Abstract:
The basic fluid is water, oil or an oil-water mixture. The primary weighting materials are dissolved salts, e.g., sodium chloride, calcium chloride or mixed brines, and in these the calcium or sodium ions inhibit hydration and swelling of drilled solids. When non-cationic fluids are used, an inhibitor is added to prevent such hydration and disintegration - an electrolyte or a cationic surfactant. Any viscosifier added is one having neither a structured viscosity nor gel strength, hydroxyethyl cellulose, for example. When the drilling fluid is pumped to the surface, most of the drilled solids are in their original condition and size and are readily removed and discarded by screening and other available physical means. There is none of the build-up of solids associated with older systems and, hence, no need for discarding, thinning, and make-up.
Abstract:
The basic fluid is water or an oil-water mixture. The primary weighting materials are dissolved salts, e.g., sodium chloride, calcium chloride or mixed brines, and in these the calcium or sodium ions inhibit hydration and swelling of drilled solids. When non-cationic fluids are used, an inhibitor is added to prevent such hydration and disintegration - an electrolyte or a cationic surfactant. Any viscosifier added is one having neither a structured viscosity nor gel strength, hydroxyethyl cellulose for example. When the drilling fluid is pumped to the surface, most of the drilled solids are in their original condition and size, and are readily removed and discarded by screening and other available physical means. There is none of the build-up of solids associated with older systems, and hence no need for discarding, thinning, and make-up.
Abstract:
This invention is directed to a variable lateral-attitude propulsion system principally for heavier-than-air craft such as powered autogyro vehicles, and for lighter-than-air craft as well as for ground effects lifting means. This propulsion system provides horizontal movement to the vehicle as well as azimuthal control and directional movement along the horizontal, all without the use of a conventional rudder.
Abstract:
An illuminated base comprising an enclosing cabinet which contains an electrical circuit, a lamp and a push type switch to control the lamp. A reflecting cover upwardly closes the cabinet and is provided with an opening therein to permit light rays to shine upwardly therethrough. The switch is operable through a foam rubber base pad which can be readily compressed against a stationary surface when it is desired to activate the lamp.