Effect of nozzle pressure ratio on pulsation frequency of air jets used in hole drilling

Liu, Yong; Wang, Chenchen; Wei, Jianping; Chen, Changjiang

doi:10.1016/j.petrol.2020.107399

Cited by 14 publications

(2 citation statements)

References 27 publications

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“…Jet technology has the advantages of concentrated energy and high efficiency of crushing coal and rock, which is considered as a new technology of slotting in coal seam. , The high-pressure water jet slotting technique aims to prevent coal and gas outburst disasters by forming a fissure network to improve coal permeability. Through the cutting action of the water jet, multiple slots are excavated on the inner wall of the borehole to form a larger pressure relief area in the hole by destroying the “bottleneck effect” around the borehole and increasing the effective influence radius of the borehole.…”

Section: Current Technology For Cbm Exploitationmentioning

confidence: 99%

Current Status and Effective Suggestions for Efficient Exploitation of Coalbed Methane in China: A Review

et al. 2021

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The commercial production of coalbed methane (CBM) in China has made significant achievements. To further improve the production of CBM and realize its development, it is necessary to establish a unique, high-efficiency CBM production method that considers the characteristics of coal reservoirs in China. This paper presents the current status of China's CBM exploitation over the past 15 years from three aspects: reservoir characteristics, production mode, and exploitation technology. The achievements, in terms of exploration and development of CBM resources in China, were summarized. The CBM reservoirs in China are characterized by high coal rank, low permeability, high gas content, and low reservoir pressure gradient. Strategic measures for coal and CBM co-mining were proposed creatively as "Huainan", "Jincheng", and "Songzao" modes. CBM production enhancement measures have achieved significant innovations and breakthroughs in drilling and completion technologies and reservoir reconstruction, effectively reducing development costs and increasing single well production. Finally, based on existing basic research, this study proposes efficient CBM exploitation technologies suitable for the characteristics of CBM reservoirs in China. In particular, the uniform permeability enhancement measures of hydraulic grid slotting and fracturing have the advantages of safety, high efficiency, economy, feasibility, and broad application prospects under complex mining conditions. It is of great strategic significance to improve the CBM recovery rate and optimize China's energy structure.

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Section: Current Technology For Cbm Exploitationmentioning

confidence: 99%

Current Status and Effective Suggestions for Efficient Exploitation of Coalbed Methane in China: A Review

et al. 2021

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“…It was found that both jet angle and sediment hardness can affect the crushing efficiency. Liu et al [26][27][28][29] proposed a high-pressure abrasive gas jet technology for coal breakage and systematically investigated the stress wave effect, the wear mechanism of abrasive air jet erosion, and the effects of nozzle pressure ratios on the pulsation frequency of air jets. Ranjith et al [30] studied the effect of mass flow on the abrasive acceleration of gas jets.…”

Section: Introductionmentioning

confidence: 99%

Gas Jet Coal-Breaking Behavior: An Elliptical Crushing Theoretical Model

Wang

Yang

et al. 2021

Geofluids

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Coalbed methane (CBM) is a source of clean energy and has been recovered in past decades all over the world. Gas dynamic disaster is the primary disaster in outburst coal, and methane drainage plays a key role in eliminating this danger. As an efficient technology, a gas jet is widely used in CBM development and methane drainage. In this work, the full impinging process of coal and rock fracturing by a supersonic gas jet was studied. To understand how jet parameters affect coal and rock fracturing results, an elliptical crushing theoretical model was proposed. In addition, a laboratory experiment was designed to examine the proposed model, and four key parameters affecting the fracturing results were studied. The results show that different from the monotonic variation of theoretical values, there is a turning point in the variation of experimental values under some parameters. Considering the influence of the depth and radius of the erosion pit, the rock-breaking effect is better when the nozzle size is 2.75 Ma. The optimal target distance is 30 mm, and the impact pressure of a gas jet should be continuously increased in order to achieve certain rock-breaking effects under the impact of the jet.

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Full cycle numerical simulation during the pulsed laser cladding process considering the interaction between laser and powder

Sun,

Li,

Han

2024

Int J Adv Manuf Technol

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Effect of nozzle pressure ratio on pulsation frequency of air jets used in hole drilling

Cited by 14 publications

References 27 publications

Current Status and Effective Suggestions for Efficient Exploitation of Coalbed Methane in China: A Review

Current Status and Effective Suggestions for Efficient Exploitation of Coalbed Methane in China: A Review

Gas Jet Coal-Breaking Behavior: An Elliptical Crushing Theoretical Model

Full cycle numerical simulation during the pulsed laser cladding process considering the interaction between laser and powder

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