Societe Nationale Elf Aquitaine (production)

Elf Exploration Production

Michel Guillerme

Bernard Tramier

Christian Zurdo

Josiane Durrieu

Anne Basseres

Jaime Gratacos

Andre Sirvins

Alain Rabion

Laurent Fraisse

Bernard Gastou

Pierre Mountetou

Process for using biodegradable drilling muds, characterized in that a able surface sludge which is stable up to about 100&deg; C., with an adjustable filtrate-reducing power of from 2 to 13 cm depending on the amount of filtrate-reducing agent used, and with an electrical stability of greater than or equal to 1000 volts, is introduced into the well at the start of drilling, and in that, when the temperature of the terrain passed through reaches 100&deg; C., the surface sludge is replaced with a bottom sludge which is stable at a temperature above 200&deg; C., the volume of the surface sludge representing from 60 to 80% by volume relative to the total volume of sludge used.

Process for using biodegradable drilling muds

Biodegradable drilling mud and process for its preparation

Method for treating drilling effluents containing ligno-sulfonates wherein, successively, sulfuric acid is injected in order to cause coagulation, a cationic polyelectrolyte is injected to cause a flocculation and solids are separated from the liquid by centrifugation or dewatering compaction.

Treatment of aqueous drilling mud effluents containing lignosulfonates

Treatment of residual earth drilling muds to achieve a partial dehydration of the same by addition of a series of flocculating agents and then mechanically separating the liquid of the mud from the flocculated solids.

Treatment of residual earth drilling muds

Purification of the effluents from mineral oil drillings, carried out on land, for permitting the discharge of the residual waters into the natural surroundings. First, microorganisms are cultivated on a volume of the effluent, in order to make them capable of digesting the impurities of the effluent. The culture, thus obtained, is then developed in the mass of the effluent to be treated until the BOD is reduced to the required limit. This treatment is preferably followed by a flocculation with chemical agents in the known manner. This anti-pollution treatment permits the regulations in force to be applied in all locations where the drillings are undertaken, whatever may be the auxiliary fluids used in the drilling operation.

Purifying treatment for effluents of mineral oil drillings

Growing community of inventors

Serres Castet, France

Michel Guillerme