The Development and Application of a High Efficiency Hydraulic Casing Restoration Tool

At present, operations related to the restoration of deformed casing in the Liaohe Oilfield can be characterized by low success rates, long operation duration and high costs. Based on the principles of hydraulic boosting and rolling ball squeezing, a high efficiency hydraulic casing restoration tool has been developed, which is composed of a shaping head, pressure cylinder, pressure relief device and hydraulic anchoring device. Experimental results showed that the hydraulic casing shaping tool possessed high shaping efficiency, the average single well restoration duration was reduced by 40% from the original state. With less damage to the casing, the newly developed tool could be used to achieve maximum restoration of inner size of the casing. This tool has been used in the casing restoration of 13 wells in the Liaohe Oilfield and experienced success in 12 wells, resulting in a success rate of 92.3%. Both research results and application performances showed that the hydraulic casing restoration tool could be used for casing restoration of wells with deformed casing to meet the demands for casing re-shaping in the Liaohe Oilfield.