On some studies about the dynamic mechanisms of carbon monoxide flow and diffusion during high energy gas fracturing

• Published in: Safety science Vol. 50; no. 4; pp. 903 - 908
• Main Authors: Jingyang, Pu, yue, Yang, Chunsheng, Pu, Hongjiang, Zou
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Kidlington Elsevier India Pvt Ltd 01.04.2012; Elsevier
• Subjects: CO flow/diffusion; Earth sciences; Earth, ocean, space; Engineering and environment geology. Geothermics; Engineering geology; Exact sciences and technology; High energy gas fracture; Hydrocarbons; Low permeability; Numerical model; Sedimentary rocks; Far East; Asia; China; CO flow/diffusion; Low permeability; Numerical model; High energy gas fracture; reservoir rocks; diffusion; permeability; carbon monoxide; reservoirs; recovery; sandstone; fracturing; sedimentary rocks; oil and gas fields; numerical models; safety; petroleum; clastic rocks
• ISSN: 0925-7535; 1879-1042
• DOI: 10.1016/j.ssci.2011.08.007

► High energy gas fracturing (HEGF) technique for low permeability reservoirs stimulation. ► Dynamic mechanisms and key affecting factors of CO flow and diffusion during HEGF. ► Guidance for monitoring and preventing CO poisoning accidents during HEGF. High energy gas fracturing (HEGF) technique has been one of central stimulating measures to enhance oil recovery in low permeability reservoirs. But, in recently few years, some serious CO poisoning accidents took place in oilfields here in China. It is very important to reveal the dynamic mechanisms of carbon monoxide flow and diffusion to operating safety during high energy gas fracturing. In this paper, some dynamic mechanisms of carbon monoxide CO flowing inside a oil wellbore and diffusion on the top of the well during high energy gas fracturing were studied with fluid/gas hydrodynamics. The CO flow model within a wellbore and the diffusion model in air were established. The key factors affecting CO flow and diffusion such as wellbore pressure, gas–oil ratio, wind speed, leakage speed, air-permanence were inspected with mathematical simulation. It will be of significance to provide an important guidance for monitoring and preventing CO poisoning accidents during high energy gas fracturing.