Ellingson-DTD installed four single-ended (blind) coal ash dewatering wells within a closed ash basin. The wells were constructed utilizing the Knock Off (KO) well completion technology. In this drilling/installation method, we used drillable casing to advance a pre-planned bore path to an underground termination point. Upon reaching the end of the bore, the crew pushed the well material down through the center of the casing. When the well material reached the end, it latched onto and pushed the sacrificial drill bit off the drill string. The drillable casing was then tripped out of the bore, leaving the well in place. This method allows us to install long single-ended wells in unconsolidated ash that may not allow an open-bore installation approach.
| Completion Date | Well ID | Materials | Screen Length | Riser Length | Total Length |
| 4-16-24 | GSA-01 | 4’’, Sch. 80 PVC | 1,000’ | 416’ | 1,416’ |
| 5-8-24 | GSA-02 | 4”, 304 Stainless | 2,240’ | 420’ | 2,660’ |
| 5-23-24 | DSA-02 | 4” Sch. 80 PVC | 1,230’ | 520’ | 1,750’ |
| 6-24-2024 | DAS-01 | 4” Sch. 80 PVC | 1210’ | 560’ | 1,770’ |
Biodegradable drilling fluid was used for drilling and well installation. Well development consisted of flushing and jetting with an enzyme breaker solution and overpumping with a submersible pump. The average pumped volume from the wells during development activities is 12,700 gallons. Post development pumping, a camera survey was performed, and then Ellingson crews installed permanent submersible pumping systems in each well.
