METHOD FOR REPAIR OF PRODUCTION CASING STRING IN WELL Russian patent published in 1997 - IPC

FIELD: development of stratified fluids. SUBSTANCE: method implies determining total value of deformation of beds opened by well, creating space under lower end of production casing string of depth equal to total value of deformation of beds, and applying axial thrust to production casing string. Additionally determined are intervals of beyond-string overflows of stratified fluids, production casing string is perforated in these intervals, and plugging material is injected through perforated holes into casing clearance with simultaneous subjecting production casing string to alternating axial loads. Usable as plugging material are clay-based compounds. Production casing string is perforated in this case in intervals of clay interlayer deposition. EFFECT: high efficiency. 2 cl