Intelligent Fault-Diagnosis System for Acoustic Logging Tool Based on Multi-Technology Fusion

Abstract

To improve the performance of acoustic logging tool in detecting three-dimensional formation, larger and more complicated transducer arrays have been used, which will greatly increase the difficulty of fault diagnosis during tool assembly and maintenance. As a result, traditional passive diagnostic methods become inefficient, and very skilled assemblers and maintainers are required. In this study, fault-diagnosis requirement for the acoustic logging tool at different levels has been analyzed from the perspective of the tool designer. An intelligent fault-diagnosis system consisting of a master-slave hardware architecture and a systemic diagnosis strategy was developed. The hardware system is based on the embedded technology, while the diagnosis strategy is built upon fault-tree analysis and data-driven methods. Diagnostic practice shows that this intelligent system can achieve four levels of fault diagnosis for the acoustic logging tool: System, subsystem, circuit board, and component. This study provided a more rigorous and professional fault diagnosis during tool assembly and maintenance. It is expected that this proposed method would be of great help in achieving cost reduction and improving work efficiency.

Numerical Simulation Study on the Influence of Fracture on Borehole Wave Modes: Insights from Fracture Width, Filling Condition, and Acoustic Frequency

“…Consequently, the evaluation of fractures in these reservoirs has become critical. The research on fracture evaluation is mainly carried out from two aspects: physical experiments [5][6][7][8][9][10][11] and numerical simulations [12][13][14][15][16][17][18]. Currently, various methods are used to assess fractures, such as the dual lateral resistivity difference method, dipole shear wave anisotropy method, borehole wave modes' attenuation method, Stoneley wave reflection coefficient method, and others.…”

Design of a New Acoustic Logging While Drilling Tool

“…To improve the signal-to-noise ratio of the reception signals, we adopted an intellectualized active reception transducer, and thereafter, selected 32 reception transducers of obvious consistency. Based on the above technologies, a new acoustic LWD tool was designed and tested [ 19 ].…”

Design of a New Seismoelectric Logging Instrument

“…The whole detector was connected to the Eilog system during the field testing, and ideal results were obtained [23]. The China University of Petroleum developed a new generation of seismoelectric logging detectors, which are currently undergoing laboratory and field tests [24][25][26]. Guan et al proposed a method to invert permeability from seismoelectric logs in fluid-saturated porous formations, which has a guiding effect on actual data processing [27,28].…”