With the further exploration and development of oil and gas fields in China,horizontal Wells,as an important means of efficient development of oil and gas reservoirs,are gradually popularized and applied in major oil and gas fields.However,the drilling rate of different types of horizontal Wells varies greatly,which seriously affects the oil and gas production of horizontal Wells.On the basis of seismic,logging,logging and analysis data,the main geological factors restricting different types of oil and gas reservoirs are clarified,and the techniques and methods for improving the drilling rate of horizontal well target box are expounded.The research shows that the types of oil and gas reservoirs developed by horizontal Wells mainly include shale oil and gas,tight oil and gas,deep carbonate oil and gas,thin layer of edge and bottom water,heavy oil and coal bed gas,and the drilling rate of some types of horizontal Wells is lower than 90％.The main geological factors affecting the above five types of oil and gas reservoirs are the rapid change of microstructure development and formation occurrence in complex fault zones,large change of transverse thickness and physical properties of sandstone and interlayer,unclear location and fluid properties of reservoir groups,"easy formation above,easy water under"of thin oil layers,and large seismic depth and target error.Matching the characteristics of different oil and gas reservoir types,applying the combined fine geological modeling to guide the optimization trajectory,the precise inversion of the target layer characteristics with seismic information,the determination of the intersecting relationship between the well trajectory and the formation by bearing gamma while drilling,the identification of the sand body boundary along the drilling side logging technology,and the auxiliary determination of the bottom hole position by element logging.It can effectively improve the target box drilling rate of horizontal Wells of different reservoir types.The above results and understanding have important guiding significance for the optimal and rapid oriented drilling and efficient development of oil and gas fields mainly in horizontal well development.
hydrocarbon reservoir typehorizontal welldrilling rate of target boxinfluencing factorstechnical countermeasure
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