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DZJ series cements used in the lower Palaeozoic formations of Erdos gasfield
Author(s): 
Pages: 34-35,37
Year: Issue:  6
Journal: DRILLING FLUID & COMPLETION FLUID

Keyword:  非渗透水泥浆固井质量防窜鄂尔多斯盆地北部气田;
Abstract: 鄂尔多斯盆地北部气田固井工程一直受到下古生界地层固井质量差的困扰,在总结已往固井经验的基础上,经过认真调研和大量室内试验研究,选用了DZJ非渗透水泥浆体系,解决了这一难题.DZJ系列水泥浆由降失水剂DZJ-1、膨胀剂DZP、早强剂DZC及分散剂USZ组成,具有失水量小且成膜失水的特点;稠化和凝结过渡时间均很短,稠化时间可调范围大,水泥浆早期强度发展快;水泥浆初凝后可产生微膨胀,利于防止固井后环空发生气侵,气窜;流变性能好,易于达到紊流顶替,提高注水泥顶替效率;体系性能系数值小于3,防窜能力较强.DZJ系列水泥浆在鄂北天然气井的应用中取得了良好的固井质量,下古生界地层的封固质量达到了优良,在2002年的固井中,合格率为100%,优质率达82%,解决了困扰鄂北气田下古生界地层固井质量问题.
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