氮气泡沫压裂液体系的研究与应用

氮气泡沫压裂是70年代以来研究发展起来的一项新的压裂工艺技术,它特别适用于低压、低渗和水敏性地层的压裂改造。对氮气泡沫压裂液的基本配方和流变性能进行了室内评价研究。研究了泡沫质量、表面活性剂类型、浓度、剪切速率、温度、压力等因素对泡沫压裂液流变性能的影响。在实验基础上提出了适宜辽河油田的泡沫压裂液配方体系,采用该压裂液在辽河油田先后成功地对8口井实施了氮气泡沫压裂施工,施工成功率100%,累积增产原油1.24×10⁴ t,取得了显著效果。

RESEARCH AND APPLICATION OF NITROGEN FOAM FRACTURING LIQUID

Nitrogen foam fracturing, a new fracturing technique be-ginning in 1970s, is especially suitable for the fracturing opera-tion of low-pressure, low permeable andwater sensitive forma-tion. The basic formulation and rheological properties of nitro-gen foam fracturing liquid have been studied in laboratory. The influence of some factors such as foam quality, concentration and type of surfactants, shearing rate, temperature and pressure on rheological properties of foam fracturing liquid has been stud-ied. Based on the laboratory tests, the foam fracturing liquid formulation suitable for Liaohe Oilfield has been put forward.Eight wells have been successfully fractured with the fracturingliquid, and the accumulative increasing oil is 1.24×104t, the successful ratio of treatment is 100%.