检索结果-南通市图书馆

Response analyses on the drill-string channel for logging while drilling telemetry

Petroleum Science 2023年第5期20卷 2796-2808页

作者： Ao-Song Zhao Xiao He Hao Chen Xiu-Ming Wang State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China Beijing Engineering Research Center of Sea Deep drilling and Exploration Institute of AcousticsChinese Academy of SciencesBeijing100190China

Downhole acoustic telemetry(DAT),using a long drill string with periodical structures as the channel,is a prospective technology for improving the transmission rate of logging while drilling(LWD)*** studies only focused on the acoustic property of a free drill string and neglected the coupling between pipes and fluid-filled *** addition to the drill-string waves,a series of fluid waves are recorded in the DAT channel,which has not been investigated *** channel characteristics result in lower transmission rates and stability than ***,a more realistic channel model is needed considering the fluid-filled *** this paper,we propose a hybrid modeling method to investigate the response characteristics of the DAT *** combining the axial wavenumbers and excitation functions of mode waves in radially layered LWD structures,the channel model is approximated to the 1-D propagation,which considers transmission,reflection,and interconversion of the drillstring and fluid *** proposed 1-D approximation has been well validated by comparing the 2-D finite-difference *** is revealed that the transmitted and converted fluid waves interfere with the drill-string wave,which characterizes the DAT channel as a particular coherent multi-path *** a fluid-filled borehole surrounds the drill string,the channel responses exhibit considerable delay as well as strong frequency selectivity in amplitude and *** new findings suggest that the complexity of the channel response has been underestimated in the past,and therefore channel measurements on the ground are *** address these channel characteristics,we apply a noncoherent demodulation *** transmission rate for synthetic data reaches 15 bps in a 94.5 m long channel,indicating that the acoustic telemetry is promising to break the low-speed limitation of mud-pulse telemetry.

关键词： logging while drilling Borehole geophysics Downhole acoustic telemetry Channel modeling Frequency selectivity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Elimination of LWD (logging while drilling) Tool Modes Using Seismoelectric Data

引用

Communications in Computational Physics 2010年第1期7卷 47-63页

作者： Xin Zhan Zhenya Zhu Shihong Chi M.Nafi Toksoz Earth Resources Laboratory Massachusetts Institute of TechnologyBuilding 54-181577 Massachusetts AveCambridgeMA 02142USA Petrophysics ConocoPhillips600 North Dairy AshfordHoustonTX 77252USA

Borehole acoustic logging-while-drilling (LWD) for formation evaluationhas become an indispensable part of hydrocarbon reservoir assessment [F. Citt ´a, C. Rus-sell, R. Deady and D. Hinz, The Leading Edge, 23 (2004), pp. 566-573]. However,the detection of acoustic formation arrivals over tool mode contamination has beena challenging problem in acoustic LWD technology. In this paper we propose a newmethod for separating tool waves from formation acoustic waves in acoustic *** method is to measure the seismoelectric signal excited by the LWD acoustic *** LWD tool waves which propagate along the rigid tool rim can not excite any elec-tric signal. This is due to the effectively grounding of the drill string during the LWDprocess makes it impossible to accumulate any excess charge at the conductive tool —borehole fluid interface. Therefore, there should be no contribution by the tool modesto the recorded seismoelectric signals. To theoretically understand the seismoelectricconversion in the LWD geometry, we calculate the synthetic waveforms for the multi-pole LWD seismoelectric signals based on Pride’s theory [S. R. Pride, Phys. Rev. B, 50(1994), pp. 15678-15696]. The synthetic waveforms for the electric field induced by theLWD-acoustic-wave along the borehole wall demonstrate the absence of the tool *** also designed the laboratory experiments to collect simulated LWD monopole anddipole acoustic and seismoelectric signals in a borehole in sandstone. By analyzing thespectrum of acoustic and electric signals, we can detect and filter out the differencebetween the two signals, which are the mainly tool modes and noise.

