During a geothermal well campaign, there was a requirement to drill a 6” section beneath a 9-5/8” x 7” tapered liner and enlarge it to 8-1/2” on a subsequent reamer run, maximizing access to the geothermal reserve.
Four DAV MX™ CircSubs were activated sequentially a total amount of four times across two separate runs.
During the first, 6” section drillout run, the 5” (NC38) DAV MX™ sub, positioned in the BHA, was used to flush the cuttings post drilling to above the 7” OD (NC50) sub - spaced out across the top of the 9-5/8” x 7” liner.
The 7” sub was then activated to lift the cuttings to surface before cycling it back to closed position and POOH. The exact same sequence of operations was carried out during the subsequent 6” x 8-1/2” hole enlargement run. All four tools performed as expected providing the operator with most optimal hole cleaning application on a challenging geothermal well.
