Theoretical modeling and experimental study of rock-breaking depth in particle jet impact drilling process

Ren, Fushen; Fang, Tiancheng; Cheng, Xiaoze

doi:10.1016/j.petrol.2019.106419

Cited by 44 publications

(17 citation statements)

References 16 publications

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“…Particle jet coupled impact drilling technology was proposed based on projectile impact [ 9 , 18 ], and its working principle is to add a certain proportion of steel particles into the drilling fluid, and then the two-phase fluid would accelerate through the special nozzle to form subsonic particle waterjet. The high-velocity particle waterjet would firstly impact and break rock to form the pressure-relief pit on rock surface, which would release compaction stress in deep-well and the crushing strength of damaged rock would reduce greatly [ 5 , 16 ]. And then, the damaged rock would be formed to drilling hole under the action of rotary cutting and grinding by bit teeth.…”

Section: Working Principle and Rock-breaking Mechanismmentioning

confidence: 99%

“…Meanwhile, for the effective stress of elastic limit σ Hel : Where, F c is compressive strength, and it has been measured by rock compression test [ 16 , 30 ].…”

Section: Working Principle and Rock-breaking Mechanismmentioning

confidence: 99%

“…or shear stress exceeds the tensile or shear strength of rock respectively, many cracks or macroscopic failure will be formed inside rock [5,23]. At present, the failure models applied to impact and collision field mainly include Holmquist-Johnson-Cook (HJC) model, Drucker-Prager (DP) model, Riedel-Hiermaier-Thoma (RHT) model, and Johnson-Holmquist (JH-2) model [16,24,25]. HJC model is mainly used for brittle elastic materials such as glass and ceramics; DP model is mainly used to simulate ideal elastic-plastic models such as cohesive soil; RHT model is suitable for concrete materials; JH-2 model is expressed as the functions of pressure, damage and strain, which can realize dynamical simulation and analysis of rock fragmentation.…”

Section: Plos Onementioning

confidence: 99%

“…Kovalyov et al used the method of high-speed camera to capture the movement state of metal particles in the flow channel, and proposed a structural scheme of metal particles recycling in the drill [ 15 ]. Besides, the mechanism of rock failure was studied, and the matching relationship between particle size, impact velocity, fluid velocity and rock-breaking volume is proposed [ 16 , 17 ]. At present, these researches are mainly focused on fixed-point impact with single nozzle, and the researches on particle impact rock fracture in rotary drilling and cutting of bit are relatively lacking.…”

Section: Introductionmentioning

confidence: 99%

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Particle jet impact deep-rock in rotary drilling: Failure process and lab experiment

et al. 2021

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Aimed at the technical problems of low drilling speed and difficult rock-breaking in deep-well and hard rock-stratum, particle waterjet coupled impact rock-breaking technology in rotary drilling is put forward in this paper. Firstly, the working principle of particle jet impact rock-breaking in rotary drilling was introduced, and the acceleration model of particle jet and the damage model of rock were established. The acceleration mechanism of particles and dynamic damage evolution process of rock under particle jet were studied, which showed that the broken pit and rock damage would increase with time gone on, and damage evolution of rock presented the radial expansion. Then, experimental device of particle jet coupled impact rock-breaking in rotary state was developed, and the effect of jet parameters on penetration depth and failure volume was analyzed with comparison of la experiment and numerical simulation. The results showed that drilling speed with particle jet impact is twice that of conventional drilling, and combination nozzles layout of impact angle with 8°and 20° can achieve rock-drilled rapidly, which also demonstrated the correctness of simulation method. The device development and the rock-breaking results analysis would be of great value for engineering application.

