METHOD FOR CONSTRUCTION OF BOREHOLE IN UNDERGROUND FORMATION

摘要

FIELD: borehole construction in underground formation. SUBSTANCE: method for construction of borehole in underground formation includes hole drilling in underground formation, running-in the casing made of material capable of deforming in cold state. Casing capable of expansion in radial direction relative to borehole wall with application of radial load and has lower flexible radial deformation than enclosing formation with application of indicated load. Applied to casing is radial load to produce expansion of casing in radial direction relative to wall of borehole to produce compression force between casing and underground formation. EFFECT: higher efficiency. 11 cl, 6 dwg