套管中泄漏弯曲型Lamb波的传播特征
发布时间：2018-12-10 14:20
【摘要】：低阻抗水泥固井质量检测是油气田生产亟需解决的问题。套管中传播的最低阶泄漏弯曲型Lamb波(以下简称为A0弯曲型Lamb波)对套管后介质尤其是低阻抗水泥的声学参数和胶结状况具有很高的敏感性。通过建立多层介质模型,从理论上计算了其频散和衰减与套管后介质属性及水泥环第Ⅰ界面胶结状况的关系,并数值模拟了有限尺寸定向辐射探头激发和接收的全波波形。结果表明,在套管后耦合慢速水泥时,A0弯曲型Lamb波的频散曲线存在断点,曲线分为两个分支;A0弯曲型Lamb波的衰减在套管后耦合慢速水泥时最大并且对水泥环第Ⅰ界面胶结差时流体环厚度有很高的灵敏度,利用其衰减可以实现对套管后介质类型、水泥环第Ⅰ界面胶结状况及窜槽厚度的有效判别。
[Abstract]:Low impedance cement cementing quality detection is an urgent problem to be solved in oil and gas field production. The lowest order leaky bent Lamb wave (hereinafter referred to as A0 bending Lamb wave) propagated in casing has a high sensitivity to acoustic parameters and cementation of the medium behind casing, especially low impedance cement. By establishing a multilayer dielectric model, the relationship between dispersion and attenuation, the properties of the medium behind the casing and the cementation condition of the first interface of the cement ring is calculated theoretically. The full wave waves excited and received by the finite size directional radiation probe are numerically simulated. The results show that there are breakpoints in the dispersion curve of the A0 bending Lamb wave and the curve is divided into two branches when the casing is coupled with slow cement at the back of the casing. The attenuation of the A0 bending Lamb wave is maximum when the casing is coupled with slow cement and has a high sensitivity to the thickness of the fluid loop when the cement ring is not cemented at the first interface. The attenuation of the A0 wave can be used to realize the media type behind the casing. The cementation condition of the first interface of cement ring and the effective judgement of the thickness of channeling groove.
【作者单位】： 中国石油大学(华东)地球科学与技术学院;
【基金】：国家自然科学基金(40804020) 山东省自然科学基金(ZR2011DQ020) 中央高校基本科研业务费专项资金(14CX05010A)资助
【分类号】：O347.4
本文编号：2370725
[Abstract]:Low impedance cement cementing quality detection is an urgent problem to be solved in oil and gas field production. The lowest order leaky bent Lamb wave (hereinafter referred to as A0 bending Lamb wave) propagated in casing has a high sensitivity to acoustic parameters and cementation of the medium behind casing, especially low impedance cement. By establishing a multilayer dielectric model, the relationship between dispersion and attenuation, the properties of the medium behind the casing and the cementation condition of the first interface of the cement ring is calculated theoretically. The full wave waves excited and received by the finite size directional radiation probe are numerically simulated. The results show that there are breakpoints in the dispersion curve of the A0 bending Lamb wave and the curve is divided into two branches when the casing is coupled with slow cement at the back of the casing. The attenuation of the A0 bending Lamb wave is maximum when the casing is coupled with slow cement and has a high sensitivity to the thickness of the fluid loop when the cement ring is not cemented at the first interface. The attenuation of the A0 wave can be used to realize the media type behind the casing. The cementation condition of the first interface of cement ring and the effective judgement of the thickness of channeling groove.
【作者单位】： 中国石油大学(华东)地球科学与技术学院;
【基金】：国家自然科学基金(40804020) 山东省自然科学基金(ZR2011DQ020) 中央高校基本科研业务费专项资金(14CX05010A)资助
【分类号】：O347.4
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