石油钻采工艺Issue(3)：32-35,4.DOI:10.13639/j.odpt.2015.03.008
松科2井特殊钻进工艺下钻井液技术
Drilling lfuid technique for special drilling technology in SK-2 Well
摘要
Abstract
SK-2 Well, supported by ICDP (International Continental Drilling Program), is the ifrst continental scientiifc exploratory well in the world which penetrates the continental Cretaceous sedimentary formations. In the second spud (2 840 m), the total clay minerals of illite/smectite layer, illite and kaolinite in the formations encountered by the well was up to over 60%, which are easily hydrated, leading to tight hole and collapse. The upper casing in 2nd spud was Ø508 mm, and the lower hole size was Ø215.9 mm. The large difference between the upper and lower holes led to dififculty in lfowback of cuttings. Through mineral identiifcation by XRD diffraction, indoor compounding of drilling lfuid materials and experiment on ifeld core soaking, the low-cost drilling lfuid system was selected which was applicable to coring in large holes of Ø311.2 mm and Ø215.9 mm. In ifeld application, the ratio of dynamic shear force of drilling lfuid was maintained at 0.45 to 0.82 Pa/(mPa·s), the lubricating coefifcient was controlled at 0.11 to 0.14, and sticking coefifcient of iflter cake was 0.12 to 0.15, which effectively addressed the problems of carrying cuttings and reduced the risk of stuck pipe in long open hole. No large collapsing and sloughing occurred downhole during frequent alternating of coring test in large hole, formal designed coring and non-coring drilling jobs and during continuous conditioning of drilling lfuid properties, and the experiments of Ø311.2 mm core drilling in 491.12 m to 510.94 m and Ø215.9 mm core drilling in 1 074.00 m to 1 148.01 m and 1 182.74 m to 1 256.01 m as designed were successfully completed.关键词
松科2井/大陆科钻/特殊钻进工艺/钻井液/裸眼/润滑/携岩/取心Key words
SK-2 Well/continental scientiifc drilling/special drilling technology/drilling lfuid/open hole/lubrication/carrying cutting/coring分类
能源科技引用本文复制引用
郑文龙,乌效鸣,朱永宜,王稳石,张林生,许洁..松科2井特殊钻进工艺下钻井液技术[J].石油钻采工艺,2015,(3):32-35,4.基金项目
国际大陆科学钻探项目“松辽盆地资源与环境深部钻探工程”（编号12120113017600）。 （）
