井口声发射井筒液气浸检测—时延估计方法

doi:10.3863/j.issn.1000-2634.2000.03.008

西南石油大学学报(自然科学版) ›› 2000, Vol. 22 ›› Issue (3): 29-33.DOI: 10.3863/j.issn.1000-2634.2000.03.008

井口声发射井筒液气浸检测—时延估计方法

唐斌熊英

(电子科技大学电子工程系,四川成都610054)

收稿日期:1999-12-20 修回日期:1900-01-01 出版日期:2000-08-20 发布日期:2000-08-20
通讯作者: 唐斌

WELLHEAD ACOUSTIC EMISSIVE GAS INFLUX DETEC-TION: TIME DELAY ESTIMATION METHODS

Tang Bin Xiong Ying　

(University of Electronic and Science Technolo-gy of China Chengdu)

Received:1999-12-20 Revised:1900-01-01 Online:2000-08-20 Published:2000-08-20
Contact: TangBin

摘要/Abstract

摘要： 基于高阶统计,提出了井口声发射井筒液气浸检测中的接收和发射声信号之间时延估计的非参数化和参数化方法。通过分析声信号在井筒液中的传播过程,井口声发射井筒液气浸检测中的接收噪声,可近似模型化为空间相关的高斯色噪声。由于四阶累积量对任意高斯噪声的盲目性,因此,较常规互相关估计方法,这些方法可以进一步提高检测概率。计算机模拟结果证实了它们的有效性。

关键词: 井筒液, 气浸, 时延估计, 高阶统计

Abstract:

Based on high order statistics, the non-parametric and parametric methods, which estimate the time delay between the receiving and emissive signal, are presented in wellhead acoustic emissive gas influx detection. By analyzing the signal propaga-tion process, it is seen that the noises, received by two pressure sensors can be modeled as spatially correlated Gaussian noise ap-
proximately. The fourth order cumulant is blind to arbitrary Gaussian noise, so these methods may significantly increase gas influx detection probability compared to the conventional cross-correlation method. Computer simulation confirms their availability.

Key words: wellhole fluid, gas influx, time delay estima-tion, high order statistic

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