Oil sand tube, spinning tube 

 From the base tube, multi-storey sand filtration kits, and the outer protective sleeve is composed from the inside out. High quality stainless steel for the four multi-storey sand filter; from the inside out is divided into: draft tube (0.5 mm precision CNC punching board), precision microporous filters 20 * 110 head, microporous filters 40 head, precision microporous filters 20 * 110 mesh, red seam outside the protective sleeve by a precision CNC punching gap slit width in the range of 0.5 ~ 1.00mm sand filtration kits and stainless steel red seam outside the protective sleeve and pipe welding as a whole. With high permeability, high corrosion resistance characteristics and resistance to deformation, the formation sand blocked in the filter-slit protective sleeve in order to strengthen the protection of filter sets. Formation fluid through the slit gap into the sieve to achieve the purpose of sand. 

 Features: 
 A multi-storey sand filter sand and efficient performance, better able to block the formation sand to meet the underground sand. 
 2, the filter pore is uniform, high-performance permeability and blockades. 
 3, large filtration area, flow resistance is small, the oil rate 
 4, excellent corrosion resistance of stainless steel, acid, alkali, salt corrosion, can be adapted to the special requirements of the wells, crevice corrosion and will not become bigger. 
 5, the multilayer structure welding one can filter hole stability, resistance to deformation is very strong. 

 Protective cover can also be spiral welded 
 Material may need to produce stainless steel of 304,316316 L, multi-storey sand filtration kits, and the outer protective sleeve according to the user's underground.