A Study on Distribution of Remaining Oil in the High Water-cut Stage of Delta Front Sand Body

doi:10.11885/j.issn.1674-5086.2020.07.25.01

Abstract

Abstract: SZ Oilfield is a typical delta frontal sediment oilfield in Bohai Sea, it has entered high water-cut period. The residual oil is generally dispersed with accumulation in certain areas. The difficulty of tapping potential is increasing. It is necessary to research the distribution of residual oil in high water-cut period. The study shows: after entering the high water-cut period, the internal relationship between the delta front sedimentary sand body and the injection-production well pattern has a significant controlling effect on the formation and distribution of residual oil. After discussion on the injection-production connectivity between single sand bodies in the study area, according to the situation of injection and production of single sand body in the well, the macroscopic residual oil distribution pattern in the study area is summarized as residual oil caused by imperfect injection-production, and residual oil partially affected by injection-production. The residual oil caused by imperfect injection-production includes unconnected residual oil, connected but obstructed residual oil and residual oil formed by the unobstructed sand body but without oil and water migration; the residual oil that has been partially affected includes local unobstructed residual oil and unobstructed residual oil. According to the distribution scale of the remaining oil level and the longitudinal distribution mode, the practice of irregular directional tapping of a combination of directional wells, horizontal wells and subdivision of layer series under the regular well network of offshore oilfields was carried out. The in-situ application is good and effective. The results of this study have guiding significance for efficient development and adjustment of the delta front sedimentary oilfield in the high water cut period.

Key words: high water-cut period, delta front, residual oil, directional well, horizontal well

CLC Number:

TE122

ZHANG Rui, LIU Zongbin, LIAO Xinwu, WANG Gongchang, TIAN Bo. A Study on Distribution of Remaining Oil in the High Water-cut Stage of Delta Front Sand Body[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(2): 1-18.

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