Patent ID: 7871962
Filing Date: 2011-01-18
Classification: C09K

Abstract:
1. A drilling fluid comprising: an oleaginous fluid, wherein the oleaginous fluid is the continuous phase of the drilling fluid and wherein the oleaginous fluid occupies from about 30% to about 95% by volume of the drilling fluid and the oleaginous fluid is selected from the group consisting of diesel oil, mineral oil, synthetic oil, esters, ethers, acetals, di-alkylcarbonates, olefins, and combinations thereof; a non-oleaginous fluid, wherein the non-oleaginous fluid is the discontinuous phase of the drilling fluid, wherein the non-oleaginous fluid occupies from about 5% to about 70% by volume of the drilling fluid and the non-oleaginous fluid is selected from the group consisting of fresh water, sea water, a brine containing organic or inorganic dissolved salts, a liquid containing water-miscible organic compounds, and combinations thereof; an organophillic clay, wherein the organophillic clay is present in a concentration of about 0.1% to about 6% by weight; a primary emulsifier, wherein the primary emulsifier is an amidoamine and is present in a concentration of 7 to 8 pounds per barrel; a secondary emulsifier, wherein the secondary emulsifier is an oleic acid based wetting agent and is present in a concentration of 1 to 2 pounds per barrel; a weighting or bridging agent, wherein the weighting or bridging agent is selected from the group consisting of galena, hematite, magnetite, iron oxides, illmenite, barite, siderite, celestite, dolomite, calcite and combinations thereof; and a rheology modifier, wherein the rheology modifier is a mixture of C