Quality Index of Water for Recycling Flowback Fluid of Guar Gum Fracturing Fluid in Shengli Oilfield
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摘要:
通过对胜利油田多口压裂井返排液水质指标的分析，确定了瓜胶压裂液返排液的水质特点。在此基础上，分别考察了pH、还原性离子、硬度、矿化度、含油量和悬浮物含量对瓜胶压裂液性能的影响程度，确定了压裂液返排液回收利用需要控制的水质指标：pH值为6.5～7.5，Fe2+含量不超过5 mg/L，S2-含量不超过2 mg/L，Ca2+不超过500 mg/L，矿化度低于100 000 mg/L，悬浮物不超过300 mg/L，悬浮物和原油含量对瓜胶压裂液的基液黏度和耐温耐剪切性能无影响，说明悬浮物和原油与瓜胶和交联剂都不发生反应。因此，在压裂返排液回用过程中，可适当放宽对原油和悬浮物含量的要求。为压裂液返排液的回收利用提供了依据。
Abstract:The quality of water from the backflow fluid of guar gum fracturing fluids is determined through analyses of the backflow fluid from multiple wells. The effects of pH, reducing ions, hardness, salinity, oil contents and contents suspended matters on the performance of the guar gum fracturing fluids were studied based on the aforesaid analyses. To recycle the backflow fluid, the water quality should be controlled as follows:pH between 6.5 and 7.5, Fe2+ less than 5 mg/L, S2+ less than 2 mg/L, Ca2+ less than 500 mg/L, salinity less than 100,000 mg/L, and suspended matter less than 300 mg/L. These data provide a basis for the recycling of the backflow fluids of fracturing fluids.
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Key words:
- Flowback fluid of fracturing fluid /
- Guar gum /
- Recycle /
- Water quality
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