鄂尔多斯盆地东缘煤层气钻井实践与认识.pdfVIP

第45 卷 第2 期 煤田地质与勘探 Vol. 45 No.2 2017 年4 月 COAL GEOLOGY EXPLORATION Apr. 2017 文章编号: 1001-1986(2017)02-0157-06 鄂尔多斯盆地东缘煤层气钻井实践与认识 邓钧耀，张 毅，纪 元，宋一男 ( 中联煤层气国家工程研究中心有限责任公司, 北京 100095) : 5 500 ： ：P634.5 ：A DOI: 10.3969/j.issn.1001-1986.2017.02.028 Practice and understanding of coalbed methane drilling in the east edge of Ordos basin DENG Junyao, ZHANG Yi, JI Yuan, SONG Yinan (National Engineering Research Center of China United Coalbed Methane Co., Ltd ., Beijing 100095, China) Abstract: In order to solve the difficult problems such as fracture leakage, well collapse, low mechanical drilling speed and so on in the process of drilling in the eastern margin of the Ordos basin, the paper analyzed the causes and features of these drilling difficulties from the geological conditions, using laboratory analysis and field test to put forward effective measures. To improve the overall development efficiency, cluster well group and well trajec- tory were optimized, drilling fluid system consisting of velvet pouch which maintains the stability of borehole wall and reduces reservoir damage was formulated. Aiming at fracture leakage, the tester of five parameters which can accurately determinate leakage point was developed. On this basis, with blocking slurry as research object and through practice, the blocking technology was formed for different leakage scale and rate. So far, the research re- sults have been successful to guide the drilling of about 500 CBM wells in the area. Keywords: coalbed methane wells; well leakage; drilling assembly; cluster wells; wellbore structure optimization