Transerv Commences Testing Ops at Warro-5, Warro-6 Wells in WA
Transerv Energy announced Tuesday that Warro-6 onshore well in Western Australia is flowing gas naturally while Warro-5 continues to clean up with the aid of a jet pump.
Following the completion of the maintenance work last week, testing operations of both wells resumed on Feb. 19.
At Warro-6, during the shut-in period, the wellhead pressure (WHP) built to 2,700 pounds per square inch (psi) and as a result the decision was taken to remove the jet pump and allow the well to flow naturally. Flowing a first flush of gas at rates over 4 million cubic feet per day (MMcf/d) in the first 24 hours, the gas rate stabilized at 0.73 MMcf/d and has since been steadily increasing to the present rate of 0.85 MMcf/d. Importantly, accompanying water rates are decreasing (presently averaging 425 barrels of water per day or bwpd down from 600 bwpd at the beginning of the stabilized natural flow period) while flowing WHP has remained constant at 325 psi.
At Warro-5, gas rates have average 0.75 MMcf/d over the last 24 hours (up from average last week of 0.6 MMcf/d) while liquid rates continue to decrease. The performance of Warro-5 is very similar to Warro-6, suggesting that it too will be capable of natural flow in the near future.
During the fracture stimulation work, organic tracers were added to the fluids. These tracers tag both the gas and liquids flowing from each stimulation stage and hence estimate the relative contribution from each stage.
For Warro-5, the tracers indicate that over 70 percent of the liquids and 54 percent of the gas have come from Stage 2. This suggests that Stage 1 is potentially still cleaning up.
For Warro-6, Stage 2 is dominating both gas and liquid flows yielding 54 percent of the liquids and 70 percent of the gas. Stage 3 is only contributing 8 percent of the gas.
“While it is still very early days in this testing program, these well results are encouraging. The fact that sustainable natural flow has been established at Warro-6, and indications that Warro-5 will follow soon, show the wells are capable of producing significant quantities of gas unaided. The trends are in the right direction.“
“The tracer information suggests we are not seeing the true potential of all zones and we can hope that as testing proceeds, stages 1 and 3 in Warro 6 will contribute more gas. From a geological viewpoint, Stage 2 in Warro-5 is equivalent to Stage 3 in Warro 6 underlining that Stage 3 in Warro-6 has more potential.”
“As previously indicated, the stimulation work carried out at Warro-5 and 6 only targeted approximately 50 percent of the net pay identified in each well, signifying the current program is not evaluating the full potential of the reservoir section.”
The current well testing program is being funded by Alcoa as part of the Warro project farm-in arrangement. The program has been planned to run for 3 - 6 months.
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