Synthesis And Evaluation Of Clay Stabilizer For Volume Fracturing Fluid

Because expanding of clay minerals influences the effect of volume and fracturing fluid requires a lot of fluid volume, commonly used clay stabilizer application limit is large, the better application effect of clay stabilizer has been urgent need.With the progressing of quaternary ammonium salt of clay stabilizing agent technology, appeared with different structures and performances of new types of clay stabilizers.Clay stabilizer PA1,PA2, CETPA were synthesized for volume fracturing in this paper.PA1,PA2,CETPA synthesis conditions are optimized, it is concluded that the optimum synthesis conditions of PA1:temperature 60 ℃, time of 5h, the initiator concentration1%,epoxy chloropropane and mole ratio of 1:1 for the methyl ethyl amine;conditions of PA2:reaction temperature 70℃, reactant mole ratio of 1:1,4 h reaction time, reactant concentration30%, catalyst concentration is 1.0%; CETPA conditions: mole ratio of 1:1, catalyst concentration 0.8%, the reaction temperature of 55 ℃.Synthesis of clay stabilizer and formation water compatibility is good, do not produce turbidity precipitation. 1% concentration of PA1,PA2,CETPA clay stabilizer prevent expansion rate are 93.4%, 91.9%,89.4%.PA1,PA2,CETPA clay stabilizing agent of core flow experiment shows that synthetic PA1,PA2 CETPA can be used as a fracturing fluid clay stabilizer of low permeability formation.CETPA clay stabilizing agent and compatibility evaluation of fracturing fluid, compares its shear resistance of fracturing fluid, gel breaking, the influence of formation damage ability.The experimental results show that CETPA clay stabilizer for fracturing fluid compatibility is good. CETPA can be used as a clay stabilizer of volume fracturing fluid.