致密油藏水平井压裂后油压特征及压裂效果分析——以昌吉油田3口水平井为例

致密油藏需要大规模体积压裂才能有效动用，对压裂效果的评价尤为重要。压裂后开井油压值及变化特征与缝网体的体积和单个破碎块的大小有着密切关系，是评价压裂效果的实用参数。油压折算到油层的压力越接近平衡压力，说明压裂形成的缝网体破碎块半径小，同样累计产液百分数下压力变化百分数小，相同压裂液体积形成的缝网体积大，压裂效果好。

Tubing Pressure Characteristics and Fracturing Response Analysis of Horizontal Well in Tight Reservoir An example from three horizontal wells in Changji oilfield of eastern Junggar basin

Tight oil reservoir development requires large?scale volume fracturing for effectively producing, so the evaluation of the fracturing response is particularly important. The tubing pressure change characteristics after fracturing have a closely relationship with the fracture network system volume (FNSV) or stimulated reservoir volume (SRV) and the size of the single broken pieces or blocks, which is a practical parameter for the evaluation of fracturing effect. If the reservoir pressure converted from the tubing pressure is close to the equilibrium pressure, the radius of the broken pieces in the SRV is relatively small. Similarly, the less pressure change percentage under the cumulative percentage of produced fluid, the bigger SRV shaped under the same fracturing fluid volume, and the better the fracturing effect is