Hydraulic retractable fishing spear for horizontal well

• Main Authors: FAN ZHENGANG, TIAN SHENGMIN, HUANG DEHUI, SHAN MAOQING, LI LONG, WANG YUZHONG, ZHAO YONGJIE, HU YONGXIONG, WANG WENSHAN, PING ENSHUN, YU MEIMEI
• Format: Patent
• Language: Chinese; English
• Published: 19.06.2020
• 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 relates to a hydraulic retractable fishing spear for a horizontal well. The hydraulic retractable fishing spear for the horizontal well comprises an upper connector, a sleeve, a centralpipe, an upper piston cylinder, a lower piston cylinder, a fishing claw and a spear rod; one end of the sleeve is fixedly connected with the outer wall of one end of the upper connector, one end of the central pipe is fixedly connected with the inner wall of one end of the upper connector, and the upper piston cylinder and the lower piston cylinder are fixedly connected in a sleeved mode and forma lower liquid inlet groove from the inner wall of the lower piston cylinder to the interior of the lower piston cylinder, the lower liquid inlet groove can push the lower piston cylinder and the upper piston cylinder to slide simultaneously under action of pressure, the other end of the lower piston cylinder is connected with the fishing claw, slip inserts are formed at the tail end of the fishing claw, one end of the spe