Well plunger systems

1. An apparatus for removing liquids from a well, comprising:

a body having a first open end, a second open end, and a channel extending from the first open end through the body to the second open end;

a receiver disposed at the first open end, the receiver configured to receive a stopper through the first open end and to at least partially seal off the channel to enable the apparatus to remove liquids from the well, the first open end including a retention member receiver configured to receive a c-ring for applying a retention force to the stopper when the stopper is engaged with the receiver, wherein the stopper is maintained in place in the receiver by the c-ring applying the retention force to the stopper when the stopper is engaged with the receiver; and

the c-ring having an inside edge and an outside edge, wherein the inside edge imparts the retention force to the stopper.

2. The apparatus of claim 1 , wherein the receiver has an upper surface contour for engaging an upper surface contour of the stopper, where the upper surface contour of the receiver only partially matches the upper surface contour of the stopper.

3. The apparatus of claim 2 wherein the c-ring includes a cut-out for allowing the c-ring to expand or contract.

4. The apparatus of claim 3 wherein the stopper and the c-ring have relative sizes such that the stopper will pass through the c-ring when the c-ring is expanded.

5. The apparatus of claim 4 wherein the stopper and the c-ring have relative sizes such that the stopper will not pass through the c-ring when the c-ring is contracted.

6. The apparatus of claim 5 wherein the stopper is maintained in place in the receiver by the c-ring when the c-ring is contracted.

7. The apparatus of claim 6 , further comprising a port disposed through a sidewall of the body and into the channel for allowing fluid to flow between the channel and an outside of the body when the stopper is maintained in place in the receiver by the c-ring.

8. The apparatus of claim 1 , further comprising a port disposed through a sidewall of the body and into the channel for allowing fluid to flow between the channel and an outside of the body when the stopper is maintained in place in the receiver by the c-ring.

9. The apparatus of claim 1 wherein the inside edge of the c-ring is radiused.

10. An apparatus, comprising:

a body having a first open end, a second open end, and a channel extending from the first open end through the body to the second open end;

a receiver disposed at the first open end, the receiver configured to receive a stopper configured to at least partially seal off the channel, the first open end including a retention member receiver configured to receive a c-ring for applying a retention force to the stopper when the stopper is engaged with the receiver, wherein the stopper is maintained in place in the receiver by the c-ring applying the retention force to the stopper when the stopper is engaged with the receiver;

the receiver further including an upper surface contour for engaging an upper surface contour of the stopper, where the upper surface contour of the receiver only partially matches the upper surface contour of the stopper; and

the c-ring having an inside edge and an outside edge, wherein the inside edge imparts the retention force to the stopper.

11. The apparatus of claim 10 wherein the c-ring includes a cut-out for allowing the c-ring to expand or contract.

12. The apparatus of claim 11 wherein the stopper and the c-ring have relative sizes such that the stopper will pass through the c-ring when the c-ring is expanded.

13. The apparatus of claim 12 wherein the stopper and the c-ring have relative sizes such that the stopper will not pass through the c-ring when the c-ring is contracted.

14. The apparatus of claim 13 wherein the stopper is maintained in place in the receiver by the c-ring when the c-ring is contracted.

15. An apparatus for removing liquids from a well, comprising:

a body having a first open end, a second open end, and a channel extending from the first open end through the body to the second open end;

a receiver disposed at the first open end, the receiver configured to receive a stopper through the first open end and to at least partially seal off the channel to enable the apparatus to remove liquids from the well, the first open end including a retention member receiver configured to receive a c-ring for applying a retention force to the stopper when the stopper is engaged with the receiver, wherein the stopper is maintained in place in the receiver by the c-ring applying the retention force to the stopper when the stopper is engaged with the receiver;

the c-ring having an inside edge and an outside edge, wherein the inside edge imparts the retention force to the stopper; and

the c-ring having a cut-out for allowing the c-ring to expand or contract.

16. The apparatus of claim 15 wherein the stopper and the c-ring have relative sizes such that the stopper will pass through the c-ring when the c-ring is expanded.

17. The apparatus of claim 16 wherein the stopper and the c-ring have relative sizes such that the stopper will not pass through the c-ring when the c-ring is contracted.

18. The apparatus of claim 17 wherein the stopper is maintained in place in the receiver by the c-ring when the c-ring is contracted.

19. The apparatus of claim 18 , wherein the receiver has an upper surface contour for engaging an upper surface contour of the stopper, where the upper surface contour of the receiver only partially matches the upper surface contour of the stopper.

20. The apparatus of claim 19 , further comprising a port disposed through a sidewall of the body and into the channel for allowing fluid to flow between the channel and an outside of the body when the stopper is maintained in place in the receiver by the c-ring.