耐高温可携砂交联酸配方优化与评价

Optimization and Evaluation of a High Temperature Resistant and Proppant Transportable Crosslinked Acid System

肖 博 张士诚 张 雄 柳凯誉 张 健 艾 磊

XIAO Bo ?ZHANG Shicheng? ZHANG Xiong LIU Kaiyu ZHANG Jian AI Lei?

酸压携砂可以实现加砂压裂的高导流能力及常规酸压的多裂缝效果，而选择耐高温可携砂的酸液体系是实现酸压携砂的关键。针对目前国内外适于深层高温施工交联酸体系较少的现状，通过室内实验研制了一种耐高温可携砂交联酸压裂液体系，配方为20%盐酸+1.0%稠化剂YT-217+1.6%交联剂JQ-1+0.4%交联剂JP-2+2%JG-1高温缓蚀剂+ 1.0%助排剂JZ-1 +1.5%铁离子稳定剂JF-1。评价结果表明，该体系交联时间为95 s左右，具有一定的延迟交联特性；该体系的耐温、抗剪切性能良好，在150℃、170 s-1条件下剪切120 min后的黏度大于50 mPa?s，且具有破胶彻底、与地层配伍性好、携砂能力强等优点，可以满足现场施工要求。

Combing acid fracturing with proppant can achieve the high fracture conductivity of fracturing with sand and multi-fracture system of conventional acid fracturing. Performance of acid system has significant influence on treatment effectiveness. In view of the present situation of lack in crosslinked acid system suited to be applied in deep and high temperature formations, a novel high temperature resistant and proppant transportable crosslinked acid system was developed based on laboratory research. The formulation was as follows, 20% hydrochloric acid +1.0% thickener YT-217+1.6% crosslinking agent JQ-1+0.4% crosslinking agent JP-2+2% high temperature corrosion inhibitor JG-1 + 1% cleanup additive JZ-1 +1.5% ferric ion stabilizer JF-1.The experimental results showed that crosslinking time of the system was 95 s, indicated that the system possessed the crosslinking-delay properties. The fluid system had a good temperature and salt resistance performance, the viscosity of the system could maintain up to 50 mPa?s after sheared at the temperature of 150℃and the shear rate of 170 s-1 for 120 min. Furthermore, the system exhibited the peculiarity of completed gel breaking, good compatibility with formation and strong proppant-carrying capacity, which ensured that the fluid system could meet the requirements of the fracturing treatment.