普光气田整体固井工艺技术

Overall Cementing Technology for Puguang Gas Field

普光气田是国内首个投入开发的海相气田,具有高温高压高含硫的特点,同时存在地层复杂、气窜、漏失、长裸眼小间隙、大斜度和水平井以及存在盐膏层等几乎所有固井中可遇到的技术难题,固井难度国内罕见。通过分析储层特性和单井井况,优选了防腐防气窜水泥浆体系,应用分段压稳设计模型进行水泥浆柱结构设计,同时采取高抗挤低密度水泥浆技术、正注反挤工艺、水平井提高顶替效率等措施,形成了普光气田高含硫气井固井综合技术。现场应用表明,固井质量得到了保证,满足了普光气田开发的要求。

As the first marine gas field in China,Puguang gas field with characteristics of high temperature and pressure and high sulfur content, has almost all the technical cementing problems such as complicated formation, gas migration, circulation loss, long slim openhole and high angle, horizontal wells, and salt formation. Through analysis of reservoir characteristics and single well condition,an anti-corrosion and anti-gas channeling slurry sys- tem was optimized. Stage-cementing model was used to design slurry column to balance the pore pressure. At the same time, by using the low-density slurry with high collapse strength, positive injection and reverse squeezing technology, and measures to improve displacement efficiency, a comprehensive cementing technology in Puguang gas field which contains high H2 S content was developed. Field application shows that cementing qualities are satisfactory and meet the requirement of developing Puguang gas field.