海上钻井平台井喷液柱高度的图像识别测量方法  

A method for measuring the heights of blowout liquid columns on an offshore drilling platform based on image recognition

作　　者：孙晓峰[1] 姚笛 刘书杰 任美鹏 耿亚楠 Sun Xiaofeng;Yao Di;Liu Shujie;Ren Meipeng;Geng Yanan(School of Petroleum Engineering,Northeast Petroleum University,Daqing,Heilongjiang 163318,China;CNOOC Research Institute,Beijing 100028,China)

机构地区：[1]东北石油大学石油工程学院 [2]中海油研究总院

出　　处：《天然气工业》2019年第9期96-101,共6页Natural Gas Industry

基　　金：国家重点研发计划项目“海洋石油天然气开采事故防控技术研究及工程示范”(编号:2017YFC0804500);中海石油(中国)有限公司科技项目“救援井关键技术研究及实钻工程示范”(编号:YXKY-2017-DC-01)

摘　　要：油气井钻井作业井喷事故一旦发生,在抢险人员不能直接靠近井口读取井口压力参数的情况下,制订压井抢险方案的关键是准确测量和判定井喷液柱的高度。为此,基于OpenCV计算机视觉库的图像处理技术建立了井喷液柱高度的测量方法,包括:①在救援船上使用CCD相机对井喷液柱拍摄进行连续瞬态成像,每次对井喷液柱进行拍摄时应分别旋转120°拍摄3张照片;②对图像经过直方图均衡化、高频强调滤波预处理,再经过改进的Otsu算法进行二值化处理,分割出井喷液柱的轮廓;③利用数学形态学运算处理二值图像中的边界点与孔洞,采用参照物法计算出井喷液柱的实际高度。室内模拟实验的结果表明:①该方法对井喷液柱识别的准确率较高,误差约为6%,能够较为精确地获取井喷液柱高度;②实验过程中,处理一幅图像平均耗时0.86 s,可以满足事故发生后对井喷液柱的实时识别与测量要求。结论认为,该方法应用于对井喷液柱高度的测量是可行的,利用其对井喷图像进行程序化处理,可以在海上钻井平台井喷失控后实时连续测量井喷液柱高度,第一时间获取与井喷相关的关键参数,为压井抢险方案的制订提供依据。Once a blowout accident happens during oil and gas well drilling operation,the key to the formulation of a well-killing emergency plan is to accurately measure and determine the height of blowout liquid columns when the rescue personnel cannot approach to the wellhead directly to access the wellhead pressure parameters.To this end,this paper developed a method for measuring the height of the blowout liquid columns by virtue of the image processing technology based on the OpenCV computer vision library.The method includes the following three parts.First,use a CCD camera on a rescue boat to shoot the blowout liquid columns for continuous transient imaging.And each time the blowout liquid column is shot,take 3 photos after rotating it by 120°respectively.Second,images are pre-processed using histogram equalization and high-frequency emphasis filtering,and then they are binarized by means of the modified Otsu algorithm to define the outline of the blowout liquid columns.Third,the boundary points and holes in the binary images are processed by virtue of mathematical morphology operation,and the actual heights of the blowout liquid columns are calculated using the reference object method.The following results were obtained by conducting indoor simulation experiments.First,this method has a high accuracy in the identification of the blowout liquid column with an error about 6%,and it can measure the height of the blowout liquid column more accurately.Second,in the process of the experiments,the average time for processing one image is 0.86 seconds,which can meet the requirements for the real-time identification and measurement of the blowout liquid columns after an accident happens.In conclusion,this method is feasible to measure the heights of blowout liquid columns.When it is used for the programmed processing of the blowout images,the heights of blowout liquid columns can be measured continuously in real time after the blowout in the offshore drilling platform is out of control,and the key parameters related to the

关 键 词：海上钻井平台 井喷 液柱高度 图像识别 直方图均衡化 高频强调滤波 OTSU算法 抢险方案制订 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]