Publications

The Natuna sea area is known to have many comprehensive geological profiles and is also known as a big contributor for petroleum exploration. The West Lobe field is one of the fields that is located in the offshore Natuna sea. This field has produced millions of cubic feet of gas since it was developed and currently being operated by Premier Oil Indonesia. Various stratigraphic frameworks in the West Lobe field make development in this area very challenging with reservoirs having different characteristics. H-sand is part of Lower Gabus formation which is the main producing lobes in West Lobe and has been very well developed. H-sand is also connected through out Anoa Field (West - Central - East Lobe). Lama formation located below Lower Gabus formation and was not well developped. Lama formation has different chararcteristics compared to H-sand. Lama formation consists mainly of fluvio-deltaic, fluvial and alluvial fan sandstones – H. Darman (2017). H-sand is fine to medium grade sands with plant debris typically form thick, blocky or fining upward units and usually massive in appearance – H. Darman (2017). WL-5X was a gas producer from Lama formation at the West Lobe area and currently watered out. WL-5X was used to produce from H-Sands from 2012 until 2017. Lama formation was considerred has more producing potential hence a deepening and recompletion to access the Lama formation was executed in July 2017 and isolated the H-Sands interval. With that recompletion, WL-5X was producing only from the Lama formation. Higher production result was gained from Lama formation but not sustaining for long, gas production declined drastically and water start coming out. This paper presents the efforts to re-access H-Sands and conduct proper isolating of the Lama formation to restrore the production of WL-5X in the West Lobe area. This paper consist of the procedures and workflow which include identification and evaluation of the reservoir potential as well as the potential risk identification and measures required. This program also analyzes the field economics, which is very crucial in oil fields in the current oil industry situation. This work generated short term and long term opportunities that increases 4 MMscfd of gas production and added reserves of 4 Bcf. This means providing millions of dollars additional revenue and savings.