油页岩原位开采区注浆封闭浆液优化及其防渗效果实验

为提高油页岩原位转化加热效率、减少油气污染，采用注浆技术对油页岩开采区进行封闭止水。基于扶余油页岩开采区地质条件，对优化封闭浆液配方与封闭效果进行实验研究。首先基于正交试验，获得了不同指标下的优化配方，进而通过综合分析法，选出符合此封闭区要求的优化配方；为了验证优化浆液的封闭效果，对比分析了浆液充填前后油页岩试样渗透率的变化。结果表明：浆液优化配方为水灰质量比0.85，w（钠基膨润土）4.0%、w（微硅粉）6.0%、w（聚羧酸减水剂）0.5%；当围压为扶余油页岩开采区地应力时，充填浆液试样的渗透率均约为0.1×10^-3 μm²，远低于未充填的试样，优化浆液封堵试样裂缝效果较好。

Experiment on the Optimization of Grouting Sealing Slurry and Its Anti-Seepage Effect in Oil Shale In-Situ Production Area

To improve the transformation efficiency of oil shale in-situ exploration and reduce the pollution of pyrolysis products, a method of sealing production areas,namely grouting technology, is introduced. Taking the geological conditions of Fuyu oil shale as an example, the optimum formulation of grout and its sealing effect in oil shale production area are determined. Based on the orthogonal test, the viscosity of grout is set as the main evaluation index, and the optimized formula of grout is water cement ratio of 0.85, sodium bentonite of 4.0%, silica powder of 6.0%, and poly-carboxylic acid super-plasticizer of 0.5%. In order to verify the sealing effect of the optimized grout, the permeability changes of the oil shale samples filled or not filled with the grout were compared and analyzed. When the confining pressure is equal to the in-situ stress of Fuyu oil shale, the permeability of all filling grouts samples is all about 0.1×10^-3 μm², which is much lower than that of the samples without the grout, indicating that the optimized grout can seal the fractures successfully.