Method for determining the acoustic characteristics of a mud filter cake
AssigneeSchlumberger Technology Corporation
InventorsTimur Vyacheslavovich Zharnikov, Masafumi Fukuhara, Alexander Zazovsky, Fernando Garcia-Osuna
Life of this patent
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Abstract
At least one acoustic sensor registers a pressure response to a low-frequency non-oscillating pressure signal generated in a borehole by at least one source. At least one characteristic of a transient process of pressure change is determined from the registered signal. A thickness of a mudcake is determined. Then, based on the values received, a mudcake piezoconductivity or a fluid mobility or both are determined.
Claims19
A method for determining mudcake acoustic characteristics in a borehole, the method comprising:
- registering by at least one acoustic sensor a response to a low-frequency non-oscillating pressure signal generated in a borehole by at least one source;
- determining from the registered signal at least one characteristic of a pressure change transient process;
- determining a thickness of a mudcake;
- and
- determining based on values obtained a piezoconductivity of the mudcake, a fluid mobility, or both.
The method of 18, wherein the short high-frequency signals are supplied at least from two positions, located at different distances from the mudcake.
Dependencies are inferred from the claim text.