The traditional cellulose fracturing fluid is very difficult to blend,with poor temperature resistance performance,gel breaking is not completely,serious damage to the stratum,and has many other problems.Instant non-residue cellulose fracturing fluid is composed of 0.4% Hydroxyethyl carboxymethyl cellulose,FAG-500,0.2% tackifier FAZ-1,0.5% modifier FAJ-305.

The base solution of traditional cellulose fracturing fluid,under medium degree of mineralization,is 67.5mPa.s.In PH 4.5-5.0,mixing the crosslinking agent FAC-201 in the base solution could get gel.Under the conditions of 120℃, 170s-1,the viscosity of fracturing fluid is around 150mPa.s after 70 minutes of gel shear,it will be suitable for the fracturing of reservoir stratum which is lower than 130℃.Add 0.002% gel breaker ammonium persulfate,after 1.5 hours of gel shear under the conditions of 100℃ and 170s-1,the gel breaker will not destroy the rheological property of the construction system.There will be not residue after gel breaking,the surface tension of the gel breaker fluid is 24.44mN/m,the interfacial tension is 3.20mN/m.

The storage modulus G’and loss modulus G’’ of 0.3% FAG-500 fracturing fluid gel respectively are 7.2Pa and 1.6Pa.The cross-linked gel sand-carrying fluid of 40% sand ratio is heated by water bath of 90℃ for 6 hours, there is no desilting phenomenon,the sand-carrying performance is very good.The damage rate caused by the fracturing fluid to core permeability is 24.75%.

This instant non-residue cellulose fracturing fluid has many advantages,such as,being instant and easy to blend,acid cross-linked,could be used without proof of agent. According to the result of on-site application in two dense oil wells and dense gas well in changqing oilfield,the success rate of construction is more than 95% and the effective rate is 100%.

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