Abstract: The present invention relates to a method for manufacturing a screen and welding apparatus thereof, putting a metal filter net around the outside of a support sheath and fixing the metal filter net to the outside of the support sheath by way of welding, such that the metal filter net completely covers all filter holes of the support sheath to form a filter sheath with; fixing the filter sheath to the outside of the base pipe and the filter sheath completely covering all penetrated holes on the base pipe; putting a jacket around the outside of the filter sheath and fixing it to the outside of the base pipe such that the jacket completely covers the outside surface of the filter area of the filter sheath.

Abstract: The present invention relates to a method for manufacturing a screen and welding apparatus thereof, putting a metal filter net around the outside of a support sheath and fixing the metal filter net to the outside of the support sheath by way of welding, such that the metal filter net completely covers all filter holes of the support sheath to form a filter sheath with; fixing the filter sheath to the outside of the base pipe and the filter sheath completely covering all penetrated holes on the base pipe; putting a jacket around the outside of the filter sheath and fixing it to the outside of the base pipe such that the jacket completely covers the outside surface of the filter area of the filter sheath.

Abstract: The present invention relates to a method for manufacturing a screen and welding apparatus thereof, putting a metal filter net around the outside of a support sheath and fixing the metal filter net to the outside of the support sheath by way of welding, such that the metal filter net completely covers all filter holes of the support sheath to form a filter sheath with; fixing the filter sheath to the outside of the base pipe and the filter sheath completely covering all penetrated holes on the base pipe; putting a jacket around the outside of the filter sheath and fixing it to the outside of the base pipe such that the jacket completely covers the outside surface of the filter area of the filter sheath.

Abstract: The present invention discloses a filtering mesh for an oil well, a sand control sleeve and a sand control screen pipe using the filtering mesh. The filtering mesh at least comprises a bottom diffusion mesh (20) and one or more twill weave meshes (21) fixed on the bottom diffusion mesh (20); one or more twill weave meshes (21) are applied in filtrating solid particulates in a stratum fluid, and the bottom diffusion mesh (20) is applied in diffusing the filtrated fluid. The bottom diffusion mesh (20) is a woven mesh or a punching steel plate mesh with 5-50 meshes; the aperture of the twill weave mesh (21) is 40-400 micron. The present invention also relates to a sand control sleeve formed of the filtering mesh, a tubular inner protective shroud (19) and a supporting ring (15). This invention further relates to a sand control screen pipe formed of the filtering mesh, a multi-holes base pipe (1), a tubular inner protective shroud (19), an outer protective shroud (3) and a supporting ring (15).