http://www.freshpatents.com/Earth-boring-well-treating-and-oil-field-chemistry-dtnewntc507.php USPTO Class 507 - Earth boring, well treating, and oil field chemistry en-us Mon, 6 Feb 2012 13:33:43 -0800 1000 Wednesday Thursday Friday Saturday Sunday 141 31 http://www.freshpatents.com/index.php?rss=true http://www.freshpatents.com/images/freshpatentsnav_rss.gif http://www.freshpatents.com/-dt20120202ptan20120028853.php Mon, 6 Feb 2012 13:33:43 -0800 Well fluids and well fluid additives comprising a blend of guar gums of various viscosities, methods of making and using such fluids and additives, and methods of operating a well using such fluids and/or additives.... http://www.freshpatents.com/-dt20120202ptan20120028854.php Mon, 6 Feb 2012 13:33:43 -0800 The disclosure relates to a drilling fluid having a viscosity at 40° C. less than or equal to 2.5 mm2/s and having a vapor pressure at 100° C. less than or equal to 10 mBars (1 KPa) obtained from a hydrocarbon fraction having a distillation temperature of 200 to 280°... http://www.freshpatents.com/-dt20120202ptan20120028855.php Mon, 6 Feb 2012 13:33:43 -0800 A method of using water-based drilling fluid in a subterranean formation containing shale which swells in the presence of water by circulating a water-based drilling fluid into the formation. The drilling fluid is made of an aqueous based continuous phase, a weighting material, and a shale hydration inhibition agent (SHIA)... http://www.freshpatents.com/-dt20120202ptan20120028856.php Mon, 6 Feb 2012 13:33:43 -0800 The invention also relates to a method for preparing such a copolymer, an inhibitor composition including such a copolymer, and a method for inhibiting inorganic deposits in a petroleum reservoir by means of said inhibitor composition. C) at least one monomer unit (c)...