渤海油田尾管井高效洗井技术

High Efficiency Washing Technology of Tailpipe Well in Bohai Oilfield

尾管井是渤海油田常见的一种井型,由于套管尺寸变化,刮管洗井需要下入两种钻具和刮管器,底部钻具内径小、摩阻高,洗井排量可能无法满足携带井底水泥块等杂质的最低返速要求,导致洗井不干净,影响后期完井作业。该文从渤海某油田尾管井洗井难点着手,分析总结了影响尾管井洗井效果的因素,创新引进多功能过滤器及分段洗井循环通路转换工具以达到高效洗井的目的,形成了包括尾管井洗井方式优选、洗井管柱优化和高效洗井液的工艺技术体系,现场应用效果良好。

Tailpipe well is a kind of casing procedure commonly used in Bohai Oilfield.Due to the change of casing size,two kinds of drilling tools and scrapers are required for scraping wells.The internal diameter of bottom drilling tool is small,and the frictional resistance is strong,washing displacement may not be able to meet the minimum return rate requirements for carrying impurities such as cement blocks at the bottom of the well,resulting in unclean well cleaning and affecting later completion operations.Starting from the difficulties existing in the tailpipe well washing in an oil field in Bohai,this paper analyzes and summarizes the factors affecting the tailpipe well washing,and innovatively introduces multi-functional filters and loop path conversion tools used in segmented well washing to achieve the goal of efficient well washing.Finally,a process technology system is established that including the optimization of tailpipe well washing method,well washing column and well washing fluid optimization,which achieves good results in field applications.