The Client
Comet Ridge is listed on the Australian Securities Exchange with the ASX Code: COI and is based in Brisbane. The Company’s flagship gas project comprises the Mahalo Gas Hub assets located in central Queensland, 240 kilometres to the major gas demand centre of Gladstone.
The Mahalo Gas Hub assets comprise the following permits:
- Mahalo Gas Project – an extensively appraised coal seam gas project (currently owned 40% by Comet Ridge and 30% each by Santos and APLNG) with certified gas reserves and Petroleum Leases awarded; and
- Northern Mahalo Projects – comprising Mahalo North, Mahalo East, and Mahalo Far East. These projects are 100% owned and operated by Comet Ridge and are being appraised to add new gas reserves either as stand-alone gas projects or to complement the Mahalo Gas Project development.
The Project
We were selected by Comet Ridge to construct the first dual lateral, dual intercept well in the Mahalo Gas Project for Comet Ridge.
Our Services
The well, Struan 3, includes lateral sections in two coal seams, both of which intersect the previously drilled vertical well Struan 2. The well has a total in-seam length of 2.3km.
The Outcome
Struan 2, the vertical intercept well drilled prior to Struan 3 as its target, intersected a total net coal package of 8.29 metres. The Castor Seam intersected at Struan 2 was slightly thicker than predicted at 3.75 metres and the Pollux Seam was split, with one of the two ply’s being 1.23 metres thick. The well was initially directionally drilled and cased into the Castor Seam, before drilling down into the lower Pollux Seam, where it was geo-steered through the seam, intersecting the previously drilled Struan 2 vertical well before drilling out further into the coal reservoir. Due to the thin nature of the Pollux ply in this lateral, geosteering effort required more peaks and troughs in the wellbore path, which limited the length drilled. A total length of 822 metres was drilled, of which 88% was within the seam. A 3-1/2” diameter, pre-perforated production liner was run into this lateral section. After drilling the Pollux, the drill string was pulled back to the upper Castor Seam and then geo-steered through the Castor, intersecting the Struan 2 vertical well (for the second time) and was drilled to a total length of 1512 metres, achieving 95% within seam. This lateral section was also lined.
Partners and Contractors
Contractors included: Silver City Drilling, Schlumberger Wireline and Pathfinder, NOV Coring, WellPro Cementing, AMC Oil and Gas, and MPC Kinetic.
Learn more:
Learn more about the project, here.