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Section: Working Principle and Rock-breaking Mechanismmentioning

confidence: 99%

“…Meanwhile, for the effective stress of elastic limit σ Hel : Where, F c is compressive strength, and it has been measured by rock compression test [ 16 , 30 ].…”

Section: Working Principle and Rock-breaking Mechanismmentioning

confidence: 99%

Section: Plos Onementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Particle jet impact deep-rock in rotary drilling: Failure process and lab experiment

et al. 2021

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“…High‐pressure water jets have played important roles in increasing the drilling penetration rate 5‐8 . In 1985, with the support of Petrolphysics and Bechtel companies in the United States, W. Dickinson et al proposed the first‐generation hydraulic radial jet drilling (RJD) technology 9 .…”

Section: Introductionmentioning

confidence: 99%

Investigation of the factors affecting the self‐propelled force in a multi‐orifice nozzle using a novel simulation method

Zhang

2020

Energy Science & Engineering

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A multi‐orifice nozzle is the primary actuator of radial jet drilling for the stimulation of unconventional and low‐permeability reservoirs. This research developed a 3D flow field simulation model to investigate the self‐propelled force of a multi‐orifice nozzle based on ANSYS‐CFX. To evaluate the self‐propelled ability of the nozzle, investigation was performed on the effects of the angle, number, the diameter of the forward and backward orifices of the multi‐orifice nozzle, and the diameter of the micro‐hole in the radial well on its self‐propelled ability by sensitivity analysis. The results revealed that the self‐propelled force slightly increased with the angle of forward orifice increasing, and decreased with the angle of backward orifice increasing; and that the self‐propelled force had a tendency to decrease significantly with the number of forward orifices increasing, and increased slightly with the number of backward orifices increasing. The self‐propelled forces for different combinations of forward and backward orifices were obtained by the simulation method, which agreed well with those obtained by the calculation method, with an average accuracy of 95.82%. It was observed that the self‐propelled force increased substantially as the value of K (d2/d1) increased, but tended to slow down when the flow rate was within a certain range. Besides, with the increase in the diameter of the micro‐hole, the self‐propelled force reduced, and increased substantially as the inlet flow rate increased, but tended to slow down as the inlet flow rate further increased. Thus, to ensure the self‐propelled ability of the jet nozzle, a set of optimal structural parameters can be used to generate the target self‐propelled ability. The research improves the working performance of multi‐orifice nozzles and provides theoretical guidance for hydraulic radial jet drilling process.

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The effect of magnetic field on the electric breakdown trajectory of high‐voltage electric pulse rock breaking

Liu,

Zhou,

Zhu

2023

Contributions to Plasma Physics

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High‐voltage electric pulse drilling technology has the advantages of high rock‐breaking efficiency, low energy consumption for rock breaking, and good quality of well wall, which is a new and efficient potential rock‐breaking method. In this paper, we constructed a numerical simulation model of rock electric breakdown and realized the whole process of rock breaking and plasma channel generation by high‐voltage electric pulse. The results of the study showed that the change of magnetic field has a large influence on the formation of plasma channels inside the rock, and under the self‐magnetic field environment, the plasma channels inside the rock show branching, and the maximum penetration depth and maximum damage depth are higher than those under the non‐magnetic field environment. In the external magnetic field environment, the plasma channels gradually tend to develop “downward” (inside the rock), and the temperature distribution of the plasma channels inside the rock is more concentrated. In the presence of a magnetic field, the speed and degree of freedom of charged particles are limited. In an external magnetic field environment, the charged particles cause fewer particles to deviate, and the particles show a “downward” accumulation phenomenon. The research in this paper can provide certain theoretical and technical guidance for the development of electric pulse rock‐breaking technology and provide reference for the development and parameter optimization of electric pulse rock‐breaking tools.

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Theoretical modeling and experimental study of rock-breaking depth in particle jet impact drilling process

Cited by 44 publications

References 16 publications

Particle jet impact deep-rock in rotary drilling: Failure process and lab experiment

Particle jet impact deep-rock in rotary drilling: Failure process and lab experiment

Investigation of the factors affecting the self‐propelled force in a multi‐orifice nozzle using a novel simulation method

The effect of magnetic field on the electric breakdown trajectory of high‐voltage electric pulse rock breaking

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