Guide sleeve for use with side pocket mandrel

A side pocket mandrel for use in a gas lift or chemical injection system, the side pocket mandrel comprising:

• a central body;
• a side pocket that is laterally offset from the central body;
• a primary flow bore that extends through the central body, wherein the primary flow bore comprises:
• a discharge section that has a first inner diameter (D1);
• an inlet section that has a third inner diameter (D3);
• and
• a guide sleeve section between the discharge section and the inlet section, wherein the guide sleeve section has a second inner diameter (D2) that is larger than the first inner diameter (D1) and the third inner diameter (D3);
• a guide sleeve installed within the guide sleeve section, wherein the guide sleeve includes a locking pin aperture;
• and
• a locking pin, wherein the locking pin extends into the locking pin aperture through the central body and guide sleeve section, wherein the locking pin includes an extensible tip that is configured to extend into the locking pin aperture when the guide sleeve is in a correct rotational position within the side pocket mandrel.