Scholarly works in Petroleum engineering
Permanent URI for this collectionhttps://repository.ui.edu.ng/handle/123456789/564
Browse
125 results
Search Results
Item Conversion coating pretreatment enhances pipeline integrity(Open Science, 2018) Makanjuola, O.; Adediran, A. A.; Ogunsemi, B.; Akintola, S. A.; Ebitei, C.It is necessary to coat both the internal and external surfaces of pipelines which transport different types of fluids that are usually contaminated with various percentages of aggressive corrosives. Pipelines pass through various terrains and highly challenging environments hence the need for both internal and external coatings to prevent corrosion and its adverse effects. In order to improve on the longevity of pipelines and the adhesion of the coating system, it is preferable to conversion coat blasted surfaces prior to application of any coating system. Improvements in pipeline coatings applications and the often neglected chromating procedure prior to coating application have been highlighted. This will prolong the lifespan of pipeline networks and secure these strategic assets from being a source of both materials and human resources drain pipes. However, the use of corrosion resistant alloys as internal lining for carbon steel pipes in the petroleum/gas industry is fast gaining recognition.Item Prediction of generalised and localised Carbon steel corrosion using improved Norsok and Papavinasam Models(Sciencedomain International, 2017) Falode, O. A.; Akintola, S. A.; Akinlade, I. A.In this study, Norsok and Papavinasam models have been improved so as to reduce the model limitations. The Norsok model was improved by accounting for 3 phase flow in calculating the wall shear stress and correcting for oil wetting and formation of protective layers in steel pipes during hydrocarbon transportation while the Papavinasam model was improved by using the Weibull distribution to account for time effect in corrosion predictions. The corrosion rates predicted fairly agreed with the field values. The improved models are user friendly and readily available and thus applicable for corrosion studies in the oil and gas industry.Item The prospect of using palm wine as a fluid loss control agent in water based drilling mud(Avanti Publishers, 2016) Akintola, S. A.; Isehunwa, S. O.; Oboh, S. M.The need to advance and project the use of local materials as suitable drilling fluid additive in the oil and gas industry in Nigeria led to the research on the possible use of palm wine and potash as additives in a water base drilling mud. A comparative study of these local materials (palm wine and potash) with imported foreign materials (lignite and caustic soda) as control were used in investigating the properties of a water base drilling fluid. A laboratory investigation of the effects of temperature and aging time on the properties of water-base drilling fluid is made with Fann Model 800 High Temperature and a High Pressure (HTHP) Viscometer, according to the API recommended standard practice. The results obtained showed similarity in the drilling fluid’s rheological and filtration properties; mud weight and pH values for both local and foreign additives. The result from the mud sample prepared from the palm wine and potash had apparent viscosity, plastic viscosity and yield point decreasing steadily with increase in temperature for all aging time just as shown with the control sample, while the aging effect diminishing as the aging time increases. The potash was seen to have increased the mud pH from 7.0 to 12.9 pH units. The results, shows that both palm wine and potash can be used as suitable in water base drilling mud additive.Item Deconvolution and interpretation of well test data ‘masked’ by wellbore storage in a buildup test(American Journal of Engineering Research, 2015) Akintola, A. S.; Oriji, A. B.; Duru, K. M.When a well test contains a series of different flow rates, or a continuously varying flow rate, the combination of the pressure transients due to varying flow rate is called convolution. while deconvolution means removing a distorting effect upon the variable of interest. This paper is on the study of an analytical technique that can be used to explicitly deconvolve wellbore storage distorted well test data using pressure data and the flow rate. Then to determine the reservoir properties from this deconvolved well test data by using the conventional well test interpretation methods. Also the comparison of the material balance deconvolution method results with the β-deconvlolution method result were carried out and then used to determine which method was a better deconvolution tool. The results showed that the material balance deconvolution