Analysis of Damage Mechanism of Guanidine Gum Fracturing Fluid to Reservoir in Ta 24 Area
The reservoir in Ta 24 block is a typical tight reservoir with immature development,complex formation properties and unclear fracture fluid damage mechanism.In order to determine the damage mechanism of guani-dine gum fracturing fluid system on the reservoir of Ta 24 block,guanidine gum fracturing fluid system is divided into guanidine gum fracturing fluid base,gel breaking fluid,guanidine gum fracturing fluid filtrate,guanidine gum fracturing base fluid and gel breaking fluid.The influence of four kinds of fluids on the conductivity of core is tested by core acidification flow meter,and the liquid distribution and pore throat changes in core are analyzed by combining CT scanning technology.The damage mechanism of four different fluids to reservoir was revealed.The experimental results show that the guanidine gum fracturing base fluid and gel breaking fluid can cause the most serious damage to the reservoir,mainly due to guanidine gum plugging and core acid corrosion precipitation.The guanidine gum fracturing fluid base fluid blocked the large pore throat in the core,and the gel breaking fluid blocked the large pore throat and the small and medium pore throat in the core.After the modified formula of guanidine gum fracturing fluid,the mass fraction of guanidine gum is 0.35％,the mass fraction of potassium per-sulfate in the gel breaking fluid is 0.06％,the core pore damage rate is reduced by 9％,and the pore throat dam-age rate is reduced by 41％,and the optimization effect is remarkable.
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