宁晋石盐田水平连通井堵塞成因分析与认识

Analysis and understanding of the clogging causes of horizontal connected well sets in Ningjin rock salt field

摘要:

经过20多年的发展，定向水平井连通法开采技术虽已日渐成熟，被广泛应用到采卤、采碱等水溶开采领域，但在开采生产过程中经常出现由各种原因引起的井堵现象。宁晋石盐田4对卤井，自连通投产后多次发生堵塞，经过修治后运行一段时间再次出现井堵，频繁井堵致使卤井采卤周期短、经济效益差。针对该区采卤井频繁堵塞情况，结合钻修井过程遇到的各种事故和采卤车间提供的相关数据，经过认真分析总结，主要从盐层蠕变挤破套管、夹石岩粉等杂物沉淀和盐结晶堵塞通道3个方面，阐述了宁晋石盐田的井堵原因及预防措施，可为以后卤井修井及新建卤井提供参考。

Abstract:

Over more than 20 years of development， the well intersection method has been widely used in solution mining， such as salt extraction， soda extraction； however， in the production process of brine extraction well sets， well clogging often occurs due to various causes. Four pairs of brine well sets in Ningjin salt field have been blocked for many times since they were put into production. In view of the frequent blockage， in reference to various accidents encountered in the drilling and workover processes and the relevant data from brine extraction， and with careful analysis and summary， the causes of well clogging and the preventive measures for Ningjinshi salt field are expounded in terms of squeeze-breaking of casing due to salt bed creeping， sedimentation of insolubles and salt crystallization， so as to provide guidance and suggestions for well workover and new brine well construction in the future.