三角洲前缘砂体高含水期剩余油分布研究

doi:10.11885/j.issn.1674-5086.2020.07.25.01

摘要/Abstract

摘要： 渤海SZ油田发育典型三角洲前缘沉积，目前已进入高含水期，剩余油分布更趋零散，挖潜难度日益增大，有必要开展高含水期剩余油分布研究。研究表明，高含水期三角洲前缘砂体内部结构与注采井网的配置关系对剩余油的形成与分布具有直接的控制作用。在讨论研究区井间单砂体的注采连通性的基础上，按井间单砂体注采完善状况将研究区宏观剩余油分布模式类型总结为注采不完善未动用剩余油和注采完善已动用剩余油，其中，未动用剩余油包括井间不连通类、连而不通类以及通而不畅类，已动用剩余油包括局部通畅类和注采完善类两种类型。依据剩余油平面分布规模以及纵向分布模式，开展了海上油田规则井网下定向井、水平井以及细分层系等多种手段相结合的不规则定向挖潜实践，矿场应用效果良好。该研究结果对高含水期三角洲前缘砂体高效开发调整具有指导意义。

关键词: 高含水期, 三角洲前缘, 剩余油, 定向井, 水平井

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

中图分类号:

TE122

张瑞, 刘宗宾, 廖新武, 王公昌, 田博. 三角洲前缘砂体高含水期剩余油分布研究[J]. 西南石油大学学报(自然科学版), 2022, 44(2): 1-18.

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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