渗透率、剪切速率及压力的影响
This paper discusses the results of an industry consortium established to understand and allow modeling of the fluid leakoff process in hydraulic fracturing applications.Over 1,000 laboratory experiments structured to study the effects of shear rate,permeability,differential pressure,temperature,gel concentration,fluid-loss additives,and fluid type have been conducted.Fluid-1oss data was measured with a state-of-the-art
experimental setup that included fluid preconditioning loops for high shear and low shear regimes and a novel cell design that minimized flow irregularities.Part 2 presents the results of
experiments involving linear hydroxypropyl guar(HPG)gel, HPG/borate systems,and HPG/titanate systems at shear rates between Oand 200 see”’,pressures between 500 to 10,000 psi,
a temperature of I t30°F,and core permeabilities between 0.1 md and 1000 md.