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PVT and Flow course - Rate Equation (Darcy) Intro

Rate Equation (Darcy) Intro (20160308 Part 1) We are going to start by talking about Darcy's law. We're going to look at both for for liquid and gas. We'll use Darcy's law to derive what I'm going to call rate equations. Darcy's law gives you the velocity of a flow of fluid in a rock, we don't. . . more

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Gaslift in simple words

Think about it as a force balance equation. Your well is at certain depth. Your reservoir has a certain pressure. Your produced fluid (oil, water, gas) has a certain density, often described as a fluid gradient using psi/ft of depth. If your reservoir pressure is greater than the pressure of the. . . more

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PVT and Flow course - Black-Oil PVT

Black-Oil PVT (20160301 Part 1) Traditional black oil pvt is kind of what we talked about before, where you take the different Liberation tests data together with the multi-state separator test data, you could also include the constant composition expansion data above the bubble point to kind of. . . more

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Collaborative articles on LinkedIn

Collaborative articles are a new way to tap in to the collective knowledge of the LinkedIn community so averyone can learn from experts across professional topics. Collaborative articles are knowledge topics published by LinkedIn with insights and perspectives added by the LinkedIn community.. . . more

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PVT and Flow course - Lab PVT Tests CVD

Lab PVT Tests CVD (20160225 Part 1) The Constant Volume Depletion test. This test is mainly conducted on gas condensates, that's reservoir fluids with a dew point. And it can in a few cases be used for what we'll call very volatile or sometimes we refer to it as near critical oils - oils with. . . more

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PVT and Flow course - Lab PVT Tests DLE

Lab PVT Tests DLE The differential liberation experiment is conducted only for oils. It's the same process if you will as the SEP test BUT the temperature at each stage remains equal to the reservoir temperature. The whole experiment is going on at reservoir temperature. The number of stages. . . more

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PVT and Flow course - LAB PVT Tests Multistage SEP

A multi-stage separator test. Typically it's two to four stages, most common maybe in the old days was two stages. Reasons: They are really trying to find out what pressure and particularly temperature of the first stage gave the most stock tank oil. Basically you're taking a reservoir fluid. . . more

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PVT and Flow course - Lab PVT Tests CCE

The constant composition or constant mass expansion test. 1. CCE for oils, and in particular oils that a little bit lower gas flow ratio they're not so compressible, we could call it slightly compressible oils. If you took the the reservoir oil to the surface and flashed it down to stock tank. . . more

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PVT and Flow course - OBM Decontamination

OBM Decontamination Explained The talk about the oil-based mud contamination. When drilling with oil-based mud (OBM) the collected fluid samples are often contaminated by hydrocarbons originating from the oil-based mud. To obtain a proper measure of the in situ reservoir fluid the sample. . . more

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PVT and Flow course - PVT Lab Tests

PVT Lab Tests (20160216 Part 1) There are three fundamental things that are done in the laboratory: quality control or a check on the samples that were collected (the main concern if there's leakage from the samples that have been sent from the field to the laboratory). compositional analysis -. . . more

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PVT and Flow course - Sampling

There are three types of sampling methods that we're going to talk about: Open Hole Bottomhole Samples - Formation Tester (MDT|RCI|...) Surface Separator Samples Cased Hole Bottomhole Samples Sampling MDT Intro Openhole formation tester. The first version of this was called the repeat. . . more

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PVT and Flow course - Surface Separation Processing

Surface Separation Processing (Part 1 of 2) A lecture on surface separation. Information from chapter 6 of "Phase Behavior" SPE Monograph (Whitson and Brule). PDF of notes available here:. . . more

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PVT and Flow course - Flash Calculations

Flash Calculations (Part 1 of 2) A lecture over Flash Calculations and their applications to equations of state. Information from chapter 4 of "Phase Behavior" SPE Monograph (Whitson and Brule) PDF of notes available here:. . . more

