Device and a method for disconnecting a tool from a pipe string
A disconnection device for disconnecting a tool and a pipe string comprises a first connection part releasably connected to a second connection part by means of a locking device and a release object. The release object is soluble by means of, for example, acid.
1. An apparatus for disconnecting a tool from a tubular string comprising:
a lock;
a lock retainer;
a biasing member for biasing the lock retainer to release the lock; and
a dissolvable member configured to retain the lock retainer to maintain the lock in a locked position.
2. The apparatus of claim 1 , wherein the lock is a split ring.
3. The apparatus of claim 1 , wherein the lock retainer is a sleeve.
4. The apparatus of claim 3 , wherein the sleeve couples a first connection portion to a second connection portion.
5. The apparatus of claim 4 , wherein the first connection portion is coupled to the tubular string and the second connection portion is coupled to the tool.
6. The apparatus of claim 1 , wherein the dissolvable member is coupled to a hydraulic circuit for operating a downhole tool.
7. The apparatus of claim 1 , wherein the dissolvable member is a tubular release.
8. The apparatus of claim 7 , further comprising a weak section of the release.
9. The apparatus of claim 8 , wherein the weak section consists of reduced wall thickness.
10. The apparatus of claim 1 , further comprising a solution for dissolving the dissolvable member.
11. The apparatus of claim 10 , wherein the solution is an acid.
12. The apparatus of claim 1 , wherein the biasing member is a spring.
13. A method of disconnecting a tool from a tubular siring comprising:
running a tool into a wellbore, wherein the tool is coupled to the tubular string by:
a lock;
a lock retainer;
a biasing member for biasing the lock retainer to release the lock; and
a dissolvable member configured to retain the lock retainer to maintain the lock in a locked position;
flowing a solution through the tubular string;
dissolving at least a portion of the dissolvable member with the solution;
disconnecting the tool from the tubular string by the biasing member moving the lock retainer.
14. The method of claim 13 , wherein the solution is an acid.
15. The method of claim 13 , wherein a portion of the dissolvable member has a reduced wall thickness in order to facilitate dissolving.
16. The method of claim 13 , wherein the lock is a split ring.
17. The method of claim 13 , wherein the lock retainer is a sleeve.
18. The method of claim 17 , wherein the sleeve couples a first connection portion to a second connection portion.