Shaffer Ram Blowout Preventer BOP 20 3/4" 3000psi Casting Type

Introduction to Shaffer Ram Blowout Preventer (Ram BOP)

The Shaffer Ram Blowout Preventer (Shaffer Ram BOP) is a key well control equipment in oil and gas drilling, workover, and well testing operations. Its primary function is to precisely control wellbore pressure, effectively prevent blowout accidents, and provide comprehensive safety guarantees for downhole operations. It can flexibly adapt to various complex working conditions and operational requirements.

• Solid Structure & Corrosion Resistance: Main pressure-containing parts body, bonnet, ram block, etc.) are made of high-strength, high-toughness alloy steel through casting and forging, reinforced by heat treatment, and tested for hydrostatic strength, fully complying with industry standards such as API Spec 16A and NACE MR 0175/ISO 15156. The top sealing surface of the body inner cavity undergoes chemical anti-corrosion treatment; the flange gasket ring groove and ram shaft packing hole of the bonnet are overlay-welded with stainless steel; the ram shaft packing retainer is made of special stainless steel, featuring excellent corrosion resistance and suitability for harsh downhole environments.
• Wide Range of Bore Sizes & Pressure Ratings: Offers a full range of bore sizes, including 7 1/16", 9", 11", 13 5/8", 16 3/4", 21 1/4", 26 3/4", etc., to match different wellbore and string requirements. The rated working pressure ranges from 2000psi (13.8MPa) to 15000psi (103.4MPa), meeting pressure control needs for medium-high to high-pressure operation scenarios.
• Reliable Ram Performance: Adopts HF-type forged rams (recommended) and S-type split rams. The forging process enhances ram strength and toughness. Available in various types such as pipe rams, blind rams, shear rams, and variable-bore rams, it can achieve functions including annular space sealing, full wellbore sealing, and emergency string shearing. Variable-bore rams can also adapt to sealing requirements of different-sized strings.
• Dual Protection of Sealing System: Initial sealing is formed through four key sealing points: ram top seal with body, front seal with string/itself, body with bonnet, and ram shaft with bonnet. Simultaneously, relying on well pressure-assisted sealing, downhole pressure pushes the ram to fit the sealing surface furtherly, improving sealing reliability. Equipped with a secondary sealing mechanism, in case of accidental damage and leakage of the sealing ring, emergency remediation can be performed by grease injection to avoid accident escalation.
• Structure Designed for Easy Maintenance: The bottom of the body ram cavity is equipped with high support ribs and a sand-settling inclined surface sloping toward the wellbore, which can automatically remove mud and sand, reducing the frictional resistance of ram movement. The hydraulic oil circuit adopts an internal buried structure in the body, avoiding damage to the oil passage during installation, transportation, and use. The bonnet adopts a hinged connection design, which can be rotated open, facilitating on-site disassembly, replacement, and maintenance of wearing parts such as rams and sealing elements, significantly reducing downtime.
• Flexible & Safe Operation Modes: Supports dual operations of hydraulic control and manual locking. Hydraulic control can quickly complete ram opening and closing actions within 3~15 seconds. The manual locking mechanism can lock the ram position during long-term well sealing without the need to maintain hydraulic pressure continuously. The dual guarantee improves operational safety.

• Hydraulic Direct Opening: If the ram is only closed hydraulically without manual locking, inject high-pressure oil into the ram opening cavity through the hydraulic control system (recommended operating pressure: 8.4~10.5MPa) to push the piston, driving the ram shaft and ram assembly to move away from the center of the wellhead, thereby quickly opening the wellbore.
• Hydraulic Opening After Manual Unlocking: If the ram has been locked by the manual locking device, first rotate the handwheel counterclockwise to drive the locking shaft to the end, then turn back 1/8~1/4 turn (to prevent jamming due to temperature changes), and then supply pressure to the opening cavity through the hydraulic control system to drive the ram to open. This is the only effective way to unlock the locked ram.
• Hinged Bonnet Opening: The bonnet is connected to the body through a hinge base assembly, which serves as both the bonnet rotating shaft and the hydraulic oil channel. When opening, simply loosen the bonnet bolts and rotate the bonnet through the hinge to facilitate removal of the ram assembly for maintenance. Opening a single bonnet will not cause the equipment to shift its center of gravity and tip over (ensure the equipment is fixed).

Pre-Installation Inspection

• Check whether the sealing gasket ring grooves of the wellhead flange and BOP flange are intact, and ensure the flange surface is free of protrusions, damages, or other defects.
• Confirm that the specifications of the ram installed on the BOP are consistent with the size of the downhole drilling tool to avoid sealing failure.
• Verify that the BOP has passed the pressure test and is qualified. During ground inspection, fill the BOP with water and open/close the ram once to expel air from the rear of the ram cavity.

Wellhead Installation Steps

• Apply thread grease meeting ISO 13678 requirements to the flange connecting bolts, tighten them evenly diagonally. Pre-tightening is performed in three stages (50% of total torque for the first time, 100% for the second time, and 100% for the third time). The tightening torque must comply with the requirements of the corresponding specifications.
• Connect the hydraulic control pipelines, ensuring consistency with the BOP opening/closing marks to avoid reverse operation.
• Connect the manual operating lever, ensuring the manual locking mechanism is firmly connected and flexible in operation.

Post-Installation Inspection

• Confirm the BOP is installed correctly, with the body lifting lugs at the top, and all connecting bolts tightened evenly diagonally in sequence.
• Test open/close each type of ram twice with a control pressure of 2~3MPa to expel air from the oil circuit. If the ram action is inconsistent with the master control unit handle indication, adjust the pipelines in a timely manner.
• Check the operational flexibility of the manual locking mechanism, record the number of handwheel rotations during well closing and mark it with a tag. After the test, rotate left to retract and unlock, then open the ram hydraulically.
• Check that the kill, and choke manifolds are properly connected, conduct a comprehensive pressure test on the wellhead equipment, and re-tighten all connecting bolts after the pressure test.

• Specialized Operation: Assign a dedicated person to manage the BOP. Operators must achieve "Three Understandings and Four Capabilities" (understand working principles, performance, and process flows; be able to operate, maintain, service, and troubleshoot faults).
• Standardized Operating Pressure: When there is no string in the well, the hydraulic control pressure for testing the closing of pipe rams shall not exceed 3MPa to avoid damaging the rubber packing. When there is a string in the well, it is strictly prohibited to close the blind rams and shear rams.
• Use of Manual Locking: For long-term well sealing, first close the ram hydraulically, then lock the ram through the manual locking device, and place a warning tag on the master control unit and control panel to prevent misoperation.
• Regular Inspection & Maintenance: After entering the target zone, open/close the ram once a day to check operational flexibility and manual locking function. Conduct a blind ram opening/closing test after each tripping operation (except when there is a string in the well). Perform regular tests on sealing performance, locking devices, shearing functions, etc., as required to ensure the equipment is in good condition.
• Timely Fault Handling: In case of faults such as incomplete ram opening/closing or sealing leakage, first relieve pressure and identify the cause (e.g., sand accumulation, sealing ring damage). It is strictly prohibited to disassemble the bonnet bolts or force operation under pressure.