Research on non-uniform inflow pattern of multistage fractured undulating horizontal wells in tight oil reservoirs
The influence of fracture orientation and horizontal well trajectory on productivity is significant.To deeply understand the impact of wellbore trajectory undulations and the varied morphology of artificial fractures on the productivity of fractured horizontal wells in tight oil reservoirs,a set of productivity prediction models for multi-fractured undulating horizontal wells in tight oil reservoirs was established.Models for multi-segment wells with undulating trajectories and non-Darcy flow in tight oil reservoirs were constructed,respectively.The coupling of wellbore flow and reservoir seepage was realized through the MRST sequential implicit coupling framework,and the productivity calculations were iteratively solved using the Newton-Raphson method.Based on this model,studies on the uneven inflow patterns of undulating horizontal wells were conducted,showing that:1)The earlier the non-symmetrical fractures enter the radial flow stage,the less sufficient the fluid flow within the reformed area;2)As the fracture deviation angle increases,the difference in the phase transition of fluid seepage increases,especially when the deviation angle increases to between 75° and 90°,the early radial flow gradually disappears;3)When the well's curvature is less than its length,the well's productivity is higher,and when the radius of curvature is greater than four times the chord length of the well,productivity significantly decreases.The findings on the uneven inflow patterns of undulating horizontal wells have important implications for well trajectory design and fracturing design in the extraction of tight oil.
NETL
NSTL
万方数据
