research and development of high-pressure filter elements for pe well

a strong pull brought one bucket to the top while the other down to the water ．

用力一拉，一只桶就会被提到井口，另一只则会落入井水里。

中考真题- 2017 安徽 任务型阅读

analysis on ansys in shell masonry structure of single arched pithead

地下圆拱式单井口砌体薄壳结构的有限元分析

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the rate for an urgent call is twice that of an ordinary call. but the supplementary charge is not doubled.

加急电话的资费是普通电话的两倍，但是附加费不加倍。

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first we present graph theory model to problem 1, and conclude that the most wells we can use are four old ones, while using the rectangle diagonal method to problem 2, the number comes to six.

利用矩形对角线法对问题2得出最多可利用6口旧井，井号为1、6、7、8、9、11。

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the spherical magnetic mineral grains within sample 6 from b well-1 are authigenic magnetite which formed under geochemical conditions of hydrocarbon migration.

BI井6号样品中发现的典型球状磁性矿物是在烃聚集的地球化学环境中形成的自生磁铁矿。

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linking to a specific section is possible, too. just add the section name behind a hash character as known from html. this links to this section.

链接到一个特殊的区块也是可以的。仅仅在井号之后加上这个区块的名字。这个链接指向这个区块。

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kondo is not part of a breed of alpha-organizers bent on dominating the world, despite her hashtag.

尽管有那样的井号标签，但近藤并不是那种一心主导世界的顶级组织者。

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weighted sharp functions and their applications

加权井号函数及其应用

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formation fluid properties include: the sampled well name;

地层流体性质包括：取样井号；

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a more typical solution is to display the username, hostname, directory, and the dollar or hash sign, depending on the uid of the current user.

更典型的解决方案是显示用户名、主机名、目录，以及美元符号或井号（具体取决于当前用户的UID）。

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it finishes measure management, accident management, well survey management, press survey management, inspection cost management, data and report-forms disposal of well number management. these are demanded by the system.

完成了系统要求的措施管理、事故管理、测井管理、测压管理、监测费用管理、井号管理数据处理和报表处理。

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by using powerbuilder 7, inquiry through a clue of combination of conditions including structural tree, strati graphic tree, well number tree and sample number tree is realized, which meets the thinking way of geologists.

以构造树、地层树、井号树、样品编号树为数据导航线索，利用PowerBuilder7数据库开发工具，设计了符合地质人员思维观念和使用习惯的树状组合条件查询。

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the results show that the temperature rise of fluid co2 is little because of insulation measures like insulated tubing and n2 in casing annular and the temperature of co2 arriving bottom hole has larger difference as different injection rate.

计算结果表明，由于注入时间较短，且注入过程中采取使用隔热油管、环空内充氮气等保温措施，液态CO2温升较小；随着注入速度的变化，液态CO2到达井底的温度相差较大。

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using mohr coulomb criteria, the sand production model is founded. the calculating method of the critical fluid pressure of bottom hole is given.

根据Mohr-Coulomb准则，建立了相应的出砂预测模型，给出油井出砂时临界井底流压的计算方法。

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according to bond crack theory, this paper sets forth a new rock drillability testing method which takes the detritus from the bottom hole as the research subject. a correlation model of drillability grades and cuttings fractal dimensions is established.

依据Bond裂纹学说，提出了一种以井底返出的岩屑为对象的岩石可钻性测试方法，并建立了岩石可钻性极值和岩屑分形维数的关系模型。

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by studying the shape of bottomhole pattern, the paper has mainly made an approach to the bottomhole pattern characteristics, presented a group of characteristic parameters, and obtained the close relation between these parameters and the type of rock bit by fuzzy cluster.

通过对井底模式形状的研究，对井底模式特征进行了探讨，提出了一组特征量，并用Fuzzy聚类方法分析得出特征量和钻头结构密切相关。

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the flow field of pdc bits is very complicated during drilling process, while optimizing its hydraulics parameters is an effective method to improve its drilling performance.

PDC钻头在实钻过程中井底流场非常复杂，而优化其水力学参数是提高钻头钻井能力的有效手段。

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the overall characteristics of flow field are analyzed and various influences of nozzle diameter on the downhole flow field of pdc bits are obtained.

分析了流场的总体特点，得出了喷嘴孔径对PDC钻头井底流场的各种影响。

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the mechanics mechanism of heightening rop is studied through comparing the stress field of two-stage pdc bit with that of regular pdc bit.

对比双级PDC钻头和常规PDC钻头的井底应力场，研究了其提高机械钻速的力学机理。

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and the jet flow field of 4 nozzles of a pdc bit is tested by simulating the bottomhole flow field of the bit.

在模拟PDC钻头井底流场的条件下，对PDC钻头4个喷嘴的射流流场进行了测试。

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