9 research outputs found
A New Model for Predicting Liquid Loading in Multiphase Gas Wells
Liquid loading problem occurs when there is accumulation of liquid in the wellbore. The ultimate desire of this phenomenon is to reduce gas recovery or completely kill the production well. This challenge can lead to loss in well deliverability and as a result recovery of gas becomes low and cause heavy damage that the remedy would be costly. So many scholars have modeled to predict liquid loading onset but over the years the results gotten have shown one discrepancies or the other and could be difficult to use because of the challenges facing in predicting the bottomhole pressure of a multiphase flow. Numerical integration method was used in this new model while considering the introduction of valve equation along the functional nodes to the fundamental equation. The pressure drop across the functional node has not been considered by previous scholars. The result is very effective when compared analytically with other established work. The results also show the onset of transient flow and how quickly it stabilizes. Furthermore, the numbers of correctly predicted wells when validated with data was higher than the previous result
Evaluation of seismic and petrophysical parameters for hydrocarbon prospecting of G-field, Niger Delta, Nigeria
Adequate analyses of seismic and petrophysical data help to minimize drilling
risk and maximize well and reservoir productivity. Reservoir characterization
was carried out to provide information and improve understanding of the
geological and petrophysical parameters, and hence improve decision making
regarding the development of the field under study. Wireline logs obtained
from three wells as well as a 3D Seismic data coverage of G-field in the Niger
Delta were evaluated using the petrel software. Suites of gamma and deep
resistivity logs aided the delineation and correlation of the sandstone unit,
while the top was tied to the seismic data using synthetic seismogram to
determine seismic characters. Well correlation enabled the delineation of
reservoir sand across the wells. The quality of the reservoir was determined
from petrophysical averages, in which the reservoir has an average thickness
of 72 m, average porosity of 0.31, average net to gross of 0.75, average V-shale of 0.25, and average water saturation of 0.19, respectively. Listric normal
faults were mapped across the field. The models reveal lateral and horizontal
variations in reservoir properties which capture subsurface heterogeneity and
anisotropy across the reservoir sand, and also possible sweet-spot zones were
identified. These are diagnostic of areas for future exploitation and recovery of
hydrocarbon. Seismic attributes analysis was done to predict variation in
lithofacies across the sandstone body
ASSESSMENT OF LEACHATE CONTAMINATION OF GROUNDWATER AROUND IGHENRE EKOTEDO DUMPSITE, OTA , SOUTHWEST NIGERIA
The study was initiated at the instance of the Local Authority, to evaluate the physico-chemical param-eters (quality) of groundwater used by residence living around the Igbenre Ekotedo dumpsite. Nine (9) groundwater samples were collected randomly from boreholes around the dumpsite and were an-alysed for heavy metals including Fe, Pb, Mn, Cu, Cr, and Zn, using Atomic Absorption Spectroscopy. Other elements analysed for include Mg2+, Na+, K+, Ca2+, and anions such as PO43−, SO42−, NO3−, and Cl−.The physical properties tested for are their total dissolved solid (TDS), pH values, tempera-tures, hardness and electrical conductivity (EC). The results showed that the TDS, NO3−, hardness and EC concentrations of the water samples fell below the permissible limits set by the WHO standards for drinking water quality for the area except at location BH 3, BH 4 and BH 5. The concentrations of Ca2+, Na+, Cl−, SO42−, Zn and Cr are found to be below the WHO standard for all locations, but with relatively higher concentration values of Ca2+, and, Cl− at locations BH 3, BH 4 and BH 5. Also, the concentrations of PO43−, Mg2+, K+ and Fe are significantly higher than the prescribed WHO standard but with relatively higher values of Mg2+ and Fe associated with locations BH 3, BH 4 and BH 5. The spatial distribution maps of the examined parameters show a general increase in concentration towards the Southwest and Southern directions of the study area. This implies the likely direction of groundwater flow around the area since contaminants are usually mobilised and moved in the direction of groundwater flow. At the moment, the contamination is localised and limited to the South-western part of the study area and boreholes can safely be located at the North-Western and South-Eastern parts of the surveyed area
Data on artificial neural network and response surface methodology analysis of biodiesel production
