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吐哈油田三塘湖盆地火山岩地层具有岩石成分复杂、储层基质物性差、天然裂缝发育、非均质强、地应力梯度高、敏感性强、自然产能低等特点,这给压裂增产改造增加了不少难度。针对其地质复杂性,在室内研究评价的基础上,形成了针对该区块储层压裂增产改造技术方案,包括:①低伤害的乳化压裂液体系;②小粒径陶粒多段支撑剂段塞、30～50目和20～40目陶粒组合加入方式;③测试压裂G函数分析选择合理排量;④高比例液氮助排等。研究成果在三塘湖盆地卡拉岗组探井应用10井次,施工成功率为90%,有效率为100%。结果表明,乳化压裂液与三塘湖盆地强水敏火山岩具有良好的适应性,防膨率为70%～80%,伤害率为20%～30%,压后压裂液排液效率较水基压裂液提高约30.0%,单井压后最高产量达25.12m3/d,达到了低伤害压裂的要求。
The volcanic rocks in the Santanghu basin of Tuha Oilfield are characterized by complex rock composition, poor physical properties of the reservoir matrix, natural fractures, strong heterogeneity, high in-situ stress gradient, high sensitivity and low natural productivity, Increased a lot of difficulty. According to its geological complexity, based on the research and evaluation in the interior, a technical scheme for the stimulation of reservoir fracturing stimulation has been formed, including: ① low damage emulsified fracturing fluid system; ② small particle size ceramsite multi-stage proppants Slug, 30 ~ 50 mesh and 20 ~ 40 mesh ceramsite combination of ways; ③ test the selection of a reasonable displacement of the fracturing G function; ④ high proportion of liquid nitrogen and so on. Research Achievements Drilling wells in the Karakang Formation of the Santanghu Basin use 10 wells with a construction success rate of 90% and an effective rate of 100%. The results show that the emulsified fracturing fluid has good adaptability to the strong water-sensitive volcanic rocks in Santanghu Basin, with the anti-swelling rate of 70% -80% and the damage rate of 20% -30% Water-based fracturing fluid increased by about 30.0%, the highest single-well pressure after the production of 25.12m3 / d, reached a low injury fracturing requirements.