US 2017/0254792 A1 · Fluid Composition and Reservoir Analysis Using Gas Chromatography

Abstract

Methods are provided for reservoir analysis. In some embodiments, a reservoir may be analyzed by obtaining abundance ratios at a first measurement station and a second measurement station and determining an abundance ratio trend. Abundance ratios at a third measurement station may be obtained and plotted versus depth with the previously obtained abundance ratios. A change in the abundance ratio trend may be identified and result in further investigation of the reservoir. If the abundance ratio is unchanged, additional abundance ratios may be obtained and plotted versus depth to further evaluate the abundance ratio trend. Methods for reservoir analysis using fluid predictions with and without offset well information are also provided.

Claims14

Dependent claims

A method for analyzing a reservoir traversed by a wellbore, comprising:

obtaining, from a first measurement station within the wellbore, a first composition of a first fluid sample acquired at the first measurement station;
determining an Equation of State (EoS) model for a reservoir fluid using the first composition;
obtaining, from a second measurement station within the wellbore, a second composition of a second fluid sample acquired at the second measurement station;
tuning the EoS model using the second composition;
generating a predicted fluid profile using the EoS model;
obtaining, from a third measurement station within the wellbore, a component ratio from a gas chromatogram of a third fluid sample acquired at the third measurement station;
comparing the component ratio to the predicted fluid profile;
using the comparison to analyze the reservoir.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application

15/599,515Filed 19 May 2017

Priority

17 Dec 2014

Published

7 Sep 2017

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

G01N 33/2823
Oils , i.e. hydrocarbon liquids: raw oil, drilling fluid or polyphasic mixtures
E21B 49/087
Obtaining fluid samples or testing fluids, in boreholes or wells: well testing, e.g. testing for reservoir productivity or formation parameters
E21B 49/10
Obtaining fluid samples or testing fluids, in boreholes or wells: using side-wall fluid samplers or testers
G01N 30/88
Column chromatography: integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86

Fluid Composition and Reservoir Analysis Using Gas Chromatography

Life of this patent

Fluid Composition and Reservoir Analysis Using Gas Chromatography

Life of this patent

Abstract

Claims14