【摘要】 鄂尔多斯盆地杭锦旗区块属于典型的低渗透致密砂岩气藏,水平井分段压裂是最有效的增产改造方式。水平井分段多簇压裂裂缝布局对于压裂后产能具有重要影响,为使水平井压裂后产能最大化,运用位势理论和势叠加原理,考虑缝间干扰、启动压力梯度、耦合储层渗流与裂缝流动,建立低渗透致密砂岩气藏压裂水平井非稳态产能预测模型,利用该模型可以同时计算平直裂缝以及弯曲裂缝的产能。以杭锦旗区块锦58井区盒3层为例,利用正交设计方法研究了压裂段内不同裂缝簇数条件下裂缝参数对水平井压裂产能的影响规律。结果显示,每段3簇裂缝以及4簇裂缝所得结果一致,即裂缝参数对压裂产能的影响由强到弱依次为总裂缝半长、缝长比、裂缝导流能力、间距比,推荐在该区块采用"U"型布缝以及非均匀布缝模式。更多还原

【Abstract】 Hangjinqi block in Ordos Basin is a tight sandstone gas reservoir with low porosity and permeability. To developthis type of reservoir with multi-stage fractured horizontal well is the most effective way. The fracture distribution of multi-cluster staged fracturing for the horizontal well has a significant influence on gas production. In order to get the highest gasproductivity,an unsteady productivity prediction model was proposed in the consideration of fracture interference,thresh-old pressure gradient,and the coupling of flow in both fractures and matrix based on the potential theory and potential su-perposition principle. The gas productivity of both straight fractures and curved fractures can be estimated with the model.In this study,He3 Formation of Jin58 well area in Hangjinqi block was studied. Influence of fracture parameters on the gasproductivity in each stage was discussed with orthoganality design method in conditions of different clusters. The resultsshow that the influence of the fracture parameters on the gas productivity for either three or four cluster fractures in eachstage from strong to weak are as follows:the half length of total fracture,length ratio,fracture conductivity,and the space ra-tio. The"U"pattern and nonuniform fracture pattern are recommended for this block.更多还原