Offshore installation technology of ultra-slender ratio riser casing for deeper water jacket

Abstract

The invention discloses a deeper water jacket super slender ratio drill conductor marine installation technology.The deeper water jacket super slender ratio drill conductor marine installation technology comprises the following installation steps that step 1,a second hoisting sling is mounted on the superslender ratio drill conductor; step 2,a first hoisting sling is assembled and connected on thesuper slender ratio drill conductor; step 3,a floating hoist is used for straightening the superslender ratiodrill conductor; step 4,a floating crane is used forsuspending the super slender ratiodrill conductor at a wellhead of the water jacket;step 5, the first hoisting sling hoisting mode is converted into an overall hoisting mode composed of the first hoisting sling and the second hoisting sling, and the superslender ratio mounted until free mud entering is realized; safe, stable, and reliable righting and installation of the superslender ratio drill conductor are realized, the length limit of the superslender ratio drill conductor is broken through, the section amount of the deeper water jacket drill conductoris decreased, the mud entering of a first section of the deeper water jacketdrill conductoris realized, and the suspension problem in the wellhead area is solved; and the operation is convenient, the engineering construction efficiency is improved, and the cost is lowered.

Description

technical field [0001] The invention relates to an offshore installation process of an ultra-slender ratio water-resisting casing of a relatively deep water jacket. Background technique [0002] Riser casing is a key facility in offshore drilling operations and an important channel for oil and gas well production. The installation of the riser casing in deeper water is limited by the turn-over length of the first riser casing (the length of the riser casing is too long, and the turn-over strength does not meet the requirements), so the number of sections of the riser casing is large ( According to statistics, the jacket riser casing in the Bohai Sea is divided into about 2 sections, the jacket riser casing in Weizhou Oilfield is divided into about 3 sections, and the jacket riser casing in Dongfang Gas Field is divided into about 5 sections). Moreover, the length of the first riser casing of the deeper water jacket cannot enter the mud and needs to be hung on the wellhead a...

AI Technical Summary

Problems solved by technology

Moreover, the length of the first riser casing of the deeper water jacket cannot enter the mud, and it needs to be hung on the wellhead area of ​​the jacket. Due to the consideration of reducing the influence of impact load and punching shear load, the strength of the wellhead area of ​​the jacket can only bear one The weight of 2 riser casings, therefore, a deeper water jacket riser can be suspended at most 1 to 2 at a time, which seriously affects the offshore construction efficiency of the riser casing

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