空气携岩能力数值模拟分析  

EFFECT OF INCLINATION,ECCENTRICITY,ROD ROTATIONAL SPEED ON SOLIDS-CARRYING CAPABILITY DURING AIR DRILLING

作　　者：朱红钧[1] 林元华[1] 明传中[2] 赵思军 牟鹤林[2] 

机构地区：[1]石油管力学和环境行为重点实验室.西南石油大学 [2]塔里木油田分公司工程技术部 [3]川庆钻探工程公司川东钻探公司

出　　处：《钻采工艺》2010年第6期29-30,35,共3页Drilling & Production Technology

基　　金："新世纪优秀人才支持计划"(NCET-08-0907);四川省杰出青年学科带头人培养基金(06ZQ026-028);中国石油天然气集团公司应用基础研究项目"非API标准油气井管材及管柱安全性与优化设计技术研究"(2008A-3005)资助

摘　　要：井斜、环空偏心率、钻杆转速等对井筒压降与空气携岩能力有着显著影响,但因其变化范围大,变化组次多,将影响程度定量化还比较困难,而这些恰是指导安全钻进的主要依据。文章基于计算流体动力学方法建立了空气钻井环空内气固两相流动的数学模型,通过数值模拟得出了不同井斜角、不同环空偏心距、不同钻杆转速条件下环空内流场与气固相体积浓度分布,分析了井斜、偏心、钻杆转速对空气携岩能力的影响,为空气钻井安全钻进与井眼净化评价提供依据。Borehole inclination,annulus eccentricity and drill pipe rotational speed strongly affect pressure loss and air solids-carrying capability in the annulus.Due to the complex factors,accurately calculating the pressure loss and the solids-carrying capability are difficult,while these factors are the important basis for safe drilling.Mathematical model of gas-solids flow properties was set up based on the computation fluid dynamics theory.The distributions of flow properties and volumetric cuttings concentration with variable inclination,eccentricity and rotational speed were got by the simulation.Then impacts of the solids-carrying capability were analyzed with variable factors.Some references could be provided to guide safe drilling and appraise borehole cleaning in practice.

关 键 词：井斜 偏心 钻杆转速 环空 岩屑体积分数 

分 类 号：TE21[石油与天然气工程—油气井工程]