SINCLAIR OIL & GAS COMPANY. GEO CHEMICAL LABORATORY, TULSA, OKLA. 

 PATTERN WATER ANALYSIS SYSTEM 

 SCALE: MEQ. PER LITER 



WATER IN QUESTION 



25*1 



75* B 



Figure 13-3. Water-analysis patterns. 



test of formation B encountered water from which a sample was taken and sent 

 to the laboratory for analysis. The pattern of this water plotted in Figure 13-3 

 is marked "water in question". Patterns for formations A and B waters are 

 marked water A and B. They have been plotted from samples known to be 

 representative of formations A and B. On observing these patterns, one notes 

 that the pattern of the water in question does not match with A or B, and 

 therefore, probably is a mixture of the two. Now various mixtures of waters A 

 and B are calculated, and their patterns are plotted (figs. 13-3 and 13-4). If it 

 is assumed that a mixture of 25 percent water A and 75 percent water B is 

 present, pattern No. 4 in Figure 13-3 would be obtained. A mixture of 5{ 

 percent water A and 50 percent water B gives pattern No. 1 (fig. 13-4). A 

 mixture of 75 percent water A and 25 percent water B gives pattern No. 2, 

 Figure 13-4. Now, if these patterns are compared with the patterns in Figure 

 13-3, one may observe that the pattern 2 of Figure 13-4, which is composed of 

 75 percent water A and 25 percent water B, is the same as the pattern of the 

 water in question (fig. 13-3). Therefore, the water in question is composed of 

 75 percent formation A water and 25 percent formation B water. With this 

 information, the well could be resqueezed and the upper water shut off. 



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