油页岩原位注浆封闭浆液配方研究

油页岩在原位开采过程中，开采井与周围环境相通，原位产生的油气容易渗入周围地层形成环境污染，目前尚没有一种经济性较好的原位封闭技术来解决该难题。本文基于注浆封闭原理，通过试验探究，提出采用无污染且造价低的超细水泥注浆配方来对开采区进行封闭。经过系列配方的优化选择，最终确定优化的配方是水灰比为0.8，微硅粉掺量为6%，膨润土掺量为2%，聚羧酸减水剂掺量为0.4%，此时浆液的性能基本达到工程要求。

Study on Sealing Slurry Formulation for In-situ Grouting in Oil Shale

In the process of in-situ exploitation of oil shale, the production well communicates with the surrounding environment, and the oil generated in situ easily penetrates into the surrounding formation to cause environmental pollution. At present, there is no economical in-situ sealing technology to solve this problem. Based on the principle of grouting closure, this paper proposes to use a non-polluting and low-cost ultra-fine cement grouting formula to seal the mining area. After optimization of a series of formulas, it is finally determined that the optimum formula is made up with water-cement ratio of 0.8, micro-silica powder content of 6%, bentonite content of 2%, and polycarboxylate water-reducing agent content of 0.4%. The performance of the formula basically meets the engineering requirements.