GEAR TO JOIN AND GROUT SECTIONS OF CASING STRINGS Russian patent published in 2000 - IPC

FIELD: construction of oil and gas wells, joining and grouting of casing strings lowered by sections. SUBSTANCE: proposed gear includes bell mouth with conical surface mounted on lower section. Body is coupled to section of casing string located above. Body has radial holes where diaphragms are fixed. Sleeve is anchored coaxially to body, it is anchored by means of shear members and is mounted for axial movement. Sleeve also has radial holes shut off by diaphragms. Gear has directing plug with central hole and release ball. Lowering of release ball for opening of flushing holes in disconnector is determined by formula. EFFECT: enhanced reliability of joining of sections of casing string under control and grouting of upper section in joined state. 2 cl, 2 dwg