System for Drilling an Offshore Shallow Sour Gas Carbonate Reservoir

Quitzau, R.; Brand, Patrick; Tarr, B.A.; Frink, P.J.; Leuchtenberg, Christian

doi:10.2118/52808-ms

Cited by 10 publications

(3 citation statements)

References 4 publications

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“…3 Reservoir rock samples taken from the first few exploration wells also indicated the presence of friable, chalky-textured formation especially at the top of the producing formation. The severe lost circulation problems encountered while drilling the initial exploration and delineation wells offered the first clues that the NSO formation may have limited mechanical strength.…”

Section: Rock Compressibilitymentioning

confidence: 98%

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Impact Of Rock Compaction On NSO Gas Field Performance

Pathak¹,

Wirya²,

Catanzano

et al. 2007

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe North Sumatra Offshore (NSO) field is a large gas field that supplies gas to the P. T. Arun Liquified Natural Gas (LNG) plant in Aceh, Indonesia. The field came onstream in 1999 and produces about 450 MMscf/d currently. The field has produced about 34% of the Original Gas In Place (OGIP) as of 1/1/2007, and the ultimate recovery is expected to be around 75%. The producing carbonates have an average porosity of 23% with zones of higher porosity at the top of the reservoir. Geomechanical testing of Malacca limestone cores indicated that the rock has high compressibility and suffers elastic and significant plastic deformation when mechanical stresses are increased.This paper presents results of the core analyses, the geologic, petrographic and stratigraphic description of the NSO carbonates, and the development of a reservoir simulation model that incorporates the rock mechanical properties, fluid flow properties and surface facilities models to history match NSO production and reservoir pressure behavior. The impact of porosity and permeability reduction by plastic deformation on field production is also examined. Rock compaction is shown to be an important mechanism for matching the NSO production history and it provides part of the support needed to explain the higher than predicted reservoir pressures. Aquifer influx is shown to be the other support mechanism that is essential to matching the field performance.

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Section: Rock Compressibilitymentioning

confidence: 98%

“…3 One of the wells, P-5, is drilled vertically and the other eight wells are highly deviated or horizontal wells. 3 One of the wells, P-5, is drilled vertically and the other eight wells are highly deviated or horizontal wells.…”

Section: Introductionmentioning

confidence: 99%

Impact Of Rock Compaction On NSO Gas Field Performance

Pathak¹,

Wirya²,

Catanzano

et al. 2007

All Days

View full text Add to dashboard Cite

show abstract

“…Quitzau et al (18) describe significant efficiency improvements applying PMCD during development phase of a project where the average duration per well was 4.7 days compared with 15.6 days during the exploration phase (drilled conventionally) Brainard (9) describes a Monte Carlo based simulation methodology employed to access the potential value of various MPD techniques applied to drill a deepwater GOM well. Although the paper does not present potential time savings, it does present the potential cost savings.…”

Section: Potential Efficienciesmentioning

confidence: 99%