In conjunction with gauge developer, the Expro Group,Busak+Shamban designed a sealing system employing a series ofO-Rings with engineered back-up rings. The development of cableless gauges for measuring downholetemperatures and pressures, within oil and gas wells has been anindustry aim for some years; the principal advantages being costsavings and a reduction in installation times over conventionalsystems which use gauges connected by cables to the monitoringstation.
A critical stage in concept development has been the design ofeffective sealing between the steel outer housing and the centralcomponents, which dynamically control the sensitive instrumentationwithin the gauge.
To withstand temperature and pressure variance in operation andprovide long-term service, Busak+Shamban development engineerschose a specialised grade of Isolast® perfluoroelastomer, as O-Ringsealing material.
Testing of the cableless gauge is complete and sealing efficiencyachieved, taking the realisation of the ‘wireless well control andmonitoring’ concept, one step closer.
Busak+Shamban sealing arrangement - Isolast® perfluoroelastomer material O-Rings with back-up rings. Drawing produced by Busak+Shamban, with project acknowledgments to: Wireless Well Solutions. www.exprogroup.com
Project background:There is considerable motivation for the development of a cableless downhole gauge. The principal advance over a conventional (cabled) gauge is the elimination of expensive cable and lengthy installation time. Reliability is improved since the cable is the primary cause of failure in operation. Development of a cableless gauge as a retrofit item for existing wells, without the need to remove the production tubing, makes well instrumentation, generally, a more attractive and affordable proposition.