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Sand Control, Pumping and Design - webinar

The webinar was presented by Amro Hassan, who spent 13 years with Haliburton as an Associate Technical Professional in hydraulic fracturing, acid stimulation, sand control, water/gas shut-in and coil tubing services. UCS (Uniaxial Compressive Strength) The first thing we need to look at is the. . . more

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Petroleum - Modern history of oil on a Map

Let's retrace on an animated map a summary of the modern history of petroleum. <html> tags cannot be used outside of normal pages.. . . more

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PVT and Flow course - K Values

K Values - Part 1 Phase equilibrium We are talking about having a some volume at some point in the system: reservoir and the production pipe going to the surface or at the surface gathering pipe lines maybe, at the separator, basically at some point in the system having a known pressure and. . . more

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PVT and Flow course - Multi-Component Phase Diagrams

Multi-Component Phase Diagrams - Part 1 10 - 20 components is a very simple gas, very boring kind of gas, but much more often in the great majority of reservoir fluids will contain hundreds if not thousands of different compounds hydrocarbon compounds. The calculations of flow through reservoir,. . . more

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PVT and Flow course - Two-Component Phase Behavior

Now we're going to look at two components together and see how things change in regard to the the mapping of the pressure-temperature or space where you have two phases. So, here we have a pressure temperature diagram again and on this diagram there is the vapor pressure curve of methane and the. . . more

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PVT and Flow course - Single Component Vapor Pressure.

Pressure - Temperature diagram is a map of the pressure temperature space where you'll find one phase, we might be calling it an oil (liquid) or a gas (vapor) and the PT space where two phases or both oil and gas coexist. Pure Component Phase Diagram The line separating the liquid and gas. . . more

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Industry Stories - on a smart PVT guy

In the USA in some states define gas reservoir and oil reservoir based on GOR. If GOR is greater than a certain value they call it a gas reservoir and if it's less than that they call it an oil reservoir. The consequences it has it says that if we call it a gas reservoir you get one well in that. . . more

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PVT and Flow course - Gas or Oil Reservoir?

Whitson Academy is probably one of the most useful YouTube channels for petroleum engineers. The 2016 PVT and Flow Course is a great series of lectures. And here I'll summarize the main ideas from the videos. Gas or Oil Reservoir? Part 1 Sometimes it is really hard to tell if it is a gas or an. . . more

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Troll Field History

Interesting, but Troll Field, one of the largest oil fields on the Norwegian continental shelf (in 2002 oil production was more than 400,000 barrels per day), was not considered an oil field at all when it was discovered. When Shell discovered the field, they knew there was oil there, but they. . . more

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Corey function

Corey functions are a type of relative permeability model used in multiphase flow in porous media. The Corey correlation is a power law in saturation and assumes the wetting and non-wetting phase relative permeabilities to be independent of the saturations of the other phases. The Corey. . . more

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How to use Arps Decline Curve Analysis on Petrofaq Tools

Tools:ArpsDeclineCurveAnalysis allows you to: Analyze the decline curve using the Arps method. Find the coefficients for exponential, harmonic and hyperbolic declines Predict the production rate How to use Paste the production into Production per timestep section. The timesteps will be generated. . . more

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Decline Curve Analysis (DCA) with Python

Hello everyone! In this tutorial, we're going to write a simple Python script to analyze decline curves for oil and gas wells using the Arps method. Here is the DCA theory. You can find the implementation of the script in Petrofaq Tools: Tools:ArpsDeclineCurveAnalysis First - let's add the. . . more

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Open Public Datasets for Machine Learning in Geoscience

The best open source geoscience datasets for applying data science, machine learning and petrophysical techniques https://towardsdatascience.com/public-datasets-for-machine-learning-in-geoscience-cf880862300a. . . more

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What is preprocessing and postprocessing in reservoir simulation?

