ABSTRACT The wellbore integrity plays an important role in petroleum operations like drilling, well completion and production. Caliper, Electrical image logs, Acoustic televiewers (ATV) and Optical televiewers (OTV) are some of the devices currently used in the industries to identify breakouts. However, these techniques are restricted in applications. For instance; caliper sometimes indicates the effect of drill spiral grooves as borehole enlargement zones, poor resolution, and complicated p...
ABSTRACT Determination of optimal well locations for infill drilling is a challenging task because engineering and geologic variables affecting reservoir performance are often nonlinearly correlated and have some degree of uncertainty attached to them. Numerical models which are the basis of well placement decisions rely on data that are uncertain, which in turn translate to uncertainty in our numerical simulation forecasts. The objective of this research is to employ an efficient optimizati...
ABSTRACT Without accurate estimation of annular pressure losses it is possible to face serious problems that would yield to interruption in drilling operation and sometimes lead to the abandonment of the well. Therefore, exact estimation of annular pressure losses is vital in drilling and well completion operations to control formation pressure and optimize drilling and completion fluids hydraulic program. Many investigators have proposed different equivalent diameter concept to provide a si...
ABSTRACT The research is aimed at the understanding of the various diagnostic plots for the analysis of water production that are available as well as the application of these methods in a case study. It also aimed at the establishment of a work flow for the evaluation of water production mechanisms. A workflow was developed that combines numerical simulation and diagnostic plots to analyze the water production performance in a reservoir. This workflow was validated using a case study. The m...
ABSTRACT Petroleum Fiscal System (PFS) is a major determinant of investment decision in the exploration and production of oil and gas in any country. It basically describes the profitability relationship between the host government of the producing community and the International Oil Companies (IOCs). The comparative analysis of the performance of the fiscal regimes becomes imperative as it affects the interest of the investor and the production of oil and gas. During the formulation of any ...
ABSTRACT Maximum production from an oil well can be achieved through proper selection of tubing size. The selection of optimum tubing size must be evaluated when completing a well in any type of reservoir especially solution gas drive reservoir since there is likelihood of producing more gas as the reservoir pressure declines. The most widely used methods such as Tarner, Muskat and Tracy methods for predicting the performance of a solution gas drive reservoir were discussed and used to estim...
ABSTRACT The practical application of various production parameters and relations to predict the well performance analysis of a solution gas drive reservoir is the primary objective of this study. These parameters include: IPR (inflow performance relation), OPR (outflow performance relation) and PI (productivity index). Theoretical data was used to predict the performance behavior of a solution gas drive reservoir from start of production till its abandonment. IPRs and OPRs were developed du...
ABSTRACT Petroleum fiscal regime defines the extent to which the host government and the prospective investor can apportion risks and share project rewards. Ghana’s petroleum industry has become an attractive place for most investors because the current fiscal regime governing the industry is based on old petroleum tax laws and systems. In this study the petroleum fiscal regime currently used in Ghana was modelled, reviewed and evaluated. A proposed progressive fiscal regime was then put f...
ABSTRACT This study presents an investigation of the hydrodynamics behaviour of slug flow in an inclined (80 degree inclination) and 67 mm internal diameter pipe. The study provides a more rudimentary explanation into the physical phenomenon that controls slug flows behaviour and the way these parameters behave under variable flow conditions. Various correlations for determining slug characterisation parameters have also been presented and validated with the experimental data. The slug ...
ABSTRACT A new method for analysing productivity index (PI) on vertical wells is the main objective of this study. Well performance is often measured in terms of the well’s productivity which is dependent on a number of factors such as the reservoir’s configuration, the type of completion, petrophysical and fluid properties, formation damage, etc. The effect of partial completion is the main focus of making the productivity index analysis since almost all vertical wells are partially com...
ABSTRACT From the inception of the oil and gas industry, water production has always been an aching problem for various operators. Throughout the productive life of a field, oil production is often accompanied with some amount of water production, which in most cases, is so significant and unwanted. Because of the great operating, environmental and economic challenges associated with excess water production, operators are in search for different methods and tools that could be used to identi...
ABSTRACT As reservoirs become more complex and drilling operations more expensive, the need to reduce both inefficiencies and costs for constructing and analyzing high quality static models is essential. The effective and efficient production of petroleum from a reservoir lies on the proper characterization of the reservoir. Once the static model resulting from reservoir characterization is satisfactory and heterogeneities taken care of, it is but evident that the uncertainties will be minimi...
ABSTRACT Successful oil and gas well drilling require hole stabilization. Barite comprised of barium sulphate is a common mineral chiefly used by oil and gas companies in their drilling operations. Barite is used in the drilling fluids to maintain the pressure in the wellbore and prevent intrusion of unwanted fluids from the formation being drilled. Most African countries hold significant reserves of barite but a number of challenges have limited local production resulting in poor quality wh...
Abstract Solution gas drive reservoirs are characterized by rapid and continuous decline of reservoir pressure. This rapid and continuous decline of reservoir pressure causes direct decline of reservoir performance at early stages of the life of the reservoir. The principal source of energy which is gas liberation from the crude oil and the subsequent expansion of the solution gas as the reservoir pressure is reduced are inadequate to produce such reservoirs to their full capacities. Ultimat...
ABSTRACT Well stimulation consists of several methods used for enhancing the natural producing ability of the reservoir when production rate declines. A detailed literature review of some of the well published stimulation models are discussed in this research. This discussion was preceded with an introduction to formation damage concepts and an overview of well stimulation methods. Production decline curve analysis is combined with economic discounting concepts to develop a model that can be...