页岩气井暂堵重复压裂工艺技术研究及应用

Research and application of temporary plugging refracturing technology for shale gas wells

基于页岩气井初次压裂人工裂缝诱导应力变化规律,研究了暂堵重复压裂转向工艺。在对裂缝暂堵转向机理开展研究的基础上,对暂堵剂的粒径级配、暂堵时机、暂堵剂加量等工艺参数进行了优化,初步形成了适于页岩气暂堵重复压裂的裂缝暂堵转向技术。基于研究结果,对焦页A井开展了现场试验,压后产量较压前提高了5倍,取得了较好效果。本研究可为页岩气井暂堵重复压裂提供一定的借鉴。

According to the variation law of stress induced by hydraulic fractures during the initial fracturing of shale gas wells,the temporary plugging refracturing technology was studied.Based on the research on the mechanism of fracture reorientation from temporary plugging,the process parameters(such as the particle size combination of the temporary plugging agent,the temporary plugging timing,and the amount of temporary plugging agent)were optimized,and the key material for temporary plugging were evaluated.Temporary plugging refracturing technology suitable for shale gas horizontal well was initially formed.Excellent results of trial test were achieved and the production rate after refracturing was increased by 5 times compared with that before stimulation.This study can provide some reference for temporary plugging refracturing of shale gas wells.