Controllable lifting and releasing fishing spear

• Main Authors: WANG FENKANG, ZHANG ZHENSHAN, LI ZENGWEI, XIA LIGUO, LI NA, BI XINZHONG, ZHANG GUANGHUI, LI HUABIN
• Format: Patent
• Language: Chinese; English
• Published: 07.05.2014
• 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 controllable lifting and releasing fishing spear comprises an upper connector (1), a left-hand connector (2), a sliding sleeve (3), a slip (4) and a mandrel (5). The controllable lifting and releasing fishing spear is characterized in that the controllable lifting and releasing fishing spear is of a four-level-step cylinder structure, internal threads are arranged on the upper portion of the upper connector (1), the lower portion of the upper connector (1) is connected with the left-hand connector (2) through left-hand threads, the left-hand connector (2) is provided with internal threads, the sliding sleeve (3) is movably connected with the upper portion of the slip (4) and arranged on the mandrel (5) in a sleeved mode, and external threads on the upper portion of the mandrel (5) are connected with the internal threads of the left-hand connector (2). The controllable lifting and releasing fishing spear is novel in structure and convenient to operate, improves the first-pass yield of construction, reduces l