METHOD FOR ELIMINATION OF LEAKAGE IN TUBING STRING Russian patent published in 2013 - IPC E21B29/02 E21B33/10 

FIELD: oil and gas industry.

SUBSTANCE: method for elimination of leakage in tubing string includes survey of tubing string inside the well with detection of leakage location, installation of sealing device at the ground level which consists of deformed plastic material device with explosive charge and exploding initiator inside it; the device can pass freely inside tubing sting and cover leakage in tubing string. Exploding initiator is connected to trigger pulse conductor which is connected to detonating system at the ground level; thereafter sealing device is equipped with load, pattern and flow metre interconnected in-series, sealing device is run-in inside tubing string with load, pattern and flow metre and placed at leakage location point. Running-in is made at logging cable; then explosion of sealing device is made with further sealing of tubing leakage by means of its filling and fixation with plastic material; polymer sealing compound hardened in result of plastic deformation and detonation is used as deformed plastic material.

EFFECT: invention allows increasing efficiency and reliability of tubing string repair.

2 cl, 1 dwg