Description / Application

Bilco's Riser Jet Tool is a solid mandrel valve with a 16" OD for use in 18 ³/₄" or larger BOP’s and risers.  It can be run in the clean-out/displacement string or can be introduced after short tripping the proper distance to tag the wellhead for depth control.  This tool is used to hydroblast the BOP cavities, removing lodged solids/debris and introducing them into the fluid stream while increasing annular velocities in the marine riser.  There are 18 .625" ID jet nozzles that direct fluid up, out, and down to thoroughly dislodge gunk and debris.  The number of nozzles and direction of flow can be configured to accommodate surface equipment and hydraulic concerns.

Operation

When the tool is positioned at the wellhead and rates have been established through the bit the Riser Jet Tool is activated by dropping a retrievable dart and shifting the tool to the open position.  This position directs all of the flow through the jetting nozzles.  The tool is then rotated slowly and reciprocated the appropriate distance to cover the stack.  At maximum achievable flow rate down work string plus maximum boost line rate the debris is introduced into the fluid stream and lifted into the riser.  A Bilco Riser Waste Retriever is generally run a double (64') above the jet tool to accomplish complete removal of the lifted solids.  After the jetting operation the tool is deactivated by dropping a second retrievable dart, which redirects the flow down the work string, back to the bit.  Fluid exchange operation can continue without the need for a designated trip to remove the jet and waste retriever tools.