油井用复合低温早强剂的制备与性能研究  

Preparation and Properties of Compound Low Temperature and Early Strength Agent for Oil Well

作　　者：刘和兴 王成龙 刘智勤 张磊 毛宇航 彭志刚[2] LIU He-xing;WANG Cheng-long;LIU Zhi-qin;ZHANG-Lei;MAO Yu-hang;PENG Zhi-gang(Zhanjiang Branch of CNOOC China Co.,Ltd.,Zhanjiang 524000,China;College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu 610000,China)

机构地区：[1]中海石油(中国)有限公司湛江分公司,广东湛江524000 [2]西南石油大学化学化工学院,四川成都610000

出　　处：《合成化学》2021年第10期830-836,共7页Chinese Journal of Synthetic Chemistry

基　　金：中海石油陵水25-1区块开发井固井水泥浆体系选择及配套工艺(CCL2019ZJFN1230)。

摘　　要：针对低温环境导致水泥浆强度发展缓慢难题,本文合成了C-S-H早强晶种,并将其与Li_(2) CO_(3)、Na_(2)SO_(4)、NaAlO_(2)共混制备了一种适用于深水低温环境的油井水泥早强剂。首先,采用FT-IR、XRD、EDS与SEM分析了C-S-H早强晶种的化学组成、结构与微观形貌;其次,对复合低温早强剂的早强性能进行了研究。结果表明:5℃下,低温早强剂早强效果显著,将水泥石8 h、12 h、24 h的抗压强度由0 MPa提升至0.6、0.8、1.4 MPa。早强机理分析结果表明:低温早强剂中的C-S-H早强晶种的成核作用与Na_(2)SO_(4)、NaAlO_(2)、Li_(2) CO_(3)共同作用,加速了水化诱导期水化颗粒表面不渗透膜的破裂,使水泥浆水化诱导期提前结束进入加速阶段,从而提高低温下水泥石的早期抗压强度。Aiming at the slow development of cement slurry strength caused by a low-temperature environment, we prepared C-S-H early-strength seeds and prepared a kind of early strength agent for oil well cement suitable for deepwater and low-temperature environment with Li_(2) CO_(3) , Na_(2)SO_(4) , and NaAlO_(2) as raw materials. First, FT-IR, XRD, EDS, and SEM were used to analyze the chemical composition, structure, and micro-morphology of C-S-H early-strength seed;secondly, the early-strength performance of the composite low-temperature early-strength agent was studied. The results showed the low-temperature early-strength agent has a significant early-strength effect at 5 ℃, increasing the compressive strength of the 8 h, 12 h, and 24 h cement stone from 0 MPa to 0.6, 0.8, and 1.4 MPa, respectively. Finally, SEM and XRD were used to analyze the early-strength mechanism of the low-temperature early-strength agent. The results showed that the nucleation of the C-S-H early-strength seeds in the low-temperature early-strength agent and Na_(2)SO_(4) , NaAlO_(2) , Li_(2) CO_(3) worked together to accelerate the hydration in the induction period of hydration. The rupture of the impermeable membrane on the surface of the particles causes the cement slurry hydration induction period to end early and enters the acceleration stage, thereby improving the early compressive strength of the cement stone at low temperatures.

关 键 词：深水固井 低温早强剂 抗压强度 早强机理 制备 成核作用 性能 

分 类 号：O6[理学—化学] TE256[石油与天然气工程—油气井工程]