Annular Seal Articles & Analysis
6 articles found
Sealing this pipe-through so that no substance-gas or liquid-leaks is of utmost concern. ...
Excessive high-rate pumping of monitoring wells can lead to damage of the well filter pack and annular seal. ...
Bangladesh is underlain by shallow aquifers in which millions of drinking water wells are emplaced without annular seals. Fecal contamination has been widely detected in private tubewells. To evaluate the impact of well construction on microbial water quality 35 private tubewells (11 with intact cement platforms, 19 without) and 17 monitoring wells (11 with the ...
• If possible, remove well fixtures including casing, annular seal, filter pack and sampling mechanism before closing the well. ...
With a multilevel well, it is important to accurately record the depth of the bentonite/sand seal and gravel pack in the annular space. In our case, such measurements were obtained using a plumb bob suspended on a wire cable to 'tag' the top of the seal and gravel pack. ...
The general construction of a C-Spargeô consists of a 100 mm casing leading to a 1.5 meter screen with 0.5 meter above the water table, a blank casing which was bentonite-sealed in the annular space to prevent short-circuiting, and a lower 1.5 meter screen (10 slot). ...