中速螺杆钻具配钢体PDC钻头现场试验

介绍了在新疆克拉玛依小拐油田用5LZ172-7.0中速螺杆钻具配XJ-DBS钢体PDC钻头在G2074井直井段进行快速钻井的现场试验情况。试验从井深2391.4m开始,钻至井深2937.8m.纯钻时间69.18h.平均机械钻速7.90m/h,与牙轮钻头对比,可提高钻速116%。在2391.40~2485.96m井段,进尺94.56m,纯钻时间19.75h,平均机械钻速仅4.79m/h。为了提高钻速,在2419.05~2428.62m井段中,选择了其中3m井段进行了一次转盘加螺杆钻具双驱动方式钻进试验,试验取得了两方面的效果:一是有利于防止动力钻具粘贴于井壁;二是可较大幅度地提高铭速。在井深2485.96~2937.80m井段钻进中,平均机械钻速从4.79m/h提高到9.14m/h。

A FIELD TESTING OF MEDIUM SPEED SCREW DRILL TOOL COMBINED WITH DBS PDC BIT WITH STEEL MATRIX

The field test of 5LZ172 - 7. 0 medium speed positive displacement drills combined with XJ - DBS PDC bit was conducted in the vertical section of well No. G 2 074in Xiaoguai oil field, Karamayi, Xinjiang. The test started from depth 2 391. 4m and ended at 2 937. 8m with drilling time of 69. 18h and an average ROP of 7. 90m/h, 116% higher than that of roller bit. In interval 2 391. 4 ~ 2 485. 96m the footage was 94. 56m with drilling time of 19. 75h and an average ROP of 4. 79m/h only. To increase ROP, 3m section chosen from 419. 05m to 2 428. 62m was tested for drilling with rotary table combined with positive displacement drills. Following two results were gained: it facllitates the prevention of drilling assembly from stlcking in the borehole wall and ROP can be increased significantly.While drilling in interval 2 485. 96 ~ 2 937. 80m, the average ROP increased from 4. 79m/hto 9. 14m/h.