Which Pressurization Method Is More Preferred for Rotary Drilling RIGS

During the operation of rotary drilling RIGS, the selection of pressurization methods has a crucial impact on construction efficiency, hole formation quality and other aspects. Different pressurization methods have their own characteristics and are suitable for different working conditions and geological conditions. Below, we will provide you with a detailed introduction to various pressurization methods to help you make a better choice in actual operation.

1. Cylinder pressurization: The cylinder is fixed on the mast, and the piston is connected to the power head slide frame. When in operation, the auxiliary hydraulic pump of the drilling rig provides high-pressure oil, pushing the piston to apply pressure to the power head. When stopped, the one-way balance valve locks the oil to prevent sliding. This method has a simple structure and is convenient for maintenance. Rigid pressurization is suitable for soil layer construction, but it is difficult to achieve pulse pressurization and the stroke is relatively short.

2. Hoisting and pressurization: Install the hoisting assembly on the mast. Place two steel wire ropes opposite each other on the drum and connect them through fixed pulleys and movable pulleys to respectively fix the upper and lower masts, achieving lifting and pressurization. Its advantage is that it can generate greater pressure with the help of movable pulleys and can be used in long spiral construction methods. However, its structure is complex, assembly and disassembly are cumbersome, and extra care is required during operation.

3. Continuous pressurization: It is suitable for hard strata such as clay layers or sand layers with high friction. Continuous and stable application of pressure can ensure that the drilling rig operates at high speed and low load, facilitating stable penetration through hard strata.

4. Combined pressurization and back-pressurization: In particularly hard strata, when encountering extremely high friction, it is necessary to constantly switch between pressurization and back-pressurization operations. In this way, the wear of the drilling rig can be effectively reduced and the drilling efficiency can be improved.

5. Point pressure application: For solid rock strata, such as rock layers, a powerful axial pressure is transmitted through the drill pipe mechanism lock to break or grind the rock in the form of point pressure application. In combination with constant pressure application, rapid rock cutting is achieved.

6. Floating pressure: Long floating pressure is commonly used during normal drilling. It generates downward pressure by the weight of the drill pipe and drill tools themselves. It is suitable for soft plastic clay layers that are prone to suction, loose fine sand layers that are prone to hole collapse, and fully weathered rock layers that are prone to hole deviation. Point floating involves slowly lowering the main coil, with the drill pipe load remaining on the main coil. It is mainly used to control the footage, such as in reduced diameter flow-plastic silt layers, vibrating pebble layers, and strongly weathered rocks prone to hole deviation.

There are numerous ways to apply pressure to rotary drilling RIGS, and there is no absolute optimal choice. Cylinder pressurization and hoist pressurization are common forms of pressurization, while continuous pressurization, combination of pressurization and pressure return, point operation pressurization, and floating pressurization are specific operation methods under different working conditions. In actual construction, it is necessary to comprehensively consider factors such as geological conditions, drilling requirements, and equipment performance, and reasonably select the pressurization method to ensure the efficient and safe progress of construction and achieve the best engineering benefits.