ABSTRACTIncreasing oil recovery has been one of the issues enlisted for attention in oil producing countries around the world for past decades. So many forms of oil recovery techniques have been considered; infill drilling of new wells, production and injection control, pressure control, water flooding and other methods of Enhanced Oil Recovery (EOR), most of which have been implemented in other parts of the world. Nigeria as an oil producing country has not taken interest in EOR techniq...
ABSTRACT The use of horizontal wells with zonal isolations is a common completion practice in the oil and gas industry to check for very significant production challenges such as wellbore damage/skin, early water breakthrough and gas coning, rapid pressure depletion, dampened recovery efficiency and overall well productivity. Notwithstanding, the use of zonal isolators invariably alters the transient pressure response of horizontal wells. In this research, the use of well test analysis h...
ABSTRACT A major drawback of directional and horizontal well drilling is the numerous complex computations required to be done while planning a well. These computations are very stressful and time consuming especially when done manually. One of the objectives of this study was to develop a user friendly Excel Spreadsheet program that would make the computations of these well trajectory parameters easier, faster and accurate. An Excel Spreadsheet program was developed employing the Mini...
ABSTRACT This study investigated transient flow response of heavy oil that exhibit Bingham fluid characteristics. Four wellbore conditions in naturally fractured reservoirs were considered which include horizontal well, hydraulically fractured well, partially penetrating and fully penetrating vertical wells. Physical models were established and corresponding mathematical models were presented taking cognisance of minimum threshold pressure,𝜆𝐵. The model was solved analytically by ...
ABSTRACT Waterflooding is one of the most common secondary recovery mechanisms available for improving oil recovery from known accumulations. Due to the limitation of available water for injection, there's a need to optimize the use of this limited resource. To this end, a methodology has been developed to allocate injection water to more efficient wells than to those of lower efficiency. Streamline simulation is a complementary tool to conventional finite difference simulation, provid...
ABSTRACT Pipes that make up oil and gas wells are not vertical but could be inclined at any angle between vertical and the horizontal which is a significant technology of modern drillingExperimental data on time varying liquid holdup for and pipe inclination angles were analyzed and interpreted. Parameters such as void fraction, slug frequency, lengths of liquid slug, Taylor bubble and slug unit, structure velocity and pressure drop were calculated from the experimental data. It was obse...
ABSTRACT Cuttings transportation during in non-vertical boreholes is necessary for oil and gas wells. Adequate cuttings removal from a well in drilling is critical for cost-effective drilling as high annular cuttings buildup often leads to high risk of stuck pipe, reduced rate of penetration and other impediments to standard drilling and completion procedures. This study investigates how rheological parameters influence the removal of cuttings in non-vertical boreholes. It contributes ...
ABSTRACT Upstream petroleum industry remains one of the most prolific industries in terms of technology and risk capital transfer. Consequently, governments all over the world try to formulate political as well as economic structures that could favourably attract investments to their petroleum provinces. These structures are spelt out in their petroleum fiscal systems. A good fiscal system tends to find a common ground for both government and the contractor by way of optimizing both effo...
ABSTRACT Down-hole temperature and pressure data are important information needed to understand flowing conditions and production optimization. For example, knowing the wellbore temperature profile is useful in predicting the wax formation in the tubing, which is important in flow assurance. While gas production usually causes a temperature decrease due to Joule Thomson effect, water entry results in warming of the wellbore. Warmer water entry is as a result of inflow from a warmer aqu...
ABSTRACT The purpose of this study is to develop an innovative technique for optimized gas lift design for marginal fields of the Niger Delta. This study used well data from mature fields located southwest of the Niger Delta to develop optimized gas lift design techniques using the single point continuous gas lift approach. A total of fifty-nine (59) wells from the fields were selected for preliminary screening as potential gas lift candidates. The screening process involved; revie...
Abstract Globally, 30–50% of hydrocarbon volumes in silici-clastic reservoirs are contained within the thin-bedded pay. In the Niger Delta deep water assets, over 30% of in-place volumes are found within the complex turbidites. The presence of multi-pore architecture within such facies makes their description from petrophysics very complex. With the quest for hydrocarbon prospects in frontier deep water settings characterized by such complex rock fabric, detailed reservoir characteriz...
ABSTRACT In this study, we present a new analytical solution method that accurately corrects the non-isothermal effects from injection and fall-off tests. The derivative of these solutions is applied to develop the Tiab's Direct Synthesis (TDS) technique. New equations have been developed to determine the different reservoir parameters from pressure injection/fall-off test data. The flow regimes that can occur during an injection test or fall-off test are obtained by separating the diffe...
ABSTRACT Reservoir characterization has long been identified as the ultimate process employed in detailed description of a reservoir in order to properly book the reserve and also to optimally place the wells and drain the reservoir. This report details the workflow of reservoir „X‟ study, right from 3D seismic interpretation to delivery of a 3D static model of the reservoir by fully integrating all the available data in the field: 3D seismic data, well logs, deviation data, core d...
ABSTRACT The design of natural flow and artificial lift tubing strings for the whole life of a water drive reservoir was carried out using data based on synthetic reservoir performance based on a material balance. The effects of reservoir properties on the life of the well was also investigated. Constraints such as maximum production, maximum drawdown, limitations on surface facilities capacities, as well as available gas lift was imposed. The production conditions for natural flow, con...
ABSTRACT Simplified predictive numerical models have been developed for diffusion rate of crude oil spilled into Niger Delta soils. The proposed model equations were developed using Fourier transformation, and Green’s function. The induction principles as well as the indicial matrix method of dimensional analysis were adopted in determining the functional parameters that could possibly influence their diffusion rates. These mathematical models correctly p...