Sometimes old school reservoir simulation engineers talk about pre-/post processing. What does it mean? Preprocessing is just building the model - preparing DATA file with information (configurations; reservoir, PVT, SCAL data, wells, etc.) Postprocessing is results analysis - view the 3D. . . more

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Crain's Petrophysical Handbook

E.R. (Ross) Crain, is a Professional Engineer specializing in the science and application of Integrated Petrophysics. He brings petrophysics, reservoir engineering, geology, and geophysics together in a coherent, easy to understand, rock-physics model using the Log Response Equation and the. . . more

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Volume at standard and reservoir conditions

Sm3 or Rm3? Sm3 means m3 at standard temperatue and pressure (590F/14.5038 PSI or 150C/100 kPa by SPE Standard, but there are other reference conditions in current use). Rm3 means m3 at reservoir conditions. The same for barrels: STB/day, RB/day.. . . more

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Absolute and gauge pressure

What is the difference between PSIA and PSIG? PSI stands for spounds per square inch, it is a unit for measuring pressure. A means absolute. Absolute pressure is the pressure relative to zero or absolute vacuum. G means gauge, that is what pressure gauge measure. Gauge pressure is the pressure. . . more

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Benchmarks cases on reservoir studies from Unisim

Here is a colletion of reservoir studies: https://www.unisim.cepetro.unicamp.br/benchmarks/br/. . . more

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Landmark Exploration Handbook

The Exploration Handbook from Landmark is a compilation of subsurface evaluation techniques written by a team of experts with decades of experience in exploration geology. Get your copy from https://www.landmarksolutions-us.com/exploration-handbook/. . . more

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Calculation of Downhole Dynamometer Cards for Sucker-Rod Pumps: MATLAB code

Finite-Difference Wave Equation Diagnostic Analysis for Sucker-Rod Pumps Based on Everitt and Jennings method: An Improved Finite-Difference Calculation of Downhole Dynamometer Cards for Sucker-Rod Pumps - Everitt and Jennings. . . more

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Python libraries: pyResToolbox

pyResToolbox is a collection of Reservoir Engineering Utilities written in Python. Includes functions to perform simple calculations including: Inflow for oil and gas PVT Calculations for oil PVT calculation for gas Creation of Black Oil Table information Creation of layered permeability. . . more

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Statistics on blowouts occurrence by operational phase

The SINTEF Offshore Blowout Database totally includes 702 offshore blowouts worldwide (November 2021). Data from the US Gulf of Mexico Outer Continental Shelf (US GoM OCS), Norwegian and UK waters are in general better documented than blowouts from other regions. The database and annual report are. . . more

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Python libraries: Two-phase flow and CoolProp

Two-phase flow The two-phase flow is a Python library that implements two-phase flows models and make easy to get the flow properties such as flow pattern, elongated bubble velocity, homogenous model properties etc. This library is structured in a way that the user can program using a simple and. . . more

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Have you ever seen hydrate?

The video of the hydrated well. <html> tags cannot be used outside of normal pages.. . . more

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Python for Geoscience

Learning Python for Geoscience, including: Windows / Linux setup Getting started with Python Using Python Subsurface Tools Geospatial Analysis in Python Back to basics with data and statistical concepts for data analysis Well data exploration, from geothermal production to well logs <html>. . . more

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XTGeo - Python library for G&G from Equinor.

