Drilling and Completion Technologies of Extended-Reach Wells in the Yangshuiwu Buried Hill Reservoir
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摘要: 为了解决杨税务潜山油气藏大位移井钻井完井中面临的摩阻扭矩大、井眼轨迹控制难度大、泥岩砾岩玄武岩地层钻速低、井底温度高和小间隙固井难度大等技术难点，结合区块地层特点，通过理论分析和模拟计算，优化了井身结构和井眼轨道，优选了井眼轨迹控制方式和钻井液体系，优化了钻井液性能，制定了提速和固井技术措施，形成了华北油田杨税务潜山油气藏大位移井钻井完井关键技术。该技术在T5X井和T101X井进行了现场试验，2口井钻井和完井均安全顺利，与未应用该技术的邻井相比机械钻速提高27.4%，钻井周期缩短19.7%。研究和现场试验结果表明，该技术可以解决华北油田杨税务潜山油气藏大位移井钻井完井中存在的技术难点，满足杨税务潜山油气藏安全高效钻井完井需求。Abstract: Drilling and completion operations in the extended-reach wells of the Yangshuiwu buried hill reservoir are facing technical challenges, such as high friction torque and bottom-hole temperature, difficult well trajectory control and small gaps in cementing, and low ROP in formations of mudstone, conglomerate, and basalt. In light of the formation characteristics, through theoretical analysis and simulation, the casing program and well trajectory were optimized, the well-trajectory control mode and the drilling fluid system were upgraded, and the performance of drilling fluid was improved. In addition, the technical measures for increasing ROP and cementing were introduced. As a result, a system of key drilling and completion technologies of extended-reach wells in the Yangshuiwu buried hill reservoir of the Huabei Oilfield was developed. The field tests of this technical system confirmed safe and smooth drilling and completion in Well T5X and Well T101X. Compared with the adjacent wells without the support of this system, the two test wells had a ROP increase of 27.4% and the drilling cycle decrease of 19.7%. The research and field tests demonstrated that this system can solve the technical difficulties encountered in the drilling and completion of extended-reach wells in the Yangshuiwu buried hill reservoir of the Huabei Oilfield, and can meet the requirements for safe and efficient drilling and completion in this area.
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Keywords:
- buried hill reservoir /
- extended-reach well /
- drilling /
- well completion /
- high temperature /
- well trajectory /
- Yangshuiwu Block
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图 3 扭力冲击器的结构
1.中间轴；2.动力锤；3.启动器；4.涡轮系统；5.过滤系统；6.下轴承；7.上轴承
Figure 3. Structural diagram of torsion impactor
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图 4 井深5 425.00 m处顶替效率模拟曲线
Figure 4. Simulation curve of displacement efficiency at a depth of 5 425.00 m
表 1 试验井和邻井钻井技术指标对比
Table 1 Comparison of drilling technical indexes between test wells and adjacent wells
井号 完钻井深/m 垂深/m 造斜点井深/m 水平位移/m 最大井斜角/（°） 钻井周期/d 机械钻速/（m·h–1） T5X 6 207.00 5 410.67 1 405.05 2 166.81 29.52 176.96 6.63 T101X 5 960.00 5 527.96 1 520.62 2 042.91 36.00 122.42 8.14 T2X 5 930.00 5 600.46 3 200.00 1 170.35 37.01 186.38 5.73 
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