| 摘要 |
FIELD: designs of oil, gas and other wells drilled in zones of occurrence of plastic rocks, in the intervals of manifestation of abnormally high external pressures. SUBSTANCE: well drilled in the internal of occurrence of plastic rocks includes a system of concentric casing strings including previously run casing string and subsequent casing string with reinforcing rings installed in the exterior surface of casings. Distance between neighboring ring ends is determined by the formula given the invention description. Axes of reinforcing rings on the pipes of subsequent string are displaced with respect to end faces of nearest rings on pipes of previous casing string through one half of calculated distance. Overall dimensions of rings (width and height) are equal to that of box joints of casings. Casings-borehole annulus and casing-casing annulus are filled with cement. EFFECT: higher reliability of well casing. 1 cl, 1 dwg |
