## 7 Conclusions  
In this paper, based on the requirements of the in situ insulation and coring of deep rocks, and based on energized smart drill pipe technology commonly used in the logging field, an innovative conductive center pole was developed. The conductive center pole meets the power supply and lifting strength requirements for the in situ insulation and scoring of deep rocks. With a small size, high-reliability connection and self-adjustment function, it can realize the non-winding energization and communication between the center poles.  
* According to the requirements for the in situ insulation and coring of deep rocks and referring to the design of smart drill pipes in logging, the overall design of the conductive center pole is proposed.
* The innovative design process of the conductive center pole is proposed, the functional requirements of the conductive center pole were analyzed, and the design matrix A was established and solved.
* The TRIZ solving tool was used to obtain a preliminary design scheme, and to further optimize the scheme to obtain a scheme with a higher comprehensive evaluation.
* The strength of the conductive center pole of the new structure was verified, and a physical prototype was made to conduct comparative experiments in a realistic environment to verify the feasibility of its function and structure.
* In addition, the feasibility of its application in the field of energy supply and signal transmission was verified through long-term heating experiments and sensor data acquisition tests.  
The conductive center pole technology proposed in this paper is of great significance for the realization of underground power supply and communication. The effectiveness of the integrated application and the design processes of the axiomatic and TRIZ design methods were verified. The preliminary research experiments were carried out in an ideal indoor environment. It performed well in the installation and resistance tests, and could realize a normal energy supply to the load under high-temperatures, which verified its  
Figure 30: Comparison experiment and results of the pressure sensor testing.  
characteristics of a non-winding and stable connection. It provides technical support for the accurate assessment of oil and gas resources and the realization of intelligent, efficient and safe digital drilling. It is also provides an innovative approach for the in situ insulation and coring of deep rocks. Follow-up work will continue to focus on experimental tests under high-temperature and high-pressure and practical engineering applications.  
Conceptualization, B.Y.; methodology, B.Y.; writing--original draft preparation, B.Y.; writing--review and editing, Z.H.; software, Z.H.; resources, J.Y.; investigation, Z.W.; data curation, C.L.; supervision, H.X.; funding acquisition H.X.; projection administration H.X. All authors have read and agreed to the published version of the manuscript.  
This research was founded by the National Key R&D Program of China, grant number 2022 YFB3706605, National Natural Science Foundation of China, grant number 52274133, National Natural Science Foundation of China, grant number 51827901.  
Not applicable.  
The data used to support the findings of this study cannot be shared.  
The authors declare that they have no competing financial interests or personal relationships that could appear to have influenced the work reported in this paper.