Research On The Application Of Oil Fingerprints Technique In Oil Wells Management

In the process of prospect for oil, it is important to commingled oil well that makes sure the contribution of the certain single zone in commingled oil, from which we can analysis the ability of oil production, the variation of oil zone and the total oil production in oilfield. Oil fingerprint technique has the advantages of the low cost and evaluating the oil zone without stopping production. It analysis the contribution of the certain single zone in commingled oil quickly, repeatedly and exactly. This thesis uses the technology of whole-oil to analysis the oil fingerprint which including the height of peak, area of peak and the symmetry of peak etc, the oil fingerprint database is built on the base of oil fingerprint data. The single zone contribution ratio is made, according to the oil fingerprint differences of individual zone and fingerprint variation characteristics of commingled oil. A new algorithm of similarity between the standard and unknown chromatographic fingerprint is provided, and an estimate index is also provided, combined with those two methods, we can analysis the same material's variety of reserve time in difference oil zone. Based on the above research, an oil fingerprint distinguishing method is provided to deal with and eliminate the oil fingerprints data, and what is more fractal distinguishing method is provided. Finally, this thesis builds up an oil fingerprints calculation model and a Back Propagation Network model to analysis the two and above pay zones in commingled oil well, besides using the fractal theory to improve the oil fingerprints calculation model. Based on the theory research, the multi-oil production analysis software is developed, analyzes the two and three pay zones. The results show that the errors between production logging result and fingerprints calculation result are all below 7.5% for two zones, and 16% for three zones commingled oil well, the errors are all under the allowed range. Therefore that software developed based on oil fingerprints technique can be used to calculate the contribution of individual zone in commingled oil well, and provides exactly data to manage the oilfields.