SEP-1水泥膨胀剂在长封固段固井中的研究与应用

RESEARCH AND APPLICATION OF SPE-1 EXPANDING AGENT IN LONG CEMENTING SECTION

摘要: 吐哈油田为解决长封固段固井质量问题,研制出SNC(减轻剂)+SEP-1(膨胀剂)低密度、高强度油井水泥。经现场7口井试验,未发生井漏、憋泵、低返等问题,质量全优,大大提高了固井质量。实践证明,SNC可防漏、防塌和保护油气层;SEP-1可大大降低析水,可补偿水泥凝固时体积的收缩,增加水泥石强度30%~50%。两种外加剂联合使用,可配成低密度、高强度水泥浆。由于加大了水灰此,一方面加大了水泥浆的紊流程度,提高了顶替效率;另一方面减少了水泥用量,降低了国井成本。SEP-1单独使用,可配成高密度水泥浆。

Abstract: To improve long section cementing quality in Tuha oil field, the SNC light weight additive and SEP-1 expanding agent was developed which were used in the oil well cement with highstrength and low density-Application on site showed that SNC have helped to decreasing lost circulation, keeping borehole stabilization and preserving pay zone, and SEP-1 Can decrease cement dehydration and cement volume loss and increase cement strength by 30~50 percent.