渭北油田缝高延伸规律及机械分压技术选择界限研究

Fracture height extension law and mechanical layer fracturing technology option limit in Weibei oilfield

渭北油田属于低孔低渗浅层致密储层,主要采用多层合压及机械分压工艺压裂投产。针对机械分压工艺,要求隔层具备一定的遮挡能力,若对压裂缝高延伸情况判断不准确,容易导致"串层",影响压后效果。测井曲线与室内实验数据相结合,建立了渭北油田长3储层岩石力学及地应力模型,通过压裂软件模拟分析了压裂缝高延伸规律,确定了机械分压工艺技术界限。

As low porosity and low permeability shallow tight reservoir, Weibei oilfield mainly adopts multi-layer fracturing and mechanical layer fracturing technology. In terms of mechanical layer fracturing, interlayer needs sufficient blocking ability, however, the inaccurate judgment of fracture height extension may cause cross strata and influence fracturing effects. Combined with logging curves and laboratory experimental data, rock mechanics and ground stress models of Chang- 3 reservoir are established. Through fracturing software, this paper analyses fracture height extension law and determines mechanical layer fracturing technology option limit.