Nexus Energy Limited announced that the Longtom-4 development well in Production License VIC/L29 in the Gippsland Basin, offshore Victoria, was preparing to drill ahead the 9 1/2 inch pilot hole. Since last week the 10 3/4 inch casing was run and cemented to a depth of 2,591 meters measured depth below the rotary table (MDRT) and the subsea tree was installed on the sea floor.
The pilot hole will now be drilled to intersect the deeper section of the Longtom field which is anticipated to contain the major portion of gas reserves in this part of the field. The horizontal section of the well will then be drilled to intersect lengthy intervals of the two deepest sands as shown on the cross section below.
Drilling and logging of the pilot hole will be followed by the drilling, completion and production testing of the horizontal section of the well. Longtom-4 is then planned to be suspended as a future gas producer, awaiting connection to the pipeline later this year.
Longtom-4 is being drilled by the West Triton jackup and is the second development well for the Longtom gas project. The Longtom-3 well, drilled during the third quarter of 2006, is ready for commercial production with no further rig intervention required. The flow capacity of Longtom-3 alone is expected to be sufficient to supply the anticipated maximum contract rate requirements for the Longtom field. Timing of a planned third development well will depend on the results of Longtom-4 and the field’s production performance over time. The current plan assumes this well will be drilled two to three years after project start-up.
Gas produced from the Longtom wells will enter a new 12 inch pipeline and will be transported from the field to the end of Santos’ existing Patricia-Baleen pipeline, 19 kilometers away. Nexus will construct this pipeline and the associated control lines and equipment. The raw gas will then continue along the Patricia-Baleen pipeline to shore where it will be processed at Santos’ existing onshore gas plant. Santos will install new equipment at the plant capable of processing the Longtom gas. This will primarily involve facilities for the stripping of condensate from the gas and the subsequent stabilization, storage and export of the condensate.
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