Spring collar shoulder

1 . A spring shoulder kit comprising:

an expanding shoulder insertable into an inner wall of a collar disposed in a wellbore, the expanding shoulder including:

a ring;

a finger axially extending from and flexibly pivotable relative to the ring, the finger having a first end; and

a wedge outwardly radially extending from the finger at the first end, the wedge being configured to matingly radially outwardly snap into a groove defined in the inner wall of the collar; and

a retaining sleeve slidably insertable into the expanding shoulder along the finger to block inward radial movement of the wedge,

wherein the spring shoulder kit is configured to support an axial load of an internal assembly in the collar disposed in the wellbore, and the spring shoulder kit is configured to be positioned completely inside the collar between opposite axial ends of the collar, and

wherein the retaining sleeve comprises a cylindrical wall extending axially from an annular flange, an inner diameter of the retaining sleeve is constant along an entire axial length of the retaining sleeve, an outer diameter of the retaining sleeve is larger along the annular flange than the cylindrical wall, the annular flange is configured to axially abut a first axial end of the expanding shoulder, the cylindrical wall is configured to extend inside of the expanding shoulder from the first axial end to an internal shoulder of the expanding shoulder, and the internal shoulder is disposed at an internal chamfer extending to a second axial end of the expanding shoulder.

2 . The spring shoulder kit of claim 1 , wherein the retaining sleeve defines an innermost circumference of the spring shoulder kit along the entire axial length of the retaining sleeve.

3 . The spring shoulder kit of claim 1 , wherein;

the finger is one of a plurality of fingers radially arranged about a longitudinal axis of the expanding shoulder; and

the wedge is one of a plurality of wedges, each wedge of the plurality of wedges respectively outwardly radially extending from at least one of the plurality of fingers.

4 . The spring shoulder kit of claim 1 , wherein the wedge has an upper chamfer connected to a lower side.

5 . The spring shoulder kit of claim 1 , wherein the finger has a lead-in feature configured to facilitate insertion of the retaining sleeve into the expanding shoulder.

6 . The spring shoulder kit of claim 1 , wherein the wedge is circumferentially wider than the finger.

7 . The spring shoulder kit of claim 1 , wherein the cylindrical wall of the retaining sleeve slidably engages the finger during an axial movement of the retaining sleeve into an inserted position within the expanding shoulder, and the retaining sleeve is configured to outwardly radially bias the finger in the inserted position of the retaining sleeve within the expanding shoulder.

8 . The spring shoulder kit of claim 7 , wherein, in a locked state, an end of the cylindrical wall of the retaining sleeve abuts the internal shoulder of the expanding shoulder.

9 . The spring shoulder kit of claim 7 , wherein the outer diameter of the cylindrical wall is sized to engage a tip of the finger when the expanding shoulder is in a compressed state.

10 . The spring shoulder kit of claim 7 , wherein when the expanding shoulder is in a compressed state within the collar, the retaining sleeve is useable as a tool to axially push the expanding shoulder along the inner wall of the collar until the wedge snaps into the groove defined in the inner wall of the collar, followed by the axial movement of the retaining sleeve into the expanding shoulder to block radial movement of the finger and the wedge.

11 . The spring shoulder kit of claim 7 , wherein, in a locked state within the collar, the annular flange of the retaining sleeve abuts a tip of the finger.

12 . The spring shoulder kit of claim 1 , wherein the finger is thinner in wall thickness than the ring.

13 . The spring shoulder kit of claim 1 , wherein the wedge acts as a lead-in feature configured to facilitate insertion of the expanding shoulder into the collar.

14 . The spring shoulder kit of claim 1 , wherein, when moving from a relaxed state to a locked state, the wedge moves radially outwardly relative to a longitudinal axis of the expanding shoulder.

15 . A collar assembly comprising:

a collar configured to be disposed in a wellbore, the collar including an inner wall defining a groove; and

a spring shoulder kit selectively removably placeable within the collar disposed in the wellbore, the spring shoulder kit including:

an expanding shoulder insertable into the inner wall of the collar disposed in the wellbore, the expanding shoulder including:

a ring;

a finger axially extending from and flexibly pivotable relative to the ring, the finger having a first end; and

a wedge outwardly radially extending from the finger at the first end, the wedge being configured to matingly radially outwardly snap into the groove defined in the inner wall of the collar; and

a retaining sleeve slidably insertable into the expanding shoulder along the finger to block inward radial movement of the wedge,

wherein the spring shoulder kit is configured to support an axial load of an internal assembly in the collar disposed in the wellbore, and the spring shoulder kit is configured to be positioned completely inside the collar between opposite axial ends of the collar, and

wherein the retaining sleeve comprises a cylindrical wall extending axially from an annular flange, an inner diameter of the retaining sleeve is constant along an entire axial length of the retaining sleeve, an outer diameter of the retaining sleeve is larger along the annular flange than the cylindrical wall, the annular flange is configured to axially abut a first axial end of the expanding shoulder, the cylindrical wall is configured to extend inside of the expanding shoulder from the first axial end to an internal shoulder of the expanding shoulder, and the internal shoulder is disposed at an internal chamfer extending to a second axial end of the expanding shoulder.

16 . The collar assembly of claim 15 , wherein the annular flange is slidably insertable along the inner wall of the collar.

17 . The collar assembly of claim 15 , wherein when the expanding shoulder is in a locked state with the wedge snapped into the groove, the retaining sleeve abuts the internal shoulder of the expanding shoulder.

18 . A method comprising:

axially inserting an expanding shoulder of a spring shoulder kit into an inner wall of a collar disposed in a wellbore until a wedge of the expanding shoulder radially outwardly snaps via a radially flexible finger into an internal groove defined in the inner wall of the collar; and

inserting a retaining sleeve of the spring shoulder kit into the expanding shoulder until the retaining sleeve contacts an internal shoulder of the expanding shoulder to outwardly radially hold the wedge in the internal groove, wherein the retaining sleeve has a radially outwardly extending flange slidably insertable along the inner wall of the collar, wherein the spring shoulder kit is configured to support an axial load of an internal assembly in the collar disposed in the wellbore, and the spring shoulder kit is configured to be positioned completely inside the collar between opposite axial ends of the collar.

19 . The method of claim 18 , wherein the wedge matingly fits into the internal groove.