有机膦酸盐缓凝剂异常增稠油井水泥浆作用机理  

Mechanisms of Organic Phosphonate Retarders to Abnormally Thicken Oil Well Cement

作　　者：邹亦玮 代丹 王义昕 耿晨梓 朱思佳 姚晓[2] ZOU Yiwei;DAI Dan;WANG Yixin;GENG Chenzi;ZHU Sijia;YAO Xiao(Cosl Oilfield Chemical Research Institute,Yanjiao,Hebei 065201;College of Materials Science and Engineering,Nanjing Tech University,Nanjing,Jiangsu 211816)

机构地区：[1]中海油服油田化学研究院,河北燕郊065201 [2]南京工业大学材料科学与工程学院,南京211816

出　　处：《钻井液与完井液》2025年第1期110-116,共7页Drilling Fluid & Completion Fluid

基　　金：中海油田服务有限公司项目“海水基固井关键外加剂的开发与机理研究”(YHB23YF004)。

摘　　要：有机膦酸盐是延长油井水泥浆中高温稠化时间的常用缓凝剂。通过讨论乙二胺四亚甲基膦酸钠(EDTMPS)缓凝剂对G级高抗硫(HSR)油井水泥浆稠化性能的影响,研究了EDTMPS掺量对4种不同厂家水泥稠化性能的影响。使用水化热、XRD和溶解度实验研究了EDTMPS缓凝剂在不同厂家油井水泥浆中的作用机理。结果表明,EDTMPS缓凝剂抑制了二水石膏的溶解,同时促进了C_(3)A溶解。失去二水石膏缓凝作用的C_(3)A快速水化,导致水泥浆初始稠度上升;而EDTMPS缓凝剂促进了半水石膏溶解,释放的SO_(4)^(2-)延缓了C_(3)A的水化作用。通过调整G级HSR油井水泥中C_(3)A和二水石膏/半水石膏的含量匹配关系,可以改善水泥与EDTMPS缓凝剂的配伍性。Organic phosphonates are generally used as retarders for cement slurries at high temperatures in Yanchang oilfield.This paper discusses the effects of the retarder sodium ethylene-diamine tetramethylene-phosphonate(EDTMPS)on the thickening performance of the class G high-sulfur-resistant(HSR)oil-well cements from four different manufacturers.The mechanisms of EDTMPS in retarding the thickening time of the four cement slurries were investigated through hydration heat measurement,XRD experiment and solubility measurement.The results of the measurement and experiment show that in the reactions of EDTMPS with the cements,EDTMPS inhibits the solution of dihydrate gypsum and accelerates the solution of C_(3)A,thus the retarding effect of dihydrate gypsum is inhibited and C_(3)A becomes fast hydrated,leading to an increase in the initial consistency of the cement slurry.On the other hand,EDTMPS can accelerate the solution of hemihydrate gypsum which releases SO_(4)^(2-).The SO_(4)^(2-)ions released slow down the hydration process of C_(3)A.By adjusting the concentrations of C_(3)A,dihydrate gypsum and hemihydrate gypsum in the class G HSR oil-well cement slurry,the compatibility of the cement slurry with EDTMPS can be improved.

关 键 词：油井水泥 高温 有机膦酸盐 稠化性能 微观结构 

分 类 号：TE256[石油与天然气工程—油气井工程]