Abstract: Drilling fluid properties are enhanced by incorporation thereinto of a cyclicetherpolyol such as a cyclic dimer of glycerol and, optionally, a polyol such as glycerol or a monoalicyclicpolyol, and/or salt.

Abstract: An invert oil emulsion drilling fluid containing oil, an emulsifier such as a fatty acid soap, clay or polymer, and an alcohol such as glycerol or cyclicetherpolyol as the internal phase of the emulsion. A method using substantially water-free drilling fluid and monitoring the influx of formation water into the drilling fluid.

Abstract: Oil in water emulsion drilling fluid properties are enhanced by incorporation thereinto of an alcohol such as glycerol or polycyclicpolyetherpolyol and salt.

Abstract: Drilling fluid properties are enhanced by incorporation thereinto of a cyclicetherpolyol such as a cyclic dimer of glycerol and, optionally, a polyol such as glycerol or a monoalicyclicpolyol, and/or salt.

Abstract: Drilling fluid properties are enhanced by incorporation thereinto of an alcohol such as glycerol, partially hydrolyzed polyacrylamide and, optionally, salt.

Abstract: Gas hydrate formation in a gas well is prevented by injecting a carrier and an alcohol (e.g., glycerol or a glycerol derivative) into the well and connected facilities/pipelines.

Abstract: An invert oil emulsion drilling fluid containing oil, an emulsifier such as a fatty acid soap, clay or polymer, and an alcohol such as glycerol or cyclicetherpolyol as the internal phase of the emulsion. A method using substantially water-free drilling fluid and monitoring the influx of formation water into the drilling fluid.

Abstract: A drilling mud is converted in-situ to a cement by addition of blast furnace slag.

Abstract: Cement-to-casing sealing in a wellbore is improved through addition of a polyalcohol to the cement.

Abstract: The rheological characteristics of aqueous well drilling fluids are improved by incorporating into the fluids small amounts of sulfonated styrene-maleimide copolymers and at least one water-soluble polymer prepared from acrylic acid or acrylate or their derivatives.

Abstract: The rheological characteristics of aqueous well drilling fluids are improved by incorporating into the fluids small amounts of sulfonated styrene-maleic anhydride copolymers and at least one water-soluble polymer prepared from acrylic acid or acrylamide or their derivatives.

Abstract: The rheological characteristics of aqueous well drilling fluids are improved by incorporating into the fluids small amount of sulfonated styrene-itaconic acid copolymers and at least one water-soluble polymer prepared from acrylic acid or acrylamide or their derivatives.

Abstract: The rheological characteristics of aqueous well drilling fluids are improved by incorporating into the fluids a small amount of a sulfonated styrene-itaconic acid copolymer.

Abstract: A binocular reflecting telescope for astronomical or terrestrial use having two telescope tubes disposed side by side. Each tube has primary concave mirrors operating as Herschelian Newtonian to direct incident light as a reflected first pencil of light rays towards a plane secondary mirror disposed adjacent a portion of the side wall of the respective tube which is also adjacent the remaining tube. Each secondary reflector reflects rays as a respective second pencil outwardly of the tube into respective eye piece. The second pencils of light rays are reflected generally in the same direction and the eye pieces are generally parallel and spaced apart at an appropriate interocular spacing to provide binocular viewing. Interocular axis extending between optical axes of eye pieces is disposed obliquely to parallel longitudinal axes of tubes to provide comfortable viewing. One tube is movable axially relative to the remaining tube to swing interocular axis to vary interocular spacing.