井壁稳定技术及其在分支井完井中的应用

Borehole Wall Stabilization Technology Research and Application in Branching Well Completion

通过对增稠剂体系、延迟交联系统、破胶系统的研究 ,确定了井壁稳定液室内配方 ,并对井壁稳定体系进行了性能评价 ,开展了现场应用工艺研究。室内研究证明 :该井壁稳定技术延迟交联温度可控制在 30～ 60℃ ,延迟交联时间可控制 ,耐温可达 1 30℃。该技术可有效地防止井壁坍塌 ,明显降低洗井液用量 ,减少滤失 ,且对地层伤害小。该技术在梁 46-支平 1井上进行了现场应用 ,获得了良好的应用效果和经济效益。

Through analyzing the research of thickening system,retarded crosslinker system and gel breaker system,the lab formula of wellface stabilization was developed.Furthermore the property of wellface stabilizing system was evaluated and used in well production.Lab research showes:this system retarded crosslinking temperature can be adjusted from 30℃ to 60℃,and the time also can be controlled,the highest using temperature is up to 130℃.This technique can effectively prevent borehole collapse,reduce the volume of flush fluid,lessen filtration,and create less damage to formation.Using in Liang 46 l branching horizon well production,the system achieved expecting results and economic benefit.