Abstract: A device for uniformly and virtually instantaneously mixing at least two fluids, comprising at least two feed channels each of which is shaped and sized so that it produces flat fluid streams, whereby a uniform mixture may be achieved virtually instantaneously in a limited area.

Abstract: A device for studying the interaction of a fluid flowing in a porous medium surrounded by a membrane and subjected to a confining pressure includes on at least part of the circumferential periphery of the membrane, a groove connected to a pressure tap for measuring or detecting the pressure prevailing at the groove.

Abstract: The invention concerns low molecular weight copolymers of acrylic acid or at least partially salified acrylic acid and acrylamide, their process of manufacture and their use. These copolymers may be used to prevent the formation of deposits on the walls of oil or geothermal equipment from aqueous systems containing dissolved salts. The copolymer is characterized in that it comprises recurrent units deriving from acrylic acid and acrylamide in a proportion by weight from 95:5 to 25:75. Furthermore, the distribution of the molecular weights of the copolymer, as determined by exclusion analytic chromatography, is such that at least 60% of the weight molecular weights are lower than 500.

Abstract: This process comprises the three successive following steps of:(a) injecting into a formation a solution of sodium or potassium hydroxide during a limited time interval to perform a chemical leaching treatment of the formation,(b) injecting a saline solution, and(c) establishing a circulation of a heat conveying fluid through the formation.