ELECTROMECHANICAL CORE TOOL Russian patent published in 2003 - IPC

FIELD: oil and gas industry, cleaning of filtration zone of productive pool and casings of well. SUBSTANCE: tool has core tube linked with lower butt to separable bit, core-taking tube, screen filter placed in sludge tube, reduction gear with hollow shaft coupled to shaft of electric motor, pump and cable lock put on upper butt of spacer unit. Tool is equipped with separable catching shoe or shoes for cleaning to retrieve objects dropped to well bottom and to clean filtration zone of productive poll and casings while separable bit is dismantled. Pump is fixed on elongated shaft of electric motor between reduction gear and electric motor. Contact surfaces of spacer unit come in the form of rollers. EFFECT: widened potential of electromechanical core tool thanks to preliminary drilling of interval of productive pool for removal of rock sediments from well and for subsequent cleaning of filtration zone of pool and casings of well. 3 cl, 4 dwg