低渗透薄互层油藏压裂水平井开发井网优化方法研究

Pattern optimization of hydraulically fractured horizontal wells in low permeability and thin interbedded reservoirs

根据F147区块低渗透薄互层油藏的地质特征,利用数值模拟与油藏工程方法,研究了水平井与直井联合布井井网方位、井网类型和井距排距对开发效果的影响。结果表明:该块压裂水平井与直井联合布井井网方位应以水平井位置平行于最小地应力方向为最优;井网类型应选择反九点井网;考虑启动压力梯度下F147区块极限供油半径为110 m;井网井距应该选择400 m×200 m(井距×排距)为最优。该研究对于提高压裂水平井开发此类油藏的开发效果具有重要的参考价值。

The impacts of well pattern azimuth,types,well spacing and array on development response as well as the placement of horizontal and vertical wells are studied by using numerical simulation and reservoir engineering methods according to the geological characteristics of the thin interbedded and low permeability reservoirs in F147 block.The result shows that in the combined pattern of hydraulically fractured horizontal well and vertical well,the azimuth of the horizontal well is optimum in parallel to the smallest terrestrial stress;inverted nine-spot pattern shall be adopted;the limit drainage radius for F147 reservoir is 110m with consideration of threshold pressure gradient;the optimum well pattern and spacing is 400 m × 200 m(well spacing × array spacing).This study is of important reference value to the recovery from hydraulically fractured horizontal wells in similar reservoirs.