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Technical Paper: Surveillance and Diagnostics of Permanent Bottomhole Gauge Data Coupled with Geomechanical Modeling to Identify Sources of Formation Damage

Society: SPE
Paper Number: 112429
Presentation Date: 2008
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Abstract

Permanent instruments to measure pressure and temperature are a regular feature of oil and gas well completions. As wells are drilled in deepwater, high-pressure, high-temperature, high-porosity reservoirs or other challenging environments, these measurements provide valuable data to evaluate reservoir quality and wellbore integrity. Pressure data is routinely used to determine the flow properties of the reservoir with transient analysis. Key performance indicators (KPI's) are selected by the well operator such as reservoir permeability, pressure, and formation damage index or skin factor; these KPI's are archived and trended with time to identify production impairments and opportunities for well intervention. Aside from routine well production surveillance, the pressure history allows for assessment of geomechanical changes such as the degree of reservoir compaction and to evaluate the potential of wellbore failure due to compaction-induced displacements. This paper illustrates the use of the pressure and temperature data from a deepwater well completion in the Gulf of Mexico (GOM) to monitor compaction and to understand the possible mechanisms behind a sudden drop of production that took place in early 2007.

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