DOWNHOLE SWIVEL SUB

摘要

The invention relates to a swivel sub for a string to be lowered into a wellbore and a method of operation in a wellbore, wherein such swivel sub is used and comprises: a first end provided with connection means for connecting a bottom section of a string; a second end provided with connection means for connecting an upper section of the string; a first member, including the first end and a sleeve portion opposed to the first end; a second member including the second end and comprising a section op posed to the second end and partially located within the sleeve portion; the first member and the second member being arranged to rotate relative to each other.

主权项

1. Method of operation in a wellbore, including a step of deploying a string within said wellbore, wherein a swivel sub (100) is provided, said swivel sub (100) comprising:
a first end (114) provided with connection means for connecting a bottom section of a string; a second end (115) provided with connection means for connecting an upper section of the string; a first member (101), including said first end (114) and a sleeve portion (101′) opposed to said first end (114); a second member (102) including said second end (115) and comprising a section (102′) opposed to said second end (115) and partially located within the sleeve portion (101′); the first member (101) and the second member (102) being arranged to rotate relative to each other, and wherein the first end (114) of said swivel sub (100) is connected to a bottom section of the string, the second end (115) of said swivel sub (100) is connected to an upper section of the string, and the upper section of the string is rotated in a first direction during deployment of said string in the wellbore while said bottom section is not rotating.