NS-EN ISO 13503-1:2005 Petroleum and natural gas industries - Completion fluids and materials - Part 1: Measurement of viscous properties of completion fluids (ISO 13503-1:2003)
2012NS-EN ISO 13503-1:2011 Petroleum and natural gas industries — Completion fluids and materials — Part 1: Measurement of viscous properties of completion fluids (ISO 13503-1:2011)
2005NS-EN ISO 13503-1:2005 Petroleum and natural gas industries - Completion fluids and materials - Part 1: Measurement of viscous properties of completion fluids (ISO 13503-1:2003)