Oryx Tested Discovered Oil in Iraq
Posted: 10/26/2013 03:10:21 Edited: 10/26/2013 03:10:21 Clicks: 1083
Oryx has made a commercial oil and gas discovery at Ain Al Safra, indicating that the company had made a second oil discovery on the Hawler license in Iraq.
Oryx is holding 65% shares and working interest in the multiwell appraisal and development drilling program under which it would estimate the AAS-1 discovery well next year.
The company is testing the base of the Alan formation and the Mus formation. By using 20/64-in. and 16/64-in. chokes, the company has been successful develop the well while in 58m, two internals has been drilled.
One choke size produced 850b/d oil flow rates while the other 675b/d over 8-hr flow periods when the fixed chokes are used. In total 38 hr test, various of choke sizes are adopted to test the oil flow. Oryx also recorded 36 hr of pressure build-up for the test.
Oryx said the rise of the heavy mud which functioned as controlling the well has influenced the performance during the test. The well was cleaning up in the end of the test,
18° to 29° gravity oil samples was expected to be analyzed in the next stage. While the estimation shows the gas and oil ration was 160 scf/bb, while hydrogen sulfide is contained 20%.
The AAS-1 well targeted oil potential primarily in the Lower Jurassic and Triassic and secondarily in the Cretaceous. The well was expected to drill to 3,700m. But the heavy losses of drilling fluids has stuck the bottomhole assembly and the delay of the drilling, the well was only drilled to 3039.
There is sign of different kinds of oil in the Cretaceous, Jurassic, and Lower Jurassic which the well has been drilled. Due to the wet Cretaceous reservoir, the oil quality had not been tested.
In the Lower Jurassic reservoirs, there are large amounts of oil flowing to surface. The test show that the oil was on the shakers and large drilling fluid loss.
Oryx is analyzing the AAS-1 results. And it expected to drill another appraisal well in 2014. It also plans to appraise the well in Triassic Kurra Chine formation, besides the appraising discovery in the Alan and Mus formations.
