过套管偶极横波成像测井压裂缝高度检测技术

The Technology for Detecting Hydraulically Created Fracture Height with DSI Data Behind Casing

针对压裂试油效果与测井综合解释不符合的储层,应用过套管偶极横波成像测井提供套管外地层快慢横波时差、反映射孔井段附近储层各向异性的特性,可以检测出压裂裂缝纵向延伸高度,评估压裂改造效果,确定试油与测井解释不符的原因;上油下水型储层的压裂改造中应用过套管偶极横波成像测井检测压裂缝纵向延伸高度,可判定施工工艺的控水效果,有效指导这一类储层的压裂施工方案,提高试油成功率。通过46口井压裂裂缝延伸高度的检测证明,过套管偶极横波成像测井方法可行,应用效果显著。

Reservoirs in Ordos oilfield determined from post-frac oil production tests are often not the ones identified by log interpretations. The DSI data provide interval transit time of P-wave and S-wave, which is used to reflect nonisotropy characteristics in the above reservoirs near the perforated intervals and detect vertical post-frac extension height, based on which evaluated are post-frac responses and found out is why the reservoirs determined from the post-frac oil produc- tion test are different with the ones identified by log interpretation. In the fracturing for the res- ervoirs with upper oil and lower water, the DSI data may help us detect the vertical post-frac ex- tension height, judge the water-control effect and effectively direct such a reservoir＇s fracturing operations to enhance oil-test efficiency. The hydraulically created fracture heights of the forty six wells are detected successfully, it＇s application effect is very prominent.