关键词： logging while drilling acoustoelectric logging multipole LWD seismoelectric sig-nal laboratory experiment numerical simulation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Self-adaptive inversion method of electromagnetic-propagation resistivity logging while drilling data

引用

Applied Geophysics 2022年第3期19卷 343-352,470页

作者： Xu Wei Huang Hang Li Xin Ke Shi-Zhen Key Laboratory of Exploration Technology for Oil and Gas Resources of Ministry of Education Yangtze UniversityWuhan 430100China Sinopec Research Institute of Petroleum Engineering Beijing 100101China Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China

Because of the constraint mode of the inversion objective function in the traditional resistivity-inversion method of electromagnetic-propagation resistivity logging while drilling(EPR-LWD),obvious differences appear in the radial and vertical investigation characteristics between the amplitude-ratio and phase difference,which affect the practical application of EPR-LWD *** this paper,according to the EPR-LWD data,a self-adaptive constraint resistivity-inversion method,which adopts a self-adaptive constraint weighted expression in the objective function to balance the contributions of the phase difference and amplitude attenuation,is proposed.A particle swarm optimization algorithm is also introduced to eliminate the dependence of the accuracy and convergence on the initial value of the *** to the inversion results of multiple classical formation models for EPR-LWD,the differences between the adaptive constraint inversion-resistivity logs with the traditional amplitude-ratio and the phase difference of the resistivity logs are discussed in *** results demonstrate that the adaptive resistivity logs take into account the advantages of the amplitude-ratio logs in the radial investigation and phase difference logs in the vertical ***,it is superior in thin-layer identification and invasion-effect appraisal compared with the single-amplitude-ratio and phase difference *** inversion results can provide a theoretical reference for research on the resistivity-inversion method of electromagnetic wave LWD.

关键词： logging while drilling particle swarm optimization finite-element method inversion problem

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

logging-while-drilling formation dip interpretation based on long short-term memory

引用

Petroleum Exploration and Development 2021年第4期48卷 978-986页

作者： SUN Qifeng LI Na DUAN Youxiang LI Hongqiang TANG Haiquan College of Computer Science and Technology in China University of Petroleum Qingdao 266580China drilling Technology Research Institute of Shengli Petroleum Engineering Corporation Limited SinopecDongying 257000China Measurement and Control Technology Research Institute of Shengli Petroleum Engineering Corporation Limited.Dongying 257000 China

Azimuth gamma logging while drilling(LWD)is one of the important technologies of geosteering but the information of real-time data transmission is limited and the interpretation is *** study proposes a method of applying artificial intelligence in the LWD data interpretation to enhance the accuracy and efficiency of real-time data *** examining formation response characteristics of azimuth gamma ray(GR)curve,the preliminary formation change position is detected based on wavelet transform modulus maxima(WTMM)method,then the dynamic threshold is determined,and a set of contour points describing the formation boundary is *** classification recognition model based on the long short-term memory(LSTM)is designed to judge the true or false of stratum information described by the contour point set to enhance the accuracy of formation ***,relative dip angle is calculated by nonlinear least square *** of azimuth gamma data and application of real-time data processing while drilling show that the method proposed can effectively and accurately determine the formation changes,improve the accuracy of formation dip interpretation,and meet the needs of real-time LWD geosteering.

关键词： logging while drilling azimuth gamma stratigraphic identification artificial intelligence long short-term memory wavelet transform

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Deep-large faults controlling on the distribution of the venting gas hydrate system in the middle of the Qiongdongnan Basin, South China Sea

引用

China Geology 2024年第1期7卷 36-50页

作者： Jin-feng Ren Hai-jun Qiu Zeng-gui Kuang Ting-wei Li Yu-lin He Meng-jie Xu Xiao-xue Wang Hong-fei Lai Jin Liang National Engineering Research Center of Gas Hydrate Exploration and Development Guangzhou 511458China Guangzhou Marine Geological Survey China Geological SurveyGuangzhou 511458China China Geological Survey Ministtry of Natural ResourcesBeijing 100037China

