Bi-directional swivel sub with lugs

1. An apparatus, comprising:

a connector sub rigidly securable to a conveyance for running the connector sub along a wellbore, the connector sub having a connector lug;

a spool mandrel coupled to the connector sub and having a mandrel lug, wherein the spool mandrel is rotatable with respect to the connector sub, and wherein contact between the connector lug and the mandrel lug bounds rotation of the spool mandrel with respect to the connector sub between a first angular position and a second angular position; and

a control line extending between the connector sub and the spool mandrel, wherein the control line is displaceable in response to rotation of the spool mandrel with respect to the connector sub.

2. The apparatus of claim 1 , wherein the spool mandrel is bi-directionally rotatable with respect to the connector sub.

3. The apparatus of claim 1 , wherein rotation of the spool mandrel is bounded in a first direction by contact between a first side of the connector lug and a first side of the mandrel lug and is bounded in a second direction by contact between a second side of the connector lug and a second side of the mandrel lug.

4. The apparatus of claim 1 , wherein the first angular position and the second angular position are between 270 to 360 degrees apart.

5. The apparatus of claim 1 , wherein the connector lug extends axially outward from a downhole end of the connector sub, and wherein the mandrel lug extends axially outward from an uphole end of the spool mandrel.

6. The apparatus of claim 1 , wherein a downhole end of the connector sub is axially offset from an uphole end of the spool mandrel.

7. The apparatus of claim 1 , wherein the connector lug and the mandrel lug each span between five degrees and forty-five degrees of a corresponding circumference of the connector sub and the spool mandrel, respectively.

8. The apparatus of claim 1 , wherein the mandrel lug is angularly offset from the connector lug by 135 to 225 degrees in a neutral position of the spool mandrel.

9. The apparatus of claim 1 , further comprising a retainer sub disposed radially exterior to the connector sub and the spool mandrel, wherein the retainer sub restrains axial movement of the spool mandrel with respect to the connector sub to couple the spool mandrel to the connector sub.

10. The apparatus of claim 1 , further comprising a shear member initially holding the spool mandrel in a neutral position between the first and second angular position, wherein the shear member is shearable in response to a threshold force applied to an interface surface of the shear member.

11. The apparatus of claim 10 , wherein the shear member comprises a shear pin securing the spool mandrel to a retainer sub, and wherein the retainer sub is rigidly secured to the spool mandrel.

12. The apparatus of claim 1 , wherein the connector sub and the spool mandrel each comprise a tubular shape.

13. The apparatus of claim 1 , wherein a radially inner connector surface of a downhole end of the connector sub has a greater diameter than a radially outer mandrel surface of an uphole end of the spool mandrel, and wherein the uphole end of the spool mandrel is disposed within the downhole end of the connector sub.

14. The apparatus of claim 13 , wherein the connector lug extends radially inward from the radially inner connector surface of the connector sub, and wherein the mandrel lug extends radially outward from the radially outer mandrel surface of the spool mandrel.

15. An apparatus, comprising:

a connector sub rigidly securable to a conveyance for running the connector sub along a wellbore, the connector sub having an axially extending connector lug;

a spool mandrel coupled to the connector sub and having an axially extending mandrel lug, wherein the spool mandrel is rotatable with respect to the connector sub, and wherein contact between the connector lug and the mandrel lug bounds rotation of the spool mandrel with respect to the connector sub between a first angular position and a second angular position;

a control line extending between the connector sub and the spool mandrel, wherein the control line is displaceable in response to rotation of the spool mandrel with respect to the connector sub; and

a return spring configured to bias the spool mandrel to rotate toward a neutral angular position of the spool mandrel with respect to the connector sub.

16. The apparatus of claim 15 , wherein a first end of the return spring is attached to the connector lug, and wherein a second end of the return spring is attached to the mandrel lug.

17. The apparatus of claim 15 , wherein the return spring comprises a compression spring, a tension spring, a torsion spring, or some combination thereof.

18. The apparatus of claim 15 , wherein the control line is coiled about the spool mandrel in the neutral position, wherein the control line uncoils in response to rotation of the spool mandrel in a first direction, and wherein the control line recoils in response to rotation of the spool mandrel in a second direction.

19. A method for mating a downhole swivel sub to a downhole tool, comprising:

running a swivel sub into a wellbore via a conveyance, wherein the swivel sub comprises:

a connector sub rigidly securable to a conveyance for running the connector sub along a wellbore, the connector sub having an axially extending connector lug;

a spool mandrel coupled to the connector sub and having an axially extending mandrel lug, wherein the spool mandrel is rotatable with respect to the connector sub, and wherein contact between the connector lug and the mandrel lug bounds rotation of the spool mandrel with respect to the connector sub between a first angular position and a second angular position; and

a control line extending between the connector sub and the spool mandrel, wherein the control line is displaceable in response to rotation of the spool mandrel with respect to the connector sub; and

actuating a shear mechanism to shear a shear pin restraining rotation of the spool mandrel with respect to the connector sub;

driving the swivel sub into the downhole tool to couple the swivel sub with the downhole tool, wherein the spool mandrel rotates with respect to the connector sub to a position between the first angular position and the second angular position in response to driving the swivel sub into a downhole tool; and

disengaging the swivel sub from the downhole tool in response to an unsuccessful coupling of the control line with the downhole tool, wherein a return spring drives the spool mandrel to rotate toward a neutral angular position of the spool mandrel with respect to the connector sub in response to disengaging the swivel sub from the downhole tool.

20. The method of claim 19 , wherein the shear mechanism is configured to actuate in response to the shear mechanism contacting the downhole tool.