The Horizon Well Trajectory Control Technology Based on Directional and Geosteering Integration Technology and Its Application

With the development of oil and gas fields, ultra-deep and complex thin oil and gas reservoirs have become the focus of current development. At present, ultra-long horizontal well drilling mode is often used in oilfield development. The geological difficulties we face include difficulty in formation structure identification, low reservoir prediction accuracy, difficulty in well trajectory control, short exploration distance before Geosteering model, difficulty in taking into account the “double sweet spot” target of geological engineering, and weak forward and backward linkage of Geosteering, which directly lead to frequent formation of trajectory, low reservoir drilling rate, large dogleg degree, abnormal curvature change of borehole trajectory and other geological engineering problems. To this end, this paper studies and forms the trajectory control technology of Directed and Geosteering integration, integrates multi-source data, builds a high-precision Geosteering model based on Seismic logging calibration and combined real-time processing of well and seismic, optimizes target and trajectory design, and optimizes the combination of guidance tools. In drilling, various measurement data and real-time prediction and processing technology of well seismic are integrated, the Geosteering model is reconstructed, and the trajectory design is optimized in real time according to the “double dessert” of geological engineering, and the Geosteering instructions are formed. Regional evaluation was carried out after drilling, and the 3D geological model was iteratively corrected to provide support for subsequent target optimization and trajectory design. This technology has been verified by multiple horizontal Wells, and the drilling rate of the reservoir has reached more than 95%, and the dogleg degree of the horizontal well is controlled below 1.5°/30 m. With the optimization and iteration of multiple rounds of technology, the smoothness of the wellbore trajectory in the same block has gradually improved.