中速螺杆钻具配钢体PDC钻头现场试验

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

谭春飞 李树盛

Tang Cunfei Li Shusheng

石油大学北京石油工程系

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。

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 2074in Xiaoguai oil field, Karamayi, Xinjiang. The test started from depth 2391. 4m and ended at 2937. 8m with drilling time of 69. 18h and an average ROP of 7. 90m/h, 116% higher than that of roller bit. In interval 2391. 4~2485. 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 2428. 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 2485. 96~2937. 80m, the average ROP increased from 4. 79m/hto 9. 14m/h.

10.3969/j.issn.1000-7393.1998.06.008