Because the complexity of the geology, the exploitation faces many series difficulties including: incomplete hole pattern, difficulty in adjustment, fast increasing of water ratio, low degree of pressure level maintaining, large scope of natural degression.
由于油藏地质条件复杂，目前油田开发面临着局部井网不完善、调整难度大、含水上升速度加快、压力保持水平整体偏低、自然递减大等严峻的开发形势。
参考来源 - 宝浪油田宝北低渗透油藏水淹层识别及水淹规律研究·2,447,543篇论文数据，部分数据来源于NoteExpress
N a decrease by stages 递减
Majority enterprises scale disposition is unreasonable, which is in the condition of scale benefit degression.
大部分的企业规模配置不合理，处于规模效益递减状况；
The result shows that axial stress of Pile takes on degression along with deepness and the effective length of Pile is influenced by replacement-ratio.
结果表明桩身轴向应力随深度增加呈递减趋势； 粉喷桩复合地基的有效桩长受桩土模量比与置换率的影响。
The degression rule of the administrative efficiency of organizational systems, namely entropy effect, is a universal subject with important research value.
组织系统管理效率递减规律，即熵值效应，是一个具有普遍意义并且具有重要研究价值的课题。
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