Method and system for estimating breakdown pressure using rock weakness index
AssigneeCgg Services SAS
InventorsFabien ALLO, Chi Vinh LY
Life of this patent
Estimating the term…
Abstract
A method for estimating breakdown pressure values along a wellbore starts from analyzing cuttings from locations along the wellbore to determine rock properties, including rock texture information associated with the locations. The anisotropic elastic and mechanical properties at the locations are calculated based on the rock properties and using at least one rock physics model. Rock weakness index values corresponding to the locations are then calculated based on the anisotropic elastic and mechanical properties and the rock texture information. The breakdown pressure values at the locations are estimated from the rock weakness index values.
Claims20
A method for improving exploitation of a wellbore, the method comprising:
- analyzing cuttings from locations along the wellbore to determine rock properties including rock texture information associated with the locations;
- calculating anisotropic elastic and mechanical properties at the locations based on the rock properties and using at least one rock physics model;
- calculating rock weakness index values corresponding to the locations, based on the anisotropic elastic and mechanical properties and the rock texture information;
- and
- estimating breakdown pressure values at the locations from the rock weakness index values,
- wherein the exploitation is optimized based on the breakdown pressure values.
A system for improving wellbore exploitation, the system comprising:
- a sample preparation installation for preparing cuttings from locations along the wellbore for a scanning electron microscope with energy dispersive X-ray, SEM-EDX, analysis;
- an SEM-EDX apparatus for analyzing the prepared cuttings from locations to determine rock properties associated with the locations;
- a data processing apparatus with a processor configured
- to calculate anisotropic elastic and mechanical properties at the locations based on the rock properties and using at least one rock physics model,
- to calculate rock weakness index values corresponding to the locations, based on the anisotropic elastic and mechanical properties and the rock texture information;
- and
- to estimate breakdown pressure values at the locations from the rock weakness index values.
A non-transitory computer readable recording media storing executable codes which when executed by a computer make the computer perform a method for improving exploitation of a wellbore, the method comprising:
- receiving images and data obtained by analyzing cuttings from locations along the wellbore to determine rock properties including rock texture information associated with the locations;
- calculating anisotropic elastic and mechanical properties at the locations based on the data and using at least one rock physics models;
- calculating rock weakness index values corresponding to the locations, based on the anisotropic elastic and mechanical properties and the rock texture information;
- and
- estimating breakdown pressure values at the locations from the rock weakness index values,
- wherein the exploitation is optimized based on the breakdown pressure values.
Dependencies are inferred from the claim text.