Apparatus and method for hanging coiled tubing in wells
OwnerAldon J. Valletinventor
Life of this patent
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Abstract
A dognut for use in the installation of a string of coiled tubing in an oil or gas well features a construction and assembly which enables the dognut to be installed on the tubing, the dognut and tubing to be landed in place in the tubing spool, the dognut seal to be activated and the assembly of the dognut, dognut seal, tubing and tubing spool to be pressure tested for leakage prior to cutting the coiled tubing above the dognut and putting the wellhead under pressure from the producing formation. This dognut installation adds to the safety and ease of completing the coiled tubing installation in oil or gas wells.
Claims8
A split dognut assembly for use with coil tubing on a wellhead having a spool, the split dognut assembly comprising:
- a split dognut having means to grip coil tubing;
- a split seal dimensioned to fit snugly between the spool and the coil tubing on one side of the split dognut, the seal being limited in movement by the split dognut;
- and
- means to provide axial compression on the seal towards the split dognut and force the seal into sealing engagement with the spool and coil tubing.
A method of installing coiled tubing having a weight in a well using a split dognut mounted in a spool, the split dognut having means to grip the coiled tubing, the method comprising the steps of:
- clamping the split dognut onto the coiled tubing;
- securing an expandable seal onto the coiled tubing with the expandable seal limited in movement in one direction by the split dognut;
- and
- compressing the expandable seal by force applied towards the split dognut into sealing engagement with the coiled tubing and the spool.
Dependencies are inferred from the claim text.