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AAPG Bulletin, Vol. 90 (2006), Program Abstracts (Digital)
7th Middle East Geosciences Conference and Exhibition
Manama, Bahrain
March 27-29, 2006
ABSTRACT: Improved Core Quality Through Application of a Low Invasion Water Based Mud, Tracer
Technology, Half Moon Inner Barrel Coring, and Improved Well-Site Core Handling in a
Sandstone Reservoir in North Kuwait For Oil in Place Calculations and Development Planning
Moudi Fahad Al-Ajmi1 and Ali Khan2
1 Field Development (SA/BA), Kuwait Oil Company, Ahmadi, 61008, Kuwait, phone: 965 -130-71718,
[email protected]
2 India University
Two carefully selected wells were cored recently in Lower Burgan (LB) reservoir in Sabiriyah field in North Kuwait to
improve reservoir description, reservoir performance prediction, and to reduce uncertainty on remaining reserves. In these
cored wells, the coring objectives were to obtain (1)complete coverage of the oil bearing section of the LB reservoir for
sedimentological and petrographic description, (2)high quality samples for waterflood and electrical SCAL measurements
from representative reservoir facies. These planned SCAL measurements are (a) relative permeabilities (b) wettability (c)
capillary pressure, and (3)conventional core analysis. The LB reservoir comprises fragile sandstone, which will require
careful handling. The coring and core handling must be carried out without disturbing the fabric of the rock to ensure
minimal alteration of in situ fluid saturations, and without irreversibly modifying the wettability of the rock. This means that
low invasion coring techniques, using water based bland mud system, and very careful surface handling of the core are
required to minimize any damage. Additionally, the core acquisition program was designed to plug and trim the SCAL plugs
and preserving both the plugs and trims immediately at rig site. This should provide fresh -state and representative center
plugs for saturation and SCAL analysis. D2O Tracer was mixed with the mud system to enable quantification of the filtrate
invasion. Onsite Gamma ray recording was applied and about 50% of the recovered cores were preserved. In one of the
cored wells, ½ moon inner barrel was used for the first time in Kuwait with the low invasion water based mud.
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