Hydraulic control fluid communication nipple

A hydraulic control fluid communication nipple for switching control fluid from one location to a second location in a well comprising,

• a body,
• a fluid passageway in the body adapted to be connected to the well surface for normally receiving hydraulic control fluid for supplying hydraulic control fluid to a first location,
• vertically moving means in the body shutting off communication of fluid to said first location, and
• said vertically moving means in the body opening communication of said fluid passageway to a second location in the body,
• the means in the body opening communication of said fluid passageway to a second location in the body includes,
• said passageway extending to said second location,
• a metal frangible screw having a longitudinal axis extending vertically and having threads screwed into and blocking the passageway adjacent the second location with a metal-to-metal seal,
• said screw having a cavity exposed to the passageway,
• a vertically moving breaking sleeve positioned to engage and break the screw in tension and expose the cavity to the second location.

A hydraulic control fluid communication nipple for switching control fluid from one location to a second location in a well tool comprising,

• a body,
• a fluid passageway in the body adapted to be connected to the well surface for receiving hydraulic control fluid for supplying hydraulic control fluid to a first and a second location,
• a metal plug aligned with a portion of said fluid passageway and positioned to be moved into said portion and shut off communication of fluid to said first location, said plug normally being positioned out of said portion whereby hydraulic fluid can be supplied to said first location,
• a metal breakable screw having a longitudinal axis extending vertically into the passageway adjacent the second location and having threads screwed into and initially blocking said passageway with a metal-to-metal seal, said screw having a cavity exposed to the passageway, and
• a vertically moving breaking sleeve positioned to engage said screw and break said screw in tension and expose the cavity to the second location and said sleeve adapted to engage move said plug into said portion of the passageway for shutting off communication of said passageway with the first location.