Abstract:In order to resolve the puzzle that the scaling on the inner wall of the drill pipe seriously restricts the safe， high-quality， and efficient implementation of wire-line core drilling， the comprehensive study was conducted on the scaling mechanism and influencing factors of diamond wire-line core drilling on the inner wall of the drill pipe. The results indicate that： When the structure of the drilling tool and the performance of the drilling fluid are constant， the solid content and particle size in the drilling fluid are the main factors affecting the scaling of the inner wall of the drill pipe. The particle size of rock cuttings produced by diamond core drilling ranges from 5 to 100μm， it is generally small and difficult to remove by the natural settlement. For the reason， the TGLW series small centrifuge is developed. Field tests have shown that the centrifuge can increase the peak value of solid particles in drilling fluid from 5~80μm to 3~10μm， the median particle size of the solid phase ranges from 11.189μm to 3.513μm， the solid phase clearance rate reaches over 90%， and the solid phase content of the drilling fluid is controlled below 0.5%， which not only maintains the performance of the drilling fluid but also prevents scaling on the inner wall of the wire-line drill rod.

Abstract:The 3000m scientific drilling project of Dayingezhuang in Zhaoyuan， Shandong Province is the deepest scientific drilling project in the Zhaoping fault zone in Jiaodong area， with a design drilling depth of 3000m. In order to improve the drilling construction efficiency and reduce the probability of accidents in the hole， the project adopts an efficient and stable XY-9DB variable frequency drill rig， self-developed high-efficiency long-life diamond drill bit， CHD76 series high-strength drill pipe and jointly developed LZRT360 drilling fluid centrifuge. The key technologies such as P/H wire-line coring hydraulic percussion drilling technology and wire coring coating drag-reducing inner pipe technology are adopted to carry out deep hole drilling construction， and the rinsing fluid system is optimized for different strata. The final hole depth of the project is 3120.35m， the final hole diameter is 78mm， the average core recovery rate is 95.6%， and the average core recovery rate is 97.9%. This paper summarizes the treatment methods， solutions， and equipment usage of complex formation drilling in the construction process of this project， aiming to provide references for similar deep drilling projects.

Abstract:With the comprehensive implementation of the new round of strategic breakthroughs in mineral exploration， the workload of mineral resource exploration continues to increase， and the contradiction between drilling engineering construction and environmental protection is becoming increasingly prominent. Guided by the concept of green development， it is particularly important to strengthen the application of green exploration technology and methods to reduce environmental damage in current drilling construction. This article introduces a series of green exploration techniques in the Yanzhupo work area of Mufu Mountain， including the use of a portable fully hydraulic drill for construction， the use of small tracked transport vehicles for relocation， the use of iron circulation tanks， geotextiles， and anti-seepage membranes to reduce flushing fluid and oil leakage pollution during site layout， the use of environmentally friendly drilling fluid and flushing fluid centrifuges during drilling， and the treatment of waste liquid， waste materials， and garbage after drilling completion， as well as site restoration. These measures reduce the damage of construction to the environment and provide valuable experience for future green drilling construction， and it is suggested to improve the standards and specifications for green exploration， increase the budget for green construction， explore unmanned aerial vehicle assisted relocation and high adaptability drill bases， and promote the effective implementation of green exploration construction.

Abstract:The spiral conveyor is an important component of the rotary system of the horizontal spiral centrifuge. As the only irregular rotary part， it will rotate at a high speed with the rotary system of the centrifuge. Therefore， the dynamic balance precision of the spiral conveyor will have an important impact on the service life of the whole machine. At the same time， because of the particularity of the structure of the spiral conveyor， the selection and implementation of dynamic balancing technology has some limitations and difficulties， which will affect the precision of dynamic balancing. Based on the theoretical analysis of the dynamic balancing effect of the spiral conveyor， the key factors affecting the dynamic balancing effect include the rotor structure， rotation radius and speed， etc.； and in combination with the dynamic balance test process， an optimized dynamic balance process is proposed， mainly including the dynamic balancing machine calibration， benchmarking， selection of counterweight position and the weighting method of residual unbalance， so as to reduce the residual unbalance of the spiral propeller， improve the precision of dynamic balance. Finally， through the monitoring and comparison of the temperature and vibration of the bearing seat of the centrifuge， it is proved that the process can effectively reduce the vibration of the whole centrifuge in working and improve the service life of the bearing.

Abstract:Based on the market demand of the flushing fluid centrifuge that is small, light, easy to move in medium-shallow hole of the small-diameter geological drilling, TGLW220×660 flushing fluid centrifuge has been independently developed. It has the characteristics of small volume, light weight, simple and compact structure, easy installation and disassembly, flexible, good treatment effect, low energy consumption and easy to move, etc. The whole structure, working principle, performance characteristics and of TGLW220×660 flushing fluid centrifuge are mainly introduced in this paper.

Abstract:3D entity model was set up for TGLW 220 660 flushing fluid centrifuge drum that is self-developed and used in geological drilling; using finite element analysis software, 3D finite element analysis and simulation were made on the whole structure of the drum under normal working conditions. The simulation analysis results show that the strength of the centrifuge drum under the normal working conditions can meet the construction requirements and the strength checking based on traditional theory further validates the rationality and reliability of rotary drum design, which provides the important theory basis for the safe use of TGLW 220 660 centrifuge in construction site.