(ShareCast News) - South America-focused oil and gas producer and explorer Amerisur Resources announced an update on the drilling of well Platanillo-24 in Colombia on Monday.The AIM-traded firm said Platanillo 24 was drilled under time and under budget, to a total depth of 8,485ft measured depth, achieving an offset of 1,275 ft to the east of Platform 3N.It said the well was designed as an infill well on the most northern developed lobe of the Platanillo field, located between wells Platanillo 7 and 17.The reservoir section was logged and initial log analysis indicated the presence of 67.5ft gross, 38ft net oil column in the U sand formation.Amerisur said the analysis of T sand indicated a 14ft gross and 8ft net oil column.The N sand was not well developed at that location, which was in line with the company's seismic attributes model.It said the well was currently being completed for commercial production from the U sand and it is expected to produce into the Pad 3N facilities.Subject to resolution of local social protests, the company added that it plans to mobilise the Serinco Rig D-10 to Pad 2N, in order to drill Platanillo 22, the first appraisal well from Pad 2N, the furthest north pad on the Platanillo block."Platanillo 24 is a good result, the second of our planned infill wells," said chief executive John Wardle."The well was drilled to TD in just over 15 days at a cost of under $2M."I look forward to successfully initiating production from the U sand."