一种新型自支撑压裂液体系实验研究

doi:10.13809/j.cnki.cn32-1825/te.2020.02.021

摘要/Abstract

摘要：

水力压裂是油气藏增产改造的重要技术手段,已广泛应用于国内外各大油田生产中。通过对压裂液体系进行大量文献调研后发现,目前压裂液体系的各种改进,主要围绕着“携砂”在进行。提出了一种新型自支撑压裂液体系,该液体体系完全摆脱了“携砂”的概念,在压裂液泵注过程中完全不携带固体支撑剂,而是将压裂液与支撑剂结合为一体,当液体到达目的层后通过地层温度控制由液相转化为固相支撑压裂裂缝。实验获得的自支撑压裂液体系能够在85 °C、30 min内形成具有一定圆球度和强度的支撑固体。液体体系的黏度上限为45.58 mPa·s,具有良好的注入性和稳定性。液体相变后形成的固体支撑剂密度为1.07 g/cm ³,分选系数为1.41,主要粒径为20~40目和40~70目,其破碎率分别为4.7 %和8.75 %。

关键词: 水力压裂, 压裂液, 支撑剂, 自支撑, 相变

Abstract:

Hydraulic fracturing is an important technical means for stimulation and transformation of oil and gas reservoirs, and has been widely used in the production of major oil fields at home and abroad. After studying a large number of literature research on the fracturing fluid system, it is found that various improvements of the current fracturing fluid system are mainly around “carrying sand”. However, in this paper, a new type of self-supporting fracturing fluid system is innovatively put forward, which completely gets rid of the concept of "carrying sand". In the process of fracturing fluid pumping, there is no solid proppant at all, but the fracturing fluid is combined with the proppant as a whole. When the fluid reaches the target layer, it is affected by the formation temperature and transformed from liquid phase to solid-state to prop up the fracturing fractures. The obtained self-supporting fracturing fluid system can form supporting solids with certain sphericity and strength at 85 ℃ and in 30 minutes. The upper limit of liquid system viscosity is 45.58 mPa·s, bringing the system good injectivity and stability. The density of the solid-state proppant is 1.07 g/cm³, the separation coefficient is 1.41, the main particle size range is 20~40 and 40~70 mesh, and the crushing rate is 4.7 % and 8.75 %, respectively.

Key words: hydraulic fracturing, fracturing fluid, proppants, self-propping, phase change

中图分类号:

TE357

赵立强,陈一鑫,刘平礼等. 一种新型自支撑压裂液体系实验研究[J]. 油气藏评价与开发, 2020, 10(2): 121-127.

Liqiang ZHAO,Yinxin CHEN,Pingli LIU, et al. Experimental study on a new type of self-propping fracturing fluid[J]. Reservoir Evaluation and Development, 2020, 10(2): 121-127.

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测试项目	目数/目	闭合压力/MPa	破碎率/%
抗破碎测试压力及指标	20~40	69	≤5
抗破碎测试压力及指标	40~70	86	≤10
材料破碎率测试	20~40	69	4.70
材料破碎率测试	40~70	86	8.75