An efficient method for drilling trajectory optimization based on seismological and geological guidance of VSP data during drilling and its application
Jing-Ya YANG1, Xiang-Wen LI1, Yong-Lei LIU1, Bo XU1, Jiang-Tao GAO1, Mao WANG1, Jiang-Yong WU2, Quan ZHANG1
1. Bureau of Geophysical Prospecting ( BGP) Company of CNPC,Zhuozhou 072750,China 2. Exploration and Development Research Institute of Tarim Oilfield Company,Korla 841000,China
There are several Ordovician carbonate fractured-vuggy type oil and gas fields in the Tarim Basin.With the continuous development and production of the reservoirs,the small and medium sized fractured-vuggy systems have become the main targets of capacity development.In the process of exploration and development,due to the influence of complex formation velocity,there is a certain error in seismic migration data,which often leads to the failure of drilling.In this paper,an efficient drilling track optimization method based on VSP data for seismic data processing is proposed.First,the VSP velocity and the new triangular mesh model are used to effectively correct the original seismic migration velocity field,and then the modified anisotropic parameter field is used for quick migration.Secondly,the structural characteristics of the whole strata are analyzed in the new data,the positions of the reservoirs are predicted,and the targets are determined.Finally,according to the engineering and geological conditions,the most economical optimal design of the drilling trajectory is used to drill into the target.The application shows that the relatively good effect is obtained in Tazhong area of Tarim Oilfield,and the imaging quality of seismic data has been improved obviously.After well track adjustment,the rates of drilled reservoir and the directly put on production are increased by 16% and 13.2% respectively.The low cost and effective development plan of the oilfield is effectively promoted and implemented.
杨敬雅, 李相文, 刘永雷, 徐博, 高江涛, 王茂, 吴江勇, 张泉. 一种基于随钻VSP地震地质导向的钻井轨迹高效优化方法及其应用[J]. 物探与化探, 2019, 43(2): 257-265.
Jing-Ya YANG, Xiang-Wen LI, Yong-Lei LIU, Bo XU, Jiang-Tao GAO, Mao WANG, Jiang-Yong WU, Quan ZHANG. An efficient method for drilling trajectory optimization based on seismological and geological guidance of VSP data during drilling and its application. Geophysical and Geochemical Exploration, 2019, 43(2): 257-265.
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