1. Introduction
The Anshan Minefield is located in the southeast of Miaohagu mining area in Shaanxi Province, about 38 km northwest of Fugu County town. The northwest of Well-field system is adjacent to the Shaliang minefield and the Qinjin Coal Mine, the south of which is a small coal mining area and a reserved area in the south of Miaohagu mining area, the southwest of which is adjacent to the Sandaogou Well-field system, and the east of which is a Hagushan town prospecting area. There is F5 fault in the north of 2007 working face. Because the distance between boreholes are too large in current available geological data, the exact location and fall of F5 fault are not clear, which causes difficulties in the safe mining and layout of working face in this area.
2. Solution
Directional drilling technology is used to determine accurate position of F5 fault. This will provide a basic geological information for regional working face layout.
3. Construction situation
A directional borehole with 10 branches were constructed in 2007 working face to explore F5 fault in Anshan Coal Mine. The total drilling footage is 732m. The borehole trajectory extends inside the coal seam. The roof and floor of the coal seam are mudstone formation. Dip and azimuth angles are adjusted to control borehole trajectory. Inseam exploration was released successfully by the directional drilling technology.
4. Achieved accomplishment
The drilling project is carried out strictly according to the design. The drilling plane and section track are precisely controlled. Possible existence and predicted location of F5 fault are determined according to the borehole trajectory, which provides a reference for the later working face layout.
5. FAQ
Q1: What are the advantages of directional drilling over rotary drilling for the detection of geological anomalies?
A: Directional drilling technology can accurately determine the location of geological anomaly body, and can accurately reflect the track of the borehole and the strata encountered.
Q2: Why couldn’t the project pinpoint the location of the geological anomaly?
A: Since this project is only a single borehole drilling, which is only a “point” relative to the fault. It has a certain number of solutions. Thus, it can not be used as the final judgment of the strike and distance of the fault.
Q3: How does your company compare with other companies in detecting the direction of geological abnormity?
A:Our company adopts self-developed directional drilling equipment, with excellent operators and technical managers, and can provide geophysical exploration, drilling, hydrological analysis and other system services. So that the detection results can be verified in many ways, it’s more accurate to draw conclusions.
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