摘要
加重压裂液是解决施工压力过高的有效手段之一，但普通胍胶加重压裂液存在残渣含量高、管路摩阻大、不抗剪切等缺点，而一般VES类压裂液使用温度受限。针对以上问题，本文研究了密度达到1.3g/cm3，耐温达到140℃的新型加重压裂液体系，压裂液配方为: 0.6%GRF-1H+0.3%稠化辅剂GRF-2+37.05%加重剂JZ12，并评价了该体系的动态携砂性能、耐温耐剪切性、滤失性及对裂缝导流能力的伤害。实验表明：新型加重压裂液黏度达到22 mPa·s以上时就具有良好的携砂性能，该体系具有良好的抗温、抗剪切性能，而且随着密度的上升，体系具有显著的盐增稠效应。使用真实岩心评价了该体系的静态滤失性能，该体系没有滤饼但却具有良好的控制滤失能力。该体系对裂缝导流能力的伤害率仅为8.94%，远小于硼交联HPG压裂液。
Abstract
Weighted fracturing fluid is one of the effective means to solve the too high pressure problem during the process of fracturing operation. However, the common weighted gel fracturing fluid has some disadvantages, such as high residue content, huge tube frictional resistance, low shear resistance, etc. At the same time, most of clean fracturing fluid can not be used at high temperature. To solve the above problems, a novel weighted fracturing fluid (WFF) that the density reached to 1.3 g/cm3 and more and the temperature-resistant was 140℃ was investigated. The formula of the WFF was established as follows: 0.6% thicker GRF-1H, 0.3% thickening additive GRF-2 and 37.05% weighting agent JZ12. The dynamic sand-carrying properties, temperature and shear resistance proerty, filtration performance and fracture conductivity of the WFF were evaluated. The experiment results showed that as long as the viscosity reached up to 22 mPa·s, the WFF could possess a good sand-carrying performance. High-temperature rheologic tests showed that the WFF system has good temperature and shear resistance property. With the increase of density, there was a significant thickening effect of salt. The static filtraition performance of the system was evaluated using real cores. The WFF system did not contain water insoluble but it had low filtration coefficient. The damage of the WFF on the fracture conductivity was only 8.94%, which was far less than that of boron crosslinked HPG fracturing fluid.
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