volume bled back

For the influen- cing factors of drilling time,drilling fluid inlet flow rate when the hydrocarbon reservoirs are drilled into,the total hydrocarbon detecting values will be different for the same reservoir conditions,and even the difference is great.

气测录井随钻检测的全烃值是发现和评价油气层的重要参数,但由于钻开油气层时受钻时、入口钻井液流量等因素的影响,相同储集层条件下其全烃检测值有所不同,甚至相差较大。

Applying finite element method,the dynamic characteristics of drill string with cone bit in straight hole were simulated,and the whirl,deformation and the dynamic stress in air drilling were compared with the ones in drilling fluid drilling.

应用有限元方法,仿真了空气钻井时斜直井眼中带牙轮钻头钻柱的动力学特性,比较了空气钻井和钻井液钻井条件下钻柱的涡动、变形以及动态应力状况,探讨了空气钻井钻柱失效的动力学机理。