铝酸三钙和石膏协同对油井水泥浆性能的影响  

Synergistic Effects of Tricalcium Aluminate and Gypsum on Performance of Oil Well Cement Slurries

作　　者：代丹[1] 王义昕 邹亦玮 孙超[1] 马英 宋鑫君 DAI Dan;WANG Yixin;ZOU Yiwei;SUN Chao;MA Ying;SONG Xinjun(COSL Oilfield Chemical Research Institute,Yanjiao,Hebei 065201;College of Materials Science and Engineering,Nanjing Tech University,Nanjing,Jiangsu 211816;Jiangxi Province Building Materials Research and Design Institute Co.,Nanchang,Jiangxi 330001)

机构地区：[1]中海油田服务股份有限公司油田化学研究所,河北燕郊065201 [2]南京工业大学材料科学与工程学院,南京211816 [3]江西省建材科研设计院有限公司,南昌330001

出　　处：《钻井液与完井液》2025年第2期255-261,共7页Drilling Fluid & Completion Fluid

基　　金：中海油服揭榜挂帅项目“海水基固井关键外加剂的开发与机理研究”(YHB23YF004)。

摘　　要：为促进油井水泥质量控制,采用不同铝酸三钙(C_(3)A)含量的G级油井水泥熟料与不同种类石膏匹配,研究了在80℃下油井水泥中C_(3)A与石膏协同对水泥浆凝结时间、稠化性能、抗压强度、渗透率和水化产物的影响。结果表明,80℃下,水泥中C_(3)A含量越高,凝结和稠化时间越短,高C_(3)A含量有利于水泥石早期强度提升,但会导致后期强度倒缩,油井水泥中C_(3)A含量宜严格控制在3%以内。石膏促进水泥浆的凝结时间,其作用效果为二水石膏>半水石膏>无水石膏,相比于无水和半水石膏,二水石膏使掺有缓凝剂H42L的水泥浆稠化时间更长,且更有利于水泥石抗压强度的发展。80℃下,C_(3)A和二水石膏协同对早期硅酸钙矿相水化具有促进作用,C_(3)A相水化主要生成C_(3)AH_(6),其生成量与C_(3)A含量和石膏种类密切相关。该研究结果对油井水泥质量稳定性控制和改善固井质量具有重要的理论和参考意义。To better control the quality of oil well cement,class G cement clinkers with different contents of tricalcium aluminate(C_(3)A)were mixed with different kinds of gypsums,and study was conducted on the synergistic effects of C_(3)A and gypsum on the gelling time,thickening property,compressive strength,permeability and hydration products of the cement at 80℃.It was found that at this temperature,the higher the C_(3)A content,the shorter the gelling time and thickening time of the cement.High C_(3)A content is beneficial to the enhancement of the early strength of the set cement,the disadvantage of this is that the strength of the set cement in later stage will have a negative growth.To avoid this deficiency,the C_(3)A content in a cement should be controlled to less than 3%.Gypsum in the cement helps extend the gelling time of the cement,in this way the dihydrate gypsum is better than bassanite,and bassanite is in turn better than anhydrite.Compared with bassanite and anhydrite,dihydrate gypsum can extend the thickening time of the H42L(a retarder)treated cement slurry much longer,and the use of dihydrate gypsum is much more beneficial to the development of the compressive strength of set cement.At 80℃,the synergistic action between C_(3)A and dihydrate gypsum promoted the hydration of calcium silicate’s early stage mineral phase,the hydration product of C_(3)A was mainly C_(3)AH_(6),the amount of which produced was closely related to the content of C_(3)A in the cement and the types of gypsum.The results of this study are of theoretical and referential importance to the control of the quality stability of oil well cement and to the quality improvement of well cementing operation.

关 键 词：G级油井水泥 C_(3)A 石膏 稠化性能 抗压强度 

分 类 号：TE256[石油与天然气工程—油气井工程]