ABSTRACT
Oil recoveries from medium and heavy oil reservoirs under natural recovery production are small because of the high viscosity of the oil. Normal water flooding procedures are usually ineffective, as the injected water bypasses much of the oil because of its high mobility. Thermal flooding processes are desirable but have many disadvantages from costs, effects on the environment, and loss of lighter hydrocarbons. Chemical flooding options, such as bio-polymer flooding options, are attractive, as they are environmentally friendly and relatively cheap to deploy and help to increase the viscosity of the injecting fluid, thereby reducing its mobility and increasing its oil recovery. The downside to polymer flooding includes reservoir temperature, salinity, molecular weight, and composition. Six weight percentages of two polymers (xanthan gum, XG, and gum arabic, GA) are dissolved in water, and their viscosity is measured in the laboratory. These viscosities are incorporated with correlations in the Eclipse software to create models with different polymer concentrations of (0.1% wt., 0.2% wt., 0.3% wt., 0.4% wt., 0.5% wt., and 1% wt.). A base case of natural recovery and water injection was simulated to produce an oil recovery of 5.9% and 30.8%, respectively, while at 0.1% wt. and 1% wt., respectively, oil recoveries of 38.8% and 45.7% (for GA) and 48.1% and 49.8% (for XG) are estimated. At 5% and 10% saline conditions, a drop in oil recovery of (4.6% and 5.3%) is estimated during GA flooding and (1.2% and 1.7%) for XG flooding at 1% wt., respectively. XG exhibits higher oil recoveries compared to GA at the same % wt., while oil recoveries during GA floodings are more negatively affected by higher saline concentrations.
ABSTRACT
BACKGROUND: Female genital mutilation (FGM) is a public health challenge and seems to be secretly practiced in some rural communities, despite the ban in Nigeria. OBJECTIVES: The study aimed to identify the activities that are involved in FGM, type(s) of FGM practiced and the knowledge of health implications of FGM among rural community members in Ebonyi State, Nigeria. METHODS: We employed exploratory design using qualitative technique. In-depth interviews were conducted with 44 adult (18 years and older) volunteers in four rural communities in Ebonyi State, Nigeria. After thematic analysis using NVivo 11 Pro software, eight sub-themes emerged, among which are: types of FGM practiced, seasons for FGM, FGM by health workers and community leaders, punishment for refusing FGM and knowledge of health implications of FGM. RESULTS: Findings show that FGM is more like a process than just an act, and type most practiced in the study area is Type 1. Circumcisers are health workers and women leaders. Knowledge of health implications of FGM was found to be low among those interviewed. CONCLUSION: Based on the findings, we concluded that FGM is still practiced in some rural communities in Nigeria, maybe because of poor knowledge of health implications of FGM.
