ISO/TC 67/SC 4/WG 8 - Modular Drilling Rigs

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 18647:2017 gives requirements for the design, fabrication, installation, commissioning and integrity management of modular drilling rigs on offshore fixed platforms. The modular drilling rig includes some or all of the equipment as follows: - drilling equipment including a derrick/mast and its controls that can be moved by skidding a drilling support structure; - drilling support equipment which includes support facilities such as power supply/distribution system; - mud and cement storage, mixing, monitoring and control equipment. ISO 18647:2017 is applicable to the modular drilling equipment on offshore structures for the petroleum and natural gas industries, as follows: - new equipment arranged in a modularized form; - the equipment contained in several modules, each of which can be lifted and installed on to the platform, however, the equipment may be arranged within the modules as is convenient; - the modules assembled together offshore for hook up and commissioning; - intended for long term use on a new fixed offshore structure; - Intended for temporary use on a number of different offshore platforms. ISO 18647:2017 is not applicable to drilling equipment - installed on mobile offshore units, and - intended primarily for onshore use. ISO 18647:2017 does not apply to those parts and functions of an offshore platform that are not directly related to drilling.