Eniricerche S.p.a.

Agip S.p.a.

Fausto Miano

Enrico Borgarello

Thomas Paul Lockhart

Armando Marcotullio

Giovanni Burrafato

Roberto Menicagli

Stefano Carminati

Nevio Moroni

Giuseppe Calloni

Antonello Pittalis

A cementitious composition for oil well cementation able to prevent fluid migration comprises water, hydraulic cement, surfactant or organic dispersant, and carbon black.

Cementitious composition for the cementation of oil wells

Aqueous drilling muds effective at high temperature containing complexes, preformed or formed in situ, of tetravalent zirconium with one or more organic acids, or relative salts, of general formula (I) ##STR1## where R.sub.1 and R.sub.2, which can be the same or different, represent --H, --COOH, --CH.sub.3, --CH.sub.2 COOH or --CH(OH)COOH, or R.sub.1 and R.sub.2 jointly represent an oxo group (.dbd.O).

Drilling muds effective at high temperature

The object of the present invention is a method for the photocatalytic treatment of aqueous mixtures of polluting substances. Such a method consists in submitting such mixtures to irradiation in the presence of titanium dioxide while they are circulating inside a reactor formed by a hollow space of not more than 5 cm of thickness, whose inner wall is the wall of a lamp emitting at least a fraction of its radiations with a wavelength shorter than 400 nm. In this reactor a cooling sheath is not provided between the lamp and the reaction mixture and temperature control is accomplished by means of the circulation of the same reaction mixture inside the reactor.

Reactor for photooxidations in an aqueous environment

The regeneration of active carbon onto which one or more organic substances may be adsorbed is achieved by means of a photodegrading process catalyzed by a semiconductor.

Process for the regeneration of active carbon

A method for purifying water containing pollutant mixtures is described, which uses a reactor containing a semiconductor as reaction catalyst and a lamp which emits radiation having a wavelength of less than 400 nm. The reactor, characterized in that its walls allow water and the pollutant substances to pass through, is immersed in the water to be purified so that the pollutants contained in it reach the reactor interior where they are adsorbed on the semiconductor activated by light radiation, and are then degraded.

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Enna, Italy

Fausto Miano