基于声波处理技术的钻井环空动液面监测方法

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Hao Weiwei，Wang Ying，Zhang Siyuan，etal.Monitoring method for working fluid level in driling annulus based on acoustic processing technology [J]. China Petroleum Machinery，2O25，53（5）：18-29.

关键词：环空动液面；声波处理技术；SVMD；动液面监测；声波信号处理；AMDF中图分类号：TE28 文献标识码：A DOI：10.12473/CPM.202405029

Monitoring Method for Working Fluid Level in Drilling Annulus Based on Acoustic Processing Technology

Hao Weiwei1Wang Ying1Zhang Siyuan²Wang Min³ Wang Wei1Li Mu1Xu Baochang² （1.CNPCEngineerin TclogyR&DmanyLimied；2llgeofArtifcal Intellience，naUniestyfeo（Beijing）；3.OiladGasReseroirGeologyInstituteofKelaOilandGasProductionManagementArea，PetroChinaTarimOifeldCompany）

Abstract：The monitoring of working fluid level in the annulus is of great significance for judging the abnormal working conditions in the welbore.However，due to complex downhole environment，the conventional acoustic methodcannot ensure areal-time and accurate monitoring.In this paper，the echo characteristics were combined with the acoustic processing technology to achieve thereal-time monitoring of working fluid level in the annulus.First，successive variational mode decomposition （SVMD）was used to filter the downhole echo signals. Second，the Holtling T2 test method was used to detect the position of fluid level echo，and then the combined algorithm of short-time autocorrelation function （ACF）and average amplitude diference function （AMDF）was used to detectthe average period of collar echoes.Finally，the downhole acoustic transit timeand average acoustic velocity were determined to achieveareal-time monitoring of the working fluid level in the anulus.The test results show that the proposed methodcan efectively identifythe fluid level echoes at different depths，and canachieve a realtime measurement while ensuring a relative error of less than 0.8% ， meeting the requirements for data of working fluid level in the annulus during driling.This study has a practical significance for monitoring downhole accidents.

Keywords： working fluid level in the annulus； acoustic processing technology；SVMD；working fluid level monitoring； acoustic signal processing； AMDF

0引言

钻井是油气勘探开发过程中的重要环节，随着钻井深度的增加，井控安全要求逐渐严格[1]。（剩余16380字）