GB/T 46776-2025 Specification for offshore conductor design,setting depth and installation

Scope

This document specifies the requirements and design methods for marine riser pipes, their installation depth, and installation (referring to the process of lowering riser pipes into the formation and fixing them). This document specifically elaborates on:
—— The design of riser pipe specifications, including the determination of the riser pipe diameter, wall thickness, and steel grade;
—— The design of riser pipe installation depth, including the installation depths for three installation methods: hammering method, drilling method, and jetting method;
—— The requirements for the three riser pipe installation methods, including their applicable scope, installation procedures, data recording, and quality control.
This document applies to:
—— Riser pipes for jacket platforms: riser pipes that are laterally supported by guide holes set at regular intervals within the jacket platform to prevent excessive displacement;
—— Riser pipes supported by self-elevating drilling platforms: temporary riser pipes used only during drilling operations on self-elevating drilling platforms. In some cases, these riser pipes are tensioned by tensioners installed on the drilling rig;
—— Free-standing riser pipes: a cantilevered self-supporting riser pipe installed in shallow water with a water depth of approximately 10 m to 20 m, providing the sole support for oil wells. Under specific conditions, they can be used to support a small boarding deck and docking deck;
—— Underwater wellhead riser pipes: riser pipes completely submerged underwater, extending only a few meters above the seabed, connecting the underwater BOP and drilling riser pipes. The drilling riser pipes are connected to a floating drilling platform, and the BOP, riser pipes, and drilling rig are subject to the effects of waves and currents, while the riser pipes may also be affected by VIV.
This document does not apply to the design of drilling riser pip

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