26 3/4" Ram BOP is the ram BOP with the largest bore size of Rongsheng Company, which can be equipped with 0-22" fixed ram, sealing 0~22" borehole drilling tools; It can also be equipped with a wide range of variable rams BOP, shear rams and high-temperature seals to meet the drilling needs under different working conditions.

※ RS- CS: Casting Shear

※ RS-FS: Forging Shear

Variable Ram BOP

Variable-bore rams (VBRs) enable you to seal a standard BOP on several different pipe diameters, improving operational efficiency and certainty during drilling and production.

Features

• Seal various diameters 

• Self-contained elastomer

• Large packer rubber reservoir to ensure a durable seal in all conditions

• Ram packers that lock into place and do not move due to well flow
  

FAQ

What is VBR in BOP?

The Variable-Bore Ram (VBR) is a critical component of a ram Blowout Preventer (BOP), capable of sealing on a range of tubular sizes. Unlike fixed pipe rams, VBRs offer flexibility in accommodating various pipe sizes in the wellbore, enhancing operational efficiency. They function similarly to standard pipe ram packers, with packers extending forward of the ram body faces.

Rongsheng recognizes the challenges faced by operators in sourcing compatible drilling equipment and services from multiple vendors. To address this, Rongsheng provides integrated drilling rig packages, including VBRs, ensuring efficiency, reliability, and high performance. These VBRs, installed on the BOP, extend to the center of the wellbore and can be utilized to shut the well in during well control events.

Whether for high-pressure or extended reach wells, Rongsheng's VBRs are tailored to fit specific drilling applications, guaranteeing superior rig efficiency and reliability. With Rongsheng's integrated offering, operators can minimize non-productive time and ensure seamless rig operations and rig up.

How do variable-bore rams work?

1. Variable-bore ram (VBR) BOP -- Most BOPs prefer the use of a VBR over a fixed-tube ram because of its flexibility to handle a variety of tubing sizes in the wellbore.

2. Variable-bore rams (VBR) enable ram blowout preventers to close and seal pipes of various sizes. 

This is in contrast to standard pipe rams that are designed to seal on only one size of pipe. In a standard pipe ram, the resilient fill material is supported against crushing by rigid steel plates that are shaped to fit snugly around the pipe. In VBR, the elastomer is contained in a series of segmented inserts that fit to conform to a wide variety of pipe sizes as well as tool joints, kelly and other parts of the drill string in sizes within the VBR range.

3. Variable-bore rams (VBR) are activated in the same way as standard pipeline rams packers. 

The packer extends to the front of the rams block face. When the rams are closed, the packers touch each other on the leading faces on either side of the tubular bore. As the rams continue to close, the elastomer in the packer moves inward against the pipe. In standard tubular rams, the packer only extends forward a fraction of an inch from the ram block face, because the elastomer only needs to "feed" inward enough to replace material lost through wear.

However, in the case of VBR, more radial displacement is required. There must be enough displacement to cover the range of pipe sizes for the rams, plus enough to replace material lost through wear. In VBR, the packer may extend an inch or more forward of the ram face. There is a practical limit to the amount the packer can extend forward to the face of the plunger. The most obvious limiting factor is the requirement that the rams packer not extend into the wellbore when the rams are fully retracted. This limits the range of pipe sizes for VBRs, especially if they are designed to fit existing BOPs.

Variable Ram BOP Dimensions：26 3/4"