Use of Interval Pressure Transient Testing to Improve Reservoir Characterization of Mauddud Carbonate Reservoir in Sabiriyah Field, Northern Kuwait

Bodoor Baroon*, Moudi Al-Ajmi, Hamad Najeh, and Ealian Al-Enzi
KOC
*[email protected]

The front-tracking and monitoring of pattern water-flooding are crucial reservoir management practices in the Mauddud carbonate reservoir in Sabiriyah field, located in northern Kuwait. It is important to run the interval pressure transient testing (IPTT) in this reservoir in order to have a complete understanding of the vertical connectivity between the layers in conjunction with other geological and dynamical data. IPTT tests were run in the Mauddud Formation at different depths in selected newly drilled wells in order to obtain a representative reservoir Kv/Kh (vertical/horizontal permeability ratio). This is in order to understand the vertical connectivity between high-permeability zones and the surrounding less-permeable zones, to support the PLT (production logging tool) result, which shows large contributions from high-permeability thief zones. The test was run by producing-from or injecting-into one set of perforations, and measuring the pressure response at another set. It was important to investigate the dual-porosity behavior and inter-connectivity between layers, if any, which was not observed during the pre-water flooding period. For field development and reservoir management, it is important to describe the layering in terms of the vertical communication between layers. The number and placement of both injection and production wells requires an accurate description of the layering. IPTT has been used to calibrate both log and core data, with the advantage of conducting these tests under real reservoir conditions. The test results were excellent; they indicated very good connectivity between the Mauddud layers, and provided useful and valuable information about the inter-layer connectivity, reservoir heterogeneities and anisotropy.

AAPG Search and Discovery Article #90077©2008 GEO 2008 Middle East Conference and Exhibition, Manama, Bahrain