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A critical review of carbonate reservoir wettability modification during low salinity waterflooding

Petroleum 2023年第3期9卷 317-330页

作者： Perekaboere Ivy Sagbana kwame sarkodie Wilberforce Aggrey Nkrumah Zone 63 District 841DohaQatar Petroleum Engineering Department Kwame Nkrumah University of Science and TechnologyGhana Smart Fluids Laboratory Kwame Nkrumah University of Science and TechnologyGhana

The nature of carbonate reservoirs promotes the adsorption of oil onto the rock surface hence making oil recovery a challenge even with the interventions of varied chemical EOR ***,low salinity water flooding has become of great interest since it is cost-effective and environmentally *** low salinity waterflooding has been highly investigated in sandstone reservoirs,it is not the same for carbonate reservoirs due to its ***,it has been proposed as a favourable technique to mobilise the trapped oil in carbonate *** alteration is regarded as the most accepted mechanism for low salinity flooding but has not been well understood making field scale applications *** this paper,we present a detailed review of the wettability alteration mechanisms in carbonate reservoirs during low salinity *** influencing wettability alteration in carbonates and the interactions that occur at the rock/brine/oil interface are also *** different methods utilised for wettability measurements during low salinity waterflooding are also reviewed including their drawbacks and advantages and *** will provide an improved understanding of the low salinity flooding application in carbonate reservoirs.

关键词： Low salinity flooding Wettability alteration Carbonate rocks

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Tannin-Based Deflocculants in High Temperature High Pressure Wells: A Comprehensive Review

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Advances in Chemical Engineering and Science 2021年第4期11卷 263-289页

作者： Michael Kwadwo Fokuo Wilberforce Nkrumah Aggrey Mizpah Ama Dziedzorm Rockson Yen Adams Sokama-Neuyam Patrick Boakye Gershon Amenuvor kwame sarkodie Emmanuel Pinto Hassan Karimaie Department of Petroleum Engineering Kwame Nkrumah University of Science and Technology Kumasi Ghana Department of Chemical Engineering Kwame Nkrumah University of Science and Technology Kumasi Ghana Department of Chemistry Kwame Nkrumah University of Science and Technology Kumasi Ghana

Clay deflocculants that are commonly used in water-based muds under high temperature high pressure (HTHP) oilwell drilling conditions have been found to contain chromium which is toxic. Tannin-based deflocculants are regarded as a more environmentally friendly and suitable alternative to the chrome-based deflocculants. However, tannin-based deflocculants have not been studied extensively and understood completely, and for the past two years, there have not been many active pieces of research in the area. To advance research in the area, there is a need to critically and holistically review research works that have been done so far on tannin-based deflocculants as drilling mud additives to identify research challenges and opportunities. This review paper provides an overview of tannin-based deflocculants used in water-based muds under HTHP drilling conditions, including the various forms, thermal stability, deflocculating ability and environmental acceptance of the deflocculant. The review revealed that under HTHP conditions, modified and unmodified tannin-based deflocculants both deflocculate water muds well and are thermostable. However, only a few studies have been conducted on their usage as deflocculants at temperatures of 150ºC or above. The research gaps identified if pursued could advance the use of tannin-based deflocculants as green substitutes for the conventional chrome-based deflocculants.

关键词： Deflocculant Tannin Drilling Fluid Bentonite Flocculation High Temperature

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Enhancing the Productivity and Sustainability of Bambara Groundnut (Vigna subterranea (L.) Verdc.) Production Using Inorganic Phosphorus Fertilizer

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Agricultural Sciences 2022年第10期13卷 1117-1135页

作者： Kennedy Agyeman Joseph Nketiah Berchie Eric Owusu Danquah Sylvester Addy Agbesi Kwadzo Keteku Paul Marno Elvis Agyei Obeng Joseph Adomako Patrick Atta Poku Snr Joseph Addo-sarkodie Bernard Sakyiamah Michael Odenkey Quaye CSIR-Crops Research Institute Fumesua Kumasi Ghana Sunyani Technical University Sunyani Ghana kwame Nkrumah University of Science and Technology Kumasi Ghana Dept. of Agricultural Science Education University of Education Winneba Ghana

Phosphorus (P) is a vital element required for nodulation, stomatal regulation and photosynthesis in legume crops. P-deficiency in tropical soils limits the growth and productivity of Bambara groundnuts. The current study focused on determining the potential suitability of underutilized crops for food security using phosphorus fertilizer as soil amendment practice. A field trial was carried out at the Council for Scientific and Industrial Research—Crops Research Institute (CSIR-CRI), over two growing seasons to determine the optimum P rate for Bambara production. This trial was laid out in a split plot in a randomized block design with three replications. Bambara genotypes represented the main plots while four P fertilizer rates (0, 30, 45 and 60 kg P2O5 ha-1) were the sub-plots. The appropriate application rate of 60 kg P2O5 ha-1 showed excellent performance based on growth and yield analysis, and the results indicate a positive significant interaction between landraces and phosphorus fertilizer rates. The biological suitability of 60 kg P2O5 ha-1 increased the number of nodules per plant for Tiga Necuru, Kenya Capstone and Nav Red by 42.8%, 51.3% and 42.1% respectively, over control plots. The same for pod yield is 12%, 28% and 52% significantly higher than when P was applied at 45, 30 and 0 kg P2O5 ha-1 respectively. The results further revealed that on days to flowering and maturity, the plant height, the number of branches and dry matter increased significantly at each level of P fertilizer rate applied. Bambara production at 0 kg P fertilizer rate might not be sufficient to enhance Bambara productivity significantly. The outcome of this study reveals the suitability of phosphorus fertilizer application in enhancing the sustainability of Bambara groundnut productivity and the potential of Bambara in diversifying crop production to

关键词： Bambara Groundnut Phosphorus Genotypes Pod Yield

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