--> Abstract: Reservoir Characterisation Through a Multi-Well Interference Test in the Giant Mauddud Carbonate Reservoir, Sabiriyah Field in Northern Kuwait, by Rajendra K. Mishra, Moudi F. Al-Ajmi, and Ealian Al-Anzi; #90077 (2008)

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Reservoir Characterisation Through a Multi-Well Interference Test in the Giant Mauddud Carbonate Reservoir, Sabiriyah Field in Northern Kuwait

Rajendra K. Mishra*, Moudi F. Al-Ajmi, and Ealian Al-Anzi
KOC
*[email protected]

The Mauddud carbonate reservoir of Sabiriyah field, northern Kuwait, is a giant depletion-drive reservoir. It is presently undergoing re-development with inverted-9 spot pattern water-flood that was started in 2000. All the active patterns in the reservoir are in the process of conversion to inverted-5 spots through an infill drilling programme. The Mauddud reservoir is a multi-layer faulted reservoir with high permeability contrast between layers. A three-cycle interference test comprising two pressure fall-off and one injection period with a total test duration of 800 hours was conducted in one of the patterns situated at the central part of the reservoir. The injection well of the pattern, which is encompassed by two major faults, was used as the active well, whereas the surrounding six production wells were used as observation wells for measuring the transmitted pressure signals. The prime objectives of the test were to: (1) characterise the two faults with respect to their conductivity and sealing nature; (2) confirm inter-well connectivity; (3) estimate transmissivity and storativity; and (4) identify permeability-anisotropy, if any. The test will assist in: (1) ongoing pattern conversion; (2) reservoir modeling work; and (3) future water-tracer programme. Both type-curve matching using Saphire software, and semi-log straight-line of the derivative of the exponential integral function were used for individual interpretation of each cycle of the test for all the observation wells. Computer program was developed for extracting the correct pressure drop from the exponential integral function for use in type-curve matching for the second and third cycle of the test. A user-friendly work-sheet tool-kit was also developed for the derivative method. Invaluable insights regarding reservoir characteristics in a large influence area were obtained by detailed analysis of the multi-well interference test.

 

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