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这口井的钻具结构是什么？Whet is the BHA of this well.

接大钻具是我们来日诰日的作事。大型钻井机。To pick up BHA is our work tomorrow.

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通过抗氧化性比较，表明黄酮提取液的抗氧化性优于BHT和BHA。It was show that the antioxidant ability of flavonoids extraction is better than BHT and BHA.

结果表明，该提取物的活性略强于人工合成抗氧化剂BHA。The results show that the extracts have stronger antioxidative activity than BHA in the system.

黄油、肉类、谷类、口香糖、焙烤食品、休闲食品、脱水土豆和啤酒中都能找到它的身影。BHA is found in butter, meats, cereals, chewing gum, baked goods, snack foods, dehydrated potatoes, and beer.

钻具组合上有扶正器可使套管鞋反向定位以减少套管内钻具组合的侧向移动。A stabilizer on the BHA positioned opposite the casing shoe reduces lateral motion of the assembly inside the casing.

采用了MWD无线随钻仪器，倒装钻具组合，优化了钻井参数，实现了精确中靶。MWD tools were used, and by using of reversed BHA and optimizing of drilling parameters, precise target hitting was achieved.

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用量子化学计算结果阐明其捕收能力比水杨醛肟强的原因。The cause of BHA having stronger collecting properites than salicylaldoxime is explained by quantum chemistry calculation data.

结果表明，较好地设计钻具组合的结构，可以得到令人满意的导向力。The results show that by designing the structure of the slide-steering BHA carefully, an appropriate steering force can be gained.

为随钻扩眼钻具组合的优化设计和施工提供了科学的理论依据。These researching achievements offer some scientific theories foundations for the RWD BHA optimization designs and it's construction.

对BHA以上井段，用微单元力平衡分析法具体分析钻柱的受力，给出不同工况下水平井摩阻力计算的简化条件。The beam-column theory was applied to calculate the torque and drag in BHA section, and the mini-element analysis was used in uper BHA section.

当起钻到BHA，扶正器到达钻盘面时，司钻必须刹住刹把，让钻工移开方补心。While pulling the BHA through the rotary table, the Driller must stop when stabilisers reach the table and have the Floormen remove the bushings.

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在深井和硬地层钻井中，地质构造复杂、地层倾角大、地层研磨性强，机械钻速低、钻具失效严重，钻柱设计是其中的制约因素之一。In the process of drilling deep well and hard formations, the drill string design is one of the factors restricting low ROP and serious BHA failure.

文中介绍了利用柴油机尾气钻井中气量确定、必要的装备、井下钻具组合和尾气钻井工艺措施等。Using diesel tail gas drilling, the determination of airshed, necessary equipment, downhole BHA and drilling technology measures etc. are presented in this paper.

该程序可以在普通微机上运行，能迅速模拟计算底部钻具组合任一点的挠度、转角和内力，同时求得钻头对地层的机械作用力和偏转角。The BHA an alvsisprogram thus developed can be run on a micro-computer to compute rapidly BHA deflections , tilt an-gles and internal forces including the bit behavior.

文中给出了钻压和转速对预弯曲动力学防斜打快钻具组合防斜力的影响规律。Also, it is described the influence of bit pressure and rotate speed on anti-deviation force of the BHA of anti-deviation and fast penetration with pre-bending dynamics.

介绍了小口径孔底动力钻具组合造斜的影响因素及预测方法，确定了BHA自重作用下临界钻压及临界长度，并对钻具的力学特性进行了分析。The method that resolved the critical drilling pressure and critical length has been pointed out under its weight and the mechanics characteristics of BHA have been analyzed.

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采用组合钻具进行跟管钻进，通过随钻跟入的套管保护孔壁，解决因钻孔垮塌导致钻探效率和岩心采取率低等技术难题。The problems of low drilling efficiency and low core recovery due to borehole collapse were solved with pulling in casing while drilling through using combined BHA with casing.

通过试验研究及力学分析，采用有限元法、间隙元法建立大庆油田小眼井下部钻具双重非线性力学分析模型和理论分析方法。This paper describes how to use finite element and clearance element methods to establish slim hole BHA dual nonlinear mechanics analysis model and theoretical analysis method.

利用该模式并结合钻柱力学三维分析，可以预测定向井井眼轨迹，还可以利用定向井井史资料，反求有关系数。Combined with the BHA analysis , the models are used to realize the prediction of drilling trajectory and to back-calculate the related coefficients from the well history information.