Magnetic Thickness Detector (MTD) and Multifinger Caliper (MFC) Tool for Well Integrity Assurance in PHE ONWJ

Abstract

The paper will present case study of well integrity issue in well ED-2ST, PHE ONWJ. Well ED-2ST is located in E-Main structure at Echo field, PHE ONWJ. The well has been producing since 1990 before shut in due to fish problem in March 2015. The well last production test was 250 bopd and 56% WC. The well was proposed to be recompleted to recover the remaining reserves.

Magnetic Thickness Detector (MTD) and Multi Finger Caliper (MFC) tools were run after POH tubing string to inspect the 7" liner and 9-5/8" casing. Both tools were run from 3355' MD to surface. The MTD tool will provide the metal thickness or metal losses of the tubular, while the MFC will provide the tubular inside diameter which later on can be compared to its nominal value.

Based on both tools inspection, there was clear casing integrity issue in ED-2ST. The MTD results suggest that metal thickness losses at interval 1429 1468' MD is 38% with maximum loss depth at 1465' MD. And the MFC result suggest that there is casing leak/ parted at interval 1464-1467' MD, at that interval all caliper finger (56 arms) showed the ID size is equal to OD size of the tubular.

Based on the well integrity, the recompletion of ED-2ST was postponed. Further integrated assessment is on-going to recover the remaining reserves from the well. Also, the well integrity inspection will be performed as best practice prior to major workover in "old wells".