This paper discusses the planning and deployment of an expandable-liner-hanger (ELH) system in an offshore high-pressure/high-temperature (HP/HT) well for the first time in the United Arab Emirates (UAE). This paper also describes issues faced in terms of liner deployment in HP/HT wells in UAE waters and a reliable solution that saved time and material costs.
The ELH system contains no setting mechanism or external components, such as slips, hydraulic cylinders, or pistons. The hydraulic-setting mechanism is contained in the setting-tool assembly and is completely retrieved, thus eliminating a potential leak path in the flowstream. The liner can be rotated and reciprocated in the hole or during cementing operations as necessary, which is not possible for conventional hangers. Furthermore, the selected ELH is manufactured from a material meeting critical specifications for maximum expandability and performance. This design incorporates several bonded elastomeric sections for HT and performance requirements. The elastomers supply both the sealing and the hanging capacity for the hanger. The differential-pressure ratings across the packer elements are related to the actual size of the tool and the casing through which they are being set. The hanger expansion (setting) is accomplished with a hydraulically actuated liner-running/setting-tool assembly. That assembly features a primary and secondary releasing system for maximum reliability....
First Expandable Liner-Hanger Installation in UAE in an HP/HT Well
01 April 2017