The effects of process parameters on the rock-breaking efficiency of multi-nozzle jet

He, Lipeng; Liu, Yanbao; Wu, Yueshen; Sun, Haitao; Shen, Kai; Yang, Xuelin

doi:10.1016/j.petrol.2021.108857

Cited by 7 publications

(3 citation statements)

References 25 publications

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“…Cao et al [7] investigated the effect of the structural parameters of the drill bit used in the Casing-while-Drilling technology on its rock cuttings carrying capacity and reverse circulation performance. He et al [8] verified effect of multinozzle bit on sandstone by numerical simulation and indoor experiment, however, nozzle fluid medium is water. Luo et al [9] designed a specially structured drill bit for a reverse circulation down-the-hole air hammer.…”

Section: Introductionmentioning

confidence: 99%

Optimization Design of Mining Tri-cone Bit Air Nozzle by CFD

Yan,

Wang,

Tang

et al. 2024

J. Phys.: Conf. Ser.

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Performance of the air nozzle of the mine tri-cone bit directly affects life of bit and rock breaking efficiency. The shape of air nozzle influences performance of mine tri-cone bit. It is necessary to optimize the shape of the air nozzle of tri-cone drill bits. The general specifications of gas mine tri-cone bit were analysed. Working condition and parameters of the air nozzle of the mine tri-cone bit were determined. A three-dimensional model of the air nozzle of the mine tri-cone bit was established. The characteristic geometry and range of air nozzle were determined. The performance index of air nozzle was proposed. An orthogonal experiment table of characteristic geometry of air nozzle was established. The ranking of influence weights of characteristic geometry was obtained. Key characteristic geometry which affects the performance of air nozzle was also obtained. This thesis work helps to improve the working performance of the gas nozzle of the three-cone bit. It can provide some reference ideas for the optimized design of the cone bit

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Section: Introductionmentioning

confidence: 99%

Optimization Design of Mining Tri-cone Bit Air Nozzle by CFD

Yan,

Wang,

Tang

et al. 2024

J. Phys.: Conf. Ser.

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“…2,3 It is worth mentioning that due to the stimulation of various industries, high-speed water jet technology has achieved significant progress in the past few decades. [4][5][6] With its unique advantages of environmental protection and high efficiency, high-pressure water jets are widely used in energy industries for applications, such as quarry rock-breaking, 7,8 coal seam drilling, 9,10 oil drilling, 11 geothermal exploitation, 12 and deep-sea shallow drilling. 13 In summary, the high-pressure water jet is considered one of the most promising assisted rockbreaking technologies and can further improve the rate of penetration.…”

Section: Introductionmentioning

confidence: 99%

Effects of pulsating fluid at nozzle inlet on the output characteristics of common and self‐excited oscillation nozzle

Feng

Wang

Kong

2022

Energy Science & Engineering

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High-speed water jets are key technologies for increased production efficiency in oil drilling, and high-speed self-excited oscillating pulsed water jets (SEOPWs) offer many advantages compared to continuous jets for most industrial applications. Therefore, many studies have focused on this topic.However, the current studies on hydraulic pulsed jets have rarely extended to integrated modeling of the high-speed water jet transmission process. To better apply the SEOPWs, based on fluid mechanics, the theoretical model of the plunger pump-pipeline-nozzle is established, and the sensitivity of different nozzles on the pulsating fluid is studied in the time domain.Furthermore, the vibration characteristics of the nozzle are further investigated in the frequency domain. The results show that the common nozzle has an enlarged role in the pressure amplitude, the Helmholtz nozzle enlarges the pressure peak and amplitude, and the amplification is more obvious with the speedy growth on the plunger pump. However, as the pipeline becomes longer, the difference between the pressure of the inlet and outlet does not change. Therefore, the nozzle is more sensitive to the change in the plunger pump speed. In the frequency domain, the secondary frequency peak for the Helmholtz nozzle is 1.26 times larger than the interference frequency, while it is 1.08 times for the common nozzle. Helmholtz nozzles tend to produce stronger natural vibrations than common nozzles. By comparing the impact force, the experimental results show good agreement with the simulated results. The study provides a theoretical basis for water jet-assisted drilling in deep wells and lays the foundation for the better application of self-oscillating impact drilling tools.

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“…At present, the jets used for drilling can be divided into three types: straight, swirling, and a combination. [17][18][19][20] For a straight jet, He et al 21 examined the effect of multinozzle bit on sandstone specimens by means of numerical simulation and experiment and verified the rationality. Liu et al 14 adopted the FLUENT combined with RNG turbulence model to analyze the multinozzle jets flow field and study the effects of inclination-angle of forward nozzles and standoff distance.…”

Section: Introductionmentioning

confidence: 99%

Internal flow field and rock‐breaking characteristics of a straight‐swirling mixed jet and its influential factors in radial jet drilling

Peng

Wei

et al. 2022

Energy Science & Engineering

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The use of radial jet drilling (RJD) to exploit unconventional natural gas is an attractive study area. A self‐propelled bit enormously affects the drilling efficiency. Herein, for a straight‐swirling mixed jet (SSMJ) bit, the internal and external velocity fields were analyzed using a simulation to reveal a jet mixed mechanism. The rock‐breaking characteristics of different bit structures were investigated using laboratory experiments. A straight jet and a swirling jet were independent flowing through the impeller and were gradually mixed together in the mixing chamber inside the bit. The jets' boundary gradually dissipated along the radial direction, and the swirling jet distribution along the circumferential direction tended to be uniform. The velocity vector gradually decreased from the center to the periphery, and the energies were slowly concentrated due to the cluster‐narrowing by the conical wall until the velocity at the nozzle outlet reached its peak. Different flow fields were modulated by changing the bit structures. The diameters ratio greatly affected the distribution proportion of straight and swirling; the length‐diameter ratio primarily affected the contribution of the swirling jet to its center, and the width‐diameter ratio chiefly affected the initial formation velocity of the swirling jet, which all directly affected the depth variation along the radial and diameter of a borehole. The hole depth and diameter, erosion volume, and bottom flatness were combined to evaluate the rock‐breaking performance. The bit with a diameters ratio of 0.67, a length‐radius ratio of 0.57, and the width‐radius ratio of 0.13 had the best erosion effect. The simulation and experimental results achieved good mutual verifications. Overall, this study can guide research on the SSMJ rock‐breaking mechanism and bit design for RJD.

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The effects of process parameters on the rock-breaking efficiency of multi-nozzle jet

Cited by 7 publications

References 25 publications

Optimization Design of Mining Tri-cone Bit Air Nozzle by CFD

Optimization Design of Mining Tri-cone Bit Air Nozzle by CFD

Effects of pulsating fluid at nozzle inlet on the output characteristics of common and self‐excited oscillation nozzle

Internal flow field and rock‐breaking characteristics of a straight‐swirling mixed jet and its influential factors in radial jet drilling

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