The rupture disk (RD) tubing string testing (TST) bypass valve is a weight-activated, normally open valve. It is run in the workstring to prevent pressure buildup below the tester valve while stinging into a production type packer or while setting a retrievable packer during a well test. It is a “one shot” type tool that must be removed from the well to re-open it.

Features and Benefits

The tool is composed of three major sections:

• The bypass port section consists of an upper adapter, ported mandrel,

and ported nipple. The upper adapter contains two 1/4 NPT ports. Pressure applied to the lower port shifts the ported mandrel up. Pressure applied to the upper port shifts the ported mandrel down. This allows the tool to be pressure tested at the surface prior to going in the well.

• The metering section contains an air chamber and an oil chamber separated by a metering cartridge. Once the tool has been triggered, the operating mandrel in the section

moves up, closing the bypass ports. This section provides a 10 to 20-minute delay, depending upon the hydrostatic pressure, in the closure of the ports.

. The trigger section is composed of a rupture disk nipple, splined housing, floating piston, splined mandrel, and lower adapter. The splined mandrel, floating piston,

and splined housing form a hydraulic ram whenever weight is applied. The resultant pressure is transmitted to a rupture disk in the rupture disk nipple. This prevents any upward movement of the splined mandrel until the correct weight is applied to shear the rupture disk.