Short Description:

The dual-acting circulation valve is used to establish a circulation passage between the inside of the coiled tubing and the annulus. When the tool string needs to be circulated from the middle of the pipe string, the circulation hole is opened to establish a circulation channel by means of pitching pressure.When the tool is stuck and is buried, and the flow is too small to pump the ball normally, open the rupture disk by holding the pressure to increase the flow, and then cut the pin by pitching a ball to open the circulation valve to clean the well with large displacement.