However, during UBD, formation gas
constantly enters into the wellbore, which severely disturbs the background gas value.
While drilling in the Pre Khuff, formation gas
flowed into the T-02 well bore on a number of occasions.
In the gas exploration program in Queensland (Beach 23.2%, Santos Ltd (Santos) 60.06% and operator, Origin Energy Resources Ltd (Origin) 16.5%, Australia Pacific LNG (APL) 0.24%), the Kaiden-1 well was drilled to total depth of 3,094 metres and cased and suspended as a Paning Member and Toolachee Formation gas
Similarly, blowouts often occurred during the pipe removal part of a trip due to formation gas
(trip gas) entering the hole and lightening the mud column.
Messenger wells and the deeper liquids-rich Kapuni Formation gas
Electric logs indicate the well intersected gas bearing Namurian Millstone Grit Formation (Carboniferous) at 10029ft and indications of formation gas
are seen from mudlogs down to 11440ft.
The new train, combined with the recently approved third train, will increase the capacity to process gas from Apache's Jurassic formation gas
reserves to 710 MCF/day of gas and 66,000 b/d condensate, including access to processing capacity at Shell's Obaiyed plant.
If large amounts of formation gas
flow into the wellbore, the downhole mud weight is reduced because of the nature of low density of gas.
In the gas exploration program in Queensland (Beach 23.2%, Santos Ltd (Santos) 60.06% and operator, Origin Energy Resources Ltd (Origin) 16.5%, Australia Pacific LNG (APL) 0.24%), the Bolah-1 well was drilled to total depth of 2,863 metres and cased and suspended as a Toolachee Formation and Patchawarra Formation gas
Beyond that, if need be, there remain the prospects for the growth of the industry related to exploiting non-conventional reserves from coal-bed methane, tight formation gas
, geo-pressured gas, and gas from fractured shales, as well as ultra-deep gas...