长8储层直井体积压裂施工参数优化研究

长庆油田长8储层属于低孔低渗储层,通过借鉴国外体积压裂理念及改造经验,进行了直井体积压裂探索研究与试验,取得了较好的改造效果。以改善长8低渗储层开发效果为目标,在分析长8储层地质特征的基础上,对已有的体积压裂井施工参数的合理性进行了分析;并进行前置液比例、排量、砂比等施工参数的优化。研究发现,长8储层适合的前置液比例15%~20%,合理排量为6~8 m3/min,合理砂比为11%~13%,将优化结果用于同区的其他井,增产效果显著。

Optimization of Volumetric Fracturing Parameters in the Formation of Chang 8

Formation of Chang 8 in Changqing Oilfield holds a property of low porosity and low permeability. By introducing foreign ideas for volumetric fracturing and experience of reservoir reconstruction, volumetric fracturing was studied and tested in Changqing Oilfield and stimulation is achieved. The aim of this paper is to improve development efficiency through optimization of volumetric fracturing parameters. On the base of analyzing the fracturing geological characteristics of Chang 8 area and put forward a method that using the results of micro-seismic monitoring technology to set a fracturing model, then optimized the fracturing parameters on the base of the model. Finally, get the reasonable fracturing parameters, the reasonable pad fluid proportion is 15%~20%, the delivery rate is 6~8m₃/min, the sand liquid ratio is 11%~13%. The optimizing results are used in other wells in the same area, and get a better stimulation effect.