本文介绍一种新型油井水泥外加剂──分散缓凝剂ＴＤ－ｌＡ。用该外加剂处理的水泥浆流变性能好，稠化时间易调，固井成本低。在３口井的固井中试用该剂，取得了满意的效果。 This article introduces a new type of oil well cement admixture ─ ─ dispersing retarder TD-lA. The slurry treated with this admixture has good rheological properties, easy thickening time and low cementing cost. The cement was tested in 3 wells and satisfactory results were obtained.