摘要
套管外表面泥膜厚度及其分布规律是影响固井一界面胶结质量的一个重要因素,而对于不同井斜角下套管外表面的泥膜厚度分布规律及其对界面胶结强度的影响,则迄今尚未见到相关文献报道。为此,通过自主设计的实验装置测定了井斜角分别为0°、30°、60°、86°条件下模拟套管(钢管)外表面不同部位的泥膜厚度,进而分析总结了泥膜厚度在管外的分布规律及其对界面胶结强度的影响情况。研究结果表明:①当井斜角从0°增大到86°时,泥膜厚度从均匀分布递变为薄厚相间分布,泥膜偏薄区域和泥膜偏厚区域面积占比均变大,尤其是在井斜角为86°时,上表面泥膜厚度很大,并且钢管左、右表面有大片裸露区;②裸套管组的一界面胶结强度远大于带泥膜组界面胶结强度,并且随着井斜角的增大,带泥膜组界面胶结强度趋于增大;③随着井斜角的增大,界面胶结强度依次增大与钢管裸露区在其外表面实泥膜中的面积占比密切相关。结论认为,模拟套管外表面裸露区域面积的大小是影响其界面胶结强度的关键因素。
The mud film thickness on the outer surface of casing and its distribution laws are important factors affecting the cementation quality at casing-cement interfaces.So far,however,the distribution laws of mud film thickness on the outer surface of casing at different inclinations and its effect on the interfacial cementing strength have never been reported in literatures.In this paper,the mud film thickness at different parts on the outer surface of simulated casing(steel pipe)was measured at the inclination of 0°,30°,60°and 86°,respectively,using the independently designed experimental device.Then,the distribution law of mud film thickness on the outer surface of casing and its effect on the interfacial cementing strength were summarized.And the following research results were obtained.First,when the inclination increases from 0°to 86°,the mud film thickness changes from uniform distribution to thin-and-thick distribution,and the area proportions of thinner and thicker mud films both increase.And especially at the inclination of 86°,the mud film thickness on the upper surface is very large,and there are large exposed areas on the left and right surfaces of the steel pipe.Second,the cementing strength at the casing-cement interface of the exposed casing is much higher than that at the interface with mud film.And with the increase of inclination,the cementing strength at the interface with mud film tends to increase.Third,with the increase of inclination,the interfacial cementing strength increases successively,which is closely related to the area proportion of the exposed steel pipe to the solid mud film on the outer surface.In conclusion,the exposed area of the simulated casing on the outer surface is a key factor affecting its interfacial cementing strength.
作者
顾军
李士超
田亚芳
李刚
赵鑫鑫
李林蔚
唐雨
Gu Jun;Li Shichao;Tian Yafang;Li Gang;Zhao Xinxin;Li Linwei;Tang Yu(Faculty of Earth Resources,China University of Geosciences,Wuhan,Hubei 430074,China;Cementing Company,Sinopec Zhongyuan Petroleum Engineering Co.,Ltd.,Puyang,Henan 457001,China;No.1 Gas Production Plant,PetroChina Qinghai Oilfield Company,Golmud,Qinghai 816099,China)
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2019年第8期88-95,共8页
Natural Gas Industry
基金
国家科技重大专项子课题（编号：2017ZX05009003-003）
国家自然科学基金项目（编号：51774258、41572142）
关键词
固井一界面
井斜角
泥膜厚度
分布规律
胶结强度
套管外表面裸露区域
Casing-cement interface
Inclination
Mud film thickness
Distribution law
Cementing strength
Exposed outer surface of casing
