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Innovative rock destruction process via laser technology and thermal spallation for faster and efficient drilling in mining, geothermal and other hard rock environments
Published in Vladimir Litvinenko, Innovation-Based Development of the Mineral Resources Sector: Challenges and Prospects, 2018
Shahin Jamali, Volker Wittig, Rolf Bracke
Today's drilling methods still heavily rely on technologies based on conventional rotary drill bits to mechanically break the rock and thus, having to mainly overcome its high strength and, furthermore, requiring large amounts of energy and time. Drilling technologies and processes from oil & gas industry have been continuously improved to make more efficient and economic drilling processes. However, drilling speeds or rates of penetration (ROP) of conventional drilling technologies suffer significantly in deep and hard formations (Gupta and Roy, 2006). Problems mainly include very low rate of penetration (1 m/hr. or less), very high bit/tool wear-rates and thus, the low service life of, e.g., under 50 hrs. (Lukawski et al., 2014). These problems lead to numerous, lengthy, and expensive round trips and consequently, very high overall drilling costs. Therefore, there is a great need for tools with higher ROP and low wear rates to reduce drilling trip time and cost. Consequently, a reduction of the forces acting on the mechanical drilling tools must be attained to enhance drill bit service life and reach higher rates of penetration (Glowka, 1985).
Machine Learning Applications in the Petroleum Industry
Published in Muhammad Asif, Handbook of Energy Transitions, 2023
Ahmed Abdulhamid Mahmoud, Salaheldin Elkatatny, Abdulazeez Abdulraheem
Optimizing borehole drillability is a very critical issue because of the high cost of the drilling operations. This section provides a summary of the most common applications of different machine learning models in estimating and optimizing the drillability of the hydrocarbon wells through the prediction of the rate of penetration (ROP). ROP is the rate at which the drillbit drills through the formation rocks and is measured as the number of feet drilled per hour of the drilling operation.
Least squares modeling of the depth of cut of reservoir rock from real-time drilling parameters
Published in Petroleum Science and Technology, 2022
Wilson Ekpotu, Joseph Akintola, Martins Obialor, Ayodeji Ayoola, Michael Asama, Yusuf Abdulkareem
Han, Sun, and Zhang (2019) observed that drilling is one of the most important aspects of resource development, and more specifically, oil field development. And based on this, a smooth drilling process can achieve safe and fast well establishment and better investment efficiency, while an accurate rate of penetration (ROP) estimation can benefit the well planning and prevent unexpected drilling accidents that could be caused by the nature of the cuttings returning to the shale shaker. (Khakzad, Khan, and Amyotte 2013). Similarly, many parameters influence the instantaneous ROP, which affects the depth of cut, and these parameters includes formation properties, mud rheology, drill bits, and bit/rock interactions, which gives an output into the nature of the cut of the reservoir rock, String vibrations, deformations, and bit fatigue which can also affect the rate of bit penetration (Ritto, Soize, and Sampaio 2010).
Rock breaking mechanism in percussive drilling with the effect of high frequency torsional vibration
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2022
Jialin Tian, Changyue Fan, Tangjia Zhang, Yi Zhou
In the present study of improving the ROP, many scholars mainly take a series of technical measures, such as optimizing the bit, optimizing the hydraulic parameters, and under-balanced drilling. In order to increase the ROP, several typical drilling technologies were proposed, such as rotary drilling, percussive drilling, percussive-rotary drilling (PRD), and high-pressure jet drilling (Dong and Chen 2018). PRD is developed from rotary drilling and percussive drilling, which take advantages of the bit vibrations and shocks. There is torsional impact drilling and axial hammer drilling (Dong and Chen 2016). Compared with conventional drilling, under the same WOB (weight-on-bit), PRD has been considered as a promising approach to improve the drilling performance in hard rock formation, offering economic benefits in terms of reducing drilling time and cost and can significantly improve drilling efficiency (Luiz 2011). But the major drawbacks of this technology are related to low penetration in soft formation, the service life of hydrodynamic hammer is very short. These disadvantages limit the applicability of the technology. On the other hand, high-pressure jet drilling is almost applicable to all formations, it plays an important role in improving the overall drilling speed, but it also has many shortcomings, such as cylinder liner bursts and piston breaks down easily with mud pump working in high pressure, high energy consumption, and nozzles plugging, so its application and promotion are severely limited (Potthast, Twiefel, and Wallaschek 2007; Xu 2004).
Working mechanism and experimental study of dual-diameter and bi-speed composite drilling tool
Published in International Journal of Green Energy, 2020
Jialin Tian, Xuehua Hu, Liming Dai, Liang Zhang, Heng Li, Xiaoyue Lin
In summary, with the increase of the rotate speed of the pilot bit of the Dual-diameter and bi-speed composite drilling tool, the ROP has increased significantly. As the rotation speed of the pilot bit increases, the axial vibration of the compound drilling tool and the risk of the stick-slip are increased. Therefore, the rotate-velocity combination has a great influence on the rock-breaking and speed-raising performance of the Dual-diameter and bi-speed composite drilling tool. By controlling the rotation velocity combination of the pilot bit and the reaming bit within a reasonable range, the ROP can be greatly improved to increase the ROP and drilling efficiency.