An inner tube weighted rope fishing sealed coring drill
By incorporating a weighted component and a thrust bearing into the inner tube-weighted wireline retrieval closed coring drill bit, the problems of inner tube movement and wear caused by the traditional spring-loaded suspension structure are solved, thereby improving the safety and reliability of the drill bit.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GEOPHYSICAL & GEOCHEMICAL SURVEY INSTITUTE OF HUNAN PROVINCE
- Filing Date
- 2026-06-01
- Publication Date
- 2026-07-17
AI Technical Summary
In traditional spring-loaded suspension structures, the inner tube assembly is prone to upward movement during drilling, causing radial wear of the core by the inner drill bit, and may lead to failure of inner tube extraction and wire rope breakage.
The inner tube weighted rope retrieval closed coring drill bit is adopted. By setting a weight between the retrieval spearhead and the inner tube assembly, and using a thrust bearing to connect the second drill bit and the first drill bit, the traditional spring clip suspension structure is replaced, which increases the counterweight of the inner tube assembly and avoids movement and wear.
It improves the safety and reliability of drilling tools, avoids failure of inner tube extraction and wire rope breakage, and reduces wear on the core.
Smart Images
Figure CN122407094A_ABST