The primary application for this type of screen would be in unconsolidated formations where a gravel pack is economically undesirable, and its successful completion is in question. Variperm Pre-Packed Screens consist of an inner and outer wire wrapped screen packed with high quality smooth well rounded silica sand.

Pre-Packed Screens are available in many different sizes. Any of our Pipe Size or Telescope Screens can be used together to provide you with the best assembly that meets your requirements.

We have readily available the following Pack Sand US Mesh Sizes;

Description, US Mesh Size	Gravel Size, Inches		Gravel Size, mm
20-40 Gravel Pack Sand	0.017	0.033	0.43	0.84
16-30 Gravel Pack Sand	0.023	0.047	0.59	1.19
12-20 Gravel Pack Sand	0.033	0.066	0.84	1.68
10-16 Gravel Pack Sand	0.047	0.079	1.19	2.01
8-12 Gravel Pack Sand	0.066	0.094	1.68	2.39
6-9 Gravel Pack Sand	0.085	0.132	2.16	3.35

Pre-Packed Screens have relatively high porosity which combined with their very high permeabilities provide minimal pressure drops. In order to properly size the pack sand, and screen slot, a sieve analysis is completed on a true sand sample obtained from the well in question.

Learn more about Variperm's Water Well Screen Solutions by selecting from these options: