High Pressure High Temperature Coiled Tubing Intervention Operationsin the North Sea Within the Past Two Years

摘要

High Pressure High Temperature (HPHT) fields in the NorthSea continue to both push, and ultimately extend, theboundaries of what can be safely and successfully achievedthrough intervention with coiled tubing (CT). Within the lastsix years successful CT deployed perforating operations havebecome relatively common. However, as more and moreHPHT fields consider intervention operations, existingtechnologies are subsequently examined and re-examined tosuit the particular well criteria and also the actual operatingenvironment of the particular offshore installation.This paper begins by discussing the types of equipment thatare required for HPHT CT intervention. It then presents anumber of recent case histories concerning CT interventionson HPHT fields. Three of these case histories involve differentunderbalance perforating operations. Case histories concerningcementing operations through CT are also discussed. Thepaper outlines the specific types of downhole equipment thatare needed for these operations. This includes application ofnew equipment designs and novel solutions to both surface anddownhole constraints.Lessons learned from each of the case histories will bepresented together with an overview of the requirement thatHPHT fields and the related CT intervention technologies aremoving towards. Conclusions will be drawn from thesedifferent case histories and a discussion presented on thepotential extension for CT intervention in HPHTenvironments.