渤海JZ-X油田气顶窄油环油藏井位优化和挖潜策略

doi:10.7657/XJPG20240112

摘要/Abstract

摘要：

针对气顶底水窄油环油藏易气窜水锥、剩余油分布复杂的生产难题，在渤海矿区逐渐探索出利用水平井开发的井位优化与挖潜策略。基础井网阶段：水平井段垂直构造线穿多层来提高储量动用程度，并匹配智能滑套分采管柱以缓解层间矛盾；基础井网平行于流体界面，部署于油水界面之上1/3油柱高度避气控水。综合调整阶段：通过油藏数值模拟研究，油田开发进入中—后期，剩余油平面上主要富集于井间滞留区，纵向上后期水体能量驱动逐渐发挥主要作用，剩余油主要富集于油层上部。对比井间侧钻、气顶注气和屏障注水方案增油量指标，当前剩余油挖潜策略以井间侧钻与气顶注气为主。井间侧钻通过低产低效井平面侧钻至井间，纵向高部位部署挖潜剩余油，单井净增油量为3.4×10⁴~4.2×10⁴ m³；气顶注气通过采气井转天然气回注，补充气顶能量，气驱水平井上部剩余油，提高原油采收率，预测净增油量为5.2×10⁴ m³。

关键词: 气顶, 底水, 窄油环, 井网部署, 综合调整, 剩余油, 井间侧钻, 注气, 屏障注水

Abstract:

The development of the reservoirs with narrow oil ring, gas cap, and bottom water is often challenged by water coning, gas channeling, and complex remaining oil distribution. This paper discusses the well location optimization and potential tapping strategy for horizontal well development in the Bohai Bay basin. In the basic well pattern arrangement stage, in plane, horizontal wells are arranged perpendicular to the structural lines and penetrating multiple layers for enhancing the recovery of reserves, and the separated-layer production string with intelligent sliding sleeve is equipped to alleviate inter-layer contradiction; vertically, horizontal wells are arranged parallel to the fluid interface and at 1/3 of the oil column height from the water-oil contact for gas channeling prevention and water control. In the comprehensive adjustment stage, according to the numerical reservoir simulation, the remaining oil is enriched in inter-well retention zone in plane in the middle-late development stage, and is vertically enriched in the upper part of the reservoir due to the subsequent dominance of water drive in the late stage. Comparing the oil increment indexes under the schemes of inter-well sidetracking, gas reinjection into the gas cap, and barrier water injection, the former two schemes are preferred for tapping the potential remaining oil. Ineffective and inefficient wells are sidetracked to the zones at high positions between wells, with the expected net oil increment of 3.4×10⁴-4.2×10⁴ m³ per well. For gas reinjection into the gas cap, existing gas production wells are converted for gas reinjection to replenish the energy of the gas cap, so as to displace the remaining oil in the upper part of horizontal wells and enhancing the oil recovery, with the expected net oil increment of 5.2×10⁴ m³ per well.

Key words: gas cap, bottom water, narrow oil ring, well pattern arrangement, comprehensive adjustment, remaining oil, inter-well sidetracking, gas reinjection, barrier water injection

中图分类号:

TE122.1

岳宝林, 孟智强, 房娜, 郑炀, 瞿朝朝, 王双龙. 渤海JZ-X油田气顶窄油环油藏井位优化和挖潜策略[J]. 新疆石油地质, 2024, 45(1): 88-93.

YUE Baolin, MENG Zhiqiang, FANG Na, ZHENG Yang, QU Zhaozhao, WANG Shuanglong. Well Location Optimization and Potential Tapping Strategy for Reservoirs With Narrow Oil Ring and Gas Cap in JZ-X Oilfield, Bohai Bay Basin[J]. Xinjiang Petroleum Geology, 2024, 45(1): 88-93.

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