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Tuesday, May 12, 2015
Serinus Energy Inc. updated its Winstar-13 well onshore Tunisia on the Sabria Field. According to the company production testing of WIN-13 commenced on April 28, initially through on-site equipment, and was switched into the flowline on May 5. It is producing 41.5°API light oil and solution gas, consistent with the rest of the field. The test data has the well flowing at an average rate of 147 bpd of oil and 298 Mcf/d of natural gas. Initial flow was mostly water as drilling and completion fluids that had been lost to the formation during those operations were recovered. The water cut has dropped continuously since then to its current level of 19%.
The current oil rate is fluctuating between 125 – 175 bpd with a gas-oil ratio of 2,200 ft3 per bbl and a flowing wellhead pressure of 403 psi. In contrast, the Winstar-12bis well averaged 553 bpd at a flowing pressure wellhead pressure of 2,550 psi during its first week of production in December 2014. Management believes that this disparity is due to a combination of wellbore damage and some type of obstruction in the tubing string.
The casing pressures on WIN-13 have been varying between 1,700 – 1,800 psi. This indicates obstruction in the tubing since the friction losses normally expected at these production rates cannot account for this large a difference between the tubing and casing pressures at the wellhead.Prior to opening the well for testing, several days of bailing were required in order to reach and remove the plug set in the tubing before the drilling rig moved off. The material recovered during bailing operations was a combination of drilling mud, barite and lost circulation material, with small amounts of formation sand. Management believes that this same combination of material is resulting in significant wellbore damage and inhibiting reservoir inflow.
Serinus is currently preparing a work program using chemical solvents and coiled tubing to address these issues. The requisite equipment and materiel is available in country, and laboratory tests of the solvent on drilling mud samples from both WIN-13 and WIN-12bis have been very encouraging. Operations are expected to commence in mid to late May. In the interim, the well will remain on production to see if it will continue to clean up incrementally on its own.
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