XTGeo is a LGPL licensed Python library with C backend to support manipulation of (oil industry) subsurface reservoir modelling. Typical users are geoscientist and reservoir engineers working with reservoir modelling. XTGeo main environment is as stand-alone Python script or notebook, but can. . . more

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Whitson wiki

The whitson wiki from Whitson, The PVT Company contains a collection of topics, results of work over 40 years. This wiki is meant to help anyone with an interest in PVT, Gas EOR, Gas Condensates, and Tight Unconventionals. https://wiki.whitson.com/. . . more

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FutureGen 2.0 Technical Data

Resource on Energy Data eXchange from the FutureGen project that provides 2D seismic lines, well logs, gravity data, fluid-logging test, pressure monitoring, reservoir geomodel, shapefiles, core photos, reports, and many more. This is a comprehensive collection of all original surface and. . . more

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Golden rule of decline curve analysis (DCA)

The basic assumption in this procedure is that whatever causes controlled the trend of a curve in the past will continue to govern its trend in the future in a uniform manner. [1] This rule means that any change in the behavior of the reservoir or well (the beginning or change in the. . . more

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Geoapps GitHub repo

Open-source application in geoscience with Geoapps. Check out the Geoapps GitHub repo; it contains several python applications in geoscience with visualization, runs in Jupyter notebook. The geoapps project has been created by Mira Geoscience for the development and sharing of open-source. . . more

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Learn from Penn State University, College of Earth and Mineral Sciences

Very helpful free recourses from Penn State College of Earth and Mineral Sciences: https://www.e-education.psu.edu/png301/node/2 - Introduction to Petroleum and Natural Gas Engineering Overview: PNG 301 covers the basics of petroleum and natural gas engineering, including terminology, equipment. . . more

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Solution Manual For Applied Petroleum Reservoir Engineering by Craft

The collection of solutions of applied petroleum reservoir engineering problems. https://issuu.com/kokikuw/docs/pdf. . . more

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Oil Men - Tales From the South Texas Oil Patch

OILMEN: Tales from the South Texas Oil Patch tells the story of the oil and gas industry and how an accidental discovery in 1854 transformed a once untamed frontier into what is now one of the richest oil producing areas in the nation. This one hour documentary depicts the risky adventures of early. . . more

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Gases on Crash Course Chemistry

Talks about gases on Crash Course Chemistry. The Ideal Gas Law Gases are everywhere, and this is good news and bad news for chemists. The good news: when they are behaving themselves, it's extremely easy to describe their behavior theoretically, experimentally and mathematically. The bad news. . . more

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SPE Data Repository

The SPE Bleeding Edge of RTA group (BERG) is collecting data from industry partners to make available for use for training, research, publishing and development. The sole stipulation to its use is that it is properly referenced when used in an internal or external document or published work. This. . . more

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The Open Group OSDUTM Data Platform Mercury Release (R3) now available

The Mercury Release of the OSDU Data Platform is the result of a collaborative project to deliver an industry developed Open Source solution to meet the needs of the energy industry. This first production release of the OSDU Data Platform is available to anyone who wants to: Have a single data. . . more

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What is the difference between bubblepoint and dewpoint?

Both bubblepoint and dewpoint are saturation pressures for mixture of hydrocarbon and non-hydrocarbon components. At a given temperature, the condition occurs when an oil releases an infinitesimal bubble of gas from solution when pressure drops below the saturation pressure. This pressure called. . . more

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Petroleum Engineering @ Top Dog Engineer

Brandon Tolbert, an engineer, worked at some of the biggest companies in their respective industries including ExxonMobil, Boeing, and Raytheon. He created Top Dog Engineer where he write about Petroleum Engineering. https://topdogengineer.com/petroleum-engineering/ His Youtube. . . more

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Campbell Tip of the Month

Campbell Tip of the Month is a blog from John M. Campbell | PetroSkills. John M. Campbell | PetroSkills is one of the most distinguished providers of facilities training in the oil and gas industry. Since 1968, John M. Campbell & Co., also known as JMC™, has been building reputation with. . . more

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Integrated Field Development using Schlumberger software

Still today over 90% of field development plans fail to fully predict reservoir behavior, resulting in expensive retro fits of the infrastructure, the introduction of unforeseen well expenditure, and the implementation of secondary recovery mechanisms late in the phase. The economic impact with. . . more

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Back allocation from Tachyus

