«Proceedings of Gubkin University»

Skin factor of horizontal well

UDC: 622.276
DOI: -

Authors:

¹ Oil and Gas Research Institute of the Russian Academy of Sciences, Moscow, Russian Federation

Keywords: drilling of horizontal wells, mud cake, skin factor, bottomhole zone treatment, cumulative perforation

Annotation:

The article presents analytical estimates of the depth of penetration of drilling fluid filtrate into productive formations when drilling long horizontal wellbores. It is shown that during drilling, almost the entire difference in the values of hydrodynamic pressure in the wellbore and reservoir pressure occurs in a thin layer of low-permeable clay cake on the walls of the well. It is established that the depth of penetration of the solution filtrate into the formation, proportional to the time during which the formation rock in a given section of the wellbore was in contact with the drilling fluid, varies significantly along the length of the wellbore. It is shown that the effective size of the zone with deteriorated permeability in the initial sections of the wellbore of a fairly long horizontal well is an order of magnitude greater than that of such a zone in the final sections of the wellbore. To reduce the negative effect of the variable skin factor along the trunks of horizontal wells on their productivity, it is proposed to carry out deeper treatment of the bottomhole zones of wells in the initial sections of the wellbore, using, in particular, cumulative perforation with paired charges, which forms a network of shear cracks in the bottomhole zones of wells and increases their filtration conductivity.

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