Popular Name： Internal Pressure-Operated Circulating Valve / IPO Circulating Valve
The Internal Pressure-Operated Circulating Valve ( IPO Circulating Valve) is a single-shot circulating valve that allows circulation through the workstring before trip-out and serves as a drain valve during trip-out. It can be run in cased holes or open holes and maintains a full bore through the tool. The IPO Circulating Valve is used in the following situations:
- When a full-opening string is needed
- When redundant backup to annulus pressure-operated circulating valves is needed
- When a limited amount of annulus pump pressure is available to operate annulus pressure tools
Features
1) Requires no string manipulation to operate the tool
2) Permits passage of wireline tools through full-opening bore
Operation
The IPO circulating valve is operated by internal pressure (500 to 10,000 psi above hydrostatic). The pressure required to operate the tool is determined by shear pins, which hold the sliding valve in the closed position. To open the valve, tubing pressure is increased to a pressure above annulus hydrostatic equal to the sheer value of the shear pins. Once operated, the IPO Circulating Valve is locked open.
1) Other sizes available on request.
2) Meets requirements of NACE-0175 (>175°F)
3) The values of tensile, burst, and collapse strength are calculated with new tool conditions.
4) Pressure rating is the differential pressure at the tool. (Differential pressure is the difference in pressure between the casing annulus and the tool ID.)