Rapid drilling technology and key techniques for vertical material conveying wells over 600 m in coal mines

Abstract

With the increase of coal mining amount and continuous mining area, there are many problems in the auxiliary transportation system in coal mine, such as many transport links, long round trip time, reduced auxiliary transportation capacity and low comprehensive efficiency. The auxiliary transportation capacity of coal mine can be improved by adding vertical delivery wells. Take the construction of vertical delivery well over 600 m in Wangpo Coal Mine in Shanxi Province as the background, the feasibility of drilling technology and equipment such as geological drilling, oil drilling, pneumatic drilling hammer drilling, vertical drilling and raise-boring machine are demonstrated. In view of the favorable conditions of the production system formed in the lower part of the proposed vertical delivery well, the scheme of constructing a vertical delivery well with a depth of 617 m and a diameter of 1 m by using a reverse drilling machine is determined. According to the formation condition of vertical delivery well and the engineering characteristics of large depth and small diameter, the deviation control method of pilot hole drilling, the selection basis of reaming drilling raise-boring machine, the control method of reaming drilling parameters while drilling and the drilling safety guarantee measures are given. The engineering field application has been completed.

Keywords

• construction of wellbore
• drilling technology
• raise-boring machine
• mechanical cutting
• auxiliary transport
• reaming drilling
• deviating rate control