Anhui is a resource-rich province with unique metallogenic geological conditions. It is located at the junction of North China, Yangtze River and Dabie Mountain. The famous Tanlu fault is located at the junction of North China and Yangtze River, running through the whole province from north to south, and it is one of the 19 metallogenic belts in the middle and lower reaches of the Yangtze River. In order to further accelerate the pace of deep prospecting, the 3 13 geological team of Anhui Bureau of Geology and Mineral Resources applied to the Anhui Provincial Department of Land and Resources and Anhui Bureau of Geology and Mineral Resources for the 2009 key scientific and technological research project of Anhui Province (No.:090 1030 15) "Research on Deep Ore Body Exploration and Drilling Technology and Equipment".
The research purpose of this project is to improve the exploration speed of deep ore bodies, the accuracy of exploration target areas and the accuracy of geological results, and to provide technical support for speeding up the search for concealed mines in China and opening up the "second prospecting space". The main task is to solve the problem of drilling efficiency in deep wells by developing drilling equipment and tools, drilling methods, coring methods, drilling wall protection, high-efficiency and long-life drill bits and other technologies; By studying the controlled directional drilling technology, the exploration problems of deep steep ore bodies, abnormal ore bodies and ore bodies under surface obstacles are solved. Through borehole camera and directional coring technology, the geological information collection of borehole is completed, and the parameters of rock and mineral beds are obtained from a single hole. After nearly four years of research, experiment, re-study, re-experiment and re-improvement, the project was completed at the end of 20 12 and passed the appraisal and acceptance.
(2) The main contents of the project research.
The project "Research on Techniques, Methods and Equipment of Deep Orebody Exploration and Drilling" is undertaken by the 3 13 Geological Team of Anhui Bureau of Geology and Mineral Resources, and assisted by China Geological Equipment Corporation, China Geo University, Wuhan Institute of Geotechnical Mechanics of Chinese Academy of Sciences, Wuxi Prospecting Tool Factory, Tangshan Jinshi Superhard Materials Co., Ltd. and Zhangjiakou Prospecting Machinery Factory. At the same time, invite domestic senior experts to guide the project.
The guiding ideology of the project "Research on Exploration and Drilling Technology and Equipment for Deep Orebodies" is to combine the needs of deep prospecting technology in China, fully integrate the advantages of domestic prospecting technology, and implement the mechanism of combining production, learning, research and use, so as to shorten the research cycle and accelerate the transformation of results. The general idea of the project is: in line with China's national conditions, focusing on the needs of on-site production, the research results are required to have good applicability, strong reliability, easy popularization and application, advanced innovation and independent intellectual property rights. The project is divided into four themes:
Topic 1: development of split tower full hydraulic power head drilling rig and high strength rope coring drill pipe
(1) Split tower full hydraulic power head drilling rig (FYD-2200)
1) drilling rig adopts split structure design, which changes the disadvantages of vehicle-mounted and mast-mounted structure of deep hole drilling to adapt to transportation in mountainous areas, hills, farmland and other areas with poor roads;
2) The lifting drilling tool is designed as a tower to increase the length of the stand;
3) The drilling rig realizes stepless speed change, which increases the speed regulation range;
4) Long stroke (4.8m) design of drilling rig to increase footage length;
5) The chuck of the power head of the drilling rig is designed as a dual-purpose structure of slip clamping and top drive;
6) The drilling rig operating system realizes parameter digitization, tower operation visualization and remote monitoring of drilling site.
(2) High-strength rope coring drill pipe
1) domestic advanced seamless pipes are preferred for drill pipes and joints, and special heat treatment is carried out to increase strength and wear resistance to meet the drilling requirements within 3000m;
2) The drill pipe thread pair is designed in a special form, which improves the performance of torsion resistance, tension resistance, anti-dropping and sealing;
3) Machining the thread of drill pipe joint with forming precision tool to improve the machining accuracy of thread.
Topic 2: Application of borehole camera and directional coring technology in geological exploration.
(1) borehole camera technology
1) to realize 360 hole wall digital imaging, seamless splicing and high-definition virtual drilling core diagram display;
2) It has the functions of deep-hole information transmission and digital analysis and processing;
3) Using borehole camera technology to analyze the occurrence of single-hole rocks and seams.
(2) Directional coring technology
1) study the core orientation system of straight hole and inclined hole, and expand the application scope of directional coring technology;
2) Design a constant pressure coring device to ensure reliable steering drilling and balanced reaction torque effect;
3) Study the water pressure balance to improve the reliability of mechanical silo seal;
4) Research the control device of hole bottom printing core to realize the automatic control of motor working state;
5) develop a miniature diamond bit to ensure the reliability of hole bottom printing of directional coring device;
6) Study the directional coring technology, and analyze the occurrence of rock and mineral beds in mud wall protection drilling.
Topic 3: Research on Drilling Design and Trajectory Dynamic Monitoring Technology
1) analyze the borehole bending law and predict the trajectory shape change law of the borehole to be drilled;
2) Design of drilling trajectory and drawing of drilling trajectory shape;
3) Spatial position calculation of drilling trajectory and target accuracy prediction;
4) Compiling the comprehensive design of exploration geology;
5) Automatic generation of comprehensive drilling data and electronic documents;
6) 3D visual dynamic display of drilling trajectory.
Topic 4: Research on deep core drilling technology and method.
1) Optimal selection and configuration of key equipment;
2) Drilling structure and casing design;
3) Drilling coring technology in special formation;
4) Development and application of high-efficiency and long-life diamond bit;
5) Mud wall protection technology;
6) Drilling trajectory control technology;
7) Prevention and treatment of accidents in holes;
8) Analysis of bit cost and technical index.
(III) Main achievements of the project research
After several years' research and practice, FYD-2200 split tower full hydraulic power head drilling rig and its supporting tools, high-strength rope coring drill pipes (N, H series, construction depth less than 3000m), geological exploration drilling camera and directional coring technology, drilling design and trajectory dynamic monitoring technology and deep core drilling technology have been completed in the project of "Research on Deep Orebody Exploration Drilling Technology and Equipment". Completed the undisturbed environmental scientific drilling hole for the study of late Cenozoic environmental changes in the lower reaches of the Yangtze River and Huaihe River and the late Quaternary environmental study in Shennongjia, Hubei Province, the WFSD 3 hole for scientific drilling in Wenchuan earthquake fault zone, and the ZK 1725 hole for deep ore body exploration and drilling technology and equipment. "NLSD- 1" hole and "site pre-study of scientific drilling in East China Luzong Basin" for national deep exploration, pre-investigation project of Zhengyangguan iron and polymetallic potential resources in Shouxian county, Anhui province, exploration hole of Mingguang salt mine in Chuzhou, in Huoqiu iron mine in Anhui province, Shapinggou molybdenum mine in Jinzhai, Nihe iron mine, Luzong iron mine and so on.
Project research * * * obtained 8 national patents (including 3 invention patents) and national computer software copyright 1 item. The four topics of the project have all passed the domestic and international sci-tech novelty retrieval and expert technical appraisal organized by Anhui Science and Technology Department. The small-diameter deep core drilling technology and supporting machine system comprehensively summarized in the project are of guiding significance to geological core drilling, scientific drilling, environmental geological exploration, hydrogeological water resources exploration and construction projects. The overall evaluation of the research results of the project is to reach the international advanced and domestic leading level.