Ongoing challenges are caused by incomplete data, deterioration in the integrity, and condition of the construction components
Side tracking effectively prevents any future re-entry into the original, primary, wellbore.
It is good practice to have at least two barriers between the hydrocarbon bearing formation and the environment. However, the barriers can often be compromised.
When the logging image shows neither cement, nor creeping formation, the wellbore/annulus must be remediated.
A subsea well which was to be abandoned, had a live annulus which required to be isolated before the full abandonment could be safely completed. Isolation had to be achieved without damaging the external casing.
Five wells needed to be plugged in connection with shutdown of an abandoned platform gas field on the UKCS. The quality of the existing annular cement at the barrier locations was either unknown or believed to be poor.
HydraWell was asked to support the operator in a four well abandonment campaign for suspended subsea production gas wells at 115 metres water depth. A key challenge was to ensure a quick turnaround from a planning perspective, in readiness for the offshore operations.
"I have been working with Hydrawell for the past 7 years and I have always been impressed by the forward-thinking nature of this company, the competency and dedication of its people, both onshore and offshore, the reliability of its tools and the quality of the work it performs days in and days out. This company inspires confidence"
"AkerBP used HydraWell’s Hydrahemera jetting PWC tool throughout the entire 4-year P&A campaign on Valhall DP, and with great success. Thanks to learnings kindly shared by ConocoPhillips, which pioneered the use of this technique, and to a close collaboration with Hydrawell, the time to restore barriers in a critical part of the overburden on Valhall dropped from 12 days down to 2.1, resulting in significant time and money savings."
Historically, three basic methods have been used to achieve an annular barrier. Each carries the risk of technical failure or of significant delays and increased cost beyond the forecast.