Development and Performance Evaluation of High Temperature Resistant Polymer Frac-turing Fluid System
With the deepening of oil and gas extraction,the demand for the development of complex formations such as high temperature,high pressure,and high salinity is increasing.The stability and performance of traditional fracturing fluids in this type of formation are limited.Based on this,this pa-per uses acrylamide(AM),acrylic acid(AA),methacryloyloxyethyl trimethyl ammonium chloride(DMC)and N,N-dimethyloctadecyl allyl ammonium chloride(DOAC)as raw materials,the high-temperature resistant thickener DPAM is prepared by free radical polymerization.Experimental results show that DPAM has good properties such as thickening,temperature resistance,shear resistance,and viscoelasticity,and is suitable for diversion acidification in carbonate formations.DPAM achieves the thickening effect by forming a three-dimensional network structure through the association of polymer molecules and the chelation of betaine side chains and calcium ions.The storage modulus G′ of DPAM solution is always higher than the loss modulus G".Its fluid loss coefficient k<1.0×10-3 m/min1/2,fil-tration rate R<1.5×104 m/min,initial filtration loss V0<5.0×10-2 m3/m2.The sedimentation rate of the ceramic particles is lower than 0.48 cm/min.When the NaBO3 dosage is 0.1%(mass fraction),the viscosity of the fracturing fluid decreases to 30 mPa∙s at 110min,indicating that the fracturing fluid sys-tem has good sand-carrying performance,fluid loss control ability,and gel breaking performance.This paper provides a theoretical basis for the synthesis and application of high-temperature resistant polymer fracturing fluid.
fracturing fluidDPAM solutionthickenerhigh temperature resistance
万方数据
维普
