基于井眼清洁程度与水力学耦合的环空压耗最小化计算方法  

A Method for Minimizing Annulus Pressure Loss by means of Hole Cleaning and Hydraulics Coupling

作　　者：景帅 肖莉[2] 张好林[2] 王茜 张菲菲 JING Shuai;XIAO Li;ZHANG Haolin;WANG Xi;ZHANG Feifei(Sinopec Information Management Department,Beijing,100728,China;Sinopec Research Institute of Petroleum Engineering,Beijing,100101,China;School of Petroleum Engineering,Yangtze University,Wuhan,Hubei,430100,China)

机构地区：[1]中国石油化工集团有限公司信息化管理部,北京100728 [2]中国石化石油工程技术研究院,北京100101 [3]长江大学石油工程学院,湖北武汉430100

出　　处：《石油钻探技术》2020年第2期56-62,共7页Petroleum Drilling Techniques

基　　金：国家自然科学基金项目“大位移井钻井过程中动态岩屑运移与钻柱受力耦合机理研究”(编号:51874045)资助。

摘　　要：在钻井过程中,岩屑在井眼中堆积形成岩屑床,会引起环空压耗增大。针对井眼清洁不充分造成的环空压耗大的问题,根据质量及动量守恒理论,将岩屑运移与钻井水力学计算相耦合,建立了井眼清洁程度与环空压耗相关的数学模型,并利用全尺寸岩屑运移试验数据进行了模型验证。利用所建模型,分析了排量、井斜角、环空尺寸、机械钻速和钻井液流变参数对环空压耗和井眼清洁程度的影响。结果表明:大位移井和水平井中由于存在岩屑,环空压耗并非随排量增大一直增大,而是存在一个临界值;排量小于临界值时,环空压耗随着排量增大而减小;排量大于临界值时,环空压耗随着排量增大而增大。根据分析结果,建立了基于井眼清洁与水力学耦合的环空压耗最小化计算方法,利用该方法可以优化钻井参数,控制环空压耗,指导钻井设计和钻井施工。Drill cuttings accumulate in the wellbore during drilling and form a cutting bed,which results in the increase of annulus pressure loss.To solve problem of large annular pressure loss from insufficient hole cleaning,a methodology in this study was developed to model the relationships between hole cleaning and annular pressure loss by coupling cuttings transport and annular pressure loss based on mass and momentum conservation.By using the developed model,the influence of parameters such as displacement,wellbore inclination,annulus size,rate of penetration(ROP)and rheological parameters of drilling fluid on annular pressure loss and degree of hole cleanliness were analyzed.The results show that annular pressure loss in extended-reach wells and horizontal wells does not increase with the increase of displacement due to cuttings in the well,but a critical value exists.When the displacement is below the critical value,the annular pressure loss decreases with the increase of displacement.However,pressure loss will increases with the increase of displacement when the displacement exceeds the critical value.Based on this result,a new calculation method is proposed to minimize annulus pressure loss by hole cleaning and annulus hydraulic coupling,which can be used in drilling parameters,control annulus pressure loss optimization and to guide drilling design and operation.

关 键 词：水力学 井眼清洁 环空压耗 岩屑运移 数学模型 

分 类 号：TE22[石油与天然气工程—油气井工程]