Lamberti Spa

Massimo Cecchetto

Giuseppe Li Bassi

Giovanni Floridi

Luigi Merli

Pierangelo Pirovano

Erik Gallo

Cristina Picco

Letizia Privitera

Lorena Bottarello

Laura Vigano′

Laura Vigano'

Cristina Maria Picco

A method of minimizing the weight loss of mass of the drilling pipe and wellbore casing while drilling a subterranean well with an oil-based drilling fluid comprising adding to the oil-based drilling fluid an anti-wear additive based on sulfated, sulfonated or sulfited natural oils or fats of vegetable or animal origin.

Method of drilling a wellbore

Method for increasing lubricity of a wellbore fluid comprising the following steps: i) preparing a water in oil microemulsion that contains insoluble particles of metal hydroxides and/or metal oxides in the inner aqueous phase, the insoluble particles being synthesized from their salt precursors in the water droplets of the microemulsion; ii) adding to the wellbore fluid the water in oil microemulsion; iii) injecting the wellbore fluid into a subterranean formation and iv) performing the drilling, completion or coiled tubing operations in the subterranean formation.

Method of increasing lubricity of wellbore fluids

Water in oil emulsion drilling and well treatment fluids comprising an ester of trimer fatty acids and polyoxyethyiene glycol, the polyoxyethyiene glycol having average molecular weight from about (150) to about (600) and the trimer acids having at least about 20% of carboxyl acid groups esterified, as rheology modifier.

Rheology modifier for drilling and well treatment fluids

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Massimo Cecchetto