新型疏水缔合聚合物压裂液综合性能评价

STUDY ON PROPERTIES OF NEW HYDROPHOBIC ASSOCIATING POLYMER FRACTURING FLUID

以丙烯酰胺、丙烯酸钠等为单体,按照溶液聚合法制备了新型疏水缔合聚合物增稠剂(SRFG-1),进而合成了一种不含金属元素的低分子化合物交联剂(SRFC-1)。以SRFG-1增稠剂和SRFC-1交联剂为主剂,配制了一种新型疏水缔合压裂液体系(SRFG),评价了该体系的耐温耐剪切性能、静态悬砂性能、破胶性能和静态滤失性能,并考察了该压裂液滤液对岩心基质伤害率及SRFG-1增稠剂的降阻率。结果表明:SRFG压裂液在140℃、170s-1条件下具有良好的流变性能,24h和48h内的沉降速率分别为4.6×10-4 mm/s和6.9×10-4 mm/s;在80℃,破胶剂加入量为0.01%条件下,1h即可破胶,破胶液黏度为3.84mPa·s,破胶液表面张力为26.5mN/m,破胶液基本无残渣;初滤失量为1.289×10-2 m3/m2,滤失系数为8.47×10-4 m/min0.5,滤失速率为2.63×10-4 m/min;压裂液滤液对岩心基质伤害率为10.25%;SRFG-1增稠剂的降阻率为60.15%。

Using acrylamide and sodium acrylate as main raw materials,a new kind of hydrophobic as sociating polymer fracturing fluid gelling （SRFG-1） has been developed by solution polymerization.The cross-linker（SRFC-1）,a kind of low molecular compound,containing no metal element has been further synthesized.A new kind of hydrophobic associating polymer fracturing fluid （SRFG）has been prepared based on SRFG-1 and SRFC-1.Temperature resisting and shearing resistance performance,stability proppant-carrying performance,viscosity break performance and stability filtration performance are studied.The effects of fracturing fluid on permeability damage of core and drag reduction rate are investigated.The results are shown that SRFG fracturing fluid has better temperature resisting and shearing resistance performance under the conditions of 140 ℃ and 170 s-1.The settlement rates are 4.6× 10-4 mm/s and 6.9 × 10-4 mm/s within 24 h and 48 h,respectively.The viscosity of gel breaking liquid is 3.84 mPa · s under the conditions of 80 ℃,0.01 ％ APS and 1 h.The surface tension is 26.5 mN/m and the residue content of gel breaking liquid is very little.The filtration loss is 1.289 × 10-2 m3/m2,the filtration coefficient is 8.47 × 10-4 m/min0.5 and the filtration rate is 2.63 ×10-4 m/min.The permeability damage rate of core matrix caused by SRFG is 10.25 ％ while the drag reduction rate of SRFG-1 is 60.15％.