压裂液缝内黏滞阻力实验研究

国外研究表明，压裂液的缝内黏滞阻力对气产量影响较大，即使只有0．0030kPa的黏滞阻力．也会在一定程度上降低气产量。文中采用支撑剂导流能力测定装置，自创了一套压裂液黏滞阻力的实验测定方法。通过系列实验得知：相同砂比、铺砂浓度备件下，高质量分数瓜胶压裂液的缝内黏滞阻力大于低质量分数瓜胶压裂液：同一套压裂液体系．低砂比段的缝内黏滞阻力大于高砂比段。因此，缝内黏滞阻力造成的支撑缝失效位置主要分布在低砂比段。另外．加入纤维有利于降低压裂液的缝内黏滞阻力。该研究成果为定量研究压裂液在支撑裂缝内的黏滞阻力提供了一套独特、可行的实验方法．在国内少有先例。

Experimental study on viscous resistance of fracturing fluid within support seam

Overseas research shows that the viscous resistance of fracturing fluid within the support seam impacts on gas production greatly. Even if only having 0.003 0 kPa viscous resistance, gas production will reduce to some extent. In this paper, the experimental method for determining the viscous resistance of fracturing fluid is created using the measuring device for proppant conductivity. A series of experiments show that under the same sand ratio and sanding concentration, the viscous resistance within support seam for the fracturing fluid with high concentration guar is greater than that for low concentration guar. And for the same set of fracturing fluid system, the viscous resistance in low sand ratio segment is greater than that in high sand ratio segment. Therefore, the lallure location of support seam length mainly distributes in the low sand ratio segment due to viscous resistance within the support seam. In addition, fiber helps to reduce the viscous resistance of fracturing fluid. This study can provide a viable experimental method for the quantitative study for the viscous resistance of fracturing fluid, which seldom has a precedent at home and abroad.