Sub Standard Graphics 3D JMA181487 00000

812WAB® isolates shale collapse on exploration well

  • WELL TYPE
    Gas / appraisal
  • RESERVOIR TYPE
    Sandstone
  • ISOLATION OF SHALE COLLAPSE
    Provided tangible DST results from producing zone
  • OPEN HOLE PLACEMENT OF WAB
    Isolated any potential for shale collapse
  • WAB APPLICATION VERSATILITY ENABLED
    Preferred well methodology
  • OPERATIONAL FOCUS ENSURED
    All objectives met in this challenging application
  • LOCATION
    Malaysia

Background

A vertical carbonate exploration well in the Ginseng field, Petronas offshore Malaysia, was expecting heavy losses and possible shale formation collapse. This was the client's first exploration well since the downturn. After installing the completion the client planned to do well testing before completing P&A of the well.

Solution

Welltec® offered a Welltec Annular Barrier® (812WAB7.5:5) solution as a primary plan as part of a contingency liner to isolate total losses and support the formation from shale collapse above. The 812WAB was made up as part of the 7’’ contingency liner and expanded to 8-1/2’’ OH size.

As no losses were encountered. The WAB was installed to support the formation from shale collapse. The lower completion consisted of a 812WAB mounted on 4-1/2’’ base pipe was made up and x-over to the 7 in liner. The WAB & liner hanger was set simultaneously against the 3-1/2’’ pre-installed HPHT bridge plug.

Achievement

This was the second successful WAB installation for this IOC following on from the installation within a cemented mono-bore campaign. The WAB supported the formation from shale collapse allowing the successful evaluation of hydrocarbon potential via well testing. Zero Non-production time.

Due to well changes during drilling i.e. no losses, the setting of the WAB was constantly changing. This was of substantial benefit to the client, due to the versatility of the WAB and being able to set in open hole or cased hole.
Welltec

The WAB’s application versatility, allows for adaptive changes in well design during milestone exploration well.

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Product Applied