Analysis and Design of Orthogonal Experiments for Horizontal Well Parameters in Ultra-low Permeability Reservoirs

It was Considered that the productivity influential factors of horizontal wells were interfered and correlated each other in ultra-low permeability reservoirs.Traditional single factor analysis was difficult for quantitative describing the effect of productivity of horizontal wells on the sequences and obvious level of production.In consideration of the problem,an orthogonal design of experiments was introduced for a direct analysis on the influence of fracturing parameters and parameters of horizontal wells on production,including the number of fractures,the half-length of fracture,its transmission ability and the length of horizontal wells.Based on the result,an optimal and combined program is chosen for fracturing parameters of ultra-low permeability reservoir development in horizontal wells and their length,it provides a guidance for the optimization of design of production plan of horizontal wells in ultra-low permeability reservoirs.