Welding equipment of the sand prevention tube

Abstract

The invention discloses a welding device for sand prevention pipe, which adopts the double-face single spot welding or sew welding art to fix a metal weave net outside a support sheath, therefore, the divulging hole phenomenon of the metal net is eliminated. Because the sand prevention pipe with multilayer metal weave nets is made up, the sand prevention capability and the life-span of the sand prevention pipe are improved. Furthermore, the welding device of the sand prevention pipe achieves penetrating type welding for slender filtering sheath, thereby improving the welding quality of the metal weave net and reducing the making cost of the sand prevention pipe.

Description

[0001] This application is a divisional application of an application whose filing date is October 25, 2004, whose application number is 200410084147.X, and whose invention title is "Manufacturing Method and Welding Equipment for Sand Control Pipe". technical field [0002] The invention relates to welding equipment for sand control pipes (or called screen pipes), in particular to a welding equipment for manufacturing sand control pipes made of filter materials such as metal braided nets by resistance spot welding or seam welding, and belongs to the technical field of petroleum exploitation. Background technique [0003] In the field of oil and gas exploitation, in order to prevent formation sand in oil and gas wells from being brought into the wellbore or ground equipment along with oil, gas and water, it is necessary to use downhole sand control pipes that can effectively filter oil, gas and water. On the downhole sand control pipe section that is tens to hundreds of meters...

AI Technical Summary

Problems solved by technology

However, conventional welding techniques either have low welding strength, or there are leakage holes (shrinkage cavity phenomenon) in the welded part of the metal mesh.

Therefore, when a single-layer metal braided mesh is used as the filter material of the sand control pipe, welding holes are prone to appear in the place of arc welding; therefore, mechanical fixing methods (such as folding, pressing, etc.) It is fixed on the base pipe of the sand control pipe, however, the strength and reliability of the sand control pipe manufactured by this method are relatively low

[0006] Although non-sintered multi-layer composite mesh can be used to manufacture sand control pipes, the shrinkage phenomenon of multi-layer composite mesh is more serious than that of single-layer mesh during welding

At the same time, due to the large thickness of the sand control pipe, the filter section is several meters long, which also brings a series of difficulties to welding, resulting in welding high-quality, low-cost sand control pipes by welding methods and using metal mesh has always been a major problem in the industry. problem

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