四川页岩气开发排水采气技术优选

Optimization of Drainage and Gas Recovery Technology for Shale Gas Development in Sichuan Block

页岩气是一种非常重要的非常规能源,开发潜力巨大。四川盆地海相页岩储层埋藏深、储层致密、孔隙度和渗透率较低,天然气产量衰减较快,因此优选稳产、增产的排水采气技术尤为重要。页岩气井具有低压低产时间长、采用排水采气措施生产周期长的特点,文章对四川地区常用的排水采气方法进行了适应性评估,基于低成本、分期有效的原则,首先下入利用储层自身能量的速度管柱进行生产,速度管柱携液困难后再选择实施泡排、柱塞、气举、泵类排水采气等工艺措施,为页岩气井中后期排水采气技术优选提供参考。

Shale gas is an important unconventional energy source with great potential for development.However,the marine shale reservoirs in Sichuan Basin is of deep burial,tight,low porosity and permeability,and rapidly decline of natural gas production.Therefore,it is particularly important to select the drainage gas recovery technology,which can stabilize and increase the production.Shale gas well is characterized by low pressure,low production and long production cycle used for drainage and gas recovery measures.The adaptability of drainage and gas recovery method commonly used in Sichuan has been evaluated.Based on the principle of low cost and effective in stages,it is necessary to run a velocity string that utilizes the energy of the reservoir itself for production.Then other technological measures such as bubble drainage,plunger,gas lift and drainage and gas recovery with pump can be taken after the velocity string is difficult to carry liquid.It provides reference for the optimization of drainage gas recovery technology in the middle and late stage of shale gas wells.