The Use of 4D & Dynamic Synthesis in Brown Field Development: A Case Study of S-P3 Infill Well Maturation, Preparation and Drilling

G. Uwerikowe, O. Oshewa, P. Wantong, M. Usman
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Abstract

Based on the Field Development Plan (FDP), AKPO Reservoir ST was developed with two crestal producers (ST-P2 and ST-P1) and two water injectors at the periphery (ST-W2 on the eastern flank and ST-W1 on the western flank). However, the results of a time lapse seismic monitor (4D M-2) in addition to dynamic simulation showed that the attic oil of S-Reservoir would be bypassed at the end of Field life. The time lapse seismic monitor (4D M-2) results also showed that the main producer in the S-Reservoir; ST-P2 was risking early water breakthrough from the ST-W2 water injector at the toe. Hence, the need for an infill well to mitigate these identified risks. This paper presents the maturation & drilling strategy, well results and the production performance of the first infill well of the AKPO Field. The infill maturation strategy involved the update of the geological model with recent well/ 4D seismic information, evaluation of the present static uncertainties on in-place volumes, history matching of the dynamic model in line with current field behaviour and the evaluation of the incremental production and economic value of the infill well. S-P3 trajectory was designed as a sub-horizontal drain to target and produce the attic oil in the S-Reservoir up-dip of producer ST-P2. It was completed across two fault blocks to ensure drainage of the southern panel as fault behaviour remains one of the main uncertainty. The well trajectory was placed as far up-dip as possible, with its toe set higher than the shallowest completion of ST-P2 in the S-reservoir. The final well result for S-P3, drilled in Q4 2016, was outstanding, thanks to excellent integration of seismic, geological and dynamic data. The main results included: Optimal well placement, as a result of real time adjustments of the well trajectory aided by reservoir navigation toolsMore attic oil found as a result of shallower top of S-ReservoirIncremental production of 15 kboepd over 2 years and an incremental reserves of ∼10 Mboe.
四维动态综合技术在棕地开发中的应用——以S-P3井成熟、准备和钻井为例
根据油田开发计划(FDP), AKPO ST油藏进行了开发,包括两个顶部生产装置(ST- p2和ST- p1)和两个注水装置(ST- w2位于东翼,ST- w1位于西翼)。然而,时移地震监测(4D M-2)和动态模拟的结果表明,s油藏的上部油将在油田寿命结束时被绕过。时移地震监测(4D M-2)结果也表明s -储层为主要产油层;ST-P2面临着从ST-W2注水器中提前注水的风险。因此,需要通过一口井来降低这些风险。介绍了AKPO油田首口井的成熟钻井策略、井效及生产动态。气藏成熟策略包括利用最新的井/四维地震信息更新地质模型、评估现有的原位体积静态不确定性、根据当前油田动态对动态模型进行历史匹配,以及评估气藏的增量产量和经济价值。S-P3轨迹被设计为亚水平漏井,以瞄准并开采ST-P2生产者s -油藏上倾的上部油。由于断层行为仍然是主要的不确定因素之一,因此完成了两个断块,以确保南部板块的排水。井眼轨迹尽可能向上倾斜,其趾部设置高于s -油藏ST-P2最浅的完井。S-P3井于2016年第四季度完成钻井作业,由于整合了地震、地质和动态数据,最终的钻井结果非常出色。主要成果包括:在油藏导航工具的帮助下,实时调整井眼轨迹,实现了最佳的井位布置;s -油藏顶部较浅,发现了更多的储层油;2年内产量增加了15万桶/天,储量增加了10万桶/天。
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