返排液残余稠化剂对循环利用的影响机理研究
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1.中国石油勘探开发研究院 北京;2.中国科学院渗流流体力学研究所 河北廊坊

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国家重大科技专项(2017ZX05023-003-001)资助


Study on the mechanism of the influence of residual thickener on recycling of flowback fluid
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    摘要:

    用4种方法制备了模拟破胶返排液,通过考察降解过程分子量的变化、分子量分布与黏度的关系、残余稠化剂对循环配液的影响,给出压裂液破胶过程稠化剂的降解机理及循环利用的制约因素,结果显示,破胶4h返排液黏度合格,分子量降低至瓜胶的1/2,破胶初期氧化剂优先作用于α-1,6缩醛键,破胶液中半乳糖含量增加,残渣中甘露糖:半乳糖为4.5:1;破胶液残余稠化剂含量在0.3%以上配制的压裂液冻胶黏度明显下降,并且不耐剪切,常规氧化破胶液黏度不达标,残余稠化剂浓度增大,消耗的交联剂增加,破胶更困难,二次循环使用的冻胶破胶液分子量为251×105,远大于瓜胶的2.8×105

    Abstract:

    Simulated gel-breaking flowback fluid was prepared by four methods. By investigating the influence of molecular weight change, the relationship between molecular weight distribution and viscosity,residual thickener on circulating fluid during the degradation process, the degradation mechanism of the thickener and the limiting factors for recycling of the gel-breaking solution are given. The results show that the viscosity of the gel-breaking solution was qualified, and the molecular weight decreased to 1/2 of guar gum. The oxidant acted on α-1,6 acetal bond preferentially in the initial phase of the gel-breaking, the content of galactose in the gel breaking liquid increased, and the ratio of mannose to galactose in the residue was 4.5:1; the viscosity of the fracturing fluid prepared with the residual thickener content above 0.3% decreased obviously,and the fluid was not shear resistant. The viscosity of the conventional oxidized gel-breaking solution did not reach the standard, both the residual thickener concentration and the cross-linker consumption are increased, and the gel breaking was more difficult. The molecular weight of the gel-breaking solution used in the second cycle is 251 ×105, which is much larger than the 2.8 ×105 of Guar gum.

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历史
  • 收稿日期:2020-08-30
  • 最后修改日期:2020-12-28
  • 录用日期:2020-12-31
  • 在线发布日期: 2021-11-24
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