Monday, July 5, 2010

Petrophysical Course in RIPI

Petrophysical Uncertainty Analysis
Modern Logs
Cement Logs Evaluation
Geolog Basic
Geolog Advanced
Geomage (FMS, FMI, UBI, OBMI, ...)
DSI (Full Wave Sonic)

Pore Size Distribution from NMR

T2 is the logarithm mean of the ith bin
Rho is the pore size relaxivity parameter calculated from calibrasion of T2 with capilary pressure curves or SEM results. (defults: carbonate 1.6, sands 5)
Calculation of relaxivity parameter:

Synthetic Capillary Pressure from NMR

1) T2 is integrated .
2) New curve is rotated 90 deg.
3) Calibrated with capillary pressure data from core.
4) Propagate over the well.


Sunday, July 4, 2010

Well Logging and Formation Evaluation By Toby Darling

This hand guide in the Gulf Drilling Guides series offers practical techniques that are valuable to petrophysicists and engineers in their day-to-day jobs. Based on the author's many years of experience working in oil companies around the world, this guide is a comprehensive collection of techniques and rules of thumb that work. The primary functions of the drilling or petroleum engineer are to ensure that the right operational decisions are made during the course of drilling and testing a well, from data gathering, completion and testing, and thereafter to provide the necessary parameters to enable an accurate static and dynamic model of the reservoir to be constructed. This guide supplies these, and many other, answers to their everyday problems. There are chapters on NMR logging, core analysis, sampling, and interpretation of the data to give the engineer a full picture of the formation. There is no other single guide like this, covering all aspects of well logging and formation evaluation, completely updated with the latest techniques and applications. · A valuable reference dedicated solely to well logging and formation evaluation. · Comprehensive coverage of the latest technologies and practices, including, troubleshooting for stuck pipe, operational decisions, and logging contracts. · Packed with money-saving and time saving strategies for the engineer working in the field.

Product details:

Name: Well Logging and Formation Evaluation
Author: Toby Darling
Price: USD 72.95
Paperback: 336 Pages
Publisher: Gulf Professional Publishing (march 2005)
Language: English
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Petrophysics: Theory and Practice of Measuring Reservoir Rock and Fluid Transport Properties By Tiab

The petroleum geologist and engineer must have a working knowledge of petrophysics in order to find oil reservoirs, devise the best plan for getting it out of the ground, then start drilling. This book offers the engineer and geologist a manual to accomplish these goals, providing much-needed calculations and formulas on fluid flow, rock properties, and many other topics that are encountered every day. New updated material covers topics that have emerged in the petrochemical industry since 1997.
Product Details

Name: Petrophysics: Theory and Practice of Measuring Reservoir Rock and Fluid Transport Properties
Author: Djebbar Tiab, Erle Donaldson
Price: USD 165
Paperback: 880 pages
Publisher: Gulf Professional Publishing
Language: English

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Definition of Cut Off  for NMR Free Fluid in Laboratory

1- NMR & T2 Distribution in 100% saturated Sample (T2 original, blue curve)
2- Centrifuging : Movable fluid extracted and bound fluid remained
3- NMR & T2 Distribution in spun sample (T2 spun sample, red curve)
4- Defining Cut offs
Sandstones: 33 ms
Carbonates: 100 ms

Which porosities are comparable

DMR (Density Magnetic Resonance) Porosity

The problem of NMR measurements in gas reservoirs is that in Gas-bearing zones, total NMR porosity read much less than density-derived porosity.
Porosity derived from NMR alone suffers from the low hydrogen index of the gas and the long T1 polarization time of the gas when the data is acquired with insufficient wait time.
To provide a robust estimate of porosity, a method called Density-Magnetic Resonance (DMR) that combines density porosity and total NMR porosity was successfully applied to the  wells logged with NMR.
The DMR technique was able to produce a very good porosity estimation comparable to that measured on conventional cores.