自生热体系对压裂液破胶性能影响分析
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中国石油大学(北京)

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Effect of autogenous heat system on fracturing fluid gel breaking performance
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    摘要:

    针对低温浅层油气井压裂破胶不彻底、返排能力较低的问题,着重分析了亚硝酸盐与铵盐、三氧化铬和葡萄糖、过氧化氢等三种不同自生热体系的生热量以及对压裂破胶性能的影响。实验结果表明:亚硝酸盐与铵盐生热体系的生热量最高,温度可达到80℃以上;另外,在实验中也确定了三种不同生热体系与破胶剂的添加顺序,使压裂液破胶效果达到最优,其中葡萄糖和三氧化铬生热体系和亚硝酸盐与铵盐生热体系的加入顺序是先加入生热体系后加入APS破胶剂,过氧化氢生热体系的加入顺序是自生热体系和APS破胶剂两者同时加入;最后,得出亚硝酸盐与铵盐自生热体系是压裂液破胶体系的最佳添加剂,能使压裂液粘度降低到6 mPa.s以下,破胶性能最优。

    Abstract:

    Aiming at the problems of incomplete fracturing and low flowback ability in low-temperature shallow oil and gas wells, the heat generation of three different autogenous heat generation systems, including nitrite and ammonium salt, chromium trioxide, glucose, and hydrogen peroxide, was investigated. And the impact on the fracture gel breaking performance. The experimental results show that the heat generation of the heat generating system of nitrite and ammonium salt is the highest, and the temperature can reach above 80℃. In addition, the order of addition of three different heat generating systems and breakers is also determined in the experiment to make fracturing The liquid gel breaking effect is the best. Among them, the order of adding the heat generating system of glucose and chromium trioxide and the heat generating system of nitrite and ammonium salt is to add the heat generating system first, then add the APS breaker and hydrogen peroxide heat generating system. The order of addition is to add both autogenous heat system and APS breaker at the same time; finally, it is concluded that the autogenous heat system of nitrite and ammonium salt is the best additive for fracturing fluid gel breaking system, which can reduce the viscosity of fracturing fluid to 6 Below mPa.s, the best glue breaking performance.

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  • 收稿日期:2020-10-05
  • 最后修改日期:2020-12-23
  • 录用日期:2020-12-31
  • 在线发布日期: 2021-08-25
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