Peculiarities of Thin Oil Rim Development

Kolbikov, Sergey

doi:10.2118/160678-ms

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…Oluwasanmi [8] has highlighted 4 production strategies for oil rim reservoirs with respect to the pay thickness, gas cap and aquifer sizes. To create synthetic models of oil rim reservoirs that will befit a gas cap blow down strategy, a 2-level Placket Burman design of experiment is utilized using the Minitab software [1] . Data is gathered on factors that affect oil productivity in oil rim reservoirs (first column of Table 1 ) and used to generate 18 different oil rim models.…”

Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

“…Various factors affect the production of oil and gas in oil rim reservoirs asides the production strategies [1 , 2] . In the absence of real data to represent the oil rim reservoir a static reservoir model can be built using data from more than 50 oil rim reservoir from the Niger delta in conjunction with mensuration analysis using the Eclipse software method.…”

Section: Data Descriptionmentioning

confidence: 99%

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Dataset on modelling a synthetic oil rim reservoirs for optimizing oil production during gas cap blow down strategy

et al. 2022

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Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

Section: Data Descriptionmentioning

confidence: 99%

Dataset on modelling a synthetic oil rim reservoirs for optimizing oil production during gas cap blow down strategy

et al. 2022

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“…Oil rim reservoirs are characterised by oil columns of limited thickness (less than 25m), underlain by an aquifer and often overlain by significant a gas cap (Masoudi, 2012;Kolbikov, 2012). Typical recovery factors from these reservoirs are low, rarely exceeding 18%, due to rapid coning and early breakthroughs from gas and/or water, and oil smearing upwards into depleted gas caps.…”

Section: Introductionmentioning

confidence: 99%

The Discovery and Development of Oil Rim Fields in the Beibu Gulf, China

Fernie¹,

Zhou

McCarthy³

et al. 2018

ASEG Extended Abstracts

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SUMMARYThe Beibu Gulf is a prolific hydrocarbon province on the western coastline of China. The Miocene Jiaowei Formation contains thick sandstone sequences with excellent reservoir quality, a low degree of internal heterogeneity and excellent aquifer support. Structures are low relief causing many discoveries to be classified as thin oil rim fields (<15m oil columns with bottom-water drive). These discoveries have moderate to heavy oils with low gas-oil ratios and moderate to high oil viscosities. The combination of these rock and fluid properties are ideal conditions for rapid water coning, hence early well water breakthrough and low oil recovery factors. However, multiple fields in the Beibu Gulf significantly exceed pre-development production expectations. Closer inspection of core and log data indicates there is often a dolomitic alteration zone at the oil-water contacts with permeabilities typically 2 to 3 order of magnitudes lower than the hydrocarbon-bearing reservoir which act as effective aquitards to slow the onset of water breakthrough. The diagenesis is theorized to be due to microbial decomposition of hydrocarbons at the oil-water interface which accrete dolomitic cements as a byproduct. Seismic inversion and amplitude mapping reinforce the view that the alteration zones are pervasive and flat-lying. Case studies are presented covering the discovery, development and production performance of three oil rim fields in the Beibu Gulf.

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Improved Oil Recovery through Cost Effective In-Situ Gas Injection - A Case Study of Badin

2017

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Poor recovery of oil rims is a common challenge for most operators. The reasons are inherent subsurface risks and capital intensive EOR and IOR projects. This paper presents a similar case of reservoir with oil rim where a cost effective method was employed to increase oil recovery. The idea was to inject high pressure gas from a shallower gas reservoir into zone with oil rim. The case study is about B Field located in Sindh Province of Pakistan discovered through drilling of well B-1 in 1989. The well encountered hydrocarbon bearing Lower Goru X&Y Sands. Formation testing results and Open-hole logs showed X Sand to be gas bearing, whereas, Y Sand found thin oil rim overlain by gas cap. B-1 was put on production from Y Sand and it flowed at around 300 bopd with 500 scf/stb GOR. However, rapid decline in oil rates and reservoir pressure was witnessed due to gas coning. Based on engineering and G&G analysis, it was decided to re-pressurize oil rim in Y Sand using gas of X Sand at virgin pressure. Considering Y Sand to be laterally extensive body, effect of gas injection at B-1 should be observed at wells B-2 and B-6 in the same structure. Nodal analysis was performed to estimate injection rate while tank models were used to estimate additional recovery. The X Sand was then perforated and cross-flow established. Performance of gas injection was monitored through surveillance at B-2 and B-6 that recorded increasing Y Sand pressures. Success of in-situ gas injection was established as considerable improvement in oil recovery was achieved. In-situ gas injection, wherever applicable, could be an efficient technique to maintain reservoir pressure of oil reservoir without additional surface footprints or facilities thus incurring marginal capital expenditure. The efficacy of this technique could be easily monitored through regular surveillance and well production behavior.

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Peculiarities of Thin Oil Rim Development

Cited by 6 publications

References 2 publications

Dataset on modelling a synthetic oil rim reservoirs for optimizing oil production during gas cap blow down strategy

Dataset on modelling a synthetic oil rim reservoirs for optimizing oil production during gas cap blow down strategy

The Discovery and Development of Oil Rim Fields in the Beibu Gulf, China

Improved Oil Recovery through Cost Effective In-Situ Gas Injection - A Case Study of Badin

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