Study of the rock-breaking and drilling performance of a self-rotatory water-jet bit in water-jet drilling and its influential factors

Xiao, Songqiang; Ren, Qingyang; Ge, Zhaolong; Chen, Bin; Wang, Feifei

doi:10.1080/15567036.2020.1767732

Cited by 9 publications

(3 citation statements)

References 17 publications

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“…Sci. 2023, 13, 5393 2 of 21 and making it suitable for breaking and tunneling different strata [16][17][18]. The PWJ is superior to the CWJ in many aspects because of its unique erosion ability.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Granite Erosion Characteristics of a Variable Cross-Section Squeezed Pulsed Water Jet

et al. 2023

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The exploitation of deep resources and energy needs to break hard rock. Aiming at the problem of deep hard rock fragmentation, this paper proposes a variable cross-section squeezing pulsed water jet technology (SPWJ). SPWJ was generated under pump pressures of 5.2, 6.8, 8.5, 10, 11.9, and 13.8 MPa to carry out erosion experiments. Features such as rock spalling area, erosion depth, volume loss, and decomposition per unit inlet pressure are used to characterize the erosion performance of SPWJ. The results show that SPWJ can effectively crush granite under low input pressure. Granite crushing modes caused by SPWJ are mainly divided into three types: I: drilling type, II: erosion type, and III: cracking type. Compared with continuous water jet (CWJ), SPWJ has better overall erosion ability than CWJ when the erosion pressure is higher than 60 MPa, the dimensionless target distance is greater than 200, and the erosion time is less than 90 s. In addition, the erosion ability of SPWJ is better than that of CWJ under the condition of unit input pressure. The research results provide a reference for further optimizing the performance of SPWJ crushed granite in the future.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Granite Erosion Characteristics of a Variable Cross-Section Squeezed Pulsed Water Jet

et al. 2023

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“…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. Xiao et al 22 established the three‐dimension drilling model of the self‐rotatory water‐jet bit, and conducted the numerical simulation of this model based on the sliding mesh model combined with RNG turbulence model; for a swirling jet, there has a central low‐speed zone, which will reduce the drilling efficiency 23 ; for a combination jet, a dual‐jet 24,25 can combine the advantages of both a straight and a swirling jet, however, its complex structure and larger volume mass limit its wide use in RJD. Buckman et al 26 designed a straight‐swirling mixed jet (SSMJ), which has a smaller size due to the change in the structural shape of the impeller, thereby making it suitable in RJD.…”

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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“…Pipesticking is the main factor affecting the process of drilling borehole in soft outburst coal seam, while the coal slag blockage is the main cause of the pipe-sticking. ere are many drilling technologies for soft outburst coal seam [12,13], such as hydraulic slag discharge drilling, auger pipe slag discharge drilling, air atomized drilling [14], foam drilling [15], and casing drilling [16]. ese drilling technologies can be divided into two categories according to the method of slag discharge: one is by the mechanical force generated from the rotation of the drill pipe, and the other one is by the fluid force.…”

Section: Introductionmentioning

confidence: 99%

Structure Optimization of Rib Drill Pipe Based on Gas-Solid Coupling and Orthogonal Experiment

Zhong

et al. 2020

Shock and Vibration

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At present, drilling rig is a common equipment for controlling gas outburst generated in underground coal mine, and rib drill pipe is an important component of drilling rig. Due to the insufficiency of slag discharge capacity, pipe-sticking accidents often occur during the drilling process, which greatly reduces the effect of gas control. In order to improve the capacity of slag discharge of rib drill pipe, the mechanism of slag removal was analyzed, and the process of slag discharge was simulated as a gas-solid two-phase flow coupling process. Utilizing the computational fluid dynamics method, the process of slag discharge was simulated on the Edem-Fluent cosimulation platform. The structural parameters of the drill pipe affecting the capacity of slag discharge were derived. Based on the analysis results, the structural parameters of rib drill pipe were optimized by orthogonal experiment method. The global optimal results were obtained as follows: its pitch, blade height, and blade width are 120 mm, 3 mm, and 15 mm, respectively. Therefore, the results of slag discharge experiment on the optimum structure of rig drill pipe show that the slag discharge efficiency is increased by 11.38%, which effectively resolves the pipe-sticking problem.

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Study of the rock-breaking and drilling performance of a self-rotatory water-jet bit in water-jet drilling and its influential factors

Cited by 9 publications

References 17 publications

Experimental Investigation on the Granite Erosion Characteristics of a Variable Cross-Section Squeezed Pulsed Water Jet

Experimental Investigation on the Granite Erosion Characteristics of a Variable Cross-Section Squeezed Pulsed Water Jet

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

Structure Optimization of Rib Drill Pipe Based on Gas-Solid Coupling and Orthogonal Experiment

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