Visual Navigation Precision Drilling Technology under Channel Deposit Environment
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摘要: 河道沉积地层由于受河流冲刷的影响，地层沉积分布不均，砂体变化大，造成钻井定向施工困难，为此开展了井下可视化精准导航钻井技术研究。采用以多井测井细分层为垂向地层约束、以地震层面为横向约束的井周地层反演技术，构建了井周地层可视化模型，并以待钻井方位为基础，提取模型垂向剖面，形成地层钻井导航模型，支撑钻井快速准确钻达目标层位。可视化精准导航钻井技术在杭锦旗JPH-X井进行了现场试验，通过对比构建的导航模型与前期二开实际钻遇地层，发现所建导航模型与实际数据完全一致，表明所建导航模型准确；基于该模型进行了三开钻井侧钻位置确定及钻井施工导航，顺利完成了水平段施工，砂岩钻遇率达到了100%。井下可视化精准导航钻井技术为河道沉积地层优快钻井施工提供了新的技术手段。Abstract: Due to the influence of river erosion,the sedimentary strata of the fluvial channel are unevenly distributed and the sand body variation is obvious,which result in challenges in directional drilling operation.For this reason,the underground visual navigation precision drilling technology was studied.The wellbore peripheral stratigraphic visualization model was built by stratigraphic inversion technique,i.e.taking the multi-well logging subdivided layers as the vertical stratum constraint and using the seismic horizon as the lateral constraint.The formation drilling navigation model was established by extracting the vertical slice on the basis of the azimuth of well to be drilled,which enables the rapid drilling and accurate target hitting.Field test verification of visual navigation precision drilling technology was carried out in Well JPH-X,Hangjinqi Block.By comparing and analyzing the navigation model with the actual drilling data of second section in the early stage,the model was found to be completely consistent with the actual data,indicating the accuracy of this navigation model.This model is applied to determine the sidetracking position in the third section,and the drilling navigation was performed in horizontal section,with the sandstone encountering rate of 100%.The underground visual navigation precision drilling technology provides a new technical means for rapid and excellent drilling of channel sedimentary strata.
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Keywords:
- channel deposit /
- stratigraphic section /
- visual model /
- navigation /
- encountering rate
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