海上油田注水井单步法在线酸化技术

Single Step Online Acidizing Technology for Offshore Water Injection Wells

针对常规酸化在海上油田环境、狭小空间作业时存在设备占地面积大、作业时间长、程序复杂、作业环境要求高和协调难度大,且多井次频繁酸化作业给海上油田生产带来严重影响等问题。提出并开展了新型、简易的注水井单步法在线(SSOA)酸化技术的研究,研究中使用高效解堵、抑制二次沉淀能力强的单一酸液InteAcid智能复合酸代替常规酸化三段液体,显著简化配液和注液过程。采用智能注入CCS系统,将酸液按照一定比例注入注水流程管线内在线混配,由注入水携带至储层进行酸化解堵;通过实时监测注入压力和流量,模拟计算表皮系数变化判断酸化效果,进而实时调整施工参数,保证最优酸化效果。新工艺的应用大幅度节约海上油田酸化作业时间、空间、费用和人力,提高酸化施工安全性。80余井次现场应用表明,成功率和有效率高,降压增注效果显著。

To address the problems associated with conventional acidizing on offshore platforms,such as large equipment footprint,long operation time,difficulty in treatment coordination and negative impact on production caused by repetitive acidizing. A novel and simplified acidizing technology for horizontal wells is proposed and studied in this paper. Intelligent integrated acid-Inteacid,which is highly efficient in damage removal and precipitation inhibition,is used to substitute the conventional three stages of acid system and simplify the mixing and injection process. Acid is added into the injection pipeline system at predesigned ratio and conveyed to formation to achieve stimulation under the control of intelligent injection system CCS. Real-time injection pressure and flow rate are monitored to compute the corresponding skin factor and adjust treatment parameters automatically,ensuring the optimum result of acidizing. The application of this novel technology saves the operation time and footprint,maximizes human resource and improves the treatment safety significantly. Over 80 field cases show that the technology is effective in reducing injection pressure and enhancing productivity with high success ratio and efficiency.