| 摘要 |
A method of determining the depth of equipment in an underground borehole, the equipment being suspended in the borehole by means of a cable extending from the surface into the well, comprises: (i) determining the amount of cable introduced into the well at the surface; (ii) dividing the cable in the borehole into a series of elements; (iii) determining the tension in each element of the cable in the borehole; (iv) determining the stretch of the cable in the borehole for the determined tension in all elements; and (v) determining the depth of the equipment from the determined amount of cable introduced into the well from the surface and from the determined stretch of the cable in the borehole. The method can be used for correcting a depth measurement or determining an error in a depth measurement made on the cable at the surface by determining a correction factor using the methodology described above. The correction or error determination can be applied directly to log data as well as to the depth measurement.
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