Welltec DHA Shifter 00002

DHA - Downhole Actuator for WFV™

Tubing conveyed, reservoir control

Introduction

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), thus providing controlled access to multiple zones isolated during the safe deployment of upper / intermediate completion.

  • Challenge
    Advanced Well Architecture
    Zonal control
  • Applications
    Shifting Welltec Flow Valves, safe deployment in unconventional wells
Welltec DHA Shifter 00001
DHA Shifter Draft
Welltec DHA Shifter 00002

Case highlight

CHALLENGE
Advanced Well Architecture

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 Design, were installed in the ultradeep-water, pre-salt environment offshore Brazil...

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Overview

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.
Welltec DHA Shifter Vert 00000
Welltec DHA Shifter Hori 00000

APPLICATIONS

  • Multi zone open hole completions
  • ESP Producers
  • HSP Producers

FEATURES

  • Debris tolerant design
  • Bi-directional
  • Emergency release
  • Full bore ID

BENEFITS

  • Multiple open/close capability
  • Robust life of well design
  • No reduction to production ID

SPECIFICATIONS

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