DHA - Downhole Actuator for WFV™
Tubing conveyed, reservoir control
The Welltec DHA Downhole Actuator is a robust, Bi-directional shifter, designed to be deployed on the tailpipe of upper or intermediate completions, to facilitate the mechanical opening / closing of Welltec large bore WFV (Welltec Flow Valve).
The DHA provides controlled access to multiple zones isolated during the safe deployment of upper / intermediate completion.
In the latter part of 2019, three successful deployments of Welltec’s Advanced Well Architecture (AWA) system, part of the Open Hole Intelligent Completion Petrobras...
Furthermore the DHA can be incorporated within applications that require periodical work-over, such as ESP or HSP type wells, for isolation of producing zones, via manipulation of WFV, to allow for work-over in a safe and stable well-bore environment.
The Welltec DHA will engage within the mandrel of the large bore WFV, and through application of set down weight will shift the WFV to open and via overpull will shift the WFV to close.
The Welltec DHA will then pass through, giving a confirmation load signature at surface. Should any issues arise, the DHA incorporates an emergency release mechanism to ensure unimpeded passage in and out of the well bore.
| Rigid OD | 5.79" |
|---|---|
| Key relaxed diameter, max | 6.37" |
| Key collapsed diameter, min | 5.79" |
| Minimum ID | 3.49" |
| ID drift diameter | 3.38" |
| Length | 89.31” |
| Max. operating temperature | 257°F |
| Tensile strength | 250 klbf |
| Compressive strength | 350 klbf |
| Quality grade | ISO 14998:2013 Q1 |