Title: Split stack blowout prevention system

Abstract: A blowout prevention system for an offshore structure positioned on the underwater bottom in a body of water which contains moving ice masses that could force the structure off location wherein a surface blowout preventer stack for conventional well control is connected to the upper end of a riser with the lower end of the riser being disconnectably connected to a subsurface blowout preventer stack which provides the necessary well control should the structure be forced off location. The subsurface stack is positioned on a wellhead located in a chamber in the subsea bottom and is disconnectably connected to the riser so that the riser may be quickly removed from the subsea bottom should the structure be forced off location.

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Inventors: Steddum, Riddle E. (Houston, TX, US)
Ray, Donald R. (Houston, TX, US)
Crager, Bruce L. (Houston, TX, US)

Application Number: 896264
Filing Date: 1978-04-14
Publication_date: 1980-03-18
Assignee: Chevron Research Company (San Francisco, CA)
Primary Class(es): 166/359 166/55, 405/211
Other Classes:
US Patent Ref:

3179179	Apr, 1965	Kofahl	166/363.
3189098	Jun, 1965	Haeber	166/367.
3195639	Jul, 1965	Pollard et al.	175/7.
3324943	Jun, 1967	Price	175/7.
3461957	Aug, 1969	West	166/351.
3561526	Feb, 1971	William, Jr. et al.	166/55.
3592263	Jul, 1971	Nelson	166/351.
3793840	Feb, 1974	Mott et al.	405/211.
3866676	Feb, 1975	Burns	166/363.
3871184	Mar, 1975	Schirtzinger	175/9.
4046191	Sep, 1977	Neath	166/75.
4080797	Mar, 1978	Thompson	405/217.

Other Refs:
Primary Examiner: Leppink, James A.
Assistant Examiner: Favreau, Richard E.
Attorney: Freeland, Jr.; R. L., Egan, III; William J.