Study on Flushing Efficiency of Drilling Fluid Filter Cake in Oval Wellbore
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摘要: 目前固井工程中钻井液滤饼冲洗效率的研究多针对于圆形井眼套管居中条件下的冲洗情况，而针对井眼形状和套管偏心等因素对钻井液滤饼冲洗效率影响的研究较少。使用钻井液滤饼冲洗模拟实验装置测试了椭圆井眼中偏心度和冲洗流量对钻井液滤饼冲洗效率的影响，并基于计算流体力学(CFD)方法分析了冲洗液在环空中的流场，计算了冲洗液的水力剪切力，阐明了滤饼冲洗效率变化的机理。研究结果表明：椭圆井眼环空中的短轴方向偏心时，钻井液滤饼冲洗效率在环空长轴方向最大，宽短轴方向次之，窄短轴方向最小；增加环空短轴偏心度，钻井液滤饼冲洗效率在长轴方向略微减小，宽短轴方向增加，窄短轴方向大幅降低；增加环空冲洗流量，环空中钻井液滤饼总体冲洗效率明显增加，但环空中长轴方向滤饼冲洗效率的增幅最大，宽短轴次之，窄短轴最小。Abstract: At present, the research on the flushing efficiency of drilling fluid filter cake in cementing engineering mainly focuses on the flushing condition of the circular hole casing in the middle, while the research on the influence of the hole shape and casing eccentricity on the flushing efficiency of drilling fluid filter cake is less. This study uses the drilling fluid filter cake flushing simulation experimental device to test the influence of eccentricity and flushing flow rate in the elliptical hole on the drilling fluid filter cake flushing efficiency, and analyzes the flow field of the flushing fluid in the annulus based on the computational fluid dynamics (CFD) method, calculates the hydraulic shear force of the flushing fluid, and clarifies the mechanism of the change of the filter cake flushing efficiency. The results show that when the short axis direction in the annulus of the elliptical hole is eccentric, the flushing efficiency of the drilling fluid filter cake is the largest in the long axis direction of the annulus, followed by the wide and short axis direction, and the narrow and short axis direction is the smallest; By increasing the eccentricity of the short axis in the annulus, the flushing efficiency of the drilling fluid filter cake decreases slightly in the long axis direction, increases in the wide and short axis direction, and decreases significantly in the narrow and short axis direction; With the increase of annulus flushing flow, the overall flushing efficiency of annulus drilling fluid filter cake is significantly increased, but the increase of filter cake flushing efficiency in the long axis direction of the annulus is the largest, followed by the wide and short axis, and the narrow and short axis is the smallest.
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Key words:
- Oval wellbore /
- Filter cake /
- Flushing fluid /
- Eccentricity /
- Flushing flow rate /
- Flushing efficiency
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表 1 椭圆井眼滤饼冲洗实验方案
滤饼压制 t冲洗间隔/
minK
pa·snn 冲洗流量/
L·s−1偏心度（e） P/MPa t/min 1.5 30 5 2.119 0.516 0.31 0 0.61 0.2 0.92 0.4 1.22 0.6 1.53 
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