Abstract
Increasing drilling speed and efficiency of hard formation for deep and ultra-deep well is one of the international recognized drilling problems and key technologies to be tackled urgently. Particle jet impact drilling technology is an efficient non-contact rock-breaking method to overcome slow drilling speed, which has great development and application potential in drilling speed-increase of hard formation and deep well. High efficiency drilling technology and rock-breaking speed-increase mechanism in high temperature, high pressure and high hardness formations of deep and ultra-deep wells were mainly focused and keynoted in this paper. With extensive investigation of domestic and foreign literature, the working principle, key technical devices, deep-well-rock mechanical characteristic, unconventional constitutive model and rock-breaking mechanism of particle jet impact drilling technology were analyzed, which proved the feasibility and high efficiency for deep and hard stratum, and also, dynamic failure mechanism of rock needs to be elaborated by constructing the constitutive model with high temperature and pressure. Meanwhile, the major problems to be solved at present and development direction future were summarized, which mainly included: miniaturization of drilling equipment and individualization of drilling bit; optimization of jet parameters and the evaluation method of rock-breaking effect; establishment of mechanical property and unconventional constitutive model of deep-well-rock; rock-breaking mechanism and dynamic response under particle jet coupling impact. The research can help for better understanding of deep-well drilling speed-increasing technology and also promote the development and engineering application of particle jet impact drilling speed-increase theory and equipment.
Highlights
As the strategic resource, oil and gas resources are significant for economic security and sustainable development
For particle jet impact drilling speed-increasing technology, previous studies mostly focused on the overview of efficient rock-breaking methods and system devices, and few studies on the failure mechanism and the constitutive model with high temperature and high pressure of particle jet impact drilling
From 2005 to 2009, three generations of particle impact drilling devices have been successfully developed, and many laboratory tests and field tests had been carried out (Fig. 8a), and the results proved that particle impact drilling technology can save drilling cost and drilling time, and increase drilling speed by 2 ~ 4 times (Zhao et al 2014)
Summary
Oil and gas resources are significant for economic security and sustainable development. For particle jet impact drilling speed-increasing technology, previous studies mostly focused on the overview of efficient rock-breaking methods and system devices, and few studies on the failure mechanism and the constitutive model with high temperature and high pressure of particle jet impact drilling. (1) Without changing the existing drilling equipment and drilling technology, by connecting particle injection device and drilling bit, it maintenances the advantages of rotating bit and high-pressure water jet, Fig. 12 Particle jet impact rock-breaking mechanism and integrates the efficient impact of metal particles, and the rock-breaking effect is remarkable; (2) Low WOB (weight of bit), prolong the service life of equipment, reduce the down-hole accident frequency and shorten drilling cycle; (3) Less torque required, weaken the swing and fatigue damage of drill string, and prevent effectively well deviation; (4) Low rock-breaking threshold stress under high-speed particles impact, accelerate drilling speed, and save cost. The existing rock-breaking theory cannot fully reveal failure mechanism with particles-waterjet-mechanical action
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