超高強(qiáng)度抗擠套管的開發(fā)
Development of Extra-high-strength Anti-collapse Casing
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摘要: 中原油田東濮凹陷地區(qū)發(fā)育相當(dāng)成熟的巖層要求套管單軸抗擠強(qiáng)度不低于103MPa,以抵御惡劣的地質(zhì)條件。為了能和上下管柱設(shè)計(jì)使用的API標(biāo)準(zhǔn)規(guī)格的Φ177.8mm×10.36mm以及Φ177.8mm×11.51mm套管方便地連接,設(shè)計(jì)了非API標(biāo)準(zhǔn)規(guī)格的Φ180mm×11.51mm套管。采用純凈鋼技術(shù)制造了這種規(guī)格的BG160TT超高強(qiáng)度抗擠套管。試制結(jié)果表明:該套管屈服強(qiáng)度不低于1210MPa,沖擊功不小于110J,抗擠強(qiáng)度不低于110MPa。該超高強(qiáng)度抗擠套管已在中原油田東濮凹陷地區(qū)成功下井使用。Abstract: The salt bed stratum in Dongpu depression area of Zhongyuan Oilfield is developed so well that it is required that the uniaxial collapse strength of the casing must be no less than 103 MPa so as to cope with the severe geological conditions. A non-API Φ180 mm×11.51 mm casing is designed for easy connection with the API Φ177.8 mm×10.36 mm and Φ177.8 mm×11.51 mm casings as designed and used in both the upper and lower casing strings. Then the BG160TT extra-high-strength anti-collapse casing of the said non-API size is produced by means of the clean steel manufacturing technology. The preparation result shows that the said casing features such characteristics as yield strength ≥1 210 MPa,impact energy≥110 J,and collapse strength ≥110 MPa. Such extra-high-strength anticollapse casings have been successfully used in the well of Dongpu depression area of Zhongyuan Oilfield.
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