To avoid deviation in the drilling trajectory during
smalldiameter horizontal wireline coring drilling and drill pipe broken
induced by deviation, the experience of horizontal hole drilling in long and
large tunnels of various railway projects that have been completed and the
rotation characteristics of horizontal hole drilling equipment in the hole are
analyzed. After analyzing the working conditions of various components of the
drilling tool, such as drill string, cartridge chamber, cartridge stopper,
reamer, and the drill bit, as well as the deformation degree of the drilling
tool after being stressed, the hole diameter structure, and the occurrence and
integrity of the stratum, it is found that in addition to operating experience
affecting the drilling deviation, the drill bit posture has a significant
impact on the drilling deviation. Therefore, a smalldiameter
wireline coring drill pipe centralizer is further developed, which has been
applied experimentally in the exploration of ultradeep
horizontal holes in a tunnel of a plateau railway. The application results in
practical engineering show that the use of the drill pipe centralizer in smalldiameter horizontal wireline coring drilling effectively reduces the
deviation angle of the drilling hole and has a good antideviation effect. However,
to further rationally and effectively use the drill pipe centralizers, further
experimental research should be conducted on the number of centralizers
installed, spacing, and distance from the drill bit.
ZHANG Chi, WU Wanjiong, LI Fei, CHEN Kelin
. Exploration and Practice of Deviation Prevention
Methods for SmallDiameter Horizontal Wireline Coring
Drilling[J]. Tunnel Construction, 2023
, 43(S1)
: 283
-288
.
DOI: 10.3973/j.issn.2096-4498.2023.S1.032
