Drilling cuttings, the primary byproduct from the exploration and mining of shale gas, are potentially hazardous wastes that are associated with the serious depletion of land resources and environmental safety problems. In this work, the distribution of polycyclic aromatic hydrocarbons (PAHs) in oil-based residues of shale gas drilling cuttings was studied. Furthermore, a column leaching test was carried out to investigate the leaching behaviour of PAHs. The results showed that (1) the concentrations of 4-ring PAHs were highest among the PAH concentrations detected from the oil-based residues, and the concentration of PAHs decreased with increasing particle size of the residues. (2) The PAH concentration in leachates from all the tested residues differed during the leaching process, and the cumulative amount of each leached PAH accounted for 1.50-3.20% of the total PAHs. (3) The first-order diffusion model (FRDM) was the most applicable model for describing the leaching characteristics of the PAHs, and the leaching rate was initially controlled by surface wash-off and then by diffusion.
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http://dx.doi.org/10.1016/j.chemosphere.2021.132711 | DOI Listing |
J Air Waste Manag Assoc
January 2025
Chongqing Yuanda Air Pollution Control Franchise Co Ltd. Technology Branch, Chongqing, China.
As a significant player in the global shale gas extraction industry, China has achieved a leading position in shale gas production on a worldwide scale. However, China is also facing the challenge of managing a considerable quantity of oil-based drill cuttings (OBDCs), which are classified as hazardous waste. Without appropriate treatment methods, these materials could cause significant environmental contamination.
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December 2024
College of Mechanical Engineering, Baoji University of Arts and Sciences, Baoji 721016, China.
The surface roughness of hole machining greatly influences the mechanical properties of parts, such as early fatigue failure and corrosion resistance. The boring and trepanning association (BTA) deep hole drilling with axial vibration assistance is a compound machining process of the tool cutting and the guide block extrusion. At the same time, the surface of the hole wall is also ironed by the axial large amplitude and low-frequency vibration of the guide block.
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December 2024
Changqing Down Hole Technology Company, CCDC, Xi'an 710000, China.
Wellbore instability caused by hydration during the development of shale gas reservoirs poses significant challenges to drilling engineering. In this study, a novel and environmentally friendly shale inhibitor, TIL-NH, was synthesized via free radical polymerization using 1-vinylimidazole and N-(2-bromoethyl)-1,3-propanediamine dihydrobromide as the main raw materials. The molecular structure of TIL-NH was characterized by infrared spectroscopy and nuclear magnetic resonance.
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December 2024
Department of Rail Vehicles and Transport, Faculty of Mechanical Engineering, Cracow University of Technology, 31-155 Cracow, Poland.
The aviation industry is still looking for effective manufacturing methods. Currently, the challenge is still the machining of shapes in thin-walled materials. This work focuses on the analysis of the influence of these parameters on deformations during the drilling process of holes in the adapters of aircraft engine body accessories.
View Article and Find Full Text PDFACS Omega
December 2024
Shenmu Ningtiaota Mining Company, Shaanxi Coal and Chemical Industry Group, Shenmu, Shaanxi 719300, China.
Given that conducting controllable shock wave tests in actual rock formations underground in coal mines affects coal mine production with the parameters required for equipment design and incurs significant costs, a series of ground tests were conducted separately. First, the impact of energy storage on rock breaking efficiency was analyzed. Then, physical simulation experiments were conducted on the differential efficiency of controllable shock waves on high-strength cement, sandstone, granite, solid granite, and limestone.
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