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ＰＳ剂木质素磺酸碱（简称ＰＳ剂）是近年来出现的一种新型表面活性剂，是由废纸液经特殊工艺技术处理提炼而成，物理化学性能稳定，具有降低原油粘度和油水界面张力的特性。用ＰＳ剂进行驱替，可提高采收率。通过室内试验、文３１断块现场驱替试验和数值模拟分析等研究工作，进一步探讨了 ＰＳ剂的驱油机理、摸索了注 ＰＳ剂驱油的现场经验，取得了一定的研究成果和认识。
PS agent Lignosulfonic acid base (referred to as PS agent) is a new type of surfactant that appears in recent years. It is made from the waste paper liquid which is processed by special technology, and has stable physical and chemical properties. It has the functions of reducing the viscosity of crude oil and the interface between oil and water Tension characteristics. With the PS agent for displacement, can improve oil recovery. Through field tests, field displacement tests and numerical simulation analysis of Wen 31 fault block, the mechanism of oil displacement of PS agent was further explored. Field experience of PS oil displacement was explored and some achievements and understanding were obtained.