介绍了改性木质素磺酸盐PQ的合成工艺，评价了PQ对水泥浆稠化时间的影响及在高密度体系中的应用，同时考察了PQ对温度的敏感性。
The compounding technique of PQ was described and its influences to cement thickening time and application in high density cement system were evaluated, as well as its temperature sensitivity.
木纸浆废料和亚硫酸盐制纸时的副产品。木质素磺酸盐用作钻井泥浆的有机添加剂，如降滤失剂、稀释剂以及页岩抑制剂。
A byproduct of wood-pulp waste and sulfite paper manufacturing that is used as an organic drilling-mud additive for fluid-loss control, as a thinner, and for shale inhibition.
结果表明，不论在淡水泥浆还是盐水泥浆中，改性腐殖酸的稀释效果都比铁铬木质素磺酸盐要好，是一种比较理想的钻井泥浆稀释剂。
It shows the thinner of modified humic acid to be better than Fe_Cr lignosulphonates. It is a ideal thinner for drilling mud.
结果表明，不论在淡水泥浆还是盐水泥浆中，改性腐殖酸的稀释效果都比铁铬木质素磺酸盐要好，是一种比较理想的钻井泥浆稀释剂。
It shows the thinner of modified humic acid to be better than Fe_Cr lignosulphonates. It is a ideal thinner for drilling mud.
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