Elf Atochem S.a.

Arkema Inc.

Total Sa

Elf Aquitaine Production

Elf Aquitaine Exploration

Arkema France

Atofina

Annie Commarieu

Francis Humblot

Fabrice Aubertin

Jean Ollivier

Olivier Tillement

Emmanuel F Arretz

Thierry Aubert

Didier Anglerot

Pascal Perriat

Matteo Martini

Coralie Serres Piole

Cédric Louis

Nicolas Crowther

Hugues Preudhomme

Emmanuel Cadot

Michel Lacroix

Isabelle Bazin

The present invention relates to the development of tracer fluids, more generally, that of aqueous liquids, intended to be injected under pressure in an oil reservoir, for example from an injection well up to a production well. The object of the invention is to propose a new method of study of a solid medium, i.e. an oil reservoir, by diffusion of a liquid (i.e. injection waters) containing tracers, through said solid medium, which is simple to implement and economical and which remedies the drawbacks of the known tracers for injection waters of oil reservoirs. This method essentially consisting of injecting, in this solid medium, an injection liquid comprising a nanoparticle-based tracer having average dimensions comprised between 20 and 200 nm, detectable by means of one or several S signals at dilutions of less than or equal to 10, adapted to form a stable colloidal suspension in a saline medium, at least a portion of which is constituted of a core and a coating provided with an adjustable hydrophilic-lipophilic balance (HLB) and comprising at least one organic and/or organosilicon component; recovering the liquid having diffused; and analyzing this liquid having diffused to measure the quantity of tracer by detection of the signal or signals S.

Use of nanoparticles for labelling oil field injection waters

The invention concerns a method for surveying a subsurface formation containing hydrocarbons, comprising:

Method for detecting tracer compounds for hydrocarbon production

The continuous process for manufacturing bisphenol A according to the invention, by reacting phenol and acetone in the presence of a strong acid catalyst and a co-catalyst, is carried out using as co-catalyst a dithio ether of general formula: in which the symbols R and R' each represent a hydrogen atom, an alkyl radical or a phenyl radical, and the symbol R&#x2033; represents an optionally substituted alkyl radical.

Method for making bisphenol A

Composition intended for the flotation of ores, comprising: Process for the recovery by flotation of metal compounds of value present in ores employing it.

Composition formed of mercaptans which can be used in a process for the flotation of ores

To purify a dimethyl sulphoxide (DMSO), it is placed in contact with a plurality of cation exchange resins at least one of which is a resin of sulphonic type in &mdash;SO,H or &mdash;SO,NH,form, it being possible for the other or others to be of chelating type. The DMSO thus obtained has an iron cation content lower than 1 ppb and a sodium cation content lower than 2 ppb.

Process for purification of dimethyl sulphoxide (DMSO)

The subject matter of the present invention is a process for the purification of a virtually anhydrous organic liquid other than DMSO alone, in order to decrease its content of alkali and alkaline-earth metal and metal cations, characterized in that it consists essentially in placing this organic liquid in contact with one or more cation exchange resins and in then separating from the resin(s) the purified organic liquid, said resin or at least one of said resins being a sulphonic resin in --SO.sub.3 H or --SO.sub.3 NH.sub.4 form based on a polystyrene-divinylbenzene copolymer having a divinylbenzene content of from 50 to 60% by weight, without taking the sulphonic groups into account.

Process for the purification of virtually anhydrous organic liquids

To purify a dimethyl sulfoxide (DMSO), this DMSO is placed in contact with an ion exchange resin of sulfonic type in --SO.sub.3 NH.sub.4 form, and the DMSO is then separated from the resin. The DMSO thus obtained has an iron cation content lower than 1 ppb and a sodium cation content lower than 2 ppb.

Method for purifying dimethyl sulphoxide (DMSO)

The process for the purification of an alkanesulphonyl chloride (ASC) in order to reduce the sulphate content thereof consists in washing the alkanesulphonyl chloride with water or with an aqueous solution of an acid having a pH of between -0.57 and 7 and then in separating the alkanesulphonyl chloride thus purified from the aqueous phase. This purified ASC leads, by total hydrolysis, to alkanesulphonic acid with a low content of sulphuric acid.

Process for the purification of an alkanesulphonyl chloride and of the

The invention relates to the manufacture of methyl mercaptan by catalytic hydrogenation of dimethyl disulphide on a catalyst based on sulphide(s) of at least one transition metal. The selectivity with respect to methyl mercaptan is considerably improved by working in the presence of water and/or hydrogen sulphide.

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Pau, France

Annie Commarieu