-18℃下冻土区负温水泥浆水化微观过程研究
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摘要
极地冷海地区具有重要的油气勘探开发价值,但常规固井水泥浆液相水分在该地区负温环境下会分凝结冰,水化反应无法进行,导致固井工作难以开展。为此,针对极地冷海冻土区负温环境下固井水泥浆不凝固难题开发了一种负温水泥浆体系,并对比研究了其在-18℃和室温环境下水化反应微观产物的区别。实验结果表明:该体系具有优良的负温固化性能,在-18℃下0.5～3 h内固化,24 h抗压强度达3.5～9 MPa,可有效解决负温条件下常规水泥浆不固化无强度难题;微观成分测试发现,-18℃下冻土区负温水泥浆的水化程度较室温下低,但水化产物中Aft含量较室温下高,这对水泥石的机械性能起到了积极作用。
The cold sea area in polar region of the earth possess huge reserves of oil and gas, cementing of the wells developing these oil and gas is not able to be completed using conventional cement slurries because the water in the cement slurry gets frozen in cold temperatures in polar region, and the hydration of cement is unable to proceed. A cement slurry has recently been developed for use in this cold area, and the products of hydration at-18 ℃ and at room temperature were compared microscopically. Laboratory experimental results showed that the cement slurry developed has excellent setting performance at cold temperatures; at-18 ℃, the cement slurry sets in 0.5-3 h, and the 24 h compressive strength falls between 3.5 and 9 MPa, indicating that the cement slurry can be used to resolve the problems conventional cement slurries have to face with: being unable to set and having no strength at cold temperatures. Microscopic test of the cement slurry shoed that the hydration degree of the cement slurry at-18 ℃ is lower than that of the cement slurry at room temperature, while the Aft content of the cement slurry at-18 ℃ is higher than that of the cement slurry at room temperature, a phenomenon that is positive to the mechanical properties of the set cement.
The cold sea area in polar region of the earth possess huge reserves of oil and gas, cementing of the wells developing these oil and gas is not able to be completed using conventional cement slurries because the water in the cement slurry gets frozen in cold temperatures in polar region, and the hydration of cement is unable to proceed. A cement slurry has recently been developed for use in this cold area, and the products of hydration at-18 ℃ and at room temperature were compared microscopically. Laboratory experimental results showed that the cement slurry developed has excellent setting performance at cold temperatures; at-18 ℃, the cement slurry sets in 0.5-3 h, and the 24 h compressive strength falls between 3.5 and 9 MPa, indicating that the cement slurry can be used to resolve the problems conventional cement slurries have to face with: being unable to set and having no strength at cold temperatures. Microscopic test of the cement slurry shoed that the hydration degree of the cement slurry at-18 ℃ is lower than that of the cement slurry at room temperature, while the Aft content of the cement slurry at-18 ℃ is higher than that of the cement slurry at room temperature, a phenomenon that is positive to the mechanical properties of the set cement.
引文
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[2]王瑞和,王成文,步玉环,等.深水固井技术研究进展[J].中国石油大学学报,2008,32(1):77-81.WANG Ruihe,Chengwen,BU Yuhuan,et al.Research development of deepwaterTechnique[J].Journal of China University of Petroleum,2008,32(1):77-81.
[3] И И Белей,Л М Каргапольцева. Новый порошкообразный расширяющийся тампонажный материал для низких температур[ J ] . Троительство нефтяных и газовых скважин на суше и на море,2007(в):33-37.
[4]LOTHEN BACH B,MATSCHEI T,MOSCHNERG,et al.Thermody-namic modeling of the effect of temperature on the hydration and porosity of Portland cement[J].Cem Concr Res,2008,38(1):1-8.
[5]ESCALANTE-GARCIA J I,SHARP J H.Variation in the composition of C-S-H gel in Portland cement pastes cured at various temperatures[J].J Am Ceram Soc,1999,82(11):3237-3243.
[6]THOMAS J J,ROTHSTEIN D,JENNINGS H M,et al.Effect of hydration temperature on the solubility behavior of Ca-,S-,Al-,and Si-bearing solid phases in Portland cement pastes[J].Cem Concr Res,2003,33(12):2037-2042.
[7]徐玲琳,李楠,王培铭,等.温度对铝酸盐水泥基三元体系早期水化的影响[J].硅酸盐学报,2016,44(11):1152-1157.XU Linglin,LI Nan,WANG,et al.Peiming temperature effect on early hydration of calcium aluminate cement based ternary blends[J].Journal of The Chinese Ceramic Society,2016,44(11):1152-1157.
[8]WINNEFELD F,LOTHENBACH B.Hydration of calcium sulfoaluminate cements-experimental findings and thermodynamic modelling[J].Cem Concr Res,2010,40(8):1239-1247.
[9]KWANS,LAROSAJ,GRUTZECKMW.29Si and 27AlMASNMR study of stratlingite[J].J Am Ceram Soc,1995,78(7):1921-1926.
[10]王培铭,徐冷琳,张国防.0-20℃养护下硅酸盐水泥水化时钙矾石的生成及转变[J].硅酸盐学报,2012,40(5):646-650.WANG Peiming,XU Linglin,ZHANG Guofang.Formation and conversion of ettringite during hydration of portland cement from 0 to 20℃[J].Journal of the Chinese Ceramic Society,2012,40(5):646-650.
[11]王玉锁,叶跃忠,钟新樵,等.新型混凝土早强剂的应用研究现状[J].建筑材料,2005(4):105-106.WANG Yusuo,YE Yuezhong,ZHONG Xinyu,et al.Application status of new concrete early strength agent[J].Building Materials,2005(4):105-106.
[12]邓君安,李德栋,李启棣,等.硫铝酸盐早强水泥负温下的水化硬化[J].硅酸盐学报,1983(11):85-94.DENG Junan,LI DEdong,LI Qikai,et al.The hydration and hardening of high early strength sulfoaluminate cement under subzero performance[J].Journal of the Chinese Ceramic Society,1983(11):85-94.