«Oilfield engineering»

Formation of the state of wells near-bottom zones operating terrigenous reservoirs

UDC: 622.276.031.011.433:519.2
DOI: -

Authors:

¹ Perm National Research Polytechnic University, Perm, Russia

Keywords: permeability of the near-wellbottom zone, skin-factor, sandstone reservoirs, machine learning

Annotation:

The article presents the results of studying the influence of wells geological and operational parameters on the permeability of the near-wellbottom zone of the reservoir (near-wellbottom zone permeability) and skin factor. In this study a series of multidimensional static models were built, allowing for highly reliable prediction of a near-wellbottom zone permeability in conditions of the investigated terrigenous reservoir under study. The specific productivity coefficient and water cut have a significant impact on the permeability of the near-wellbore zone. A hypothesis is put forward that the high significance of the water cut parameter may be caused by the individual interaction between the rock of the investigated objects and the displacing agent, represented by fresh water (clay swelling). It has been revealed that there is no dependence between the investigated parameters and the model skin factor. Additional parameters (permeability of the reservoir remote zone, well radius, external reservoir boundary radius, effective well radius, wells’ perfection degree) and the SHAP library (gradient boosting) were introduced to determine the contribution of each parameter to the final prediction of the desired value – the skin factor. Thus, the most significant parameters influencing the formation of the permeability of the near-wellbottom zone and the skin factor have been identified, and the possibility of their prediction has been assessed.

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