Deep rock is always under high-temperature conditions. However, traditional coring methods generally have no thermal insulation design, which introduces large deviations in the guidance required for resource mining. Thus, a thermal insulation design that utilizes active and passive thermal insulation was proposed for deep rock corers. The rationale behind the active thermal insulation scheme was to maintain the in situ core temperature through electric heating that was controlled by using a proportional-integral-derivative (PID) chip. Graphene heating material could be used as a heating material for active thermal insulation through testing. In regard to the passive thermal insulation scheme, we conducted insulation and microscopic and insulation effectiveness tests for hollow glass microsphere (HGM) composites and SiO₂ aerogels. Results showed that the #1 HGM composite (C₁) had an excellent thermal insulation performance (3 mm thick C₁ can insulate to 82.6°C), high reflectivity (90.02%), and wide applicability. Therefore, C₁ could be used as a passive insulation material in deep rock corers. Moreover, a heat transfer model that considered multiple heat dissipation surfaces was established, which can provide theoretical guidance for engineering applications. Finally, a verification test of the integrated active and passive thermal insulation system (graphene heating material and C₁) was carried out. Results showed that the insulating effect could be increased by 13.3%; thus, the feasibility of the integrated thermal insulation system was verified. The abovementioned design scheme and test results provide research basis and guidance for the development of thermally insulated deep rock coring equipment.

中文翻译：

---

保持原位温度的深部岩心的设计与验证

深岩石始终处于高温条件下。但是，传统的取芯方法通常没有隔热设计，这在资源开采所需的指导中引入了很大的偏差。因此，针对深部岩心提出了一种利用主动和被动绝热的绝热设计方案。主动隔热方案的基本原理是通过使用比例积分微分（PID）芯片控制的电加热来维持原位堆芯温度。石墨烯加热材料可以用作通过测试进行主动隔热的加热材料。关于被动隔热方案，我们对中空玻璃微球（HGM）复合材料和SiO ₂进行了隔热和微观及隔热效果测试气凝胶。结果表明，＃1 HGM复合材料（C ₁）具有出色的隔热性能（3 mm厚的C ₁可以绝缘至82.6°C），高反射率（90.02％）和广泛的适用性。因此，C ₁可用作深部岩心中的被动绝缘材料。此外，建立了考虑多个散热面的传热模型，可以为工程应用提供理论指导。最后，对集成的主动和被动隔热系统（石墨烯加热材料和C ₁）进行。结果表明，绝缘效果可提高13.3％；因此，验证了集成保温系统的可行性。上述设计方案和试验结果为保温深层取芯设备的开发提供了研究依据和指导。