Pacific Rubiales Energy has made a new oil discovery at the Quifa 26X well, located in Prospect F in northern Quifa. It has also provided the results of the Quifa 31 and Quifa 23X wells, drilled on prospects G and H, respectively, within the Quifa Block, Llanos basin, Colombia.
The Quifa 26X exploratory well was drilled on Prospect F, in the northern part of the Quifa block, approximately 15.1km to the east of the recently discovered Quifa 6 well on prospect A. The Quifa 26X well was drilled slanted to a maximum of 69.1 degrees from a surface location and reached the objective at an angle of 5 degrees.
The well found the top of the Carbonera basal sands at 4,611ft measured depth (MD), or 2,594ft true vertical depth at sub-sea level (TVDSS). The well found the oil water contact at 4,676ft MD, or 2,659ft TVDSS, resulting in an oil column of 65ft gross at the well.
The company said that the petrophysical evaluation of the well indicates a net pay zone of 41ft with 29% average porosity. The Quifa 26X well was drilled at the northeastern flank of prospect F, 1.6km away from the top of the structure, which has been mapped at 2,550ft TVDSS.
The depth difference between the crest of the structure of prospect F and the oil water contact observed in the well indicates that the maximum hydrocarbon column for the prospect could reach 108ft. The structure of prospect F has an area of approximately 12,950 acres and elongates close to 13km in the southwest-northeast direction and 4km crosswise.
This discovery, along with the discovery of the Quifa 6 well, confirms the hydrocarbon potential of the northern area of the Quifa block. The company is planning to continue the exploratory drilling campaign for this area during the remainder of this year.
The Quifa 31 well was drilled as the third appraisal well for the Quifa-7 discovery well on Prospect H. The well found the top of the Carbonera basal sands at 2,810ft MD, or 2,194ft TVDSS and the oil-water contact at 2,846ft MD, or 2,230ft TVDSS, resulting in an oil column of 36ft at the well. The petrophysical evaluation of the well logs indicates a net pay zone of 26ft, and an average porosity of 29%.
The Quifa 31 well was drilled slanted 30 degrees from a surface location, about 1km south from the Quifa-7 well, and 1.7km from the Quifa 11 well to the west. The results of this well, along with the results of the Quifa-7 discovery well and the Quifa-10 and Quifa-11 appraisal wells, extend the total area for prospect H to 5,175 acres (it was previously estimated to be 4,780 acres), with average net pay of 20.5ft and 31% porosity.
After a preliminary test, the well initiated production at 415bopd at 13.6 degree API, using a progressive cavity pump (PCP). The company is now planning an extended production test for the well.
The Quifa 23X exploratory well, drilled on prospect G, near the northern border of the Quifa Block, found the top of the Carbonera basal sands at 3,332ft MD, or 2,755ft TVDSS and the top of the Paleozoic at 3,536ft MD or 2,959 TVDSS.
The Quifa Block is an exploratory block that almost completely surrounds the Rubiales/Piriri Field. The company holds a 60% interest in this block in association with Ecopetrol (40%). The Quifa contract gives Pacific Rubiales the right to develop any discovery until 2031.