An Ordered Clustering Based Segmentation Method for Water Control Completion with AICD in Horizontal Wells
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摘要:
目前水平井分段完井时主要依靠现场经验进行分段，尚未形成完善的分段方法，制约了控水完井技术的应用。为此，基于有序聚类方法，结合水平井筒流入剖面，以延长无水采油期和提高累计产油量为目标，建立了水平井AICD控水完井分段方法。模拟分析某非均质底水油藏发现：在水平井配产2 000 m3/d的情况下，与均匀分段和按测井渗透率分布非均匀分段2种AICD完井方案相比，该分段方法对应的无水采油期分别为延长了0.86 d和缩短了1.76 d，累计产油量分别提高了0.20×104 m3和0.11×104 m3；与射孔完井相比，无水采油期延长了17.88 d，累计产油量提高了4.48×104 m3。渤海油田某底水油藏现场试验结果表明，该分段方法能够解决水平井底水锥进问题，提高累计产油量。该分段方法进一步丰富了水平井控水完井分段理论，为水平井AICD控水完井技术的推广应用提供了支撑。
Abstract:Currently, the application of segregated completion technology in horizontal wells mainly relies on field experience, and an ideal segregated method has not yet been developed, which limits the application of water controls in completion. To extend the water-free production period and increase the cumulative oil production, a segregated completion method which involved water control in horizontal wells has been propose. This method is based on ordered clustering and combination with the distribution of inflow profile in horizontal wells. By means of an analysis using simulations, it is found that for a heterogeneous bottom-water reservoir with an assumed flow rate of 2000 m3/d in the horizontal wells that water free production period can be extended by 0.86 days, 1.76 days less compared with AICD completion programs. This calculation was based on uniform segregated method and the segregated method from logging permeability. After implementing the changes, the cumulative oil production increased by 0.20×104 m3 and 0.11×104 m3, respectively. Compared with perforation completion, the water free production period extended by 17.88 days and cumulative oil production increased by 4.48×104 m3. The field test results of a bottom water reservoir in the Bohai Oilfield show that the segregated method can effectively solve the problem of water coning in horizontal wells and improve cumulative oil production. This method further enriches the segmentation theory of water control completion in horizontal wells, and provides theoretical support in the application of water control completion using AICD in horizontal wells.
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图 1 无因次损失函数随分段数的变化趋势
Figure 1. Trend of dimensionless loss function with segmentation number
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图 2 基于有序聚类的水平井分段流程
Figure 2. Ordered clustering-based segmentation flowchart for horizontal wells
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图 4 水平井射孔完井对应的流入剖面
Figure 4. Inflow profile of horizontal well for perforation completion
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图 5 不同完井分段方案对应的无水采油期
Figure 5. Water free production period for different completion programs
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图 6 不同完井分段方案对应的累计产油量
Figure 6. Cumulative oil production for different completion programs
表 1 最小分类损失函数
Table 1 Minimum loss function for classification
节点
序号不同分段数对应的最小分类损失函数 2 3 4 5 6 7 3 0.125(3) 4 0.145(3) 0.020(3) 5 0.145(3) 0.020(3) 0.005(4) 6 5.613(3) 0.145(6) 0.020(6) 0.005(6) 7 8.277(3) 0.165(6) 0.040(6) 0.020(7) 0.005(7) 8 9.600(3) 0.225(6) 0.100(6) 0.040(7) 0.020(8) 0.005(8) 
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表 2 某底水油藏的储层参数和井筒参数
Table 2 Reservoir and wellbore parameters of a certain bottom-water reservoir
参数 数值 参数 数值 油藏长度/m 2 400 地层水体积系数 1.02 油藏宽度/m 1 050 原油压缩系数/（10–7MPa–1） 3 油藏厚度/m 15 水压缩系数/（10–7MPa–1） 3 油藏顶部深度/m 2 000 岩石压缩系数/（10–7MPa–1） 4 油水界面深度/m 2 030 束缚水饱和度 0.38 油藏原始压力/MPa 21 残余油饱和度 0.24 水平渗透率/mD 1 100～
3 540井深/m 2 009 孔隙度，% 25 水平井长度/m 2 000 原油密度/（kg·m–3） 870 避水高度/m 10 地层水密度/（kg·m–3） 1 000 水平井筒直径/mm 200 原油黏度/（mPa·s） 7.0 套管外径/mm 139.7 地层水黏度/（mPa·s） 0.7 套管内径/mm 121.36 原油体积系数 1.20 套管粗糙度/mm 0.1
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