Casing patch overshot
View Patent ↗A connection to a stub downhole is accomplished in a variety of ways. A string has a tapered lower end inserted into the stub and expansion occurs from within the tapered lower end into the stub to leave a connection without reduction of the internal diameter. An overshot fitting can be lowered outside the stub and the stub expanded from within against the overshot. Both options in a single tool can be used to get sealing around the inside and the outside of the stub. An adjustable swage can be used with the overshot configuration where the overshot has an internal groove. The adjustable swage expands from within the stub into the surrounding groove in the overshot.
1. A method of connecting a string to a tubular stub in a wellbore, comprising:
creating a stub by removal of a portion of a preexisting tubular from the wellbore;
inserting a lower end of the string into the stub when the stub is located downhole;
expanding said inserted lower end into connected sealing contact with said stub;
said stub is expanded with said lower end;
fixating said lower end to said stub with said expanding.
2. The method of claim 1 , wherein:
expanding said lower end to an inside diameter at least as large as that of said stub before said expanding.
3. The method of claim 1 , wherein:
providing a taper near the lower end of said string;
inserting the lower end of said string up to said taper into said stub; and
expanding from said taper to said lower end of said string.
4. The method of claim 1 , wherein:
providing at least one of a grip and a seal enhancing treatment on at least one of the stub and lower end of the string surfaces that come together from said expanding.
5. The method of claim 1 , wherein:
performing said expanding with a mechanical swage that is one of a fixed or variable dimension.
6. The method of claim 1 , wherein:
performing said expanding in one of an uphole and downhole direction.
7. The method of claim 1 , wherein:
providing an overshot component on said string to go over said stub;
expanding said stub to sealingly contact said overshot component.
8. The method of claim 7 , wherein:
providing at least one of a grip and a seal enhancing treatment on at least one of the stub and overshot component surfaces that come together from said expanding.
9. The method of claim 8 , wherein:
performing said expanding with a mechanical swage that is one of a fixed or variable dimension;
performing said expanding in one of an uphole and downhole direction.