不同钻井方式下的井底岩石可钻性研究  

Investigation of Rock Drillability under Different Penetrating Method

作　　者：杨谋[1] 孟英峰[1] 李皋[1] 李永杰[1] 王延民[1,2] 

机构地区：[1]油气藏地质及开发工程国家重点实验室(西南石油大学),四川成都610500 [2]中国石油塔里木油田公司博士后科研工作站,新疆库尔勒841000

出　　处：《石油钻探技术》2010年第2期19-22,共4页Petroleum Drilling Techniques

基　　金：国家重大专项"大型油气田及煤层气开发"子项目"气体钻井关键工艺理论及钻柱力学研究"(编号:2008ZX05022-005-004HZ)资助

摘　　要：岩石可钻性指标是钻井工程中的一项基本数据,当前计算岩石可钻性的方法很少考虑井底围压对岩石可钻性的影响。首先,论述了围压对井底岩石强度的影响,分析了不同渗透性条件下求取井底围压的差异;其次,建立了围压下的岩石可钻性计算模型,并对液体测井数据进行了校正以获取气体钻井的岩石力学参数;最后,应用MathCAD软件编程分析了不同钻井方式下的可钻性级值。分析表明,气体钻井与常规钻井方式相比,泥岩地层可钻性级值能减小1-2个级别,而砂岩地层可钻性级值可减小2-4个级别。理论分析与试验分析结果吻合度高,有助于钻前预测机械钻速。It is essential to obtain rock drillability in drilling.Currently there are a lot of methods for calculating rock drillability,while most of them did not consider the impact of confining pressure on rock drillability.This paper discusses the impact of confining pressure on rock strength,and analyses the difference of obtaining confining pressure under various rock permeability.A drillability model is established considering confining pressure.Fluid logging data are corrected to obtain rock mechanics parameters for gas drilling.Finally,rock drillability grade indexes are analyzed using MathCAD software.Analysis indicates that the drillability level of shale can be decreased by 1 to 2 grade in gas drilling well compared with liquid drilling,and sand stone can be reduced 2 to 4 grades.The theoretical analysis agrees with experimental data,and can be used to predict the rate of penetration.

关 键 词：岩石可钻性 渗透性 孔隙压力 封闭压力 气体钻井 

分 类 号：TE21[石油与天然气工程—油气井工程]