基于管窜影响的碳酸盐岩油藏产水特征图版——以伊拉克Ahdeb油田Rumaila复杂多层碳酸盐岩油藏为例

摘要/Abstract

摘要：

为快速有效地解决伊拉克Ahdeb油田Rumaila复杂多层碳酸盐岩油藏因套管外窜流、高渗通道水窜及分层合采等因素造成的出水类型复杂、水侵机理不明等问题,建立了能表征纯水层、油水过渡带和纯油层精细分布的Rumaila复杂多层碳酸盐岩地质油藏模型。在此基础上,采用实际典型产水曲线标定数模曲线、无因次时间替代实际时间的方式得到不同套管外窜流情况下(水泥环与储层间的第二界面破损位置位于纯水层、油水过渡带和纯油层)的套管外窜流&底水锥进、底水锥进&后期套管外窜流、套管外窜流和射孔段部分位于油水过渡带&套管外窜流等十二种典型产水特征图版,以此对油藏出水类型和水侵机理进行判明与分析。结果表明,产水特征图版能够高效辨析油藏出水类型和水侵机理,有效降低了井下PLT、SWFL测试等工作频率,也为直井后续治水措施的制定提供了可靠依据。

关键词: 伊拉克, 艾哈代布油田, Rumaila油藏, 产水特征图版, 治水措施

Abstract:

In order to guarantee the fast and professional solution about types of water production and mechanism of water invasion in the Rumaila complex multilayer carbonate reservoir of Ahdeb oilfield with casing channeling, high permeability zone and situation of commingled production, a fine reservoir model which can characterize the pure aquifer zone, oil-water transition zone and pure oil zone was built. On this basis, combined with analysis of water invasion velocity in each reservoir, the various simulation curves would be calibrated by the actual typical production curves to obtain the different typical water control diagnostic plots including casing channeling with bottom aquifer coning, bottom aquifer coning with later casing channeling, single casing channeling and the section of perforation located in the oil-water transition zone with later casing channeling（including different position of casing channeling: pure aquifer zone, oil-water transition zone and pure oil zone） with dimensionless time, which would be used to distinguish and analyze the reservoir water-producing type and rules. The results showed that the water control diagnostic plots could accurately obtain the water production type and rules, decrease the downhole PLT, SWFL and other tests, and provide reliable basis for the stabilizing oil and controlling water of vertical wells.

Key words: Iraq, Ahdeb oilfield, Rumaila reservoir, typical water production curve, control water measures

中图分类号:

TE122.14

程亮. 基于管窜影响的碳酸盐岩油藏产水特征图版——以伊拉克Ahdeb油田Rumaila复杂多层碳酸盐岩油藏为例[J]. 油气藏评价与开发, 2018, 8(5): 29-36.

Liang Cheng. Water control diagnostic plots of carbonate reservoir based on the influence of casing channeling: A case of Rumaila complex multilayered carbonate reservoir of Ahdeb oilfield in Iraq[J]. Reservoir Evaluation and Development, 2018, 8(5): 29-36.

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参考文献 19

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层位	钻遇油层厚度/m	射开油层厚度/m	N_pr	D_pr	储层弹性能	含水率,%	采出程度,%	水体倍数	水侵系数/ （MMbbl/（MPa·月））	端点流度比	K_v/K_h
Ru2a	229.60	6.00	4.26	1.89	一般	40.6	0.24	7.09	0.021	0.60	0.1
Ru2b-U	321.00	118.50	4.20	1.92	一般	33.9	2.88	7.88	0.016	0.60	0.1
Ru2b-L1	175.80	96.00	8.86	0.92	一般	49.5	5.16	9.82	0.009	0.60	0.1
Ru2b-L2&Ru3	220.00	53.00	12.89	0.63	充足	33.1	3.99	37.31	0.088	0.58	0.7

井类	依据产水特征曲线判定出水类型	PLT/SWFL/机械找窜等测试实际管窜位置	依据产水特征曲线判定管窜程度	依据产水特征曲线判定锥进程度	现阶段控水稳油对策
A1	管窜及底水锥进（纯水层）	纯水层	严重	正常锥进	①封窜管窜层段 ②上返补孔 ③优化工作制度,减小生产压差
A5	管窜（纯水层）	纯水层	严重	正常锥进
A6	管窜（纯水层、官破损空间变化）	纯水层至油水过渡带一部分	严重	正常锥进
A7	管窜（油水过渡带）	未测试	严重	快速锥进
A4	射孔段部分位于油水过渡带及后期管窜	纯油层	较严重	正常锥进
A2	管窜及底水锥进（纯油层）	纯油层	严重	正常锥进	①优化工作制度,减小生产压差 ②管窜位置下方建立人工隔板 ③生产后期封窜并上返补孔
A8	管窜（纯油层）	未测试	严重	正常锥进
A3	底水锥进及后期管窜	纯油层	不严重	正常锥进

井名	原射孔层	出水类型	封窜原因	封窜方式	封窜后采取措施	封窜后生产效果
ADR-1	Ru2b-U&Ru2b-L1	管窜（纯水层）	PLT测试发现生产层段下部出现流体温差,封窜前含水率65 %	先后采用一次定点挤入、四次笼统挤入的方式挤入2.69 m³水泥浆实施封窜	上返至Ru1层	日均产550 bbl/d,无水采油期150 d
ADR-2	Ru2b-U至Ru2b_L2&Ru3	管窜及底水锥进（纯水层）	机械找窜和PLT测试发现Ru2b-L1层与Ru2b-L2&Ru3层窜通,封窜前含水率达到58 %	先后采用一次定点挤入、两次笼统挤入的方式挤入2.16 m³实施封窜	上返至Ru1层	日均产350 bbl/d,无水采油期182 d
ADR-3	Ru2b-L2	管窜及底水锥进（油水过渡带）	RBT显示固井质量差,开井后迅速见水,关井憋压15 MPa降至12.9 MPa	采用一次定点挤入的方式挤入0.6 m³水泥浆实施封窜	优化工作制度	日均产680 bbl/d,无水采油期320 d