关键词: 小井眼, 固井, 顶替, 效率, 速度, 分布

Abstract: By using the mathematical and physical methods,this paper presents the derivation of annular liquid laminar flow equation group in the process of slimhole cementing displacement.According to the conformal transformation and numerical difference,the distribution of flow field and annular liquid laminar velocity field is gained; the computer-calculating program is successfully made. Using this software, the optimal parameters, such as slimhole annular structure, n, k value of slurry and slimhole eccentricity,are derived.Based on similarity theory,two sets of experimental simulating devices are manufactured.Through experiments of slimhole washing and displacement,we conclude the results of slimhole displacement efficiency influenced by factors,such as annular conditions,slurry performance,mud performance and static time and so on.The methods and approaches of improving slimhole cementing displacement efficiency are finally suggested.

Key words: slimhole, cementing, displacement, efficiency, velocity, distribution