Cement sheath eccentric rolling extrusion crushing tool for long-service-life auxiliary sleeve recovery

• Main Authors: JING JIAJIA, CHEN MINGFU, WANG DANGFEI, WANG GUORONG, XUE CHENGGANG, LIU XIAOPING, FENG QING, ZHONG LIN, ZHANG LINFENG, ZENG QINTAO, HU GANG
• Format: Patent
• Language: Chinese; English
• Published: 09.08.2022
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

A long-service-life cement sheath eccentric rolling extrusion crushing tool assisting in casing recycling comprises a main shaft, an upper roller, a piston, a torque clamping sleeve, a movable roller, a lower roller, bearings, a centralizer and a lower connector, the movable roller is installed on the main shaft through the two sets of bearings and the torque clamping sleeve under the action of the centralizer, and the movable roller is located between the upper roller and the lower roller; an upper roller and a lower roller are mounted on the main shaft through two groups of bearings, a lower joint is mounted at the bottom of the main shaft in a threaded connection manner, a cylindrical water nozzle is formed in the lower joint, the internal throttling pressure difference of the tool can be controlled by adjusting the diameter of the cylindrical water nozzle, the total lateral thrust of a piston is controlled, and the movable roller'rolls' a sleeve in a rolling contact manner; the process is similar to the r