graceful degression工作可靠但性能下降
decrement degression渐减
density degression变密度
monotonous degression单调递减
Discrepancy Degression差异递减
variety degression品种退化
degression n递减
degression descending递减
oilfield degression regularity油田递减规律
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N（名词） a decrease by stages 递减