微纳尺度冻胶分散体杨氏模量对封堵性能影响

Influence of Young′s Moduli of Micro and Nano Scale Dispersed Particle Gels on Plugging Performances

致密/页岩油气长期压裂开发下优势窜流通道发育,冻胶分散体在流道调控扩大波及方面具有很好的应用效果。冻胶分散体机械强度与其宏观封堵性能间应有密切关系,然而,目前的冻胶分散体机械强度缺乏有效表征手段。以铬冻胶分散体为例,通过原子力显微镜直接测量了微纳尺度铬冻胶分散体杨氏模量,并通过对其宏观封堵性能进行评价,从而建立了二者间映射关系。研究表明,控制聚合物质量分数为0.3%,SD-107质量分数由0.4%增大到0.7%,本体冻胶强度随之增大,相应冻胶分散体杨氏模量也随之增加。当杨氏模量自159 Pa上升至633 Pa时,封堵率由93.23%上升至98.08%。通过调控微纳尺度冻胶分散体杨氏模量研究其封堵性能差异,为致密/页岩油气储层高效开发提供基础理论指导。

Under the long-term fracturing of tight/shale oil and gas,where preferential channeling migration pathway developed,the dispersed particle gels has excellent performance effects in the control of the flow channel and expansion of the sweeping.Dispersed particle gels have excellent effects in improving the heterogeneity of tight oil/shale oil and gas reservoirs.A close relationship lies between the mechanical strength of the dispersed particle gels and their macro plugging performances.However,currently there is no effective method for characterization of the mechanical strength of the dispersed particle gels.Tacking the chromium crosslinked dispersed particle gels have been chosen as the examples,We measured the Young′s modulus of dispersed particle gels at the nano and micro scales by atomic force microscope,and the mapping relationship between them is established by evaluating its macroscopic plugging performances.The research results indicate that when the fixed mass fraction of polymer is 0.3%and the mass fraction of SD–107 increases from 0.4%to 0.7%,the strength of the bulk gels increases,and the Young′s modulus of the corresponding dispersed particle gels also increase.When Young′s modulus increases from 159 Pa to 633 Pa,the plugging rate can rise from 93.23%to 98.08%.In this study,the Young′s moduli of micro and nano scale dispersed particle gels are adjusted to study the difference in plugging performances,which provides theoretical foundation for the efficient development of tight/shale oil and gas reservoirs.