ABSTRACT A non-weighing lysimeter was designed, fabricated, tested and installed at Arochukwu, Abia State, Nigeria, where the farmers who engage in dry season vegetable production do so with no knowledge of irrigation water requirements. This method tends to either over-irrigation or under-irrigation below the vegetable water requirements. Too much water can leach costly fertilizers to depths below the root zone, where both the water and fertilizer are permanently lost. Too little water ...
ABSTRACT In this work, the operation and performance of a novel Separation Tray Column under Vertical and Tilt conditions is presented. The Tray Column used for the work is a Downcomerless liquid initiated and controlled Valve Tray with capacity to shut portions of the tray lacking liquid at any time. To evaluate the mass transfer performance of this column, an oxidation experiment was conducted at 300C and the percentage of Fe (II) oxidised to Fe (III) from contaminated water by air was ch...
ABSTRACT The theoretical study of methylammonium bismuth halide, (CH3NH3)3Bi2I9, was simulated using SCAPS 1D software package. The effect of the bismuth perovskite absorber layer thickness on the solar cell performance was investigated using three different materials (organic and inorganic) materials such as Cu2O, CuI, and spiro-OMeTAD as hole transporting layer (HTL), and four different materials (organic and inorganic) materials such as ZnO, TiO2, PCBM, and P3HT as electron transporting l...
ABSTRACT Optimizing the placement of new wells and well spacing is a vital issue in oil field development. Drilling infill wells is one way to maximize the recovery of oil from reservoirs. The problem of infill well placement is challenging because many different well scenarios must be evaluated when undertaking the optimization program and very often, the variables that affect reservoir performance are nonlinearly correlated with some degree of uncertainty. Using computational algorithms ha...
Abstract In the estimation of most reservoir parameters in well test, the reservoir is assumed to be isothermal which is practically not true due to the fact that there are heat sources due to friction in the wellbore, works done by the drill bit and in thermal recovery. Although, this temperature change is small, it can serve other beneficial purposes in the reservoir and wellbore. The research work used the temperature change to estimate permeability, skin factor and initial temperature of...
ABSTRACT Slug flow along slightly inclined horizontal pipes is a major problem in gas-liquid transportation, it is very pronounced in chemical, oil and gas processing industries. In reality, there is no absolute horizontal pipe due to the undulating nature/ Topography of the laid pipe terrains. Very little research has been done in this area because of lack of experimental data. This work is proposed to use raw experimental data from 10 degrees inclined horizontal pipe to analyze the flow pr...
ABSTRACT This thesis is focused on fabrication of biodegradable implantable devices for extended localized drug release. Paclitaxel (PT) was used as cancer drug in the study. Poly lactic –co- glycolic acid (PLGA) is a polymer used for drug elution. In this work, the role of enzymes on the degradation of PLGA, Effect of different pH on the degradation of PLGA and the kinetics of drug release was elucidated. PLGA ratios of 75:25 and 85:15 were used. The enzyme used in the study is lipase enz...
ABSTRACT The growing global understanding of ecological footprints and environmental pollution invented by humans is gainfully affecting our material design practice, pushing the search for more sustainable alternatives, and development of natural biocomposites. In this research, the natural ability of saprophytic fungi to digest and bind lingo-cellulose is utilized to develop natural biocomposite materials for novel applications in design and architecture. This study aims to provide an insi...
ABSTRACT When a well is drilled, the equilibrium in-situ stress is changed. In order to support the stress relief induced by the drilling and to prevent hydrocarbon influx into the cavity, the borehole is filled with a fluid. These operations create new stress configurations. The main point in wellbore projects is the definition of the drilling fluid density to keep the wellbore stable. The lower bound to the fluid density is the collapse stress that is the limit to shearing. The upper bound...
ABSTRACT The first part of this study discussed in details the two major model that was developed for the study of a multilayer reservoir system. They are the Dual permeability model proposed by Bourdet and the semipermeability wall model proposed by Gao. The pressure response of a crossflow system is observed in three stages; it behaves as a commingled system in the early stage and then as a single layer homogenous system in the late stage. There is a transition stage, which connects the ear...
ABSTRACT Despite its numerous benefits the search and production of crude oil poses a lot of dangers to the environment. Among these include land, water and air pollution. Prominent among the major sources of E&P waste is drilling operations which form the second largest source of waste after production activities. The major drilling wastes are drill cuttings, drilling mud and obnoxious gas emissions. These wastes are introduced into the environment through intentional as well as accidental ...
ABSTRACT The purpose of this work is to evaluate the uncertainty in the volumes of fluids in place in Fault Block A (Segment 3) of the G-1 Sands in the OND field located offshore Niger Delta. The evaluation was performed in three parts: (1) building of the static model and division into three hydrocarbon zones with reference to the oil-water-contact (OWC); (2) estimating the distribution of petrophysical properties such as porosity, water saturation and net-to-gross ratio in the reservoir an...
ABSTRACT Like any industry, the economic success of the oil and gas industry can be no swifter than its success in corrosion control/prevention. Some oil and gas industries operate in hostile offshore environment that harbors significantly quite substantially different corrosive agents including ions of chloride, Cl- , bicarbonate (HCO3 - ), hydrogen sulfide (HS- ), sulfide (S- ), etc., coupled with gases such as oxygen (O2), carbon dioxide (CO2), just to name a few. Oil and gas structural m...
ABSTRACT Oil reserves are now located in hard-to-reach locations. This, combined with low oil prices, makes drilling for new reserves very expensive and risky. Enhanced oil recovery, which increases the amount of oil that can be recovered from a reservoir, should therefore be considered. This work uses numerical simulation to determine the suitability of gum arabic as a polymer for EOR operations. This was done by matching core-flooding experiments using Eclipse. Simulation gave a waterflood...
ABSTRACT The wellbore integrity plays an important role in petroleum operations like drilling, well completion and production. Caliper, Electrical image logs, Acoustic televiewers (ATV) and Optical televiewers (OTV) are some of the devices currently used in the industries to identify breakouts. However, these techniques are restricted in applications. For instance; caliper sometimes indicates the effect of drill spiral grooves as borehole enlargement zones, poor resolution, and complicated p...