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

Abstract

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

CLC Number:

TE122.14

Cheng Liang. 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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References 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

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

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