裂缝储集层的完井特点

裂缝性储层具有裂缝分布不均匀性及在一定条件下发生闭合、垂直发育等特点，运用常规钻井和完井方法不易取得好的勘探开发效果。对裂缝储层的基本特征、裂缝闭合机理、钻开裂缝的方法以及完井底部结构特点进行了分析，提出对于裂缝储层应使用裸眼完井方法，并指出在钻开储层时适当提高钻井液的密度，对保护油气层有利。裂缝储层中水平井完井应采用裸眼、筛管、衬管、封隔器等完井措施，不必用水泥封闭套管，因为井眼在同一岩层中不存在压力差异。

COMPLETION FEATURES FOR FRACTURE RESERVOIR

Unlike porvus reservoir, the characteristics of fracture reservoir, including fracture distribution like a band, its inhomogcnons, fracture closing under certain conditions and vertically developed in most case, have a significant influence on well completion. Open hole completion is suitable in fracture reservoir, and the density of drilling fluid should be increased when the reservoir was opened. Some completion measures, including open hole completion, screen pipe and packer, should be used for well completion of fracture reservoir in horizontal well.