三塘湖盆地马56区块致密油重复压裂实践

摘要

针对三塘湖盆地马56块致密油衰竭式开发引起地层能量下降、单井产量递减较快、采出程度较低的问题.以提高单井最终采收率为目标,开展了致密油重复压裂技术研究.通过地质研究与评价,形成了优选重复压裂“甜点”层段,补充地层能量与暂堵转向压裂工艺相结合的技术思路.在马56区块进行了6井次重复压裂现场应用,压裂后稳定日产油是压裂前的2.24倍,取得了明显的增产效果.该技术组合对致密油藏重复压裂具有重要借鉴意义.%During the depletion-type development of tight oil reservoir in Ma 56 Block,the Santanghu Basin,the producing energy drops,single-well production rate declines fast and the degree of reserves recovery is lower.To deal with these problems,tight oil reservoir refracturing technology was investigated with improving single-well ultimate recovery factor as the target.Based on geological study and evaluation,the "sweet spot" interval for refracturing was selected out,and the technological idea which combines the producing energy complementation with the temporary plugging and diversion fracturing was proposed.Refracturing was carried out on site by 6 well times in Ma 56 Block.And the stimulation effect is remarkable,and the stable daily oil production after the fracturing is 2.24 times that before the fracturing.This technological combination is of instructive significance to the refracturing of tight of oil reservoirs.