Development of the instrumented rotary drilling system for automatic measurement of rock properties
摘要
Rock mechanical properties play a crucial role in tunnel, mining, and petroleum engineering, and obtaining them conveniently is an urgent issue. In this study, a Rotary Drilling System Instrument (RDSI) is developed to enable continuous and real-time monitoring of drilling parameters during the drilling process, including torque, drilling speed, rotation speed, and drilling thrust. A new method is proposed for measuring rock properties and the interface between different rock layers. Experiments were conducted to study the characteristic response of lithology under intact rock and combined rock masses during the drilling process. The results indicated that the intelligent monitoring system can effectively enable smart control and real-time monitoring of critical drilling parameters. The finding is the variation in torque and drilling thrust values encountered during drilling into different rock formations. The distribution and variability of torque and drilling thrust values can be utilized as an effective means to distinguish between core pieces and non-core pieces. A field drilling test is performed at the Sanhekou Water Conservancy Project to effectively identify the distribution of rock strata and joints. The average value of drilling specific energy (DSE) remains within the average range of this type of lithology, which is 53.5 MJ/m3. The hardness, brittleness, and other properties of rocks can be indirectly assessed by monitoring the DSE. This research provides both theoretical and practical techniques, and advancing the field of geotechnical engineering.