Oilex Ltd reported that oil has been recovered at the surface in cased hole Drill Stem Test (DST) #2 of the Al Khlata Sandstone in the Sarha-1 well located in Exploration and Production Sharing Agreement Block 56, Oman. This result achieves the primary test objective of confirming the presence of moveable oil in the anomalous zone interpreted from well logs and cuttings in this formation.
A series of remedial cementing operations were performed above and below the interpreted hydrocarbon zone behind casing to isolate the interval from water bearing sandstones prior to commencing DST #2 over the interval 1,255 to 1,284 metres Measured Depth. A progressive cavity pump was run as part of the test string to recover the water cushion and drilling fluid lost to the formation and to provide additional lift to the produced fluids.
Although pump rates were varied in an attempt to establish a stabilised oil flow rate, the well produced erratically and was still cleaning up when the test was terminated. During the intermittent flow periods a total of 87 barrels of fluid was recovered, with up to 90% oil cut in the latter stages of the test.
Pressure and fluid data will be analysed to determine reservoir and oil properties for the DST#2 interval. Initial indications are that oil gravity is approximately 21.5 degrees API. Preparations are underway to conduct DST #2A by adding additional perforations over the interval 1,285 to 1,295 metres MD to incorporate better quality Al Khlata reservoir section near the base of the oil column.