Angolan Mineral, Oil & Gas Journal

Density and viscosity measurements for diesel-decanol-oxymethylene ether blends

Márton Virt, László Horváth, Máté Zöldy — Sat, 08 Apr 2023 00:00:00 -0300

Advanced fuels can be used as an alternative for conventional fossil fuels. Out of many promising candidates, alcohols and ethers are well-studied substances for application in internal combustion engines. This study investigates the possibility of decanol and oxymethylene ether usage in compression ignition engines. To use diesel-decanol-oxymethylene ether blends in diesel engines, the properties of the mixtures need to be close to diesel fuels. For this, the blending ratios need to be chosen carefully to ensure good ignitability, fuel delivery and atomization of the fuel. This study focuses on the density and viscosity blending calculations and compares the predicted results to the actual values. The used formulas are found to be the most accurate for binary blends, and the accuracy gets worse whenever there is a big difference in the properties of the components.

The Transient Pressure Techniques for Identifying Condensate-Banking

Tommaso De Pippo, Edgar Chiquito, Nazaré Hebo — Tue, 27 Jun 2023 06:33:37 -0300

Gas-condensate reservoirs represent a large part of the gas reserves in the world containing large amounts of hydrocarbons, but due to thermodynamic aspects and dynamic behaviour of fluids in these reservoirs, the production of resources presupposes a very complex activity that requires a broad understanding and mastery of various recovery mechanisms and reservoir engineering practices. In these reservoirs, when the pressure drops below the dew point pressure due to the production of its fluids, some liquid components emerge from the gas in the reservoir in condensate form and which over time accumulate in the vicinity of the well making the production activity very challenging for engineers. This accumulation of saturation of condensate decreases the relative permeability of the gas and intensifies in the vicinity from the well causing a block to the gas flow to the surface. Given the importance and the impact of this phenomenon on the productive capacity of the reservoir, becomes It is imperative to predict its occurrence in order to provide the control mechanisms and / or mitigation. This research is dedicated to studying transient pressure techniques as a way of identifying the condensate-banking phenomenon. To perform the experiments of this study it was necessary to use two types of software. The first software was the reservoir simulation, Eclipse, in the compositional model (E300), where reservoir and well tests were carried out. Then, the pressure transient test software, KAPPA-Saphir. With this study, it was possible to prove that by doing an analysis from the derivative curves of pressure the moment and circumstances in which Condensate-Banking occurs can be predict.

Prospects for Autonomy of Angola's Transformation Industry with Growth in Oil Refining, Meeting the Challenges of the World Energy Transition

Pedro Gelson Morais; Elvis Napoleão Queto Cardoso — Mon, 30 Oct 2023 00:00:00 -0300

To make the most of oil's energy potential, it must be submitted to a series of refining processes in order to be broken down into its various derivatives. Angola has more than 60 years of oil exploration and still has today, the refinery in Luanda that is of the "hydroskimming" type, whose activity is essentially geared towards producing fuel for the Angolan domestic market and without the capacity to meet the demand of the rapid national economic growth that has evolved over the last 14 years. For this reason, the first quarter of 2019, the Angolan State, via Sonangol, disbursed a gross value of around USD 221.4 million with the import of 397.5 thousand metric tons of oil refined products. Normally, the path most followed by producing countries to leverage the transformation industry is to invest in petrochemical companies to produce most of the products that serve as raw materials that leverage the other industries. However, once again we have refineries to produce the main materials for petrochemicals. On the other hand, the XXI Century poses to human societies this challenge of decarbonisation of the world energy matrix, which, according to the studies we carry out in different research centres around the world, points to the need to modify (revamp) oil refineries, when possible, to increase the production of oil derivatives with non-energy use (petrochemicals, lubricants, fertilizers. ...), process cargoes not based on fossil consumables (e.g. vegetable oils or pyrolysis oil in severe hydrotreatment) and reduce atmospheric emissions from refining processes^(1). In this sense it is necessary that the alternatives that lead to an autonomy for the growth of the transformation industry, such as the growth of the oil refining activity in Angola (being a producing country for over 60 years), and its extension to petrochemicals, should be adapted to the challenges of the world energy transition. Therefore, this study aims to present the perspectives and impacts of refining in Angola, as well as the suggestion of a refining industry model applicable to the Angolan reality, especially in order to enhance the position of the Angolan refining industry in the challenges of the global energy transition.

Using fuel station data to predict failures

Imre Zsombók, András Zsombók — Thu, 21 Dec 2023 00:00:00 -0300

In our study, we will show the potential of analysing the data generated by petrol station equipment, and how the data can be used to produce a historical summary, a statement, an analysis to help improve the system, or even a predictive model to help service operations.

The data used for the data analysis was made possible by the 2018-1.1.1-MKI - Supporting Innovation Activities of Micro and Small Enterprises - Development of a Fuel Vapour Leakage Monitoring System and Service Interface.