Geochemical Alteration of Waterflooded Oils and the Controlling Factors(PDF)
《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]
- Issue:
- 2017年第06期
- Page:
- 807-825
- Research Field:
- 基础地质与矿产地质
- Publishing date:
Info
- Title:
- Geochemical Alteration of Waterflooded Oils and the Controlling Factors
- Author(s):
- CHANG Xiang-chun; SUN Ting-ting; WANG Yue; WANG Tao; CUI Jing
- 1. College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China; 2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, Shandong, China; 3. Luming Branch, Shengli Oilfield Company, SINOPEC, Dongying 257001, Shandong, China
- Keywords:
- reservoir geochemistry; waterflooded oil; water washing; biodegradation; reservoir wettability; geo-chromatography; compositional alteration; controlling factor
- PACS:
- P618.13;TE122.1
- DOI:
- -
- Abstract:
- Waterflooding is one of the most commonly used methods for enhancing oil recovery. Due to the long-term contact of injected water, crude oil and reservoir rock during the water flooding oil process, the interaction of oil-water-rock may cause oil compositional modification, which becomes the research focus of reservoir geochemistry. Combined with the results of the laboratory modeling and case study, the dynamic variation of oil property, bulk composition, saturate biomarkers, aromatic biomarkers, carbon isotopes of whole oil and oil fractions were summarized. The affecting mechanism and altering yields of water washing, biodegradation, geo-chromatography, different reservoir characteristics and wettability on the oil compositions during the process of water flooding were comprehensively reviewed. Allowing for the complex relation between those controlling factors and the waterflooded oil flow, three critical issues, such as distinguishing the superimposed effects of biodegradation and water washing in shallow waterflooded oil reservoir, defining the key points for the inversion of reservoir rock wettability, depicting the microscopic process of water flooding and changing regularity of oil composition were proposed to be preferentially resolved, coupled with three techniques including the characterization of oil composition by comprehensive two-dimensional gas chromatography/time-of-flight mass spectrometer, the quantitation of the in-situ reservoir wettability by nuclear magnetic resonance, the evaluation of the altering effect by the association of physical simulation experiment and dynamic production surveillance.
Last Update: 2017-12-15