technique performed very well with minor discrepancies and gave better estimation of the reservoir parameters.Item Classical modelling of the effect of heterogeneity on reservoir performance of Agbada formation(Nova Science Publishers, Inc, 2015) Akintola, S. A.; Akinsete, O. O.; Akan, G. O.Understanding the basic mechanisms that govern flow of hydrocarbon in any given reservoir situation is necessary in developing reliable methods of predicting behaviour in that reservoir. Most reservoirs in Agbada Formation of the Niger Delta Basin are anisotropic and therefore heterogeneous, which is a vital parameter in the efficient production of hydrocarbons. This work looked at the effect of permeability anisotropy (Kv/Kh) or heterogeneous distribution and its effects on reservoir performance using windows based IPM-MBAL petroleum engineering software. Results analysis revealed that anisotropy makes reservoir production modelling more realistic than the isotropic scenarios, and degree of heterogeneity improves oil recovery from the reservoir (Kv/Kh = 1, R.F = 49.31%; Kv/Kh = 0.1, R.F = 49.95%; Kv/Kh = 0.001, R.F = 50.60%; Kv/Kh = 0.0001, R.F = 51.24%). Reservoir heterogeneity should be included in reservoir modelling practices because it has a significant effect on hydrocarbon production.Item Determination of some petrophysical properties of reservoir rocks in the Niger Delta(SCIENCEDOMAIN international, 2015) Akintola, S. A.; Akpabio, J. U.; Nduamaka, F. C.In formation evaluation, the knowledge of porosity, permeability and fluids saturation are very important in the determination of the hydrocarbon in place. These petro physical properties are necessary to understand the nature of the reservoir and help for proper field development planning. This was aimed at determining the petro physical properties (pore volume, bulk volume, grain volume, permeability and fluid saturation) of a reservoir from core plugs. A total of ten core plugs were used in this work. Archimedes immersion method was used in the determination of the bulk volume. Liquid saturation method was used in the determination of the porosity. The Dean-Stark extraction method was used in the determination of fluid saturation. From the results obtained in the core analysis, the sandstone reservoir has an average porosity of 14.9±5.1%, very good permeability with an average value of 349.77±0.3 mD and a very large water saturation value of 82±0.4%. Consequently the hydrocarbon saturation is approximately 18%. This implies that the formation is not commercially viable to develop based on the hydrocarbon saturation. The study shows that experimental work is one of the valid tools for making informed decisions on the development of a field in the petroleum industry and highlights the importance of the basic petrophysical properties in reservoir management.Item Field study of drilling bits performance optimization using a computer model.(American Journal of Engineering Research, 2015) Oriji, A. B.; Zakka, B.; Akintola, S. A.One of the major problems facing drilling operations is the performance of the drilling Bits. The ability of the Bit to crush the rock and the removal of the crushed rock from the wellbore effectively. It is necessary to understand the fundamental difference in Bit design for different rock textures because many variables tend to affect Bit optimization, particularly the type of formations, economics and Bit selection. However, the cost of drilling a well has a considerable effect on the selection and the design of a particular Bit, therefore this paper focuses on the development of a model that will predict future Bit performance and optimization for actual well design and construction. The variables to optimize Bit performance provide means of handling cost estimation hence the model becomes more realistic and dynamic in its application. The input variables and control factors for this model are stretched to minimize cost and maximize performance. The cost per foot and the break even calculations were done using data from the reference well X14 and also the evaluation well X35 from a field-X in the Niger Delta region. A Visual Basic dot Net program model was developed, tested and validated with the real field data to know its accuracy. The model interface shows the detailed application of the Bits in validating the data to provide the equivalent results for the five different Bits. Each set of the Bit record was ran separately on the software and the results for each application developed for comparison. In the software, data application were grouped into two distinct methods namely; rentals method and historical method. Under the rentals method, data were uploaded into the