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首页» 过刊浏览» 2017» Vol. 2» Issue (4) 457-465     DOI : 10.3969/j.issn.2096-1693.2017.04.042
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钻头电阻率测井仪器探测特性研究
康正明1, 2,柯式镇1, 2*,李新3,米金泰3,倪卫宁3,张冰1, 2,张红蕾1, 2
1中国石油大学(北京)油气资源与探测国家重点实验室,北京 102249 2中国石油大学(北京)地球物理与信息工程学院,北京 102249 3中国石化石油工程技术研究院,北京 100101
The detection characteristics study of the at-bit resistivity logging tool
KANG Zhengming1, 2, KE Shizhen1, 2, LI Xin3, MI Jintai3, NI Weining3, ZHANG Bing1, 2, ZHANG Honglei1, 2
1 State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum- Beijing, Beijing 102249, China 2 College of Geophysics and Information Engineering, China University of Petroleum- Beijing, Beijing 102249, China 3 Sinopec Research Institute of Petroleum Engineering, Beijing 100101, China

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摘要  钻头电阻率测量是一种服务于地质导向的方法,在钻井过程中可以有效地降低作业风险。开展钻头电阻率测井仪器探测特性的数值模拟是研制精密仪器的重要手段,但其复杂的螺绕环激励源为数值模拟带来困难,因此需要利用一种等效的方法来简化。本文利用三维有限元素法(3D FEM),将复杂的螺绕环激励源简化为延伸的电压偶极子,实现了钻头电阻率测井探测特性的数值模拟。考察了钻头电阻率测井探测深度、纵向分辨率与前视探边能力及其影响因素。数值模拟结果表明,钻头电阻率测井探测深度与泥浆类型、泥浆电阻率和井底钻具长度有关。钻头电阻率测井纵向分辨率取决于井底钻具长度,井底钻具长度越小,钻头测量分辨率越高。钻头测量具有一定的前视探边能力,其与源距没有关系,电导性地层前视能力好于电阻性地层。井底钻具长度越小,仪器的前视探边能力越好。本文结果可为钻头电阻率测井仪器设计与解释提供理论依据。
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关键词 : 3D FEM, 钻头电阻率, 探测深度, 纵向分辨率, 前视探边能力
Abstract

  At-bit resistivity measurement is a method for geosteering, which could effectively reduce the risk of drilling operations. Simulating the investigation characteristics of an at-bit resistivity logging tool is a means of developing precise tools, but it is difficult to perform this work because of the complex toroidal coil excitation. So a method is needed to simplify it. Based on 3D FEM, the complicated toroidal coils are simplified as an extended voltage dipole and the detection characteristics of the tool are simulated in this paper. The depth of investigation, vertical resolution, the boundary detection capacity and investigation characteristics effect factors of the tool are studied. The simulated results show that depth of investigation relates to the type of mud, the resistivity of the mud and the length of the bottom hole assembly (BHA). The resolution of the tool depends on the BHA length, and the shorter the BHA length is, the higher resolution of the tool is. The tool has the capacity of boundary detection and it has no connection with spacing. The look ahead capacity in conductive formations is better than that of the low-conductivity formations. The shorter the BHA length is, the better boundary detection capacity of the tool is. The results of this paper could provide theoretical support for design and interpretation of at-bit resistivity logging tools.

Key words: 3D FEM at-bit resistivity depth of investigation resolution boundary detection capacity
收稿日期: 2017-08-25     
PACS:    
基金资助:十三五国家科技重大专项“低渗透储层高精度随钻成像技术研究”(2016ZX05021-002)资助
通讯作者: 柯式镇, wksz@cup.edu.cn
引用本文:   
康正明,柯式镇,李新,米金泰,倪卫宁,张冰,张红蕾. 钻头电阻率测井仪器探测特性研究[J]. 石油科学通报, 2017, 2(4): 457-465. KANG Zhengming, KE Shizhen, LI Xin, MI Jintai, NI Weining, ZHANG Bing, ZHANG Honglei. The detection characteristics study of the at-bit resistivity logging tool. Petroleum Science Bulletin, 2017, 2(4): 457-465.
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