4D seismic interpretation in a Nigerian deepwater field

Effiom, Oghogho; Maskall, Robert; Quadt, Edwin; Lawal, Kazeem A.; Afolabi, R.; Emakpor, Jake; Mbah, Reginald

doi:10.1190/int-2014-0198.1

Cited by 3 publications

References 5 publications

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First time-lapse OBN in Bonga deepwater offshore field

Aikulola

Okpobia²,

Okonkwo³

et al. 2020

The Leading Edge

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Time-lapse seismic data from Bonga Field, located in deepwater Nigeria, have delivered excellent results previously from dedicated streamer seismic surveys (2000, 2008, and 2012) that image changes in amplitude due to water replacing oil. One challenge with the streamer data is the presence of a floating production storage and offloading (FPSO) unit. It is difficult to accurately repeat streamer acquisition geometry in economically important updip regions of reservoirs that lie beneath the FPSO. To ensure an accurate repeat of this area, we acquired an ocean-bottom node (OBN) survey in 2010 and carried out the first time-lapse OBN repeat of the survey in 2018. Time-lapse processing of the OBN data produced excellent results. We obtained an OBN-on-OBN normalized root mean square (NRMS) difference repeatability of 6%. This was an improvement over the 12% NRMS for streamer-on-streamer repeats. The OBN data quality was unaffected by the FPSO, enabling us to properly image the changes occurring in this area. The 4D OBN interpretation was used to identify bypassed oil opportunities. The data also were used to derisk well placement, optimize water injection, and update the dynamic reservoir models. The new models are essential to enhance predictability and field performance. We also analyzed an area northwest of the field where we extended the 2018 OBN acquisition and compared it to streamer data to optimize a new injection well location.

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First time-lapse OBN in Bonga deepwater offshore field

Aikulola

Okpobia²,

Okonkwo³

et al. 2020

The Leading Edge

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Application of four-dimensional monitoring to understand reservoir heterogeneity controls on fluid flow during the development of a submarine channel system

Zhang

et al. 2018

Bulletin

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Application of Interconnected Fibre-Network to Improve Sand-Control in Water Injectors: Preliminary Insights From Field Data

Lawal¹,

Okosun²,

Olatunji³

et al. 2015

All Days

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To minimise well-count, sustain high injectivity and enable high offtake rates from the associated oil producers, cased-hole frac-pack water injectors in deepwater fields are often operated at relatively high injection rates. However, continuous injection at high rates (velocities) may displace the proppants in the sand-control system, increasing the vulnerability of such injectors to impairments by fines invasion. To mitigate this impairment mechanism, a new fibre-based product (interconnected fibre network) was recently introduced for locking proppants in-place. Although the product was extensively tested in the laboratory prior to its release, its field performance and impacts on injectivity remain uncertain. To improve the reliability and longevity of a critical frac-pack water-injection well in a giant West-Africa deepwater oilfield, this proprietary product was recently deployed. Being the first field application in the exploration-and-production industry, this case-study presents an opportunity to validate the results of prior numerical and laboratory experiments while identifying relevant improvement areas for future developments and field applications. Specifically, the impacts of this product on well injectivity and other performance indicators were investigated. Within 6 months of start-up, the well injected ca. 7 MMbbl of treated seawater and surveillance data acquired. Although this fibre-reinforced cased-hole frac-pack injector is still at relative infancy, this paper presents initial insights gained from managing the well. For the current evaluation, the surveillance techniques employed include the Hall-plot and deep-bed filtration analysis, complemented by step-rate, injectivity and pressure-transient tests. Among other findings, the performance of this well is generally comparable to the conventional (unreinforced) frac-pack injectors completed in an analogue reservoir in the same field. To a reasonable extent, this pioneering case-study allays the pre-installation concerns that the product would hamper injectivity. The present observations notwithstanding, there remain some key uncertainties and challenges, which are potentially reducible as more statistically significant performance datasets become available from this field and elsewhere. It is too early to conclude from available data that the fibre-reinforced frac-pack performs better than the (previously used) non-fibre-reinforced frac pack injectors in this field.

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4D seismic interpretation in a Nigerian deepwater field

Cited by 3 publications

References 5 publications

First time-lapse OBN in Bonga deepwater offshore field

First time-lapse OBN in Bonga deepwater offshore field

Application of four-dimensional monitoring to understand reservoir heterogeneity controls on fluid flow during the development of a submarine channel system

Application of Interconnected Fibre-Network to Improve Sand-Control in Water Injectors: Preliminary Insights From Field Data

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