Sarawak Shell Bhd operates the Shallow Clastics field, which targets two shallow gas-bearing reservoirs, H1 and H2. An early appraisal well had been drilled deviated, and 9-5/8-in. casing was used. A commingled upper completion and a sand-face completion using large-OD expandable sand screens through both targets was used. Upon completion, the well was cleaned up through a temporary well clean-up and test facility. The purpose of the well was to test productivity and evaluate the integrity of the downhole sand-exclusion installation. Fines production, possibly due to the failure of the sand exclusion method, steadily increased to the extent that the well was deemed unproducible to the facilities.

Due to the high fines produced from this first well, 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.

This paper discusses the evaluation and the four wells that have been completed to date with this new sand-exclusion method and the well configuration to address the completion needs. The field implementation of the design, key success factors and results will also be summarized.

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