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Search Results: 1 - 10 of 60473 matches for " Charles Y. Onuh "
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Well Placement Optimization Using a Basic Genetic Search Heuristics Algorithm and a Black Oil Simulator  [PDF]
Charles Y. Onuh, David Alaigba, Oluwatosin J. Rotimi, Bamidele T. Arowolo
Open Journal of Yangtze Oil and Gas (OJOGas) , 2017, DOI: 10.4236/ojogas.2017.24017
Abstract: In petroleum reservoir management, the essence of well placement is to develop and maintain reservoir pressure in order to achieve maximum production for economic benefits. Large production can be achieved with the placement of multiple wells but this approach is capital intensive and inefficient for the development of a reservoir. A preferable option is the optimal placement of production and injection wells so as to fully capitalize on the imbedded hydrocarbons at a relatively decreased capital investment. The aim of this study is to use developed algorithm and a black oil simulator to place wells in the zones for optimal recovery in the reservoir. Optimal production was determined out of eight scenarios created from well placement in a hypothetical reservoir (finch reservoir) using a black oil simulator, alongside an algorithm developed with java for determining the best possible locations for well placement, taking into consideration the reservoir permeability, fluid saturation, and pay zone thickness. The results of this study reveal that well placement using the engineering judgment coupled with the application of the algorithm using a black oil simulator results in better production compared to other scenarios which consider the combined effect of algorithm and black oil simulator alone.
A Review on Gas Well Optimization Using Production Performance Models—A Case Study of Horizontal Well  [PDF]
Kevin C. Igwilo, Emeka Emmanuel Okoro, Anthony Afam Nwude, Angela Onose Mamudu, Charles Y. Onuh
Open Journal of Yangtze Oil and Gas (OJOGas) , 2018, DOI: 10.4236/ojogas.2018.31005
Abstract: This study considered the solution methods to determine optimal production rates and the rates of lift gas to optimize regular operational objectives. The foremost tools used in this research are offered as software platforms. Most of the optimization hitches are solved using derivative-free optimization based on a controlled well Performance Analysis, PERFORM. In line with production optimization goal to maximize ultimate recovery at minimum operating expenditure, pressure losses faced in the flow process are reduced between the wellbore and the separator. Nodal analysis is the solution technique used to enhance the flow rate in order to produce wells, categorize constraints and design corrective solution. A hypothetical case is considered and sensitivity analysis using the IPR Models for horizontal gas wells provides the effect on pressure and liquid drop out. The gas lift method is economically valuable as it produced an optimal economic water cut of 80 percent with 2 - 4 MM scf/day rate of gas injection; thus, 1800 - 2000 STB/day gas was produced.
Evaluation of the Fluid Loss Property of Annona muricata and Carica papaya  [PDF]
K. C. Igwilo, P. A. L. Anawe, S. T. A. Okolie, Ikeagwu Uzorchukwu, Onuh Charles
Open Journal of Yangtze Oil and Gas (OJOGas) , 2017, DOI: 10.4236/ojogas.2017.23010
Abstract: This technical paper evaluates the fluid loss property of Annona muricata and Carica papaya, prepared and measured as per API standard. This is a laboratory measurements carried out using low temperature and low pressure filter press. The prepared fluids were supplemented with 2 ppb XCD polymer product to enhance their carrying capacity. Their characteristics and commercial availabilities were also investigated. The 30 minutes filtrate volumes at 5 ppb, 10 ppb, 15 ppb and 20 ppb were obtained. The graph of concentrations versus the volume of the filtrate obtained was plotted. It was discovered that the concentration increases with decrease in volume of fluid loss and impermeable filtered mud cake was also obtained. Though, both gave good results, but the results of Annona muricata under the same conditions and concentrations were better than that of Carica papaya.
Repositioning Universal Basic Education (UBE) in Anambra State for Sustainable Development through Effective Communication
WN Ofojebe, UR Onuh
African Research Review , 2009,
Abstract: UBE programme which is hoped to eradicate illiteracy and lead to the acquisition of manipulative skills and all rounded comprehensive education that fully equips the recipient to attain full potentials and contribute meaningfully to the development of the state and the nation has not been fully implemented in Anambra State. This paper, therefore, aimed at repositioning UBE programme in Anambra State for sustainable Development through effective communication. Four research questions and four null hypotheses guided the study. From a population of 270 principals and 5,949 teachers in the government owned secondary schools in Anambra State, 60 principals and 600 teachers were selected using proportionate stratified random sampling. Data were collected using a structured questionnaire of 29 items validated by two experts in educational management and policy and an expert in measurement and evaluation. The instrument was tested for reliability using Cronbach Alpha and it yielded coefficients of 0.81, 0.78, 0.88 and 0.76 respectively for each of the sections. Analysis was done using weighted mean for the research questions and t-test for the null hypotheses tested as 0.05 level of significance. Findings indicated that through effective communication, teachers who are the principal actors in the implementation of UBE programme will be fully involved and thereby enhance the achievement of the UBE objectives. Based on the findings conclusion were drawn and recommendations made.
Issues of Chaos and Recurrence in Infinite Dimensions
Y. Charles Li
Physics , 2009,
Abstract: Various issues with regard to chaos and recurrence in infinite dimensions are discussed. The doctrine we are trying to derive is that Sobolev spaces over bounded spatial domains do host chaos and recurrence, while Sobolev spaces over unbounded spatial domains are lack of chaos and recurrence. Local Sobolev spaces over unbounded spatial domains can host chaos and are natural phase spaces e.g. for fluid problems, but are very challenging to study.
Stability Criteria of 3D Inviscid Shears
Y. Charles Li
Physics , 2009,
Abstract: The classical plane Couette flow, plane Poiseuille flow, and pipe Poiseuille flow share some universal 3D steady coherent structure in the form of "streak-roll-critical layer". As the Reynolds number approaches infinity, the steady coherent structure approaches a 3D limiting shear of the form ($U(y,z), 0, 0$) in velocity variables. All such 3D shears are steady states of the 3D Euler equations. This raises the importance of investigating the stability of such inviscid 3D shears in contrast to the classical Rayleigh theory of inviscid 2D shears. Several general criteria of stability for such inviscid 3D shears are derived. In the Appendix, an argument is given to show that a 2D limiting shear can only be the classical laminar shear.
Chaos in Partial Differential Equations, Navier-Stokes Equations and Turbulence
Y. Charles Li
Physics , 2007,
Abstract: I will briefly survey the most important results obtained so far on chaos in partial differential equations. I will also survey progresses and make some comments on Navier-Stokes equations and turbulence.
Segment Description of Turbulence
Y. Charles Li
Physics , 2007,
Abstract: We propose a segment description for turbulent solutions to evolution equations in an effort to develop an effective description rather than the classical Reynolds average. The new description has connections with symbolic dynamics and shadowing technique. The challenge of future study is how to effectively implement the description numerically.
A Recurrence Theorem on the Solutions to the 2D Euler Equation
Y. Charles Li
Physics , 2007,
Abstract: In this article, I will prove a recurrence theorem which says that any $H^s(\mathbb{T}^2)$ (s>2) solution to the 2D Euler equation returns repeatedly to an arbitrarily small $H^0(\mathbb{T}^2)$ neighborhood.
The Poincaré Recurrence Problem of Inviscid Incompressible Fluids
Y. Charles Li
Physics , 2007,
Abstract: Nadirashvili presented a beautiful example showing that the Poincar\'e recurrence does not occur near a particular solution to the 2D Euler equation of inviscid incompressible fluids. Unfortunately, Nadirashvili's setup of the phase space is not appropriate, and details of the proof are missing. This note fixes that.
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