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Start Over Author "Wang, Xingzhi" Publisher elsevier bv
58 results on '"Wang, Xingzhi"'

21. Experimental study on gas content of adsorption and desorption in Fuling shale gas field

Author

Aiguo Feng, Chaomo Zhang, Shi Wenrui, Wang Xingzhi, and Zisang Huang

Subjects
Langmuir, Materials science, Analytical chemistry, 02 engineering and technology, 010502 geochemistry & geophysics, Geotechnical Engineering and Engineering Geology, 01 natural sciences, Isothermal process, Methane, chemistry.chemical_compound, Fuel Technology, Adsorption, 020401 chemical engineering, Volume (thermodynamics), chemistry, Isotopes of carbon, Desorption, 0204 chemical engineering, Oil shale, 0105 earth and related environmental sciences
Abstract

Shale gas mainly exists in organic-rich shale in the form of free gas and adsorbed gas. Shale gas content has a direct impact on the productivity and life of the gas well, and is also an important indicator for areal selection and reservoir evaluation. Through the study of gas content experiments of shale gas, we can better guide the exploration and development of shale gas. According to the isothermal adsorption and desorption experiments of Wufeng-Longmaxi Formations in Jiaoshiba block of the Fuling shale gas field in Sichuan basin, China, 7 core samples from isothermal adsorption experiment and 30 core samples from desorption experiment were analyzed. The experimental results show that the isothermal adsorption experiment is an effective way to obtain Langmuir Volume (VL) and Langmuir Pressure (PL). The total gas content obtained from shale desorption experiment in the drilling site is mainly adsorption gas content, and the free gas content is relatively small. The desorption rate is different in different desorption stages, and the samples with higher total organic carbon (TOC) content have faster desorption rate and higher total desorption gas content. The carbon isotope value of methane gradually increases with the increase of desorption time. The results of methane isotope analysis in the desorption experiment are compared with the results of carbon isotope monitoring in the producing process. The findings reveal that after years of development in Jiaoshiba block of the Fuling shale gas field, the methane isotope in gas wells has basically remained unchanged, and the current gas production should be dominated by free gas.

Published
2019

34. Reuse of reverse osmosis concentrate in textile and dyeing industry by combined process of persulfate oxidation and lime-soda softening

Author

Wang Xingzhi, Lei Zheng, and Xiaojun Wang

Subjects
Waste management, Renewable Energy, Sustainability and the Environment, Chemistry, Strategy and Management, Chemical oxygen demand, Biodegradation, engineering.material, Persulfate, Pulp and paper industry, Industrial and Manufacturing Engineering, chemistry.chemical_compound, Sodium sulfate, engineering, Dyeing, Reverse osmosis, Effluent, General Environmental Science, Lime
Abstract

The advanced oxidation technology dominated the disposal of reverse osmosis concentrate in textile and dyeing industry due to its extremely low biodegradability. For resource conservation and sustainable development, the reverse osmosis concentrate was reused in dyeing procedure after being treated properly with combining method of persulfate oxidation and lime-soda softening. Firstly, the refractory organics was oxidized by persulfate thermal activation and the results indicated that the most efficient and economical reaction happened with initial pH = 5.0, 1000 mg/L initial persulfate concentration and 75 °C. In this process, chemical oxygen demand degradation fitted the pseudo-first-order model well and the sodium sulfate concentration increased from 9600 to about 10,350 mg/L. Then, the hardness of reverse osmosis concentrate including Ca 2+ and Mg 2+ hardness was softened efficiently by lime-soda softening technology and appropriate lime and soda concentration was determined to be 150 mg/L and 800 mg/L, respectively. Finally, the effluent was employed as the dyeing water to test the reuse feasibility in dyeing of reactive dyes. Color strength, color difference and color fastness were all used to evaluate the dyeing performance and dyeing results showed that the effluent which was treated properly (COD ≤ 21.5 mg/L, total hardness ≤17.0 mg/L) was available for reuse in reactive dyes dyeing procedure. The study provided a novel method to treat and reuse reverse osmosis concentrate and more importantly, it promoted sodium sulfate concentration and saved its supplementation and dyeing cost in dyeing procedure.

Published
2015

35. Water use for shale gas development in China’s Fuling shale gas field

Author

Aiguo Feng, Meiyu Guo, Rui Liang, Shi Wenrui, Wang Xingzhi, Arshad Raza, and Yuanhui Shi

Subjects
Petroleum engineering, Renewable Energy, Sustainability and the Environment, Shale gas, 020209 energy, Strategy and Management, 05 social sciences, Drilling, 02 engineering and technology, Industrial and Manufacturing Engineering, Hydraulic fracturing, Volume (thermodynamics), 050501 criminology, 0202 electrical engineering, electronic engineering, information engineering, Environmental science, Extraction (military), Stage (hydrology), China, Water use, 0505 law, General Environmental Science
Abstract

A large volume of water is required in shale gas development, especially for large-scale hydraulic fracturing in horizontal wells. This study focuses on 334 shale gas wells in the largest production field Fuling in China. Models are formulated to estimate the water use at each stage of the development process, including pre-drilling preparation, drilling and cementing, fracturing, gas testing, production testing. Domestic water used by employee community of shale gas companies are also fully considered. The results show that the average fracturing water use per well was 34,756.0 m3 in Fuling, which accounted for 98% of the total water use. By the end of 2017, the total fracturing water used in Fuling was 1.09 × 107 m3, and a total of 2.28 × 106 m3 of flowback fluid was achieved with 2.16 × 106 m3 of water reused. In addtion, the domestic water used by the employee community was found to be 2.19 × 106 m3, which was equivalent to the water saved from the flowback fluid. China’s special “development campaign” mode for shale gas extraction is the reason. The results improve the understanding of water use in China’s shale gas development and also provide important implications for water management.

Published
2020

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