Different Depth Research Expandable Screen Base Pipe Material

The article introduces the constitution of expansion screen pipe, expand craft, and selection of materials. Followed by it, the author selects three materials as inflation sieve tube base tubes to do the experiment. It includes metallographic analysis, mechanical property analysis, Fracture morphology analysis and fem analysis.According to experimental study, at room temperature conditions the ductility of 15CrMo steel,316L stainless steel and 21Cr5Mn24A12Si steel, all meet demand for preparation of inflation sieve tube base tube, but in different well temperature conditions show different results. The mechanical property of three inflation sieve tube base tubes was influenced by well temperature in different extent. The Rm,Reh and A of 15CrMo steel has different influence by temperature, as the temperature increases, the Rm and Reh have a tiny increases, and the A has a larger amplitude drop; the Rm,Reh and A of 316L stainless steel and 21Cr5Mn24Al2Si steel are severely influenced, as the temperature increases, the Rm,Reh and A have a larger amplitude drop. In finite element analysis, equivalent stress distribution of 15CrMo steel and 21Cr5Mn24A12Si steel, and 316L stainless steel are the same after different expansibility, the maximums of them are totally the same and are distributed around kerf spiry; for the 15CrMo steel, temperature and expansibility have a tiny influence on performance, while, for 21Cr5Mn24A12Si steel and 316L stainless steel, expansibility also has a tiny influence on performance, temperature is on the opposite side; calculated results of fem analysis is 90.08% of the results in laboratory, therefore, it's reliable and can be used in site operation.Finally, according to experiment and fem analysis,15CrMo steel,316L stainless steel and 21Cr5Mn24A12Si steel can preparation expansion screen base pipe, but their application different well depth and well conditions.15CrMo steel is a kind of heat-resistant pearlite steel, it can resist 550℃, but it cannot resist corrosion, so can only applicable to lighter corrosion wells.316L stainless steel is a kind of austenitic stainless steel, the corrosion resistance performance is better, but by the influence of the temperature of the intensity bigger, so can applicable to the not complex wells and the well depth in 1,000 to 2,000 meters. 21Cr5Mn24A12Si steel has good mechanical performance, not only strength and elongation is higher, but also has good corrosion resistance, so it can be used to the complex well,deep well and ultra deep well.