"REPORTER of the Association of Drilling Contractors" N 4, 2010

GEOPHYSICAL METHODS OF ASSESSMENT OF WELL CEMENTING QUALITY

Dmitry F. Novokhatsky – PhD in Engineering, professor, OJSC “NPO “Burenie”,
postmaster@npoburenie.ru ;
Alexander V. Krivoshey – PhD in Engineering, professor, OJSC “NPO “Burenie”,
postmaster@npoburenie.ru .

Key words:cementing quality; geophysical surveys; quality coefficient; density of contact with pipe string and rocks; density of cement bond;  cementing of casing string  , eccentricity.


The article describes a method of casing cementing quality using geophysical survey techniques: cement bond logging, acoustic cement bond logging, selective gamma-gamma ray logging, downhole gamma ray density fault detection.  Provided are formulas for calculation of cementing quality coefficient based on cement bond logging data: density of contact with cement bond and casing  Кc, rock Кr, integrated coefficient of quality of density of contact with casing and rock; there is an example of assessment of quality of centering in a particular interval and wellbore as a whole, Кeco.  There are examples of grading of cementing quality using the K coefficient.   The qualitative assessment of the quality of cementing and centering is based on desirability function that is widely used for experimental data processing.

 

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