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引言用堵塞比(DR)和截面堵塞比[seetional damagl ratio(SDR)]两个系数评价地层损害,以初始渗透率作参考。剩余渗透率以相对值的形式表示,通过分成5cm长一段的几段园柱形岩心渗透率的测定,来确定渗透率损害的深度,(图1),为表示这个指标引入截面堵塞比(SDR)的术语。这里叙述的方法用来评价由氯化钾/白垩泥浆引起的两种砂岩的损害,这两种砂岩的渗透率是10和100md,考查了压力差、温度、环空速度和损害时间等引起的变化。由钻
INTRODUCTION Two factors, the ratio of blockage (DR) and seepage damage ratio (SDR), are used to assess formation damage, taking initial permeability as reference. The residual permeability is expressed in terms of relative values. The depth of permeability damage is determined by the determination of the permeability of several sections of cylindrical core separated by a length of 5 cm (Figure 1). To indicate the index incorporates the section blockage ratio (SDR) the term. The method described here is used to evaluate the damage of two types of sandstone caused by potassium chloride / chalk mud. The permeability of both sandstones is 10 and 100 md. The effects of pressure difference, temperature, annulus velocity and damage time Variety. By the drill