ABSTRACT:

As part of the initiative to boost natural gas production for Sarawak Shell, the Shallow Clastics field development plan targets two shallow gas-bearing reservoirs, H1 and H2. An early deviated appraisal well had been completed in 9-5/8-in. casing with commingled upper completion and a sand-face completion using large-OD expandable sand screens through both targets was used. The well was cleaned up through a temporary well clean-up and test facility to test productivity and evaluate the integrity of the downhole sand-exclusion installation. Possible failure of the sand exclusion method resulted in fines production. The condition worsened as the fines production steadily increased to the extent that the well was deemed unproducible to the facilities. Subsequently a re-evaluation of the sand exclusion method was undertaken before development of the remaining field. The re-evaluation included more extensive core analysis and reviews of the types of sand-face completions suitable for development of the H1/H2 reservoirs. This evaluation enabled the operator and a service/engineering company to develop an innovative sand-exclusion method that combined several new technologies. The aspects of the evaluation, key success factor with synergistic the five wells that have been completed to date with this new sand-exclusion method and the well configuration to address the completion needs will be discussed in this paper. The field implementation of the design, key success factors and results will also be summarized

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