Wire-line retrievable, mechanically operated spot valve

A spotting tool for use in placing a charge of liquid chemical downhole in a well by forcing the liquid down a tubing string, having a seating nipple or the like affixed to its lower terminus, for expulsion from the lower terminus, said tool comprising:

• A. an elongated, generally cylindrical having a generally axially aligned passage therethrough extending between first and second ends thereof;
• B. a valve disposed within said aligned passage intermediate the length thereof, said valve including a seat and a moveable valve member for selectively engaging and disengaging said seat to correspondingly close and open said passage for fluid communication therethrough;
• C. fluid seal means disposed circumferentially about said housing along at least a portion of the length thereof, said seal means being adapted to engage the internal walls of the tubing string and thereby effect a fluid seal in both axial directions therefrom;
• D. actuator means coupled to said moveable valve member, said actuator means including an axially directed rod portion directly affixed to said moveable valve member and extending through said passage beyond said first end of said housing;
• E. a frangible member adapted to transfix said actuator with said housing such that said moveable valve member normally sealingly engages said valve seat;
• and
• F. a diametrically directed aperture through said rod and corresponding radially directed and aligned apertures in the side walls of said housing, said apertures in said rod and said housing being substantially in alignment for receiving said frangible member when said moveable valve member is positioned to sealingly engage said valve seat;
• whereby an axial force applied to said rod portion serves to part said frangible member, thereby permitting said actuator to release said moveable valve member from said valve seat to establish a fluid communication path through said passage.