TUBING PRESSURE INSENSITIVE SURFACE CONTROLLED SUBSURFACE SAFETY VALVE

摘要

Method and systems for opening and closing a subsurface valve are disclosed. A rod piston forms a first piston chamber, a second piston chamber and a third piston chamber within a housing. The first piston chamber is fluidically coupled to a high tubing pressure and the second piston chamber is fluidically coupled to a surface control line and a first compartment of a storage chamber. The third piston chamber is coupled to a second compartment of the storage chamber. A flow tube couples the rod piston to a flapper. The rod piston is moved between a first position and a second position in response to a change in a pressure in at least one of the first piston chamber, the second piston chamber and the third piston chamber. The movement of the rod piston between the first position and the second position at least one of opens and closes the flapper.

主权项

1. A hydraulic control system for controlling operation of a downhole valve comprising:
a rod piston disposed within a housing,
wherein the rod piston and the housing form a first piston chamber, a second piston chamber and a third piston chamber; a high tubing pressure branch, wherein the high tubing pressure branch delivers pressure to the first piston chamber; a single control line, wherein the single control line delivers a surface pressure to the second piston chamber; a first storage chamber branch, wherein the first storage chamber branch fluidically couples a first compartment of a storage chamber and the second piston chamber; a second storage chamber branch, wherein the second storage chamber branch fluidically couples a second compartment of the storage chamber and the third piston chamber; and a flow tube coupled to the rod piston and a flapper,
wherein the flow tube moves between a first position and a second position in response to movement of the rod piston, andwherein movement of the flow tube between the first position and the second position is operable to at least one of open the flapper and close the flapper.