HTB plans to drill a new horizontal well. Due to the limited position of the surface wellhead, the local high-quality reservoirs cannot be fully utilized, and the spoon-shaped horizontal well can increase the length of the effective horizontal section and improve the production. To reach this goal, a mudstone interlayer model is built to assist the optimal design of the horizontal well trajectory and improve the sandstone drilling rate. Firstly, the mudstone interlayer data of a single well is obtained through inter-well comparison, and the approximate distribution range of the mudstone interlayer among the wells is obtained according to the number of the mudstone interlayer. Then, the deterministic mudstone interlayer model is obtained by the modeling software. Secondly, based on the lithological data of wells, the lithological model is obtained by using the stochastic modeling method. Finally, the mudstone interlayer part in the deterministic model is retained while the two models are merged. The merged result is the final lithological model. Although conventional drilling can meet the drilling requirements, the reference geological design is not detailed enough. However, the assessment standards of this horizontal well are very high and the detailed geological modeling results are used to assist the horizontal well tracking while drilling. Through the comparative analysis of actual drilling data, adjacent well data and lithology models, the drilling trajectory is adjusted in time. The fine 3D lithofacies model established greatly reduces the uncertainty of the model and is corroborated by on-site core and gas measurement data, which saves time for determining the optimization and adjustment of the well trajectory. Common mudstone interlayer models are generally hypothetical, theoretical, and homogeneous models. This model is based on actual data and is established by combining deterministic and stochastic simulations. It is also applied to tracking while drilling and well trajectory optimization, which is the first of its kind in this innovative field. It has created a record of the longest horizontal section and the shortest drilling time in the fourth stage of adjacent wells of the same type. The HUHWK is the first large-scale reverse-displacement horizontal well, creating a precedent for deflecting from the AJH Formation, laying a good foundation for the promotion and application of spoon well technology in Xinjiang Oilfield.