Abstract: An equalizing subsurface safety valve for controlling fluid flow in a well conduit comprises a tubular body member having a longitudinal bore extending therethrough, a flapper hingably connected within the tubular body member to alternately permit and prevent fluid flow through the longitudinal bore, means for biasing the flapper to a normally closed position to prevent fluid flow through the longitudinal bore, a flow tube longitudinally movable within the longitudinal bore for controllably opening the flapper, fluid passage formed within the tubular body for providing fluid communication between the longitudinal bore adjacent a first side of the flapper and a second side of the flapper, and a closure member mounted across the fluid passage adjacent the first side of the flapper and movable along an axis generally transverse to the longitudinal bore.

Abstract: A well lock including a landing nipple having a locking notch and landing shoulder and a lock for setting in the nipple. The lock includes a body and at least one retractable no-go dog radially movable in the body and adapted to engage the landing shoulder and at least one locking dog radially movable in the body and adapted to lock in the locking notch. A rigid expander tube telescopically moves in the body between a running and a set position. In a running position the no-go locking dogs are cammed outwardly while the locking dogs are retracted. When the set position is reached the locking dogs are cammed outwardly and a recess is aligned with the no-go dogs for allowing them to retract. A seal is provided between the body and the expander tube for protecting the nipple from well fluid abrasion.