A High-strength Elastic-tough Cement Slurry System and Its Application in Coalbed Methane Horizontal Well Cementing
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摘要: 煤层气水平井固井对水泥石的强度和弹韧性要求较高。通过合成一种外刚内弹的核壳结构聚合物微球材料TRF作为弹韧性外加剂，研发了一套高强弹韧性水泥浆体系。研究表明，该水泥浆体系48 h抗折强度提高75%，抗压强度下降8.8%，弹性模量降低38%；抗冲击性能对比其他增韧剂体系表现良好，14 d静载抗压强度、动态强度、吸收能分别提高96.12%、115.16%、355.87%；胶结性能好，I界面的胶结强度提升29.4%，Ⅱ界面强度提升43.1%；防窜性能出色，孔隙压力曲线下降平滑，无回弹，静胶凝曲线过渡时间短，只有5.5 min，缩短了82%。该水泥浆体系在拜城煤层气区块的拜Z15-L1井现场成功应用，水平井段固井质量优异，对比邻井的一二界面胶结质量提升明显。该高强弹韧性水泥浆体系能满足煤层气水平井固井要求。Abstract: Coalbed methane horizontal well cementing requires the cement stone to possess not only high strength but also good elasticity and toughness. A high-strength elastic-tough cement slurry system was developed by synthesizing a polymer microsphere material TRF with a core-shell structure, which was rigid outside and elastic inside, as an elastic-tough additive. The research results showed that this cement slurry system had a 75% increase in flexural strength, an 8.8% decrease in compressive strength, and a 38% reduction in elastic modulus after 48 h. It exhibited superior impact resistance performance to other toughening agent systems. After 14 days, the static compressive strength, dynamic strength, and absorption energy were increased by 96.12%, 115.16%, and 355.87%, respectively. The bonding performance was good, with a 29.4% increase in bonding strength at interface I and a 43.1% increase at interface Ⅱ. The anti-channeling performance was excellent. The pore pressure curve decreased smoothly without rebound, and the transition time of the static gel curve was short (only 5.5 min), representing an 82% reduction. This cement slurry system was successfully applied in Well BaiZ15-L1 in the Baicheng coalbed methane block, achieving excellent cementing quality in the horizontal well section, with bonding quality enhanced markedly at interfaces I and Ⅱ in comparison with offset wells. This high-strength elastic-tough cement slurry system met the requirements for coalbed methane horizontal well cementing.
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Key words:
- Elastic-tough material /
- Core-shell structure /
- Well cementing /
- Cement slurry /
- Coalbed methane /
- Horizontal well
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表 1 弹韧性水泥浆的基本性能
TRF/
%ρ/
g·cm-3流动度/
cm析水/
mLFLAPI/
mL△ρ/
g·cm-3稠化时间
(85 ℃, 56 MPa,
60 min)/min0 1.85 23 0 48 0 210 5 1.85 22 0 46 0 227 10 1.86 22 0 32 0 223 15 1.87 22 0 30 0.01 230 
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表 2 弹韧性水泥石的力学性能
TRF/
%抗压强度/
MPa抗折强度/
MPa弹性模量/
GPa0 30.6 3.6 9.46 5 27.9 6.3 5.91 10 21.9 5.5 4.71 15 20.2 3.8 3.12
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表 3 添加不同增韧剂的水泥石抗压强度及动态力学性能对比
序号 增韧剂 T/
℃静载抗压
强度/MPa动态强度/
MPa吸收能/
J空白 无 60 20.60 22.36 14.73 TRF TRF 60 40.40 48.11 67.15 对比1 丁腈橡胶粉 60 35.42 29.52 36.48 对比2 纤维素纤维 60 38.31 41.26 64.17 对比3 丁苯乳胶 60 32.90 36.36 48.68 对比4 硅橡胶粉 60 25.00 32.35 41.03 对比5 聚酯纤维 60 28.80 35.07 43.10
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