The Locator Seal Nipple is designed to seal the tubing string to the retainer, allowing the casing to be isolated from high pressure while testing or during pressure operations.
The tubing can be tested by circulating a test ball down the tubing. The ball will seat in the top of the seal nipple and provide positive shut-off to the tubing string. Pressure can then be applied to the tubing string.
After testing is completed the test ball can be reverse circulated out of the tubing string. After the ball is retrieved the job can be completed by lowering the tubing to sting into the retainer or by raising the tubing to sting out of the retainer.
