Casing Window Sidetrack Horizontal Well Geological Evaluation Technology Research In XingBei Block Of Daqing Oilfield

After years of exploration and development, because of the casing damage, high water, low production, complex accident and discard of the well,shut in the well are increases year by year,the daqing oilfield has already got into high water cut development phase.Open the window to tap the implementation of horizontal sidetrack use oil reservoir’s residual oil, enhancing oil recovery, and can make full use of the existing oil well drill ground facilities and resources, and so on,to improve efficiency of resource utilization, In this paper for the construction of remaining oil distribution at the well, construction well drilling off limits and scheme optimization, field geological tracking guidance technology, the effect factors of remaining oil distribution analysis, found the remaining oil enrichment of the block and horizon, for casing window side drilling optimization of a geological tapping a foundation; Through the study of reservoir pressure distribution block influence the formation permeability, spacing, pressure drop, adjacent Wells yield, the pressure coefficient and interference between the layer factors such as research, determined the casing window side drilling limits, establish the objective top layer forecast method, and drilling process of MWD and cutting logging, gas logging comprehensive logging combined, real-time monitoring the hole trajectory, and the time at the top of the reservoir prediction.To improve the rate of drilling in purpose. In the course of the study, establish the drilling and shut-in pressure mathematical model, and combining with the drill pass laws and improve the prediction accuracy of pore pressure coefficient. Establishing the objective top layer forecasting model and the scene with drilling geological guidance technology model, so that the actual coincidence rate of the target area and the actual geological design reached100%.