EXPLORATION • DRILLING • FIELD SERVICES
W
hen flammable well gases, including harmful substances such as hydrogen sulphide, escape from a downhole safety
valve, they can cause severe environmental harm and pose serious safety risks. Te safety concerns involve potentially explosive environments. If these flammable gases reach the topside hydraulic power unit (HPU), there is a potential for explosion that may potentially be fatal to a rig worker. Problems can also occur if control lines are unexpectedly pressurised; this may affect the function of other valves in the system, resulting in safety shutdown valves being triggered. To help tackle these issues, JB Valves
has developed the Return Isolation Valve/ Blocking Valve (BVTD) as a means of automatically preventing hydrocarbon or contaminated fluid returns from entering the control system and environment. Tis novel offering is a single item that fits in the palm of the user’s hand and can be installed topside or subsea. Te BVTD provides environmental
hazard protection; it prevents the release of hydrocarbon gasses and chemicals to the atmosphere and sea. It has a simple in-line installation process, therefore no vent, tank or pilot lines are required. Further advantages include its compact and lightweight profile as well as the fact it is compatible with existing infrastructure. Return of unwanted hydrocarbons and contamination to a control panel, SCM, manifold or HPU can be prevented with JB Valves’ time delay solution. Te firm’s core application analysis centres around contamination and control line transmission of hydrocarbons. Te downhole safety valve (DHSV) actuator pilot line provides potential communication of hydrocarbons to the
JB Valves has created the BVTD to help prevent hydrocarbon or contaminated fluid returns from entering the control system
INTELLIGENT ISOLATION Jonathan Balmforth discusses environmental, hydrocarbon and contamination time delay return isolation
control systems and HPU; JB Valves’ solution safely isolates return migration. Te company believes that venting to atmosphere, capture and disposal utilising the flare stack, should be measures of last resort. Te BVTD isolates the hydrocarbons from the control systems, HPUs and environment, creating resilient and safe environmental protection. Fluid cleanliness can impact control system life; the time delay isolation valve can be used to prevent further contamination of control fluids by physical separation. Te company has developed a product that can easily be retrofitted within legacy or repurposed infrastructure and enhance existing field equipment. Te BVTD can be installed simply inline, with zero circuit impact, protecting control equipment and isolating potential hydrocarbon exposure.
The BVTD can easily be installed inline 20
www.engineerlive.com
WHAT IS THE FUNCTION? Te time-delay return isolation valve is a single, simple inline valve. Open position
is achieved by applying line pressure from 20-1,379Bar. In the pressurised state the valve remains fully opened; once line pressure is reduced, the valve closes after a predefined time delay preventing locked pilot pressure. As the line pressure is re- applied the valve returns to a fully opened state allowing for communication. No pilot, vent ports or tank lines are required and no additional accumulation. Fundamentally, JB Valves believes
that a product should be environmentally conscientious with the minimum amount of leak paths and emissions. Part of its design philosophy is to consider where weight and space can be saved while producing the most robust and innnovative solutions.
Jonathan Balmforth is managing director of JB Valves.
www.jbv.co.uk
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