胍胶压裂液有机硼交联剂JSA-1的合成与性能评价

Synthesis and performance evaluation of organic boron crosslinking agent JSA-1 for guar gum fracturing fluid

摘要:

以硼酸、正丁醇、乙二醇、二乙烯三胺为反应原料，采用一锅法合成了有机硼交联剂JSA-1。通过考察胍胶质量分数（胍胶占胍胶基液总质量的百分数）、JSA-1用量（以胍胶基液质量为基准）、pH等影响因素，系统评价了JSA-1的交联性能。结果表明：胍胶质量分数越大（0.09%~0.4%），胍胶压裂液的交联状态越好、交联时间越短、表观黏度越高、耐温能力越强；JSA-1用量越大（0.04%~0.4%），胍胶压裂液的交联状态越好、交联时间越短、耐温能力越强；pH（pH=4~14）越高，胍胶压裂液的交联时间越长、耐温能力越强。JSA-1对pH和胍胶质量分数的适用范围较广，在低温配方方面，可以使低质量分数的胍胶实现有效交联，胍胶质量分数为0.13%的胍胶基液与JSA-1交联后，在常温剪切下表观黏度可达到50 mPa·s；在高温配方方面，胍胶质量分数为0.4%的胍胶基液与JSA-1交联后制备的压裂液具备较好的耐温耐剪切能力，在120 ℃剪切条件下表观黏度可以稳定保持在300 mPa·s左右。

Abstract:

The organic boron crosslinking agent JSA-1 was synthesized using boric acid, n-butanol, ethylene glycol, and diethylenetriamine as raw materials using a one-pot method. The crosslinking performance of JSA-1 was systematically evaluated by examining factors such as the mass fraction of guar gum (the percentage of guar gum to the total mass of guar gum base solution), the dosage of JSA-1 (based on the quality of guar gum base solution), and pH. The results show that the higher the mass fraction of guar gum (0.09%~0.4%), the better the crosslinking state, shorter the crosslinking time, higher the apparent viscosity, and stronger the temperature resistance of guar gum fracturing fluid; The larger the dosage of JSA-1 (0.04%~0.4%), the better the crosslinking state, shorter the crosslinking time, and stronger the temperature resistance of guar gum fracturing fluid; The higher the pH (pH=4~14), the longer the crosslinking time and stronger the temperature resistance of guar gum fracturing fluid. JSA-1 has a wide range of applications for pH and guar gum mass fraction. In terms of low-temperature formula, it can effectively crosslink low mass fraction guar gum. When the guar gum base solution with a mass fraction of 0.13% is crosslinked with JSA-1, the apparent viscosity can reach 50 mPa·s at room temperature shear. In terms of high-temperature formula, the fracturing fluid prepared by cross-linking a 0.4% guar gum base solution with JSA-1 has good temperature and shear resistance, and its apparent viscosity can be stably maintained at around 300 mPa·s under 120 ℃ shear conditions.