Smart Horizontal Well Drilling and Completion for Effective Development of Thin Oil-Rim Reservoirs in Malaysia

Chan, Keng Seng; Masoudi, Rahim; Karkooti, Hooman; Shaedin, Ridzuan; Othman, Mohamad

doi:10.2523/iptc-17753-ms

Cited by 4 publications

(1 citation statement)

References 14 publications

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“…In a similar case of thin oil-rim reservoirs development in Malaysia, horizontal wells with maximised fluid contact and reduced drawdown effect have fetched good productivity as well as delay in gas/water breakthrough (Chan, 2014). Dynamic simulation of horizontal wells at these structural features yield enchanced recovery factor versus conventional deviated or high-angled wells.…”

Section: Project Challengesmentioning

confidence: 99%

Realising Un-Swept Potential in Channelised Reservoirs of a Brown Field Using Well Placement Technology

Razak

Aldha

Ismail

et al. 2016

Day 4 Fri, March 25, 2016

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Rapid production decline of a mature brown field with high density of oil wells has triggered the need to search for trapped and undrained oil to arrest the decline. The field, ABC is located within the Malay Basin offshore Peninsular Malaysia and has been producing since 2002 with 40% reserves already drained. Recent reservoir studies have shown that oil pockets trapped in structural highs in water flooded reservoir and in structural lows in reservoirs with thick gas cap are unable to be drained with existing wells. Horizontal wells, with the aid of well placement technology were drilled to realise the potentials and increase field production.An integrated approach utilising data from reservoir static and dynamic models and seismic interpretation were used to identify targets in areas of structural highs and lows. Economically viable prospects were selected based on remaining reserves, sand thickness, structure, fluid contacts and locations of nearby water injectors/producers and confirmed by a pilot hole. Based on the results, horizontal well placement is designed with the aid of an imaging tool using resistivity inversion to identify the base or roof of sand to ensure optimum standoff from fluid contacts to prevent early water encroachment or premature gas coning.Two (2) horizontal wells were drilled with this approach. The first well, X targets 7m of oil column in a structural high bounded by oilwater contact and downdipping top of sand. The pilot hole confirmed presence of oilbearing sand and well placement technology was deployed to geosteer the horizontal section. A 200m horizontal section was drilled 3m above oilwater contact resulting in production of 1500 bbl/day. The second well, Y targets 6m of oil column in a structural low bounded by gasoil contact and updipping base of sand. 70m of oilbearing horizontal section was drilled with 0.5m standoff from the base channel resulting in production of 1000 bbl/day. The usage of well placement technology has aided the subsurface team in landing the horizontal section by navigating the undulations at the base and top of the channel at a scale unresolved by seismic resolution. By analogue, the resistivity inversion confirmed the rugosity of base and top of channel sand in many similar clastic reservoirs. Due to the dynamic of producing reservoir and variability in reservoir quality, the observed fluid contacts are also different for different oil pockets in the same reservoir highlighting the risks that need to be considered when proposing future targets. This strategy coupled with the well placement technology has allowed the realisation of otherwise stranded few MMstb oil in this brown field. This strategy can be replicated for clastic reservoirs in mature brown fields around the globe facing a rapid decline in production.

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Section: Project Challengesmentioning

confidence: 99%