software and ran to generate results while the historical method was basically used for model prediction. The breakeven analysis provided a technique for calculating the performance required for an alternative Bit type to match the cost per foot of the current Bit. Based on the model results, Hughes Tungsten Carbide (HTC) Bit and Security Bit (SEC) used to drill well X14 and X35 were well optimized and should be encouraged in drilling wells within the area.Item Temperature and time-dependent behaviour of a water base mud treated with Maize (Zea mays) and Cassava (Manihot esculanta) starches(SCIENCEDOMAIN international, 2015) Akintola, S. A.; Isehunwa, S. O.Starch, one of the commonly used additives in drilling fluids, degenerates with time under cyclic temperature and pressure loads, causing changes in mud properties. This study was designed to establish the effect of temperature and aging on water base mud treated with starches prepared from maize (Zea mays) and cassava (Manihot esculanta) starches. The effect of potash and tannathin on the muds was also investigated. Plastic viscosity of treated samples at varying temperatures (24.4, 40.0, 60.0 and 80.0 O C) was determined using standard API practices over a period of 72 hours. At ambient conditions, the plastic viscosity of samples treated with maize and cassava varied between 5 and 7 cp and increased to between 6 and 12 cp when the samples were further treated with potash. Plastic viscosity for industrial starch varied from between 5 and 6 cp but increased to between 7 and 10 cp when further treated with potash. Predictive models for plastic viscosity and yield point gave coefficient of variance between 90 and 92% respectively. However, all the starches degenerated within 24 hours and would require further treatment to prevent biodegradation.Item Estimation of the refractive indices of some binary mixtures(Academic Journals, 2015) Isehunwa, S. O.; Olanisebe, E. B.; Ajiboye, O. O.; Akintola, S. A.Refractive index is a useful fluid characterization parameter with widespread industrial applications. The values for many pure liquids are known or readily available in literature. However, when experimental data are not available, the refractive indices of binary and multi-component liquids are often estimated from the pure components using mixing rules which are sometimes not accurate. This study was designed to measure the refractive indices and evaluate the accuracy of some commonly used mixing rules when applied to benzene-toluene, heptane-hexane, hexane-acetone, heptane-acetic acid and acetic acid-acetone binary mixtures at varying volume fractions and temperatures between 20 and 60°C. A simpler relation based on modified Kay or Arago-Biot mixing rule was demonstrated to have wider range of applicability because of the explicit temperature-dependence term.Item Investigating the effects of contaminants on the performance of oil based invert emulsion drilling fluid(Petroleum Technology Development Fund, 2014) Kumapayi, Y.; Bello, K.; Adekomaya, O.; Akintola, A.; Dala, J.; Mohammed, I.; Olafuyi, ODrilling fluid optimization is the main focus while drilling, this entails ensuring the fluid is at its right condition downhole at all time during drilling operation. The composition, including all additives added to the fluid must key into achieving the foremost goal of fluid optimization. Maintaining the integrity of drilling fluids downhole has become herculean especially at HTHP conditions. The possibility of fluid contamination at such prevalent downhole condition poses another major challenge to the fate of the drilling fluid. This work was undertaken to investigate the effect of clay and sea water (containing calcium and magnesium ions) contaminations on the rheology of the oil based invert emulsion fluid. Barite (Ba2SO4) was used as the weighting agent; the based fluid used for the oil based invert emulsion system was EDC-99, a specialized kind different from the conventional diesel oil. The fluid were analysed before and after aging using, rheometer, filtration and emulsion stability tests. From the experimental result, it was discovered that addition of contaminants lowered the electrical stability of the invert emulsion fluid. Fluid loss, Plastic viscosity, yield point and gel strength increased in the presence of contaminants. Only the plastic viscosity of the invert emulsion fluid was slightly out of API range for each set of contaminations, but this is still within the tolerance limit of an invert emulsion fluid with a S.G less than 1.61 [1]. Fluid Rheology stabilization after HT aging indicate the suitability of the fluid to be employed for downhole HTHP drilling that may take longer time.