【摘要】 新场气田属于大型多层致密砂岩异常高压气藏,储层物性差,非均质性强,气井动用储量低。目前,为大幅度提高气井产能,提高储量动用长度,该气藏多采用多段压裂水平井开发。因此,迫切需要论证裂缝参数及其组合对多段压裂水平井开发效果的影响,为气藏下步科学高效开发和持续高产稳产提供理论基础。以川西新场气田为研究对象,采用数值模拟法深入研究了压裂水平井裂缝几何布局对气井产能的影响,包括非均匀裂缝长度、非均匀裂缝间距、压裂规模与裂缝数量、裂缝长度与间距的匹配、裂缝夹角与间距的匹配。结果表明:对于多段压裂水平井,U型模式的裂缝长度布局最优;均匀裂缝间距开发效果优于非均匀裂缝间距;水力压裂时,少段数长缝能取得更佳的开发效果;0. 67～1倍缝长的裂缝间距布局、垂直于井筒的正交裂缝布局有利于改善压裂水平井开发效果,裂缝间距的增大能有效降低非正交裂缝低夹角对产量的影响。更多还原

【Abstract】 The Xinchang gas field is a multi-layer tight sandstone gas reservoir with abnormally high pressure and poor reservoir properties. The gas well producing reserves are low. To significantly improve the well production rate,the gas reservoir was mostly developed by fractured-horizontal wells. Therefore,it is important to evaluate the influence of fracture parameters and their combinations on the multi-stage fractured-horizontal wells,and to provide a theoretical basis for the scientific and efficient development of gas reservoirs in the next stage.This work used the Xinchang gas field as an example. By using the numerical simulation method,the effects of fracture parameters on gas well productivity have been studied,including the non-uniform fracture length and its spacing,the scale of fracturing and the number of fractures,the correlations of fracture length and spacing,and the match of fracture angle and spacing. The results show that the U-mode fracture length layout is optimal for multi-fractured horizontal wells. The uniform fracture spacing is better than the non-uniform one. Less fractures but longer fracture lengths have higher economic benefits. When the fracture spacing is 0. 67-1 times of fracture length,it’s beneficial to improve the productivity of fracturing horizontal wells. Besides,an orthogonal fracture layout perpendicular to the wellbore can also improve the gas wells productivity.更多还原