Multifunctional compensation nipple for top drive casing running device

• Main Authors: LIU BENLIANG, TONG HONGYAN, DOU QIAO, LIANG HAIQING, ZHANG QINGBIN, SUN ZHANGUANG, KASUYA HIROSHI, YAN JIAZHEN, ZHANG XIN, WU PENG, WANG HUACHAO
• Format: Patent
• Language: Chinese; English
• Published: 05.08.2022
• 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

The invention discloses a multifunctional compensation nipple for a top drive lower casing device, which comprises a main shaft, an upper bearing end cover, a middle spline sleeve, a lower sealing sleeve and a compensation unit, the middle spline sleeve is clamped in the middle of the outer wall of the main shaft, and the upper end of the middle spline sleeve is in threaded connection with the upper bearing end cover; the lower end of the middle spline sleeve is connected with the lower sealing sleeve through threads, the lower end of the main shaft is inserted into an inner cavity of the lower sealing sleeve, a first guide ring and a sealing ring are arranged between the main shaft and the inner cavity, and a compensation unit is arranged in an annular cavity formed by the main shaft, the middle spline sleeve and the lower sealing sleeve. The compensation unit compensates the weight of a casing running tool and the weight of a casing, damage to precise threads caused by too large collision stress when the ca