Study on the Control Factors and Potential-tapping Strategies for the Remaining Oil of SZ Oilfield in the Bohai Sea

doi:10.11885/j.issn.1674-5086.2017.10.31.02

Abstract

Abstract: The recovery efficiency of SZ Oilfield in the Bohai Sea has greatly improved since the first infilling adjustment. However, with the oilfield transitioning to the high-water-content stage, the distribution of the remaining oil has become increasingly complicated and it has become more difficult to make further adjustments and realize the untapped potential; sustainable development of the oilfield necessitates new technical means and exploitation strategies. To cope with these challenges, a detailed description of the vertical and in-plane contact relationship of homogeneous sand bodies was carried out on the basis of the delta facies reservoir architecture theory, by comprehensively utilizing coring, seismic, and logging data. With this approach, the role of reservoir architecture in controlling the movement of oil and water was analyzed. The results showed that during the high-water-content stage, inter-stratum and inter-zone interference, intercalated beds, and joints between plane-architecture units were critical to controlling the remaining oil. To further improve the oil field development efficiency, three architecture unit-based strategies are proposed for tapping the potential of inter-stratum and intra-stratum horizontal wells and infilling densely spaced horizontal wells. A set of technologies was developed for tapping the potential of the delta facies oil reserves remaining after a comprehensive adjustment is made to the oilfield. The strategies and technologies were then applied, achieving good results.

Key words: high water-cut stage, reservoir architecture, remaining oil, control factors, potential-tapping strategy

CLC Number:

TE122

TIAN Bo, LI Yunpeng, JIA Xiaofei, ZHANG Xuefang, ZHANG Rui. Study on the Control Factors and Potential-tapping Strategies for the Remaining Oil of SZ Oilfield in the Bohai Sea[J]. 西南石油大学学报(自然科学版), 2018, 40(5): 28-36.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2017.10.31.02

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