天然气工业2025，Vol.45Issue(4)：98-108,11.DOI:10.3787/j.issn.1000-0976.2025.04.008
砂岩地层可钻性预测方法:微观结构与矿物组分模型
Sandstone drillability prediction method:Microstructure and mineral composition model
摘要
Abstract
Accurate evaluation of formation rock drillability provides a reliable basis for the optimization of drilling technologies and tools.Due to the great difficulty and cost of downhole coring,however,only cores from key intervals can be collected in most cases,so it is difficult to meet the demands for full-hole rock drillability evaluation.With the advancement of drilling technologies towards ultra-deep formations,there is an increasing demand for continuous rock drillability evaluation.Taking sandstone as an example,this paper extracts mineral particle contours from thin-section images.Then,microstructural quantitative indicators are obtained,and the relationship between sandstone microstructure and drillability is investigated.Finally,a drillability prediction model based on mineral compositions and microstructures is established through regression analysis,enabling drillability prediction of sandstone based on its microstructural and mineral compositional characteristics.The following results are obtained.First,sandstone drillability increases with quartz content but decreases with plagioclase content,and shows no significant correlation with the compaction degree,surface roughness,size uniformity and interlocking index of mineral particles.Second,the larger the size of mineral particles inside the sandstone and the lower the roundness,the weaker the corresponding drillability.Third,the prediction accuracy of rock drillability based on quartz and plagioclase content exceeds 0.68,whereas that based on microstructures and mineral compositions is higher than 0.83.In conclusion,this method can predict sandstone drillability comprehensively based on mineral content and microstructural characteristics of drilling cuttings,exhibiting the advantages of high speed,high efficiency and low cost,which saves the drillability determination costs and has important application prospect and value in the field of petroleum engineering.关键词
砂岩/可钻性/微观结构/岩屑/地层/石英/斜长石/预测模型Key words
Sandstone/Drillability/Microstructure/Rock cuttings/Formation/Quartz/Plagioclase/Prediction model分类
石油、天然气工程引用本文复制引用
石祥超,陈帅,肖文强,焦烨,王兆巍..砂岩地层可钻性预测方法:微观结构与矿物组分模型[J].天然气工业,2025,45(4):98-108,11.基金项目
国家自然科学基金面上项目"基于岩石细观结构的可钻性分级体系及智能识别方法"(编号:52474009)、中国石油—西南石油大学创新联合体项目"深井复杂地层钻井方式优选及提速工艺技术"(编号:2020CX040103). （编号:52474009）
