In this paper, we present the details of how four extended well tests in the Mahogany field, offshore Trinidad, were designed, executed, and interpreted. While much of the interpretation for a given test can be done using standard analytical software, we pay special attention to the need for numerical simulations of the measured responses to establish connected volumes and previously unidentified flow barriers.

To establish how long these nine wells can produce the required contract rates and, hence, the required date of renewed drilling, a program for extended well testing was developed. Each well was tested according to the following sequence: clean up flow followed by a stabilizing shut-in period, a forward sequence flow-after-flow ending with an extended flow period, and extended shut-in. The lengths of each of these test sections is planned to vary from well to well but, in general, the entire test sequence was designed to be 35-60 days long. These tests are intended to establish permeability, mechanical and turbulent skin factors, and the areal extent of the sand connected to the test well.

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