High permeability allowed continuous flow rates from 13 feet of Clastic 31.
This work also confirmed historical pressure and temperature results for the closely spaced Long Canyon No 1 and White Cloud No 2 wells.
Anson’s Skyline Unit 1 and Long Canyon No 2 wells are on either side of the Long Canyon No 1 well.
Executive chairman and CEO Bruce Richardson said: “The flow rate from these wells and particularly the Skyline Unit 1 well are exceptionally high.
“It is the high pressure which brings the brine to surface as artesian flow, not requiring any energy input which, if it is maintained, will translate into a cost saving during commercial production.
“The higher than normal temperature at this depth is also important as it supports the 1960s theory that the brine reservoir is extensive as the heat may be brought to the brine in Clastic 31 as it has contact with brine from the reservoir below.”
These interpreted geophysical results indicate that flow rates and thickness of the flow may further increase with minor treatment of the wells.
Flow parameters determined from the downhole geophysical surveys and historical results.
Anson will use the down hole geophysical results, consisting of data points recorded every second during the surveys, in the estimation of a JORC-compliant resource.
Four re-entries of existing oil wells have been completed at the Paradox Brine Project to sample brines with all data collected to be used in the estimate, which is on track to be completed later this quarter.
Richardson said: “It should also be noted that the flow interval is 13 feet but this may be increased with a treatment to clean up the well and the perforations which could result in a greater flow interval and an increase in flow rate, further improving the economics of the project.
“Of particular significance is the correlation between the historical data and the data collected from Anson’s recent test work, which confirms the geological importance of Robert’s Rupture in providing an artesian flow of brine to surface.
“It should be noted that the lithium grade increases as the wells that Anson re-enters gets closer to the Long Canyon No 1 well where a lithium grade of 500ppm was recorded.”
The lithium-rich brines of Clastic Zone 31 and the brines of the Paradox Basin have been extensively studied since the 1950s.
Pressurised brines from this clastic zone consist of up to 30 feet of shale, anhydrite and dolomite, and are not part of any oil reservoir.
The brines are under higher than expected pressures and temperatures that would be expected at these depths.
This has resulted in the brines flowing to the surface when intersected by historical drilling.