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identification and control of Several Leaf Diseases of Poplar

Plant Diseases and Pests 2022年第4期13卷 14-16页

作者： Weishuang TONG Jingwen HUANG Huashan GAO School of Chemical and Environmental Engineering Pingdingshan UniversityPingdingshan 467000China

This paper introduces the identification characteristics,occurrence regularity and control methods of several leaf diseases of poplar,including poplar angular leaf spot,poplar large spot,poplar leaf blight and poplar rust,in order to provide the basis for the healthy growth of poplar and the technical support for the sustainable development of forestry industry.

关键词： Poplar Poplar angular leaf spot Poplar large spot Poplar leaf blight Poplar rust identification and control

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Analysis of Multiple Annular Pressure in Gas Storage Well and High-Pressure Gas Well

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Energy Engineering 2023年第1期120卷 35-48页

作者： Lihu Cao Jinsheng Sun Bo Zhang Nu Lu Yuqiang Xu School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580China Tarim Oilfield Company PetroChinaKorla841000China CNPC Research Institute of Safety and Environment Technology Beijing102206China Research Institute of Petroleum Exploration&Development PetroChinaBeijing100083China

In gas storage or high-pressure gas wells,annular pressure is an unavoidable threat to safe,long-term resource *** more complex situation,however,is multiple annular pressure,which means annular pressure happens in not only one annulus but two or *** a situation brings serious challenges to the identification of well ***,few researches analyze the phenomenon of multiple annular ***,this paper studies the mechanism of multi-annular pressure to provide a foundation for its prevention and ***,the multi-annular pressure is classified according to the mechanism and field *** the failure mechanism and function of the wellbore safety barriers in the process of passage formation are ***,some suggestions are put forward for identifying and controlling multi-annular *** results show that gas storage wells and high-pressure gas wells have the conditions to generate pressure channels,which leads to the expansion of annular pressure from a single annulus to multiple *** pressure channel is composed of the tubing string,casing string,and a cement mantle,and the failures among the three have causal and hierarchical *** to the channel direction,it can be divided into two types:tubing-casing annulus to casing annulus and casing annulus to the tubing-casing annulus,of which the former is more *** measures can be considered to prevent pressure channeling,including improvement of cementing quality,revision of maximum allowable annular pressure,and suitable frequency of pressure relief.

关键词： Multiple-annular pressure pressure channel generation mechanism identification and control

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