Hydraulic Shaping Technology of Deformed Casing after Fracturing in Horizontal Shale Oil Wells
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摘要:
页岩油藏需要大规模体积压裂后才能获得工业油流，但大液量、大排量的体积压裂易导致套管变形、缩径，套变段以下井段无法下入压裂工具和投产工具，而常规液压整形技术存在修复能力差、滚珠易落井和有效期短等不足，难以满足工艺要求。为解决该问题，设计加工了扩张式胀管器等系列液压胀套工具，经过室内试验，完善了胀套工艺，形成了页岩油水平井压裂后变形套管液压整形技术。沧东凹陷页岩油水平井现场试验表明，该技术有效期长，可以解决页岩油开发中的套管变形问题，满足投产时连续管钻除多级压裂桥塞（扫塞）恢复底层井段能量的需要。
Abstract:Shale oil reservoirs need large-scale volume fracturing to obtain industrial oil flow. However, volume fracturing with a large fluid amount and large displacement is easy to cause casing deformation and borehole shrinkage, and it is hard to run fracturing and production tools into the well section below casing deformation. Conventional hydraulic shaping technologies have shortcomings such as poor repair ability, easy ball drop, and short validity period and thus fail to meet the technological requirements. In view of these problems, a series of hydraulic casing expansion tools were designed, such as expandable casing swage. Through laboratory tests, the casing expansion technology was perfected, and the hydraulic shaping technology of the deformed casing after fracturing in horizontal shale oil wells was formed. Field tests in Cangdong Sag show that the technology has a long validity period and can successfully solve the casing deformation problem in shale oil development, and it can restore the energy of the bottom well section by coiled tubing drilling out the multi-stage fracturing bridge plug (sweeping plug) when put into production.
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Keywords:
- shale oil /
- casing deformation /
- casing shaping /
- hydraulic casing expansion /
- volume fracturing /
- horizontal well /
- Cangdong Sag
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表 1 页岩油水平井液压整形技术与常规技术对比
Table 1 Comparison of hydraulic shaping technology and conventional technology in horizontal shale oil wells
技术 工艺可靠性 卡钻风险 修复效果 常规液压整形技术 滚珠及碎裂残片落井；工具串刚性大，易蹩断 风险高 变形套管短期内回弹 页岩油水平井液压整形技术 扩张牙片强度高、受力均匀；工具串挠度大，胀头自动找正 风险低 塑性大硬度高，有效期长 
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表 2 GD1701H井测40臂解释结果
Table 2 40-arm logging interpretation results of Well GD1701H
序号 起始深度/m 终止深度/m 长度/m 正常半径/mm 最小半径/mm 最大半径/mm 测井解释 1 4 081 4 083 2 59.31 39.09 65.98 变形 2 4 084 4 087 3 59.31 43.71 63.60 变形
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