气体钻水平井的携岩CFD数值模拟研究  

CFD NUMERICAL SIMULATION RESEARCH ON CUTTINGS-CARRIED CAPABILITY IN GAS HOR- IZONTAL DRILLING

作　　者：孟英峰[1] 练章华[1] 梁红[2] 李永杰[2] 吴仕荣[3] 伍贤柱[4] 陈刚[3] 肖新宇[4] 

机构地区：[1]"油气藏地质及开发工程国家"重点实验室.西南石油学院 [2]西南石油学院 [3]中国石油西南油气田分公司 [4]四川石油管理局

出　　处：《天然气工业》2005年第7期50-52,共3页Natural Gas Industry

基　　金：本文系油气藏地质及开发工程国家重点实验室基金项目(编号:PLN0405)

摘　　要：文章研究了气体钻水平井的携岩问题,发现水平井气体携岩的规律与垂直井有本质不同。目前国际上流行的斜井、水平井气体钻井流动计算与井下真实情况相比有很大差别,从而导致计算得到的携岩气体需求量过于偏小,难以保证井下正常携岩、清岩。用CFD软件对水平井段钻柱躺在下井壁,并造成偏心环空内流体的问题进行了大量不同工况下的流场分析,其研究结果对改善环空流场、确定合理的输气量参数、提高流体的携岩能力等,提供了理论依据。Through investigating the cuttings-carried capability in gas horizontal drilling, it was found that, the cuttings-carried law in gas horizontal drilling is far different from that in gas vertical drilling. The gas drilling flow calculation, prevailing internationally at the time, of slant hole and horizontal hole was greatly distinctive from the actual situation, thus making the required cuttings-carried gas volume calculated being too much small to normally carry over the cuttings and clean out the bottom hole. A large number of flow field analyses of the eccentric annulus caused the horizontal interval drilling string laying on the lower borehole wall were carried out at different operating modes by use of CFD software. The study result has provided a theoretic ba sis for improving annulus flow field, determining reasonable gas input rate parameters and raising cuttings-carried capability of drilling fluid, etc.

关 键 词：数值模拟研究 CFD软件 流动计算 气体钻井 水平井段 流场分析 偏心环空 研究结果 携岩能力 垂直井 需求量 内流体 输气量 井下 斜井 钻柱 

分 类 号：TE249[石油与天然气工程—油气井工程] X145[环境科学与工程—环境科学]