Optimizing the Structure of the Straight Cone Nozzle and the Parameters of Borehole Hydraulic Mining for Huadian Oil Shale Based on Experimental Research

Wen, Junjie; Chen, Chen

doi:10.3390/en10122021

Cited by 14 publications

(26 citation statements)

References 7 publications

(7 reference statements)

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“…In the practice, the straight cone nozzle is the most commonly used for HPJG, as shown in Figure 1 and Figure 2. The straight cone nozzle mainly consists of three parts: connection section, contraction section, outlet section [11][12]. For the normal nozzle, the all of the internal surfaces are smooth.…”

Section: Structures Of Nozzles For Hpjgmentioning

confidence: 99%

Research on the Bionic Non-Smooth Nozzle for High-Pressure Jet Grouting Based on Computational Fluid Dynamics

Wen¹

2019

Proceedings of the 2019 2nd International Conference on Sustainable Energy, Environment and Information Engineering (SEEIE 2019

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In the practical engineering, high-pressure jet grouting (HPJG) has been widely used for reinforcing the soil mass and preventing seepage in the many different fields. Nozzle is the crucial component for HPJG, its hydraulic characteristics determine the working efficiency of HPJG directly. The bionic non-smooth technology is applied to design the nozzle's internal structure. According to the computational fluid dynamics (CFD) to compare the hydraulic characteristics of the normal nozzle and the bionic non-smooth nozzle, comparing the values of impact forces of high-pressure cement-slurry jets impact on the soil mass surfaces ejected by them, the value of bionic non-smooth nozzle is 17.05 N bigger than the normal nozzle. The relevant results show that the bionic non-smooth nozzle has better hydraulic characteristics. In addition, the grooves with equal intervals on the inner walls make the nozzle with a non-smooth surface. Moreover, the opposite rotational vortexes in the grooves on the inner walls of the bionic non-smooth nozzle are the main reason for increasing efficiency and reducing energy consumption.

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Section: Structures Of Nozzles For Hpjgmentioning

confidence: 99%

Research on the Bionic Non-Smooth Nozzle for High-Pressure Jet Grouting Based on Computational Fluid Dynamics

Wen¹

2019

Proceedings of the 2019 2nd International Conference on Sustainable Energy, Environment and Information Engineering (SEEIE 2019

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“…There are many types of nozzle that can produce the direct water jet such as: the straight cone nozzle, conical nozzle, arc inlet nozzle, elliptical inlet nozzle, etc. However, based on comprehensive considerations such as: machining processes, working efficiency, applicability condition, and costs; it is concluded that the best and the most widely used nozzle is the straight cone nozzle [ 14 , 18 – 25 ].…”

Section: Theories Of High Pressure Water Jetmentioning

confidence: 99%

“…As mentioned above, the most critical step in the entire borehole hydraulic mining process is breaking the underground oil shale by the high-pressure water jet produced by the jet device. The outcome of this step will directly determine the success and efficiency of the mining process [ 14 – 18 ]. Additionally, in this study, the straight-cone nozzle, self-resonating cavitating jet nozzle, and self-excited oscillation pulsed jet nozzle are collectively referred to as the jet devices.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, their jet performance will directly influence the mining outcome for the underground oil shale. Moreover, the mining parameters also play crucial roles in the mining process [ 12 – 18 ]. Therefore, this study aims to compare the jet performances of the different jet devices, and propose the parameters for borehole hydraulic mining of Huadian oil shale in China.…”

Section: Introductionmentioning

confidence: 99%

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Experimental research on the performances of water jet devices and proposing the parameters of borehole hydraulic mining for oil shale

2018

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Oil shale is an unconventional energy source, and it is also a potential petroleum substitute. Nowadays, the energy shortage is becoming more and more prominent, oil shale has attracted the attention of energy researchers all over the world. Borehole hydraulic mining is an effective method to exploit the underground oil shale which has more prominent advantages than other conventional mining methods. Jet devices are the key component of borehole hydraulic mining, which include the straight cone nozzle, organ pipe nozzle and self-excited oscillation pulsed jet nozzle. Also, the reasonable mining parameters are also crucial in mining underground oil shale efficiency. The jet characteristics of the non-submerged water jet, submerged water jet, direct water jet, cavitating water jet, and pulsed water jet are also explained and compared based on theoretical analysis. The jet performance of the non-submerged water jet is better than the submerged water jet. Each type of jet devices has its own basic principles and optimal structural parameters. The best operating scheme of borehole hydraulic mining for underground oil shale is to use the pulsed water jet which is produced by the self-excited oscillation pulsed jet nozzle to break underground oil shale under the non-submerged condition. Moreover, the pulsed water jet should be placed parallel to the oil shale bedding. In addition, under the preconditions of ensuring the safety and reliability of the hydraulic mining equipment and pipelines connection, the jet pressure and jet flow should be raised as much as possible, so as to obtain the much higher mining efficiency. These results and conclusions can provide very valuable guidance for borehole hydraulic mining of underground oil shale.

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“…Taherdangkoo et al [4] proposed a new predicting scheme to evaluate bottomhole circulating pressure in petroleum industry and this method was able to predict the complex relationship between inputs and outputs of a highly nonlinear system. Wen et al [5] comprehensively analyzed the results of an orthogonal experimental design and demonstrated the optimal structural parameters of a straight cone nozzle. Ge et al [6] proposed a novel method that used a self-propelled water-jet nozzle to dredge blocked boreholes in coal seams in order to improve the coal bed methane output and coal mine safety.…”

Section: Introductionmentioning

confidence: 99%

Impact Performance of Helmholtz Self-Excited Oscillation Waterjets Used for Underground Mining

Fang

Gao²,

Xia

et al. 2019

Applied Sciences

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Featured Application: The paper will provide nozzle selection basis and impact mechanism of Helmholtz self-excited oscillation waterjets used for underground mining.Abstract: Pulsed waterjets are widely used in exploitation of fossil fuels for their high efficiency.With the aim to further clarify the impact performance of Helmholtz self-excited oscillation waterjets (HSEOW), numerical and experimental studies were conducted. The morphological characteristics of the erosion surfaces between conical and HSEOW nozzles were compared and the cavitation evolution was obtained. Results show that the cavitation damage caused by the HSEOW nozzle on the specimen was mainly caused by the jet cavitation cloud under submerged conditions. The cavitation effect produced by the HSEOW nozzle had a much greater destructive effect than that of a conical nozzle. The mass loss caused by HSEOW nozzles increased first with the increase of standoff distance, then decreased rapidly after reaching the maximum value. Moreover, the density of holes and the damage intensity weakened with the increase of radial distance. A dimensionless cavity length of 2 and a dimensionless cavity diameter of 8 was the optimal structure that led to maximum mass loss. These results provide a further understanding of cavitation mechanism which leads to the impact performance of pulsed water jets and optimal working parameters in the field of energy exploitation.

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Optimizing the Structure of the Straight Cone Nozzle and the Parameters of Borehole Hydraulic Mining for Huadian Oil Shale Based on Experimental Research

Cited by 14 publications

References 7 publications

Research on the Bionic Non-Smooth Nozzle for High-Pressure Jet Grouting Based on Computational Fluid Dynamics

Research on the Bionic Non-Smooth Nozzle for High-Pressure Jet Grouting Based on Computational Fluid Dynamics

Experimental research on the performances of water jet devices and proposing the parameters of borehole hydraulic mining for oil shale

Impact Performance of Helmholtz Self-Excited Oscillation Waterjets Used for Underground Mining

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