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    高鋼級(jí)套管韌性指標(biāo)適用性計(jì)算方法研究(下)

    Research on Calculation Method for Toughness Target Suitability of High Steel Grade Oil Casing（PartⅡ）

    • 摘要: 利用CEGB-R6安全評價(jià)方法,基于材料真應(yīng)力-應(yīng)變行為建立了高鋼級(jí)套管失效評估曲線,對高鋼級(jí)套管材料的斷裂韌性KI與常溫沖擊功AKV的關(guān)系進(jìn)行了統(tǒng)計(jì)研究,根據(jù)失效評估技術(shù)獲得了含缺陷套管韌性指標(biāo)的適用性計(jì)算方法。通過人工預(yù)制裂紋、有限元數(shù)值模擬和內(nèi)壓爆破全尺寸實(shí)驗(yàn),對韌性指標(biāo)計(jì)算方法進(jìn)行了有效驗(yàn)證。將所得的計(jì)算結(jié)果與API Spec 5CT標(biāo)準(zhǔn)規(guī)定的韌性指標(biāo)進(jìn)行分類對比,指出API標(biāo)準(zhǔn)的韌性計(jì)算方法是以防止脆性啟裂為設(shè)計(jì)依據(jù)的,由于僅考慮了屈服強(qiáng)度和套管壁厚,而對套管外徑、服役中產(chǎn)生的缺陷幾何形貌等因素缺乏考慮,因此在實(shí)際服役中存在較大的安全隱患。

       

      Abstract: Based on the true stress-strain behavior of the material and with the CEGB-R6 safety assessment method,the failure assessment characteristic of the high steel grade oil casing is created with which the fracture toughness KI vs the ambient temperature impact value AKV relationship is studied in an statistical way.And the calculation method for toughness target suitability of defective oil casing is obtained with the failure assessment technique.The calculation method is verified by using such processes as artificial crack,FE numerical simulation and internal-pressure explosion full dimensional experiment.The calculation result is categorically compared with the toughness values as specified in API Spec 5CT.Accordingly,the conclusion is made that the API-specified toughness calculation method is based on the design purpose of preventing occurrence of brittle crack,and only the yield strength and the casing wall thickness are taken into account,while factors concerning the casing such O.D.and the defective geometry as developed during the service are out of the consideration,and thus some considerable potential hazard would exist during actual service of the casing.

       

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