Ansila Energy NL (ASX:ANA) has successfully completed the casing integrity test of the Siciny-2 (Gora) well in Poland prior to preparations for the hydraulic fracture stimulation and well test scheduled this month.
Well integrity testing
Following mobilisation of the Coiled Tubing Unit (CTU) on November 25, 2019 and pressure testing of the Blow Out Preventer (BOP), the Siciny-2 well was re-entered and cleaned up via the circulation of a cleaning solution.
On completion of the clean-up process, the shut-in wellhead pressure (WHP) increased from 5 bar to 28 bar indicating effective pressure communication between the well and the reservoir.
On removal of the CTU, perforation guns were run into the well on November 28, 2019 and the casing was perforated at 3,413 to 3,414 metres and re-perforated at 3,272 to 3,273 metres.
Halliburton Wireline Services were then mobilised to the well site to perform a well integrity test to assess the condition of the casing and cement in the Siciny-2 borehole.
The logging was successfully completed on December 2, 2019.
Casing and cement in good condition
The result of this has demonstrated that both the well casing and the cement were of sufficient integrity for the reservoir stimulation to be performed through the casing without the need for a through-tubing operation.
Ansila technical director Chris Lewis said: “The results from the well integrity wireline logs, showing that both the casing and cement are in good condition, improves our confidence in executing a successful frac of the Carboniferous gas bearing reservoirs early next week, and further de-risks the operations at the well site.”
Operational timeline highlighting the remaining well site operations at Siciny-2 targeting a 2C contingent resources of 1.6 trillion cubic feet
Preparations are now underway for a two-stage reservoir stimulation of the perforated Carboniferous reservoir section to be performed followed by the pumping of a ceramic proppant to maintain the fracture system prior to placing the well on flow test.
The Halliburton frac fleet is now being mobilised to the well site, along with the Weatherford well testing equipment, in preparation for the upcoming operations.
Prior to the flow test, downhole pressure gauges will be set after which a brief isochronal well test will be conducted followed by a longer flowing period and a long-term transient pressure build-up test to gather reservoir data over an extended period.
The pressure build-up data, together with the flow rate data, will confirm the potential commerciality of the Siciny-2 well.