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Aguada pichana气田位于Neu-quen省Neuquen盆地中部,它是目前阿根廷的主要气田之一。Mulichinco地层厚30～80m且整个产层的渗透率在纵向上是变化的。上部地层渗透率较低,下部地层的渗透率高,气体主要从下部地层产出引起气藏孔隙压力的差异性衰竭及储层的岩石力学性能发生变化。运用常规的单级压裂后,支撑剂主要分布在储层下部,对储层上部的作用不大,很难取得理想的增产效果。本文针对该区的具体情况采取了两级压裂新技术,第一阶段先压开下部渗透率较高的层段,同时为了防止将下部水层压开,在压裂液中加入相对渗透率调节剂(RPM);第二阶段对储层上部渗透率差的层进行压裂。该工艺实施后,增产效果明显,生产测井显示,产出的气体有65%来自上部低渗地层,有35%来自下部地层,表明储层上下部均被适当地改造。
The Aguada pichana gas field is located in the Neuquen basin of Neu-quen province, one of the major gas fields in Argentina. The Mulichinco formation is 30-80 m thick and the permeability of the entire formation varies longitudinally. The permeability of the upper strata is lower, the permeability of the lower strata is higher, the gas failure mainly occurs from the lower strata, and the rock mechanics performance of the reservoir is changed. After the conventional single-stage fracturing, the proppant is mainly distributed in the lower part of the reservoir, which has little effect on the upper part of the reservoir and it is difficult to obtain the ideal stimulation effect. In this paper, a new two-stage fracturing technology is adopted according to the specific conditions in this area. In the first stage, the section with the lower permeability is pressed first and the relative permeability is added to the fracturing fluid Modulator (RPM); the second stage fractures the layer with poor permeability in the upper part of the reservoir. After the implementation of the process, the stimulation effect is obvious. The production logging shows that 65% of the gas produced is from the upper low permeability formation and 35% from the lower formation, indicating that the upper and lower reservoirs are properly reformed.