METHOD OF DETERMINATION OF UPPER BOUNDARY OF STICKING ZONE OF STRING OF DRILL PIPES IN HOLE Russian patent published in 1996 - IPC

FIELD: hole drilling. SUBSTANCE: shock hydrodynamic waves of pressure are formed in hole clearance. Parameters of wave fields are measured by pressure transducers installed in hole clearance and are registered on oscillograph screen. By obtained shock diagrams time of trip by shock wave of distance between transducers and time of double trip of shock wave of distance from hole head to upper boundary of sticking zone are determined. Then depth of upper boundary of sticking zone is found by mathematical formula. EFFECT: increased authenticity of method. 1 dwg