Well mouth anti-hanging device

• Main Authors: ZHANG JIE, DENG HUI, LIU DEPING, GU GUANGPING, YANG YONG
• Format: Patent
• Language: English
• Published: 14.01.2015
• 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 utility model provides a well mouth anti-hanging device. The well mouth anti-hanging device comprises a guiding and centralizing device and a feeding pipe and is characterized in that a casing trapezoid outer buckle is arranged on the outer wall of the upper portion of the guiding and centralizing device, and the inner wall of the upper portion of the guiding and centralizing device has big-end-up taper. A limiting step is arranged between the upper portion and the middle portion of the guiding and centralizing device. A casing head inner positioning annular groove is formed in the outer wall of the lower portion of the guiding and centralizing device, and the inner wall of the lower portion of the guiding and centralizing device has big-end-down taper. The outer diameter of two ends of the feeding pipe is large, the outer diameter of the middle of the feeding pipe is small, a casing trapezoid inner buckle is arranged on the inner wall of the lower portion of the feeding pipe, and a hoisting hole for a steel wire rope to penetrate is formed in the upper portion of the feeding pipe. The guiding and centralizing device is put into a casing head to prevent the hanging or clamping phenomenon occurred on an inner step of a well mouth device during tripping operation after drill rod joints expand. The safe tripping operation of the expanded joints can be performed at normal speed, acceleration of complicated accident handling progress can be facilitated, accidental loss can be reduced, and the well mouth anti-hanging device can be widely applied to petroleum and gas drilling.