This company has developed together with the relevant scientific research organizations series filter products
for petroleum chemical filtration: Oil sand control screen (anti-sand filter blocks), spiral welded stainless
steel filter tube (spiral welded pipe), straight seam welded stainless steel filter tubes, well received by the
oil field customers.

Perforated seam is welded in straight line; with unique spiral distribution formed by spiral welding and
greater filter strength. When squeezed in some parts from external, under outside pressure, the forced
part will have reduced or closed gap and ensures the reliability of sand control. Made with sophisticated
technology, stainless steel filter glove has openings in the side with reduced direct corrosion to the perforated
welded sand pipe. Seam gap in the processing ranges between 20 mm-0.7mm. The uniform opening
ensuresthe processing difference is within the error scope allowed  0.015 mm, also ensures the accuracy
of its filter requirements. Using high precision perforating technology, the effective slotting length isthe three
to five times of common cut seam tube and two to three times of common perforated seam tubes.

2.center tube has unique spiral pattern
Center tube has high precision perforated tube with standard oil and glove tubes. The spiral perforating form
of the center tube reduces the opening area of the tube cross section and maintains the strength of the center
tube to the maximum. The sand is blocked outside of the perforated screen while the oil, gas or water goes
through the perforated opening then enters into the screen.

Center tube is API standard tube or oil tube and the high precision perforated filter glove is made of 304
stainless steel materials.For wells containing H2S, CO2, highCl that has special requirements, the center
tube can be corrosion-resistant casing or tubing. Screen is acid and alkali resistant and salt corrosion
resistant