Roxi has updated the market with news of the deep discovery at its flagship BNG asset, in addition to updates for the shallow wells at BNG and the Deep Well NK-31 at Galaz.
Deep Well A5
On 1 September 2014, Roxi announced the thickness of the gross oil-bearing interval commencing at 4332 m was at least 105 m, between 4332 m and 4437 m.
It was also announced for safety reasons related to different pressure and temperature conditions at lower depths that Roxi had decided to complete the well at 4442 m. Once the well has been completed after running and setting 114 mm liner, flow testing will commence.
Roxi intends to undertake the flow test in the middle of Q4 2014, following well completion.
Deep Well Airshagyl 6 (A6)
As announced on 1 September, a new Deep Well A6, with a planned total depth of 4700 m, will target principally the middle Carboniferous formation of the South Emba sub-basin from 4390 m, with a secondary target in the Permian formation at 4120 m.
Deep Well A6 is expected to be spudded by the end of 2014 and will be located 2000 m from Deep Well A5. Following completion of a tender process, Roxi will look to enter into a fixed price turnkey drilling contract with a Kazakh drilling company.
Following the experience of drilling Deep Well A5, Roxi has a much better understanding of the geology of this part of the BNG Contract Area. The company will also use a rig with a 450 t carrying capacity, which has a greater operating range than the rig used to drill Deep Well A5.
Roxi expects the total depth at Deep Well A6 to be reached in approximately 4 months from the spud date. Roxi also expects the results from Deep Well A6 will help determine the extent to which the oil-bearing interval discovered at Deep Well A5 extends below 4437 m.
BNG Shallow Wells
Roxi’s approach to the South Yelemes portion of the BNG Contract Area has been to drill several wells to prove the size of the area over which oil discovered in the Valanginian extends. Wells 54, 805, 806 and 807 all drilled to depths between 2500 and 3000 m have all produced oil from the Valanginian and Jurassic and are considered by Roxi to be commercial.
Well 143, which was drilled to a total depth of 2750 m in 2013, is located approxmiately 5 km from Well 806 and should Well 143 test positive in the Valanginian then the probability of significant quantities of recoverable oil from this horizon would be much increased.
Initial results from wells tests between 1943 m and 1950 m in Valanginian horizon are expected by the end of September.
Galaz Well NK-31
Well NK-31, which is targeting the Middle Jurassic on the main Contract Area, has been drilled to a total depth of 2642 m with casing set to its full length.
Core samples taken between 2070 and 2079 m in the Karagansaisky horizon contain an interlayering of argillite and conglomerates.
High gas shows were detected when drilling at the depth of 2283 m (Doshan Suite). Core samples were taken between 2283 and 2292 m and preliminary, analysis showed the core consists of sandstones.
Well NK-31 will be tested between 2445 m and 2468 m in Doshan Suite with initial test results expected by the end of September.
Clive Carver, Roxi Chairman, commented: "In response to market interest we are pleased both to be able to provide more clarity on the timing of the eagerly anticipated flow tests on Well A5 and the plans for follow up well A6."
Adapted from press release by Katie Woodward
Read the article online at: https://www.oilfieldtechnology.com/drilling-and-production/08092014/roxi-provides-updates-on-bng-and-galaz-assets-1410/