不动管柱喷射分段酸压技术在超深井的应用

Application of Staged Hydrojet Acid Fracturing without Pulling String to Ultradeep Well

塔里木油田深井超过6000 m,是典型的超深、超高压井,对不动管柱喷射分段酸压技术的应用提出了挑战。超深井喷射分段酸压要达到合理的喷射速度,要求在喷嘴组合、分段酸压设计上进行优化研究。针对塔里木油田哈拉哈塘地区喷射分段酸压的技术难点进行分析,优化出既能达到较高喷射速度,又能在泵压允许条件下完成现场施工的方案设计方法。通过在该地区碳酸盐岩储层中3口井的应用,共完成13段酸压施工作业,充分证明了不动管柱水力喷射分段酸压技术在超深井中的成功性,利用酸压施工曲线、停泵压力分析、邻井对比分析及压后测试等资料,完成对施工资料的后评估分析,达到预期效果,为超深井储层的不动管柱喷射分段酸压设计和施工方案的形成提供了参考。

Deep wells of Tarim Oilfield are typical ultradeep and ultrahigh pressure ones,with more than 6000m deep,which is a challenge in application research of staged hydrojet acid fracturing without pulling string. In order to reach a reasonable jet velocity in ultradeep well,the number of muzzles and their radius are optimized. In view of techonical difficulties in Halahatang area and through analysis and optimization,found is a design method,which can not only obtain rapid jet velocity,but also complete field construction in the conditions allowed by pump pressure. The results obtained from field operation in 13 layers of 3 wells show that application of staged hydrojet acid fracturing without pulling string is successful in these ultradeep wells. The effect of fracturing treatment is proven to be good through acid fracturing curve,pump shutdown pressure analysis,comparative analysis on the adjacent wells and flow test,which has an important guiding significance for design and construction of staged hydrojet acid fracturing without pulling string in ultradeep wells.