The factory-like volume fracturing and continuous mixing for reservoir stimulation require the fracturing fluid to have better broad-spectrum performance and faster dispersion and sticking speed in terms of water quality.This article reports a surface modified diutan gum that can be directly used to prepare non-crosslinked fracturing fluids using formation water,seawater,and reinjection water.According to SY/T 5107-2016《Evaluation Method for Performance of Water Based Fracturing Fluids》,the diutan gum and non-crosslinked diutan gum fracturing fluid was evaluated.The experimental results showed that it has good dispersibility,fast viscosity increase speed,and can reach maximum viscosity in 5～20 minutes in formation water,seawater,reinjection water,and pH 2～12 aqueous solutions,meeting the requirements of continuous mixing;0.4％diutan gum fracturing fluid has good temperature resistance,shear resistance,high elastic modulus of network structure,excellent suspended sand performance,and can meet the requirements of 140℃ fracturing operation;The 0.4％diutan gum fracturing fluid is easy to break,with a residue of 212 mg/L,which is much lower than the industry standard of 600 mg/L and has less damage to the reservoir.Through the analysis of the prospects of using diutan gum fracturing fluid,it is believed that the use of formation water,seawater,and reinjection water to develop diutan gum fracturing fluid can achieve local water use for fracturing,reduce water costs and water preparation cycles;Diutan gum fracturing fluid is more suitable for the factory-like volume fracturing and continuous mixing requirements of alkali sensitive reservoirs and unconventional dense reservoirs.
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