Many locations with concentrated hydrates at vents have confirmed the presence of abundant thermogenic gas in the middle of the Qiongdongnan Basin(QDNB).However,the impact of deep structures on gasbearing fluids migration and gas hydrates distribution in tectonically inactive regions is still *** this study,the authors apply high-resolution 3D seismic and logging while drilling(LWD)data from the middle of the QDNB to investigate the influence of deep-large faults on gas chimneys and preferred gasescape *** findings reveal the following:(1)Two significant deep-large faults,F1 and F2,developed on the edge of the Songnan Low Uplift,control the dominant migration of thermogenic hydrocarbons and determine the initial locations of gas chimneys.(2)The formation of gas chimneys is likely related to fault activation and *** chimney 1 is primarily arises from convergent fluid migration resulting from the intersection of the two faults,while the gas chimney 2 benefits from a steeper fault plane and shorter migration distance of fault F2.(3)Most gas-escape pipes are situated near the apex of the two *** reactivations facilitate free gas flow into the GHSZ and contribute to the formation of fracture‐filling hydrates.

关键词： Venting gas hydrates Deep-large faults Gas chimney Gas-escape pipes High-resolution 3D seismic logging while drilling Qiongdongnan Basin South China Sea

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Deep-detection of formation boundary using transient multicomponent electromagnetic logging measurements

引用

Petroleum Science 2022年第3期19卷 1085-1098页

作者： Xi-Yong Yuan Shao-Gui Deng Zhi-Qiang Li Xiao-Mei Han Xu-Fei Hu Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)QingdaoShandong266580China Sinopec Matrix Corporation QingdaoShandong266000China China Research Institute of Radiowave Propagation XinxiangHenan453000China China University of Petroleum—Beijing at Karamay KaramayXinjiang834000China

The maximum distance at which an electromagnetic(EM)logging while drilling(LWD)tool detects an approaching boundary is defined as the depth of detection(DOD).Ultra-deep detection capability of the transient multicomponent EM logging measurement is investigated ***,we adopt sine and cosine transform to calculate the transient multicomponent *** to the cosine transform,sine transform is more accurate in solving late-time ***,a time-domain geosignal is introduced to sense the *** show that DOD of this transient EM measurement can be up to tens of meters,including directionally ***,by studying the decay characteristics of different components with time,cross component is confirmed to decay much faster than the coaxial/coplanar components in the formation coordinate system.A pseudo-inversion is thereby proposed to determine the dip angle of anisotropic stratified *** simulation results indicate that this algebraic method can determine the true dip at some particular *** is still stable and valid even when considering random measurement ***,we establish the linear relationship between the time at which the half-point of geosignal curve appears and the distance to boundary(DTB),which would assist in the quick determination of DTB.

关键词： Time-domain logging while drilling Formation boundary Dip angle Distance to boundary

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Acoustic reflection well logging modeling using the frequency-domain finite-element method with a hybrid PML

引用

Applied Geophysics 2018年第1期15卷 35-45,148页

作者： Wang Bing Kuo Zhang Guo Tao He Liu Zhang Xiao-Liang State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing 102249 China China Center for Information Industry Development Beijing CCID Publishing ＆ Media Co. Ltd. Beijing 100048 China Department of Petroleum Geoscience Khalifa University Abu Dhabi United Arab Emirates 2533 Well logging Company Western Drilling Engineering Corporation CNPC Karamay Xinjiang 834000 China

In this paper, we propose a hybrid PML （H-PML） combining the normal absorption factor of convolutional PML （C-PML） with tangential absorption factor of Mutiaxial PML （M-PML）. The H-PML boundary conditions can better suppress the numerical instability in some extreme models, and the computational speed of finite-element method and the dynamic range are greatly increased using this HPML. We use the finite-element method with a hybrid PML to model the acoustic reflection of the interface when wireline and well logging while drilling （LWD）, in a formation with a reflector outside the borehole. The simulation results suggests that the PS- and SP- reflected waves arrive at the same time when the inclination between the well and the outer interface is zero, and the difference in arrival times increases with increasing dip angle. When there are fractures outside the well, the reflection signal is clearer in the subsequent reflection waves and may be used to identify the fractured zone. The difference between the dominant wavelength and the model scale shows that LWD reflection logging data are of higher resolution and quality than wireline acoustic reflection logging.

关键词： Frequency domain finite-element method hybrid PML boundary wireline well logging logging while drilling

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：