新型固井冲洗液评价装置适用性分析

发布时间：2018-03-04 13:41

本文选题：固井　切入点：冲洗液　出处：《石油钻探技术》2017年01期 　论文类型：期刊论文

【摘要】：为了明确新型固井冲洗液评价装置的适用范围,根据评价装置内筒外壁面处与固井环空壁面剪切速率相等的原理,结合罗伯逊-斯蒂夫流变模式推导了冲洗液为牛顿、宾汉和幂律流体时其在内筒外壁处剪切速率的计算公式,并分析了不同流变模式冲洗液内筒外壁面处剪切速率与固井环空壁面剪切速率的误差。分析结果为:当冲洗液为牛顿流体时,评价装置在内筒外壁面处的剪切速率与固井界面处相等,不存在理论误差;当冲洗液为宾汉和幂律流体时,评价装置内筒外壁面处的剪切速率大于固井界面处,且剪切速率增量与内外筒间隙和冲洗液流变性质有关;当评价装置外内筒半径比限定在1.04~1.20时,冲洗液为幂律流体且流性指数大于0.6或为宾汉流体且动塑比小于1Pa/(mPa·s)时,剪切速率相对误差在10%以内。研究结果表明,评价装置外内筒半径比越小,相对误差越小,其适用范围越大。
[Abstract]:In order to clarify the applicable range of the new cementing flushing fluid evaluation device, according to the principle that the shear rate is equal between the outer wall of the inner cylinder and the hollow wall of the cementing ring, the washing fluid is Newton based on the Robertson Steve rheological model. The formula for calculating shear rate of Bingham and power law fluid at the outer wall of the inner cylinder, The error between the shear rate at the inner wall of the flushing fluid with different rheological models and the shear rate at the wall of the cementing annulus is analyzed. The results are as follows: when the flushing fluid is Newtonian fluid, The shear rate at the outer wall of the inner cylinder is equal to that at the cementing interface, and there is no theoretical error, and when the flushing fluid is Bingham and power-law fluid, the shear rate at the outer wall of the inner cylinder is larger than that at the cementing interface. The shear rate increment is related to the inner and outer cylinder clearance and the rheological properties of the flushing fluid, when the radius ratio of the inner tube outside the device is limited to 1.04-1.20, the flushing fluid is a power-law fluid with a flowability index greater than 0.6 or a Bingham fluid with a dynamic plastic ratio of less than 1 Pa / MPA 路s. The relative error of shear rate is less than 10%. The results show that the smaller the radius ratio, the smaller the relative error and the wider the range of application.
【作者单位】：中国石油渤海钻探工程有限公司井下技术服务分公司;西南石油大学石油与天然气工程学院;
【分类号】：TE256

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