Early Hydration Process of Well Cement Slurries for Cementing CO2-Contained Gas Reservoirs and Factors Affecting the Performance of the Cement Slurries
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摘要: 在含CO2气藏固井施工中，固井水泥浆与CO2的接触不可避免。CO2接触时间的变化可能会影响水泥早期水化特性及微观结构的发展，严重时甚至可能影响固井质量。该研究通过控制CO2通气时间，系统地考察了水泥早期水化特性及其力学性能与渗透率的变化规律。并采用XRD、TG和SEM等手段分析了水泥早期物相组成及微观结构演变规律。研究表明，随CO2通气时间增加，浆体流动性在初期得到改善后逐渐下降，而凝结时间持续缩短。水化放热曲线显示，CO2处理显著加快了水泥水化进程，并提高了早期累积放热量。然而，随通气时间延长，效果逐渐减弱。抗压强度及渗透率测试结果表明，CO2处理显著提升了水泥早期强度，尤其在通气时间不大于3 min时效果最佳，但随着通气时间的延长，强度和渗透率逐渐下降。XRD、TG及SEM分析表明，CO2处理增加了CaCO3的生成，破坏了Ca(OH)2和C—S—H凝胶组成的包覆结构，加速了水泥颗粒的水化进程。Abstract: In cementing a gas well with CO2 contained in the reservoir, it is inevitable for the cement slurries to contact with the CO2. The length of the contact time will possibly affect the early hydration characteristics and the development of the microstructure of the cement slurries, and worse still is the negative effects of this contact on the quality of well cementing. In this study, the change patterns of the early hydration characteristics, the mechanical properties and the permeability of a cement slurry were systematically investigated by controlling the ventilation time of CO2. Using XRD, TG and SEM etc., the early phase composition and the evolution pattern of the cement slurry were analyzed. The study showed that the fluidity of the cement slurry was improved in the early stage and was then deteriorating with the time of CO2 ventilation. The setting time of the slurry, on the other hand, was shortened continuously. The hydration heat release curve showed that CO2 treatment significantly accelerated the cement hydration process, and increased the early cumulative released heat. However, as the time of CO2 ventilation increased, these effects became weakening. Compressive strength and permeability test results showed that CO2 treatment significantly enhanced the early strength of the cement slurry, and the best result can be obtained at ventilation time of less than 3 minutes. However, as the ventilation time of CO2 increased, the strength and permeability of the set cement both gradually decreased. XRD, TG and SEM analyses showed that CO2 treatment increased the formation of CaCO3, disrupted the coating structures formed by Ca(OH)2 and the C—S—H gel, and hence accelerated the hydration process of the cement particles.
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Key words:
- Gas reservoir with CO2 /
- Well cementing /
- Cement slurry /
- Early hydration /
- Accelerated hydration
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[1] 范劲, 郭艳, 李茂森, 等. 四川盆地抗CO2污染高密度水基钻井液[J]. 天然气勘探与开发, 2024, 47(4): 99-105.FAN Jin, GUO Yan, LI Maosen, et al. High-density water-based drilling fluid with resistance to CO2 contamination and its application to Sichuan Basin[J]. Natural Gas Exploration and Development, 2024, 47(4): 99-105. [2] 李文涛. 四川页岩气井碳酸根/碳酸氢根污染问题的处理实践[J]. 钻井液与完井液, 2022, 39(1): 53-58.LI Wentao. Study and treatment on carbonate/bicarbonate pollution in shale gas wells in Sichuan[J]. Drilling Fluid & Completion Fluid, 2022, 39(1): 53-58. [3] 刘天恩, 贺彦亮, 靳盛, 等. 防H2S和CO2酸性气体腐蚀水泥浆体系研究与应用[J]. 钻井液与完井液, 2014, 31(4): 68-70.LIU Tianen, HE Yanliang, JIN Sheng, et al. Research and application of anti-H2S and CO2 acid gas corrosion cement slurry system[J]. Drilling Fluid & Completion Fluid, 2014, 31(4): 68-70. [4] KASHEF-HAGHIGHI S, SHAO Y X, GHOSHAL S. Mathematical modeling of CO2 uptake by concrete during accelerated carbonation curing[J]. Cement and Concrete Research, 2015, 67: 1-10. doi: 10.1016/j.cemconres.2014.07.020 [5] CHEN T F, BAI M J, GAO X J. Carbonation curing of cement mortars incorporating carbonated fly ash for performance improvement and CO2 sequestration[J]. Journal of CO2 Utilization, 2021, 51: 101633. doi: 10.1016/j.jcou.2021.101633 [6] LIPPIATT N, LING T C. Rapid hydration mechanism of carbonic acid and cement[J]. Journal of Building Engineering, 2020, 31: 101357. doi: 10.1016/j.jobe.2020.101357 [7] LIU L L, JI Y S, GAO F R, et al. Study on high-efficiency CO2 absorption by fresh cement paste[J]. Construction and Building Materials, 2021, 270: 121364. doi: 10.1016/j.conbuildmat.2020.121364 [8] CAI Y, LIU M, LI M, et al. Study on the properties and eco-sustainability of early-age carbonation cured cement paste with recycled concrete slurry waste substitution[J]. Case Studies in Construction Materials, 2024, 21: e03862. doi: 10.1016/j.cscm.2024.e03862 [9] YIN K, SHEN P, ZHANG L, et al. Carbonized seawater cement slurries for offshore deep cement mixing: carbonation mechanism, strength enhancement and microstructure evolution[J]. Cement & Concrete Composites, 2024, 154: 105788. [10] CUI K, LAU D, ZHANG Y Y, et al. Mechanical properties and mechanism of nano-CaCO3 enhanced sulphoaluminate cement-based reactive powder concrete[J]. Construction and Building Materials, 2021, 309: 125099. doi: 10.1016/j.conbuildmat.2021.125099 [11] YANG J, PIAO R Z, ZHU C H, et al. Carbonation mechanism and cementation properties of recycled cement paste based on CO2 injection time and pressure[J]. Construction and Building Materials, 2024, 447: 138104. doi: 10.1016/j.conbuildmat.2024.138104 [12] MONKMAN S, LEE B E J, GRANDFIELD K, et al. The impacts of in-situ carbonate seeding on the early hydration of tricalcium silicate[J]. Cement and Concrete Research, 2020, 136: 106179. doi: 10.1016/j.cemconres.2020.106179 [13] MA M T, MEHDIZADEH H, GUO M Z, et al. Effect of direct carbonation routes of basic oxygen furnace slag (BOFS) on strength and hydration of blended cement paste[J]. Construction and Building Materials, 2021, 304: 124628. doi: 10.1016/j.conbuildmat.2021.124628 [14] JIANG Y, LING T C. Production of artificial aggregates from steel-making slag: Influences of accelerated carbonation during granulation and/or post-curing[J]. Journal of CO2 Utilization, 2020, 36: 135-144. doi: 10.1016/j.jcou.2019.11.009 [15] SCHERB S, MAIER M, BEUNTNER N, et al. Reaction kinetics during early hydration of calcined phyllosilicates in clinker-free model systems[J]. Cement and Concrete Research, 2021, 143: 106382. doi: 10.1016/j.cemconres.2021.106382 -
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