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

Ahmadreza Younessi A *
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A Baker Hughes, Perth, WA, Australia.

The APPEA Journal 62 - https://doi.org/10.1071/AJ21318
Published: 3 June 2022

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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Keywords: Australia, completion, Geographe field, geomechanics, horizontal well, offshore, Otway Basin, sand production prediction.

Ahmadreza Younessi holds a BSc in Mining Engineering (2004), MSc in Rock Mechanics Engineering (2006) from Amir Kabir University and PhD in Petroleum Engineering (2012) from Curtin University, Australia. He has been working in Oil and Gas industry as a Geomechanics consultant since 2006. He joined Baker Hughes Geomechanics team in 2012. Since then, he was involved in numerous projects including 1D and 3D geomechanical modelling, wellbore stability analysis, near-real-time analysis, sand production prediction, sanding rate quantification, compaction and subsidence analysis, 4D geomechanical modelling and fault reactivation analysis mainly in Asia-Pacific region. He is the regional advisor in 3D/4D geomechanical modelling applications. He also actively contributes to technology and software development. He has more than 20 publications in peer reviewed journals, SPE papers and conference presentations. He has served as technical committee in several SPE conferences and technical workshops.