Tech Talks

Accurate fluid compositions are prerequisite to the development of reservoir fluid Equation of State (EoS) models; however, many studies have shown that compositions measured through GC have significant uncertainties in the amount of heavier carbon number fractions. In particular, the plus molecular weight and amount have a high degree of uncertainty, which can significantly impact …

#25 Addressing Compositional Uncertainty in EoS modeling Read More »

Introduction The simulation capability for Elemental mercury (Hg) distribution across vapor, liquid hydrocarbon, and water phases has been improved in PVTsim NOVA through the utilization of the original formulations of the Peng-Robinson 76/78 and Soave-Redlich-Kwong equations of state. A cubic modeling framework was deliberately chosen over specialized models for modeling Hg as the former allows …

#24 A Thermodynamic Model for Prediction of Solubility of Elemental Mercury in Natural Gas, Produced Water and Hydrate Inhibitors Read More »

The climate debate has made CO2 one of the most talked about substances. In the oil and gas industry, CO2 has always been important. Most reservoir fluids contain CO2, some in large concentrations, and CO2 is an efficient injection gas for EOR purposes. The properties of the hydrocarbon components are the same in a CO2 …

#23 Characterization of CO2 Rich Fluids Read More »

Reservoir fluid characterization is no longer limited to the classical steps of splitting the plus fraction into carbon number fractions, lumping of C7+ fractions, and assignment of EoS model parameters to the pseudo-components. An EoS model must be applicable not only in reservoir engineering calculations, but also in flow assurance and process calculations. Produced reservoir …

#22 Characterization of Fluids with Water Read More »

The two first TechTalks in the series on Fluid Characterization dealt with characterization of single petroleum reservoir fluids. This TechTalk outlines How to make a common equation of state (EoS) model applicable for multiple fluids How to add a new fluid to an existing EoS model How to evaluate whether a series of plus fluid …

#21 Common EoS Modeling Read More »

Taking a representative bottom hole fluid sample is a tedious and therefore also an expensive operation. Before a clean fluid sample can be taken, the well must be flooded for some time to remove the oil-based mud (OBM) in the near well bore area. Subsequently, a stable flow must be established from the cleaned well. …

#20 Dealing with Mud Contaminated Samples in EoS Modeling Read More »

Calsep will over the next couple of months post a series of TechTalks about simulation of fluid properties covering: Basic fluid characterization, Mud contaminated samples, Common EoS, Fluids with water, and CO2 rich fluids. This first TechTalk is about characterization of a single clean reservoir fluid composition. Fluid characterization was a hot topic in the …

#19 Reservoir Fluid Characterization Read More »

Introduction PVTsim has a comprehensive list of pure components covering not only oil and gas components, but also water, hydrate inhibitors and salts. Simulations may still be needed for mixtures with components that are not in the pure component database that comes with a PVTsim installation. In such cases, the user has the option to …

# 18 Adding a New Component into PVTsim Read More »

With the digital transformation well underway in the upstream oil and gas industry, standardized data formats are needed to support the exchange of data and other information while ensuring a high level of trust in the information shared. Anyone who has worked with PVTsim or other PVT software knows how tedious it is to enter …

#17 TechTalk on PRODML standard Read More »

Introduction A multiphase meter (MPM) is a cost-effective solution for reservoir fluid allocation. The meter provides gas and oil flowrates of a well stream at actual conditions. To take full benefit of multiphase meter readings, these meter flowrates must be converted to produced (Stock) oil and gas flowrates. Traditionally allocation calculations have been carried out …

#16 Multiphase Meter Black Oil Properties Read More »