The company intends to drill up to five stratigraphic wells by the end of March 31, 2020, to further define the field's geothermal reservoir parameters. The first of the new wells, Border-02A, was completed in December. Drilled from the same surface location as DEEP's first well, Border-01, directionally to the southwest with a bottom hole located 1,500m from Border-01, it was drilled to a depth of 3,834m measured hole depth, (3,490m true vertical depth from surface).
DEEP's third well, Border-02B has been drilled to a depth of 3,898m measured hole depth, (3,632m true vertical depth from surface) on January 19, 2020. It was drilled from the same well bore as Border-02A as a whipstock that enabled the acquisition of additional data between Border-01 and Border-02A at a reduced cost compared to drilling a separate well from surface.
Border-02B exceeded the record depth of Border-01 by an additional 102m true vertical depth, giving title to this new well as the deepest ever drilled in Saskatchewan.
Border-03, 04 and 05 will be achieved with two drilling rigs in order to complete the programme prior to Spring road bans.
This winter drilling programme will increase the confidence in the geological model and test the recently acquired 3D seismic data. It will also test regional airborne magnetic data geological interpretation. The multi-well programme will achieve flow testing and injection testing to optimise the locations and design of full-sized production wells planned to be drilled later in 2020 and 2021.
The wells from this winter programme will also have significant value in monitoring the reservoir response during and after large scale drilling development required for full geothermal field development.
In August 2019, DEEP completed a flow and pressure build-up test on Border-01 to assess reservoir pressure and well deliverability. The pressure data affirmed the existence of fracture flow contributions often sought after in geothermal projects. The stimulated maximum production rate for this well supports the potential for an economically viable project.
Following the flow and build-up test, a series of injectivity and fall-off tests were conducted. These tests further affirmed that a significant portion of the fluid contribution produced from the well is sourced from a fractured reservoir system. Upon completion of these tests, the remaining brine in the tank farm was disposed into the well which accepted the fluids at high rates, limited only to the capacity of the injection pump. This test confirmed the reservoir's capability to flow in both directions - to produce as well as accept injected fluids.
The results of the winter drilling and testing programme will provide detailed data required for the final subsurface and facility design required for full construction. The reservoir data will be incorporated into a full-scale simulation model to design the full production wells, optimal well spacing and full-field development. This data will also be implemented to optimise the final surface power facility design.
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