长沙盆地红层岩石地层可钻性研究及应用

Research and application on drillability of red strata in Changsha Basin

摘要:

中深层地热能是一种储量丰富、分布较广、稳定可靠可再生能源，具有绿色低碳、清洁环保、安全优质、供能持续稳定等特点，在碳达峰碳中和实施路径中发挥着重要的作用。结合长沙盆地一个工程案例，采用岩石压入硬度计、电动应力式直剪仪和偏光显微镜分别对岩石样品的压入硬度、单轴抗压强度和岩性特性进行测试，从岩石的胶结物质、矿物颗粒、层理发育程度等方面对岩层可钻性的影响进行了分析研究，构建了该套地层的岩性可钻性等级，并对钻头的优选提出了建议，对本地区和类似地区的钻探工程具有一定的借鉴意义。

Abstract:

Medium and deep geothermal energy is a kind of renewable energy which is abundant， widespread， stabable and reliable. It is characterized of green and low-carbon， clean and environmental protection， safe and high quality， sustainable and stable energy supply， which plays an important role in the implementation path of carbon peak and carbon neutrality. Combined with an engineering case in Changsha Basin， this paper tests the hardness， uniaxial compressive strength and lithology of rock samples using the rock pression sclerometer， electric-stress direct shear instrument and polarizing microscope.The influence of rock cementing material， mineral particles and bedding development degree on the drillability of the strata is analyzed and studied. The drillability grade of the strata is established， and some suggestions on the drill bit optimization are put forward， which has certain reference significance for drilling engineering in this area and such similar areas.