ISO 3421:2022
Petroleum and natural gas industries — Drilling and production equipment — Offshore conductor design, setting depth and installation

Standard No.

ISO 3421:2022

Release Date

2022

Published By

International Organization for Standardization (ISO)

Latest

ISO 3421:2022

Scope

This document specifies the requirements and recommendations for the design, setting depth and installation of conductors for the offshore petroleum and natural gas industries. This document specifically addresses: — design of the conductor, i.e. determination of the diameter, wall thickness, and steel grade; — determination of the setting depth for three installation methods, namely, driving, drilling and cementing, and jetting; — requirements for the three installation methods, including applicability, procedures, and documentation and quality control. This document is applicable to: — platform conductors: installed through a guide hole in the platform drill floor and then through guides attached to the jacket at intervals through the water column to support the conductor, withstand actions, and prevent excessive displacements; — jack-up supported conductors: a temporary conductor used only during drilling operations, which is installed by a jack-up drilling rig. In some cases, the conductor is tensioned by tensioners attached to the drilling rig; — free-standing conductors: a self-supporting conductor in cantilever mode installed in shallow water, typically water depths of about 10 m to 20 m. It provides sole support for the well and sometimes supports a small access deck and boat landing; — subsea wellhead conductors: a fully submerged conductor extending only a few metres above the sea floor to which a BOP and drilling riser are attached. The drilling riser is connected to a floating drilling rig. The BOP, riser and rig are subject to wave and current actions while the riser can also be subject to VIV. This document is not applicable to the design of drilling risers.

ISO 3421:2022 Referenced Document

• ISO 19900 Petroleum and natural gas industries — General requirements for offshore structures
• ISO 19901-4 Petroleum and natural gas industries - Specific requirements for offshore structures - Part 4: Geotechnical and foundation design considerations
• ISO 19901-8 Petroleum and natural gas industries — Specific requirements for offshore structures — Part 8: Marine soil investigations*， 2023-09-01 Update
• ISO 19902 Petroleum and natural gas industries - Fixed steel offshore structures
• ISO 19906 Petroleum and natural gas industries — Arctic offshore structures

ISO 3421:2022 history

• 2022 ISO 3421:2022 Petroleum and natural gas industries — Drilling and production equipment — Offshore conductor design, setting depth and installation