The Brownfield’s BX Lock Mandrel is a positive blank off tool designed to be run into an X Type Profile Nipple, holding pressure from both above and below.

The Brownfield’s BXN Lock Mandrel is a similar tool, designed to be run into an XN Type Bottom No-Go Nipple, holding pressure from both above and below.


Two wireline trips are required to set the BX and BXN Type Plugs. The first trip involves locking the plug body into the nipple. Since the by-pass ports are
exposed during this operation, the plug body remains in an equalized state. Once the plug body is properly installed in the nipple, the prong is run into the plug body. This blanks off the ports.

To pull the plug the prong must first be pulled to allow equalization to occur. Once equalized, the plug body is retrieved from the nipple.

The mandrel features keys with square, locking shoulders to land in selective BX nipple profiles. The shoulders bear the pressure loading from above. Replacing the BX keys with BXN keys converts the lock from BX to BXN.


The mandrel sets slickline flow controls during completion, installation, and production. Typical controls include the following:

  • Pump-through plugs for injecting fluids into the well
  • Blanking plugs for shutting in a well or testing the tubing
  • Instrument hangers for temperature and pressure recorders
  • Downhole chokes for reducing surface flowing pressures
  • Pump-open plugs for a temporary tubing plug that can be pumped open and
    used for production without running slickline