Performance of polycrystalline diamond compact bit based on laboratory tests assuming geothermal well drilling

Process Modelling of Geothermal Drilling System Using Digital Twin for Real-Time Monitoring and Control

“…Efforts in making geothermal drilling more economical have been researched, with scientists focusing on material selection and bit design in making stronger and more wear resistant tool heads and better methods of project planning and management. According to research by Miyazaki et al [9], materials such as diamond bits and polycrystalline diamond (PDC) have been widely adopted in oil and gas drilling and research is ongoing on their suitability for geothermal application with promising preliminary research results. Drill bit designs also vary and include the conventional tri-cone roller and other innovations such as impregnated and dual-diameter bits as shown in Figure 2.…”

“…Real-time monitoring and data acquisition through the use of embedded sensors can aid in establishing the status of the down-hole motor and drill tip. This information in digital form can enable experienced engineers to mitigate drilling disruptions and tool extraction for inspection or repair [9,10]. However, the concept of digital twin facilitates an inexperienced personnel to real-time monitor and switch control the drilling process by virtually looking at the dynamic behaviour of the drilling bit such as speed, feed, irregularities, etc.…”

Wear and Degradation of Drilling Performance of Polycrystalline Diamond Compact Bit in Laboratory Test

“…As mentioned in Introduction, very little data has been reported on the effect of the rock type or rock properties on the wear or degradation of PDC bits. 17,18) Both rock type and UCS for drilled rock are generally thought to be important parameters affecting bit wear. As seen in Table 1, UCS for the Oga An., Shinkomatsu An., and Chigusa An.…”

“…10. Following the manner adopted in a previous study, 18) we classified the rock samples into several groups in accordance with their UCS, as designated in Fig. 10.…”

“…916) Although many reports on the performance of PDC bits for hard rocks or in geothermal fields have been published, the quantitative relationship between the wear and drilling performance degradation of PDC bits has not yet been sufficiently clarified, which is probably because it is extremely expensive to observe and measure bit wear repeatedly during a field drilling test in order to monitor the progress of bit wear, and it also takes much time and expense even in a laboratory drilling test. In addition, very little data has been published on the effect of the rock type or rock properties on the wear or degradation of PDC bits, 17,18) even though this issue is crucial in the estimation of the bit lifetime on the basis of geological information and the evaluation of their economic efficiency.…”