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Method and system for determining hydrocarbon properties

A technology of hydrocarbons and total hydrocarbons, which is applied in the fields of earthwork drilling, nuclear radiation exploration, geophysical measurement, etc.

Inactive Publication Date: 2007-09-05
SCHLUMBERGER OVERSEAS SA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Determination of Apparent Gas Volume Using Formation Neutron Porosity Data

Method used

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  • Method and system for determining hydrocarbon properties
  • Method and system for determining hydrocarbon properties
  • Method and system for determining hydrocarbon properties

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Embodiment Construction

[0023] As previously mentioned, the present invention relates to a method and system for determining the CDV of hydrocarbons in a multiphase environment where the oil and gas phases are not immiscible. The method and system include calculating the total hydrocarbon volume from the apparent oil volume and the apparent gas volume. Apparent oil volume was determined using C / O data from a nuclear logging tool operating in the inelastic neutron scattering mode. Apparent gas volume was determined using neutron porosity data from a nuclear logging tool operating in pulsed neutron capture ("PNC") mode. The total hydrocarbon volume may also be determined using well log data from formation thermal neutron capture cross section measurements, or cased hole formation resistivity tools, or using any other suitable technique known to those skilled in the art. This total hydrocarbon volume is then used to inversely calculate the total hydrocarbon CDV at various formation depths using the wel...

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Abstract

Method and system are disclosed for determining hydrocarbon CDVs in a multiphase environment. The method and system involve calculating a total hydrocarbons volume from an apparent oil volume and an apparent gas volume. The apparent oil volume is determined using C / O data from a nuclear logging tool operating in inelastic neutron scattering mode. The apparent gas volume is determined using neutron porosity data from a nuclear logging tool operating in pulsed neutron capture (''PNC'') mode. It is also possible to determine the total hydrocarbons volume using log data from formation thermal neutron capture cross section measurements, or a cased hole formation resistivity tool. The total hydrocarbons volume is then used to back-calculate the total hydrocarbons CDV at various formation depths using the logged C / O data. The resulting independently calculated total hydrocarbon CDV may be used for proper matching of log data and simulation results for history matching purposes.

Description

technical field [0001] The present invention generally relates to the quantitative determination of hydrocarbon properties. More specifically, the present invention relates to methods for utilizing carbon / oxygen ("C / O") log data and hydrocarbon saturation estimates obtained from cased-hole pulsed neutron capture and / or formation resistivity logging tools, A method and system for determining the carbon density value ("CDV") of hydrocarbons. Background technique [0002] As is known in the field of petroleum production, substantial amounts of oil remain in oil-bearing formations after water flooding. A portion of this remaining oil can be recovered using various EOR (enhanced oil recovery) techniques including alternating water gas ("WAG") injection. A WAG involves the repeated injection of first gas and then water into the formation from injection wells strategically placed around the production well. The injected gas occupies pore space in the formation that might otherwi...

Claims

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Application Information

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IPC IPC(8): G01V5/10E21B43/00
CPCG01V5/105
Inventor A·辛盖夫斯基
Owner SCHLUMBERGER OVERSEAS SA
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