Concurrent 6. Presentation for: Progressive sanding evaluation at different stages of the Geographe field development, Otway Basin

Abstract

Presented on Tuesday 17 May: Session 6

Sanding risk assessments were conducted at different stages of development of Geographe field in the Otway Basin, Australia. The initial sanding analysis was conducted using the exploration and appraisal wells data in 2010. This analysis showed low sanding risk for the planned wells with the expected production plan. The sanding model was then updated in 2014. Logs, core tests and sand-free production data from the early production wells were used to improve the initial sanding model. The updated model reconfirmed the low sanding risk for planned horizontal wells and suggested no sand control would be required even at high depletions. The last model update was conducted in 2019 taking the advantage of about 5 years of sand-free gas production from two long horizontal laterals, with no downhole sand control. As of early 2022, the horizontal wells are still producing sand-free with depletion approaching more than 75%. A geosteered long horizontal well (approximately 2.1 km) at a different azimuth was drilled in the latter part of 2021. As the updated sanding model showed negligible risk of sanding for the planned well, a sand-face completion with pre-drilled liner was implemented. The progressing sanding analyses helped to augment the reliability of the initial prediction by calibrating against the actual production data from two horizontal wells. Drilling and production experiences are used to optimise geosteering and confirm suitability of the completion system for the well including later life of the field at high-pressure depletion condition.

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