E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 49/00 (2006.01) E21B 47/00 (2006.01) G01N 15/02 (2006.01) G01N 15/08 (2006.01)
Patent
CA 2256255
A method is provided for establishing semi-quantitative values indicative of porosity and permeability of a formation during drilling. A sample of mud is analyzed and the proportions of each grain constituents are classified into their respective grain size divisions. Each proportion is multiplied against a corresponding weighting factor for establishing values representative of the relative contribution to the formation's porosity and when summed they establishing numeric values corresponding to an environmental index related to the porosity of the formation. Through the assignment of values for ranges of other conventional qualitative characteristics, similar and useful semi-quantitative value of relative permeability can be determined which is proportional to the environmental index, grain angularity, extent of sorting, porosity and is inversely proportional to the extent of cementation.
Na
Zamfes Kosta
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