A significant and increasing proportion of wells are drilled horizontally, or at a high angle, through reservoir sections. The benefit of this approach is increased reservoir exposure and, consequently, greater production compared to vertical wells. Among the challenges related to horizontal wells is formation evaluation using logs that may be responding to multiple reservoir layers.
The graphical capabilities in the Techlog platform enable a new workflow for valid interpretations in HAHz wells. The measurements acquired in the HAHz well are used to define the formation geometry around the well and populate the layer properties. External sources of geometrical models or remote bed boundary inversion maps may be used to enhance understanding of the formation geometry around the well. The overall goal of the interpretation is to determine the position and properties of each layer that is traversed by the well.
As the formation properties determined by the workflow are free of the most common geometric effects in HAHz wells, they can be used in the same petrophysical calculations and workflows applied to vertical wells in the field or reservoir.
The 3D Petrophysics module for HAHz includes a new feature to display visualization of complex azimuthal and radial information around the wellbore trajectory. Boosting understanding, and analysis, the Wellbore Centric Grid display provides a platform for azimuthal petrophysics.
Geometrical effects are observed on log responses in almost all HAHz wells. Previously, the industry was lacking a readily available interpretation methodology to tackle this very common phenomenon. This new Techlog workflow addresses the most common geometry effects observed in HAHz well logs. Now, petrophysicists can efficiently extract the full value from acquired measurements to make interpretations they can trust.
