【作者】 曲建芳；

【导师】 艾池；

【作者基本信息】 东北石油大学 ， 油气井工程， 2011， 硕士

【摘要】 固井作业是油气井建井中的重要环节,油气井固井质量的好坏直接影响油气田开发水平,固井质量评价则是正确使用油井和采取措施保护油井的关键前提。现在我国绝大部分油田利用声波测井技术评价固井质量,声波测井技术在固井质量评价中发挥了巨大的作用。随着对固井质量检测技术的深入研究,发现利用声波信号评价固井质量时,会受到一些因素的干扰,有时测井曲线的检测结果不一定能真实反映出固井质量好坏,无法保证固井质量绝对合格可靠。本文在研究测井曲线评价固井质量时,充分考虑了干扰因素对声波传播的影响。本文通过对声波传播路径进行分析,开展声波在介质中的传播机理研究,针对声波测井问题,建立各界面分层介质模型,对声波传播各界面声波强度进行了计算,推导出分层界面中的声波相对强度表达式,分析介质的声阻抗对声波相对强度的影响,得出介质声阻抗对声波能量影响的定量关系,说明声波测井曲线在评价固井质量时要进行声阻抗修正,经过对现场资料的调研验证了该研究的正确性,本文的研究有利于保证固井质量评价的准确性。更多还原

【Abstract】 Cementing operation is an important link to oil-gas well construction, cementing quality is the direct influence factor of development of oil-gas field, and cementing quality evaluation is the key precondition of using and protecting well correctly. Now acoustic logging technology is wildly used to evaluate cementing quality in most of oilfields in our country, and acoustic logging technology has been played a crucial role in cementing quality evaluation.With in-depth research of cementing quality detecting technology, it is found that some interferes are existed in using acoustic signal to evaluate cementing quality, so in sometimes the test result from logging curve are not consistent with the real cementing quality, and cementing quality would not be guaranteed absolutely perfect. In this paper, the effect of influence factors on acoustic propagation is adequately considered when cementing quality evaluated with logging curve is studied.In this paper, through analyzing the acoustic propagation path, mechanism of acoustic propagation in layered medium is researched, model of layered medium in different interface is established to the question of acoustic logging, acoustic intensity that propagated to each interface is calculated, expression of relative acoustic intensity in each interface is deduced, and effect of acoustic impedances of layered medium on relative acoustic intensity is analyzed, so quantification relation of effect of acoustic impedances of layered medium on acoustic energy is obtained. Therefore, acoustic impedances amendment is needed when using acoustic logging curve to evaluate cementing quality, and validity guarantee for the veracity of cementing quality evaluation.更多还原