METHOD OF BOREHOLE FIXING Russian patent published in 1996 - IPC

FIELD: borehole drilling. SUBSTANCE: in agreement with method casing strings are lowered into boreholes passing through ductile rocks. Then cement mortar is pumped into interpipe space and hole clearance. Cement mortar is pumped into interpipe space from face of borehole to floor of ductile rocks and from roof of ductile rocks to hole head. Viscous-elastic fluid is pumped into interval from floor up to roof of ductile rocks. Compression coefficient β. of viscous-elastic fluid is chosen from relation given in text of description. EFFECT: increased reliability of fixing of borehole under conditions of flow of rocks without any additional expenditures for enhancement of thickness of walls of casing pipes and with due account of their strength. 2 dwg