Abstract
The standard wireline logging tool string has been re-engineered into an integrated string named the ‘PLATFORM EXPRESS’, introduced recently to Libya. The string features more robust electronic packaging and mechanical design. It is faster than the existing standard.
The ‘PLATFORM EXPRESS’ logging string provides better answers and reliability and is much more efficient to run. Indeed, the traditional suite of resistivity and porosity measurements has been upgraded and expanded to include micro-resistivity, imaging, and tool movement measurements. The new sensors are integrated into a shorter tool string that is less than half the length of the standard one, weighs half, and its logging speed is double for the same resolution of data: New algorithms such as speed-correction and compensation for borehole effects can be run in real-time. Shallow resistivity (Rxo) and litho-density sondes are mounted on a single shorter skid which is articulated by a flex joint for improved pad contact against the borehole wall. The litho-density tool shows a third detector that increases significantly the measurements’ reliability.
Also, traditional logs used in petrophysical interpretation can be produced with a high vertical resolution.
The first part of this paper details the tool string features and shows how data quality benefits from the new design. It follows the string sequence i.e., from top to bottom: the gamma ray-neutron tool (HGNS), the litho-density and shallow resistivity tool (HRGD), and the high-resolution resistivity tool (HALS). The second part focuses on an actual case study from Libya.