An Explosive Range Model Based on the Gas Composition, Temperature, and Pressure during Air Drilling

Abstract

Air drilling is low cost and effectively improves the penetration rate and causes minimal damage to liquid-sensitive pay zones. However, there is a potential downhole explosion when combustible gas mixed with drilling fluid reaches the combustible condition. In this paper, based on the underground combustion mechanism, an explosive range calculation model is established. This model couples the state equation and the empirical formula method, which considers the inert gas content, pressure, mixed gas component, and temperature. The result shows that increase of the inert gas content narrows the explosive range, while increase of the gas temperature and pressure improves the explosive range. A case in Chongqing, China, is used to validate the explosive range calculation model.

Research on Explosion Characteristics of Prefabricated Cabin type Li-ion Battery Energy Storage

“…Due to the high cost and extremely high risk of explosion experiments in real energy storage scenarios [12,13], in order to maximize the restoration of the working environment of energy storage plants and to study the process and hazards of gas explosions in prefabricated chambers. Use finite element analysis software to establish gas explosion models of single-layer prefabricated cabin energy storage power station and double-layer prefabricated cabin respectively, and select key parameters by changing the initial explosion conditions such as the location of the initiation point, and key parameters (e.g., temperature, maximum pressure value, maximum pressure rise rate, etc.)…”