Publications

Most ESP systems are deployed in sub-hydrostatic wells which require artificial lift to produce the fluids. Meanwhile, some ESP are deployed to boost production in wells with sufficient reservoir pressure to flow naturally. Well JN X2 is a well in the JN Field, South Sumatera Block where an ESP was installed. Well integrity was good at the beginning of ESP installation but as the well is getting older a casing leak that resulted in fluid bypassing was found. A casing clamp was immediately installed to contain the leak fluid in order to minimize environmental and operational risks. Further investigation was carried out to find the most suitable long-term remediation method. This started with locating the leak in the production casing through CBL-VDL evaluation, Magnetic Thickness Detector (MTD) and also Acoustic Leak Flow Analyzer (ALFA)-Temp log. From all the gathered data, a well remediation was proposed to assure well integrity so that produced fluid can only reach surface through designated production string, instead of bypassing through any leak. A cementing job was firstly done to repair cement bonding above the estimated top of cement behind 5-1/2” casing at 4,005 ft MD to prevent any channeling from the formation. Unfortunately, one of the leak points was identified near the surface and cementing could not be done all the way up considering casing condition around the leak depth which has deteriorated and risk of breaking the 9-5/8” casing shoe. A solution to install new ESP string design with packer was proposed and installed to contain the fluid within production string/casing until production facility at surface. Packer integrity was tested by opening the casing valve and no more fluid observed flowing to surface.