压裂用有机硼交联剂GCY-1的研究

Synthesis of Organic Boron Cross Linker GCY-1 for Aqueous Gelling Fracturing Fluids

关键词:  压裂液  GCY-1  有机硼交联剂  中、低温储层

Key words:  fracturing fluid organic  boron cross linker  the low-to-moderate temperature reservoir bed

摘要:

针对川西中、低温储层缺乏自主研发的压裂液交联剂的现状,在对比国内外压裂液交联剂的优缺点和适用范围的基础上,选择合成了有机硼交联剂。通过对合成条件的考察,得到了有机硼交联剂的最佳合成工艺:溶剂为水与乙二醇复配,配位体为葡萄糖与乙二醇复配,加量为20%;催化剂为NaOH,反应温度为70℃,反应时间为2.5h,硼砂∶葡萄糖=4x∶y。合成的有机硼交联剂交联时间在30s～3min可调,形成的压裂液冻胶在80℃、65℃和45℃,170s-1条件下剪切120min,粘度均大于80mPa·s;能彻底破胶,破胶液粘度≤5mPa·s。该交联剂适合川西中、低温储层压裂改造的需要。

Abstract:

In view of the low-to-moderate temperature reservoir bed lacking cross linker autonomously for fracturing fluid,the article chooses synthesis of organic boron cross linker,on the basis of comparing with the pros and cons and the applicability of cross linker for fracturing fluid home and abroad. By experimentally studying the conditions of synthesis,the best technology of synthesis has been gained about organic boron cross linker: solvent is combination solution of water and glycol,20% legend compounds are dextrose and glycol; accelerator is NaOH,reaction temperature 70℃ and reaction time 2.5h,the ratio of borax and dextrose is 4x∶y. The cross linking time of organic boron cross linker is 30s～3min,their viscosities of the gel all>80mPa.s since shearing 120min in the conditions of 80℃,65℃,45℃,170 S-1; And breaking gel thoroughly that viscosity ≤5mPa·S,which is fit for needs of fracture about the low-to-moderate temperature reservoir bed in the west of Sichuan.