Research on the Influence of the Kilometers Rig Drilling Parameter on the Gas Drainage Effect

摘要

In 2005, VLD kilometer rigs were applied in Sihe Mine of JinCheng Anthracite Mining Group, but because of borehole equipment factors, drilling technology, mainly coal geological conditions, lead to poor drilling results. According to the situation of Sihe Mine, we can do experiments of drilling rig kilometers on typical coal, after analyzing and researching relationship with gas resoluble and experimental drilling which includes drainage negative pressure that is between 8kPa and 20kPa and drilling length that is among 400m, 600m and 800m. Finally we can get the effective parameters of kilometer drilling. Get conclusions: At the same drilling depth, the changing of negative pressure has little effect on gas flow, the negative pressure of drainage is adopted between 15 and 20kPa in Sihe Mine.Gas drainage concentration, extraction negative pressure and extraction flow are closely connected, if one factor's change will lead to other factor's change. So in order to get the best drainage conditions we must monitor and control them; With the increasing depth of drilling the initial drilling gas flow also increases, however, the increase of initial gas flow is not proportional to the depth of drilling, in the same conditions, the drilling depth influences gas drainage quantity, the longer the length of drilling is, the larger amount of gas drainage is. Comprehensive consideration, 600m is advisable for Sihe Mine kilometer drilling.