| 主权项 |
1. A method for determining the fluid characteristics in a well, wherein said method comprises:
/a/ receiving mass ratios, each mass ratio being associated with a set of hydrocarbon cuts, and receiving a molecular ratio, said molecular ratio being associated with a set of hydrocarbon cuts; /b/ converting received mass ratios into molecular ratios based on predetermined molecular weights, each predetermined molecular weights being associated with an element in the sets of hydrocarbon cuts; /c/ normalizing converted molecular ratios with the received molecular ratio; /d/ determining parameters (α,β) of a sequence defined byxn=α(1-βn)xn-1, each normalized molecular ratio being associated with a member of the sequence or a sum of members of the sequence, at least a difference between said normalized molecular ratio and the associated member or the associated sum of members being minimized; /e/ computing an estimated molecular weight (Mw6+) function of(k+11-α)ΔM, where k is an integer and ΔM is a predetermined value representing an molecular weight increment between two hydrocarbon cuts; /f/ if a stabilization criteria is met, the steps /b/ to /f/ are iterated with the estimated molecular weight as one of the predetermined molecular weights in step /b/; and /g/ outputting the values of the parameters determined in step /d/. |
