Well plugging and cementing materials feeder - has main and additional pistons to ensure adequate pressure

Device for feeding and processing materials in a given section of a bore hole comprises a tubular container (1) rigidly connected to a drill string via a limiter (3) and a cylinder (4) and containing the working material (6) in waterproof envelopes (5). The container lower part is sealed by a plug and holds a splitter while in its upper part above the envelopes is a main piston (9) with a rod (10) fixed to a stopper (11) cooperating with the limiter. An additional piston rigidly secured to the main piston rod is located in the cylinder and is in hydraulic communication with the drill string. The stopper is mounted on the rod at a distance from the main piston such that this is located in an extreme low position immediately above the splitter. The device can be used to plug spent wells, to cut out water-bearing formations and to form artificial bottom holes. The piston system ensures the required pressure for discharge of material and maintains pressure on the material while hardening for more reliable plugging. . 1/3. L'INVENTION CONCERNE LES TECHNIQUES DE FORAGE DU SOL.LE DISPOSITIF FAISANT L'OBJET DE L'INVENTION EST CARACTERISE EN CE QU'IL COMPREND UN CYLINDRE 4 MONTE ENTRE LE LIMITEUR 3 ET LE TRAIN DE TUBES DE FORAGE 2, RELIE MECANIQUEMENT AU TRAIN DE TUBES DE FORAGE 2 ET ASSEMBLE RIGIDEMENT AU LIMITEUR 3, AINSI QU'UN PISTON SUPPLEMENTAIRE 12 MONTE FIXE SUR LA TIGE 10 DU PISTON PRINCIPAL 9, PLACE DANS LEDIT CYLINDRE DE FACON QU'IL PUISSE COULISSER LE LONG DE CE DERNIER ET RELIE HYDRAULIQUEMENT AU TRAIN DE TUBES DE FORAGE 2, LE DISPOSITIF DE BLOCAGE 11 MONTE SUR LA TIGE 10 DU PISTON PRINCIPAL 9 ETANT SITUE, PAR RAPPORT AUDIT PISTON PRINCIPAL, A UNE DISTANCE ASSURANT LE BLOCAGE DE CELUI-CI EN POSITION BASSE DIRECTEMENT AU-DESSUS DE L'ELEMENT DIVISEUR 7.L'INVENTION PEUT ETRE UTILISEE EN PARTICULIER POUR LA CREATION DE COMPLEXES D'USOLEMENT LORS DU TAMPONNAGE DES FORAGES EN VUE DE LEUR LIQUIDATION APRES LEUR UTILISATION FONCTIONNELLE, LORS DE LA MISE EN PLACE DE BOUCHONS SEPARATEURS POUR ISOLER LES NIVEAUX AQUIFERES.