Publications

The Anoa field is a mature field producing mainly from Lower Gabus Sand formation as the oil producer since 1990. In 2000, the field was converted into gas producers, supplying gas to GSA1 scheme. The field comprises of two major fault-separated lobes, referred to as East Lobe and West Lobe, with the smaller Central Lobe in between. Two platforms were built to drain the hydrocarbons: Anoa platform and West Lobe platform. A-22ST3 is a horizontal oil producer from B2 sand formation of Central Lobe Area with a total rate of 59 BOPD with 1079 BWPD (95%WC). The B2 sand has been watered out and oil rates are expected to continue declining. Meanwhile, the A-22 ST3 has un-perforated behind pipe in the Lower Gabus A and B1 sand within potentially un-drained Central Lobe faults block. There was no well producing from this A/B1 Central Lobe. It’s expected that these sands are isolated and have not been drained by existing producers. However, the A sand is located above the production packer and requires work-over to access the opportunity while B1 sand can be perforated thru-tubing using e-line tractor or CTU. Challanges in data acquisition/ survillance at Anoa field particularly in A-22ST3 was mainly programmed in busy and packed of well services activity for cost optimization, then the most well intervention method need to be chosen. The surveillance plan was proposed to obtain reservoir pressure properties from A and B1 sand, well deliverability, and production allocation post workover operation. Considering cost optimization, rigless operation was the safest and the most efficient menthod with e-line operation combined with Well Tractor with Logging while tractoring mode. Not only save more than 8 hours operation than coiled tubing conveyance or a heavier intervention method, eline and well tractor invtervention enabled less people involvement in operation thus minimize safety risk and person on board accommodation management.