They have now contracted the services of an international firm to review all aspects of reservoir development and expects this evaluation to be completed by early 2003.
Executive vice-president Bruce Vincent said Swift Energy NZ had been having continuing problems with production levels and was convinced that the Tariki sands had been damaged in some way. The rock properties indicated flow rates should be better than they actually were. Swift did not know if the type of drilling fluids used or the "fraccing" techniques used were the likely causes, but believed that the Tariki sandstones had been damaged during the past months.
Five months ago oil production from the Rimu production station, in PMP 38151, was about 1270 barrels of oil per day and gas production up to 2.8 million standard cubic feet per day (mmscf). Now net production during the third quarter of 2002 had averaged only 572 barrels of oil and condensate and 1.8 mmscf of natural gas per day. This is solely from the Tariki sands.
Swift Energy also said that preliminary testing of the Kauri A-4 exploratory well was encouraging, although more work was required before a final appraisal could be made. The well flowed natural gas and condensate at average rates of 2.1 mmscf/d and 76 barrels of condensate per day from three distinct intervals in the upper portion of the shallow Kauri sand. Average flowing tube pressure was 326 psi over the 119-hour production test. The well was shut-in to evaluate the pressure buildup and for the evaluation of flow data obtained.
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