The Hydril MSP Annular Blowout Preventer (BOP) is a core pressure control device in the drilling process, specially designed for blowout prevention and control in oil and gas drilling operations. Strictly complying with API Recommended Practice R.P.53 and NACE Standard MR-01-75, it features excellent sealing performance, broad application adaptability, and convenient operation and maintenance. As an indispensable safety guarantee for onshore and offshore drilling platforms, it provides reliable support for mitigating risks such as well kicks and blowouts throughout the drilling operation.

• Compatible with various onshore drilling rigs, it can achieve precise sealing for downhole components such as drill pipes, tool joints, tubing, casing, and wire ropes with sizes ranging from 3 1/2" to 16". With a rated working pressure of up to 2000 psi (138 BAR), it easily meets the pressure control requirements of drilling in both conventional and complex formations.
• Suitable for operating environments with water-based, oil-based, and oil-additive drilling fluids. By selecting sealing units made of corresponding materials, it can operate stably within the temperature range of -30 °F (-35 °C) to room temperature, adapting to onshore drilling projects under different climatic conditions.

• It adopts a reinforced elastomer packing unit. Hydraulically driven pistons compress the packing unit to achieve effective sealing of downhole components with different cross-sections, including circular, square, and hexagonal shapes. There is no need to replace dedicated sealing parts, which greatly improves operational flexibility.
• The packing unit has built-in steel segments with upper and lower flanges, which can effectively restrict rubber extrusion and flow, avoiding sealing failure under high pressure. Meanwhile, the rubber material is treated with a special formula, featuring excellent tear and wear resistance, which can maintain sealing integrity during long-term dynamic operations.

• Initial sealing is achieved through hydraulic actuation of the closing chamber. As well pressure or test pressure increases, well pressure acts on the piston from below the packing unit to further enhance the sealing force, forming a dual-protection mechanism of "hydraulic initial sealing + well pressure-assisted reinforcement".
• When well pressure exceeds the critical value, sealing can be maintained solely by well pressure without additional hydraulic supply. This not only reduces the operational load of the hydraulic system but also provides emergency sealing protection in case of hydraulic system failure, significantly improving safety redundancy under extreme working conditions.

• While maintaining full sealing, it supports drill pipe rotation and tool joint stripping operations. Fine-tuning the control pressure allows for minimal drilling fluid leakage, which not only ensures sealing effectiveness but also provides lubrication for drill string movement, reducing friction loss between the packing unit and the drill string.
• For onshore high-pressure fluctuation scenarios, a buffer absorber can be configured. Through precise pre-charging design (pre-charging pressure is 50% of the sealing pressure for onshore applications), it effectively suppresses impact pressure during tool joint tripping and running, extending the service life of the equipment.

• It offers two head designs: Screwed Head and Latched Head, both supporting quick disassembly and assembly. The replacement process of vulnerable parts such as packing units and sealing rings is simplified without the need for complex special tools.
• It supports packing unit replacement with drill string in the well during emergency situations. By smoothly cutting the packing unit between steel segments, replacement can be completed quickly when there is a drill pipe in the well, greatly reducing downtime and operational losses.

• Two material options are available for the packing unit: Natural Rubber (NR) and Nitrile Butadiene Rubber (NBR). NR is suitable for water-based drilling fluids, with a minimum service temperature of -30 °F and a longer service life; NBR is suitable for oil-based/oil-additive drilling fluids, performing stably in low-temperature environments below -7 °F. They can be quickly distinguished by appearance marks (red ribbon for NR, blue ribbon for NBR).
• The surfaces of key equipment components are anti-corrosion treated to resist corrosive media such as hydrogen sulfide. Meanwhile, sealing parts are made of special synthetic rubber materials, which can effectively resist erosion by oil, gas, water, and other media, ensuring long-term stable operation in complex drilling environments.

• Before storage, the equipment must be completely disassembled, cleaned, and thoroughly lubricated with non-petroleum-based lubricants such as castor oil or rapeseed oil to prevent rubber aging. Flange faces, hub faces, and annular grooves should be protected with wooden cover plates, and ports should be sealed to prevent moisture.
• Rubber products (packing units, sealing rings, etc.) should be stored in a cool, dry, and dark environment with the temperature controlled at around 65 °F. They should be kept away from heat sources such as heaters and motors as well as high-voltage electrical equipment to avoid ozone erosion. During storage, they should be kept in a natural relaxed state without stretching or bending. Vacuum-sealed packaging is recommended, and the "first-in, first-out" principle should be followed.
• Before commissioning after long-term storage, check rubber parts for aging phenomena such as blooming, skinning, and cracking. Ensure there are no hidden cracks after stretching and the hardness meets the standard before use. Replace them directly if there is any doubt.

Item	Diverter
Model	Model MSP 29 1/2″-500psi
Drift diameter	29 1/2" (749.3mm)
Rated working pressure	3.5MPa(500psi)
Hydrostatic test pressure	5.7MPa(750psi)
Hydraulic control rated working pressure	12MPa(1,714psi)
Recommended hydraulic control working pressure to close open hole	Sealing of open bore is prohibited. Minimum sealing diameter is 5" pipe
Recommended hydraulic control working pressure to seal pipe	8.3~10.4MPa(1,200~1,500psi)
Max. working pressure to close open hole	Sealing of open bore is prohibited. Minimum sealing diameter is 5" pipe
Max. open volume	No hydraulic line connection is required for the opening chamber; the piston opens by its own weight.
Max. close volume	238L
Weight	10820kg
Shackle lifting weight (t)	10t
Temperature ratings for non-metallic materials	BGB(PR1,-18℃~+93℃)
Temperature ratings for metallic materials	T-20/250(-29℃~+121℃)
Note: BOP should be designed and manufactured according to API Spec 16A. All metallic materials which come in contact with well fluids shall meet the requirements of NACE MR0175 for sour service.