ZJS5 data9 Sep 2014 00:25
ZSJ5 was a vertical appraisal well drilled to a depth of 2,155 m MDBRT and discovered a number of potential tight gas pay zones which showed similarities to the neighbouring Sanjiaobei and Linxing discoveries. Initial results from petrophysical analysis indicated that ZJS5 had encountered nine potential gas pay zones with a total thickness of 56 m. The 4/5 seam and 8/9 seams were intersected at 2051 m and 2108 m respectively and although thicker (8 m and 9 m) than in the northern wells they are too deep for a viable standalone CBM development. The well was cased to allow future testing. In December 2012 two unstimulated sandstone intervals (1,552 m - 1,555m and 1,560 m – 1,564 m) in the Shiqianfeng were tested using underbalanced perforating technology. No commercial flows were achieved and a rise in liquid level up to 1,037 m within 24hrs of perforation is interpreted to be due to formation water breakthrough from the upper perforated interval. On 28 May 2013, Leyshon announced that following the hydraulic facture stimulation Shiqianfeng (Q5) interval in well ZJS5 a free gas flow rate of 160,000 scf/day has been achieved over eight hours of stable flow at a tubing head pressure of 200 psi.