Method for determining fluid mobility characteristics of earth formations
US4964101A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 1989 |
| Grant date | Oct 16, 1990 |
| Priority date | — |
| Expiry date | Mar 23, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/50
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for determining the mobility of fluids within earth formations surrounding a borehole. The preferred embodiment of the invention utilizes measured tube wave parameters such as acoustic slowness and attenuation as indicators of formation fluid mobility, and further modifies the results with a mudcake compensated parameter. The mudcake compensated parameter preferably includes a non-zero, finite membrane impedance contribution, and a mudcake elastic deformation contribution. By inputting values for certain mudcake parameters such as mudcake compressional acoustic velocity, shear velocity, density and impedance, the invention generates an improved quantitative estimate for tube wave derived mobility or permeability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.