DEVICE FOR BINDING CASING COLUMNS ON WELL MOUTH (VARIANTS) Russian patent published in 2004 - IPC

FIELD: oil and gas extracting industry. SUBSTANCE: lower body is mounted on a jig, which has ports for studs and a groove for sealing ring. Lower body has ring-shaped conical surface in contact with respective conical surface made on the joint, and grooves for mounting compacting collars, made on side inner surface. In lower body on opposite sides threaded apertures are made for branches of inter-column spaces. Collar is made in form of a ring and has thread for supporting column of casing string. Upper part of collar has grooves for connecting branches inter-pipe space. Collar is placed inside the lower body under the upper body, which has two concentric rows of apertures: apertures of outer row are made through for studs, which connect upper an lower bodies, and apertures of inner row are made solid for studs which connect upper body, for example, with a flange of fountain armature and additional body. Apertures of inner row are made displaced relatively to apertures of outer row for a half of one step. According to second variant of construction, an additional body is placed between upper body and fountain armature flange, with additional wedge pipe holder and additional branch of inter-pipe space. EFFECT: lesser height of column binding, easier assemblage and operation, higher reliability and safety of the whole construction, device may be used with different numbers of pipe columns. 2 cl, 7 dwg