The TDC - 125 truck-mounted multi-functional drilling rig for coalbed methane is developed by our company based on years of R & D, manufacturing, and practical experience in drilling machinery. It is designed according to the characteristics of domestic coalbed methane exploration and exploitation, combined with advanced overseas experience and concepts in coalbed methane extraction. This rig features a simple structure, excellent performance, high cost - effectiveness, and is more suitable for the actual situation in China. It is mainly applied in coalbed methane extraction, shallow - layer oil drilling, oil well workover, geothermal water well construction, and can also meet the requirements of ultra - deep core hole exploration in China. Additionally, it can be used in engineering rescue, mine ventilation hole construction, and drainage pipeline construction.

The newly developed TDC - 125 truck-mounted multi-functional drilling rig for coalbed methane adopts a full - hydraulic drive, top - drive power head, telescopic mast, and tire - type walking structure. It is a highly efficient multi-functional drilling rig mainly for coalbed methane drilling. This rig can be used in various construction methods, such as air hammer percussion drilling, gas reverse - circulation drilling, and high - pressure mud drilling.

1）The drilling rig can meet multiple drilling methods for construction processes, mainly including the following: 

（1）Drilling method for coalbed methane horizontal branch wells.

（2）Air down - the - hole hammer drilling method.

（3）High - pressure mud drilling method.

（4）Gas reverse - circulation drilling method.

2）The main machine adopts a wheel - type walking method, which has the characteristics of strong mobility, flexible and reliable walking, high speed, and high efficiency. It provides a time guarantee for the smooth construction of the project and also saves the cost of road construction.

3）The mast translation mechanism of the drilling rig frame increases the support height of the drilling rig, strengthens the stability of the mast, and at the same time leaves sufficient lifting stroke for the wellhead and enough space for installing wellhead safety devices.

4）The power head adopts a hydraulic top - drive method with a large starting torque. The main shaft has a unique floating structure, which facilitates the loading and unloading of drill pipes and reduces the wear of drill pipe threads. Since most coalbed methane extraction involves vertical hole drilling, it brings great inconvenience to the loading and unloading of drill pipes. To solve this problem, the power head of the drilling rig adopts a tilting structure with a maximum tilting angle of 90°, which changes the unloading of drill pipes from the vertical direction to the horizontal direction, facilitating construction and reducing the labor intensity of operators.

5）The wellhead platform of the drilling rig adopts an open - and - close hydraulic wellhead, which is convenient for operation. At the same time, a clamping and uncoupling tong is installed above the wellhead, changing the way of using heavy - duty hydraulic tongs in imported and domestic drilling rigs for drill pipe loading and unloading. It adopts remote electro - hydraulic operation, which is convenient and reliable for construction.

6）The main machine is equipped with a random crane, which is used for auxiliary work such as lifting drill pipes and drill bits on - site, reducing the labor intensity of operators and facilitating on - site construction.

7）The drilling platform of the drilling rig is equipped with a crane, an operation room, a petroleum mud logging system, a pedestrian ladder, an escape slide, and a hydraulic wellhead baffle.