In the original conditions, reservoir rocks and fluids inside the pore space in the pressure equilibrium, once the oil drilling, this balance was destroyed.
在原始条件下，油层岩石与孔隙空间内的流体处于压力平衡状态，一旦钻开油层，这种平衡就被破坏。
Although balance drilling is paid more attention to, Yitong exploration area in Jilin is still put overbalance drilling first for its unique and complex geological conditions.
虽然平衡钻井越来越受到勘探工作的重视，但吉林伊通探区因独特而复杂的地质条件，仍以过平衡钻井为主。
So in such a formation construction, it is important to use the technology of drilling mud back to tank to balance the pressure of the loose layer and prevent the borehole collapse.
所以在这种地层中施工，利用泥浆回灌钻孔技术有效地平衡松散层压力不使其垮塌尤为重要。
By using drilling, milling, grinding, file and other means to remove the quality; Can also change in slot on the balance of the precast counterweight position and quantity.
用钻、铣、磨、锉等手段来去除质量；还可以在预制的平衡槽内改罭变平衡块的位置和数量。
In the process of balance pressure drilling in fractured carbonate formation, fluid loss is possible when the hole penetrates the fracture.
碳酸盐裂缝性地层，在平衡钻进过程中，一旦钻遇裂缝，就可能发生井漏。
The principle of reaching balance drilling and under balanced drilling using foam mud in water well drilling in Karst formation was presented.
分析了岩溶地层水文水井施工中，泡沫实现平衡压力或欠平衡压力钻井的原理及影响泡沫钻井有效井眼压力的因素。
Using under balance pressure drilling technique aims at preventing the mud loss and pollution of Palaeozoic limestone reservoir in this area and therefore protecting oil reservoir.
该井四开钻探过程中成功地采用欠平衡钻井技术钻穿寒武系凤阳山组，以防止该区古生界灰岩储层发生井漏及储层污染，从而保护油层。
The main points and difficult points in the drilling machining of balance tube for screw panel in the drilling and the method of solving these problems are introduced in this article.
超临界锅炉水冷壁螺旋管屏的平衡管管孔加工难点和要点，以及解决的工艺措施。
The main points and difficult points in the drilling machining of balance tube for screw panel in the drilling and the method of solving these problems are introduced in this article.
超临界锅炉水冷壁螺旋管屏的平衡管管孔加工难点和要点，以及解决的工艺措施。
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