Development of an Anti-Deformation Cement Slurry under Alternative Loading and Its Application in Fuling Shale Gas Wells
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摘要:
针对页岩气井普遍存在的套管环空带压问题,从提高固井水泥环长久密封完整性角度出发,研制了具有钢筋混凝土力学性能的絮状弹韧性材料DeForm,并以其为基础配制了一种适应页岩气井大型分段压裂的抗高交变载荷水泥浆。室内性能评价试验结果表明,该水泥浆具有优良的弹韧性和耐久性,可有效提高水泥环的抗交变载荷能力,实现水泥环与套管的同步形变,保证井筒的长久密封完整性。该水泥浆在涪陵页岩气田9口井进行了现场应用,固井优质率达到88.9%,套管环空带压率为0,效果非常显著,为预防页岩气井套管环空带压提供了新的技术途径。
Abstract:To sustain casing pressure in shale gas wells, a flocculent elastic material DeForm with the function like rebar in concrete was developed with the goal of improving the long-term sealing integrity of the cement sheath. Using DeForm as the basis of its chemical composition, an anti-deformation cement slurry under alternative loading suitable for large scale staged fracturing in shale gas well was prepared. The indoor performance evaluation results demonstrated that the system has excellent elastic toughness and durability, which can effectively improve the ability of cement sheath to resist alternative loading, to bring about synchronous deformation of casing and cement sheath and to ensure the long-term sealing integrity of wellbore. This cement slurry system has been successfully applied in 9 wells in the Fuling Shale Gas Field, with excellent cement job rating 88.9% and no sustained pressure in casing annulus. With such remarkable application results, the cement slurry will provide a new way in preventing sustained casing pressure in shale gas wells.
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Keywords:
- alternative loading /
- cement slurry /
- shale gas well /
- sealing integrity /
- Fuling Shale Gas Field
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表 1 水泥石力学性能测试结果
Table 1 Test results of mechanical property of cement stone
测试项目 测试条件 48 h抗压强度/MPa 弹性模量/GPa 泊松比 弹性模量降低率,% 常规材料 75 ℃×0.1 MPa× 48 h 40.368 8.896 0.208 橡胶粉 38.483 7.282 0.219 18.14 DeForm 34.422 5.425 0.264 39.02 表 2 抗高交变载荷水泥石力学特性试验条件及结果
Table 2 Experimental condition and results of mechanical property of anti-deformation cement stone under alternative loading
DeForm加量,% 围压/MPa 差应力/MPa 弹性模量/GPa 泊松比 2.0 15 67.637 6.461 0.219 2.5 66.434 6.019 0.232 3.0 53.008 5.580 0.275 表 3 抗高交变载荷水泥浆温度敏感性试验结果
Table 3 Test results of temperature sensibility of anti-deformationcement slurry under alternative loading
温度/
℃30 Bc稠化时间/
min100 Bc稠化时间/
min稠化过渡时间/
min80 128 136 8 90 106 116 10 100 90 97 7 表 4 抗高交变载荷水泥浆密度敏感性试验结果
Table 4 Test results of density sensibility of anti-deformationcement slurry under alternative loading
试验温度/
℃密度/
(kg·L–1)30 Bc稠化
时间/min100 Bc稠化
时间/min稠化过渡
时间/min90 1.91 121 127 6 1.88 135 140 5 1.85 148 155 7 表 5 抗高交变载荷水泥浆相容性试验结果
Table 5 Compatibility test results of anti-deformation cement slurry under alternative loading
序号 入井流体占比,% 六速旋转黏度计读数 相容性判定 水泥浆 前置液 油基钻井液 常温 90 ℃ 1 100 >300/298/218/128/14/10 292/190/134/77/9/7 2 100 107/72/58/41/16/13 49/35/28/20/6/5 3 100 >300/194/145/90/22/10 84/53/42/28/10/9 4 90 10 >300/290/208/119/13/9 240/161/106/65/17/11 相容 5 70 30 >300/>300/246/151/26/19 160/100/74/45/8/6 相容 6 50 50 >300/294/225/149/33/25 139/86/65/41/9/6 相容 7 30 70 >300/232/185/125/36/27 85/50/38/24/6/5 相容 8 10 90 233/164/130/90/26/17 57/33/21/15/4/3 相容 9 33 33 34 220/143/109/71/17/13 157/96/78/50/12/9 相容 10 70 20 10 216/127/94/57/8/7 136/89/70/46/7/5 相容 表 6 抗高交变载荷水泥浆现场应用情况
Table 6 Field application of anti-deformation cement slurry under alternative loading
序号 井号 完钻井深/m 水平段长/m 最大垂深/m 固井质量 技术套管压力/MPa 1 焦页A-4HF井 5 825 1 600 3 872 优质 0 2 焦页B-3HF井 5 456 1 312 3 785 优质 0 3 焦页C-6HF井 5 305 2 240 2 808 优质 0 4 焦页D-8HF井 5 458 2 204 2 927 优质 0 5 焦页E-6HF井 5 235 2 387 2 900 合格 0 6 焦页F-S4HF井 4 734 1 928 2 360 优质 0 7 焦页G-5HF井 4 875 1 924 2 592 优质 0 8 焦页H-S1HF井 5 481 2 792 2 444 优质 0 9 焦页G-S5HF井 4 624 1 881 2 522 优质 0 -
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