BK-B

Applications

• Flow control from annulus to tubing (tubing-to-annulus configuration also available)
• Continuous or intermittent production
• High-performance gas lift installations

Benefits

• Enhances safety and wellbore integrity
• Reduces downtime with reliable, robust performance
• Lowers cost through versatility and efficiency 
• Operates uniformly across a range of injection pressures to increase production 

Features

• Field-proven design and operation
• Qualified to API Spec 19G2 V0 and TR2385
• Corrosion resistance with premium metallurgy
• Zero-bubble seal stack
• Guided valve stem that precisely aligns stem to seat during operation 
• Barrier-qualified back-check system that provides a robust seal between tubing and annulus
• Compatible with oval and round gas lift mandrels

How it improves performance

BK-B Barrier Series injection-pressure-operated (IPO) gas lift valves are used for continuous or intermittent gas lift production. Based on field-proven technology, these 1-in-OD retrievable valves feature a barrier-qualified integral back-check system, incorporating a metal-to-metal seal that has been developed and tested to meet API Spec 19G2 V0 standards. The back-check system has enhanced geometry to minimize erosion while maintaining dart stability during high-rate operations.

The seal stack has been tested beyond API specifications to meet zero-bubble requirements. The increased performance and reliability enabled by these features permit installing the BK-B valve as a well barrier element.

A nitrogen-charged bellows provides the force necessary to maintain the valves in a normally closed position. The bellows design incorporates a silicone-fluid dampening and overpressure protection device to increase valve life, while the dome gas volume has been optimized to help reduce load.

How it works

The BK-B valve is injection pressure operated. Precharged nitrogen pressure in the dome acts on the bellows assembly to hold the valve closed by creating a seal between the orifice seat and the ball. Injection gas enters the valve and acts on the effective bellows area, while tubing pressure acts on the effective port area of the ball. As these pressures overcome the precharged pressure in the dome, the bellows compress, lifting the stem tip and ball off the seat. Injection gas then flows through the seat, past the back-check system, and into the production conduit.