State Key Laboratory of Coal and Coalbed Methane Co-Mining
Yian Lanyan Coal and Coalbed Methane Co-Mining Technology Co., Ltd.
School of Civil Engineering, Henan Polytechnic University
Hubei Institute of Aerospace Chemistry Technology

高瓦斯低渗透性的煤储层严重制约煤炭和煤层气的高效生产，必须对煤储层进行致裂增透。航天固体推进剂爆燃能够产生大量的高能气体冲击煤储层，可以达到致裂增透煤储层的目的。为研究航天固体推进剂致裂煤体特性，首先以民用航天固体推进剂配方为基底，研发了一种用于煤储层致裂增透的固体推进剂，并对其性能、感度、耐压和耐温性能进行了测试，然后采用模拟煤样开展了航天固体推进剂致裂试验，并对试验过程中的孔壁压力和模拟煤样内应变进行了监测，最后根据试验结果分析了模拟煤样的破坏特征。结果表明：航天固体推进剂性能良好，具备防水、耐压和不产生CO等优点，能够适应煤矿井下的环境。试验过程中孔壁压力时程曲线呈现急速升压阶段、缓慢升压阶段和非线性降压阶段，孔壁压力上升时间约为18 ms；孔内压力峰值较低且分布不均匀，孔中压力峰值为118.1 MPa，孔底压力峰值为85.3 MPa。航天固体推进剂致裂过程中，模拟煤样内产生的应力波由压缩相和拉伸相组成，应力波强度较低、持续时间长并且随距离的增大衰减缓慢。航天固体推进剂致裂煤储层以高能气体的准静态作用为主，应力波能量的利用率较高。研究结果为航天固体推进剂在煤层气开采领域的应用提供了参考。

Coal reservoirs with high gas content and low permeability seriously restrict the efficient production of coal and coalbed methane. It is necessary to fracture and enhance the permeability of coal reservoirs. Aerospace solid propellant deflagration can generate a large amount of high-energy gas to impact coal reservoirs, which can achieve the purpose of fracturing and enhancing permeability of coal reservoirs. To study the characteristics of aerospace solid propellant for fracturing coal, a solid propellant for fracturing and permeability enhancement of coal reservoir was firstly researched and developed based on the formula of civil aerospace solid propellant, was, and its performance, sensitivity, pressure and temperature resistance were tested. The aerospace solid propellant fracturing test was then carried out using simulated coal samples, and the borehole wall pressure and strain within the simulated coal samples were monitored during the test. Finally, the destruction characteristics of simulated coal samples were analyzed according to the test results. The results shown that the aerospace solid propellant had good performance, with the advantages of waterproof, pressure resistant, and no CO generation, which could be adapted to the underground environment of coal mine. During the test, the time curve of the borehole wall pressure shown the stages of rapid pressure rise, slow pressure rise, and nonlinear pressure drop, in which the rise time of the borehole wall pressure was about 18 ms. The peak pressure in the borehole was low and unevenly distributed. The peak pressure in the middle of the borehole was 118.1 MPa, and the peak pressure at the bottom of the borehole was 85.3 MPa. Stress wave generated in simulated coal sample during aerospace solid propellant fracturing was composed of compressive and tensile phases with low intensity, long duration and slow decay with distance.. The aerospace solid propellant fracturing technology was dominated by the quasi-static action of high-energy gas, with high utilization of stress wave energy. The research results provide a reference for the application of aerospace solid propellant in the field of coalbed methane mining.

山西省科技重大专项资助项目（20181101013）；山西省科技重大专项揭榜招标资助项目（20201101003）

李军军，余梦飞，李国富，等. 航天固体推进剂对煤储层致裂增透试验研究[J]. 煤炭科学技术，2023，51（9）：121−128

LI Junjun，YU Mengfei，LI Guofu，et al. Experimental study of aerospace solid propellant fracturing in simulated coal sample[J]. Coal Science and Technology，2023，51（9）：121−128