响应面法优化中高温低浓度香豆胶压裂液体系

Formula Optimization of Low Concentration Fenugreek Gum Fracturing Fluid System for Reservoir with Middle-high Temperature by Response Surface Methodology

唐国旺 刘嘉露 郑承纲 张锁兵 赵梦云 苏长明 于培志

TANG Guowang LIU Jialu ZHENG Chenggang ZHANG Suobing ZHAO Mengyun SU Changming YU Peizhi

为减小压裂液对储层的伤害， 降低压裂液体系中香豆胶的浓度， 避免传统方法 （多因素排列组合实验方法）工作强度大， 精确度低的问题， 采用中心复合设计（CCD）， 以香豆胶浓度、 有机硼交联剂浓度、 温度为考察指标，对实验获得的数据进行多元线性回归， 同时用建立的回归模型优化压裂液配方， 选取较低浓度的香豆胶压裂液体系并通过高温下的黏度测试进行验证。结果表明， 通过构建的拟合方程可以预测给定香豆胶压裂液体系低浓度配方下的冻胶黏度； 拟合方程中 3种因素对冻胶黏度的影响显著性顺序为： 香豆胶浓度＞温度＞交联剂浓度；基于 CCD方法得出 80数 120℃下的优化配方， 香豆胶加量为 0.175%数 0.35%、 交联剂加量为 0.37%数 0.73%时，经 1000 s-1高速剪切 2 min和 170 s-1剪切 95 min后的冻胶黏度约为 52数 154 mPa·s。该方法预测性良好， 优化出的低浓度香豆胶体系具有良好的耐温耐剪切性能。图6表2参15

In order to reduce the damage of reservoir stratum caused by fracturing fluid，one method was to reduce the concentration of fenugreek gum in fracturing fluid system. However，traditional method（multiple factors combination test method） was not accurate enough in terms of optimizing low concentration fenugreek gum in fracturing fluid system with high work intensity. In this study，central composite design methodology（CCD）was used to obtain the optimum formula of fracturing fluid. Experiment data was dealt with by mult-variable linear return analysis considering the concentration of fenugreek gum，organic boron crosslinking agent and temperature. Moreover，fracturing fluid systems with low fenugreek gum concentration were optimized based on the established linear regression model and verified by viscosity test at high temperature. The results showed that the viscosity of low concentration fenugreek gum fracturing fluid system could be predicted by the fitting equation. Three factors in fitting equation were arranged according to their influence on gel viscosity in following order：concentration of fenugreek gum＞temperature＞concentration of organic boron crosslinking agent. According to CCD，an optimum formula at 80—120℃ was obtained as follows：0.175%—0.35% fenugreek gum dosage，0.37%—0.73% crosslinking agent dosage. The viscosity of fracturing gel still maintained at 52 to 154 mPa·s after shearing at 1000 s-1 for 2 minutes and 170 s-1 for 95 minutes. The CCD provided a good predicting accuracy and the modified system had good temperature resistance and shear resistance.

10.19346./j.cnki.1000-4092.2017.01.007