A strain gauge assembly for a smart bit and a method of data coupling and decoupling
By deploying multi-layer thin-film strain measurement nodes and a load coupling matrix decoupling algorithm on the PDC drill bit, the problem of mounting traditional strain gauges on complex curved surfaces is solved, enabling accurate measurement and condition identification of multi-component downhole loads, and improving the measurement accuracy and stability of the smart drill bit.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHENGDU UNIVERSITY OF TECHNOLOGY
- Filing Date
- 2026-04-21
- Publication Date
- 2026-07-17
AI Technical Summary
Existing technologies make it difficult to reliably mount strain gauges on the complex curved surfaces of PDC drill bits, and the high-temperature environment downhole affects measurement accuracy. Furthermore, the multi-channel strain signal decoupling algorithm is inadequate, resulting in low load inversion accuracy and failing to meet the requirements of accurate decoupling of multi-component loads in smart drill bits.
A multi-layer thin-film strain measurement node is arranged on the PDC drill bit body, including a transition layer, an insulating layer, a strain-sensitive layer, a conductive lead-out layer, and a protective layer. Axial, circumferential, and oblique sensitive grids and temperature compensation grids are set. Combined with load coupling matrix and decoupling algorithm, temperature compensation and accurate decoupling of multi-channel signals are realized.
It solves the problem of mounting traditional strain gauges on complex curved surfaces, improves the accuracy and stability of downhole measurements, can accurately acquire multi-component load information, and supports the condition identification and optimized control of intelligent drill bits.
Smart Images
Figure CN122409016A_ABST