To tune or not to tune BIP’s when lumping: That’s the question

EOS Component Lumping Optimization To reduce CPU time in compositional petroleum simulation models (e.g. compositional reservoir simulations), a minimum number of components should be used in the equation of state (EOS) to describe the fluid phase and volumetric behavior. A ″detailed” EOS model often contains from 20 to 40 components, with the first 10 components […]

Monthly Articles, News

whitson+ in the cloud … with diamonds

Author: Markus Blytt With the creation of Fortran during the 1950s and 1960s, computer science took a giant leap in the direction of popularizing the art of coding. Today, Fortran is considered an ancient language, mainly because of two things: (1) a wide range of much more high-level programming languages exist, making it easier for […]

Numerical RTA – What’s New?

Two common goals of Rate Transient Analysis (RTA) are the quantification of early time well performance using the Linear Flow Parameter (LFP), as well as Original Oil In Place (OOIP) volume being drained. These two parameters are essential for understanding the effects of completions, geology, and depletion which then advises different strategies for optimizing the […]

whitson and Cimarex initiate technical software collaboration

Houston — 23 September 2021 — whitson and Cimarex Energy Co. (NYSE: XEC) are pleased to announce the signing of a technical collaboration agreement related to reservoir evaluation software. The focus of the development is key reservoir characterization modules for tight unconventional wells. Background. Over the last four years, Cimarex has developed a novel multiphase […]

Numerical RTA JIP – What, When & Why?

By Mathias Lia Carlsen, August 2021 We are launching a joint industry project (JIP) related to the numerical RTA workflow proposed by Bowie & Ewert (2020) that will kick-off in Q4 2021. But what is “Numerical RTA”? Well, in short the workflow leverages a full-physics reservoir simulator to estimate key RTA outputs (e.g., LFP and […]

The Gas Huff-n-Puff PVT Experiment

By Mathias Lia Carlsen, July 2021 *This is a short-version of URTeC 5016 by Mydland, Carlsen and Whitson found attached to this article. Gas EOR in Tight Unconventionals The gas-based Huff-n-Puff (HnP) process is currently the dominating EOR process in tight unconventionals.  This has happened as a result of operators looking to find new ways […]

Monthly Articles, News

Molar Distribution Models Applied to Petroleum Reservoir Fluids

By Bilal Younus, July 2021 This article discusses two common molar distribution models – discrete exponential and continuous gamma – used to describe heavier components such as heptanes-plus (C7+) in petroleum reservoir fluids. A molar distribution model relates component molar amount (mole fraction) to molecular weight (MW). The discrete exponential distribution is used exclusively to […]

Should We Use Binary Interaction Parameters

By Markus Hays Nielsen, June 2021 The question we want to try and answer in this article is if there are any reasons for using binary interaction parameters (BIPs) as a part of our EOS model development. There are a few things that need to be addressed right away, namely what is meant by “using […]

Press Release

Cooperation Agreement  Whitson AS – FDC de Argentina Buenos Aires — May 17, 2021 — Whitson  AS and FDC de Argentina are pleased to announce the signing of a Cooperation Agreement to work on Enhanced Oil Recovery Projects for Unconventional Reservoirs in Vaca Muerta, Argentina. Whitson will provide its sound experience from US projects in […]

Flowing Bottomhole Pressures Calculations Using the Black-Oil PVT Model

By Stian Mydland, May 2021 The flowing wellbore pressure at the perforated interval, commonly referred to as bottomhole pressure (BHP | pwf) or sandface pressure, is a required input for all classical well-performance forecasting techniques. The BHP is available in real-time for wells having pressure gauges installed sufficiently close to the perforated interval. For wells […]