As the need for reaching fuel reserves at greater depths increases, scientists have been exploring and developing the technology required to efficiently drill rock at highly pressured environments over the past 30 years. However, there are still gaps in the understanding of the physical phenomena involved. One of the basic problems has to deal with is the rock-bit interaction during the rock breaking process. In order to evaluate the drilling efficiency and bit wear in ultra-deep formation, parameters of ultra-deep drilling simulator were calculated based on the similarity principle, followed by the design and manufacture of ultra-deep rock-bit interaction simulator. Considering the influence of formation differential stress change on bit footage, the effects of weight on bit (WOB) and rotary speed on torque, bit wear and rate of penetration (ROP) were studied firstly under the conditions of in-situ stress of 240 MPa and temperature of 200 °C. The results of similar simulation test show that under the conditions of in-situ stress of 240 MPa and temperature of 200 °C, WOB at 8.0–8.5 kN and rotary speed at 180–240 rad are the optimal drilling parameters. Correspondingly, the on-site WOB at 128–136 kN and rotary speed at 45–60 rad are the optimal mechanical parameters on the drilling site, which can lead to high cutting efficiency and low wear rate of the bit. The horizontal differential stress has a significant impact on the ROP. With the increase of the stress difference in the horizontal direction, the footage efficiency decreases obviously, and the decrease degree is about 87.5%. The test results will help optimize rock breaking tools and drilling parameters to improve rock breaking efficiency.

随着在更深处达到燃料储备的需求增加，科学家们一直在探索和开发在过去 30 年中在高压环境中有效钻探岩石所需的技术。但是，对所涉及的物理现象的理解仍然存在差距。必须处理的基本问题之一是岩石破碎过程中的岩屑相互作用。为评价超深地层钻井效率和钻头磨损，基于相似性原理计算超深钻井模拟器参数，设计制造超深钻头相互作用模拟器。考虑地层不同应力变化对钻进尺的影响、钻压（WOB）和转速对扭矩的影响，首先在地应力240 MPa、温度200 ℃条件下研究了钻头磨损和钻速(ROP)。类似模拟试验结果表明，在地应力240 MPa、温度200 ℃条件下，WOB为8.0~8.5 kN，转速为180~240 rad为最佳钻井参数。相应地，128-136 kN的现场钻压和45-60 rad的转速是钻井现场的最佳力学参数，可实现高切削效率和低磨损率。水平差分应力对ROP有显着影响。随着水平方向应力差的增大，进尺效率明显下降，下降程度约为87.5%。