Method and apparatus for setting an underwater drilling system

Details Method and apparatus for setting an underwater drilling system Method and apparatus for setting an underwater drilling system

E - Fixed Constructions

21

B

255/15, 255/8

E21B 7/128 (2006.01) E21B 7/124 (2006.01) E21B 7/20 (2006.01) E21B 17/02 (2006.01)

Patent

CA 1327966

ABSTRACT OF THE DISCLOSURE A method and apparatus for setting an underwater conduc- tor pipe, in which the conductor pipe is lowered into the wellhole on a drill string as the borehole is being formed by a drill bit and underreamer positioned at the end of the drill string below the end of the conductor pipe. The drill string and conductor pipe are detachably interconnected by a housing latch which includes means for detachably securing the drill string and drilling assembly to the conductor pipe. The drill string is provided with an upper latch sub, which retains and supports the drill string in its fully extended position within the conductor pipe, and a lower latch sub which retains and supports the drill string in the re- tracted position. As the apparatus is lowered a drill motor actuates the drilling assembly such that the well hole is formed in the ocean floor. Drilling continues until the permanent guide base of the conductor pipe engages the ocean floor. Thereafter, the upper latch sub is released and the drill string is retracted until the lower latch engages the latchhousing. The outer annulus of the conductor pipe is then cemented into place while pressure within the conductor pipe is maintained to prevent the cement from travelling up the inside of the conductor pipe. Once the cement is set, the latchhousing is released so that the drill string and latchhousing can be removed from the conductor pipe.

563872

Affiliated with

Also associated with

Rating

Method and apparatus for setting an underwater drilling system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for setting an underwater drilling system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for setting an underwater drilling system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1235135