不同化学剂对缔合结构压裂液破胶影响

姬思雪; 杨江; 李冉; 秦文龙; 邱晓慧

doi:10.3969/j.issn.1001-5620.2016.01.025

不同化学剂对缔合结构压裂液破胶影响

doi: 10.3969/j.issn.1001-5620.2016.01.025

1.
西安石油大学石油工程学院, 西安 710065
2. 中国石油勘探开发研究院廊坊分院, 河北廊坊 065007

基金项目: 国家自然科学基金"黏弹性表面活性剂用于油气增产压裂液的应用基础研究"(51174163)和"热电纳米材料与高分子材料对清洁压裂液的协同增效机理研究"(51304159),西安石油大学全日制硕士研究生创新基金资助(2013cx120102)

详细信息

作者简介:
姬思雪,在读硕士研究生,1990年生,现就读于西安石油大学油气田开发专业,主要从事黏弹性表面活性剂压裂液流变性方面的研究。电话18713006787;E-mail:jsx0831@163.com。

中图分类号: TE357.12
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出版历程
- 收稿日期: 2015-09-19
- 刊出日期: 2016-01-30

Effect of Chemicals on Gel Breaking of Associative Structure Fracturing Fluid

1.
College of Petroleum Engineering, Xi'an Shiyou University, Xi'an Shaanxi 710065, China
2. Langfang Branch of Research Institute of Petroleum Exploration and Development, Langfang Hebei 065007, China

摘要

摘要: 为解决超分子缔合结构压裂液在特殊储层的破胶难题,实现该新型体系的大规模应用,通过比较90℃下不同添加剂对压裂液流变性能的影响,研究了有机溶剂、过氧化物、柴油、煤油、醇类以及复配添加剂对超分子缔合结构压裂液的破胶效果。结果表明,在90℃下,0.5%有机溶剂乙二醇单丁醚和三乙醇胺分别使压裂液黏度下降了80和77 mPa·s,并保持最低黏度为30 mPa·s;0.1%过硫酸钠120 min可使压裂液黏度降到4.312 mPa·s,破胶效果明显;加入0.6%柴油和煤油,破胶时间分别为50和40 min;多元脂肪醇与缔合高分子相互作用可以降低压裂液黏度, 1.0%正辛醇能使超分子缔合结构压裂液黏度下降到24 mPa·s;不同化学剂的复配可以缩短破胶时间,其中0.03% FeSO4、0.05% FeS分别与0.1%过硫酸铵复配可将破胶时间缩短60 min。通过以上方法可实现缔合结构压裂液在无原油存在的情况下破胶。
- 缔合结构压裂液 /
- 破胶 /
- 化学助剂 /
- 黏度影响
Abstract: Supermolecules used in fracturing fluids form associative structures, making the gels of the fracturing fluids very difficult to break. Studies on the effects of several additives on the gel breaking performance of fracturing fluids at 90℃ were conducted. The fracturing fluids used have supermolecular associative structures in them, and the additives tested include organic solvents, peroxide, diesel oil, kerosene, alcohols and mixture of these additives. It is found that at 90℃, addition of 0.5% ethylene glycol monobutylether and 0.5% triethanolamine in a fracturing fluid reduces the viscosity of the fracturing fluid by 80 mPa·s and 77 mPa·s, respectively, and the minimum viscosity of the fracturing fluid maintains at 30 mPa·s. Addition of 0.1% sodium persulfate in a fracturing fluid reduces the viscosity of the fracturing fluid to 4.312 mPa·s in 120 min, showing remarkable potential in gel breaking. Addition of 0.6% diesel and 0.6% kerosene in a fracturing fluid, breaks the gel in 50 min and 40 min, respectively. Interaction between poly fatty alcohols and the association polymers will reduce the viscosity of the fracturing fluid; addition of 1.0% n-octanol reduces the viscosity of fracturing fluids containing supermolecular associative structure to 24 mPa·s. Mixture of chemicals can also reduce the time for gel breaking. For instance, a mixture of 0.03% FeSO4 and 0.1% ammonium persulfate reduces the time by 60 min, and so does the mixture of 0.05% FeS and 0.1% ammonium persulfate. Using the methods described above, gels of fracturing fluids containing supermolecular associative structures can be broken, with no intervention from crude oil.
- Associative structure fracturing fluid /
- Gel breaking /
- Chemical additive /
- Effect of viscosity

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参考文献(12)

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