1·The rule of reservoir pressure distribution and bottom hole flowing pressure alteration of a periodic trial-produce well in infinity subterranean formation.
无限大地层中—口间歇试采生产井的地层压力分布及井底流压变化规律；
2·Darcy's law indicates that formation pressure of an oil well has some correlativity with wellbore fluid producing volume and bottom hole flowing pressure.
达西定律表明，油井地层压力与井筒产液量和井底流压具有相关性。
3·The result shows that the main reasons are high bottom hole temperature, corrosion of drilling tool during storage and drilling process, high value of formation drillability, and multi-fault.
结果表明，井底温度高、钻具存放及钻井过程中的腐蚀和地层可钻性级值高且断层多，是该地区钻具失效的主要原因。
4·Under the conditions of constant pressure boundary, when the time approaches to infinity, the curve between the flow rate and the bottom hole pressure is so called conventional IPR curve.
对于定压边界，当时间趋向于无穷大时，气井产量与井底压力关系曲线即是我们常用的IPR曲线（不妨称为常规IPR曲线或稳定IPR曲线）。
5·The quantitative relationship between the motion and force of cone bits has not been established up to now owing to the complexity of the work of the bits in bottom hole.
由于牙轮钻头在井底工作的复杂性，目前还没有从理论上建立牙轮钻头的定量运动与受力关系。