Journal of Energy Science and Technology is an international, peer-reviewed open access journal dedicated to advancing research the field of energy science and technology. The journal provides a rapid publication process to ensure wide dissemination of high-quality articles to scientists, professionals, and interested individuals worldwide. Our goal is to serve as an efficient, reliable, and trusted platform for scholars and readers, publishing cutting-edge research in the field.
Abstract: Due to the unique nano pores and Nadasi permeability of shale gas wells, high strength and large displacement fracture matrix fracturing with long sections and clusters, frequent pressure channeling interference, variable pressure and production mode and other factors, it is difficult to accurately predict its single well EUR. According to the three different periods of post fracturing, testing and decline of shale gas wells, the three-level calculation workflow of single well EUR is established by constructing estimation model and optimizing prediction method. In the post fracturing stage, the multiple regression relationship is used for preliminary estimation (The average calculation error is 5.5%), in the test stage, the linear relationship of test production is used for prediction (The correlation coefficient is 0.88), and in the decline stage, the calculation accuracy is mainly improved by analytical simulation method. Based on the dynamic and static data of Weiyuan block, EUR prediction is made for 140 shale gas wells. The results show that the average EUR of single well is 81 million cubic meter, 122 million cubic meter for class I well, 78 million cubic meter for class II well and 46 million cubic meter for class III well. This workflow and method can be used as a guide and reference for single well EUR calculation of other shale gas or unconventional gas.Abstract: Due to the unique nano pores and Nadasi permeability of shale gas wells, high strength and large displacement fracture matrix fracturing with long sections and clusters, frequent pressure channeling interference, variable pressure and production mode and other factors, it is difficult to accurately predict its single well EUR. According to the thre...Learn More
Abstract: The density of hydrogen is extremely low, and during fuel supply, hydrogen gas will rapidly expand from the hydrogen injection port into the intake duct, leading to air supply blockage. To eliminate intake blockage in hydrogen fueled internal combustion engines and improve their overall performance. This article investigates the effects of different hydrogen injection rates (hydrogen injection pressure and nozzle diameter) on the performance of hydrogen internal combustion engines at low speeds, based on an improved quantum genetic algorithm (IQGA) and a combination weighting method. The results show that compared with the standard quantum genetic algorithm (QGA), IQGA has faster convergence speed and higher convergence accuracy. By using IQGA to optimize the nozzle diameter and hydrogen injection pressure, it can be concluded that when 3mm and 1.5bar are selected for hydrogen internal combustion engines, intake blockage is less likely to occur; Changing the nozzle diameter and hydrogen injection pressure separately has a significant impact on the flow state of the mixed gas in the inlet duct, and the nozzle diameter has a more significant effect on the inlet blockage than the hydrogen injection pressure. The coupling effect of the two is reflected in the impact of the hydrogen injection mass flow rate on the flow state of the mixed gas in the inlet duct. There is a strict linear relationship between the hydrogen injection mass flow rate and the maximum return flow rate. When the hydrogen injection mass flow rate is not higher than 2.29kg/h, before the inlet valve is closed, No intake back flow occurs; through the combination weighting method, it can be concluded that the comprehensive performance of hydrogen internal combustion engines is the best when the nozzle diameter is 5mm and the hydrogen injection pressure is 3bar.Abstract: The density of hydrogen is extremely low, and during fuel supply, hydrogen gas will rapidly expand from the hydrogen injection port into the intake duct, leading to air supply blockage. To eliminate intake blockage in hydrogen fueled internal combustion engines and improve their overall performance. This article investigates the effects of differen...Learn More
Abstract: Since the outbreak of novel coronavirus pneumonia in 2019, the demand for disposable medical masks has been enormous and the environmental pollution has become increasingly serious. The current disposal methods for masks cannot effectively solve their environmental pollution problem, and how to dispose of discarded masks has become a hot topic. In recent years, lost circulation has become a major "bottleneck" problem in drilling deep and unconventional oil and gas horizontal wells, attracting widespread attention from scholars both domestically and internationally. This work is based on the properties of polypropylene material to perform simple physical treatment on discarded medical masks, and develops a deep-water drilling fluid formula suitable for ocean drilling. Preliminary performance studies have been conducted on it. The results show that discarded medical masks have little impact on the conventional performance of the drilling fluid, but significantly improve the plugging performance of the drilling fluid, especially by increasing the pressure bearing capacity of the drilling fluid to 8MPa. This work has proven the feasibility of using discarded medical masks in oil field leak stoppage, promoting the rational resource utilization and sustainable development of medical mask waste, reducing energy and environmental pressure, and helping China achieve the goal of "carbon neutrality". At the same time, it has some inspiration for the research and development of drilling fluid leak stoppage technology.Abstract: Since the outbreak of novel coronavirus pneumonia in 2019, the demand for disposable medical masks has been enormous and the environmental pollution has become increasingly serious. The current disposal methods for masks cannot effectively solve their environmental pollution problem, and how to dispose of discarded masks has become a hot topic. In ...Learn More
