A Critical Evaluation of Water Coning Correlations in Vertical Wells
Anietie Ndarake Okon,
Dulu Appah,
Julius Udo Akpabio
Issue:
Volume 3, Issue 1, March 2018
Pages:
1-9
Received:
17 December 2017
Accepted:
3 January 2018
Published:
19 January 2018
Abstract: In oil and gas production, developing bottom-water reservoirs with active aquifer requires production strategy that can handle production-rate-sensitive phenomenon – water coning. The coned water that moves into the completion interval results in production related problems: excessive water production, surface water handling, low oil productivity, among others. To this end, several correlations: critical rate, breakthrough time and water-cut performance after breakthrough have been developed based on analytical, empirical and numerical approach to evaluate water coning tendencies in petroleum reservoirs. Some of the developed correlations have gained field application. However, limited literatures are available that have evaluated the prediction of these water coning correlations. Thus, the various water coning correlations for vertical well were evaluated and the obtained results show that most correlations have the same prediction profile. Conversely, these correlations predicted different coning parameters’ value. Further analysis of the results depicts that critical production rate and breakthrough time in vertical wells are indirectly dependent on fractional well penetration. In addition, the correlations developed from water-cut data for the prediction of water-cut performance after breakthrough indicate more realistic predictions in the water-cut profile than the correlations developed from water-oil ratio. Therefore, to delay water coning tendency in bottom-water reservoirs, fractional well penetration is a consideration in vertical wells to establish optimum critical oil rate and breakthrough time during oil and gas production.
Abstract: In oil and gas production, developing bottom-water reservoirs with active aquifer requires production strategy that can handle production-rate-sensitive phenomenon – water coning. The coned water that moves into the completion interval results in production related problems: excessive water production, surface water handling, low oil productivity, ...
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Prediction of the Mechanical Power in Wind Turbine Powered Car UsingVelocity Analysis
Youssef Kassem,
Hüseyin Çamur,
Abdelrahman Alghazali
Issue:
Volume 3, Issue 1, March 2018
Pages:
10-20
Received:
6 October 2017
Accepted:
3 February 2018
Published:
2 March 2018
Abstract: Savonius is a drag type vertical axis wind turbine. Savonius wind turbines have a low cut-in speed and can operate at low wind speed. It is suitable for small scale power generation, such as individual domestic installations. In this paper, investigation into the relationship between the type of Savonius rotor, the torque and the mechanical power generated was carried out. Also an illustration on how the type of rotor plays an important role in the prediction of mechanical power of wind turbine powered car. The main purpose of this paper is to predict and investigate the aerodynamic effects by means of velocity analysis on the performance of a wind turbine powered car by converting the wind energy to mechanical energy to overcome load applied on the rotating main shaft. The predicted result based on theoretical analysis is compared with experimental results obtained from literature. Prediction of the torque was done at a wind speed of 4 m/s, and an angular velocity of 130 RPM according to meteorological statistics in Northern Cyprus.
Abstract: Savonius is a drag type vertical axis wind turbine. Savonius wind turbines have a low cut-in speed and can operate at low wind speed. It is suitable for small scale power generation, such as individual domestic installations. In this paper, investigation into the relationship between the type of Savonius rotor, the torque and the mechanical power g...
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The Role of Information and Communication Sharing Pathway in Improving Peri-Urban Dairy System of Bamako, Mali
Sidibe M’baye Thiam,
Joseph Wafula Matofari
Issue:
Volume 3, Issue 1, March 2018
Pages:
21-28
Received:
10 November 2017
Accepted:
25 November 2017
Published:
6 March 2018
Abstract: Information Communication Technology (ICT) has been used as one of the intervention strategies in the reduction of post-harvest losses along the agricultural value chains in the developing countries. ICT has been used in Malian agriculture in general as an intervention strategy, but not specifically in the dairy sector. In recent years there has been an improvement in the dairy sector due to the peri-urban dairy farming, which has resulted into intensification of the milk production because of improved breeds and the easy access to feed. Despite the increase in the volume of milk production in Mali that has been estimated to be about 2 billion liters per year, only 45% of this production is being utilized. The aim of this study was to determine the role of ICT in reducing these losses in peri-urban of Bamako. Data was obtained through semi-structured questionnaires and interviews. Multiple-stage sampling procedure was used to select the respondents (n=171). The most common information sharing pathway used by the peri-urban sub-value chain actors was the mobile phone with 93% at the farm level, 89% at the transportation level and 71% at the cooperative level. The most sought type of information by peri-urban dairy farmers at the cooperatives was on feeds at 42%, animal health at 14% and cooperative issues at 13%. Information sharing through mobile phone was the most type of communication pathway used and therefore can be used an ICT intervention that can contribute towards reducing milk post-harvest losses along the value chain.
Abstract: Information Communication Technology (ICT) has been used as one of the intervention strategies in the reduction of post-harvest losses along the agricultural value chains in the developing countries. ICT has been used in Malian agriculture in general as an intervention strategy, but not specifically in the dairy sector. In recent years there has be...
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