Multi-function dart
Methods and apparatus are provided for cementing a liner. In one embodiment, the method includes releasing a dart behind a cement; landing the dart in an activation seat; increasing pressure to activate a liner hanger; further increasing pressure to release the dart from the activation seat; landing the dart in a plug; and increasing pressure to release the dart and the plug. In one embodiment, releasing the dart from the activation seat comprises deforming the dart.
1. A method of cementing a liner having a liner hanger and disposed in a wellbore, the method comprising:
releasing a top dart into the wellbore after a cement is pumped into the wellbore;
landing the top dart in an activation seat;
applying a pressure to the top dart in the activation seat to activate the liner hanger;
increasing the applied pressure to release the top dart from the activation seat;
landing the top dart in a top plug; and
displacing the cement using the top dart and top plug.
2. The method of claim 1 , wherein releasing the top dart from the activation seat comprises deforming the top dart.
3. The method of claim 2 , wherein deforming the top dart comprises deforming a landing shoulder of the top dart.
4. The method of claim 1 , further comprising releasing a bottom dart into the wellbore prior to the cement being pumped into the wellbore.
5. The method of claim 4 , wherein the bottom dart includes a rupture disc.
6. The method of claim 4 , wherein the bottom dart lands in a bottom plug, and the method includes releasing the bottom dart and the bottom plug.
7. The method of claim 4 , wherein the bottom dart is configured to pass through the activation seat.
8. The method of claim 1 , wherein the top dart includes a second landing shoulder having an outer diameter larger than an outer diameter of a first landing shoulder.
9. The method of claim 8 , wherein the second landing shoulder is deformable to decrease its outer diameter.
10. The method of claim 8 , wherein releasing the top dart from the activation seat comprises releasing the top dart and the second landing shoulder from the activation seat.
11. The method of claim 10 , further comprising releasing the top plug with the top dart.
12. The method of claim 11 , further comprising releasing a bottom dart having a rupture disc into the wellbore prior to the cement being pumped into the wellbore.
13. The method of claim 1 , further comprising releasing the top plug with the top dart.
14. The method of claim 1 , wherein the top dart includes a fin, and increasing the applied pressure to release the top dart from the activation seat comprises releasing the top dart and the fin from the activation seat.
15. A method of cementing a liner in a wellbore, comprising:
releasing a bottom dart into the wellbore prior to a cement being pumped into the wellbore;
releasing a top dart into the wellbore after the cement is pumped into the wellbore;
landing the top dart in an activation seat;
activating a liner hanger of the liner by applying a pressure to the top dart in the activation seat;
releasing the second top dart from the activation seat;
landing the bottom dart in a bottom plug;
releasing the bottom dart and the bottom plug;
landing the top dart in a top plug;
releasing the top dart and the top plug;
conveying the top dart and the top plug through a bore of the liner; and
disposing the cement on an exterior of the liner.
16. The method of claim 15 , wherein releasing the top dart from the activation seat comprises deforming the top dart.
17. The method of claim 16 , wherein deforming the top dart comprises deforming a landing shoulder of the top dart.
18. The method of claim 17 , wherein releasing the top dart from the activation seat comprises releasing the landing shoulder of the top dart from the activation seat.
19. The method of claim 15 , wherein a landing shoulder of the bottom dart is smaller than a first landing shoulder of the top dart.
20. The method of claim 19 , wherein the top dart includes a second landing shoulder having an outer diameter that is larger than the first landing shoulder.
21. The method of claim 20 , wherein the second landing shoulder is deformable to decrease its outer diameter.
22. The method of claim 21 , wherein releasing the top dart from the activation seat comprises deforming the second landing shoulder.
23. The method of claim 15 , wherein the top dart includes a fin, and releasing the top dart from the activation seat comprises releasing the top dart and the fin from the activation seat.