Among the accumulated HDD Machine in 2017, there were 4283 HDD Machines with a service life of 2 years (on the market in 2017 and 12016), accounting for 21.4%; 4389 Drill Machines for 3-5 years, 22.0%; There are 7538 rigs, accounting for 37.8%, and 3752 rigs over 10 years, accounting for 18.8%. Since horizontal directional drilling technology is mainly used for laying natural gas pipelines in recent years, the pipe diameter is relatively large. Therefore, in China, medium-sized drilling rigs (with a pullback force of 25-50 tons) are the main force models, and have accounted for the largest proportion since 2010, and large and extra-large rigs also account for a higher proportion than the United States.
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