On 10 December 2019, Gran Tierra Energy (GTE) indicated the Cocona 1 outpost located approximately 1.3 km southwest of the Vonu 1 discovery within the PUT-1 Block was drilling ahead with plans to reach total depth by the end of 2019.  The Cocona 1 spudded on 27 November 2019.  The well had a planned total depth of 11,000 ft (3,353 m) and is targeting multi-zone reservoirs in the Upper Cretaceous age N, U sands and the A-Limestone.  The 463.96 sq km PUT-1 Block is owned and operated 100% by Gran Tierra Energy.  Background information  On 8 November 2019 Gran Tierra Energy (GTE) reported plans to spud the Cocona 1 exploration well late this month, located on the PUT-1 Block of the Putumayo Basin. It will be drilled from the Vonu Este pad and is the first appraisal well to be drilled for the Vonu 1 discovery. GTE's most successful Villeta A Limestone exploration well to date, the Vonu 1 was discovered in 2017 and is currently producing over 400 Bboe/d from the Villeta A.   On 5 June 2017 GTE had announced a multi-zone oil discovery in its Vonu 1 new-field wildcat (NFW) located on the PUT-1 Block. Log interpretation indicated oil saturation within six separate reservoirs having a cumulative pay thickness of some 157 ft true vertical depth (TVD). The well encountered 8.2 ft of net oil pay in the Villeta N Sand Member, 3.4 ft of net oil pay in the Villeta M1 Limestone Member, 8.7 ft of net oil pay in the Villeta M2 Limestone Member, 91.1 ft of net oil pay in the Villeta A Limestone Member, 15.3 ft of net oil pay in the Villeta U Sand Member and 30.7 ft of net oil pay in the Villeta T Sand Member. GTE expects to test all zones individually during June 2017. The Vonu 1 NFW was spudded on 6 May 2017 aimed at the multi-zone structural prospect defined on 3D seismic as separate from the adjacent Costayaco field. The directional well targeted the Caballos Formation, the Villeta U, T and N Sand Members and the Villeta A Limestone Member.
Cocona 1 nfw. (Gran Tierra Energy 100%) in PUT-1 block, PTD=3350m was to be reached by year-end, thus assumed under evaluation. Target Upper Cretaceous N + U sands and A-Limestone.