PERTAMINA EP's Niru field development objective is to drain attic oil from the X0 sandstones. The thin fluvial-distributary channel environment of the reservoir brings drilling challenges due to the complex reservoir geometry and uncertain lateral continuity. A horizontal well was planned in order to maximize recovery of oil in this mature oil field well.An integrated LWD solution combining fit for purpose real time measurements from a continuous rotating bottom hole assembly, bed boundary mapping tool, formation images with real time correlation and Geosteering software, was used to steer the well in real time. The real time monitoring of petrophysical parameters, enabled TD to be decided after achieving maximum exposure to the reservoir. In addition, the analysis of dip information from formation images acquired while drilling enabled an important update to the field geological model to be made, while highlighting the limitations in reservoir characterisation of using data from vertical wells drilled into a structure with lateral variationsThe improved understanding of the reservoir, as well as the capabilities of the deep directional resistivity tool to locate and map the roof of the reservoir while drilling, enabled the wellbore to be maintained 1-2 m below it.This precise and accurate positioning of the wellbore in the reservoir sweet spot, resulted in the sustained production of oil at a rate almost 4 times higher than expected with the addition of low water cut. 2 IADC/SPE 155056The benefits of real time bed boundary mapping and well placement techniques have led to both a better understanding of the X0 channel sandstones reservoir, and a direct change in the development strategy of the field by Pertamina EP. This will now include further horizontal wells, which are now considered to be essential to the successful development of the Niru field, for draining oil from the thin (2-4 m thick) reservoir, which was previously thought to be impossible.

Onshore Northwest Java Basin (NWJB) is one of the proven hydrocarbon basin in Indonesia. Conventional Play for this basin are limited to deep reservoir target such as Parigi, Cibulakan, BRF, TAF and Jatibarang Formation. This lead to high cost for drilling. This Paper present new insight on Shallow target with less than 1000 m and proven as good reservoir. Previous study show that Cisubuh Formation is not a reservoir in many regional stratigraphy chart; it is a regional seal in onshore NWJB. This Formation contain only shale with intercalated sandstone in previous study. The method in this study is detail subsurface mapping of Cisubuh Formation in onshore NWJB including Seismic inversion analysis from seismic data to detect hydrocarbon anomaly, combine with lithological description from cutting and integrated with outcrop data and geochemistry data. Sequence stratigraphy and lithological description is use to make more accurate stratigraphic colomn of Cisubuh Formation. The result show there are Carbonat buildup in Cisubuh Formation, transgressive sand that have good reservoir property and conglomerate. Moreover, from outcrop study it show that Total Organic Carbon from 17 sample have a value 0,27 - 4,43%, it means Cisubuh Formation have a low-very good candidate as a source rock. From Pirolysis Rock Eval Analysis show that this formation have Tmax 331-557° C with Hydrogen Index 3-338 H/g. That means that the sample from this Formation is mature-over mature and from Hydrocarbon index this formation categorized as gas prone and oil prone. Drilling of KYM-01 well proving that Cisubuh formation is a good reservoir, it produce two MMSCF gas from Cisubuh interval. Optimizing this sudy will help for future development on many oil fields on onshore NWJB, shifting the paradigm from depth reservoir target

No abstract

No abstract

No abstract