摘要
豫西地区岩层倾角大,岩石软硬互层较多,特别是金斗山砂岩、平顶山砂岩,可钻性级别高,裂隙发育,地层破碎,掉块、漏水,钻孔易斜,造成孔内事故增多甚至钻孔报废,钻探施工效率低。针对该区地层特点,采用SJ75绳索取心钻具进行钻探施工,首先,对其配套设备进行了改进,将4135G型柴油机皮带轮由Φ350 mm加大至Φ396mm,以提高立轴的转速;在立根箱里面垫上了一层厚30 mm左右的木板,木板上面又垫了一层厚15 mm的橡胶皮,以有效地保护丝扣。其次,在钻进过程中,先后对平底、齿形、复合片钻头进行试验。试验表明,齿形钻头是比较适合该地区绳索取心钻进的金刚石钻头。再次,结合绳索也取心对钻井液的要求,应用非分散低固相、无固相和堵漏低固相钻井液对不同地层进行钻进。各种措施的采取,很好地解决了钻进中遇到的问题,减少了孔内事故,提高了钻孔质量。
The strata in western Henan have characteristics of large dip angle, frequent alternating soft and hard beds, especially the Jindoushan sandstone and Pingdingshan sandstone have higher drillability level with developed fissures, fragmentation of rock, easy to off the blocks, current loss and deviation, thus caused increasing of drilling accidents even to discard, low drilling efficiency. In allu-sion to strata characteristics in the area, the SJ75 wire-line coring drilling tools have been used. Firstly, improved associated facilities, enlarged 4135G diesel engine belt pulley fromΦ350mm toΦ396mm to increase vertical shaft rotation rate;a layer of wood board about 30mm thick filled up on the pipe rack, than a 15mm thick layer of rubber on wood board to protect screw thread effectively. Secondly, during the drilling process, has tested the flat bottom, jagged and PDC bits successively. The test has shown that the jagged diamond bit is rather propitious to wire-line coring drilling in the area. Thirdly, in consideration of wire-line coring drilling requirements on drill-ing fluid, have used non-dispersed low solid, solid free and leak stopping low solid drilling fluids on different strata. The adoptions of various measures have solved problems in drilling effectively, reduced downhole accidents, improved drilling quality.
出处
《中国煤炭地质》
2015年第5期54-57,共4页
Coal Geology of China
关键词
复杂地层
绳索取心
设备改进
钻头试验
钻井液
防斜
complicated strata
wire-line coring
facility improvement
bit test
drilling fluid
deviation controlling
