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

1、

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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2、

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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3、

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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4、

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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5、

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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6、

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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7、

bottom pressure calculation method of surpressure gas well and how to correct the pseudo-critical parameters of natural gas with high content of h_2s and co_2 are presented in this paper.

本文介绍超高压气井井底压力的计算方法，以及如何对高含H2S和CO2天然气的视临界参数进行必要的校正。

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8、

designed target area is horizontal displacement 600 ± 150m, orientation 350 °± 20 °.

设计靶区为井底水平位移600±150m、闭合方位350°±20°。

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9、

based on the solution in laplace space, the skin factor and storage coefficient are considered in solving the equations conveniently.

在以上Laplace空间解式的基础上，方便地求解出考虑表皮系数和井筒存储系数影响的井底压力。

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10、

an ipr equation of a production well describes the relationship between production rate and the bottom hole pressure.

油井的流入动态（IPR）曲线是描述油井产量和井底流压关系的曲线。

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11、

transient ipr curves are a set of curves between flow rate and bottom hole pressure under different time.

不稳定IPR曲线是指不同的时间下井底压力与流量的关系曲线。

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12、

the pressure and its derivative are also given for one fault, channel, u-shaped and rectangular reservoir by using the superposition theory.

利用叠加原理给出地层中有单一断层或供给边线，以及河道状油藏，U形油藏，矩形油藏等井底压力及其导数的双对数图。

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13、

the study of the pdc anti-whirling

PDC钻头在井底的涡动分析研究

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14、

ipr equation in a unsaturated reservoir was established from vogel equation.

基于Vogel方程，建立了未饱和油藏的IPR方程，并对测点井底流动压力高于或低于饱和压力的两种情形，分别提出了应用一点法确定油井IPR曲线，预测油井产能变化的方法。

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15、

laplace space solution of the bottom hole pressure in double-porosity composite confined reservoir

双孔复合封闭储层中井底压力的Laplace空间解

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16、

experimental study on the characteristics of fluid distribution at bottomhole of pdc bits

PDC钻头井底液流分布特性的实验研究

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17、

analysis of bottom-hole stress field of two-stage pdc bit

双级PDC钻头井底应力场分析

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18、

design of the experimental instrument for pdc bit downhole flow field testing

PDC钻头井底流场实验装置设计

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19、

numerical simulation study on bottom hole flow field of pdc coring bits

PDC取心钻头井底流场的数值模拟研究

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20、

it is the first that the application of plc to the loading system for the bottom of main shaft in our mine.

PLC在我国矿主井底装载系统中的应用还属首次。

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