Segmented Multi-Cluster Fracturing Technology for Sidetrack Horizontal Well with Slim Holes in Low Permeability Reservoir
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摘要: 针对低渗透水驱砂岩油藏中的水淹油井利用老井筒开窗侧钻ϕ88.9 mm水平井后，储层无法进行分段压裂来提高单井产能的难点，在研究井网部署和剩余油分布特征的基础上，采用数值模拟方法，研究了不同裂缝密度和压裂段数对油井产能和含水率的影响。室内模拟和现场测试结果表明，裂缝密度为4～6 条/100m、裂缝长度100～120 m时，油井控水增油效果较好；采用“卡封护套”压裂管柱和小直径可溶桥塞分段多簇压裂工艺，可以实现各压裂段之间的有效封隔，并能提高施工效率。小井眼侧钻水平井分段多簇压裂技术的现场施工效果较好，为低渗透油藏进行类似水淹油井恢复单井产能和提高油藏最终采收率提供了技术支持。Abstract: Owing to the failure of improving single well productivity due to the problem that segmented fracturing can’t be effectively conducted in horizontal well with ϕ88.9 mm hole sidetracked by using the old wellbore in water flooding low permeability sandstone reservoir, numerical simulation method is used to simulate the influence of different fracture density and number of fracturing sections on oil well productivity and water cut based on the well pattern arrangement and remaining oil distribution characteristics. The laboratory simulation and field test result show that when the fracture density is 4–6 per 100 m and the fracture length is 100–120 m, the effect of water control and oil increase is better. The effective separation of each fracturing section in horizontal section of slim hole can be fulfilled and the efficiency can be improved by using segmented multi-cluster fracturing technology with soluble bridge plug technology and pony packer pipe strings. Successful practice of segmented multi-cluster fracturing technology in slim hole sidetracking horizontal well provides the technical support for low permeability reservoir to recover single well productivity and to improve ultimate oil recovery.
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Keywords:
- low permeability reservoir /
- sidetracking /
- horizontal well /
- slim hole /
- fracturing /
- segmented multi-cluster
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图 3 不同裂缝密度下的年产量模拟结果
Figure 3. Annual production simulation results under different fracture density
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图 4 不同裂缝段数的水平井水驱开发规律曲线
Figure 4. Water flooding curve of horizontal wells with different fracturing sections
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图 5 不同压裂段数的单井日产油量
Figure 5. Daily oil production of single well with different fracturing sections
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图 6 不同排量条件下的缝内净压力
Figure 6. Net pressure in the fracture under different displacements
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