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Subsea wellhead stability study of composite casing for deepwater drilling
Ocean Engineering, 2020Abstract A composite casing is a new kind of pipe string composed of an upper conductor and a lower casing. It reduces the installation time considerably and can be applied to hard formations. However, the wellhead stability when using a composite casing is not the same as that of a conventional conductor, and it is not yet well understood.
Wenlong Li +4 more
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Mathematical Modeling of 15-meter Subsea Wellheads
European Petroleum Conference, 1982ABSTRACT A mathematical model has been developed for subsea wellheads to calculate bearing and hoop stresses. For hoop stress calculations a tentative critical cross section has been introduced which, although controversial, gives results which correlate remarkably well with field tests. Wellheads designed according to the
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Subsea Wellhead Fatigue Analysis With Focus on Thermal Conditions
Volume 1: Offshore Technology; Offshore Geotechnics, 2016The structural integrity of subsea wellhead systems has to be maintained during the life cycle of a well and is of concern when frequent intervention and workover operations are performed to extend its service lifetime. Recent efforts have been made to improve and standardize methods for modeling wellhead fatigue-related loads and expected service life.
Lucas Cantinelli Sevillano +3 more
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Requirements for a Full Drill through Subsea Wellhead and Tree System
IADC/SPE Drilling Conference, 2008Abstract This paper describes the requirements realized in the development of a full drill through subsea wellhead and tree specification. Drill through wellhead and tree systems provide an opportunity for capital and operating expense savings.
Sterling Lewis, Jay Suter
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Seal Integrity and Connector Clamping Force at the Subsea Wellhead
Offshore Technology Conference, 1983ABSTRACT The importance of the relative stiffness of the hydraulic connector and the wellhead hub for subsea wellhead connections is demonstrated using existing design principles for bolted flanges and clamps. Connector stiffness is determined experimentally for one design, and a method utilizing finite element ...
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Subsea BOP Tethering System as an Alternative for Mitigating Wellhead Fatigue
SPE/IADC International Drilling Conference and Exhibition, 2019Abstract More-accurate estimates of the fatigue damage on subsea wellhead might prolong the service lifetime of the equipment. Nevertheless, there might come to a point during the life of a well on which the fatigue capacity is nearly depleted, without the possibility of further interventions being carried out, and thus imposing the ...
L. Cantinelli Sevillano +3 more
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A New Generation 18¾-in.—15,000-psi Subsea Wellhead System
SPE Annual Technical Conference and Exhibition, 1982ABSTRACT A new generation 18-3/4" 15,000 p.s.i. subsea wellhead system has been specifically designed for deep-water high-pressure use. It features: (1) a breech-block profiled housing to receive a matching seat when only 3 strings are required or a 16" casing hanger for a fourth string, (2) a new seal assembly with 3 metal-to -metal ...
Benton F. Baugh +2 more
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High-Performance Metal-Seal System for Subsea Wellhead Equipment
Offshore Technology Conference, 1989ABSTRACT This paper presents the design of a metal-to-metal seal suitable for use in subsea wellheads along with some of its more salient performance characteristics. A Packoff Qualification Test Series being used to qualify the seal for subsea drilling service is also presented.
L.J. Milberger, C.F. Boehm
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Offshore Technology Conference
Abstract Monitoring of wellhead bending loads on subsea wells during operations with subsea blowout preventers (BOPs) deployed from mobile drilling rigs has gained widespread acceptance as a standard practice in recent years. The main purpose of such monitoring is to maintain structural well integrity (wellhead fatigue) and to support
Harald Holden +3 more
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Abstract Monitoring of wellhead bending loads on subsea wells during operations with subsea blowout preventers (BOPs) deployed from mobile drilling rigs has gained widespread acceptance as a standard practice in recent years. The main purpose of such monitoring is to maintain structural well integrity (wellhead fatigue) and to support
Harald Holden +3 more
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Dynamic Stability Evaluation of Subsea Wellhead Based on Fully Coupled Model
Ocean Engineering, 2022Xiuquan Liu, Na Qiu, Liangbin Xu
exaly