The paper describes the challenges in integrated history matching of high-viscous oilfields. Integrated models are increasingly implemented in hydrocarbon fields development. Once the integrated model is applied within the technological process, it becomes the tool of the oil company operation. The advantage of the integrated models is confirmed by various articles in Russian and foreign research publications. It has been confirmed, that ignoring of temperature dependencies of high-viscous oil and water-oil emulsion lead to poor history matching of the stream gathering and transportation system, especially in cold seasons. The performed studies on the integrated model of the oilfield showed significant dependency of the flow line pressure in gathering and transportation system from the ambient temperature. The fact, that the model describes gathering and transportation system behaviour very well within warm seasons and has poor history matching within cold seasons, proves the ignoring of the temperature effect. It has been described, that the temperature dependency for high-viscous oil is significant, especially in the area of low temperatures. This fact allows performing good history matching of the gathering and transportation system to the flowline pressure measurement during the cold seasons. However, without consideration of possible emulsions in some point of the gathering and transportation system, it is impossible to “fine-tune” the history matching. Even though, this assumption is hypothetical, it clearly indicates the challenging spots within the gathering system, which require additional studies for sources determination of the stream motion resistance. The adjustment of the integrated model it is necessary to understand that the matching results significantly depend on the initial data of the model update. Asynchrony in measurements, mistakes in the system operation parameters, ignored effects – all these bring the high level of uncertainty and reduce the forecast properties of the integrated model.
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