Research On Complex Formation Using Drilling Techniques In Yangshan Gold Mine Area Of Wen County Gansu Province

Gansu Yangshan mining area is the key gold district of the Armed forces of gold. The exploration task is undertaken by the twelve team of the Armed forces of gold.This mining area was found by Armed forces of gold in 1997, accumulated to explore gold resources of 308 tons, located in Southern Gansu and Northern Sichuan, at the north of Minshan mountains and west of Qinling Mountains, the junction of Shanxi, Gansu and Sichuan provinces, is the largest Carlin type gold deposit in Asia. In recent years, with the expansion of the construction area, the complex formation problems encountered and the leakage problem in this area become more and more difficult and serious, core drilling is one of the exploration methods that must be used in the exploration of solid mineral geological exploration, especially in the determination of deep mineral resources.Core drilling is still the most important way to obtain visual geological data in geological engineering exploration in the future, so it is significant to do research on the Yangshan drilling construction technology and find methods to solve the problem of construction to control construction cost,improve the efficiency of construction,and serves better for geological prospecting by scientific means. Meanwhile, it counts much to consolidate the Yangshan gold deposit to the world. In case of the model performance is relatively stable and the personnel operation technology in a long time without considerable changes, research on a wider range of options in the various pipe process mutual combination and with more flexible wall plugging technology has a decisive significance in drilling construction smoothly in the region.In this paper, the mining area is the research area, in the full collection of natural geographical and geological environment, based on the combination of geological conditions, geological core drilling characteristics, the types and characteristics of complex formation, and the impact factors of geological core drilling and construction in complex formation were analyzed, the main measures to carry out drilling in complex formation were presented. The main research results are as follows:1. A comprehensive introduction to the Yangshan gold deposit geological characteristics, physical properties of rock and drillability, and analysis of drilling and construction in complex formation in the mining area2. A comprehensive analysis of the Wenxian Yangshan gold deposit drilling technology index, summed up to five technical problems: drilling in the Quaternary overburden, leakage control, construction in broken layer of Calcium/Carbon shale phyllite, increase of casing depth, control of drilling trajectory.3. For Wen County gold mine drilling technical problems, by means of optimizing the hole structure, using the cone bit and PDC comprehensive drilling technology,large diameter wireline drilling technology, diamond bottom jet drilling technology,directional drilling comprehensive drilling technology, the problems were better solved.