Research and application of nano synergis in Sulige tight gas reservoir
The Sulige tight sandstone gas reservoir belongs to a low porosity and low perme-ability reservoir,with small pore throats,high displacement fracturing,and strong hy-drophilicity.It is difficult for conventional fracturing fluid to flow back,causing serious water lock damage,and greatly affecting gas well production.A nano synergistic agent with small particle size,strong performance,low damage,and easy portability was prepared based on the geological characteristics of this type of gas reservoir.The mechanism of improving per-meability,reducing interfacial tension,and changing wettability by entering the deep part of micro and nano pores enhances the development efficiency of gas reservoirs.During the on-site testing process,further optimization of the fracturing method is carried out,firstly by in-jecting sand into the annulus to reduce the frictional resistance of the fracturing fluid and in-crease the injection rate of the fracturing fluid.Secondly,in the pre fluid stage and the early stage of sand carrying fluid,nano synergistic agents are added differentially to reduce water lock in deep reservoirs,improve the flow channels in low pore throat areas such as micro fractures in far wells,and enhance the productivity contribution rate in far well areas.The results show that the nano enhanced fracturing technology reduces the liquid nitrogen injec-tion ratio,improves the flowback effect,shortens the well construction cycle,and increases the single well production.The successful application of this technology has positive guid-ance and reference significance for hydraulic fracturing of tight gas reservoirs,and has broad application prospects.
tight gas reservoirsSulige gasfieldnano synergismhydraulic fracturing
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