase by making use of a coring fluid Mar. 21, 2000
5846913 Invert biodegradable n-alkane(s) wellbore fluid containing less than 10 percent by weight of cycloparaffing isoparaffing and aromatic compounds, and method of drilling with such fluid Dec. 8, 1998
5720356 Method and system for drilling underbalanced radial wells utilizing a dual string technique in a live well Feb. 24, 1998
4718503 Method of drilling a borehole Jan. 12, 1988
4694911 Drilling assembly for percussion drilling of deep wells Sep. 22, 1987
4624327 Method for combined jet and mechanical drilling Nov. 25, 1986
4534427 Abrasive containing fluid jet drilling apparatus and process Aug. 13, 1985
4185703 Apparatus for producing deep boreholes Jan. 29, 1980
4116285 Process and apparatus for producing deep boreholes Sep. 26, 1978
4103749 Downhole cleaner assembly for petroleum wells Aug. 1, 1978











 
 
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