深井超深井短轻尾管短路故障测试方法与现场应用  

Short Circuit Fault Test Method and Field Application of Short and Light Liners in Deep and Ultra-Deep Wells

作　　者：刘国祥[1] 赵德利[1] 李振 孔博[1] LIU Guoxiang;ZHAO Deli;LI Zhen;KONG Bo(Sinopec Research Institute of Petroleum Engineering,Beijing,102206,China)

机构地区：[1]中国石化石油工程技术研究院,北京102206

出　　处：《石油钻探技术》2021年第5期70-74,共5页Petroleum Drilling Techniques

摘　　要：为了精准测试深井超深井短轻尾管是否发生短路,在尾管短路常规测试方法的基础上,结合实际施工作业条件,提出了变密度浆体循环压力变化曲线测试方法,分析了变密度循环测试原理、控制过程,研究了可操作的测试流程与技术关键点。变密度浆体循环压力对井下循环通道变化具有较高的敏感性,反映在压力曲线上会有不同的压力变化,通过对比现场实测压力曲线与理论压力曲线,可准确判断井下管柱短路情况。现场应用表明,该测试方法具有抗干扰因素强、测试结果精准度高和现场操作简便的优点,能够准确判断尾管管柱是否发生短路。变密度浆体循环压力变化曲线测试方法解决了深井超深井短轻尾管短路测试难的问题,具有较好的现场推广应用价值。To accurately test the short circuit of short and light liners in deep and ultra-deep wells,a test method for the circulating pressure curves of variable density slurry was proposed after analyzing conventional test methods for liner short circuits and considering actual construction conditions.The principle and control processes of variable density cyclic tests,operable test programs,and key technical points were studied.The circulating pressure of variable density slurry was highly sensitive to the changes in downhole circulation channels,shown in pressure curves as variations.The comparison between the measured and theoretical pressure curves can reveal the short circuit situation of downhole strings.Field application results prove the test method has the characteristics of strong anti-interference capability,accurate measurement results,and simple operation,which can correctly identify the short circuit of liner strings.The test method for the circulating pressure curves of variable density slurry has overcome the difficulty in testing the short and light liner short circuits in deep and ultra-deep wells,which is worthy of wide application.

关 键 词：尾管 短路 迟到时间 循环压力 变密度浆体 线容积 

分 类 号：TE256.4[石油与天然气工程—油气井工程]