石油钻采工艺2025，Vol.47Issue(2)：150-160,11.DOI:10.13639/j.odpt.202409006
深埋藏煤岩气水平井防塌防卡钻井液提高钻井效率
Enhancing drilling efficiency in horizontal wells for deep-buried coalbed methane through anti-collapse and anti-sticking drilling fluids
摘要
Abstract
To address the challenges of wellbore instability and difficulties in rock transport during deep coal bed drilling in the Ordos Basin,experiments such as rock component analysis and CT scanning were conducted on potential lithologies that might be encountered.It was found that the clay mineral content in coal gangue was over 28%,mainly composed of illite and montmorillonite.96%of coal rock pores diameters ranged between 0.9 and 13.5 nm,indicating that the coal block has a mesoporous structure.Based on the characteristics of coal rock,a multi-functional drilling fluid system was developed by optimizing the plugging agents,inhibitors,and rheological parameters on the basis of the original brine drilling fluid.Comprehensive evaluations of plugging,inhibition,and rheology were carried out,and the sand loss of the drilling fluid in the sand disc was reduced by 2.6 mL,the rolling recovery rate of coal gangue was increased by 12.70%,and the triaxial compressive strength was increased by 6.52%.The drilling fluid system was applied in two wells on-site,confirming stable coal wellbores,smooth tripping and casing runs.The average wellbore enlargement rate of the third section in the construction wells decreased from 28.48%to 19.01%,and the reverse reaming tripping speed increased from 3.93 m/h to 9.41 m/h.The multi-functional drilling fluid system has solved the problems such as wellbore collapse and sticking in deep coalbed methane wells and provides a solution for other wells facing similar construction issues.关键词
深层煤岩气/水平井/井壁失稳机理/多效钻井液/鄂尔多斯盆地Key words
deep coalbed methane/horizontal well/wellbore instability mechanism/multi-effect drilling fluid/Ordos basin分类
石油、天然气工程引用本文复制引用
侯博,张珩林,胡祖彪,王清臣,孙欢,张勤..深埋藏煤岩气水平井防塌防卡钻井液提高钻井效率[J].石油钻采工艺,2025,47(2):150-160,11.基金项目
中国石油重点科技攻关项目"鄂尔多斯盆地本溪组8#煤岩水平井钻井液技术研究"(编号:CQ2023B-15-2-3) （编号:CQ2023B-15-2-3）
中国石油重点科技攻关项目"鄂尔多斯盆地8#煤岩气水平井井壁稳定及高效携岩技术研究"(编号:CQCJ-2023-01). （编号:CQCJ-2023-01）
