Product Code: WBI PDS 0007
The Pressure Activated Circulating Sub (PACS) is a flow activated tool which is a replacement for the conventional drop ball Circulating Sub. As it is flow actuated, the tool can be opened and closed as many times as required. The tool has two positions; flow through and circulating. Switching from one position to another is achieved by simply turning the pumps off and on again.
The PACS tool uses hydraulic pressure to move an internal piston which stops in one of two positions each time the tool is cycled. This hydraulic pressure comes from the pressure created by fluid flowing through either the tools below or an internal nozzle. These two positions allow the fluid to pass through the tool to the BHA below or out of the circulating ports into the annulus.
Application:
- Allows for increased flow rate giving higher annular velocities which can assist in hole cleaning.
- Can be used to circulate acid or nitrogen without damage to the motor or other tools below.
Features:
- When in circulating mode, increasing the pump rate opens up the flow ports to compensate, thus no increase in pressure drop is seen across the BHA.
- Unrestricted through bore minimises washout damage and allows for the passage of drop balls, if required.
- Tools below isolated from flow when in circulating mode.
- The pump rate through the tool can be increased or decreased as required in either mode as the tool will not switch position until the pumps are turned off.
- Eliminates the need to wait for an activation ball to arrive at the tool, cycling from one position to the other takes only a few seconds.
- If required, the two positions can be used to 'split' the fluid flow. For example one mode forces 100% of the fluid to the BHA and when cycled the fluid is split to 60% to the BHA and 40% to the circulating ports. When drilling with a PDM this allows the operator to selectively increase the flowrate for more effective hole cleaning whilst continuing to drill at the same time.
Note: The equipment specifications provided are for information purposes only and may be subject to change without notice.