The biodiesel production from waste soybean oil (using NaOH and KOH catalysts independently) was investigated in this study. The use of optimization tools (artificial neural network, ANN, and response surface methodology, RSM) for the modelling of the relationship between biodiesel yield and process parameters was carried out. The variables em- ployed in the experimental design of biodiesel yields were methanol-oil mole ratio (6 –12), catalyst concentration (0.7 –1.7 wt/wt%), reaction temperature (48 –62 °C) and reaction time (50 –90 min). Also, the usefulness of both the RSM and ANN tools in the accurate prediction of the regression mod- els were revealed, with values of R-sq being 0.93 and 0.98 for RSM and ANN respectively
Investigating the potential of Calophylluminophyllum plant base oil for oil and gas drilling mud operations
The environmental and cost advantage of non-edible plant oil for potential base oil in oil
and gas drilling mud formulation is a drive for its use. The seed of Calophylluminophyllumthe plant oil
was processed, pulverized, and oil extracted using chemical method. The extracted plant oil and
commercial synthetic oil was used to formulate drilling mud and comparative analysis were made
using the physicochemical properties of the oil samples, mud rheological properties under sixteen
hours and 240 °F aging and non-aging effect for a 7 and 9 g viscosifier, and rheological models in
describing the mud. The commercial synthetic oil and Calophylluminophyllum oil shows a flash point
of 101 ± 0.1 and 164 ± 0.1; density of 108 and 172 ���
�3� ; viscosity index of 192 and 163; acid value
of NIL and 24.24; and oil yield of NIL and 71 % respectively. The rheological properties of
Calophylluminophyllum oil-based mud were higher than the synthetic oil-based mud. It was also
observed that the increase in temperature and viscosifer decreases and increases the rheological
properties respectively of all mud samples. The synthetic and Calophylluminophyllum oil-based mud
increased in the rheological properties after aging test. In the overall estimation of the root mean
square error (RMSE) values, coefficient of determination (�2) values, and the fitted plots analysis.
The Herschel Bulkley and the Sisko model had a much better description in predicting the
experimental data for the synthetic oil-based mud. The hyperbolic, Herschel Bulkley and Sisko model
had good description for the experimental data of the Calophylluminophyllum oil-based mud
Evaluation of Permeability Impairment Due to Surfactant Flooding
In the course of chemical flooding of crude oil reservoirs with surfactants,
retention of surfactant particles in the pores of the reservoir rock can cause a major reduction
of the reservoir permeability. This can cause serious problems thus unfavourably influencing
the economics of oil recovery. An appropriate assessment of the reduction in permeability is
essential for the recovery of hydrocarbons. During tertiary recovery of crude oil, a critical
evaluation of formation damage is necessary to evade operating costs, as the reservoir rock is
extremely sensitive to chemicals injected. The extent to which permeability is reduced cannot
be comprehensive for core field scales; it is consequently paramount to study the reduction in
the permeability of a core at laboratory scale before field scale estimation. In this paper, an
experimental investigation on the reduction in permeability after surfactant injection cores is
presented. Surfactants were used to flood the core samples. The permeability of the cores was
calculated at the beginning and end of every flood by measuring the differential pressure
during surfactant flooding of the cores. From the results, it is evident that there is a strong
influence of surfactants on the process of adsorption on reservoir rocks and consequently
leading to reduction in permeability
Twenty-first century technology of combating wildfire
Wildfire causes havoc and serious destruction of forest resources and wildlife. It also causes
occasionally serious damages to human lives and properties. Current technology of fighting wildfire employs
fire retardant chemicals, which pollute the environment seriously, and damages both wild and aquatic lives.
Based on the new novel technology, it is possible that in the near future the industrial emissions that pollute the
environments and cause health problems would be completely captured in frozen solid forms of emissions
products. One of these is the frozen carbon dioxide, which is known as dry ice, which would be available than in
hundreds of millions of tons in any country. Cost analysis shows that the power and cement industries would
significantly benefit by selling the dry ice captured using the technology, just at $0.07 per kg. The present paper
discusses the new technology of applying dry ice that would thus be abundantly available in fighting a wildfire.
The paper discusses how the new technology would be by far superior to current technology that employs fire
retardant chemicals in terms of environmental protection and the cost-effectiveness over the current technology