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A surface controlled subsurface safety valve for use in a well tubing string including a valve closure member, an operator tube for opening the valve closure member, an annular piston on the operator tube responsive to control fluid pressure conducted from the well surface, and a spring biasing the

A surface controlled subsurface safety valve for use in a well tubing string including a valve closure member, an operator tube for opening the valve closure member, an annular piston on the operator tube responsive to control fluid pressure conducted from the well surface, and a spring biasing the operator tube to a position closing the valve. A lockout sleeve mounted in tandem with the operator tube for movement to a position in which the lockout sleeve holds the valve open. The operator tube having multiple flow paths and barriers to prevent accumulation of debris from well fluids within the safety valve. One flow path including a plurality of small ports extending through the upper portion of the operator tube. Another flow path defined in part by a reduced outside diameter portion of the operator tube near its lower end and multiple channels in the valve housing adjacent thereto.

대표청구항 ▼

A safety valve for downhole use in well comprising: a. housing means having a longitudinal bore extending therethrough; b. valve closure means mounted in the housing means to control fluid flow through the longitudinal bore; c. the valve closure means having a first position which allows fluid flow

A safety valve for downhole use in well comprising: a. housing means having a longitudinal bore extending therethrough; b. valve closure means mounted in the housing means to control fluid flow through the longitudinal bore; c. the valve closure means having a first position which allows fluid flow through the longitudinal bore and a second position which blocks fluid flow therethrough; d. an operator tube in the housing means to shift the valve closure means from its second position to its first position; e. means for moving the operator tube in response to a control signal from the well surface; f. a plurality of small ports extending through the upper end of the operator tube; and g. the small ports defining an acute angle relative to the longitudinal axis of the operator tube whereby fluid flow is directed to clean the interior of the housing means adjacent thereto.