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随着世界石油工业形势日趋严峻,各类高压、超深或致密的油气藏亟待改造。由于施工时井口压力较高,这些储层的压裂措施受到挑战。常规压裂液的密度较低,不能满足施工的需要,通过加重压裂液的方式降低井口施工压力,成功地解决了难题。使用溴化钠作加重剂的高密度压裂液适于149℃以下储层,羧甲基-羟丙基瓜尔胶体系可应用于149℃以上储层,根据不同储层特征适当调整压裂液性能,就能满足高压、深井致密油藏的压裂工艺要求。
As the situation of the world petroleum industry becomes more and more serious, various types of high-pressure, ultra-deep or tight reservoirs are in urgent need of transformation. Fracturing measures in these reservoirs are challenged due to the higher well head pressure during construction. Conventional fracturing fluid density is low, can not meet the needs of construction, by increasing the fracturing fluid to reduce the pressure on the wellhead construction, successfully solved the problem. High-density fracturing fluids using sodium bromide as a weighting agent are suitable for reservoirs below 149 ° C. Carboxymethyl-hydroxypropyl guar systems can be applied to reservoirs above 149 ° C and fractures are appropriately adjusted for different reservoir characteristics Liquid performance, will be able to meet the high pressure, deep well fracturing technology requirements.