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US 8,939,021 B2Granted
Fluid expansion in mud gas logging
AssigneeSchlumberger Technology Corporation
InventorsPierre J. Daniel, Stefan Smuk, Reza Taherian, Julian J. Pop
Life of this patent
Estimating the term…
Abstract
Apparatus and methods for fluid expansion in mud gas logging to determine downhole the composition of a downhole hydrocarbon fluid sample by expanding the sample using an incrementally adjustable piston or a series of fixed chambers to extract vapor containing composition components of interest.
Claims13
A method, comprising:
- acquiring a hydrocarbon sample in a downhole tool at a downhole location in a wellbore extending into a subterranean formation, wherein the downhole tool comprises a first chamber, a second chamber, and a spectrometer;
- subsequently determining a first characteristic of the hydrocarbon sample by:
- expanding the hydrocarbon sample from a first volume to a second volume, wherein the first volume doesn't comprise the first chamber or the second chamber, and wherein the second volume comprises the first chamber but not the second chamber;
- subsequently fluidly isolating the first chamber;
- and
- subsequently analyzing the hydrocarbon sample in the first chamber using the spectrometer;
- and
- subsequently determining a second characteristic of the hydrocarbon sample by:
- expanding the hydrocarbon sample portion from the first volume to a third volume, wherein the third volume comprises the second chamber but not the first chamber;
- subsequently fluidly isolating the second chamber;
- and
- subsequently analyzing the hydrocarbon sample in the second chamber using the spectrometer.
9 more elements
A method, comprising:
- acquiring a hydrocarbon sample in a downhole tool at a downhole location in a wellbore extending into a subterranean formation, wherein the downhole tool comprises a first chamber, a second chamber, a third chamber, and a spectrometer, and wherein the hydrocarbon sample is liquid having a first volume;
- subsequently determining a first concentration of a first component of the hydrocarbon sample by:
- expanding the hydrocarbon sample from the first volume to a second volume, wherein the first volume doesn't comprise the first, second, or third chambers, the second volume comprises the first chamber but not the second or third chambers, and the second volume comprises liquid and gas;
- subsequently fluidly isolating the first chamber;
- and
- subsequently measuring a first mole fraction of the first component of the hydrocarbon sample in the first chamber using the spectrometer;
- determining a second concentration of a second component of the hydrocarbon sample by:
- fluidly isolating the first chamber;
- subsequently fluidly connecting the first chamber to the second chamber;
- and
- subsequently measuring a second mole fraction of the second component of the hydrocarbon sample in the first chamber using the spectrometer;
- determining a third concentration of a third component of the hydrocarbon sample by:
- expanding the hydrocarbon sample portion from the first volume to a third volume, wherein the third volume comprises the third chamber but not the first or second chambers, and wherein the third volume comprises liquid and gas;
- subsequently fluidly isolating the third chamber;
- and
- subsequently measuring a third mole fraction of the third component of the hydrocarbon sample in the third chamber using the spectrometer;
- and
- determining a fourth concentration of a fourth component of the hydrocarbon sample by:
- fluidly coupling the first and third chambers together;
- and
- subsequently measuring a fourth mole fraction of the fourth component of the hydrocarbon sample in the first and third chambers using the spectrometer.
18 more elements
Dependencies are inferred from the claim text.