Woodside Petroleum has added a fifth well to its Myanmar drilling program, following successful results from the Thalin deepwater discovery. The company also revealed it has made some progress in narrowing alternative ideas for the development of Browse basin offshore Western Australia, which does not seem to include a floating liquefied natural gas (FLNG) concept.
Map of Thalin. From Woodside.
The Thalin-1B appraisal well, a re-entry and sidetrack of Thalin-1A, was spudded in late February. The sidetrack was successful and Thalin-1B acquired 99m (100% recovery) of core and wireline logs over the objective reservoir interval, Woodside confirmed in its Q1 2017 report.
Block AD-7 is in the Bay of Bengal, some 100km offshore of the west coast of Myanmar. Water depth at Thalin-1A is 836m, which is the northern part of the Rakhine Basin.
Woodside says that initial multi-rate drill stem test results from the lower reservoir section of Thalin-1B demonstrated sustained flow rates of approximately 50 MMcf/d for a 50-hour flow period on a 48/64in choke. The deliverability test indicated excellent reservoir quality, and preparations for a drill stem test of the upper reservoir are continuing.
Woodside’s plans include for the Thalin-1B to be followed by the Thalin-2 appraisal well in Block AD-7. An additional firm exploration well has been committed to as part of the 2017 Myanmar drilling campaign, which now comprises five firm wells consisting of two appraisals and three exploration wells; and two contingent wells. Two exploration wells will be drilled in Block A-6 after Thalin-2, followed by a further exploration well in Block AD-7.
Production testing of the Thalin field in Myanmar established high reservoir deliverability and reservoir properties in line with expectations, says Woodside.
“In Myanmar, our interpretation of seismic data has identified an additional low-cost exploration target with upside potential in Block A-6, which contains the Shwe Yee Htun-1 discovery. This increases our Myanmar firm well schedule for 2017 to five,” says Woodside CEO Peter Coleman.
Offshore Australia, Woodside says that along with its joint venture partners in the Browse Basin, it has made significant progress in narrowing alternative concepts for the development of Browse.
“Woodside prefers a concept utilizing existing LNG process infrastructure on the Burrup Peninsula, subject to reaching acceptable terms with the Burrup infrastructure owners. Woodside continues to target the selection of a Browse development concept in 2H 2017,” says the company.
In March 2016, Woodside and its partners scrapped plans for the struggling Browse FLNG mega project, as a result of the current economic and market environment.
The Browse FLNG development, which was expected to reach a final investment decision in 2H 2016, is based on three FLNG facilities utilizing Shell’s FLNG technology and Woodside’s expertise to commercialize the Brecknock, Calliance and Torosa fields.
The fields, 425km offshore north of Broome at 300-700m water depth, are expected to contain gross (100%) contingent resources (2C) of 15.4 Tcf of dry gas and 453 MMbbl of condensate. The Torosa field, the first of the fields discovered, was found in 1971. Brecknock followed in 1979, and Calliance came later in 2000.
Also off Western Australia, Woodside says that environmental approval was obtained for the Swell-1 exploration well offshore Exmouth. Swell-1 is targeting a deep undrilled Triassic fault block. It is scheduled to spud in mid-2017.