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本文提出用尿素作为ｐＨ调节剂．加快硫酸亚铁单液法调剖剂中亚铁离子在地层温度下的沉淀，增大沉淀率，提高封堵效能。岩芯流动试验结果表明，１５％ＦｅＳＯ＿４·７Ｈ＿２Ｏ／５％尿素调剖剂体系的封堵能力比不含尿素的体系增大近一倍。
This paper proposes the use of urea as a pH regulator. Accelerate the precipitation of ferrous ions in the formation of ferrous sulfate single-liquid profile control agent, increase the precipitation rate and improve the sealing efficiency. The core flow test results show that the plugging capacity of 15% FeSO 4 · 7H 2 O / 5% urea profile control system nearly doubles than that of urea-free system.