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FUTOSpace is the Federal University of Technology, Owerri open-access repository that collects, preserves and make available in digital format the intellectual output of the university's community:
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Recent Submissions
Reduction in annualar pressure loss by mud rheology control -a means of mud pump pressure control optimization: A case study of Niger Delta well
(International Knowledge Press, 2016-02-18) Onugha, Ifeyinwa N.; Igwilo, Kevin C.; Duru, Ugochukwu I.
This paper proposes two linear mathematical models for the reduction of annular pressure loss in a Niger Delta well- X, so that mud pump pressure is optimized. Data related to mud rheology, mud pump pressure, drill cuttings and the well geometry is available for well X which has already been drilled. The first linear model involves the reduction in pressure drop in the drill collar-casing annulus and the second linear model involves the reduction in pressure drop in the drill pipe-casing annulus. These models express reduced or critical annular pressure drops in terms of two mud rheological parameters- the yield point and plastic viscosity. For combined annular drill collar and drill pipe pressure loss, this paper proposes that the two linear mathematical models can be solved simultaneously to obtain optimum yield point and plastic viscosity of the drilling mud system to be employed for hole cleaning in the combined drill collar-casing and drill pipe-casing annulus. The Herschel Bulkley model is employed as the rheological model that represents the properties of the drilling mud system
analyzed and is generated for eight rheological cases each of the drill collar and drill pipe annular hole cleaning as well as two cases of the combined drill collar and drill pipe annular hole cleaning.
Modification of waste tire pyrolytic oil as base fluid for synthetic lube oil blending and production: Waste tire utilization approach. Journal of Material Cycles and Waste Management (Online First)
(Springer, 2020) Okoro, Emmanuel E.; Erivona, Nehemiah O.; Sanni, Samuel E.; Orodu, Kale B.; Igwilo, Kevin C.
This study provides an environmentally friendly process for the production of waste tire pyrolytic oil from fast pyrolysis for use in lube oil production. The produced waste tire pyrolytic oil was further distilled to provide an almost pure base fuid for production of lube oil. The distilled pyrolytic oil was further transformed to lube oil via polyol synthesis. Characterization of the distilled pyrolytic oil from waste tire pyrolysis shows that the oil after distillation contained 2.04 g/100 g of Aliphatic hydrocarbons, 1.96 g/100 g of naphthalene, and 5.99 g/100 g of parafn. The synthetic base fuid was blended with additive to obtain the desired lube oil. Based on the results obtained, the properties of the produced lubricant fall within the accept able criteria for standard lube oils/commercial lubricants. Six diferent blends (A–F) were produced using varied percentages of the selected additives and the base fuid, however, sample C gave the best lube oil blend considering its average density (0.97 kg/L), average viscosity which compares favourably with ISO viscosity (68 mm2/s) of class 68 oil at 40 °C with a fash point above 200 °C
A review of hydraulic work-over unit (HWU) application for well repairs in Nigeria
(U. P., 2014) Ohia, N.; Anayadiegwu, C.; Igwilo, K.
As part of efforts to encourage indigenous/local content in the area of work-over, re-completion and abandonment in Nigeria, Work over campaigns using a self elevating work-over platform (SEWOP) and a hydraulic work-over (HWU) unit was introduced in the year 2001. These projects provided an opportunity for Nigerian indigenous contractors to work closely with multinational companies with a view to develop expertise. Upon this platform was the services of the HWU introduced to the Nigerian oil & gas industry (for work-over, re-completion, well testing and abandonment) introduced to the Nigerian oil & gas industry. The initial objective of these campaigns was to equip older wells in the land and swamp locations with Surface Control Sub-surface Safety Valves (SCSSV) and top packers, in accordance with company’s well integrity management policy. This policy also required that some of these wells be abandoned to ensure the safety of the environment. It also presented an opportunity to carry out other well repairs and to install gas lift mandrels as the case may be. The projects’ priority factor (if compared with other income generating projects within the system) was low, especially for the abandonments. Hence, recognizing that funds are limited, the services of the HWU provided versatility and cost effectiveness .Between August 2001 and March 2006, a total of about fifty three wells were successfully worked on across the Niger Delta region in land, swamp and offshore locations. These series of operations were not without challenges considering the peculiar nature of the Niger Delta terrain in terms of operation and service delivery. Within the period mentioned above, a “learning curve” was developed for hydraulic workover that can be useful to operators in the oil and gas industry. In this paper, efforts have been made to describe this “curve” for the purposes of improving business results. This paper will also review significant cost saving achievements and challenges that were encountered during the entire period under review.
Adsorptive removal of methylene blue from aqueous solution using agricultural waste: Equilibrium, kinetic and thermodynamic studies
(U. P., 2015) Enenebeaku, K. Conrad; Okorocha, J. Nnaemeka; Akalezi, O. Chris
The potential of raw corn cobs (RCC) powder, for the removal of methylene blue (MB) dye from aqueous solution was investigated. The adsorbent was characterized by FTIR and SEM analysis. Batch adsorption studies were conducted and various parameters such as contact time, adsorbent dosage, initial dye concentration, pH and temperature were studied to observe their effects in the dye adsorption process. The optimum conditions for the adsorption of MB onto the adsorbent (RCC) was found to be: contact time (30mins), pH (10.0) and temperature (343K) for an initial MB dye concentration of 100mg/l and adsorbent dose 1.0g. The experimental equilibrium adsorption data fitted best and well to the Freundlich and Halsey isotherm models. The maximum adsorption capacity was found to be 18.28mg/g. The kinetic data conformed to the pseudo-second-order kinetic model, suggesting that the rate limiting step may be chemisorptions. Adsorption mechanism was investigated with intra-particle diffusion model and it indicated that intra-particle diffusion was not the rate determining step. Thermodynamic quantities such as Gibbs free energy (∆G0), enthalpy (∆H0) andentropy (∆S0) were evaluated. The negative values of ∆G0 and the positive value of ∆H0 obtained indicated the spontaneous and endothermic nature of the adsorption process while the positive ∆S0 value obtained indicated increased randomness during the adsorption process.
Analysis of the effects of millennium development goals (MDGS) projects on poverty reduction among rural dwellers in Owerri agricultural zone, Imo State-Nigeria
(Direct Research Publishers, 2017-03) Anaeto, F. C.; Achuko, G. U.; Chukwu, O.; Asiabaka, C. C.
This study focused on the effects of MDGs projects on poverty reduction among rural dwellers in Owerri agricultural zone. Data were collected using structured questionnaire administered to 108 respondents who were randomly selected using the multi-stage random sampling techniques. Data were analyzed using appropriate statistical tools such as frequency distribution, percentages, means, and mean scores based on the objectives of the study. Z-test was used to establish the hypothesized relationship. The results revealed among others that the rural dwellers were not very much aware of the MDGs projects, bore-hole and free education were very effective projects in reducing poverty among the respondents, while conditional cash transfer, supply of health facilities and construction of civic centers were not effective in reducing poverty among the respondents. Factors such as government policies, attitude of the leaders and ignorance affected the level of effectiveness of the MDGs projects. The z-test revealed that there was no significant difference between the existence of MDGs projects in Imo State poverty reduction level of both male and female rural dwellers. Thus the study concluded that much still needs to be done in using programmes such as MDGs in reducing poverty since the study shows that MDGs was just effective. The study thus recommends among others that there is need to sustain the effects of the MDGs projects on rural dwellers and ensure that the benefits are evenly distributed to all the rural dwellers and government