传统的治疗方法是以环钻法为主的髓心减压技术。
Traditional scheme is core decompression technique using trephine.
方法利用体外培养的单层近融合期人RPE细胞，采用棉签和角膜移植用环钻做圆形细胞刮伤区，建立体外RPE细胞损伤模型。
Methods Cultured monolayer-confluent human RPE cells were scraped with a trephine and a cotton stick, and set up the injured model of RPE cells with round scraped area.
结论在穿透性角膜移植术中应用非接触性、无热效应的准分子激光制作植床，可提高环钻质量，减少移植片表面的不规则性，使手术效果得到改善。
Conclusion Noncontact and nonthermal excimer laser penetrating keratoplasty can promote the quality of trephination, reduce the irregularity of grafts, and improve the effects of the operation.
机械卡钻可能由井眼内的碎屑、井眼内几何形状异常、水泥、键槽或者岩屑在环空中的积聚等引起。
Mechanical sticking can be caused by junk in the hole, wellbore geometry anomalies, cement, keyseats or a buildup of cuttings in the annulus.
举例分析在环空和钻柱内的稳定流动过程中，随井深增加，压力、含气率、多相流体密度等的变化规律；
The steady-state flows in drill pipe and in annulus are analyzed and the variations of pressure, gas void fraction, and multiphase-flow density along the well depth are simulated.
扩孔加大了环空间隙，固井后水泥环厚度和强度增大，可以延长侧钻小井眼油井寿命。
The annular clearance was also enlarged, thus the thickness and strength of the cement sheath was increased, and the oil well life of the sidetracked slim hole was also prolonged.
就位接头与止动环用螺纹联结并上紧扣和钻柱连接下入井内，在未投入止回阀时作为钻柱上的一个接头。
The landing is thread connected with stop ring and tightened on and put into downhole with drill string. The landing sub is used as a sub above drill string before check valve is run in downhole.
其次，在气体钻水平井中，井筒环空流动为气—固两相流。
Secondly, in the horizontal gas Wells, wellbore annulus flow of gas - solid two-phase flow.
其次，在气体钻水平井中，井筒环空流动为气—固两相流。
Secondly, in the horizontal gas Wells, wellbore annulus flow of gas - solid two-phase flow.
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