Test of Constant Torque Converter while Drilling in Well TH121125
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摘要: 塔河油田12区深部硬地层在钻井过程中,常因PDC钻头黏滑振动造成机械钻速较慢.为解决该问题,在TH121125井1 204.00~4 845.00 m井段试验应用了随钻恒扭器.结果表明:试验井段的扭矩波动小,比较平稳;与邻井相同井段相比,机械钻速提高了20.56%~59.65%,钻井周期缩短了21.08%~41.39%;试验井段的最大井斜角仅1.07°,最大井径扩大率仅6.42%,与邻井相比井身质量得到明显提高.试验结果表明,应用随钻恒扭器可以有效消除PDC钻头的黏滑振动,保护钻头及钻柱,有利于防斜打快,提高钻井速度.Abstract: To solve drilling problems of slow penetration owing to "slimy" vibration of a PDC bit in the deep and hard formation of Block-12 in Tahe Oilfield,a test of a constant torque converter was carried out in the well section of 1 204.00-4 845.00 m of Well TH121125.Test results showed that torque fluctuation was minor and relatively stable.Compared to offset wells in the same well section,the penetration rate was improved by 20.56%-59.65%,and drilling cycle was shortened by 21.08%-41.39%.In addition,the maximum inclination angle was only 1.07°,and the hole enlargement rate was within 6.42%.Wellbore quality was clearly improved.This indicated that constant torque converter while drilling could effectively eliminate the "slimy" vibration of PDC bit,and protect drill bits and strings so as to make good deviation control and improve drilling speed.
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