| 摘要 |
A method of identifying a material 105, 106 and/or its condition in a borehole 100 is described, together with related apparatus 107. The material may be between first 104 and second tubulars 102 or between a first tubular and a wall of the borehole. The method may comprise providing a reference quality factor (Qreference) for one or more known materials in one or more known conditions and measuring a downhole quality factor (Qmeasured) of the material and/or its condition. A spectral ratio α (alpha) = (Qmeasured/Qreference) may then be computed for one or more known materials under one or more known conditions followed by an analysis of the spectral ratios to identify the material and/or condition of the material in the borehole. The material may be cement and the quality maybe acoustic/seismic, sonic or vibrations |
