March 25, 2010


Description

Archie’s empirical equation is extensively used to estimate hydrocarbons in place.This power-laws combination has stood the test of time with little changes.However, it is still poorly understood and considered an ad hoc relation.Our original analysis will prove these laws rigorously, show how they must be amended, and introduce additional accompanying equations.This comprehensive model, which represents the electrical flow through the intricate conductive paths of the rock, is confirmed with Archie’s and Hamada’s core datasets.It corrects for Archie’s inaccuracies.

A thorough appreciation of the pore scale physics behind the modified version of Archie’s equation is presented.The principles can be applied in clean and complex formations (shaly-sands, thin beds, vuggy and fractured carbonates) to get enhanced values of water saturation.The theory sheds light on the role and quantification of anisotropy.

Solving for the elaborate pore geometry, we use the Laplace differential equation (not Ohm’s law), appropriate in the analysis of electrostatic fields in charge-free regions.Rock morphology dictates its boundary conditions characterized as corner angles.The corresponding particular solution (flow around a corner) and modeling tactic delineate the streamlines throughout the pores.The angles establish strong mathematical links among the exponents of Archie’s equation, the geometry of the rock frame and spatial fluid distribution.This quantitative method is lacking in previous saturation models.

The solution constitutes the basis to solve more complicated rock layouts.It enables the calculation of equivalent resistivities (normalized resistances) to take advantage of well-established electrical relationships.The extra equations compute the variable exponents and coefficients of Archie’s equation at every depth.They obtain the saturation exponent in clean rocks as function of water saturation, crucial to quality control core electrical data, and to quantify reservoirs under changing saturation (waterflooding).Therefore, improved calculations of original and remaining hydrocarbons are achieved.


Featured Speakers

Speaker Carlos F. Haro
Senior Engineering Advisor Occidental Oil & Gas Carlos Haro is a Senior Engineering Advisor working for Occidental Oil & Gas.He is one of the petrophysicist working Qatar, and other selected regions worldwide.He obtained a B.Sc. in Electronic Engineering from Escuela Politécnica Nacional, Quito, Ecuador, and a Masters in Petroleum Engineering ...

Senior Engineering Advisor
Occidental Oil & Gas

Carlos Haro
is a Senior Engineering Advisor working for Occidental Oil & Gas.He is one of the petrophysicist working Qatar, and
other selected regions worldwide.He
obtained a B.Sc. in Electronic Engineering from Escuela Politécnica Nacional, Quito, Ecuador,
and a Masters in Petroleum Engineering from Texas A & M, College Station.He has worked for NASA, Schlumberger and
Occidental Oil & Gas, with an overall petroleum industry experience of more
than 31 years.


His current interests
include the effective application of formation evaluation techniques to
geological and simulation models, by means of synthetic production logs,
productivity indexes, IPR’s and decline curves, all generated from standard
well-logs.Then, this information can be
compared and validated with actual acquired production data.


He is a member of SPE and SPWLA. He has written a few papers mathematically connecting
Archie’s and Carman-Kozeny equations for the calculation of permeability, and
to explain hydraulic and electric flow within the rocks.He has also published a theoretical solution
for shaly formations.

Full Description



Organizer

Kris Pitta


Date and Time

Thu, March 25, 2010

11:30 a.m. - 1 p.m.
(GMT-0500) US/Central

Event has ended

If you do not have a full-time job in the oil and gas industry, are a full-time student or Member in Transition (MiT) member, and you do not see a discounted registration fee for students/MiT regarding this event, please contact the GCS manager at spe-gcs@spe.org.


Location

Courtyard on St James

1885 St James Place
Houston, TX 77056
USA