水泥密度和套管尺寸对油井套管波的影响  

The effects of cement density and casing dimension on casing waves in oil wells

作　　者：陈德华[1] 王秀明[1] 张海澜[1] 王东[1] 魏涛 刘力平 

机构地区：[1]中国科学院声学研究所 [2]中海油服股份有限公司测井中心,燕郊101149

出　　处：《声学学报》2008年第1期15-20,共6页Acta Acustica

基　　金：国家自然科学基金重点项目(10534040);黑龙江省自然科学基金项目(A2004-3)

摘　　要：通过数值模拟结合实验测量,研究了第一、第二界面胶结良好情况下套管井内的声场,考察了水泥密度、套管直径及其壁厚对套管波幅度的影响,并将部分数值模拟结果与实验结果进行了对比。结果表明,套管波幅度随固井水泥密度增大而减小,低密度水泥和常规密度水泥固井时所得到的套管波幅度相差较大;因此,进行固井质量评价时对不同密度的水泥应采用不同的评价标准。当套管直径不变而壁厚增大时,套管波到时不变而幅度增大;当套管壁厚不变而直径增大时,套管波到时延后而其绝对幅度减小。对油田中常用的三种套管,在大型号套管中所得到的套管波的相对幅度也较大。另外,数值结果中套管波相对幅度随水泥密度的变化规律与实验测量结果基本一致。The acoustic field in a cased hole is studied through numerical modeling by combining experiment measurement when the first and second interfaces are bonded well. The effects of the density of the cement, the diameter and thickness of the steel pipe on the amplitude of the casing arrival （ACA） are investigated, and a part of the numerical results are compared with the experimental results. The results show that the ACA decreases with the increasing density of the cement. There exists a large difference between the ACAs for the low- and normal-density cements. Therefore, the different standard should be taken in the bonding evaluation for cements with different density. As the thickness of the casing increases while it＇s diameter keeps as a constant, the arrival time of the casing wave remains unvaried while the ACA increases. But when the diameter of the casing with a constant thickness increases, the arrival time of the casing wave is delayed and the ACA decreases. As for the three kinds of the steel pipe commonly used in oilfields, the relative amplitude of the casing arrival is larger in the big pipes. In addition, the numerical results of the varying trend of the relative amplitude of the casing arrival with the density of cements, on the whole, are in agreement with the experimental results.

关 键 词：低密度水泥 固井水泥 套管波 油井 尺寸 实验测量 固井质量评价 数值模拟 

分 类 号：TE256[石油与天然气工程—油气井工程]