Experimental Study on Secondary-hydration Self-healing Performance of Microcracks in Wellbore Cement Sheaths
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摘要: 固井水泥环密封完整性直接关系到油气井服役安全与寿命,复杂工况易引发微裂缝,早期未修复将导致腐蚀性流体侵入、套管劣化等风险,现有研究忽视短期修复与流变性能。以G级高抗油井水泥为基体,选取6种浅活性材料为二次水化型自愈合剂,经单掺筛选与复合体系构建,从流变性能、抗压强度及渗透率3个方面探究短期3 d、7 d的自愈合效果。结果表明,单掺体系中10%硅粉与1%硅酸钠修复性能最优,养护7 d强度恢复率分别达70.6%和78.5%;复合体系呈显著协同作用,20%粉煤灰+1%硅酸钠综合性能最佳,养护7 d强度恢复率为72.37%、渗透率降低率为60.69%,成本更低且施工稳定。研发的自愈合剂破解了传统材料“反应慢、成本高”的瓶颈,为油气井早期井筒修复提供支撑,对保障井筒完整性、降本增效具有重要工程意义。Abstract: The sealing integrity of cement sheaths in well cementing is directly related to the operational safety and service life of oil and gas wells. However, complex service conditions can readily induce microcracks, which, if not repaired at an early stage, may lead to corrosive fluid invasion, casing deterioration, and other risks. Existing studies have paid insufficient attention to short-term repair performance and rheological properties. In this paper, Class G high-sulfate-resistant oil well cement was used as the base material, and six latent reactive materials were selected as secondary-hydration self-healing agents. Through single-additive screening and the construction of composite systems, the short-term self-healing effects after 3 and 7 days of curing were investigated in terms of rheological properties, compressive strength, and permeability. The results show that among the single-additive systems, 10% silica fume and 1% sodium silicate exhibit the best repair performance, with strength recovery rates reaching 70.6% and 78.5%, respectively, after 7 d of curing. The composite systems exhibit a significant synergistic effect. Among them, the system containing 20% fly ash and 1% sodium silicate exhibits the best overall performance, with a strength recovery rate of 72.37% and a permeability reduction rate of 60.69% after 7 d of curing, while also offering lower cost and good field applicability. The developed self-healing agent overcomes the limitations of traditional materials, such as slow reaction and high cost, and provides technical support for early-stage wellbore repair in oil and gas wells. It is of great engineering significance for ensuring wellbore integrity, reducing costs, and improving efficiency.
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Key words:
- Well cement /
- Microcrack /
- Crystalline-precipitation self-healing agent
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表 1 单一浅活性材料流变性能表
浅活性材料 t稠化/min
(80 ℃)φ600/φ300/φ200/
φ100/φ6/φ3PV/
mPa·sYP/
Pa纯水泥 183 105/54/35/17/2/1 51 1.5 5%偏高岭土 214 137/68/45/22/1/0.5 69 0.5 7%偏高岭土 217 124/62/37/20/2/1 62 0 9%偏高岭土 216 110/58/39/19/1/0.5 52 3.0 5%硅粉 215 172/96/65/32/1.5/0.5 76 10.0 10%硅粉 195 249/134/92/47/2/1 115 9.5 15%硅粉 203 224/118/80/42/3/1 106 6.0 10%粉煤灰 205 176/91/60/29/2/1 85 3.0 15%粉煤灰 213 179/94/61/31/2/1 85 4.5 20%粉煤灰 220 181/96/63/32/2/1 85 5.5 10%矿渣 172 131/73/55/31/3/1 58 7.7 15%矿渣 170 136/77/59/40/38/27 59 9.2 20%矿渣 163 143/75/52/29/5/1 68 3.6 3%氧化镁 162/85/56/27/1.5/0.5 77 4.1 5%氧化镁 175/89/61/29/2/1 86 1.5 10%氧化镁 191/99/67/33/3/1 92 3.6 1%硅酸钠 26 140/69/45/22/1/0.5 71 1.0 3%硅酸钠 169/107/75/60/45/32 62 23.0 5%硅酸钠 154/79/55/32/7/2 75 2.0 表 2 复合硅粉+偏高岭土体系流变性能
偏高
岭土/%硅粉/
%t稠化/min
(80 ℃)φ600/φ300/φ200/
φ100/φ6/φ3PV/
mPa·sYP/
Pa0 0 183 105/54/35/17/2/1 51 1.5 5 10 186 178/93/67/31/2/0.5 85 4.1 10 10 175 192/98/67/34/2/1 94 2.0 15 10 172 210/107/72/38/3/1 103 2.0 20 10 115 220/118/84/45/5/3 102 8.2 25 10 90 224/123/90/46/4/3 101 11.2 表 3 复合硅酸钠+粉煤灰体系流变性能表
硅酸
钠/%粉煤
灰/%t稠化/min
(80 ℃)φ600/φ300/φ200/
φ100/φ6/φ3PV/
mPa·sYP/
Pa0 0 183 105/54/35/17/2/1 51 1.5 0.1 20 195 175/95/71/44/5/3 80 7.7 0.4 20 177 169/97/72/46/22/6 72 12.8 0.7 20 165 217/106/69/45/6/3 111 2.6 1.0 20 147 235/120/82/41/3/1 115 2.6 3.0 20 295/185/152/121/50/11 110 38.3 -
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