Downhole safety valve for central circulation completion system
作者： Harold B. Skeels
DOI:
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摘要: A downhole safety valve for a central circulation completion system (12) which comprises an inner tubular member (26) that extends through outer (28) and production bore is defined between the members. The (10) generally cylindrical body (78) includes surface (94) axially body. secured to sealed thereby form pressure barrier first portion of located below second above further at least one flow passage (112) communicates portions bore, closure disposed across control fluid bore.
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