BOP is used to close the wellhead during oil testing, well repair, and well completion operations to prevent blowout accidents. It combines full sealing and semi-sealing functions into one, and has the characteristics of simple structure, easy operation, and high-pressure resistance. It is commonly used safety sealing wellhead devices in oil fields to prevent blowouts. There are two main types of common BOP: annular BOP and ram BOP. When using BOP on site, different types of BOPs are usually combined according to needs. Generally, the upper part is annular BOP, the middle part is full ram BOP and shear ram BOP, the lower part is half ram BOP, etc. There are different combinations according to site conditions.
Selection of BOP Assembly
The factors to be considered in selecting a hydraulic BOP combination are: well type, formation pressure, casing size, formation fluid type, personnel technical status, process technology requirements, climate impact, traffic conditions, material supply conditions, and environmental protection requirements. In short, it should be able to achieve balanced drilling pressure, ensure drilling safety, and save drilling costs.
1) Selection of Pressure Level
The working pressure of the hydraulic BOP assembly depends on the internal pressure resistance of the casing, the fracture pressure of the open hole formation at the casing shoe and the expected maximum wellhead pressure. But it is mainly determined by the maximum wellhead pressure that the BOP assembly is expected to withstand. There are five BOP pressure levels: 14MPa, 21MPa, 35MPa, 70MPa, 105MPa, and 140MPa.
2) Selection of The Diameter
The diameter of the BOP assembly depends on the casing size in the wellbore structure design, that is, it must be slightly larger than the outer diameter of the connected casing. There are nine types of BOP diameters: 180mm, 230mm, 280mm, 346mm, 426mm, 476mm, 528mm, 540mm, and 680mm. Among them, 230mm, 280mm, 346mm, and 540mm are commonly used on site.
3) Selection of BOP Assembly
The selection of combination form is mainly based on formation pressure, drilling process requirements, drilling tool structure and equipment matching conditions.
BOP is the most most important equipment to ensure well control safety. As deep and ultra-deep oil and gas resource exploration and development have become the main battlefield for oil and gas reserve and production in recent years, the design and manufacture of blowout preventers have also developed towards higher pressure and larger diameter. PWCE has always adhered to the core concepts of rigour, professionalism and reliability, and is committed to producing various high-quality blowout preventers. Please contact us for more detailed information on blowout preventer products.
If you have any questions or need more information, please feel free to contact our sales team.
Post time: Jul-26-2024