System and method for snubbing under pressure

A system, comprising:

• a wellhead;
• a plug mounted in the wellhead, wherein the plug comprises:
• a body having a central bore and one or more radial fluid pathways configured to enable pressure equalization of a region above and a region below the plug;
• and
• an L-shaped slot in the body of the plug;
• a valve comprising a bearing between a first portion of the valve and a second portion of the valve, wherein the valve is configured to open and close the one or more radial fluid pathways through the plug;
• a pin protruding radially from the valve and disposed within the L-shaped slot;
• and
• a spring configured to bias the valve toward an open position.

A system, comprising:

• a running tool comprising:
• a rod configured to rotate;
• and
• an adapter coupled directly to the rod, the adapter is configured to removably connect or disconnect the running tool with a plug having a valve while in a wellhead, the adapter is configured to be positioned axially between the rod and the valve, wherein the adapter is configured to move the valve in the plug via only rotation followed by only axial movement or only axial movement followed by only rotation, and the axial movement of the valve is absorbed by the adapter such that the rod does not move axially relative to the plug when the valve opens.

A method, comprising:

• lowering a plug into a wellhead;
• equalizing pressure in a first region above and a second region below the plug while lowering the plug into the wellhead wherein equalizing pressure comprises opening a fluid pathway through the plug by opening a valve along the fluid pathway, and wherein opening the valve comprises rotating a tool coupled to the valve;
• mounting the plug in the wellhead;
• and
• closing the fluid pathway through the plug by closing the valve.

A system, comprising:

• a wellhead;
• and
• a plug mounted in the wellhead, wherein the plug comprises:
• a body, comprising:
• a central bore;
• and
• one or more radial holes in fluid communication with the central bore and with an exterior of the plug;
• a valve disposed within the central bore, wherein the valve is configured to open the one or more radial holes in an open position to equalize pressure above and below the plug while running the plug into the wellhead, and the valve is configured to close the one or more radial holes in a closed position after running the plug into the wellhead;
• a first axial ring and a second axial ring, wherein a first axial end of the valve contacts the first axial ring and a second axial end of the valve contacts the second axial ring as the valve moves between the first axial ring and the second axial ring;
• and
• a first spring between the first axial ring and the first axial end of the valve.

A system, comprising:

• a wellhead;
• and
• a plug mounted in the wellhead, wherein the plug comprises:
• a body, comprising:
• a central bore;
• and
• one or more radial holes in fluid communication with the central bore and with an exterior of the plug;
• a valve disposed within the central bore, wherein the valve is configured to open the one or more radial holes in an open position to equalize pressure above and below the plug while running the plug into the wellhead, and the valve is configured to close the one or more radial holes in a closed position after running the plug into the wellhead;
• and
• a spring configured to bias the valve towards the open position.

A method, comprising:

• lowering a plug into a wellhead;
• equalizing pressure in a first region above and a second region below the plug while lowering the plug into the wellhead wherein equalizing pressure comprises opening a fluid pathway through the plug by opening a valve along the fluid pathway, and wherein the plug comprises a spring configured to bias the valve toward an open position;
• mounting the plug in the wellhead;
• and
• closing the fluid pathway through the plug by closing the valve.