基于确定性的超深油藏测绘服务,经济有效地管理影响深水油藏再开发的不确定性

Lipeng He, Yongming Gao, B. Chang, Chao Wang, Yongjiang Zhang, Zhongtiang Hu, Fei Wang, Y. Shim
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引用次数: 0

摘要

经过10多年的废弃,M深水油田通过4口800 ~ 1700米长的水平井进行了重新开发。目标层是具有强烈底水驱力的厚孔砂岩储层N,该储层已经密集开采了12年,水平井位于原始油柱的中部(高度15 ~ 42 m)。储层内局部物性较差的互层不足以封堵突水。因此,新的水平段被规划在清洁油藏的上部,与不确定的油水界面(OWC)保持10米以上的距离,并且有足够的距离来抵消钻孔。然而,来自储层性质、流体特征和构造倾角的不确定性极大地复杂化了有效的油圈闭剖面和进一步重要的井位策略。全球成功的案例和建模结果促使决策团队使用超深层油藏测绘服务(UDRMS)来经济有效地优化再开发效率。UDRMS的探测深度(DOI)可达井眼30米,UDRMS可以利用电阻率反演远程探测多个边界,并绘制特定厚储层的属性细节,包括储层顶部、局部互层边界、OWC以及储层内复杂的对比电阻率分层。这些确定和定量的细节可以结合常规岩石物理测井数据,有效地管理相关的不确定性,然后有策略地指导水平段的生产钻井,以获得预期的井性能。成功的再开发结果验证了UDRMS某些产品的有效贡献。在长达1685米的长断面上,所有不确定因素都得到了准确的确定。在以井筒为中心约100米的走廊内,垂直绘制了多达5个边界,以揭示属性、储层顶部和含水率的某些细节。即使在长期停产且剩余油柱高于12 m后,动态OWC仍被确定为倾斜。在实际的下倾构造格架内,平滑的水平轨迹被放置在储层上部,与储层顶部的定量距离和倾斜的OWC,同时避开了局部物性差的区域。即使在结构低处,也采取了特殊的策略,以保证OWC以上至少10米的距离。排井效率满足了再开发要求,对油井性能产生了积极影响。作为改变游戏规则的推手,udrms衍生的某些产品在经济有效地管理影响具有各种复杂性的厚储层开发的不确定性方面显示出其优势。
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Certainty Based on Ultradeep Reservoir Mapping Service to Cost-Effectively Manage the Uncertainties Affecting the Redevelopment of the Deepwater Oil Reservoir
After more than 10-years of abandonment, deepwater oilfield M was redeveloped by using four horizontal wells with 800 to 1700 m long sections. The target was the thick, porous sandstone reservoir N with the strong bottomwater drive, which had been intensively produced for 12 years with the horizontal wells placed at the middle part of the original oil column (15 to 42 m height). The local interbeds with poor properties within the reservoir were proved insufficient to block the water breakthrough. Consequently, the new horizontal sections were planned at the upper section of the clean reservoir with more than 10-m standoff to the uncertain oil/water contact (OWC) and enough distance to offset drilled boreholes. However, uncertainties from the reservoir properties, fluid characterization, and structural dip greatly complicated the effective oil trap profile and the further important well placement strategy. Global successful cases and modeling results pushed the decision team to use an ultradeep reservoir mapping service (UDRMS) to cost-effectively optimize this redevelopment efficiency. With the depth-of-investigation (DOI) up to 30 m from the borehole, UDRMS could use the resistivity inversion to remotely and certainly detect multiple boundaries and map the properties details of this specific thick reservoir, including the reservoir top, local interbeds’ boundaries, OWC, and the intricate layering of contrasting resistivity within the reservoir. These certain and quantitative details could combine the conventional petrophysical logging data to effectively manage related uncertainties and then strategically instruct the productive drilling in the horizontal section for the expected well performance. The successful redevelopment results validated the effective contributions from the UDRMS certain products. Along the long sections up to 1685 m, all uncertain elements were accurately ascertained. Within a corridor of approximately 100 m centered on the wellbore, up to five boundaries were mapped vertically to reveal the certain details of properties, reservoir top, and OWC. The dynamic OWC was identified as still tilted even after a long-term production shutdown and the remaining oil columns were higher than 12 m. Within the actual downdip structural framework, the smooth horizontal trajectories were placed in the upper reservoir with the quantitative distance to reservoir top and tilted OWC, while avoiding the local zones with poor properties. Even at the structural low, the special strategy was executed to guarantee the minimum 10 m standoff above OWC. The well placement efficiency satisfied the redevelopment requirements to positively affect the well performance. As a game-changing enabler, UDRMS-derived certain products displayed their advantages for cost-effectively managing the uncertainties affecting the development of the thick reservoirs with the diverse complexities.
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