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![General Arrangement of Drillship [1].](profile/I-Dewa-Gede-Adi-Surya-Yuda/publication/291348892/figure/fig1/AS:320562414014464@1453439443154/General-Arrangement-of-Drillship-1.png)
![Figure 1: General Arrangement of Drillship [1].](profile/I-Dewa-Gede-Adi-Surya-Yuda/publication/291348892/figure/fig1/AS:320562414014464@1453439443154/General-Arrangement-of-Drillship-1_Q320.jpg)
![Figure 4: Lines plan of drillship [1].](profile/I-Dewa-Gede-Adi-Surya-Yuda/publication/291348892/figure/fig4/AS:320562414014467@1453439443245/Lines-plan-of-drillship-1_Q320.jpg)
![Figure 5: Bonjean curve of drillship [2].](profile/I-Dewa-Gede-Adi-Surya-Yuda/publication/291348892/figure/fig5/AS:320562414014468@1453439443279/Bonjean-curve-of-drillship-2_Q320.jpg)
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... first primary data for this study is the reference ship, namely the drillship Oribis One .as made avaliable by Fossli and Hendriks [4]. Based on this data, New drillship was designed as reported in ref [1]. The general arrangement is exhibited in Figure 1 with principal particulars as presented in Table 1. The peculiar feature of a drillship is the arrangement of moonpool to accommodate the extension of drill pipe and riser from the drilling rig down to the seabed. As a moonpool basically is a large opening, then hull structural strength in this location is reduced substantially. Therefore certain strengthening should be established in this ...
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... A drillship is self-propelled to the drill locations at about 12 Knots and commissioned at the desired drill site within the shortest possible time, especially in isolated locations. Drillships are designed for use in deeper waters and isolated regions, although they are not very stable in rough seas [17][18][19][20]. It is, therefore, crucial to examine drillship behavior under extreme weather, as such studies are scarce in the literature. ...
... It is narrowed below the keel to increase the vessel's efficiency and storage capacity; Fig. 2 shows the lines plan. Drillships have capsized at the Seacrest gas reserves field in overseas locations as a result of the severe hurricane circumstances [17]. Due to high mobility, they are considered less stable than semi-submersibles in harsh environments [21][22][23][24]. ...
Drillships are used for exploratory drilling operations in a water depth above 3000 m. Design variants in the new-generation drillships include flexible internal storage and payload capacity. While their operations are quite satisfactory in moderate weather conditions, response under metocean hurricane conditions to preserve operation versatility poses challenges. The design and operation of drillships, which are intricate and domain-specialized vessels, need attention. This study examines the motion characteristics of a drillship for different sea states and environmental conditions. Their stability across critical sea states is also assessed. Based on the numerical studies, it is seen that they experience a modest degree of instability due to excessive roll and pitch under extreme environmental loads. While preliminary checks under mild heave motion showed that the coupled heave–pitch motion dominates the design shear and longitudinal bending, they are critically influenced by the pitch motion. The forces of second-order steady drift in the far field and the near field are compared in the frequency domain. This study identifies parameters that influence its strength and stability, and the results are useful for improving the operational safety and reliability of drillships under challenging offshore conditions.
