Well Trajectory Controlling And Reservoir Evaluation Of Horizontal Well Of Es2 In Zhuang129-Xie10 Block

Zhuang129-Xie10 block is located in Tanhai area,Jiyang depression.With the continuous process of oil reservoir exploration and development,the cost of ordinary platform production is high and the result of development is not ideal.Therefore,it is very significant to use logging data to monitor effectively the well trajectory of large displacement horizontal well,to evaluate oil and gas in horizontal section,and to improve the drilling rate of oil formation of large displacement horizontal well,which can reduce the cost of production and improve the production efficiency of this block.Based on the study of the basic geological characteristics of Zhuang129-Xie10 block,combined with the development laws,Zhuang129-1HF well was drilled,which is the first large displacement horizontal well in the block that can achive the offshore oil developed on the land.Used the data of geology,logging,seismic and geological formation while drilling,the "window entry" point of the horizontal well is calibrated to establish a two-dimensional geological trajectory model.And the well trajectory was monitored in real time,to improve the drilling catching rate of the horizontal reservoir.Gas logging,qualitative fluorescence logging,geochemical logging,quantitative fluorescence logging and other logging techniques are used to evaluate the reservoirs in the horizontal section to improve the interpretation efficiency of oil reservoir.The reservoir of Es2 is distributed in northeastern strip shape in Zhuang129-HF well.The average thickness is 15 m and the horizontal displacement is 3396.67 m.The reservoir of Es2 is characterized by medium porosity,medium permeability and light oil quality.The designed window entry point and target depth are calculated and corrected through the time-depth relationship of the seismic survey line.Based on the data conversion of vertical depth to oblique depth,the formation of window entry point is accurately analyzed by stratigraphic correlation with drilling while entering the window and the changes of carbonate content before and after entering the window.The two-dimensional geological trajectory model is established by comprehensively using the trajectory data of designed well,the trajectory data of actual drilling well,the top and bottom boundary data of designed oil reservoir and the top and bottom boundary data of actual drilling oil reservoir,then combining drilling time,gas logging,cuttings,drilling gamma resistivity and resistance curves,X-ray element logging and other data in the reservoir and non-reservoir to determine whether the bit is out of oil reservoir and realize realtime monitoring,tracking,and the trajectory of the large displacement horizontal section,to improve the drilling rate of oil reservoir in horizontal section.The horizontal section of the whole well is drilled at 640.80 m and the effective drilling rate of oil reservoir reaches to 92.1%,which achieved the goal of well trajectory control.Combined with logging techniques such as gas logging,qualitative fluorescence logging,geochemical logging,quantitative fluorescence logging,etc.,the comprehensive interpretation and evaluation of oil and gas reservoir in the horizontal section of Es2 is carried out through comprehensive analysis and judgment of the logging parameters related to the evaluation of hydrocarbon reservoir.The whole well recognized 629.0m/24 layers of oil formation and the poor oil formation and 13.2m/4 layers of dry formation.The oil and gas shows are good,which provides a basis for the oil test and fracturing in the future.