Key technologies for improving deep shale gas horizontal drilling ROP in Luzhou
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摘要: 四川盆地泸州区块深层页岩气储层具有地层温度和压力高的特点，致使旋转导向仪器故障率高，四开平均钻井周期长；同时受井眼轨道“低造斜点+高造斜率”设计和长水平段轨迹频繁调整的影响，起下钻和下套管摩阻大。针对上述难题，通过现场试验，形成了降钻井液密度控压钻井、地面降温系统、旋转下套管等关键技术。现场应用表明：钻井液密度从2.20 g/cm3降至1.82 g/cm3，旋转导向仪器故障率从50%下降至30%；四开井段平均机械钻速从8 m/h提高到11.44 m/h，提高了43%；平均钻井周期从55.2 d降低到27.1 d，降幅51%；钻井提速提效显著。本文试验形成的关键技术对泸州深层页岩气水平井钻井工程提速提效具有良好的推广和借鉴意义。Abstract: Deep shale gas reservoir in Luzhou Block is featured of high formation temperature and pressure， leading to a high failure rate of 50% for the rotary-steering drilling tools and long average drilling time up to 50 days. Also， due to the wellbore trajectory design of “low kick-off point+high buildup rate” and the frequent adjustment of the long horizontal section trajectory， the frictional resistance during tripping of drilling strings and placement of casing was large. To address the above problems， several key technologies have been developed， including low-density-mud-based managed pressure drilling， the surface cooling system， and rotary casing placement. Field application showed that the density of drilling fluid was reduced from 2.20g/cm3 to 1.82g/cm3， the average ROP of the forth well section was 11.44m/h with an increase of 43%， the average drilling period was 27.1 days with a reduction of 51%， and the drilling speed and efficiency were significantly improved. The key technologies have good promotion and reference significance for improving the speed and efficiency of deep shale gas drilling projects in Luzhou.
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Key words:
- deep shale gas /
- MPD /
- rotary-steering drilling /
- surface cooling system /
- rotary casing running /
- Luzhou Block /
- Sichuan Basin
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