Fully automated hydrocarbon back allocation using physics embedded machine learning, integrating well test, pressure and temperature data of your surface network. Sign up for a 30 day free trial https://www.tachyus.com/surfacebackallocation/index.html Estimate daily oil, water and gas production. . . more

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Frac-Base™ by Interface Interactive Fracturing Fluid Database

Interface Fluidics is transforming how the energy industry gathers and uses fluids information to enable better decisions to be made in the field. Interface’s testing technology gives the ability to observe how fluids behave at the pore-scale and provide critical phase behaviour information for. . . more

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Natural Gas Quiz

Check yourself at http://naturalgas.org/quiz/ disclaimer: the quiz is from 2013 and may be outdated.. . . more

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What is the difference between ASPEN HYSYS and ASPEN PLUS?

The difference is that HYSYS is flow based while Plus is process focused. Thus Aspen Plus is quite good at simulating non-ideal properties, systems with electrolytes, solids, azeotropes, and chemical reactions. While HYSYS is optimized for upstream oil & gas, gas processing, and refining. . . more

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What PVT model to use for reservoir simulation. Black oil or Compositional?

Check this table: Reservoir Fluid Process Black Oil model EOS (compositional model) Black Oil (Missing Intermediate Components) Primary Depletion/Waterflood usual choice possible but less likely Gas Injector (Separator Gas) well suited possible but less likely Enriched Gas. . . more

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Baker Hughes Rig Count

The Baker Hughes Rig Counts are an important business barometer for the drilling industry and its suppliers. When drilling rigs are active they consume products and services produced by the oil service industry. The active rig count acts as a leading indicator of demand for products used in. . . more

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The Oil and Gas Authority (OGA) presented resource map

A new interactive mapping application that reveals the location of every energy-related site in the UK Continental Shelf (UKCS) is expected to bring real benefits for exploration and the search for carbon storage locations. The game-changing app shows the proximity of existing oil and gas. . . more

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Modeling or simulation?

Usually term modeling is referenced to static, geologic models (see for example Common Workflow for Geological Modeling). And simulation referenced to dynamic reservoir models. But this is not very strict.. . . more

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What is Peaceman’s formula?

In reservoir simulation to calculate fluid inflow pressure drop (reservoir pressure - BHP) required. The pressure equivalent radius of the grid block is defined as the distance from the well at which the local pressure is equal to the nodal average pressure of the block. In a Cartesian grid,. . . more

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Do you use data-driven models?

Some engineers do not trust Dig Data in petroleum engineering. They say it is impossible to predict production using models that do not take into account reservoir properties. But at the same time, models limited only to production data are well known in the industry for many years. They called. . . more

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Halliburton and Honeywell have formed a partnership

Halliburton and Honeywell have teamed up the best of their technologies, people and process to fundamentally transform hydrocarbon recovery and asset performance by creating a true surface/subsurface digital twin that comprehensively integrates the entire value chain. Hydrocarbon recovery is a. . . more

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How to learn software?

Of course, there are paid instructor led courses. But many users greatly underestimate the help that comes with software. Almost all commercial software packages come with user manuals, technical descriptions, and data sets. Sometimes there are step-by-step trainings. Just check it out next time. . . more

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OLGA 101 – The (my) Basics by Andrew Amaechi Halim

I’ve attended a couple of OLGA courses (see here) both when it was owned by SPT and after it was bought by Schlumberger. On my first course I was like the proverbial deer in headlights, I thought the instructor was speaking “magjugunsi” (an imaginary language I used to speak when I was a. . . more

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Feedback

Feedback, questions, suggestions, etc please leave in comments or email: petrofaq.org@gmail.com. . . more

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Welcome to Petrofaq blog!

Welcome to our blog! Petrofaq is created to summarize and share knowledge about petroleum engineering. The best way to do this is to use Wiki articles. But at the same time we want to share news and thoughts and we can't find a better solution than the blog. So we'll try to combine both formats to. . . more

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