不同化学剂对缔合结构压裂液破胶的影响  

Effect of Chemicals on Gel Breaking of Associative Structure Fracturing Fluid

作　　者：姬思雪 杨江[1,2] 李冉[1] 秦文龙[1] 邱晓慧[2] 

机构地区：[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

出　　处：《钻井液与完井液》2016年第1期122-126,共5页Drilling Fluid & Completion Fluid

基　　金：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)

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30mPa·s;0.1%过硫酸钠120min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%FeSO_4、0.05%FeS分别与0.1%过硫酸铵复配可将破胶时间缩短60min。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。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 rain, 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 rain, 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.

关 键 词：缔合结构压裂液 破胶 化学助剂 黏度影响 

分 类 号：TE357.12[石油与天然气工程—油气田开发工程]