深井和頁巖氣開發(fā)用超高強(qiáng)度高韌性套管的研制
R & D of Ultra-high Strength/Toughness Casing for Deep Well and Shale Gas Drilling Service
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摘要: 通過研究合金化、微合金化技術(shù)和優(yōu)化制造工藝，開發(fā)出具有優(yōu)異沖擊韌性的BG140V/BG155V超高強(qiáng)度高韌性套管，屈服強(qiáng)度達(dá)到1 000 MPa以上且0℃橫向夏比沖擊功超過名義屈服強(qiáng)度的10%以上，滿足了深井油氣和頁巖氣資源開發(fā)對(duì)套管高強(qiáng)度和高韌性的要求。采用光學(xué)顯微鏡、掃描電鏡、電子探針以及電子背散射衍射等分析手段，分析了BG140V/BG155V超高強(qiáng)度高韌性套管的微觀組織，發(fā)現(xiàn)成分偏析的改善、細(xì)小的析出相和晶粒是韌性提高的主要原因。Abstract: The BG140V/BG155V ultra-high strength/toughness casing is developed by means of studying the alloying and micro-alloying technologies，and optimizing the manufacturing process.The casing is in possession of excellent Charpy impact toughness and yield strength up to 1 000 MPa，and transverse Charpy impact value at 0℃surpassing the nominal yield strength by 10%，having been satisfactory to the requirements for the hi-strength/ toughness casing as serving the deep oil/gas well and shale gas drilling.The microstructure of the BG140V/BG155V ultra-high strength/toughness casing is characterized by means of optical microscopy（OM），scanning electron microscopy（SEM），electron probe microanalysis（EPMA）and electron backscattered diffraction（EBSD），etc.As a result，it is identified that the main elements responsible for the toughness enhancement of the casing are the improvement of chemical segregation，and refined precipitates and grains.
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