METHOD FOR VIBRATING CEMENTATION OF CASING PIPES IN WELLS Russian patent published in 1997 - IPC

FIELD: oil and gas production industry. SUBSTANCE: this method improves quality of cementation in slant and horizontal wells. According to method, applied to outer surface of casing pipes is layer of rare-earth element with magnetostriction properties. Casing pipes are lowered down into well. Then cement slurry is injected into casing pipes and is further pressure-forced into annular space. Brought to layer of rare-earth element is electric voltage of frequency equal to natural oscillation frequency of casing string. This is accompanied with heating of cement slurry to temperature of 40-50 C. Natural oscillation frequency of casing string is correlated with natural oscillation frequency of cement slurry. Oscillations of casing string are generated during period of time until strength of cement stone created from cement slurry in annular space reaches 0.5 of its normal design value. EFFECT: high frequency. 3 cl, 3 dwg