水平井扇区水泥胶结测井偏心校正技术

Eccentricity Correction Technique for Sector Cement Bond Logging in Horizontal Well

水平井固井质量评价资料为压裂等储层增产改造方案的制定提供支持,在水平井段,扇区水泥胶结测井仪器重力作用存在向下偏心现象,导致测井响应值偏低、解释偏差大。针对这一问题,研究偏心模型下井孔声场分布,明确了偏心距与套管波幅度间的关系;分析测井声系空间排布特点,利用八扇区到时、幅度反演仪器偏心程度;形成了适用于扇区水泥胶结测井的水平井固井质量评价偏心校正技术。该技术在南272-平××井等81口水平井中应用,测井解释结果的准确性得到提高。

Well cementing quality evaluation data of the horizontal well is to provide support for the development of reservoir stimulation plan .In horizontal well section ,there is downward eccentricity due to the gravity effect of the sector cement bond logging instrument ,w hich leads to the low response value and large deviation of interpretation .To solve this problem ,the acoustic field distribution in the borehole is studied ,and the relationship between the eccentricity and the casing wave amplitude is defined .Inversed is the instrument eccentricity by the signal time and amplitude from the eight receivers on the basis of the acoustic spatial characteristics analysis .An eccentric correction technique is developed for the evaluation of the horizontal well cementing quality of the sector cement bond log ,which is applied to 81 wells including N272‐P × × ,and the accuracy of well logging interpretation is improved .