초록 ▼

An apparatus for protecting blowout preventers during well fracturing and/or stimulation treatments is disclosed. The apparatus includes a hollow spool with spaced-apart inner and outer sidewalls that define an annular cavity. A mandrel is forcibly reciprocatable in the cavity. The mandrel includes

An apparatus for protecting blowout preventers during well fracturing and/or stimulation treatments is disclosed. The apparatus includes a hollow spool with spaced-apart inner and outer sidewalls that define an annular cavity. A mandrel is forcibly reciprocatable in the cavity. The mandrel includes an annular seal at a bottom end for sealingly engaging a bit guide attached to a top end of the casing. The apparatus is mounted above a BOP attached to a casing spool of the well before well stimulation procedures are begun. The mandrel is stroked down through the BOP to protect it from exposure to fluid pressure as well as abrasive and/or corrosive well stimulation fluids, especially extreme pressures and abrasive proppants. The advantage is a simple, easy to operate apparatus for protecting BOPs which provides full access to the well casing with well servicing tools to facilitate well stimulation at pressures approaching the burst pressure rating of the well casing.

대표청구항 ▼

[ I claim:] [1.] Apparatus for protecting a blowout preventer from exposure to fluid pressure as well as abrasive and/or corrosive fluids during a well fracturing and/or stimulation treatment to stimulate production, comprising:a spool having a spool top end, a spool bottom end, and spaced-apart inn

[ I claim:] [1.] Apparatus for protecting a blowout preventer from exposure to fluid pressure as well as abrasive and/or corrosive fluids during a well fracturing and/or stimulation treatment to stimulate production, comprising:a spool having a spool top end, a spool bottom end, and spaced-apart inner and outer sidewalls that extend between the spool top end and the spool bottom end;the spool bottom end adapted to be mounted above a blowout preventer;the spool top end adapted for the attachment of another spool, or a union;a mandrel having a mandrel top end and a mandrel bottom end, the mandrel top end being received in an annular cavity between the inner and outer sidewalls and forcibly reciprocatable within the cavity, and the mandrel bottom end including annular sealing means for high pressure sealing engagement with a top end of a casing of the well;whereby, when the spool is mounted above a blowout preventer, the mandrel can be stroked down through the blowout preventer until the sealing means sealingly engages a top end of the casing to isolate the blowout preventer and protect it from exposure to fluid pressure as well as abrasive and/or corrosive fluids during well stimulation treatments, and stroked up out of the blowout preventer after the well has been stimulated.