Calculation of the contribution of single-zone production by ultraviolet spectrum technique： A case study in well QHD32-6-3 field

• Published in: Acta geochimica Vol. 26; no. 1; pp. 80 - 83
• Main Author: 徐耀辉 陈丹 向廷生 文志刚 林青
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Nature B.V 01.03.2007; Department of Geochemistry, Yangtze University, Jingzhou 434023, China; Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education, Jingzhou 434023, China%Department of Geochemistry, Yangtze University, Jingzhou 434023, China%Research Centre of China Offshore Oil Company Ltd., Beijing 100027, China
• Subjects: Biodegradation; Geochemistry; Mathematical models; Monitoring; Reservoirs; Studies; Ultraviolet; Ultraviolet radiation; Wavelengths; Yttrium; 单区生产; 合采井; 紫外光谱技术; ultraviolet spectrum technique; well QHD32-6-3 field; production contribution; commingled producing well; heavy oil reservoir
• ISSN: 1000-9426; 2096-0956; 1993-0364; 2365-7499
• DOI: 10.1007/s11631-007-0080-0

Based on the established mathematic model and graphic interpretation, a new method, which is used to calculate the contribution of single-zone production in a commingled producing well by the ultraviolet spectrum technique, has been established. The standard plate was drawn using the extinction coefficient E of sample oils formulated artificially as y-axis and the wavelength as x-axis. The curve resulting from the UV analysis of sample oils in the commingled well was inserted into the standard plate and compared. The proportion of each single zone in the commingled producing well was identical with the proportion of the curve which is closest to the curve of sample oils formulated artificially. In the well QHD32-6-3 field, taking well A22 for example and using this method, the production contribution of a single zone was calculated. The result showed that the Nm4 zone is a major ＂contributor＂, the proportion of the Nm4 zone is 70%, and that of the Nml zone is 30%. The ultraviolet spectrum technique provided a new reservoir geochemical technique of monitoring production contribution, especially for biodegraded heavy oil, but it has some limitation, just depending on the GC fingerprint technique.