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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0857029 (1992-03-24) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 8 인용 특허 : 0 |
A subsea well assembly has a cement port closure sleeve which opens and closes a cement port in an outer wellhead housing. The outer wellhead housing secures to conductor pipe. An inner wellhead housing is lowered into the outer wellhead housing before the well is drilled past the conductor pipe, an
In a method of drilling a subsea well in which a tubular outer wellhead housing is secured to a string of conductor pipe and lowered into the well to a first depth, the improvement comprising: lowering an inner wellhead housing into the outer wellhead housing prior to drilling the well past the firs
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