若想提高小间隙井的固井质量,需要扩眼增大环空间隙.基于环空水力摩阻当量密度,提出了小间隙环空摩阻压降当量密度法、管内外推力相等法和声幅测井法等3种小间隙固井扩眼尺寸确定法,并综合3种方法给出了小间隙固井扩眼值的推荐范围.所得结果认为,为保证φ139.7、φ127.0和φ114.3 mm套管固井质量,所需扩眼尺寸分别为176.7 ～187.5、164.5 ～ 174.8和151.6 ～ 162.1 mm.该研究成果应用于塔河油田S119-1CH井φ127.0 mm尾管固井中,在井下5 561.45 ～5 976.00 m固井质量优质.%The annular gap should be increased through reaming in order to improve the cementing quality of small-gap wells.On the basis of annular hydraulic friction equivalent density,the three methods to determine the small-gap reaming size were formulated,including the equivalent density method of small-gap annular friction pressure differential,internal and external tube thrust equivalence method and acoustic amplitude logging method.The recommended scope of small-gap cementing reaming value was given through a comprehensive consideration of the three methods.The findings show that to ensure the cementing quality of the φ139.7,φ127.0 and φ114.3 mm casings,the reaming dimensions required are 176.7 ～ 187.5,164.5 ～ 174.8 and 151.6 ～ 162.1 mm.The research achievement was applied to the φ127.0 mm liner cementing in Well S119-1CH in Tahe Oilfield.The cementing quality was very good within the downhole depth of 5 561.45 ～ 5 976.00 m.
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