Rotating blowout preventer equipment

To meet the development needs of international and domestic underbalanced drilling technologies, our company has developed the WDXK series rotary blowout preventers. The products have obtained 2 invention patents, namely: the environmentally friendly closed-type rotary blowout preventer for underbalanced drilling, with the patent number: ZL 2017 1 0072389.4; the fully enclosed rotary blowout preventer housing, with the patent number: ZL 2022 1 0354232.1. 8 utility model patents, namely: the guide device for underbalanced drilling, with the patent number: ZL 2019 2 0291223.6; the centering assembly of the guide device for underbalanced drilling, with the patent number: ZL 2019 2 0291222.1; the conversion tray assembly of the rotary assembly for underbalanced drilling, with the patent number: ZL 2020 2025 4819.1; the mud umbrella assembly of the environmentally friendly closed-type rotary blowout preventer, with the patent number: ZL 2020 2025 4765.9; the fully enclosed rotary blowout preventer housing, with the patent number: ZL 2022 2077 4356.0; the integrated oil tank assembly of the underbalanced drilling power room, with the patent number: ZL 2023 2089 4973.9; the high-pressure clamp device for underbalanced drilling, with the patent number: ZL 2024 2 0441596.8; and the low-pressure clamp device for underbalanced drilling, with the patent number: ZL 2024 2 0441595.3. 
Purpose and scope of application 
The rotating blowout preventer is installed on top of the annular blowout preventer, the gate valve blowout preventer or the gate plate blowout preventer. During the implementation of underbalanced drilling techniques and other pressure-bearing drilling operations, it is used to seal the rotating drilling tools and play a role in diverting the flow. When it is combined with hydraulic blowout preventers, drill string check valves, liquid-vapor separators, and non-pressure well running and pulling pressure-boosting devices, it can safely carry out pressure-bearing drilling and non-pressure well running and pulling operations. It plays an important role in special operations such as liberating low-pressure oil and gas layers, leak-proof drilling, gas-filled drilling, and non-pressure well repair. 
2. Main Working Principle 
The drill pipe is rotated by the drive core assembly on the rotating control device, causing the central tube of the rotating sleeve and the rubber sealing core to rotate together with the rotating column. The rubber core relies on its own elastic deformation and well pressure to seal around the drill string. The dynamic seal between the central tube and the rotating assembly is achieved through the upper and lower dynamic seal assemblies. 
The hydraulic power room is used to control the opening and closing of the hydraulic clamps, and at the same time provides lubricating oil to lubricate and cool the internal components of the rotating assembly and the moving seal assembly. Circulating water is used to cool the upper moving seal assembly. 
3. Structural Composition 
The rotary blowout preventer is mainly composed of the rotary assembly, the housing, the hydraulic power station, the control pipelines, the hydraulic gate valve, and the auxiliary tools. 
4. Structural Characteristics 
a. Double-sealed core drilling tool, with reliable sealing and long sealing lifespan. 
b.  On-site replacement of sealing elements or rotating assemblies can be carried out conveniently and quickly, without being hindered by the rotating control device during the construction process. 
c. Simple structure, easy maintenance, wide range of applications 
d.  Overall disassembly and assembly of the rotating assembly to enhance work efficiency