Quick connect coupling for cementing operations and the like

1. A coupling for releasably connecting a fluid conduit to a port, the coupling comprising:

a stinger assembly affixed to the conduit, the stinger assembly having a generally cylindrical stinger for carrying fluid from the fluid conduit to the port and a generally cylindrical breech lock barrel radially surrounding the stinger and presenting at least one raised key upon the breech lock barrel;

a breech lock connector associated with the port, the breech lock connector comprising a bore that is shaped and sized to receive the stinger and the breech lock barrel within the bore and having at least one radially inwardly projecting ridge;

wherein, the stinger assembly can be secured to the breech lock connector by inserting the stinger assembly within the bore at a rotational angle wherein the at least one key is angularly unaligned with the at least one ridge and then rotating the stinger assembly so that the at least one key is located behind and angularly in line with the at least one ridge; and

a locking assembly comprising a locking pin that is retained within a sleeve and is axially shiftable within the sleeve between a locked position, wherein the pin is inserted into an indentation on the breech lock barrel, thereby preventing rotation of the stinger assembly within the bore, and an unlocked position, wherein the pin is removed from the indentation, thereby allowing rotation of the stinger assembly within the bore.

2. The coupling of claim 1 further comprising a handle that radially surrounds the stinger.

3. The coupling of claim 1 wherein there is a plurality of keys and a plurality of ridges.

4. The coupling of claim 1 further comprising a lifting eye for lifting the stinger assembly.

5. The coupling of claim 1 further comprising:

a first anti-rotation dog located on the breech lock barrel; and

a second anti-rotation dog in the bore, the first and second anti-rotation dogs shaped and sized to abut each other radially to limit rotation of the stinger assembly within the bore.

6. A coupling releasably connecting a cement conduit to a cement swivel associated with a wellbore cementing tool, the coupling comprising:

a stinger assembly affixed to the cement conduit, the stinger assembly having a generally cylindrical stinger for carrying cement from the cement conduit to the cement swivel and a generally cylindrical breech lock barrel radially surrounding the stinger and presenting a plurality raised keys upon the breech lock barrel;

a breech lock connector on the cement swivel, the breech lock connector comprising a bore that is shaped and sized to receive the stinger and the breech lock barrel within the bore and having a plurality of inwardly projecting ridges;

wherein, the stinger assembly can be secured to the breech lock connector by inserting the stinger assembly within the bore at a rotational angle wherein the keys are angularly unaligned with the ridges and then rotating the stinger assembly so that the keys are each located behind and angularly in line with a ridge;

an anti-rotation dog located on the breech lock barrel; and

an anti-rotation dog in the interior bore, the anti-rotation dogs of the breech lock barrel and the bore shaped and sized to abut each other radially to limit rotation of the stinger assembly within the interior bore.

7. The coupling of claim 6 further comprising a locking arrangement for securing the stinger against rotation within the breech lock connector.

8. The coupling of claim 6 wherein the locking arrangement comprises:

a locking pin that is retained within a sleeve and is axially shiftable within the sleeve between a locked position, wherein the pin is inserted into an indentation on the breech lock barrel, thereby preventing rotation of the stinger assembly within the bore, and an unlocked position, wherein the pin is removed from the indentation, thereby allowing rotation of the stinger assembly within the bore.

9. The coupling of claim 6 further comprising a handle that radially surrounds the stinger.

10. The coupling of claim 6 further comprising a lifting eye for lifting the stinger assembly.

11. A method for releasably coupling a cement conduit stinger assembly to a bore within a cement swivel associated with a wellbore cementing tool, the method comprising the steps of:

moving the stinger assembly proximate a bore within the cement swivel, the stinger assembly having a stinger with a breech lock barrel that presents a radially outwardly projecting key;

orienting the stinger assembly so that the key is angularly unaligned with an inwardly-projecting ridge within the bore;

axially moving the stinger and breech lock barrel of the stinger assembly into the bore;

rotating the stinger assembly so that the key is angularly aligned behind the ridge, preventing the stinger assembly from being withdrawn from the bore; and

flowing cement from the cement conduit into the cement swivel.

12. The method of claim 11 further comprising locking the stinger assembly against rotation with respect to the cement swivel by axially shifting a locking pin that is shiftable within a sleeve from an unlocked position, wherein the pin is removed from an indentation on the breech lock barrel, thereby allowing rotation of the stinger assembly within the bore, to a locked position wherein the pin is inserted into the indentation thereby preventing rotation of the stinger assembly within the bore.

13. The method of claim 12 wherein the step of locking the stinger assembly comprises moving a locking pin associated with the cement swivel into seated engagement within an indentation on the stinger assembly.