NNPC Contracts Halliburton To Run DSTs On Kolmani River
The Frontier Exploration Services (FES) Unit of the Nigerian National Petroleum Corporation (NNPC), has contracted American energy giants, Halliburton to run Drill Stem Tests (DSTs) and Tubing Conveyed Perforation (TCP) on the Kolmani River-2, in Bauchi State, in the Gongola Basin where oil search is ongoing.
A DST is a tool for measuring reservoir flow rates, and its application is usually an indication that the results of wireline logging have signalled that the well has encountered some commercial pool of hydrocarbon.
The company( which company) has kept a tight lid on information, but Africa Oil+Gas Report said in a release that several feet of natural gas and oil may have been encountered, although the case for commerciality is up in the air.
According to them, “The sand is better developed at this location and when we were to hang the 9 5/8 inch casing at some few feet deeper than 10,000feet (3,048metres), we were hardly able to find a shale level to hang. We are drilling with a water-based mud, so there are no issues about the stability of the wellbore,” the report quoted an unnamed source. The story changed in the 8 ½ inch hole. The rate of penetration of the drill bit was so low from 13,100ft to 13, 250ft, indicating tighter formation, the report said
“Kolmani-River-2 is being drilled to appraise 1999 gas discovery made by Shell in Kolmani River-1. The Anglo-Dutch major drilled the discovery well to a depth of 3,000metres (9,842feet), and Kolmani River-2 is planned to go close to 5,000feet deeper, to 4,350metres (14,270feet) than that, even though the location of the appraisal well is up-dip of the discovery well.
Shell didn’t test the discovery well, but went ahead and booked 33Billion standard cubic feet of gas as possible estimated recoverable reserves, based on some petrophysical results. NNPC, however, aims to collect as much geoscientific data as possible. “We are taking lots of sidewall cores, lots of fluid samples for PVT. The results are looking good.” The new well is being drilled by the Drillog operated Rig 101.