Study and Application of a Fly Ash-slag Bonding Reinforcement Material
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摘要: 为解决固井低密度水泥浆体系早期强度低、与水泥配伍有偏差以及成本高等问题，以粉煤灰、矿渣为研究对象，使用 XRF、XRD、SEM等检测手段对原材料的化学成分、比表面积及微观形貌进行表征，得出粉煤灰、矿渣颗粒级配分布密集的区域为0.36～89.34、1.56～39.91 μm，比表面积为0.822、1.790 m2/g，且呈现出光滑且密集堆积的现象。通过对增强材料作用机理分析研究，以粉煤灰水泥浆体系的抗压强度为首要技术指标，优选出无机、有机增强材料，并完成各组分配比分析研究，确定增添材料的最优化加量，形成35%KZ+8%FMH+8%WK+3%NY+2%NS+6%CS的增强材料，制备了碱激发粉煤灰矿渣复合胶凝材料，研究了碱激发粉煤灰-矿渣复合胶凝增强材料在QZ、FMH水泥浆体系不同加量的反应进程、微观结构以及抗压强度的变化规律，评价综合性能，当QZ、FMH水泥浆增强材料加量至10%、9%时，其性能达到应用要求。初步现场应用7井次，固井封固井段合格率为100%，固井质量结果达到预期目标，增强材料应用效果良好。Abstract: When using a low-density cement slurry to cement a well, several problems need to be addressed, such as low early strength, deviation in compatibility with cement and high operation cost. To solve these problems, studies were conducted on fly ash and slag for their chemical composition, specific surface area and micromorphology using XRF, XRD and SEM etc. The study results have shown that the particle sizes of the fly ash and slag are distributed mainly in ranges of 0.36 – 89.34 μm and 1.56 – 39.91 μm, respectively, the specific surface area of the fly ash and the slag is 0.822 m2/g and 1.79 m2/g, respectively. The particles of these two materials have smooth surfaces and are closely packed. By analyzing the working mechanisms of the reinforcement materials, some organic and inorganic reinforcement materials were selected, taking the compressive strength of the flay ash cement slurry as the primary technical indicator. The optimum ratios and concentrations of these materials in the final reinforcement material were determined through laboratory studies as follows: 35%KZ+8%FMH+ 8%WK+3%NY+2%NS+6%CS. An alkali-activated fly ash-slag compound bonding reinforcement material was developed. The reaction process, micro structure and compressive strength of the alkali-activated fly ash-slag compound bonding reinforcement material in the QZ and FMH cement slurries were studied. Evaluation of the general performance of the bonding reinforcement material showed that when the concentrations of the bonding e reinforcement material in these two cement slurries are 10% and 9% respectively, the property of the cement slurries is able to meet the requirements of field operations. The bonding reinforcement material has been used in 7 well/times and the well cementing quality was 100% certified, achieving the expected goals.
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Key words:
- Fly ash /
- Slag /
- Reinforcement material /
- Compressive strength /
- Application effect
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表 1 用X荧光光谱仪分析物质化学成分(%)
物质 CaO SiO2 Fe2O3 Al2O3 MgO SO3 其他组分 G级水泥 67.59 18.05 5.75 2.67 1.63 2.34 1.97 粉煤灰 10.30 47.96 8.82 20.88 2.57 3.16 6.31 矿渣 45.21 28.56 0.53 14.14 7.10 2.17 2.29 
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表 2 粉煤灰和矿渣的钙硅比
物质 CaO/SiO2 SiO2/Al2O3 Ca/Si Si/Al 粉煤灰 0.21 6.76 0.30 6.37 矿渣 1.58 2.02 2.26 1.74
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表 3 增强材料组分筛选
配方 增强材料组分 p24 h/MPa p48 h/MPa 空白 5.5 9.2 ZQ1 KZ+FMH+CS+WK+AS 6.2 10.1 ZQ2 KZ+FMH+CS+WK+NS+NSO 7.3 11.0 ZQ3 KZ+FMH+CS+WK+NY+QS 8.6 13.2 ZQ4 KZ+FMH+CS+WK+NS+KY 7.5 11.8 ZQ5 KZ+FMH+CS+WK+NS+NY 9.2 14.5 注：空白基础配方为40%G级水泥+9%ZQ+50%FMH+4%GJ-K，W/C=0.80。
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表 4 增强材料优化组分配比
配方 FMH/% KZ/% WK/% NY/% CS/% NS/% ZH1 10 30 5 4 5 2 ZH2 5 40 6 3 5 2 ZH3 8 35 8 3 6 2 ZH4 8 35 10 3 6 3 注：基础配方为40%G级水泥+9%ZQ+50%FMH+4%GJ-K，W/C=0.80。
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表 5 低密度水泥浆体系性能参数
水泥浆 ρ/
g·cm−3游离液/
%FL/
mL初始稠度/
Bct稠化/
minp 24 h/
MPap 48 h/
MPaFMH 1.55 0.4 48 19 145 10.2 14.1 QZ 1.33 0.8 65 15 193 7.1 12.6 注：失水实验条件为30 min、7 MPa；稠化实验条件为75 ℃、35 MPa；抗压强度实验条件为45 ℃；水灰比为0.80。
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表 6 试验井固井质量统计表
井号 封固井
段/m合格率/
%井号 封固井
段/m合格率/
%苏东
42-X4500～
270099.38 苏36-
23-X2300～
285090.23 苏东
27-X3525～
275094.71 郭X 2227～
260599.80 苏东
22-X550～
260099.41 盐37-X 1000～
120098.75 苏14-
17-X800～
300097.07
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