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Eni S.p.a.

Enichem Synthesis S.p.a

Agip Petroli S.p.a.

Polimeri Europa S.p.a.

Sandra Cobianco

Alessandro Lezzi

Thomas Paul Lockhart

Alberto Guarneri

Arnaldo Roggero

Alberto Renato De Angelis

Rino D'Aloisio

Paolo Pollesel

Marco Ricci

Rossella Bortolo

Lucilla Del Gaudio

Paola Albonico

Roberto Tassinari

Emilio Gatti

Martin Bartosek

Mauro Palazzina

Giuseppe Ripa

Alberto Forlini

Chiara Neva Emiliani

Cristina Tonini

A water-based fluid, containing: a non-ionic surfactant, which is stable in a temperature range from 10 to 90&#xb0; C. and soluble in water; and a salt, wherein the non-ionic surfactant contains an alkyl polyglucoside selected from the group consisting of a Calkyl polyglucoside, a Calkyl polyglucoside, and mixtures thereof, and the salt is present, and is present in an amount up to 60%. In addition, a process for preventing the formation of a W/O inverse emulsion or resolving a W/O inverse emulsion that has already formed in an oil well in which an oil-based mud has been employed by injecting the water-based fluid into the oil well.

Water-based fluid for preventing the formation of W/O emulsions or for resolving W/O emulsions already formed in porous matrices

Process for the production of sulfur, obtained in pure form, and possibly easily disposable even at ambient temperature, starting from hydrogen sulphide contained in natural gas, which includes: a) oxidizing a portion of hydrogen sulphide to sulfur dioxide; b) dissolving in water the sulfur dioxide obtained in step (a); c) carrying out the reaction (I): 2HS+SO&#x2192;3S+2HO (I) making the remaining hydrogen sulphide to react with the solution prepared in step (b); and d) using the thus obtained sulfur suspension for the production sulfur or, alternatively, to use it for the disposal of the sulfur itself in a site reserved for such purpose.

Process for the production of sulfur, starting from the hydrogen sulphide contained in the natural gas, or in the associated gas and possible disposal of the thus obtained sulfur

Process for reducing the adsorption of hydrosoluble polymers onto rock matrix, which comprises putting the rock matrix in contact with an aqueous solution of polymers containing sacrificial agents, preferably selected from ionic and non-ionic oligomeric surface-active agents. In the preferred embodiment the surface-active agents are non-ionic.

Process for reducing the adsorption of polymers onto rock matrix

Non-damaging drilling fluids

Block copolyethers having general formula (I):

Block copolymers, their preparation and their use as lubricants

Water insoluble polymers containing hydrophilic pendant moieties ending with a chelating group are disclosed. The polymers are useful in the purification of water polluted by heavy metals such as mercury and lead. The polymers have the general formula P--(--(--O--R).sub.n --(NH--Q).sub.p --F).sub.m where P is a polymeric matrix capable of reacting with a polyalkylene glycol or an alkylene oxide having such a structure and molecular weight as to be insoluble in water; R is either --CH.sub.2 CH.sub.2 -- or mixtures of --CH.sub.2 CH.sub.2 -- and --CH.sub.2 CH(CH.sub.3)--, with the molar ratio of both units in the mixture being at least 3:1; n is 3 to 50; m is a numeral such that the % by weight of all of the --(--(--O--R--).sub.n (NH--Q).sub.p --F hydrophilic chains is higher than 1% by weight of the total weight of (I); Q is a C.sub.2 -C.sub.6 difunctional aliphatic or aromatic hydrocarbon radical; p is 0 or 1; F is a chelating group selected from dithiocarbamate and methyl-thiourea when p is 1, or from thiol and isothiouronium when p is 0.

Polymer containing chelating groups, process for preparing it and its

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Fara Gera d'Adda, Italy

Sandra Cobianco