Extreme DST Combination Valve

Improve DST data accuracy and efficiency, reduce rig time

Improve perforation cone quality and get accurate shut-in test data while improving efficiency and reducing safety risks.

The Baker Hughes extreme DST combination valve (xDCV) contains both a ball valve and a circulating valve that are cycled with annular pressure. It is ideal for use in drillstem testing (DST) to determine the economic viability of a reservoir, and can also be run with tubing-conveyed perforating (TCP) systems to establish underbalance and improve reservoir communication.

The xDCV is run with a nitrogen chamber and annular reference trap system, which act together to minimize the nitrogen pressure necessary to charge the valve on surface, reducing risks to personnel working on HPHT wells. The nitrogen chamber and annular trap system are run above a retrievable packer in a cased-hole test string. The annular reference trap system can be reset downhole if pressures or fluid weights change, dramatically increasing reliability and eliminating the need to bring the tool to surface to re-pressurize the nitrogen chamber.

The Baker Hughes xDCV improves DST data accuracy and efficiency, reduces rig time, and provides an effective underbalance solution for leaving clean perforations during TCP operations.


  • HPHT wells
  • DST operations
  • Underbalanced perforating operations

Tubing-Conveyed Perforating

Improve reservoir connectivity to maximize production. Future stimulation treatments are more effective at reduced cost.

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