| 1 | 用先进的超声波脉冲回波技术进行厚壁套管外的水泥评价:接近极限显示文摘随着全球钻井条件更为复杂和极端,经过专业设计的井及其设备不再罕见而已成为常态。政府增加监督,强调保证井的完整性以及安全操作同样影响了资产发展。因此需要重新设计干预工具应对这些挑战。超声脉冲回波技术已成功应用于0.75英寸厚的套管外水泥评价多年。然而,传统的超声波无法产生合适的信号电平和穿透常用的深水井完井厚套管。但先进的超声波技术可以解决这个问题。腔室测试后进行各种换能器材料和激发技术的初步研究以验证在一定范围内的水泥浆和套管尺寸的数据质量和重复率。实验室结果表明,套管外水泥阻抗可达1.2英寸厚。该新服务的应用特别适合高成本、高风险资产的区域(超深水墨西哥湾,西非以及巴西近海等),在这些区域油井完整性保证和减少干预的时间和成本极为重要。 | Foianini B.Mandal R.Epstein 舒中强 | 2014 | 国外测井技术2014，，1： | 0 |
| 2 | Measurements of the ablation-front trajectory and low-mode nonuniformity in direct-drive implosions using x-ray self-emission shadowgraphy显示文摘Self-emission x-ray shadowgraphy provides a method to measure the ablation-front trajectory and low-mode nonuniformity of a target imploded by directly illuminating a fusion capsule with laser beams. The technique uses time-resolved images of soft x-rays(>1 ke V) emitted from the coronal plasma of the target imaged onto an x-ray framing camera to determine the position of the ablation front. Methods used to accurately measure the ablation-front radius(δ R= ±1.15 μm), image-to-image timing(δ( t)= ±2.5 ps) and absolute timing(δt= ±10 ps) are presented.Angular averaging of the images provides an average radius measurement of δ( Rav)= ±0.15 μm and an error in velocity of δV / V= ±3%. This technique was applied on the Omega Laser Facility [Boehly et al., Opt. Commun. 133, 495(1997)] and the National Ignition Facility [Campbell and Hogan, Plasma Phys. Control. Fusion 41, B39(1999)]. | D.T.Michel A.K.Davis W.Armstrong R.Bahr R.Epstein V.N.Goncharov M.Hohenberger I.V.Igumenshchev R.Jungquist D.D.Meyerhofer P.B.Radha T.C.Sangster C.Sorce D.H.Froula | 2015 | High Power Laser Science and Engineering2015，3，3： | 0 |
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