But the improving effect and benefit of downhole operation have not formed yet.
但系统地提高井下作业效果与效益的管理思路尚未形成。
Formation burst pressure is one of the key parameters for the thermal production of heavy oil, drilling engineering and downhole operation.
地层破裂压力是钻井工程、井下作业及稠油油藏热力开采的重要参数。
Therefore, the calculation on the amount of deformation is not only an important work in force analysis of packer string, but also an important factor to ensure the downhole operation.
因此，计算自由移动封隔器管柱的变形量是整个管柱受力分析的重要组成部分，也是保证井下作业成败的关键因素。
Under the conditions of similar structure charging rate, higher pressure in the perforators can be produced in downhole operation by using combined perforation, failure would be caused in its joints.
在相同结构和装药量的条件下，复合射孔在井下作业能够产生较高的枪内压力，容易引起接头的剪切脱落失效。
The drilling jar which is connected with drill tool and worked with drill string is a downhole stuck freeing tool in drilling operation .
随钻震击器是连接在钻具中随钻柱一起进行钻井作业的井下解卡工具。
The structure and principle of operation of the stabilizer, and method for controlling borehole trajectory with the close_loop adjustable stabilizer at downhole are described in detail.
本文着重论述了井下闭 环可变径稳定器的结构、工作原理及其控制井眼轨迹的方法。
When coring barrel gets stuck downhole, it is very easy to back off safety joint to trip out inner barrel and cores, and only left outer barrel for fishing operation.
当岩心筒在井下被卡住时，很容易地从安全接头螺纹处倒开，起出内筒和岩心，只留下外筒进行打捞。
When coring barrel gets stuck downhole, it is very easy to back off safety joint to trip out inner barrel and cores, and only left outer barrel for fishing operation.
当岩心筒在井下被卡住时，很容易地从安全接头螺纹处倒开，起出内筒和岩心，只留下外筒进行打捞。
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