PROTECTION

ARE YOU SEEKING SURETY IN APB MITIGATION SYSTEM DESIGN, MANUFACTURE AND DELIVERY?

Established in 1980, Balmoral has an enviable reputation across the world for product design, development and delivery.

With 500+ people based at our purpose-built 250,000ft2 facility in Aberdeen, we build successful relationships with clients working with them from concept development and advice through to product design, manufacture, testing, delivery and support.

All managed in-house to give total safety, quality and scheduling control.

 
BALMORAL CASING GUARD
Overview

As a subsea well is drilled, successively smaller casings are introduced creating several fluid-filled annular spaces and only the inner-most annulus can bleed off through the subsea tree. The outer annuli may be open to fluid movement through open shoes but, in practice, these annuli frequently get plugged off during cementing by formation collapse or solids settlement.

Due to the combination of extreme water depths and hole depth in many modern wells, HP/HT reservoir fluids can reach temperatures as high as 350°F while flowing. When a well is brought on-line these hot fluids rise-up the casing string, elevating the temperature of the casings and annular fluids during flow.

If natural thermal expansion of the annular fluids is restricted by plugging, a major pressure increase, known as annular pressure build up (APB), occurs. Pressure increases of 80-150psi/°F are typical, meaning that even a relatively modest temperature increase of 100°F can result in pressures approaching 15,000psi.

It is not generally cost effective and, in many cases, impractical to design the casing string to tolerate the potentially massive APB’s in modern wells. Engineered APB mitigation systems are therefore required to accommodate such expansion.

APB is known to have caused the rupture of intermediate and production casings on several wells over the last 10 years. The financial impact and recovery implications of such failures are enormous.

Balmoral casing guard

 
CONTACT US TO FIND OUT HOW WE CAN HELP SOLVE YOUR CURRENT TECHNICAL CHALLENGE
Please complete this field
Please complete this field
Please complete this field
Please complete this field
Please complete this field
Please complete this field
Please complete this field

Balmoral Comtec Ltd
Balmoral Park, Loirston, Aberdeen AB12 3GY | +44 (0)1224 859000 | surety@balmoral.co.uk
Registered number SC301819

© Balmoral Comtec Ltd Legal

Search