页岩低分子烷烃无水压裂液研究

发布时间：2018-05-13 01:12

本文选题：页岩气 + 压裂　；参考：《西南石油大学》2015年硕士论文

【摘要】：我国页岩气资源潜力巨大,开发前景极其诱人。压裂改造是实现页岩储层有效开发并保证长期稳定生产的最重要工程技术措施,目前开发页岩气主要采用的滑溜水大型压裂要消耗大量水资源并可能污染环境,而我国页岩气勘探的有利区域大部分处于山区、丘陵等重要缺水地区或邻近区域,面临着严峻的水资源约束及环保问题,有必要开展无水压裂技术研究,为我国页岩气未来大规模高效开发奠定基础。本文对页岩低分子烷烃无水压裂液进行了探索性研究,完成了以下工作： (1)以五氧化二磷、磷酸三乙酯等为原料合成出了胶凝剂磷酸酯,对胶凝剂磷酸酯进行了电位滴定与表观黏度测试评价,优选出胶凝剂磷酸酯的最优合成条件,对最优合成条件下磷酸酯的结构进行了红外光谱和核磁共振波谱表征,证实合成样品中的主要组分与设想一致。 (2)筛选出主剂Fe2(SO4)3、交联促进剂Jl和络合剂L1,通过加量优化形成了复合交联剂,获得了复合交联剂的最优制备工艺条件。 (3)对交联后的低分子烷烃无水压裂液体系的配方进行了优化,得到了最佳交联比和最佳胶凝剂浓度。测试了低分子烷烃无水压裂液的交联性能、耐温耐剪切性能、携砂性以及破胶性。测试表明,正戊烷烃基压裂液在60℃、170s-1下连续剪切1.5h,黏度保持在100mPa·s以上；正己烷烃基压裂液在90℃、170s-1下剪切1.5h,黏度保持在80mPa·s以上。 (4)分别对不同胶凝剂浓度和不同烷烃基液交联后冻胶的流变特性进行了测试分析,发现各交联冻胶体系具有明显的黏弹性、触变性和剪切变稀性；最后利用非线性共转Jeffreys本构方程对各交联冻胶体系的流动曲线进行了表征。本文针对无水压裂液研究具有开创性,研究难度较大。论文成果将推进无水压裂液技术的进步,为继续完善形成具有工业应用价值的无水压裂液奠定了基础。
[Abstract]:The shale gas in China has great potential and great development prospect . The fracturing transformation is one of the most important engineering measures to realize the effective development of shale reservoirs and guarantee the long - term stable production .

( 1 ) The phosphate ester was synthesized by using phosphorus pentoxide and triethyl phosphate as raw materials , and the potential titration and apparent viscosity test were carried out on the gelling agent phosphate ester . The optimal synthesis conditions of the phosphate ester were optimized . The structure of the phosphate ester under the optimum synthesis conditions was characterized by IR and NMR . It was confirmed that the main components in the synthesized sample were consistent with the assumption .

( 2 ) the main agent Fe2 ( SO4 ) 3 , the crosslinking accelerator Jl and the complexing agent L1 are screened , the composite cross - linking agent is formed by the addition amount optimization , and the optimal preparation process conditions of the composite cross - linking agent are obtained .

( 3 ) The formula of the crosslinked low molecular alkane anhydrous fracturing fluid system is optimized , the optimum crosslinking ratio and the optimum concentration of gelling agent are obtained . The cross - linking property , the temperature resistance , the shearing resistance , the sand carrying property and the gel breaking property of the low molecular alkane anhydrous fracturing fluid are tested . The test shows that the n - pentane - based fracturing fluid is continuously sheared for 1.5 hours at 60 DEG C and 170s - 1 , and the viscosity is kept above 100mPa & # xb7 ; s ;
The n - hexane hydrocarbon - based fracturing fluid was sheared for 1.5 h at 90.degree . C . , 170s - 1 , and the viscosity was maintained above 80 mPa & # xb7 ; s .

( 4 ) The rheological properties of the frozen glue after cross - linking of different gelling agents and different alkane groups were tested and analyzed . It was found that the cross - linked freeze - gel systems had obvious viscoelasticity , thixotropic and shear thinning ;
Finally , the flow curve of each cross - linked gel system was characterized by nonlinear corotation Jeffreys constitutive equation .

In this paper , the research of water - free fracturing fluid is very difficult to study . The results of this paper will advance the progress of anhydrous fracturing fluid technology and lay the foundation for the continuous improvement of the anhydrous fracturing fluid with industrial application value .

【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.12

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